CN215537304U - Continuous positive pressure venous indwelling needle - Google Patents

Abstract

The utility model discloses a continuous positive pressure venous indwelling needle which comprises a catheter component and a needle tube component which are connected with each other, wherein the catheter component comprises a catheter seat and a catheter which is fixed at the far end of the catheter seat and used for transfusion, the needle tube component at least comprises a needle tube seat and a needle tube, one side of the catheter seat is communicated with a transfusion joint through the positive pressure component, the positive pressure component is a deformation tube made of elastic medical materials, two ends of the deformation tube are respectively fixed with a first catheter and a second catheter through connecting sleeves, the first catheter is provided with a flow stopping clamp which is in flexible contact with the first catheter, the other end of the first catheter is fixed and communicated with the catheter seat, and the other end of the second catheter is fixed and communicated with the transfusion joint. The utility model is provided with the expandable deformation tube, provides continuous positive pressure to ensure that the liquid medicine in the catheter keeps a flowing state all the time, and avoids the formation of thrombus at the top or inside of the catheter.

Description

Continuous positive pressure venous indwelling needle

Technical Field

The utility model relates to the technical field of injection instruments, in particular to a continuous positive pressure venous indwelling needle.

Background

The venous indwelling needle can reduce the pain of a patient caused by repeated venipuncture and the fear of injection, relieve the anxiety of family members, facilitate clinical medication, help emergency medication of critical patients, relieve the workload of nurses and reduce the pain of the patient, so the venous indwelling needle is widely applied clinically.

Chinese patent CN202822325U discloses a venous indwelling needle, which comprises a catheter assembly, a needle tube assembly and an infusion liquid connector assembly, wherein the catheter assembly comprises a three-way catheter holder and a catheter connected to the front end of a first opening of the three-way catheter holder. The needle tube assembly comprises a needle base sleeved outside the third opening of the three-way catheter base and a needle tube connected to the needle base, and the needle tube is inserted into the catheter and the three-way catheter base. The second opening of the three-way catheter seat is connected with an infusion liquid joint component, and the infusion liquid joint component comprises a long catheter, a flow stopping clamp, an infusion joint, a heparin cap, an end cap and the like; the second opening of the three-way catheter base is connected with a long catheter, a flow stopping clamp is arranged on the long catheter, and the other end of the long catheter is connected to an infusion connector; one side of the infusion joint is provided with a heparin cap, and the other side of the infusion joint is connected with an end cap; the infusion set can be inserted into the heparin cap for infusion of the normal saline. When the venous indwelling needle is used, the flow stopping clamp is required to be in an open state, and infusion is carried out by matching the infusion device with a heparin cap or an end cap; after the transfusion is finished, one side of the transfusion joint is sealed through the end cap, and the other side pushes the normal saline in the transfusion joint through the transfusion device connected to the heparin cap so as to wash the inner cavity of the vein indwelling needle; after the flushing is finished, external force is applied to close the flow stopping clamp, and the boss of the flow stopping clamp clamps the long guide pipe and enables the long guide pipe to be in a flow cutoff state.

The venous indwelling needle in the prior art can be pulled away after infusion is completed, and because a human vein has certain blood pressure, the blood can flow back to the catheter, and platelet precipitation can be irradiated for a long time to promote thrombosis because the blood in the catheter is in a negative pressure state, or the thrombus can enter a patient body along with liquid medicine when the next infusion is performed, so that unnecessary medical accidents are caused.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects in the prior art and provide a continuous positive pressure venous indwelling needle.

The purpose of the utility model is realized by the following technical scheme:

last malleation vein indwelling needle, catheter subassembly and needle tubing subassembly including interconnect, the catheter subassembly includes the pipe seat and fixes at its distal end, is used for the pipe of infusion, the needle tubing subassembly includes needle tube seat and needle tubing at least, the near-end of needle tubing is inserted and is located in the needle tube seat and reciprocal anchorage, the distal end of needle tubing passes the cavity inside of pipe stretches out, the one side of pipe seat is passed through malleation subassembly intercommunication infusion and is connected, malleation subassembly is the deformation pipe of making by elastic medical material, the both ends of deformation pipe are fixed with first pipe and second pipe through the adapter sleeve respectively, be provided with the only flow clamp of flexonics with it on the first pipe and its other end with the pipe seat is fixed and communicates, the other end of second pipe with the infusion connects fixedly and communicates.

Preferably, the deformation pipe is made of TPU material and is fixed with the connecting sleeve through ultrasonic welding.

Preferably, in the initial state, the outer diameter of the deformation pipe is larger than the outer diameters of the first guide pipe and the second guide pipe, and the cross sections of the first guide pipe and the second guide pipe are always the same.

Preferably, the flow stopping clip is provided with an elastic arm and a fixed arm which can be clamped with each other, a through hole for allowing the long catheter to pass through is formed at the joint of the upper end and the lower end of the elastic arm and the fixed arm, an elastic block is arranged on the inner side of the fixed arm, and a convex block is arranged on the inner side of the elastic arm and used for limiting the long catheter between the convex block and the elastic block when the elastic arm and the fixed arm are clamped with each other.

Preferably, the inner side of the fixed arm is provided with two limiting blocks, the elastic block is clamped between the two limiting blocks, and the extending end of each limiting block is provided with an arc-shaped notch matched with the outer contour of the long guide pipe so as to fix the position of the long guide pipe.

Preferably, the shape of the elastic block is rectangular, circular or triangular.

Preferably, the tail end of the elastic arm is provided with an outer convex clamping block, the tail end of the fixed arm tilts outwards, and an inner clamping block which can be clamped with the outer clamping block is arranged on the inner wall of a bending part between the tail end of the fixed arm and the fixed arm body; and a group of convex ribs are arranged on the outer sides of the fixed arm and the elastic arm.

Preferably, the number of the inner clamping blocks is two.

Preferably, the inner cavity of the needle tube seat is provided with an isolating plug, and the isolating plug is positioned at the tail end of the needle tube seat.

The utility model has the following beneficial effects:

1. an expansible and deformable deformation tube is connected between the first catheter and the second catheter, so that continuous positive pressure is provided to keep liquid medicine in the catheters in a flowing state all the time, and the top or the inside of the catheters is prevented from forming thrombus to cause medical accidents;

2. the deformation pipe is made of TPU material, so that the deformation pipe has certain elasticity, can expand to a certain degree, and generates continuous positive pressure in the guide pipe in a sealed state;

3. the diameter of the deformation pipe is larger than that of the first guide pipe and the second guide pipe, so that certain liquid medicine can be reserved, and sufficient liquid medicine can always flow in the guide pipes;

4. the deformation pipe and the connecting sleeve are welded through ultrasonic waves, so that the sealing performance between the deformation pipe and the connecting sleeve can be ensured, and the connecting sleeve can improve the strength of the deformation pipe, so that the deformation pipe is effectively connected with the first guide pipe and the second guide pipe;

5. the pipe diameters of the first guide pipe and the second guide pipe are consistent, so that the connecting sleeves at the two ends of the deformation pipe can be kept consistent, the processing and the production are convenient, and the production cost is reduced;

6. the elastic block is made of TPU material and has certain elasticity for contraction, so that after the flow stopping clamp fastens the long catheter, the long catheter is in flexible contact with the elastic block, the flow stopping clamp cannot cause the cut-off of the internal liquid medicine, and the elastic block can enable the liquid medicine in the long catheter to slowly flow at an extremely low flow rate;

7. the flow stopping clamp is provided with two inner clamping blocks, so that the flow stopping clamp can clamp the first conduit to stop the flow of the liquid medicine, the injection is convenient, positive pressure can be generated, and the continuous flow of the liquid medicine is ensured;

8. a needle stick prevention protection assembly is arranged between the catheter seat and the needle tube seat to ensure that the needle tube is sealed after use, so that the needle tube is prevented from extending out to accidentally injure medical care personnel, and the use safety of the utility model is improved.

Drawings

The technical scheme of the utility model is further explained by combining the accompanying drawings as follows:

FIG. 1: a schematic diagram of an embodiment of the utility model;

FIG. 2: a cross-sectional view of an embodiment of the utility model;

FIG. 3: a schematic view of another angle of an embodiment of the present invention;

FIG. 4: an enlarged view of portion a in fig. 2;

FIG. 5: an enlarged view of portion B in fig. 2.

Detailed Description

The present invention will be described in detail below with reference to specific embodiments shown in the drawings. These embodiments are not intended to limit the present invention, and structural, methodical, or functional changes that may be made by one of ordinary skill in the art in light of these embodiments are intended to be within the scope of the present invention.

In the description of the schemes, it should be noted that the terms "center", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the embodiment, the operator is used as a reference, and the direction close to the operator is a proximal end, and the direction away from the operator is a distal end.

As shown in fig. 1 to 5, the present invention discloses a continuous positive pressure venous indwelling needle, which comprises a catheter assembly and a needle tube assembly connected with each other, wherein the catheter assembly comprises a catheter holder 1 and a catheter 2 fixed at the distal end thereof for transfusion, the needle tube assembly at least comprises a needle tube holder 3 and a needle tube 4, the proximal end of the needle tube 4 is inserted into the needle tube holder 3 and fixed with each other, the distal end of the needle tube 4 passes through the hollow interior of the catheter 2 and extends out, one side of the catheter holder 1 is communicated with a transfusion connector 6 through a positive pressure assembly, the positive pressure assembly is a deformation tube 501 made of an elastic medical material, two ends of the deformation tube 501 are respectively fixed with a first catheter 503 and a second catheter 504 through a connecting sleeve 502, the first catheter 503 is provided with a flow stopping clip 8 in flexible contact with the first catheter 503, and the other end of the first catheter is fixed and communicated with the catheter holder 1, the other end of the second conduit 504 is fixed and in communication with the infusion connector 6. Connect a deformation pipe 501 that can expand and deform between first pipe 503 and the second pipe 504, make first pipe 503, deformation pipe 501 and second pipe 504 three link up the setting, accord with the flow direction of liquid medicine, ensure that the liquid medicine circulation in-process can pass through deformation pipe 501 department, and make deformation pipe 501 produces the inflation, makes with providing continuous malleation the inside liquid medicine of pipe 2 keeps the mobile state all the time, avoids the top or the inside thrombus that forms of pipe 2 cause medical accident.

In a preferred embodiment, the deformation pipe 501 is made of TPU, and is fixed to the connection sleeve 502 through ultrasonic welding, and the ultrasonic welding can ensure that the connection between the deformation pipe 501 and the connection sleeve 502 is more reliable and stable and is not easy to break. The deformable tube 501 is made of TPU material, so that it has certain elasticity, can be expanded to a certain extent, and generates a continuous positive pressure inside the catheter 2 in a sealed state. The connecting sleeve 502 improves the strength of the two ends of the deformation pipe 501, so that the deformation pipe 501 can be fixedly connected with the first guide pipe 503 and the second guide pipe 504 conveniently, and in other feasible embodiments, the deformation pipe 501 can be fixedly connected with the connecting sleeve 502 in other feasible manners, such as adhesion.

As shown in fig. 1, in the initial state, the outside diameter of the deformation tube 501 is larger than the outside diameters of the first conduit 503 and the second conduit 504, and the diameter of the deformation tube 501 is larger than the diameters of the first conduit 503 and the second conduit 504, so that a certain amount of liquid medicine can be retained in the deformation tube 501 in the sealed structure, and the liquid medicine can be ensured to flow in the conduit 2 at all times. The cross sections of the first guide pipe 503 and the second guide pipe 504 are always the same, so that the connecting sleeves 502 on the two sides of the deformation pipe 501 can be consistent, the processing is convenient, and the production cost is reduced. The deformation tube 501 becomes larger in diameter due to expansion in the use state, as shown in fig. 2 and 3.

As shown in fig. 2 to 5, the flow stopping clip 8 has an elastic arm 801 and a fixed arm 802 which can be engaged with each other, the joint between the upper end and the lower end of the elastic arm 801 and the fixed arm 802 has a through hole 810 for the long conduit 5 to pass through, the inner side of the fixed arm 802 is provided with an elastic block 803, the inner side of the elastic arm 801 has a protrusion 804, and when the elastic arm 801 and the fixed arm 802 are engaged with each other, the protrusion 804 restricts the long conduit 5 between the elastic block 803 and the elastic block 801. In the preferred embodiment, the elastic block 803 is made of TPU material, and has a certain elasticity to contract, so that after the flow stopping clip 8 tightens the long catheter 5, the long catheter 5 and the elastic block 803 are in flexible contact, which will not cause the flow interruption of the internal medical fluid by the flow stopping clip 8, and the elastic block 803 can make the medical fluid inside the long catheter 5 continuously and slowly flow at an extremely low flow rate, so as to prevent the blood in the catheter 2 from flowing back and standing to form thrombus. The elastic block 803 in the preferred embodiment is rectangular, and in other possible embodiments, the elastic block 803 may be square, circular, oval, or any other suitable shape.

In order to fix the elastic block 803, two limit blocks 805 are disposed on the inner side of the fixed arm 802, and the elastic block 803 is clamped between the two limit blocks 805. Further, the extending end of the limiting block 805 has an arc notch 806 matched with the outer contour of the long conduit 5 to fix the position of the long conduit 5, so as to ensure that the long conduit 5 can contact with the elastic block 803, and prevent the long conduit 5 from deviating to the outside of the flow stopping clip 8.

In this preferred embodiment, the tail end of the elastic arm 801 has an outer protruding block 807, the tail end of the fixed arm 802 tilts outward, and an inner block 808 capable of being engaged with the outer block 807 is disposed on the inner wall of the bending portion between the tail end of the fixed arm 802 and the body of the fixed arm 802. The elastic arm 801 and the fixing arm 802 are buckled together by clamping between the outer clamping block 807 and the inner clamping block 808.

As shown in fig. 5, in the preferred embodiment, there are two inner blocks 808, so that the outer block 807 can be arbitrarily buckled on one of the inner blocks 808. This enables the flow stopping clip 8 to clamp the first conduit 503 to stop the flow of the liquid medicine in the conduit 2, thereby facilitating the injection operation; but also can generate positive pressure to ensure the continuous flow of the liquid medicine in the conduit 2. In other possible embodiments, multiple stages of the inner fixture blocks 808 may be disposed on the fixing arm 802, so that the flow stopping clip 8 has multiple shift positions to adapt to the first conduits 503 with different diameters, and further control the flow rate of the liquid medicine inside the first conduits 503.

In addition, a set of ribs 809 are arranged on the outer sides of the fixed arm 802 and the elastic arm 801. The ribs 809 can enhance the friction force of the outer side walls of the fixed arm 802 and the elastic arm 801, so as to facilitate the operation and use of an operator in practice.

In order to improve the use safety of the utility model, a needle-prick prevention protection component is arranged between the catheter holder 1 and the needle tube holder 3, the needle-prick prevention component comprises a protection holder 9 with a hollow structure, a movable blocking piece 10 is arranged in the hollow part of the protection holder 9, a jack for the needle tube to pass through is arranged on the movable blocking piece 10, and after the needle tube 4 is separated from the jack of the movable blocking piece 10, the axis of the needle tube 4 is not coincident with the axis of the jack, so that the needle tube 4 cannot pass out again after being separated from the movable blocking piece 10, and the needle tube 4 can not extend out of a medical worker for prick mistake after the use is finished, thereby improving the use safety of the medical worker.

Specifically, as shown in fig. 4, a step 901 is provided at the front end of the hollow interior of the protection seat 9, the height of the left end of the step 901 is greater than that of the right end thereof, and the movable blocking piece 10 is disposed at the left end of the step 901 and is less than that of the step 901. The presence of the step 901 defines the position of the movable flap 10, ensuring that the needle cannula 4 is retracted and disengaged from the movable flap 10. In other possible embodiments, the needle-stick prevention protection assembly may also adopt other structures that can close the needle tube 4, such as a movable block with an outer diameter smaller than the inner diameter of the protection seat 9 to block the extension of the needle tube 4.

Further, as shown in fig. 4, the needle tube 4 has a recess 401, the inner wall of the hollow interior of the protective seat 9 has a protrusion 902 adapted to the recess 401, and the protrusion 902 is engaged with the recess 401. With the structure, after the convex point 902 is clamped with the concave part 401, the needle tube 4 cannot be pulled out of the protective seat 9, so that the needle tube 4 can be further ensured to be sealed in the protective seat 9 after being used, and the use safety of the utility model is further improved.

In order to ensure the tightness in the needle tube seat 3, the inner cavity of the needle tube seat 3 is provided with an isolating plug 11, and the isolating plug 11 is positioned at the tail end of the needle tube seat 3. The isolating plug 11 is made of elastic material, so that after the needle tube 4 is withdrawn, the through hole caused by the needle tube 4 is closed by the elasticity of the isolating plug to seal the bottom of the needle tube seat 3, and the leakage of the liquid medicine is prevented.

In the preferred embodiment of the present invention, only the infusion connector 6 of a straight type is shown, and in other possible embodiments, the infusion connector 6 may also be Y-shaped and may have 2 ports.

The working principle of the utility model is as follows:

firstly, after the disinfection is finished, the needle tube 4 and the catheter 2 are simultaneously inserted into the blood vessel of a patient;

secondly, pulling the needle tube seat 3 backwards to separate the needle tube seat from the catheter seat 1, and simultaneously pulling the needle tube 4 out, wherein the catheter 2 is remained in the blood vessel of the patient, and the front end of the needle tube 4 is sealed in the anti-acupuncture protection component;

then, the catheter 2 is completely sent into the vein, the catheter holder 1 is fixed on the skin of a patient by using an adhesive tape, and then the dropping speed of the liquid medicine is adjusted for transfusion;

and finally, after the transfusion is finished, performing tube sealing treatment: firstly, flushing the long catheter 5 by using normal saline, and flushing residual liquid medicine in the long catheter 5 into a blood vessel; and then the flow stopping clamp 8 is clamped, and tube sealing liquid is injected to expand the deformation tube 501, and due to the existence of the elastic block 803 and the inner clamping block 808 on the flow stopping clamp 8, the tube sealing liquid can slowly flow into the blood vessel, so that the liquid is always input into the blood vessel through the catheter 2, and the mobility in the blood vessel is ensured.

It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.

The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.

Claims (9)

1. Last malleation vein indwelling needle, catheter subassembly and needle tubing subassembly including interconnect, the catheter subassembly includes catheter seat (1) and fixes at its distal end, is used for pipe (2) of infusion, the needle tubing subassembly includes needle tube seat (3) and needle tubing (4) at least, the near-end of needle tubing (4) is inserted and is located in needle tube seat (3) and reciprocal anchorage, the distal end of needle tubing (4) passes the cavity inside and the stretching out of pipe (2), its characterized in that: one side of pipe seat (1) is passed through malleation subassembly intercommunication infusion and is connected (6), malleation subassembly is for the deformation pipe (501) of being made by elastic medical material, the both ends of deformation pipe (501) are fixed with first pipe (503) and second pipe (504) through adapter sleeve (502) respectively, be provided with on first pipe (503) with its flexible contact stop press from both sides (8) and its other end with pipe seat (1) is fixed and the intercommunication, the other end of second pipe (504) with infusion connects (6) and fixes and communicates.

2. The continuous positive pressure venous indwelling needle of claim 1, wherein: the deformation pipe (501) is made of TPU materials and is fixed with the connecting sleeve (502) through ultrasonic welding.

3. The continuous positive pressure venous indwelling needle of claim 1, wherein: in the initial state, the outer diameter of the deformation pipe (501) is larger than the outer diameters of the first guide pipe (503) and the second guide pipe (504), and the cross sections of the first guide pipe (503) and the second guide pipe (504) are always the same.

4. The continuous positive pressure venous indwelling needle of any one of claims 1 to 3, wherein: the flow stopping clip (8) is provided with an elastic arm (801) and a fixed arm (802) which can be clamped with each other, a through hole (810) for enabling a long guide pipe (5) to pass through is formed in the joint of the upper end and the lower end of the elastic arm (801) and the fixed arm (802), an elastic block (803) is arranged on the inner side of the fixed arm (802), a convex block (804) is arranged on the inner side of the elastic arm (801), and when the elastic arm (801) and the fixed arm (802) are clamped with each other, the convex block (804) limits the long guide pipe (5) between the elastic block (803) and the elastic arm (801).

5. The continuous positive pressure venous indwelling needle of claim 4, wherein: two limiting blocks (805) are arranged on the inner side of the fixed arm (802), the elastic block (803) is clamped between the two limiting blocks (805), and the extending end of each limiting block (805) is provided with an arc notch (806) matched with the outer contour of the long guide pipe (5) so as to fix the position of the long guide pipe (5).

6. The continuous positive pressure venous indwelling needle of claim 5, wherein: the shape of the elastic block (803) is rectangular, circular or triangular.

7. The continuous positive pressure venous indwelling needle of claim 6, wherein: the tail end of the elastic arm (801) is provided with an outer convex clamping block (807), the tail end of the fixed arm (802) tilts outwards, and an inner clamping block (808) which can be clamped with the outer clamping block (807) is arranged on the inner wall of a bending part between the tail end of the fixed arm and the body of the fixed arm (802); and a group of convex ribs (809) are arranged on the outer sides of the fixed arm (802) and the elastic arm (801).

8. The continuous positive pressure venous indwelling needle of claim 7, wherein: two inner clamping blocks (808) are provided.

9. The continuous positive pressure venous indwelling needle of claim 1, wherein: an isolating plug (11) is arranged in the inner cavity of the needle tube seat (3), and the isolating plug (11) is located at the tail end of the needle tube seat (3).

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