CN212914070U - Flushing syringe - Google Patents

Abstract

The invention provides a flushing injector, which comprises a columnar container, wherein flushing liquid is pre-filled in the columnar container, an injection port for injecting the flushing liquid is arranged on the columnar container, at least part of the container wall of the columnar container is a flexible wall capable of being folded, one part of the columnar container is pushed by hands to enable the flexible container wall to be accommodated in the inner cavity of the other part of the container or to be coated on the outer side of the container wall of the other part of the container, or one part of the columnar container is pushed by hands to enable the flexible container wall to be accommodated in the inner cavity of the one part of the container or to be coated on the outer side of the container wall of the one part of the container, so that the volume of the inner cavity of the container is changed, and then the liquid in the inner cavity of the container is injected to complete catheter flushing, the flushing injector is simple in operation and low in, and the pollution problem that the flushing liquid and the flushing liquid are not easy to leak in a sealed way can not occur, and the residual quantity of the flushing liquid in the inner cavity of the container can be reduced.

Description

Flushing syringe

Technical Field

The utility model provides a flushing injector, which mainly relates to a flushing injector for flushing a catheter.

Background

The vein catheterization can reduce the pain of the patient caused by repeated venipuncture and the fear of the puncture, reduce the anxiety of the patient, facilitate clinical medication, help the critical patient to rescue the patient, reduce the workload of nurses and reduce the pain of the patient, so the vein catheterization is widely applied in clinic. In the using period of the vein catheterization, the probability of catheter blockage is high, wherein the catheter blockage is mainly caused by thrombus, the function of the placed catheter is lost due to serious catheter blockage, and the catheter has to be pulled out in advance, so that the labor intensity of medical personnel is increased, and extra pain and economic burden are caused to a patient. At present, the flushing pipe is clinically needed before and after each transfusion, after the high-viscosity flushing liquid is infused, between two flushing liquids with incompatibility and during the periodical maintenance of the intermittent transfusion period. The most common catheter flushing is a common syringe which comprises a syringe barrel, an injection needle, a piston rod and a rubber piston, wherein flushing liquid is pre-filled in the syringe barrel, the end part of the piston rod is fixedly provided with the rubber piston, and the piston rod pushes the rubber piston to freely slide in the syringe barrel. When the common syringe is applied to catheter flushing, a plurality of defects exist: 1. when the piston rod pushes the rubber piston to the bottom of the injection tube, blood flows back into the cavity of the catheter due to the rebound of the rubber piston, and the catheter is blocked; 2. the rubber piston is extruded by the inner wall of the injection tube for a long time, and the rubber piston can generate elastic fatigue, so that the sealing property between the rubber piston and the inner wall of the injection tube is reduced, and the problems of leakage of flushing liquid and pollution of the flushing liquid exist; 3. the common injector has complex integral structure, more parts, higher manufacturing cost and inconvenient operation, and can bring larger economic burden to patients.

Therefore, there is a need for a flush syringe that is simple in structure, easy to operate, inexpensive to manufacture, and reliable in use.

Disclosure of Invention

The utility model provides a flushing injector with simple structure, convenient operation, lower cost and reliable use.

The utility model provides a flushing injector, including the column container, it has the flush fluid to fill in advance in the column container, be provided with the injection port that supplies the flush fluid injection on the column container, the flexible wall of at least part for can rolling over the book of the container wall of column container.

Preferably, the injection port is disposed at one end of the cylindrical container or at a sidewall of the cylindrical container.

Preferably, the injection port is arranged at one end of the cylindrical container, and the cylindrical container is cylindrical; or the injection port is arranged at one end of the columnar container, the columnar container is in a round table shape, and the diameter of the columnar container is gradually increased or gradually reduced from one end far away from the injection port to one end close to the injection port.

Preferably, the injection port is arranged on the side wall of the cylindrical container, and the cylindrical container is cylindrical; or the injection port is arranged on the side wall of the columnar container, and the diameter of the columnar container is gradually increased or reduced from the position of the injection port to the two ends of the columnar container.

Preferably, the injection port is arranged at one end of the columnar container, and the columnar container is prismatic; or the injection port is arranged at one end of the columnar container, the columnar container is in a prismoid shape, and the diameter of the columnar container is gradually increased or gradually reduced from one end far away from the injection port to one end close to the injection port.

Preferably, the injection port is arranged at one end of the columnar container, and the columnar container is a stepped cylinder; the cylindrical container is provided with a front part close to the injection port, a rear part far away from the injection port and a transition part connecting the front part and the rear part, the diameter of the front part is different from that of the rear part, at least part of the front container wall of the front part and/or the rear container wall of the rear part is a flexible wall capable of being folded, and the transition part is used for assisting the front container wall of the front part and/or the rear container wall of the rear part to be folded.

Preferably, the rear container wall of the rear portion is of a different wall thickness than the front container wall of the front portion.

Preferably, the front part outer wall and/or the rear part outer wall are/is provided with a plurality of reinforcing ribs extending along the axial direction of the cylindrical container, and the plurality of reinforcing ribs are uniformly distributed on the front part outer wall and/or the rear part outer wall.

Preferably, the wall thickness of the transition container wall of the transition portion is smaller than the wall thickness of the front container wall of the front portion of the cylindrical container; or the wall thickness of the transition container wall of the transition part is smaller than that of the rear container wall of the rear part of the columnar container; alternatively, the wall thickness of the transition container wall of the transition portion is less than both the wall thickness of the front container wall of the front portion and the wall thickness of the rear container wall of the rear portion.

Preferably, the transition portion has at least one turn of outwardly bulging portion, the wall thickness of the transition container wall of the bulging portion being smaller than both the wall thickness of the front container wall of the front portion and the wall thickness of the rear container wall of the rear portion.

Preferably, the diameter of the rear part is smaller than that of the front part, and the distance from the inner wall of the front part to the outer wall of the rear part along the radial direction of the cylindrical container is not smaller than the wall thickness of the foldable flexible wall; or the diameter of the front part is smaller than that of the rear part, and the distance from the inner wall of the rear part to the outer wall of the front part along the radial direction of the cylindrical container is not smaller than the wall thickness of the foldable flexible wall.

Preferably, the cylindrical container has a section of middle portion located between the front portion and the rear portion, the diameter of the front portion is different from the diameter of the middle portion, the diameter of the middle portion is different from the diameter of the rear portion, and both ends of the middle portion are respectively connected with the front portion and the rear portion through the transition portion.

Preferably, the intermediate container wall of the intermediate portion is at least partially the flexible wall that can be folded over; and/or the wall thickness of the front container wall of the front part is different from that of the middle container wall of the middle part, and the wall thickness of the middle container wall of the middle part is different from that of the rear container wall of the rear part.

Preferably, the diameter of the front portion, the diameter of the middle portion and the diameter of the rear portion decrease in sequence; or the diameter of the front portion, the diameter of the middle portion and the diameter of the rear portion increase in sequence; or, the diameter of the front portion and the diameter of the rear portion are both smaller than the diameter of the middle portion; alternatively, the diameter of the front portion and the diameter of the rear portion are both greater than the diameter of the middle portion.

Preferably, the diameter of the front part and the diameter of the middle part are set so that the foldable flexible wall can be accommodated between the front part and the middle part in the radial direction of the cylindrical container after being folded, and the diameter of the rear part and the diameter of the middle part are set so that the foldable flexible wall can be accommodated between the rear part and the middle part in the radial direction of the cylindrical container after being folded.

Preferably, the cylindrical container has a plurality of sections of intermediate portions between the front portion and the rear portion, the plurality of sections of intermediate portions being connected to each other by the transition portion, the front portion being connected to the adjacent intermediate portion by the transition portion, and the rear portion being connected to the adjacent intermediate portion by the transition portion.

Preferably, the intermediate portion is divided into a first intermediate portion adjacent to the front portion and a second intermediate portion adjacent to the rear portion, the diameter of the first intermediate portion is different from the diameter of the second intermediate portion, and at least part of the container wall of the first intermediate portion and/or the container wall of the second intermediate portion is the flexible wall capable of being folded; or the middle part is divided into a first middle part close to the front part, a second middle part close to the rear part and a third middle part positioned between the first middle part and the second middle part, the diameter of the first middle part is different from that of the third middle part, the diameter of the second middle part is different from that of the third middle part, at least part of the container walls of the first middle part and the second middle part is the flexible wall capable of being folded, or at least part of the third middle part is the flexible wall capable of being folded.

Preferably, the diameters of the first intermediate portion and the second intermediate portion are set so that the foldable flexible wall can be accommodated between the first intermediate portion and the second intermediate portion in the radial direction of the cylindrical container after being folded; or the diameters of the first middle part and the third middle part are set to enable the foldable flexible wall to be accommodated between the first middle part and the third middle part in the radial direction of the cylindrical container after being folded, and the diameters of the second middle part and the third middle part are set to enable the foldable flexible wall to be accommodated between the second middle part and the third middle part in the radial direction of the cylindrical container after being folded.

Preferably, a sealing cover connected with the positive pressure joint is fixed on the outer side of the injection port, and an internal thread screwed with the positive pressure joint is arranged on the inner wall of the sealing cover.

Preferably, a pin extending towards the direction of the injection port is arranged on the inner wall of the rear part opposite to the injection port, and the pin is connected with the injection port in an inserting manner; or a pin extending towards the direction of the injection port is arranged on the inner wall of the rear part opposite to the injection port, the inner peripheral wall of the injection port extends towards the pin to form a pin hole, and the pin is connected with the pin hole in an inserted manner; or a one-way valve for controlling the one-way flow of the flushing liquid from the columnar container to the injection port is arranged on the inner side of the injection port.

Preferably, an acting part extending outwards is fixed on the outer side of the injection port, the acting part conforms to the shape of a human hand and is used for assisting the hand to apply force to push the cylindrical container far away from one end of the injection port, so that the foldable flexible wall is folded and the flushing liquid is pushed to be injected through the injection port.

Preferably, the outer side of the rear part is provided with a pushing part, and the pushing part is covered on the outer side of the rear part in a form-fitting manner.

Preferably, the device further comprises a sealing component, wherein the sealing component is used for sealing the injection port and preventing flushing liquid in the columnar container from flowing out to the outside from the injection port.

Preferably, the transition portion is provided with a pre-fold.

Advantageous effects

First, the utility model discloses well cylindrical container's container wall is the flexible wall that can turn over at least partly, and the partly flexible container wall of this part of messenger that uses the hand to push cylindrical container holds in the container inner chamber of another part or the cladding in the outside of the container wall of another part, perhaps makes the flexible container wall of another part hold in the outside of this part's container inner chamber or cladding in this part's container wall with the partly flexible container wall of hand promotion cylindrical container to change the volume of container inner chamber, and then inject the flush fluid of container inner chamber and accomplish the pipe and wash. The flushing injector is integrally formed, has few parts, extremely simple structure and sealing, is easy to operate, simple in assembly process and low in manufacturing cost, and is easy to realize batch production; simultaneously the utility model discloses a can not appear rolling over a part resilience in the washing syringe use, lead to blood backward flow to go into the pipe intracavity, the pipe jam appears to and can not appear sealed not good pollution problem who reveals flush fluid and flush fluid, can also reduce the volume of remaining of container inner chamber flush fluid.

Secondly, the flushing injector of the utility model has various forms, the injection port can be arranged at one end of the columnar container, and flushing can be realized by pushing the other end; or the injection port is arranged on the side wall of the approximate middle part of the columnar container, and the flushing liquid flows to the middle part of the columnar container to realize injection by pushing the two ends, so that the injection device is convenient to use and high in practicability.

Third, the cylindrical container of the syringe of the present invention can be designed flexibly according to specific requirements, and can be in various specific shapes, such as a cylinder, a circular truncated cone, a prism, a truncated pyramid, a step-shaped cylinder, or a multi-step-shaped cylinder. Fourth, the utility model discloses a when washing the column container of syringe sets up to two-stage or multistage step form cylinder, the wall thickness through the flexible wall that will turn over a part sets up to be thinner than the wall thickness of a non-section of turning over for the container wall turn over a book more easily, and can prevent that the non-container wall that turns over a part from the deformation under the exogenic action, improved this application and washed the use reliability of syringe.

Fifth, the utility model discloses a when the column container of washing syringe sets up to two-stage or more multistage step form cylinder, the setting of the diameter size of the column container of adjacent each part satisfies to turn over a partial back and hold between the container wall of adjacent two-stage cylinder container of rolling over, can reduce the volume of remaining of container inner chamber flush fluid through the setting of multilevel structure.

Sixth, the utility model discloses well transition part is used for supplementary preceding part, rear portion or mid portion to accomplish to turn over a book, and the transition part wall thickness is less than the wall thickness of the other parts of container, and the thinner transition part of wall thickness turns over a book more easily, and consequently the setting of transition part has reduced the originated resistance of turning over a book of preceding part, rear portion and mid portion, and then has reduced the flexible container wall that the hand promoted the column container and has taken place to turn over a resistance.

Seventh, the utility model discloses well transition part is provided with turns over a portion in advance, can guarantee to wash the reliability and the smooth and easy nature of start.

Eighth, the middle columnar container of the present invention is provided with the axial reinforcing rib on the outer wall of the rear portion, and the reinforcing rib enhances the local strength of the rear portion in the axial direction, thereby avoiding the inconvenience of the medical staff caused by the need to extend the hand into the recess to push the rear portion when the hand pushes the rear portion in the axial direction of the columnar container; or the columnar container is provided with the axial reinforcing rib on the outer wall of the front part, and the reinforcing rib enhances the local strength of the front part in the axial direction, so that the front part is prevented from being extruded and deformed due to insufficient strength when pushing the middle part or the rear part to turn over along the axial direction of the columnar container; or the front part and the rear part of the columnar container are both provided with axial reinforcing ribs, so that the strength of the front part and the strength of the rear part can be enhanced simultaneously, and the front part and the rear part are guaranteed not to deform under the action of external force and to be turned reliably.

Ninth, the middle-rear part of the utility model is provided with a pin against the inner wall of the injection port, and the pin is connected with the injection port in an inserting way; or the rear part is provided with a pin against the inner wall of the injection port, and the inner side of the injection port is provided with a pin hole, and the pin is connected with the pin hole in an inserting way; or the one-way valve is arranged on the inner side of the injection port, so that the situation that the folded part of the cylindrical container rebounds to cause the blood to flow back into the catheter can be prevented.

Drawings

FIG. 1: the sectional structure of the first embodiment of the flushing syringe of the utility model is shown in the schematic diagram 1;

FIG. 2: the sectional structure of the first embodiment of the flushing syringe of the utility model is schematically shown in figure 2;

FIG. 3: the sectional structure of the first embodiment of the flushing syringe of the utility model is schematically shown in figure 3;

FIG. 4: the utility model discloses a cross-sectional structure schematic diagram of a second embodiment of the flushing injector 1;

FIG. 5: the sectional structure of the second embodiment of the flushing syringe of the utility model is schematically shown in figure 2;

FIG. 6: the structure of the second embodiment of the flushing syringe of the utility model is schematically shown;

FIG. 7: the utility model discloses a sectional structure diagram of a third embodiment of the flushing injector;

FIG. 8: the cross-sectional structure of the fourth embodiment of the flushing syringe of the utility model is shown in the schematic diagram 1;

FIG. 9: the utility model discloses a cross-sectional structure diagram of a fifth embodiment of the flushing injector;

FIG. 10: the cross-sectional structure of the fourth embodiment of the flushing syringe of the utility model is shown in the schematic diagram 2;

FIG. 11: the structure of the fifth embodiment of the flushing injector of the utility model is schematically shown;

FIG. 12: the structure of the sixth embodiment of the flushing syringe of the utility model is shown in the schematic diagram 1;

FIG. 13: the utility model discloses a washing injector with a seventh embodiment, which is a sectional structure schematic diagram;

FIG. 14: the sectional structure of the sixth embodiment of the flushing syringe of the utility model is shown in the schematic diagram 2;

FIG. 15: the structure of the eighth embodiment of the flushing syringe of the utility model is shown in the schematic diagram 1;

FIG. 16: the utility model discloses a cross-sectional structure diagram of a ninth embodiment of the flushing injector;

FIG. 17: the utility model discloses a cross-sectional structure schematic diagram of an eighth embodiment of the flushing injector 2;

FIG. 18: the structure of the tenth embodiment of the flushing syringe of the utility model is schematically shown in figure 1;

FIG. 19: the cross-sectional structure of the tenth embodiment of the flushing syringe of the utility model is schematically shown in figure 2;

FIG. 20: the structure of the eleventh embodiment of the flushing syringe of the utility model is schematically shown in figure 1;

FIG. 21: the cross-sectional structure of the eleventh embodiment of the flushing syringe of the utility model is schematically shown in figure 2;

FIG. 22: the structure of the twelfth embodiment of the flushing syringe of the utility model is schematically shown;

FIG. 23: the utility model discloses a cross-sectional structure diagram of a thirteenth embodiment of the flushing injector;

FIG. 24: the structure of the fourteenth embodiment of the flushing syringe of the utility model is schematically shown;

FIG. 25: the fifteenth embodiment of the flushing syringe of the utility model has a sectional structure.

1. A cylindrical container; 10. an injection port; 101. a pin hole; 102. a force application member; 11. a front portion; 12. a rear portion; 121. axial reinforcing ribs; 122. a pin; 13. a transition portion; 131. a bulge portion; 14. a container inner cavity; 15. a container wall; 151. a front container wall; 152. a rear container wall; 153. a transition vessel wall; 16. a middle portion; 161. a first intermediate portion; 162. a second intermediate portion; 163. a third intermediate portion; 164. an intermediate container wall; 2. sealing the cover; 21. a thread; 3. a pushing member; 4. spacing; 5. a distance; 6. a seal ring; 7. a one-way valve;

71. a compression spring; 72. a valve seat; 721. a liquid inlet; 722. a liquid outlet; 73. a valve core; 74. a gap; 75. a base body; 751. an outlet; 76. a valve plate; 8. and a sealing member.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the claims.

The utility model provides a flushing injector, and the first embodiment of the flushing injector provided by the utility model is introduced below.

As shown in fig. 1, the flush syringe includes a hollow columnar container 1, the columnar container 1 has a columnar shape or a prismatic shape, the shape of the columnar container 1 is not limited thereto, and other shapes may be adopted, the columnar container 1 has a container wall 15, and at least a part of the container wall 15 is a flexible wall made of a foldable flexible material. The flexible wall is a wall which can be deformed to realize folding under the action of external force. Preferably, the container wall 15 is made of medical grade polyvinyl chloride. An injection port 10 is formed in a container wall 15, the injection port 10 is located at one end of the columnar container 1, the injection port 10 is communicated with a positive pressure connector of the indwelling needle, a cavity defined by the container wall 15 is a container inner cavity 14, and a flushing liquid for flushing the indwelling needle catheter is pre-injected into the container inner cavity 14. The container wall 15 at the end far away from the injection port 10 is pushed by hand towards the direction of the injection port 10 to be folded inwards and accommodated in the container inner cavity 14 at the end close to the injection port 10, so that the volume of the container inner cavity 14 is changed, and then the flushing liquid in the container inner cavity 14 is pushed to complete the catheter flushing. The device can also be used to flush the catheter in a pulsed manner by pushing the container wall 15 away from the injection port 10 in a stop-and-go fashion. The device integrated into one piece, simple structure, and airtight, not only easy operation, manufacturing cost is lower, can not appear finishing the part of rolling over moreover and kick-backing, leads to blood to flow back into the pipe intracavity, the pipe jam appears to and can not appear sealed not well reveal the pollution problem of flush fluid and flush fluid, still reduce the 14 flush fluid residues in container inner chamber.

In addition, the structure can also be arranged in a way that the container wall 15 at one end far away from the injection port 10 is pushed towards the direction of the injection port 10 by hand, and the container wall of the folded part is folded and then covers the outer wall of the part which is not folded, so that the volume of the inner cavity 14 of the container is changed, and then the flushing liquid in the inner cavity 14 of the container is pushed to finish the catheter flushing.

Because the inner diameters of the inner cavities 14 of the containers are the same, before the container wall 15 at the end far away from the injection port 10 is folded, the resistance of the container wall 15 at the end close to the injection port 10 needs to be overcome, and the container wall can be folded inwards and contained in the inner cavity 14 of the container at the end close to the injection port 10, or can be folded outwards and coated on the outer wall of the container wall 15 at the end close to the injection port 10. As shown in fig. 3, in order to reduce the above resistance, the cylindrical container 1 is in a truncated cone shape or a truncated pyramid shape, the shape of the cylindrical container 1 is not limited thereto, and other shapes may be adopted, the diameter of the cylindrical container 1 is gradually increased from one end far away from the injection port 10 to one end close to the injection port 10, and the folded part is located in the inner cavity of the unfolded part after being folded; or the diameter of the columnar container 1 is gradually reduced from one end far away from the injection port 10 to one end close to the injection port 10, and the folded part is covered on the outer wall of the unfolded part after being folded. Preferably, the distance 5 from the inner wall of the largest diameter of the cylindrical container 1 to the outer wall of the smallest diameter of the cylindrical container 1 in the radial direction of the cylindrical container 1 is not less than the wall thickness of the flexible wall which can be folded. The above arrangement ensures that there is sufficient clearance between the inner wall of the maximum diameter and the outer wall of the minimum diameter of the cylindrical container 1 for accommodating the folded portion of the flexible wall which can be folded.

As shown in fig. 3, a check valve 7 is disposed inside the injection port 10, and specifically, the check valve 7 includes a seat body 75 and a valve sheet 76, the seat body 75 is made of medical plastic material, the seat body 75 is provided with an outlet 751 for allowing the flushing liquid to flow out to the outside, the valve sheet 76 is made of medical elastic material, the valve sheet 76 is arranged on the outer side of the seat body 75, the flexible container wall 15 of the columnar container 1 is pushed by hands, the valve sheet 76 is pushed by flushing fluid in the inner cavity 14 of the container to bend towards the injection port 10, thereby allowing the flushing liquid in the inner cavity 14 of the container to flow out from the outlet 751 to the outside, stopping pushing the flexible container wall 15 of the cylindrical container 1 by hand, the valve sheet 76 is elastically restored by itself and closes the outlet 751 of the seat body 75, thus preventing the flushing fluid flowing out to the outside from flowing back into the container lumen 14, and thus preventing blood from flowing back into the catheter lumen, resulting in catheter blockage.

As shown in fig. 2, preferably, the injection port 10 may also be located on the side wall of the cylindrical container 1, and both ends of the cylindrical container 1 are pushed by hand towards the injection port 10 to be folded inwards and accommodated in the container cavity 14 near the middle position of the cylindrical container 1, or both ends of the cylindrical container 1 are pushed by hand towards the injection port 10 to be folded outwards and to be wrapped on the outer wall of the container near the middle position of the cylindrical container 1. The two ends of the columnar container 1 are pushed by hands, so that the ergonomic arrangement is better met, and the columnar container 1 is more favorably pushed by the force applied by the hands.

Preferably, since the inner diameters of the container inner cavities 14 are the same, before the container walls 15 far away from the two ends of the injection port 10 are folded, the resistance of the container walls 15 near the middle position of the columnar container 1 needs to be overcome, so that the container walls can be folded inwards and accommodated in the container inner cavity 14 near the middle position of the columnar container 1, or the container walls can be folded outwards and covered on the outer walls of the container walls 15 near the middle position of the columnar container 1. In order to reduce the resistance, the diameter of the columnar container 1 is gradually increased from the position of the injection port 10 to the two ends of the columnar container 1, and the folded part is covered on the outer wall of the unfolded part after being folded; or the diameter of the columnar container 1 is gradually reduced from the position of the injection port 10 to the two ends of the columnar container 1, and the folded part is positioned in the inner cavity of the unfolded part after being folded.

Referring to fig. 4 to 6, the second embodiment of the flush syringe provided by the present invention has substantially the same structure as the first embodiment, and the difference therebetween is that: as shown in fig. 4 and 5, the injection port 10 is disposed at one end of the cylindrical container 1, the cylindrical container 1 is a stepped cylinder, the cylindrical container 1 has a front portion 11 near one end of the injection port 10, a rear portion 12 far from one end of the injection port 10, and a transition portion 13 connecting the front portion 11 and the rear portion 12. The front portion 11 has a diameter greater than the diameter of the rear portion 12. The front part 11 is made of medical plastic materials, and the rear part 12 and the transition part 13 are made of flexible materials which can be turned over. Preferably, the rear portion 12 and the transition portion 13 are made of medical polyethylene. The front portion 11, the rear portion 12 and the transition portion 13 are bonded together by a medical adhesive. When the rear part 12 is pushed by hand towards the injection port 10, the front part 11 pushes the container wall 15 of the rear part 12 close to one end of the injection port 10 to be folded outwards and accommodated in the container cavity 14 of the front part 11, so that the volume of the container cavity 14 is changed, and the flushing liquid injected into the container cavity 14 completes the catheter flushing.

As shown in fig. 4, the wall thickness of the transition container wall 153 of the transition portion 13 is smaller than that of the rear container wall 152 of the rear portion 12, and the transition portion 13 with a thinner wall thickness is easier to fold, which effectively reduces the resistance of the front portion 11 to push the rear portion 12 back to start folding. Preferably, the transition portion 13 is provided with a pre-folded portion, the pre-folded portion is folded outwards and is accommodated in the container cavity 14 at the end of the front portion 11 far away from the injection port 10, and the arrangement effectively reduces the resistance of the rear portion container wall 152 at the end of the rear portion 12 close to the injection port 10 to start folding, so as to ensure that the rear portion 12 starts to be folded from the rear portion container wall 152 at the end close to the injection port 10, and further ensure the reliability and the smoothness of the flushing start.

As shown in fig. 6, the outer wall of the rear portion 12 is provided with a plurality of axial ribs 121, and the plurality of axial ribs 121 are uniformly distributed on the outer side of the rear portion 12. The reinforcing rib 121 enhances the local strength of the rear part 12 in the axial direction, so that the problem that when the hand pushes the rear part 12 in the axial direction of the cylindrical container 1, the rear part 12 is depressed inwards by the hand action area, and the medical staff needs to stretch the hand into the depression to push the rear part 12, which causes inconvenience in operation is avoided.

As shown in fig. 4, the front portion 11 has a smaller axial length than the rear portion 12. Preferably, the axial length of the rear part 12 is at least 2 times of the axial length of the front part 11, and the arrangement ensures that the rear part 12 has enough length to be folded and accommodated in the container cavity 14 of the front part 11, so that the volume of the container cavity 14 after injection is effectively reduced, and the residual quantity of flushing liquid in the container cavity 14 is effectively reduced.

As shown in fig. 4, the distance 4 from the inner wall of the front part 11 to the outer wall of the rear part 12 in the radial direction of the cylindrical container 1 is not smaller than the wall thickness of the folded part of the rear part 12, and this arrangement ensures that there is sufficient clearance between the inner wall of the front part 11 and the outer wall of the rear part 12 for accommodating the folded part of the rear part 12.

As shown in fig. 4, the device further comprises a sealing part 8, wherein the sealing part 8 is in a cover body shape and is made of medical plastic materials, the sealing part 8 is connected with the injection port 10 in an inserting mode, the inner side wall of the sealing part 8 is sealed in interference fit with the outer side wall of the injection port 10, and therefore pre-filled flushing liquid in the cylindrical container 1 is prevented from flowing out to the outside through the injection port 10, and therefore the fact that the pre-filled flushing liquid of the flushing syringe does not leak before use is guaranteed.

As shown in fig. 4, a check valve 7 is disposed inside the injection port 10, specifically, the check valve 7 includes a compression spring 71, a valve seat 72 and a valve core 73, the valve seat 72 is cylindrical and hollow inside and is made of medical plastic material, the valve seat 72 is limited inside the injection port 10, two ends of the valve seat 72 are respectively provided with a liquid inlet 721 and a liquid outlet 722, the liquid inlet 721 is communicated with the liquid outlet 722 through an internal middle cavity of the valve seat 72, the valve core 73 is made of medical rubber material, the valve core 73 is disposed inside and hollow along an axial direction of the valve seat 72, the valve core 73 is a piston rod type valve core, the compression spring 71 surrounds a valve rod of the valve core 73, one end of the compression spring 71 is abutted to the liquid inlet 721 end of the valve seat 72, and the other end is abutted to a valve plug end of the valve core 73. When the flexible container wall 15 of the cylindrical container 1 is pushed by hand, the valve core 73 is pushed by the flushing liquid in the container cavity 14 to move towards the liquid outlet 722, so that the flushing liquid in the container cavity 14 is allowed to flow out from the liquid outlet 722 through the inner hollow of the valve seat 72 through the liquid inlet 721, when the flexible container wall 15 of the cylindrical container 1 is stopped being pushed by hand, the valve plug of the valve core 73 is pressed by the compression spring 71 to be linearly sealed with the liquid inlet 721 of the valve seat 72, so that the flushing liquid flowing out to the outside is prevented from flowing back to the container cavity 14 from the liquid inlet 721 through the inner hollow of the valve seat 72 from the liquid outlet 722, and therefore blood is prevented from flowing back to the catheter cavity.

Preferably, as shown in fig. 5, in order to effectively prevent the folded part of the rear part 12, which is folded outwards and accommodated in the container cavity 14 of the front part 11, from rebounding, resulting in the backflow of blood into the catheter, the inner wall of the rear part 12 facing the injection port 10 may be further provided with a pin 122, and the pin 122 is connected with the injection port 10 in a plugging manner. In order to facilitate the mold processing and manufacturing of the product, the pin 122 is formed separately from the rear portion 12, the pin 122 is made of a medical plastic material, the rear portion 12 is provided with a through hole for allowing the pin 122 to pass through, and the pin 122 is sealed in an interference fit with the through hole through a sealing ring 6. The pin 122 is conical, and the conical pin 122 can be more precisely positioned and firmly inserted into the injection port 10.

As shown in fig. 5, a sealing cover 2 is arranged outside the injection port 10, the sealing cover 2 is made of medical plastic and is fixed outside the injection port 10, the sealing cover 2 is provided with a thread 21 screwed with the positive pressure joint, and the arrangement further strengthens the firmness of the connection between the injection port 10 and the positive pressure joint. And a force application part 102 extending outwards is arranged on the outer side of the injection port 1, the force application part 102 and the sealing cover 2 are integrally formed, and the force application part 102 is used for assisting a hand to apply force to push the container wall 15 far away from one end of the injection port 10, so that the foldable container wall 15 is folded, and flushing liquid is pushed to be injected through the injection port 10.

As shown in fig. 5, in order to enhance the connection firmness between the sealing member 8 and the cylindrical container 1, the sealing member 8 is in a cover body shape, the sealing member 8 is in threaded connection with the cover 2, the sealing member 8 is sealed with the end face of the injection port 10, and further the pre-filled flushing liquid in the cylindrical container 1 is prevented from flowing out from the injection port 10, so that the pre-filled flushing liquid of the flushing syringe is ensured to have no leakage before use. Fig. 5 is only a schematic view, and the sealing member 8 needs to be removed from the cap 2 during the injection of the washing liquid.

Preferably, the front container wall 151 of the front portion 11 at the end far from the injection port 10 is made of a foldable flexible material, the rear container wall 152 of the rear portion 12 is made of a foldable flexible material, the rear portion 12 is pushed towards the injection port 10 by hand, the front portion 11 reversely pushes the rear container wall 152 of the rear portion 12 at the end near the injection port 10 to be folded outwards and accommodated in the container cavity 14 of the front portion 11 at the end far from the injection port 10, the rear portion 12 is continuously pushed towards the injection port 10, and the rear portion 12 pushes the front container wall 151 of the front portion 11 at the end far from the injection port 10 to be folded inwards and accommodated in the container cavity 14 of the front portion 11 at the end near the injection port 10. The container wall 15 capable of being folded through a plurality of parts of the cylindrical container 1 is folded, so that the volume of the inner cavity 14 of the container after injection is effectively reduced, and the residual quantity of flushing liquid in the inner cavity 14 of the container is further reduced.

Preferably, in order to facilitate the processing and production of the cylindrical container 1, the cylindrical container 1 is bonded by the same material more conveniently and firmly, so that the front part 11, the rear part 12 and the transition part 13 are made of flexible materials which can be folded. The wall thickness of the rear section 12 is smaller than the wall thickness of the front section 11, so that the rear section 12 is pushed over more easily with respect to the front section 11. Preferably, the wall thickness of the transition container wall 153 of the transition portion 13 is smaller than the wall thickness of the front container wall 151 of the front portion 11 and the wall thickness of the rear container wall 152 of the rear portion 12, and the transition portion 13 with a thinner wall thickness is easier to fold, which effectively reduces the resistance of the front portion 11 to push the rear portion 12 to start folding. The outer wall of the front part 11 is provided with a plurality of axial reinforcing ribs 121, the plurality of axial reinforcing ribs 121 are uniformly distributed on the outer side of the front part 11, the reinforcing ribs 121 enhance the local strength of the front part 11 in the axial direction, and the phenomenon that the front part 11 is not sufficiently extruded and deformed due to insufficient strength when pushing the rear part 12 to be turned over along the axial direction of the columnar container 1 is avoided.

Preferably, the outer wall of the front part 11 and the outer wall of the rear part 12 are both provided with axial reinforcing ribs 121, so that the front part 11 and the rear part 12 are ensured not to deform under the action of external force and to be reliably turned over.

Referring to fig. 7, in order to avoid deformation of the front part 11 when the rear part 12 pushes the front part 11, the front part 11 is preferably made of a flexible material that can be folded and folded, and the rear part 12 is preferably made of a medical plastic material. Preferably, in order to realize efficient mass production of the cylindrical container 1, the front portion 11, the rear portion 12 and the transition portion 13 may be integrally blow-molded, and specifically, the front portion 11, the rear portion 12 and the transition portion 13 are made of foldable flexible materials, and the wall thickness of the front portion 11 is smaller than that of the rear portion 12 through a blow molding process, so that the front portion 11 is more easily pushed to be folded relative to the rear portion 12. When the rear portion 12 is pushed by hand towards the injection port 10, the rear portion 12 pushes the front portion 11 to be folded inwards from the front container wall 151 at the end away from the injection port 10 and to be accommodated in the container cavity 14 at the end of the front portion 11 close to the injection port 10, so as to change the volume of the container cavity 14, and further push the container cavity 14 with flushing liquid to complete catheter flushing.

The wall thickness of the transition container wall 153 of the transition part 13 is smaller than that of the front container wall 151 of the front part 11, the transition part 13 with the thinner wall thickness is easier to turn over, and the resistance of the rear part 12 to push the front part 11 to start turning over is effectively reduced. The transition part 13 is provided with a pre-turning part which turns inwards and is accommodated in the container cavity 14 at the end of the front part 11 far away from the injection port 10, and the arrangement effectively reduces the resistance of the front container wall 151 at the end of the front part 11 far away from the injection port 10 to turn over at the beginning, so that the front part 11 is turned over from the front container wall 151 at the end far away from the injection port 10, and the reliability and the smoothness of the starting of washing are further ensured.

Preferably, the distance 4 from the inner wall of the front part 11 to the outer wall of the rear part 12 along the radial direction of the cylindrical container 1 is not less than the wall thickness of the folded part of the front part 11, and the arrangement ensures that there is enough clearance between the inner wall of the front part 11 and the outer wall of the rear part 12 for accommodating the folded part of the front part 11.

The front portion 11 has an axial length greater than the axial length of the rear portion 12. Preferably, the axial length of the front part 11 is at least 2 times of the axial length of the rear part 12, and the arrangement ensures that the front part 11 has enough length to be pushed by the rear part 12 for turning over, so that the volume of the inner cavity 14 of the container after injection is effectively reduced, and the residual quantity of flushing liquid in the inner cavity 14 of the container is effectively reduced.

Preferably, the front container wall 151 of the front portion 11 is made of a foldable flexible material, the rear container wall 152 of the rear portion 12 at the end close to the injection port 10 is made of a foldable flexible material, the rear portion 12 is pushed toward the injection port 10 by hand, the rear portion 12 pushes the front container wall 151 of the front portion 11 at the end far from the injection port 10 to fold inward and is accommodated in the container cavity 14 of the front portion 11 at the end close to the injection port 10, the rear portion 12 is pushed to the injection port 10 continuously, and the front portion 11 pushes the rear container wall 152 of the rear portion 12 at the end close to the injection port 10 to fold outward and is accommodated in the container cavity 14 of the front portion 11 at the end close to the injection port 10 reversely. The container wall 15 that can turn over through a plurality of parts of cylindrical container 1 turns over, has effectively reduced the volume of container inner chamber 14 after the injection, and then has reduced container inner chamber 14 flush fluid residual amount.

As shown in fig. 7, a check valve 7 is arranged inside the injection port 10, specifically, the check valve 7 is duckbilled and made of elastic material, the check valve 7 is provided with a gap 74 allowing the flushing liquid to flow out to the outside, when the flexible container wall 15 of the cylindrical container 1 is pushed by a hand, the gap 74 of the check valve 7 is pushed by the flushing liquid in the container inner cavity 14 to be gradually increased, so that the flushing liquid in the container inner cavity 14 is allowed to flow out to the outside through the gap 74 of the check valve 7, when the flexible container wall 15 of the cylindrical container 1 is stopped to be pushed by the hand, the gap 74 of the check valve 7 is folded by the elastic action of itself, so that the flushing liquid flowing out to the outside is prevented from flowing back to the container inner cavity 14 from the gap 74, thereby preventing blood from flowing.

As shown in fig. 7, in order to facilitate product processing, assembly and reduce processing cost, the sealing member 8 is a part of the injection port 10, and a flat end enclosure is formed by heat-sealing a port of the injection port 10, so as to prevent the pre-filled flushing liquid in the cylindrical container 1 from flowing out to the outside through the injection port 10.

Referring to fig. 8 and 10, a fourth embodiment of the flush syringe of the present invention is basically the same in construction as the second embodiment except that: as shown in fig. 8 and 10, the diameter of the front portion 11 is smaller than that of the rear portion 12, the rear portion 12 is made of medical plastic, and the front portion 11 and the transition portion 13 are made of flexible materials which can be folded. Preferably, the front portion 11 and the transition portion 13 are made of medical silica gel. When the rear portion 12 is pushed by hand towards the injection port 10, the rear portion 12 pushes the front portion 11 away from the front container wall 151 at the end of the injection port 10 to be folded outwards and accommodated in the container cavity 14 of the rear portion 12, so as to change the volume of the container cavity 14 and further push the flushing liquid in the container cavity 14 to complete the catheter flushing.

The front portion 11 has an axial length greater than the axial length of the rear portion 12. Preferably, the axial length of the front part 11 is at least 2 times of the axial length of the rear part 12, and the arrangement ensures that the front part 11 has enough length to be folded and accommodated in the container inner cavity 14 of the rear part 12, so that the volume of the container inner cavity 14 after injection is effectively reduced, and the residual quantity of flushing liquid in the container inner cavity 14 is effectively reduced.

Preferably, the distance 4 from the inner wall of the rear part 12 to the outer wall of the front part 11 along the radial direction of the cylindrical container 1 is not less than the wall thickness of the folded part of the front part 11, and the arrangement ensures that there is enough clearance between the inner wall of the rear part 12 and the outer wall of the front part 11 for accommodating the folded part of the front part 11.

The wall thickness of the transition container wall 153 of the transition part 13 is smaller than that of the front container wall 151 of the front part 11, the transition part 13 with the thinner wall thickness is easier to turn over, and the resistance of the rear part 12 to push the front part 11 to start turning over is effectively reduced. The transition part 13 is provided with a pre-turning part which turns outwards and is accommodated in the container cavity 14 at the end of the rear part 12 far away from the injection port 10, and the arrangement effectively reduces the resistance of the front container wall 151 at the end of the front part 11 far away from the injection port 10 to turn over at the beginning, thereby ensuring that the front part 11 starts to turn over from the front container wall 151 at the end far away from the injection port 10, and further ensuring the reliability and the smoothness of the washing start.

Preferably, in order to facilitate the processing and production of the cylindrical container 1, the cylindrical container 1 is bonded by the same material more conveniently and firmly, and the front part 11, the rear part 12 and the transition part 13 are made of flexible materials which can be folded. The wall thickness of the front section 11 is smaller than the wall thickness of the rear section 12, so that the front section 11 is more easily pushed over relative to the rear section 12.

Preferably, the front portion 11 is made of a foldable flexible material, the rear container wall 152 at the end of the rear portion 12 close to the injection port 10 is made of a foldable flexible material, the rear portion 12 is pushed toward the injection port 10 by hand, the rear portion 12 pushes the front container wall 151 at the end of the front portion 11 far from the injection port 10 to be folded outwards and accommodated in the container cavity 14 of the rear portion 12, the rear portion 12 is pushed continuously toward the injection port 10, and the rear container wall 152 at the end of the rear portion 12 close to the injection port 10 is pushed by the front portion 11 to be folded inwards and accommodated in the container cavity 14 of the rear portion 12. The container wall 15 which can be folded through a plurality of parts of the columnar container 1 is folded, so that the volume of the inner cavity 14 of the container after injection is effectively reduced, and the residue of flushing liquid in the inner cavity 14 of the container is further reduced.

Referring to fig. 9 and 11, a fifth embodiment of a flush syringe according to the present invention is substantially the same in construction as the fourth embodiment except that: as shown in fig. 9 and 11, in order to avoid the deformation of the front part 11 when pushing the rear part, the front part 11 can also push the rear part 12 reversely to fold, the front part 11 is made of medical plastic, and the rear part 12 and the transition part 13 are made of flexible materials with folding function. Preferably, in order to realize efficient mass production of the cylindrical container 1, the front portion 11, the rear portion 12 and the transition portion 13 may be integrally blow-molded, the front portion 11, the rear portion 12 and the transition portion 13 are made of foldable flexible materials, and the wall thickness of the front portion 11 is larger than that of the rear portion 12 through a blow molding process, so that the rear portion 12 is more easily pushed to be folded relative to the front portion 11. When the rear portion 12 is pushed by hand towards the injection port 10, the front portion 11 pushes the rear portion wall 152 of the rear portion 12 close to the end of the injection port 10 to be folded inwards and accommodated in the container cavity 14 of the rear portion 12 far from the end of the injection port 10, so as to change the volume of the container cavity 14 and further push the container cavity 14 with flushing liquid to complete the catheter flushing.

Preferably, the distance 4 from the inner wall of the rear part 12 to the outer wall of the front part 11 along the radial direction of the cylindrical container 1 is not less than the wall thickness of the folded part of the rear part 12, and the arrangement ensures that there is enough clearance between the inner wall of the rear part 12 and the outer wall of the front part 11 for accommodating the folded part of the rear part 12.

As shown in fig. 9, the transition portion 13 has at least one turn of outwardly bulged bulge 131, and the wall thickness of the bulge 131 is realized by the blow molding process and is smaller than the wall thickness of the front container wall 151 of the front portion 11 and the wall thickness of the rear container wall 152 of the rear portion 12, so that not only is the product function realized, but also the high-efficiency production of the product is ensured. The transition part 13 is provided with a pre-folding part which is folded inwards and is accommodated in the container inner cavity 14 at one end of the rear part 12 close to the injection port 10, and the arrangement effectively reduces the initial folding resistance of the rear part container wall 152 at one end of the rear part 12 close to the injection port 10, so that the rear part 12 is folded from the rear part container wall 152 at one end close to the injection port 10, and the reliability and the smoothness of the washing start are further ensured.

Preferably, the front container wall 151 of the front portion 11 at the end far away from the injection port 10 is made of a foldable flexible material, the rear portion 12 is pushed towards the injection port 10 by hand, the front portion 11 pushes the rear container wall 152 of the rear portion 12 at the end near the injection port 10 to fold inwards and be accommodated in the container cavity 14 of the rear portion 12 at the end far away from the injection port 10, the rear portion 12 is pushed towards the injection port 10 continuously, and the rear portion 12 pushes the front container wall 151 of the front portion 11 at the end far away from the injection port 10 to fold outwards and be accommodated in the container cavity 14 of the rear portion 12. The container wall 15 that can turn over through a plurality of parts of cylindrical container 1 turns over, has effectively reduced the volume of container inner chamber 14 after the injection, and then has reduced container inner chamber 14 flush fluid residual amount.

As shown in fig. 9, in order to achieve a more accurate and rapid insertion of the pin 122, a pin hole 101 is formed in the inner peripheral wall of the injection port 10 extending towards the pin 122, and the pin hole 101 is disposed opposite to the pin 122.

As shown in fig. 9, in order to facilitate pushing the rear portion 12 by hand force and prevent the region of the rear portion 12 acted by the hand from sinking inwards, the region of the rear portion 12 acted by the hand is provided with a pushing component 3, the pushing component 3 is made of medical plastic material, and the pushing component 3 is covered outside the rear portion 12 in a form-fitting manner.

Referring to fig. 12 and 14, a sixth embodiment of a flush syringe according to the present invention is substantially the same as the second embodiment except that: the flush syringe is in the shape of a multi-stage stepped cylinder, specifically, the cylindrical container 1 has a section of a middle portion 16 located between the front portion 11 and the rear portion 12, a middle container wall 164 of the middle portion 16 is made of a flexible material capable of being folded, and two ends of the middle portion 16 are respectively connected with the front portion 11 and the rear portion 12 through the transition portion 13. The diameter of the front section 11, the diameter of the intermediate section 16 and the diameter of the rear section 12 decrease in this order. The front part 11 is made of medical plastic materials, and the rear part 12 and the transition part 13 are made of flexible materials which can be turned over. The front portion 11, the middle portion 16, the rear portion 12 and the transition portion 13 are bonded together by a medical adhesive. The material of the intermediate portion 16 has a hardness less than the hardness of the material of the rear portion 12; alternatively, the intermediate portion 16 has a thickness of the intermediate container wall 164 that is less than the thickness of the rear container wall 152 of the rear portion 12, such that the intermediate portion 16 is readily folded over relative to the rear portion 12. When the rear portion 12 is pushed by hand toward the injection port 10, the rear portion 12 pushes the middle portion 16 away from the middle container wall 164 at the end of the injection port 10 to be folded inward and accommodated in the container cavity 14 at the central position of the middle portion 16, and the rear portion 12 is pushed continuously toward the injection port 10, and the front portion 11 pushes the middle portion 16 back to push the middle container wall 164 at the end of the middle portion 16 close to the injection port 10 to be folded outward and accommodated in the container cavity 14 of the front portion 11, so as to change the volume of the container cavity 14, and further push the container cavity 14 with flushing fluid to complete catheter flushing. The flexible container wall 15 is turned over through the syllogic through the aforesaid setting, has effectively reduced the volume of injection back container inner chamber 14 to change the volume of container inner chamber 14, and then reduced container inner chamber 14 flush fluid residual quantity.

As shown in fig. 12, the axial length of the intermediate portion 16 is greater than the axial length of the front and rear portions 11, 12. Preferably, the axial length of the intermediate portion 16 is at least 2 times the axial length of the front and rear portions 11, 12. The above arrangement ensures that the intermediate portion 16 has sufficient length to be pushed by the rear portion 12 for the turnover, and ensures that the intermediate portion 16 has sufficient length to be turned over and accommodated in the container cavity 14 of the front portion 11, effectively reducing the volume of the container cavity 14 after injection, and further effectively reducing the residual amount of flushing fluid in the container cavity 14.

The wall thickness of the transition container wall 153 of the transition portion 13 is smaller than the wall thickness of the intermediate container wall 164 of the intermediate portion 16, and the transition portion 13 with the thinner wall thickness is more easily folded, so that the resistance of the front portion 11 to reversely push the intermediate portion 16 to start folding and the resistance of the rear portion 12 to push the intermediate portion 16 to start folding are effectively reduced. The transition part 13 is provided with a pre-turning part, the transition part 13 connecting the front part 11 and the middle part 16 is turned outwards and is accommodated in the container cavity 14 at one end of the front part 11 far away from the injection port 10, and the transition part 13 connecting the middle part 16 and the rear part 12 is turned inwards and is accommodated in the container cavity 14 at one end of the middle part 16 far away from the injection port 10.

As shown in fig. 12, the diameter of the front portion 11 and the diameter of the middle portion 16 are set such that the folded flexible wall can be accommodated between the front portion 11 and the middle portion 16 in the radial direction of the cylindrical container 1 after being folded, and the diameter of the rear portion 12 and the diameter of the middle portion 16 are set such that the folded flexible wall can be accommodated between the rear portion 12 and the middle portion 16 in the radial direction of the cylindrical container 1 after being folded. Specifically, the distance 4 from the outer wall of the middle part 16 to the inner wall of the front part 11 along the radial direction of the cylindrical container 1 is not less than the wall thickness of the turned part of the middle part 16, and the distance 4 from the inner wall of the middle part 16 to the outer wall of the rear part 12 along the radial direction of the cylindrical container 1 is not less than the wall thickness of the turned part of the middle part 16. This arrangement ensures that there is sufficient clearance between the inner wall of the front section 11 and the outer wall of the intermediate section 16 to accommodate the folded portion of the intermediate section 16, and between the inner wall of the intermediate section 16 and the outer wall of the rear section 12 to accommodate the folded portion of the intermediate section 16.

Preferably, in order to facilitate the production of the cylindrical container 1, the cylindrical container 1 is bonded by the same material, so that the front portion 11, the middle portion 16, the rear portion 12 and the transition portion 13 are made of flexible materials capable of being folded. The intermediate portion 16 has a smaller wall thickness at the intermediate container wall 164 than at the rear portion 12, the rear container wall 152, and the front portion 11, the front container wall 151, so that the intermediate portion 16 is more easily pushed over relative to the front and rear portions 11, 12.

As shown in fig. 12, the pin 122 may also be integrally formed with the rear portion 12 to facilitate assembly of the product and to optimize the product assembly process.

Referring to fig. 13, the seventh embodiment of the flush syringe of the present invention has substantially the same structure as the sixth embodiment, except that: as shown in fig. 13, in order to avoid deformation of the front part 11 and the middle part 16 when the rear part 12 pushes the front part 11 and the middle part 16, the front part 11 and the middle part 16 are preferably made of flexible materials which can be folded, and the rear part 12 is made of medical plastic materials. Preferably, in order to realize efficient mass production of the cylindrical container 1, the front portion 11, the middle portion 16, the rear portion 12 and the transition portion 13 can be integrally blow-molded, the front portion 11, the middle portion 16, the rear portion 12 and the transition portion 13 are all made of foldable flexible materials, the wall thickness of the front portion 11 is smaller than that of the middle portion 16, the wall thickness of the middle portion 16 is smaller than that of the rear portion 12, and therefore the front portion 11 is more easily pushed to be folded relative to the middle portion 16, and the middle portion 16 is more easily pushed to be folded relative to the rear portion 12. When the rear portion 12 is pushed by hand towards the injection port 10, the middle portion 16 pushes the front container wall 151 of the front portion 11 at the end away from the injection port 10 to be folded inwards and accommodated in the container cavity 14 of the front portion 11 at the end close to the injection port 10, and the rear portion 12 continues to push the rear portion 12 towards the injection port 10, and the middle container wall 164 of the middle portion 16 at the end away from the injection port 10 is pushed inwards and accommodated in the container cavity 14 of the middle portion 16 at the end close to the injection port 10, so that the volume of the container cavity 14 is changed, and the container cavity 14 is pushed to flush the catheter.

The axial length of the front portion 11 and the axial length of the middle portion 16 are both greater than the axial length of the rear portion 12. Preferably, the axial length of the front portion 11 and the axial length of the intermediate portion 16 are each at least 2 times the axial length of the rear portion 12. The arrangement ensures that the middle part 16 has sufficient length to be pushed by the rear part 12 for turning over, and that the front part 11 has sufficient length to be pushed by the middle part 16 for turning over, effectively reducing the volume of the inner cavity 14 of the container after injection, and further reducing the residual quantity of flushing liquid in the inner cavity 14 of the container.

The wall thickness of the transition container wall 153 of the transition portion 13 is smaller than the wall thickness of the front container wall 151 of the front portion 11 and the wall thickness of the middle container wall 164 of the middle portion 16, the transition portion 13 with a thinner wall thickness is easier to fold, and the resistance of the rear portion 12 to push the middle portion 16 to start folding and the resistance of the middle portion 16 to push the front portion 11 to start folding are effectively reduced. The transition part 13 is provided with a pre-folded part, the transition part 13 connecting the front part 11 and the middle part 16 is folded inwards and is accommodated in the container cavity 14 at one end of the front part 11 far away from the injection port 10, the transition part 13 connecting the middle part 16 and the rear part 12 is folded inwards and is accommodated in the container cavity 14 at one end of the middle part 16 far away from the injection port 10, this arrangement effectively reduces the resistance of the front portion 11 to the initial folding of the front container wall 151 at the end remote from the injection port 10, and effectively reduces the resistance of the intermediate container wall 164 at the end of the intermediate portion 16 remote from the injection port 10 to initially fold over, thereby ensuring that the front portion 11 is folded over starting from the front container wall 151 at the end remote from the injection port 10, and ensures that the intermediate portion 16 is folded over from the intermediate container wall 164 at the end remote from the injection port 10, thereby ensuring the reliability and smoothness of the start-up of the flushing.

Preferably, the distance 4 from the outer wall of the middle part 16 to the inner wall of the front part 11 along the radial direction of the cylindrical container 1 is not less than the wall thickness of the turned part of the front part 11, and the distance 4 from the inner wall of the middle part 16 to the outer wall of the rear part 12 along the radial direction of the cylindrical container 1 is not less than the wall thickness of the turned part of the middle part 16. This arrangement ensures that there is sufficient clearance between the inner wall of the front section 11 and the outer wall of the intermediate section 16 to accommodate the folded over portion of the front section 11 and sufficient clearance between the inner wall of the intermediate section 16 and the outer wall of the rear section 12 to accommodate the folded over portion of the intermediate section 16.

Preferably, the cylindrical container 1 may further have a multi-segment middle portion 16, the middle portions 16 being connected to each other by the transition portion 13. The front section 11 is connected to the adjacent intermediate section 16 by the transition section 13, and the rear section 12 is connected to the adjacent intermediate section 16 by the transition section 13. The diameter of the front section 11, the diameter of the intermediate section 16 and the diameter of the rear section 12 decrease in sequence. The hardness of the material of the middle part 16 between the front part 11 and the rear part 12 increases or decreases from the end close to the front part 11 to the end close to the rear part 12; alternatively, the intermediate portion 16, which is located between the front portion 11 and the rear portion 12, has an intermediate receptacle wall 164 that increases or decreases in thickness from the end adjacent the front portion 11 to the end adjacent the rear portion 12. Through the flexible container wall 15 of multistage formula book, the volume of container inner chamber 14 after having further reduced the injection, and then further reduced container inner chamber 14 flush fluid residual amount.

Referring to fig. 15 and 17, an eighth embodiment of a flush syringe according to the present invention is substantially the same as the sixth embodiment except that: as shown in fig. 15 and 17, the diameter of the front portion 11, the diameter of the middle portion 16, and the diameter of the rear portion 12 increase in this order. The rear part 11 is made of medical plastic materials, the front part 11 and the middle part 16 are made of foldable flexible materials, and the hardness of the front part 11 is smaller than that of the middle part 16; alternatively, the wall thickness of the front portion 11 is less than the wall thickness of the middle portion 16, so that the front portion 11 is more easily folded over relative to the middle portion 16. When the rear portion 12 is pushed by hand in the direction of the injection port 10, the middle portion 16 pushes the front portion 11 away from the front container wall 151 at the end of the injection port 10 to be folded outwards and accommodated in the container cavity 14 at the end of the middle portion 16 close to the injection port 10, the rear portion 12 continues to be pushed in the direction of the injection port 10, and the rear portion 12 pushes the middle portion 16 away from the middle container wall 164 at the end of the injection port 10 to be folded outwards and accommodated in the container cavity 14 of the rear portion 12, so that the volume of the container cavity 14 is changed, and the container cavity 14 is pushed with flushing fluid to complete catheter flushing. The flexible container wall 15 is turned over through the syllogic to the above-mentioned setting, has effectively reduced the volume of injection back container inner chamber 14, and then has reduced container inner chamber 14 flush fluid residual amount.

As shown in fig. 15, the axial length of the front portion 11 and the axial length of the middle portion 16 are both greater than the axial length of the rear portion 12. Preferably, the axial length of the front portion 11 and the axial length of the intermediate portion 16 are each at least 2 times the axial length of the rear portion 12. The arrangement ensures that the front part 11 has a container inner cavity 14 which is folded to have enough length and is accommodated in the middle part 16, and ensures that the middle part 16 has a container inner cavity 14 which is folded to have enough length and is accommodated in the rear part 12, so that the volume of the container inner cavity 14 after injection is effectively reduced, and the residual quantity of flushing liquid in the container inner cavity 14 is effectively reduced.

As shown in fig. 15, the wall thickness of the transition container wall 153 of the transition portion 13 is smaller than the wall thickness of the front container wall 151 of the front portion 11 and the wall thickness of the middle container wall 164 of the middle portion 16, so that the transition portion 13 with a thinner wall thickness can be folded more easily, and the resistance of the rear portion 12 to push the middle portion 16 to start folding and the resistance of the middle portion 16 to push the front portion 11 to start folding are effectively reduced. The transition portion 13 is provided with a pre-folded portion, the transition portion 13 connecting the front portion 11 and the middle portion 16 is folded back and is accommodated in the container cavity 14 of the middle portion 16 near the end of the injection port 10, the transition portion 13 connecting the middle portion 16 and the rear portion 12 is folded back and is accommodated in the container cavity 14 of the rear portion 12 near the end of the injection port 10, this arrangement effectively reduces the resistance of the front portion 11 to the initial folding of the front container wall 151 at the end remote from the injection port 10, and effectively reduces the resistance of the intermediate container wall 164 at the end of the intermediate portion 16 remote from the injection port 10 to initially fold over, thereby ensuring that the front portion 11 is folded over starting from the front container wall 151 at the end remote from the injection port 10, and ensures that the intermediate portion 16 is folded over from the intermediate container wall 164 at the end remote from the injection port 10, thereby ensuring the reliability and smoothness of the start-up of the flushing.

As shown in fig. 15, the distance 4 from the inner wall of the middle portion 16 to the outer wall of the front portion 11 in the radial direction of the cylindrical container 1 is not smaller than the wall thickness of the folded portion of the front portion 11, and the distance 4 from the outer wall of the middle portion 16 to the inner wall of the rear portion 12 in the radial direction of the cylindrical container 1 is not smaller than the wall thickness of the folded portion of the middle portion 16. This arrangement ensures that there is sufficient clearance between the outer wall of the front section 11 and the inner wall of the intermediate section 16 to accommodate the folded over portion of the front section 11 and sufficient clearance between the outer wall of the intermediate section 16 and the inner wall of the rear section 12 to accommodate the folded over portion of the intermediate section 16.

Preferably, in order to facilitate the production of the cylindrical container 1, the cylindrical container 1 is bonded by the same material, so that the front portion 11, the middle portion 16, the rear portion 12 and the transition portion 13 are made of flexible materials capable of being folded. The wall thickness of the front section 11, the wall thickness of the middle section 16 and the wall thickness of the rear section 12 are successively increased, so that the middle section 16 is more easily pushed over relative to the rear section 12 and the front section 11 is more easily pushed over relative to the middle section 16.

Referring to fig. 16, the ninth embodiment of the flush syringe of the present invention has substantially the same structure as the eighth embodiment, and is different therefrom in that: as shown in fig. 16, in order to avoid the deformation of the front part 11 when pushing the middle part 16, the back part 12 and the middle part 16 are made of flexible materials which can be folded, and the front part 11 is made of medical plastic materials. Preferably, in order to realize efficient mass production of the cylindrical container 1, the front portion 11, the middle portion 16, the rear portion 12 and the transition portion 13 can be integrally blow-molded, the front portion 11, the middle portion 16, the rear portion 12 and the transition portion 13 are all made of foldable flexible materials, the wall thickness of the front portion 11 is larger than that of the middle portion 16, the wall thickness of the middle portion 16 is larger than that of the rear portion 12, and therefore the rear portion 12 is more easily pushed to be folded relative to the middle portion 16, and the middle portion 16 is more easily pushed to be folded relative to the front portion 11. When the rear portion 12 is manually pushed toward the injection port 10, the middle portion 16 reversely pushes the rear portion 12 away from the rear container wall 152 at the end of the injection port 10 to be folded inward and accommodated in the container cavity 14 of the rear portion 12, and the rear portion 12 is continuously pushed toward the injection port 10, and the front portion 11 reversely pushes the middle portion 16 close to the end of the injection port 10 to be folded inward and accommodated in the container cavity 14 at the central position of the middle portion 16, so that the volume of the container cavity 14 is changed, and the container cavity 14 is pushed with flushing fluid to complete catheter flushing.

As shown in fig. 16, the axial length of the rear portion 12 and the axial length of the intermediate portion 16 are both greater than the axial length of the front portion 11. Preferably, the axial length of the rear portion 12 and the axial length of the intermediate portion 16 are each at least 2 times the axial length of the front portion 11. The arrangement ensures that the rear part 12 has enough length to be pushed by the middle part 16 for turning, ensures that the middle part 16 has enough length to be pushed by the front part 11 for turning, effectively reduces the volume of the inner cavity 14 of the container after injection, and further reduces the residual quantity of flushing liquid in the inner cavity 14 of the container.

Preferably, the transition portion 13 transitions the wall thickness of the container wall 153 to be less than both the wall thickness of the intermediate container wall 164 of the intermediate portion 16 and the wall thickness of the rear container wall 152 of the rear portion 12, and the transition portion 13, which is thinner in wall thickness, is more easily folded, effectively reducing the resistance of the front portion 11 to pushing the intermediate portion 16 to initiate folding and the resistance of the intermediate portion 16 to pushing the rear portion 12 to initiate folding. The transition portion 13 is provided with a pre-folded portion, the transition portion 13 connecting the front portion 11 and the middle portion 16 is folded inward and accommodated in the container cavity 14 of the middle portion 16 near the end of the injection port 10, the transition portion 13 connecting the middle portion 16 and the rear portion 12 is folded inward and accommodated in the container cavity 14 of the rear portion 12 near the end of the injection port 10, this arrangement effectively reduces the resistance of the intermediate container wall 164 at the end of the intermediate portion 16 adjacent the injection port 10 to initially fold over, and effectively reduces the resistance of the rear portion 12 to the initial folding of the rear container wall 152 near the end of the injection port 10, thereby ensuring that the intermediate portion 16 is folded over from the intermediate container wall 164 near one end of the injection port 10, and ensures that the rear portion 12 is folded over by the rear container wall 152 near the end of the injection port 10, thereby ensuring the reliability and smoothness of the start-up of the flushing.

Preferably, the distance 4 from the inner wall of the middle part 16 to the outer wall of the front part 11 along the radial direction of the cylindrical container 1 is not less than the wall thickness of the turned part of the middle part 16, and the distance 4 from the outer wall of the middle part 16 to the inner wall of the rear part 12 along the radial direction of the cylindrical container 1 is not less than the wall thickness of the turned part of the rear part 12. This arrangement ensures that there is sufficient clearance between the outer wall of the front section 11 and the inner wall of the intermediate section 16 to accommodate the folded portion of the intermediate section 16 and sufficient clearance between the outer wall of the intermediate section 16 and the inner wall of the rear section 12 to accommodate the folded portion of the rear section 12.

The cylindrical container 1 may also have a multi-segment intermediate portion 16, the intermediate portions 16 being connected to each other by the transition portion 13. The front section 11 is connected to the adjacent intermediate section 16 by the transition section 13, and the rear section 12 is connected to the adjacent intermediate section 16 by the transition section 13. The diameter of the front section 11, the diameter of the intermediate section 16 and the diameter of the rear section 12 increase in sequence. The hardness of the material of the middle part 16 between the front part 11 and the rear part 12 is gradually decreased or increased from the end close to the front part 11 to the end close to the rear part 12; alternatively, the intermediate portion 16, which is located between the front portion 11 and the rear portion 12, has an intermediate receptacle wall 164 that decreases or increases in thickness from the end adjacent the front portion 11 to the end adjacent the rear portion 12. Through the flexible container wall 15 of multistage formula book, the volume of container inner chamber 14 after having further reduced the injection, and then further reduced container inner chamber 14 flush fluid residual amount.

Referring to fig. 18 and 19, a tenth embodiment of a flush syringe according to the present invention is substantially the same as the sixth embodiment except that: as shown in fig. 18 and 19, the diameter of the front portion 11 and the diameter of the rear portion 12 are both larger than the diameter of the middle portion 16. The middle part 16 is made of medical plastic materials, and the front part 11 and the rear part 12 are made of foldable flexible materials. The front and rear portions 11, 12 are therefore more easily pushed over relative to the middle portion 16. When the rear portion 12 is pushed by hand towards the injection port 10, the middle portion 16 reversely pushes the rear container wall 152 of the rear portion 12 near the end of the injection port 10 to be folded inwards and accommodated in the container cavity 14 of the rear portion 12 far from the end of the injection port 10, and pushes the front container wall 151 of the front portion 11 far from the end of the injection port 10 to be folded inwards and accommodated in the container cavity 14 of the front portion 11 near the end of the injection port 10, so as to change the volume of the container cavity 14 and further push the container cavity 14 to flush the catheter.

Preferably, the axial length of the intermediate portion 16 is not less than the axial length of the rear portion 12 and the front portion 11. The arrangement ensures that the intermediate portion 16 has sufficient length for pushing the front portion 11 and the rear portion 12, effectively reducing the volume of the inner cavity 14 of the container after injection, and further effectively reducing the residual quantity of flushing liquid in the inner cavity 14 of the container.

Preferably, the wall thickness of the transition portion 13 of the transition container wall 153 is smaller than the wall thickness of the container wall 151 in front of the front portion 11 and the wall thickness of the container wall 152 in back of the back portion 12, the transition portion 13 with a thinner wall thickness is more easily folded, and the resistance of the middle portion 16 to push the back portion 12 to start folding and the resistance of the middle portion 16 to push the front portion 11 to start folding are effectively reduced. The transition part 13 is provided with a pre-folded part, the transition part 13 connecting the front part 11 and the middle part 16 is folded inwards and is accommodated in the container cavity 14 at one end of the front part 11 far away from the injection port 10, the transition part 13 connecting the middle part 16 and the rear part 12 is folded inwards and is accommodated in the container cavity 14 at one end of the rear part 12 close to the injection port 10, this arrangement effectively reduces the resistance of the front portion 11 to the initial folding of the front container wall 151 at the end remote from the injection port 10, and effectively reduces the resistance of the rear portion 12 to the initial folding of the rear container wall 152 near the end of the injection port 10, thereby ensuring that the front portion 11 is folded over starting from the front container wall 151 at the end remote from the injection port 10, and ensures that the rear portion 12 is folded over by the rear container wall 152 near the end of the injection port 10, thereby ensuring the reliability and smoothness of the start-up of the flushing.

Preferably, the distance 4 from the outer wall of the middle part 16 to the inner wall of the front part 11 along the radial direction of the cylindrical container 1 is not less than the wall thickness of the turned part of the front part 11, and the distance 4 from the outer wall of the middle part 16 to the inner wall of the rear part 12 along the radial direction of the cylindrical container 1 is not less than the wall thickness of the turned part of the rear part 12. The above arrangement ensures that there is sufficient clearance between the inner wall of the front section 11 and the outer wall of the intermediate section 16 to accommodate the folded-over portion of the front section 11 and that there is sufficient clearance between the inner wall of the rear section 12 and the outer wall of the intermediate section 16 to accommodate the folded-over portion of the rear section 12.

Preferably, in order to avoid deformation when the rear portion 12 pushes the middle portion 16, the middle portion 16 may be made of a flexible material capable of being folded, and the front portion 11 and the rear portion 12 are made of medical plastic materials. The intermediate portion 16 is therefore more easily pushed over relative to the front and rear portions 11, 12. When the rear portion 12 is pushed by hand in the direction of the injection port 10, the rear portion 12 pushes the middle portion 16 to be folded outwardly away from the middle container wall 164 at the end of the injection port 10 and accommodated in the container cavity 14 of the rear portion 12, and the front portion 11 pushes the middle portion 16 to be folded outwardly near the middle container wall 164 at the end of the injection port 10 and accommodated in the container cavity 14 of the front portion 11, so as to change the volume of the container cavity 14 and further push the container cavity 14 with flushing fluid to complete the catheter flushing.

The intermediate portion 16 has an axial length at least 2 times the axial length of the rear portion 12 and the front portion 11. The arrangement ensures that the intermediate portion 16 has sufficient length to be pushed by the front and rear portions 11, 12 for folding, effectively reducing the volume of the container cavity 14 after injection, and further reducing the residual amount of flushing fluid in the container cavity 14.

Referring to fig. 20 and 21, an eleventh embodiment of a flush syringe according to the present invention has substantially the same structure as the tenth embodiment, except that: as shown in fig. 20 and 21, the diameter of the front portion 11 and the diameter of the rear portion 12 are both smaller than the diameter of the middle portion 16. The middle part 16 is made of medical plastic materials, and the front part 11 and the rear part 12 are made of foldable flexible materials. The front and rear portions 11, 12 are therefore more easily pushed over relative to the middle portion 16. When the rear portion 12 is manually pushed toward the injection port 10, the middle portion 16 pushes the front container wall 151 of the front portion 11 away from the end of the injection port 10 to fold outwardly and accommodate in the container cavity 14 of the middle portion 16 near the end of the injection port 10, and pushes the rear container wall 152 of the rear portion 12 near the end of the injection port 10 to fold outwardly and accommodate in the container cavity 14 of the middle portion 16 away from the end of the injection port 10, thereby changing the volume of the container cavity 14 and thus pushing the container cavity 14 to flush the catheter. The intermediate portion 16 has an axial length not less than the axial length of the rear portion 12 and the front portion 11. The above arrangement ensures that the intermediate portion 16 has sufficient length to push the front and rear portions 11, 12, effectively reducing the volume of the inner chamber 14 of the container after injection, and thereby reducing the residual amount of flushing fluid in the inner chamber 14 of the container.

Preferably, the distance 4 from the inner wall of the middle part 16 to the outer wall of the front part 11 along the radial direction of the cylindrical container 1 is not less than the wall thickness of the turned part of the front part 11, and the distance 4 from the inner wall of the middle part 16 to the outer wall of the rear part 12 along the radial direction of the cylindrical container 1 is not less than the wall thickness of the turned part of the rear part 12. The above arrangement ensures that there is sufficient clearance between the inner wall of the intermediate section 16 and the outer wall of the front section 11 to accommodate the folded over portion of the front section 11 and sufficient clearance between the inner wall of the intermediate section and the outer wall of the rear section 12 to accommodate the folded over portion of the rear section 12.

Preferably, the wall thickness of the transition portion 13 of the transition container wall 153 is smaller than the wall thickness of the container wall 151 in front of the front portion 11 and the wall thickness of the container wall 152 in back of the back portion 12, the transition portion 13 with a thinner wall thickness is more easily folded, and the resistance of the middle portion 16 to push the back portion 12 to start folding and the resistance of the middle portion 16 to push the front portion 11 to start folding are effectively reduced. The transition portion 13 is provided with a pre-folded portion, the transition portion 13 connecting the front portion 11 and the middle portion 16 is folded back and accommodated in the container cavity 14 at the end of the middle portion 16 close to the injection port 10, the transition portion 13 connecting the middle portion 16 and the rear portion 12 is folded back and accommodated in the container cavity 14 at the end of the middle portion 16 far from the injection port 10, this arrangement effectively reduces the resistance of the front portion 11 to the initial folding of the front container wall 151 at the end remote from the injection port 10, and effectively reduces the resistance of the rear portion 12 to the initial folding of the rear container wall 152 near the end of the injection port 10, thereby ensuring that the front portion 11 is folded over starting from the front container wall 151 at the end remote from the injection port 10, and ensures that the rear portion 12 is folded over by the rear container wall 152 near the end of the injection port 10, thereby ensuring the reliability and smoothness of the start-up of the flushing.

Preferably, in order to avoid deformation when the rear portion 12 pushes the middle portion 16, the middle portion 16 may be made of a flexible material capable of being folded, and the front portion 11 and the rear portion 12 are made of medical plastic materials. The intermediate portion 16 is therefore more easily pushed over relative to the front and rear portions 11, 12. When the rear portion 12 is manually pushed toward the injection port 10, the rear portion 12 pushes the intermediate container wall 164 of the intermediate portion 16 at the end away from the injection port 10 to be folded inward and accommodated in the container cavity 14 of the intermediate portion 16 near the center, and the front portion 11 pushes the intermediate container wall 164 of the intermediate portion 16 at the end near the injection port 10 to be folded inward and accommodated in the container cavity 14 of the intermediate portion 16 near the center, so as to change the volume of the container cavity 14, thereby injecting the container cavity 14 to complete the catheter flushing.

The intermediate portion 16 has an axial length at least 2 times the axial length of the rear portion 12 and the axial length of the front portion 11. The arrangement ensures that the intermediate portion 16 has sufficient length to be pushed by the front and rear portions 11, 12 for folding, effectively reducing the volume of the container cavity 14 after injection, and further reducing the residual amount of flushing fluid in the container cavity 14.

Referring to fig. 22, the twelfth embodiment of the flush syringe of the present invention has substantially the same structure as the sixth embodiment, and is different therefrom in that: as shown in fig. 22, the cylindrical container 1 has a plurality of sections of the intermediate portion 16 between the front portion 11 and the rear portion 12, specifically, the intermediate portion 16 is divided into a first intermediate portion 161 near the front portion 11 and a second intermediate portion 162 near the rear portion 12, and the diameters of the front portion 11 and the second intermediate portion 162 are larger than the diameters of the first intermediate portion 161 and the rear portion 12. The front part 11 and the second middle part 162 are made of medical plastic materials, and the first middle part 161 and the rear part 12 are made of flexible materials which can be folded. The first intermediate portion 161 is therefore more easily pushed folded relative to the front portion 11 and the rear portion 12 is more easily pushed folded relative to the second intermediate portion 162. When the rear portion 12 is manually pushed toward the injection port 10, the second intermediate portion 162 reversely pushes the rear container wall 152 of the rear portion 12 near the end of the injection port 10 to fold outwardly and be accommodated in the container cavity 14 of the second intermediate portion 162 at the end away from the injection port 10, simultaneously pushes the intermediate container wall 164 of the first intermediate portion 161 at the end away from the injection port 10 to fold outwardly and be accommodated in the container cavity 14 of the second intermediate portion 162 near the end of the injection port 10, and reversely pushes the intermediate container wall 164 of the first intermediate portion 161 near the end of the injection port 10 to fold outwardly and be accommodated in the accommodating cavity 14 of the front portion 11, thereby changing the volume of the container cavity 14 and further pushing the container cavity 14 with flushing fluid to complete the catheter flushing. The intermediate portion 16 has an axial length not less than the axial length of the rear portion 12 and the front portion 11. The above arrangement ensures that the first intermediate portion 161 has a sufficient length to be pushed by the front portion 11 and the second intermediate portion 162 for folding, and ensures that the second intermediate portion 162 has a sufficient length to be pushed by the first intermediate portion 161 and the rear portion 12, effectively reducing the volume of the container cavity 14 after injection, and further reducing the residual amount of the flushing fluid in the container cavity 14.

Preferably, the wall thickness of the transition container wall 153 of the transition portion 13 is smaller than both the wall thickness of the intermediate container wall 164 of the first intermediate portion 161 and the wall thickness of the rear container wall 152 of the rear portion 12, the transition portion 13 with a thinner wall thickness is more easily folded, effectively reducing the resistance of the second intermediate portion 162 to pushing the rear portion 12 to start folding, the resistance of the second intermediate portion 162 to pushing the first intermediate portion 161 to start folding, and the resistance of the front portion 11 to pushing the first intermediate portion 161 to start folding. The arrangement of the transition portion 13 having a pre-fold, the transition portion 13 connecting the front portion 11 and the first intermediate portion 161 being pre-fold outwardly and received in the container cavity 14 at the end of the front portion 11 remote from the injection port 10, the transition portion 13 connecting the first intermediate portion 161 and the second intermediate portion 162 being pre-fold outwardly and received in the container cavity 14 of the second intermediate portion 162, the transition portion 13 connecting the second intermediate portion 162 and the rear portion 12 being pre-fold outwardly and received in the container cavity 14 of the second intermediate portion 162 effectively reduces the resistance to initial folding of the intermediate container walls 164 at the two ends of the first intermediate portion 161 and effectively reduces the resistance to initial folding of the rear container wall 152 at the end of the rear portion 12 adjacent to the injection port 10, thereby ensuring that the first intermediate portion 161 is initially folded by the intermediate container walls 164 at the two ends and ensuring that the rear portion 12 is initially folded by the rear container wall 152 adjacent to the end of the injection port 10, thereby ensuring the reliability and smoothness of the flushing start.

Preferably, the diameters of the first intermediate portion 161 and the second intermediate portion 162 are set such that the foldable flexible wall can be accommodated between the first intermediate portion 161 and the second intermediate portion 162 in the radial direction of the cylindrical container 1 after being folded. Specifically, a distance 4 from the outer wall of the first middle portion 161 to the inner wall of the front portion 11 in the radial direction of the cylindrical container 1 is not smaller than the wall thickness of the folded portion of the first middle portion 161, a distance 4 from the inner wall of the second middle portion 162 to the outer wall of the rear portion 12 in the radial direction of the cylindrical container 1 is not smaller than the wall thickness of the folded portion of the rear portion 12, and a distance 4 from the outer wall of the first middle portion 161 to the inner wall of the second middle portion 162 in the radial direction of the cylindrical container 1 is not smaller than the wall thickness of the folded portion of the first middle portion 161. The above arrangement ensures not only that there is sufficient clearance between the inner wall of the front section 11 and the outer wall of the first intermediate section 161 to accommodate the folded-over section of the first intermediate section 161, but also that there is sufficient clearance between the outer wall of the first intermediate section 161 and the inner wall of the second intermediate section 162 to accommodate the folded-over section of the first intermediate section 161, and also that there is sufficient clearance between the inner wall of the second intermediate section 162 and the outer wall of the rear section 12 to accommodate the folded-over section of the rear section 12.

Preferably, in order to avoid the deformation of the rear portion 12 when pushing the second middle portion 162, the front portion 11 and the second middle portion 162 are made of flexible material capable of being folded, and the first middle portion 161 and the rear portion 12 are made of medical plastic material. The front section 11 is therefore more easily pushed folded relative to the first intermediate section 161 and the second intermediate section 162 is more easily pushed folded relative to the rear section 12 and the first intermediate section 161. When the rear portion 12 is manually pushed toward the injection port 10, the rear portion 12 pushes the intermediate container wall 164 of the second intermediate portion 162 at the end away from the injection port 10 to be folded inward and accommodated in the container cavity 14 of the second intermediate portion 162 at the position close to the center, the first intermediate portion 161 pushes the intermediate container wall 164 of the second intermediate portion 162 at the end close to the injection port 10 to be folded inward and accommodated in the container cavity 14 of the second intermediate portion 162 at the position close to the center, and simultaneously pushes the front container wall 151 of the front portion 11 at the end away from the injection port 10 to be folded inward and accommodated in the container cavity 14 of the front portion 11 at the end close to the injection port 10, thereby pushing the container cavity 14 with flushing fluid to complete the catheter flushing. The intermediate portion 16 has an axial length not less than the axial length of the rear portion 12 and the front portion 11. The arrangement not only ensures that the first middle part 161 has enough length to push the second middle part 162 and the front part 11, but also ensures that the second middle part 162 has enough length to be pushed by the first middle part 161 and the rear part 12 for folding, thereby effectively reducing the volume of the inner cavity 14 of the container after injection and further reducing the residual quantity of the flushing liquid in the inner cavity 14 of the container.

Referring to fig. 23, the thirteenth embodiment of the flush syringe of the present invention has substantially the same structure as the twelfth embodiment, except that: as shown in fig. 23, the diameters of the front portion 11 and the second intermediate portion 162 are smaller than the diameters of the first intermediate portion 161 and the rear portion 12. The front part 11 and the second middle part 162 are made of medical plastic materials, and the first middle part 161 and the rear part 12 are made of flexible materials which can be folded. The first intermediate portion 161 is therefore more easily pushed folded relative to the front portion 11, the second intermediate portion 162, and the rear portion 12 is more easily pushed folded relative to the second intermediate portion 162. When the rear portion 12 is manually pushed toward the injection port 10, the second intermediate portion 162 reversely pushes the rear container wall 152 of the rear portion 12 near the end of the injection port 10 to be folded inward and accommodated in the container cavity 14 of the rear portion 16 far from the end of the injection port 10, simultaneously pushes the intermediate container wall 164 of the first intermediate portion 161 far from the end of the injection port 10 to be folded inward and accommodated in the container cavity 14 of the first intermediate portion 161 near the center, and reversely pushes the intermediate container wall 164 of the first intermediate portion 161 near the end of the injection port 10 to be folded inward and accommodated in the accommodating cavity 14 of the first intermediate portion 161 near the center, thereby changing the volume of the container cavity 14 and further pushing the container cavity 14 with flushing fluid to complete the catheter flushing.

The intermediate portion 16 has an axial length not less than the axial length of the rear portion 12 and the front portion 11. The arrangement ensures that the first middle part 161 has enough length to be pushed by the front part 11 and the second middle part 162 for folding, and ensures that the second middle part 162 has enough length to push the first middle part 161 and the rear part 12, thereby effectively reducing the volume of the inner cavity 14 of the container after injection and further effectively reducing the residual quantity of flushing liquid in the inner cavity 14 of the container.

Preferably, the wall thickness of the transition portion 13 of the transition container wall 153 is smaller than both the wall thickness of the intermediate container wall 164 of the first intermediate portion 161 and the wall thickness of the rear container wall 152 of the rear portion 12, the transition portion 13 with a thinner wall thickness is more easily folded, and the resistance of the second intermediate portion 162 to pushing the rear portion 12 to start folding, the resistance of the second intermediate portion 162 to pushing the first intermediate portion 161 to start folding, and the resistance of the front portion 11 to pushing the first intermediate portion 161 to start folding are effectively reduced. The arrangement of the transition portion 13 provided with a pre-folded portion, the transition portion 13 connecting the front portion 11 and the first intermediate portion 161 being folded inward and accommodated in the container cavity 14 of the first intermediate portion 161, the transition portion 13 connecting the first intermediate portion 161 and the second intermediate portion 162 being folded inward and accommodated in the container cavity 14 of the first intermediate portion 161, the transition portion 13 connecting the second intermediate portion 162 and the rear portion 12 being folded inward and accommodated in the container cavity 14 of the rear portion 12 near the end of the injection port 10 is effective to reduce the resistance to the initial folding of the intermediate container walls 164 at both ends of the first intermediate portion 161 and to reduce the resistance to the initial folding of the rear container wall 152 of the rear portion 12 near the end of the injection port 10, thereby ensuring that the first intermediate portion 161 is started from the intermediate container walls 164 at both ends and ensuring that the rear portion 12 is started from the rear container wall 152 near the end of the injection port 10, thereby ensuring the reliability and smoothness of the flushing start.

Preferably, a distance 4 from the inner wall of the first middle portion 161 to the outer wall of the front portion 11 in the radial direction of the cylindrical container 1 is not smaller than a wall thickness of the folded portion of the first middle portion 161, a distance 4 from the outer wall of the second middle portion 162 to the inner wall of the rear portion 12 in the radial direction of the cylindrical container 1 is not smaller than a wall thickness of the folded portion of the rear portion 12, and a distance 4 from the inner wall of the first middle portion 161 to the outer wall of the second middle portion 162 in the radial direction of the cylindrical container 1 is not smaller than a wall thickness of the folded portion of the first middle portion 161. The above arrangement ensures not only that there is sufficient clearance between the outer wall of the front section 11 and the inner wall of the first intermediate section 161 to accommodate the folded-over section of the first intermediate section 161, but also that there is sufficient clearance between the inner wall of the first intermediate section 161 and the outer wall of the second intermediate section 162 to accommodate the folded-over section of the first intermediate section 161, and also that there is sufficient clearance between the outer wall of the second intermediate section 162 and the inner wall of the rear section 12 to accommodate the folded-over section of the rear section 12.

Preferably, in order to avoid the deformation of the rear portion 12 when pushing the second middle portion 162, the front portion 11 and the second middle portion 162 are made of flexible material capable of being folded, and the first middle portion 161 and the rear portion 12 are made of medical plastic material. The front section 11 is therefore more easily pushed folded relative to the first intermediate section 161 and the second intermediate section 162 is more easily pushed folded relative to the first intermediate section 161 and the rear section 12. When the rear portion 12 is manually pushed toward the injection port 10, the rear portion 12 pushes the intermediate container wall 164 of the second intermediate portion 162 at the end away from the injection port 10 to be folded outwardly and accommodated in the container cavity 14 of the rear portion 12, the first intermediate portion 161 reversely pushes the intermediate container wall 164 of the second intermediate portion 162 at the end close to the injection port 10 to be folded outwardly and accommodated in the container cavity 14 of the first intermediate portion 161 at the position close to the center, and simultaneously pushes the front container wall 151 of the front portion 11 at the end away from the injection port 10 to be folded outwardly and accommodated in the container cavity 14 of the first intermediate portion 161 at the position close to the center, so as to change the volume of the container cavity 14, and further inject the flushing fluid into the container cavity 14 to complete the catheter flushing.

The intermediate portion 16 has an axial length not less than the axial length of the rear portion 12 and the front portion 11. The arrangement not only ensures that the first middle part 161 has enough length to push the second middle part 162 and the front part 11, but also ensures that the second middle part 162 has enough length to be pushed by the first middle part 161 and the rear part 12 for turning over, thereby effectively reducing the volume of the inner cavity 14 of the container after injection and further reducing the residual quantity of the flushing liquid in the inner cavity 14 of the container.

Referring to fig. 24, the fourteenth embodiment of the flush syringe of the present invention has substantially the same structure as the twelfth embodiment, except that: as shown in fig. 24, the intermediate portion 16 is divided into a first intermediate portion 161 near the front portion 11, a second intermediate portion 162 near the rear portion 12, and a third intermediate portion 163 located between the first intermediate portion 161 and the second intermediate portion 162, and the first intermediate portion 161 and the second intermediate portion 162 each have a diameter smaller than the diameters of the front portion 11, the third intermediate portion 163, and the rear portion 12. The front portion 11, the third middle portion 163 and the rear portion 12 are all made of medical plastic, and the first middle portion 161 and the second middle portion 162 are all made of foldable flexible materials. The first intermediate portion 161 is therefore more easily pushed to fold relative to the front portion 11, the third intermediate portion 163, and the second intermediate portion 162 is more easily pushed to fold relative to the third intermediate portion 163 and the rear portion 12. When the rear section 12 is manually pushed toward the injection port 10, the rear section 12 pushes the intermediate container wall 164 of the adjacent second intermediate section 162 at the end away from the injection port 10 to be folded outwardly and accommodated in the container cavity 14 of the rear section 12, the third intermediate section 163 pushes the intermediate container wall 164 of the second intermediate section 162 at the end close to the injection port 10 to be folded outwardly and accommodated in the container cavity 14 of the third intermediate section 163 at the position close to the center, while pushing the intermediate container wall 164 of the first intermediate portion 161 at the end remote from the injection port 10 to fold outwardly and be received in the container cavity 14 of the third intermediate portion 163 at the near-center position, the front portion 11 pushes the intermediate container wall 164 of the first intermediate portion 161 at the end near the injection port 10 to fold outwardly and be received in the container cavity 14 of the front portion 15 in the opposite direction, thereby changing the volume of the container lumen 14 and thereby pushing the container lumen 14 of the flushing fluid to complete the catheter flush.

The intermediate portion 16 has an axial length not less than the axial length of the rear portion 12 and the front portion 11. The above arrangement not only ensures that the first intermediate portion 161 has a sufficient length to be pushed by the front portion 11 and the third intermediate portion 163 for the turnover, but also ensures that the third intermediate portion 163 has a sufficient length to be pushed by the first intermediate portion 161 and the second intermediate portion 162, and also ensures that the second intermediate portion 162 has a sufficient length to be pushed by the third intermediate portion 163 and the rear portion 12 for the turnover, so as to effectively reduce the volume of the container cavity 14 after injection, and further reduce the residual amount of the flushing fluid in the container cavity 14.

Preferably, the wall thickness of the transition portion 13 of the transition container wall 153 is smaller than both the wall thickness of the intermediate container wall 164 of the first intermediate portion 161 and the wall thickness of the intermediate container wall 164 of the second intermediate portion 162, the transition portion 13 with a thinner wall thickness is more easily folded, effectively reducing the resistance of the front portion 11 to pushing the first intermediate portion 161 to start folding, the resistance of the third intermediate portion 163 to pushing the first intermediate portion 161 and the second intermediate portion 162 to start folding, and the resistance of the rear portion 12 to pushing the second intermediate portion 162 to start folding. The transition portion 13 is provided with a pre-folded portion, the transition portion 13 connecting the front portion 11 and the first intermediate portion 161 is pre-folded outwardly and accommodated in the container cavity 14 at the end of the front portion 11 remote from the injection port 10, the transition portion 13 connecting the first intermediate portion 161 and the third intermediate portion 163 is pre-folded outwardly and accommodated in the container cavity 14 of the third intermediate portion 163, the transition portion 13 connecting the third intermediate portion 163 and the second intermediate portion 162 is pre-folded outwardly and accommodated in the container cavity 14 of the third intermediate portion 163, the transition portion 13 connecting the second intermediate portion 162 and the rear portion 12 is pre-folded outwardly and accommodated in the container cavity 14 at the end of the rear portion 12 near the injection port 10, the above arrangement is effective to reduce the resistance to initial folding of the intermediate container wall 164 at both ends of the first intermediate portion 161 and the resistance to initial folding of the intermediate container wall 164 at both ends of the second intermediate portion 162, thereby ensuring that the first intermediate portion 161 is folded by the intermediate container walls 164 at both ends and that the second intermediate portion 162 is folded by the intermediate container walls 164 at both ends, thereby ensuring the reliability and smoothness of the flushing start.

Preferably, the diameters of the first middle part 161 and the third middle part 163 are set such that the foldable flexible wall can be accommodated between the first middle part 161 and the third middle part 163 in the radial direction of the cylindrical container 1 after being folded, and the diameters of the second middle part 162 and the third middle part 163 are set such that the foldable flexible wall can be accommodated between the second middle part 162 and the third middle part 163 in the radial direction of the cylindrical container 1 after being folded. Specifically, a distance 4 from the outer wall of the first middle portion 161 to the inner wall of the front portion 11 along the radial direction of the cylindrical container 1 is not less than the wall thickness of the folded portion of the first middle portion 161, a distance 4 from the outer wall of the first middle portion 161 to the inner wall of the third middle portion 163 along the radial direction of the cylindrical container 1 is not less than the wall thickness of the folded portion of the first middle portion 161, a distance 4 from the inner wall of the third middle portion 163 to the outer wall of the second middle portion 162 along the radial direction of the cylindrical container 1 is not less than the wall thickness of the folded portion of the second middle portion 162, and a distance 4 from the outer wall of the second middle portion 162 to the inner wall of the rear portion 12 along the radial direction of the cylindrical container 1 is not less than the wall thickness of the folded portion of. The above arrangement ensures that there is sufficient clearance between the inner wall of the front section 11 and the outer wall of the first intermediate section 161 to accommodate the folded portion of the first intermediate section 161, that there is sufficient clearance between the outer wall of the first intermediate section 161 and the inner wall of the third intermediate section 163 to accommodate the folded portion of the first intermediate section 161, that there is sufficient clearance between the inner wall of the third intermediate section 163 and the outer wall of the second intermediate section 162 to accommodate the folded portion of the second intermediate section 162, and that there is sufficient clearance between the outer wall of the second intermediate section 162 and the inner wall of the rear section 12 to accommodate the folded portion of the second intermediate section 162.

Preferably, the front portion 11, the third middle portion 163 and the rear portion 12 are made of a foldable flexible material, and the first middle portion 161 and the second middle portion 162 are made of a medical plastic material. The front section 11, the third intermediate section 163, and the rear section 12 are therefore more easily pushed to fold relative to the first intermediate section 161, and the third intermediate section 163 and the rear section 12 are more easily pushed to fold relative to the second intermediate section 162. When the rear section 12 is pushed by hand in the direction of the injection port 10, the second intermediate section 162 pushes back the rear container wall 152 of the rear section 12 near the end of the injection port 10, which is folded inwards and accommodated in the container cavity 14 at the end of the rear section 12 remote from the injection port 10, while urging the intermediate container wall 164 of the third intermediate portion 163 at the end remote from the injection port 10 to fold inwardly and be received in the container cavity 14 of the third intermediate portion 163 at a position near the center, the first intermediate portion 161 oppositely urges the intermediate container wall 164 of the third intermediate portion 163 at the end near the injection port 10 to fold inwardly and be received in the container cavity 14 of the third intermediate portion 163 at a position near the center, while pushing the front container wall 151 of the front portion 11 at the end remote from the injection port 10 to fold inwards and to be accommodated in the container cavity 14 of the front portion 11 at the end close to the injection port 10, thereby changing the volume of the container lumen 14 and thereby pushing the container lumen 14 of the flushing fluid to complete the catheter flush. The intermediate portion 16 has an axial length not less than the axial length of the rear portion 12 and the front portion 11. The above arrangement not only ensures that the first intermediate portion 161 has a sufficient length for pushing the front portion 11 and the third intermediate portion 163, but also ensures that the third intermediate portion 163 has a sufficient length to be pushed by the first intermediate portion 161 and the second intermediate portion 162 for turning, and also ensures that the second intermediate portion 162 has a sufficient length for pushing the third intermediate portion 163 and the rear portion 12, which effectively reduces the volume of the container cavity 14 after injection, and further effectively reduces the residual amount of flushing fluid in the container cavity 14.

Referring to fig. 25, a fifteenth embodiment of a flush syringe according to the present invention has substantially the same structure as the fourteenth embodiment, except that: as shown in fig. 25, the diameters of the first intermediate portion 161 and the second intermediate portion 162 are each larger than the diameters of the front portion 11, the third intermediate portion 163, and the rear portion 12. The front portion 11, the third middle portion 163 and the rear portion 12 are all made of medical plastic, and the first middle portion 161 and the second middle portion 162 are all made of foldable flexible materials. The first intermediate portion 161 is therefore more easily pushed to fold relative to the front portion 11, the third intermediate portion 163, and the second intermediate portion 162 is more easily pushed to fold relative to the third intermediate portion 163 and the rear portion 12. When the rear portion 12 is pushed by hand in the direction of the injection port 10, the rear portion 12 pushes the intermediate container wall 164 of the second intermediate portion 162 at the end remote from the injection port 10 to be folded inward and accommodated in the container cavity 14 of the second intermediate portion 162 at the position close to the center, the third intermediate portion 163 pushes the intermediate container wall 164 of the second intermediate portion 162 at the end close to the injection port 10 to be folded inward and accommodated in the container cavity 14 of the second intermediate portion 162 at the position close to the center, simultaneously pushes the intermediate container wall 164 of the first intermediate portion 161 at the end remote from the injection port 10 to be folded inward and accommodated in the container cavity 14 of the first intermediate portion 161 at the position close to the center, and the front portion 11 pushes the intermediate container wall 164 of the first intermediate portion 161 at the end close to the injection port 10 to be folded inward and accommodated in the container cavity 14 of the first intermediate portion 161 at the position close to the center, thereby changing the volume of, thereby pushing the flushing fluid into the inner cavity 14 of the container to complete the catheter flushing.

The intermediate portion 16 has an axial length not less than the axial length of the rear portion 12 and the front portion 11. The above arrangement not only ensures that the first intermediate portion 161 has a sufficient length to be pushed by the front portion 11 and the third intermediate portion 163 for the folding, but also ensures that the third intermediate portion 163 has a sufficient length to push the first intermediate portion 161 and the second intermediate portion 162, and also ensures that the second intermediate portion 162 has a sufficient length to be pushed by the third intermediate portion 163 and the rear portion 12 for the folding, which effectively reduces the volume of the container cavity 14 after injection, and further reduces the residual amount of the flushing fluid in the container cavity 14.

Preferably, a distance 4 from the inner wall of the first intermediate portion 161 to the outer wall of the front portion 11 in the radial direction of the cylindrical container 1 is not less than a wall thickness of the folded portion of the first intermediate portion 161, a distance 4 from the inner wall of the first intermediate portion 161 to the outer wall of the third intermediate portion 163 in the radial direction of the cylindrical container 1 is not less than a wall thickness of the folded portion of the first intermediate portion 161, a distance 4 from the outer wall of the third intermediate portion 163 to the inner wall of the second intermediate portion 162 in the radial direction of the cylindrical container 1 is not less than a wall thickness of the folded portion of the second intermediate portion 162, and a distance 4 from the inner wall of the second intermediate portion 162 to the outer wall of the rear portion 12 in the radial direction of the cylindrical container 1 is not less than a wall thickness of. The above arrangement ensures that there is sufficient clearance between the inner wall of the first intermediate section 161 and the outer wall of the front section 11 to accommodate the wall thickness of the folded portion of the first intermediate section 161, sufficient clearance between the inner wall of the first intermediate section 161 and the outer wall of the third intermediate section 163 to accommodate the wall thickness of the folded portion of the first intermediate section 161, sufficient clearance between the outer wall of the third intermediate section 163 and the inner wall of the second intermediate section 162 to accommodate the wall thickness of the folded portion of the second intermediate section 162, and sufficient clearance between the inner wall of the second intermediate section 162 and the outer wall of the rear section 12 to accommodate the wall thickness of the folded portion of the second intermediate section 162.

Preferably, the wall thickness of the transition portion 13 of the transition container wall 153 is smaller than both the wall thickness of the intermediate container wall 164 of the first intermediate portion 161 and the wall thickness of the rear container wall 152 of the second intermediate portion 162, the transition portion 13 with a thinner wall thickness is more easily folded, effectively reducing the resistance of the front portion 11 to pushing the first intermediate portion 161 to start folding, the resistance of the third intermediate portion 163 to pushing the first intermediate portion 161 and the second intermediate portion 162 to start folding, and the resistance of the rear portion 12 to pushing the second intermediate portion 162 to start folding. The transition portion 13 is provided with a pre-folded portion, the transition portion 13 connecting the front portion 11 and the first intermediate portion 161 is pre-folded inward and is accommodated in the container cavity 14 of the first intermediate portion 161, the transition portion 13 connecting the first intermediate portion 161 and the third intermediate portion 163 is pre-folded inward and is accommodated in the container cavity 14 of the first intermediate portion 161, the transition portion 13 connecting the third intermediate portion 163 and the second intermediate portion 162 is pre-folded inward and is accommodated in the container cavity 14 of the second intermediate portion 162, the transition portion 13 connecting the second intermediate portion 162 and the rear portion 12 is pre-folded inward and is accommodated in the container cavity 14 of the second intermediate portion 162, the above arrangement is effective to reduce the resistance of the intermediate container wall 164 at both ends of the first intermediate portion 161 from being folded, and the resistance of the intermediate container wall 164 at both ends of the second intermediate portion 162 from being folded inward, thereby ensuring that the first intermediate portion 161 is folded by the intermediate container walls 164 at both ends and that the second intermediate portion 162 is folded by the intermediate container walls 164 at both ends, thereby ensuring the reliability and smoothness of the flushing start.

Preferably, the front portion 11, the third middle portion 163 and the rear portion 12 are made of a foldable flexible material, and the first middle portion 161 and the second middle portion 162 are made of a medical plastic material. The front section 11, the third intermediate section 163 and the rear section 12 are therefore more easily pushed over relative to the first intermediate section 161 and the second intermediate section 162. When the rear portion 12 is manually pushed toward the injection port 10, the second intermediate portion 162 reversely pushes the rear container wall 152 of the rear portion 12 near the end of the injection port 10 to be folded outwardly and accommodated in the container cavity 14 of the second intermediate portion 162 near the center, while urging the intermediate container wall 164 of the third intermediate portion 163 at the end remote from the injection port 10 to fold outwardly and be received in the container cavity 14 of the second intermediate portion 162 at a location proximate to the center, the first intermediate portion 161 oppositely urges the intermediate container wall 164 of the third intermediate portion 163 at the end proximate to the injection port 10 to fold outwardly and be received in the container cavity 14 of the first intermediate portion 161 at a location proximate to the center, while pushing the front container wall 151 of the front portion 11 away from the end of the injection port 10 outwardly and into the container cavity 14 of the first intermediate portion 161 near the center, thereby changing the volume of the container lumen 14 and thereby pushing the container lumen 14 of the flushing fluid to complete the catheter flush. The intermediate portion 16 has an axial length not less than the axial length of the rear portion 12 and the front portion 11. The above arrangement ensures that not only first intermediate portion 161 has a sufficient length for pushing front portion 11 and third intermediate portion 163, but also third intermediate portion 163 has a sufficient length to be pushed by first intermediate portion 161 and second intermediate portion 162 for turning, and second intermediate portion 162 has a sufficient length for pushing third intermediate portion 163 and rear portion 12, thereby effectively reducing the residual amount of flushing fluid in container interior 14.

It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.

Claims (24)

1. The flushing injector is characterized by comprising a cylindrical container (1), wherein flushing liquid is pre-filled in the cylindrical container (1), an injection port (10) for injecting the flushing liquid is formed in the cylindrical container (1), and at least part of a container wall (15) of the cylindrical container (1) is a flexible wall capable of being folded.

2. The flush syringe according to claim 1, characterized in that the injection port (10) is arranged at one end of the cylindrical container (1) or at a side wall of the cylindrical container (1).

3. The flush syringe according to claim 2, characterized in that the injection port (10) is arranged at one end of the cylindrical container (1), the cylindrical container (1) being cylindrical; or the injection port (10) is arranged at one end of the columnar container (1), the columnar container (1) is in a circular truncated cone shape, and the diameter of the columnar container (1) is gradually increased or gradually reduced from one end far away from the injection port (10) to one end close to the injection port (10).

4. The flush syringe according to claim 2, characterized in that the injection port (10) is provided in a side wall of the cylindrical container (1), the cylindrical container (1) being cylindrical; or the injection port (10) is arranged on the side wall of the columnar container (1), and the diameter of the columnar container (1) is gradually increased or reduced from the position of the injection port (10) to the two ends of the columnar container (1).

5. The flush syringe according to claim 2, characterized in that the injection port (10) is arranged at one end of the cylindrical container (1), the cylindrical container (1) being prismatic; or the injection port (10) is arranged at one end of the columnar container (1), the columnar container (1) is in a prismoid shape, and the diameter of the columnar container (1) is gradually increased or gradually reduced from one end far away from the injection port (10) to one end close to the injection port (10).

6. The flush syringe according to claim 2, characterized in that the injection port (10) is arranged at one end of the cylindrical container (1), the cylindrical container (1) being a stepped cylinder; the cylindrical container (1) is provided with a front part (11) close to an injection port (10), a rear part (12) far away from the injection port (10) and a transition part (13) connecting the front part (11) and the rear part (12), the diameter of the front part (11) is different from that of the rear part (12), at least part of a front container wall (151) of the front part (11) and/or a rear container wall (152) of the rear part (12) is a flexible wall capable of being folded, and the transition part (13) is used for assisting the front container wall (151) of the front part (11) and/or the rear container wall (152) of the rear part (12) to be folded.

7. The flush syringe according to claim 6, characterized in that the rear container wall (152) of the rear section (12) and the front container wall (151) of the front section (11) have different wall thicknesses.

8. The flush syringe according to claim 6, characterized in that the outer wall of the front part (11) and/or the outer wall of the rear part (12) is provided with a plurality of ribs (121) extending in the axial direction of the cylindrical container (1), and the ribs (121) are uniformly distributed on the outer wall of the front part (11) and/or the outer wall of the rear part (12).

9. The flush syringe according to claim 6, characterized in that the wall thickness of the transition container wall (153) of the transition portion (13) is smaller than the wall thickness of the front container wall (151) of the front portion (11) of the cylindrical container (1); or the wall thickness of the transition container wall (153) of the transition portion (13) is smaller than the wall thickness of the rear container wall (152) of the rear portion (12) of the cylindrical container (1); alternatively, the wall thickness of the transition container wall (153) of the transition portion (13) is smaller than both the wall thickness of the front container wall (151) of the front portion (11) and the wall thickness of the rear container wall (152) of the rear portion (12).

10. The flush syringe according to claim 6, characterized in that the transition portion (13) has at least one turn of outwardly bulging (131), the wall thickness of the transition container wall (153) of the bulging (131) being smaller than both the wall thickness of the front container wall (151) of the front portion (11) and the wall thickness of the rear container wall (152) of the rear portion (12).

11. The flush syringe according to claim 6, characterized in that the diameter of the rear part (12) is smaller than the diameter of the front part (11), the distance (4) of the inner wall of the front part (11) in the radial direction of the cylindrical container (1) to the outer wall of the rear part (12) being not smaller than the wall thickness of the flexible wall that can be folded over; or the diameter of the front part (11) is smaller than that of the rear part (12), and the distance (4) from the inner wall of the rear part (12) to the outer wall of the front part (11) along the radial direction of the columnar container (1) is not smaller than the wall thickness of the foldable flexible wall.

12. A flush syringe according to claim 6, characterized in that the cylindrical container (1) has a section of intermediate portion (16) between the front portion (11) and the rear portion (12), the diameter of the front portion (11) and the diameter of the intermediate portion (16) being different, the diameter of the intermediate portion (16) and the diameter of the rear portion (12) being different, the two ends of the intermediate portion (16) being connected to the front portion (11) and the rear portion (12) respectively by the transition portion (13).

13. The flush syringe according to claim 12, characterized in that the intermediate container wall (164) of the intermediate portion (16) is at least partially the flexible wall that can be folded over; and/or the wall thickness of the front container wall (151) of the front portion (11) and the wall thickness of the middle container wall (164) of the middle portion (16) are different, and the wall thickness of the middle container wall (164) of the middle portion (16) and the wall thickness of the rear container wall (152) of the rear portion (12) are different.

14. The flush syringe according to claim 12, characterized in that the diameter of the front portion (11), the diameter of the intermediate portion (16) and the diameter of the rear portion (12) decrease in sequence; or the diameter of the front portion (11), the diameter of the intermediate portion (16) and the diameter of the rear portion (12) increase in the order named; or, the diameter of the front portion (11) and the diameter of the rear portion (12) are both smaller than the diameter of the intermediate portion (16); alternatively, the diameter of the front portion (11) and the diameter of the rear portion (12) are both larger than the diameter of the intermediate portion (16).

15. The flush syringe according to claim 14, characterized in that the diameter of the front portion (11) and the diameter of the intermediate portion (16) are arranged such that the flexible wall that can be folded back can be accommodated between the front portion (11) and the intermediate portion (16) in the radial direction of the cylindrical container (1) after being folded back, and the diameter of the rear portion (12) and the diameter of the intermediate portion (16) are arranged such that the flexible wall that can be folded back can be accommodated between the rear portion (12) and the intermediate portion (16) in the radial direction of the cylindrical container (1) after being folded back.

16. The flush syringe according to claim 6, characterized in that the cylindrical container (1) has a plurality of sections of intermediate portion (16) between the front portion (11) and the rear portion (12), the sections of intermediate portion (16) being connected to each other by the transition portion (13), the front portion (11) being connected to the adjacent intermediate portion (16) by the transition portion (13), the rear portion (12) being connected to the adjacent intermediate portion (16) by the transition portion (13).

17. The flush syringe according to claim 16, characterized in that the intermediate portion (16) is divided into a first intermediate portion (161) close to the front portion (11) and a second intermediate portion (162) close to the rear portion (12), the first intermediate portion (161) having a different diameter than the second intermediate portion (162), at least part of the container wall of the first intermediate portion (161) and/or the container wall of the second intermediate portion (162) being said flexible wall that can be folded over; or the intermediate portion (16) is divided into a first intermediate portion (161) near the front portion (11), a second intermediate portion (162) near the rear portion (12) and a third intermediate portion (163) between the first intermediate portion (161) and the second intermediate portion (162), the diameter of the first intermediate portion (161) and the diameter of the third intermediate portion (163) are different, the diameter of the second intermediate portion (162) and the diameter of the third intermediate portion (163) are different, at least part of the container walls of the first intermediate portion (161) and the second intermediate portion (162) is the flexible wall that can be folded, or at least part of the third intermediate portion (163) is the flexible wall that can be folded.

18. The flush syringe according to claim 17, characterized in that the diameters of the first intermediate portion (161) and the second intermediate portion (162) are such that the flexible wall that can be folded back can be accommodated between the first intermediate portion (161) and the second intermediate portion (162) in the radial direction of the cylindrical container (1); or, the diameters of the first intermediate part (161) and the third intermediate part (163) are set such that the foldable flexible wall can be accommodated between the first intermediate part (161) and the third intermediate part (163) in the radial direction of the cylindrical container (1) after being folded, and the diameters of the second intermediate part (162) and the third intermediate part (163) are set such that the foldable flexible wall can be accommodated between the second intermediate part (162) and the third intermediate part (163) in the radial direction of the cylindrical container (1) after being folded.

19. The flush syringe according to any of claims 1 to 18, characterized in that a cover (2) connected with a positive pressure connector is fixed outside the injection port (10), and the inner wall of the cover (2) is provided with an internal thread (21) screwed with the positive pressure connector.

20. The flush syringe according to any of claims 6 to 18, characterized in that the inner wall of the rear part (12) facing the injection opening (10) is provided with a pin (122) extending in the direction of the injection opening (10), the pin (122) being connected to the injection opening (10) by plugging; or a pin (122) extending towards the direction of the injection port (10) is arranged on the inner wall of the rear part (12) opposite to the injection port (10), a pin hole (101) is formed by extending the inner peripheral wall of the injection port (10) towards the pin (122), and the pin (122) is connected with the pin hole (101) in an inserting manner; or a one-way valve (7) is arranged on the inner side of the injection port (10), and the one-way valve (7) allows the flushing liquid in the columnar container (1) to be injected from the injection port (10) and prevents the injected flushing liquid from flowing back into the columnar container (1).

21. The flush syringe according to any one of claims 1 to 18, characterized in that an outwardly extending force application member (102) is fixed outside the injection port (10), and the force application member (102) is conformable to a human hand and is used for assisting a hand to apply force to push the cylindrical container (1) away from one end of the injection port (10) so that the foldable flexible wall is folded to push the flushing liquid to be injected through the injection port (10).

22. The flush syringe according to any of claims 6 to 18, characterized in that the rear part (12) is provided outside with a push member (3), the push member (3) being form-fittingly wrapped outside the rear part (12).

23. The flush syringe according to any one of claims 1 to 18, further comprising a sealing member (8), wherein the sealing member (8) is used for sealing the injection port (10) and preventing the flushing liquid in the cylindrical container (1) from flowing out from the injection port (10) to the outside.

24. A flush syringe according to any of claims 6, 9, 10, 12 and 16, characterized in that the transition portion (13) is provided with a pre-fold.

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