CN211066658U

CN211066658U - Negative pressure syringe

Info

Publication number: CN211066658U
Application number: CN201922007724.XU
Authority: CN
Inventors: 孙雪平
Original assignee: FIRST PEOPLE'S HOSPITAL OF YUHANG DISTRICT HANGZHOU
Current assignee: FIRST PEOPLE'S HOSPITAL OF YUHANG DISTRICT HANGZHOU
Priority date: 2019-11-19
Filing date: 2019-11-19
Publication date: 2020-07-24
Anticipated expiration: 2029-11-19

Abstract

The utility model provides a negative pressure injector relates to the technical field of puncture instrument. The negative pressure injector comprises a vent pipe, a cylindrical needle handle and a needle cylinder which are sequentially sleeved from inside to outside, wherein the vent pipe is fixedly connected with the needle cylinder; the both ends of breather pipe are grafting end and suction end respectively, and the both ends of needle handle are respectively for pressing down end and slip end, and the grafting end of breather pipe is inside the needle handle is stretched into from the slip end, and the end of just pegging graft is equipped with the second sealing member, and the sealed sliding connection of second sealing member is in the inside of needle handle, and the shutoff has first sealing member between needle handle and the breather pipe, and the needle handle is located the regional sealed chamber that forms between first sealing member and the second sealing member, and the pipeline section that the breather pipe is located sealed chamber is equipped with the through-hole. The negative pressure injector is convenient and fast to use.

Description

Negative pressure syringe

Technical Field

The utility model belongs to the technical field of puncture instrument technique and specifically relates to a negative pressure syringe is related to.

Background

Puncture is a diagnosis and treatment technology for puncturing a puncture needle into a body cavity of a patient to extract secretion for testing or injecting medicine into the body cavity, and is mainly used for blood drawing testing, blood transfusion, fluid infusion and the like. For a patient needing multiple times of venipuncture operations, in order to reduce pain caused by repeated puncture on the patient, an indwelling needle is generally used clinically, in order to improve the success rate of puncture of the indwelling needle, a syringe is generally used for assisting puncture at the end interface of the indwelling needle, specifically, the syringe is used for sucking outwards to promote venous blood to flow out, so that medical personnel can master the condition that the venous indwelling needle punctures into a blood vessel at the first time. However, when the existing syringe is used, the needle handle needs to be pulled outwards to generate a suction effect, and the medical staff cannot complete the pulling operation with a single hand in the actual puncture operation, so that the operation is assisted by two hands or an assistant, and the use convenience is poor.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a negative pressure syringe to when alleviating the syringe that exists among the prior art and being used for the suction, the operation is drawn to the unable completion of one hand, needs both hands operation or assistant to assist the operation, uses the relatively poor technical problem of convenient degree.

The embodiment provides a negative pressure injector, which comprises a vent pipe, a cylindrical needle handle and a needle cylinder, wherein the vent pipe, the cylindrical needle handle and the needle cylinder are sequentially sleeved from inside to outside;

the both ends of breather pipe are grafting end and suction end respectively, the both ends of needle handle are for pressing down end and slide end respectively, the grafting end of breather pipe certainly the slide end stretches into inside the needle handle, just the grafting end is equipped with the second sealing member, the sealed sliding connection of second sealing member in the inside of needle handle, the needle handle with the shutoff has first sealing member between the breather pipe, the needle handle is located first sealing member with regional sealed chamber that forms between the second sealing member, the breather pipe is located the pipeline section in sealed chamber is equipped with the through-hole.

In an optional embodiment, the needle cylinder is provided with a guide plate, the guide plate is provided with a guide hole, and the needle handle is inserted into the guide hole in a sliding manner.

In an alternative embodiment, the outer wall of the needle handle is provided with a catch extending outwards, and the catch is arranged obliquely from inside to outside towards the pressing end.

In an optional embodiment, a clamping groove is formed between the side wall of the buckle facing the needle handle and the outer wall of the needle handle, and a clamping head is arranged on the hole wall of the guide hole and matched with the clamping groove.

In an optional embodiment, a connecting plate is fixedly arranged at one end of the needle cylinder, which is far away from the needle handle, the vent pipe is fixedly connected with the connecting plate, and the suction end penetrates through the connecting plate to extend out.

In optional embodiment, one side that the connecting plate deviates from the needle handle is equipped with annular connector, the breather pipe is located the intra-annular of connector, just the breather pipe the connecting plate with the connector forms the ring channel.

In an alternative embodiment, a flange is arranged at one end of the needle cylinder facing the needle handle.

In an alternative embodiment, the sliding end of the needle handle is positioned inside the needle cylinder, the first sealing element is arranged at the end part of the sliding end, and the outer edge of the first sealing element is in sliding contact with the inner wall of the needle cylinder; the first sealing member divides an inner space of the cylinder into two chambers, both of which communicate with the outside.

In an optional embodiment, a pressing plate is arranged at the pressing end of the needle handle, the pressing plate is provided with a first vent hole, and the first vent hole is communicated with the inner space and the outer space of the needle handle.

In an optional embodiment, a through hole of the vent pipe is plugged with a plugging piece, the plugging piece is provided with a filter hole for communicating the vent pipe with the sealed cavity, and the filter hole can be plugged by the plugging piece after water absorption expansion.

The utility model discloses negative pressure syringe's beneficial effect includes:

the utility model provides a negative pressure injector, which comprises a breather pipe for suction, a needle handle of a sealed cavity for an operator to press to form negative pressure, and a needle cylinder for the operator to hold and fix the breather pipe; wherein, the vent pipe is fixedly connected with the syringe. When the device is used, an operator holds the needle cylinder, the suction end of the vent pipe extends into a medium to be sucked, the pressing end of the needle handle is pressed towards the needle cylinder, the needle cylinder is static relative to the hand part under the fixation of the hand part of the operator, the vent pipe is fixedly arranged on the needle cylinder and is also static relative to the hand part, and the second sealing element at the insertion end of the vent pipe is also static relative to the hand part; the needle handle moves towards the needle cylinder under the pressing action, correspondingly, the needle handle pushes the first sealing piece to move towards the needle cylinder, and in the process, the first sealing piece slides along the vent pipe; the second sealing element is approximately fixed at the inserting end of the vent pipe, the distance between the first sealing element and the second sealing element is increased along with the movement of the needle handle towards the needle cylinder, the volume of a sealing cavity of the needle handle between the first sealing element and the second sealing element is correspondingly increased, the pressure of the sealing cavity is reduced to be in a negative pressure state, and the sealing cavity is communicated with the inner cavity of the vent pipe through the through hole in the vent pipe, so that an external medium is promoted to enter the vent pipe and enter the sealing cavity through the through hole.

This negative pressure syringe enlarges the volume in sealed chamber through pressing the needle handle, make sealed chamber be the negative pressure state, and then produce suction to the medium of breather pipe intercommunication, make the medium get into breather pipe and sealed intracavity, realize the suction of syringe, and the operating personnel one hand can realize that the operation of above-mentioned handheld cylinder presses the needle handle simultaneously, thereby make operating personnel can one-hand operation negative pressure syringe when carrying out operations such as puncture, another hand then is used for the fixed to patient affected part or other part, and then improves the convenient degree of use of syringe.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is an internal schematic view of a negative pressure syringe according to an embodiment of the present invention in a first configuration;

fig. 2 is an internal schematic view of a negative pressure syringe according to an embodiment of the present invention in a second configuration;

fig. 3 is an internal schematic view of a negative pressure syringe according to a third configuration of the present invention;

FIG. 4 is an enlarged view of part A of FIG. 3;

FIG. 5 is a schematic view of the structure of the guide plate of FIG. 2;

fig. 6 is a partial schematic view illustrating a connection between a vent pipe and a connector of the negative pressure syringe according to an embodiment of the present invention;

fig. 7 is a partial schematic view illustrating a vent pipe of the negative pressure syringe according to an embodiment of the present invention when a plugging member is disposed thereon;

FIG. 8 is an internal view of the negative pressure syringe of FIG. 3 in a first pumping state;

fig. 9 is an internal schematic view of the negative pressure syringe of fig. 3 in a second pumping state.

Icon: 100-a breather pipe; 110-a plug end; 120-a suction end; 130-a through hole; 200-needle handle; 210-a pressing end; 220-sliding end; 230-a sealed cavity; 240-buckling; 250-a clamping groove; 260-a pressure plate; 261-a first vent; 300-syringe; 310-flanging; 400-a first seal; 500-a second seal; 600-a guide plate; 610-a guide hole; 620-card connector; 630-a second vent; 700-connecting plate; 710-a third vent; 800-connecting head; 810-an annular groove; 820-a thread; 900-plugging piece; 910-filtration pores.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "inside" and "outside" are used for indicating the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship that the utility model is usually placed when using, and are only for convenience of describing the present invention and simplifying the description, but not for indicating or implying that the device or element to be referred must have a specific position, be constructed and operated in a specific position, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless explicitly stated or limited otherwise, the terms "disposed," "connected," and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Some embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

The present embodiment provides a negative pressure injector, as shown in fig. 1, which includes a vent tube 100, a cylindrical needle handle 200 and a syringe 300, which are sequentially sleeved from inside to outside, wherein the vent tube 100 is fixedly connected to the syringe 300; the two ends of the vent pipe 100 are respectively an insertion end 110 and a suction end 120, the two ends of the needle handle 200 are respectively a pressing end 210 and a sliding end 220, the insertion end 110 of the vent pipe 100 extends into the needle handle 200 from the sliding end 220, the insertion end 110 is provided with a second sealing member 500, the second sealing member 500 is in sealing sliding connection with the inside of the needle handle 200, a first sealing member 400 is sealed between the needle handle 200 and the vent pipe 100, a sealing cavity 230 is formed in an area of the needle handle 200 between the first sealing member 400 and the second sealing member 500, and a through hole 130 is formed in a pipe section of the vent pipe 100 located in the sealing cavity 230.

The negative pressure injector provided by the embodiment comprises a vent pipe 100 for suction, a needle handle 200 of a sealing cavity 230 for being pressed by an operator to form negative pressure, and a needle cylinder 300 which is held by the operator and used for fixing the vent pipe 100; wherein, the vent pipe 100 is fixedly connected to the syringe 300. When the air purifier is used, an operator holds the syringe 300, the suction end 120 of the vent pipe 100 extends into a medium to be sucked, the pressing end 210 of the needle handle 200 is pressed towards the syringe 300, the syringe 300 is stationary relative to the hand under the fixation of the operator, the vent pipe 100 is fixedly arranged on the syringe 300 and is also stationary relative to the hand, and the second sealing element 500 of the insertion end 110 of the vent pipe 100 is also stationary relative to the hand; the needle handle 200 moves towards the syringe 300 under the pressing action, accordingly, the needle handle 200 pushes the first sealing member 400 to move towards the syringe 300, and in the process, the first sealing member 400 slides along the vent pipe 100; the second sealing member 500 is approximately fixed at the insertion end 110 of the vent pipe 100, the distance between the first sealing member 400 and the second sealing member 500 becomes longer with the movement of the needle handle 200 towards the syringe 300, the volume of the sealing chamber 230 of the needle handle 200 between the first sealing member 400 and the second sealing member 500 becomes larger accordingly, the pressure of the sealing chamber 230 decreases to be in a negative pressure state, and the sealing chamber 230 is communicated with the inner cavity of the vent pipe 100 through the through hole 130 on the vent pipe 100, so that the external medium is promoted to enter the vent pipe 100 and enter the sealing chamber 230 through the through hole 130.

This negative pressure syringe enlarges the volume of sealed chamber 230 through pressing handle of a needle 200, make sealed chamber 230 be the negative pressure state, and then produce suction to the medium of breather pipe 100 intercommunication, make in the medium gets into breather pipe 100 and sealed chamber 230, realize the suction of syringe, and the operating personnel one hand can realize that above-mentioned handheld cylinder 300 presses handle of a needle 200's operation simultaneously, thereby make operating personnel can one-hand operation negative pressure syringe when carrying out operations such as puncture, another hand then is used for the fixed to patient affected part or other part, and then improve the convenient degree of use of syringe.

As shown in fig. 8, the needle handle is pressed to the first position, the distance between the first sealing element and the second sealing element is L1, namely the length of the sealing cavity is L1, the position of the second sealing element is not moved when the needle handle is continuously pressed, the first sealing element moves away from the second sealing element, as shown in fig. 9, the distance between the first sealing element and the second sealing element is L2, namely the length of the sealing cavity is increased from L1 to L2, correspondingly, the volume of the sealing cavity is increased, and the sealing cavity is in a negative pressure state.

Accordingly, the above-mentioned negative pressure syringe may also be used for injection, wherein a liquid such as a drug solution is sucked into the sealed cavity 230 by the above-mentioned pressing operation, and the needle handle 200 is pulled in a direction away from the syringe 300, so that the needle handle 200 drives the first sealing member 400 to move towards the second sealing member 500, and the volume of the sealed cavity 230 is correspondingly reduced, and the drug solution in the sealed cavity 230 is pressed into the vent tube 100 through the through hole 130 on the vent tube 100 and then is output from the suction end 120 of the vent tube 100. Specifically, the gauge of the negative pressure syringe may be 5 ml.

In this embodiment, as shown in fig. 2, a guide plate 600 may be provided on the cylinder 300, the guide plate 600 may be provided with a guide hole 610, and the needle holder 200 may be slidably inserted into the guide hole 610. During the process of pressing or pulling the needle handle 200 to move towards or away from the syringe 300, the guide hole 610 on the guide plate 600 guides the movement of the needle handle 200, so as to improve the coaxiality of the movement process of the needle handle 200 and the vent pipe 100, correspondingly improve the sealing matching degree between the first sealing element 400 and the vent pipe 100 and between the second sealing element 500 and the needle handle 200, and reduce the damage to the vent pipe 100 caused by the bending force applied to the vent pipe 100 by the deviation of the needle handle 200.

In this embodiment, as shown in fig. 2-4, a catch 240 extending outward may be disposed on an outer wall of the needle handle 200, and the catch 240 is disposed obliquely from inside to outside toward the pressing end 210. Initially, some or all of the needle handles 200 are located outside the guide plate 600, when the negative pressure injector is used, the needle handles 200 are pressed toward the syringe 300, the needle handles 200 synchronously move the catch 240 toward the guide plate 600, when the catch 240 reaches the position of the guide hole 610, the needle handles 200 are continuously pressed, since the catch 240 is inclined from the inside to the outside toward the pressing end 210 of the needle shaft 200, the catch 240 gradually presses the hole wall of the guide hole 610 outward until the catch 240 passes through the guide hole 610, at which time, the end of the catch 240 facing the pressing end 210 of the needle lever 200 forms a backstop end, and the needle lever 200 cannot pass through the guide hole 610 in the reverse direction (in the direction away from the needle lever 200) due to the blocking action of the backstop end of the catch 240, so that the needle lever 200 can move only in the direction toward the needle cylinder 300, that is, the operator can only press the needle handle 200, so as to ensure the disposable use of the negative pressure injector and reduce the potential safety and sanitation hazards caused by the repeated use of the negative pressure injector to the patient.

Alternatively, as shown in fig. 2 and 3, the plurality of sets of the clasps 240 may be provided, and the plurality of sets of the clasps 240 are arranged at intervals along the axial direction of the needle handle 200; each group of the fasteners 240 may be an annular boss or a plurality of chucks arranged along the circumferential direction of the needle handle 200 at intervals. The arrangement length of the plurality of groups of buckles 240 along the needle handle 200 is the length of the buckles 240 capable of locking the needle handle 200, and the arrangement of the plurality of groups of buckles 240 can greatly prolong the locking length of the buckles 240 to the needle handle 200, so that the unidirectional movement of the needle handle 200 is further ensured.

In this embodiment, as shown in fig. 3 and 4, a clamping groove 250 is formed between the side wall of the buckle 240 facing the needle handle 200 and the outer wall of the needle handle 200, a clamping head 620 is arranged on the hole wall of the guide hole 610, and the clamping head 620 is matched with the clamping groove 250. On one hand, the clamping groove 250 formed between the clamp 240 and the needle handle 200 can be used as a space for the clamp 240 to deform under stress, and when the clamp 240 and the hole wall of the guide hole 610 generate extrusion, the clamp 240 is subjected to an acting force towards the needle handle 200 and deforms towards the needle handle 200, so that the clamp 240 can conveniently pass through the guide hole 610, and the use convenience of the negative pressure injector is correspondingly improved; on the other hand, after the buckle 240 is pressed through the guide hole 610, if the needle handle 200 is pulled away from the needle cylinder 300, the clamping head 620 on the guide plate 600 is clamped into the clamping groove 250, so as to further ensure the blocking effect of the guide plate 600 on the buckle 240 and accordingly ensure the non-return effect on the needle handle 200. Specifically, as shown in fig. 4, the latch 240 may be an inclined plate body extending outward, and a 45 ° angle latch groove 250 is formed between the inclined plate body and the needle handle 200, and accordingly, the latch head 620 is also 45 ° angle.

In this embodiment, as shown in fig. 2, one end of the syringe 300 away from the needle handle 200 may be fixedly connected to a connection plate 700, the vent tube 100 is fixedly connected to the connection plate 700, and the suction end 120 extends through the connection plate 700. Here, the operation principle of the specific form of the fastening of the vent pipe 100 and the syringe 300 is described in detail above, and will not be described herein again. It should be noted that, when the guide plate 600 and the connection plate 700 are simultaneously disposed at two ends of the syringe 300, if a gap is left between the first sealing member 400 and the syringe 300, the guide plate 600 and the connection plate 700 are not limited; if the sliding end 220 of the needle handle 200 is located inside the syringe 300, the first sealing member 400 is located at the end of the sliding end 220, and the outer edge of the first sealing member 400 is in sliding contact with the inner wall of the syringe 300; the first sealing member 400 divides the inner space of the cylinder 300 into two chambers, which are both required to be communicated with the outside, and particularly, the first sealing member 400 divides the space inside the cylinder 300 between the guide plate 600 and the connecting plate 700 into a first chamber and a second chamber, which are both changed in volume when the needle handle 200 moves, and are both communicated with the outside atmosphere, so that the inside of the first chamber and the second chamber is always at approximately atmospheric pressure, thereby ensuring the movement of the first sealing member 400 inside the cylinder 300. Alternatively, as shown in fig. 5, a second vent hole 630 may be provided on the guide plate 600, and as shown in fig. 1, a third vent hole 710 may be provided on the connection plate 700.

Alternatively, both the first and

second seals

400 and 500 may be rubber or silicone.

In this embodiment, as shown in fig. 3, an annular connector 800 may be disposed on a side of the connecting plate 700 away from the needle handle 200, the vent tube 100 is located in the ring of the connector 800, and the vent tube 100, the connecting plate 700 and the connector 800 form an annular groove 810. The connector 800 is used for connecting with a tail connector of the indwelling needle so as to improve the convenience of connection between the connector and the indwelling needle; an annular groove 810 is formed between the vent pipe 100, the connecting plate 700 and the connector 800, and when in use, firstly, the connector 800 of the negative pressure injector is connected with the tail joint of the indwelling needle, the suction end 120 of the vent pipe 100 is positioned in the space formed by the connection of the connector 800 and the tail joint of the indwelling needle, after the needle head of the indwelling needle is punctured into the artery of the patient, the negative pressure is formed in the sealing cavity 230 by pressing the needle handle 200, and correspondingly, the negative pressure is formed in the vent pipe 100 and the tube body of the indwelling needle communicated with the tail connector, when the needle puncture is successful, the blood in the vein of the patient can be promoted to enter the tube body of the indwelling needle, the annular groove 810 formed between the connector 800 and the vent pipe 100 through the needle, and then enter into the breather pipe 100, operating personnel can discern the state of whether the puncture of indwelling needle is successful or not through observing the state of bleeding in the breather pipe 100, improves the success rate of puncture.

Alternatively, as shown in fig. 6, threads 820 may be provided on the outer or inner wall of the connector 800, and accordingly, the tail connector of the indwelling needle is threadedly engaged with the connector 800. Specifically, the connector 800, the connecting plate 700, the vent pipe 100 and the syringe 300 may be fixed to each other or integrally formed.

In this embodiment, as shown in fig. 3, 8 and 9, a flange 310 may be provided outwardly at an end of the syringe 300 facing the needle holder 200. When the negative pressure injector is used by an operator, the barrel body of the needle barrel 300 can be clamped by two fingers (other fingers different from the thumb), the thumb is used for pressing the needle handle 200, the needle handle 200 applies pressing acting force to the needle barrel 300, the flanging 310 serves as a force application point of reaction force opposite to the pressing acting force applied to the needle barrel 300 by the two fingers, the needle barrel 300 needs to be clamped forcefully by the operator to ensure the pressing movement of the needle handle 200, after the flanging 310 is arranged, the acting force of the two fingers of the operator on the needle barrel 300 is greatly reduced, and therefore the convenience in use of the negative pressure injector is improved. Specifically, the flange 310 may be a circle arranged around the circumference of the syringe 300, or may be two outer edges, and the positions of the two outer edges correspond to the positions of the two fingers.

In this embodiment, as shown in fig. 3, 8 and 9, a pressing plate 260 may be provided at the pressing end 210 of the needle shaft 200, the pressing plate 260 may be provided with a first vent hole 261, and the first vent hole 261 communicates the inner space of the needle shaft 200 with the outside. The operator can exert the pressing force on the needle handle 200 by pressing the pressing plate 260, and the arrangement of the pressing plate 260 can increase the contact area between the needle handle 200 and the operator compared with the direct pressing of the pressing end 210 of the needle handle 200, thereby improving the comfort of the operator during operation. A cavity is formed between the pressing plate 260 and the second sealing element 500, a first vent hole 261 is formed in the pressing plate 260 to ensure that the cavity is communicated with the outside, when the second sealing element 500 moves, the volume of the cavity changes to cause the obstruction of the air pressure change to the second sealing element 500 and further to the movement of the needle handle 200, and the movement of the needle handle 200 is ensured.

In this embodiment, as shown in fig. 2, 3 and 7, a blocking member 900 may be disposed at the through hole 130 of the vent pipe 100, the blocking member 900 is provided with a filtering hole 910 for communicating the vent pipe 100 with the sealing cavity 230, and the blocking member 900 can block the filtering hole 910 by water absorption and expansion. Taking the indwelling needle puncture as an example, when blood does not enter the ventilation tube 100, the filtering hole 910 of the blocking piece 900 is in a through state, and the sealing cavity 230 is communicated with the ventilation tube 100 to ensure the suction effect of the sealing cavity 230 on the blood through the ventilation tube 100; when blood enters the ventilation tube 100 and reaches the through hole 130 of the ventilation tube 100, the blood contacts the plugging piece 900, the plugging piece 900 absorbs water molecules in the blood to expand, the filtering hole 910 is plugged, namely, the plugging piece 900 absorbs water to plug the through hole 130, and the sealing cavity 230 and the interior of the ventilation tube 100 are separated into two independent cavities, so that the backflow amount of the blood of a patient is effectively reduced on the basis of facilitating an operator to identify the flowing state of the blood in the ventilation tube 100, and discomfort caused by excessive bleeding of the patient is reduced on the basis of completing puncture of an indwelling needle. Specifically, the blocking member 900 may be made of a material capable of absorbing water and expanding, such as water-absorbent expanded cotton; in addition, a porous stone may be directly selected as the block piece 900.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present invention.

Claims

1. A negative pressure injector is characterized by comprising a vent pipe (100), a cylindrical needle handle (200) and a needle cylinder (300) which are sequentially sleeved from inside to outside, wherein the vent pipe (100) is fixedly connected with the needle cylinder (300);

the two ends of the breather pipe (100) are respectively an inserting end (110) and a suction end (120), the two ends of the needle handle (200) are respectively a pressing end (210) and a sliding end (220), the inserting end (110) of the breather pipe (100) extends into the needle handle (200) from the sliding end (220), the inserting end (110) is provided with a second sealing element (500), the second sealing element (500) is in sealed sliding connection with the inside of the needle handle (200), the needle handle (200) is sealed with a first sealing element (400) between the breather pipe (100), the needle handle (200) is located in the first sealing element (400) and an area between the second sealing element (500) forms a sealing cavity (230), and the breather pipe section of the sealing cavity (230) is provided with a through hole (130).

2. The negative pressure syringe according to claim 1, wherein the cylinder (300) is provided with a guide plate (600), the guide plate (600) is provided with a guide hole (610), and the needle handle (200) is slidably inserted into the guide hole (610).

3. The negative pressure syringe according to claim 2, wherein the outer wall of the needle handle (200) is provided with a catch (240) extending outward, and the catch (240) is inclined from inside to outside toward the pressing end (210).

4. The negative pressure syringe of claim 3, wherein a clamping groove (250) is formed between a side wall of the buckle (240) facing the needle handle (200) and an outer wall of the needle handle (200), and a clamping head (620) is arranged on a hole wall of the guide hole (610), and the clamping head (620) is matched with the clamping groove (250).

5. The negative-pressure injector according to any one of claims 1 to 4, wherein a connecting plate (700) is fixedly arranged at one end of the needle cylinder (300) facing away from the needle handle (200), the vent pipe (100) is fixedly connected with the connecting plate (700), and the suction end (120) extends out through the connecting plate (700).

6. The negative pressure syringe of claim 5, wherein one side of the connecting plate (700) facing away from the needle handle (200) is provided with an annular connector (800), the vent pipe (100) is located in the ring of the connector (800), and the vent pipe (100), the connecting plate (700) and the connector (800) form an annular groove (810).

7. The negative pressure injector of any one of claims 1-4, wherein the end of the needle cylinder (300) facing the needle handle (200) is provided with a flange (310) outward.

8. The negative pressure syringe according to any one of claims 1 to 4, wherein the sliding end (220) of the needle handle (200) is located inside the syringe (300), the first sealing member (400) is arranged at the end of the sliding end (220), and the outer edge of the first sealing member (400) is in sliding contact with the inner wall of the syringe (300); the first sealing member (400) divides the inner space of the cylinder (300) into two chambers, both of which communicate with the outside.

9. The negative pressure syringe according to claim 8, wherein the pressing end (210) of the needle handle (200) is provided with a pressing plate (260), the pressing plate (260) is provided with a first vent hole (261), and the first vent hole (261) communicates the inner space of the needle handle (200) with the outside.

10. The negative-pressure injector according to any one of claims 1 to 4, characterized in that a blocking piece (900) is blocked at the through hole (130) of the vent pipe (100), the blocking piece (900) is provided with a filtering hole (910) for communicating the vent pipe (100) and the sealing cavity (230), and the blocking piece (900) can block the filtering hole (910) by water absorption expansion.