CN112023181A

CN112023181A - Disposable continuous positive pressure remaining needle

Info

Publication number: CN112023181A
Application number: CN202010909563.8A
Authority: CN
Inventors: 张传雷; 王国辉
Original assignee: Suzhou Linhwa Medical Devices Co ltd
Current assignee: Suzhou Linhwa Medical Devices Co ltd
Priority date: 2020-09-02
Filing date: 2020-09-02
Publication date: 2020-12-04

Abstract

The invention discloses a disposable continuous positive pressure 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, the near end of the needle tube is inserted into the needle tube seat and fixed with each other, the far end of the needle tube penetrates through the hollow interior of the catheter and extends out, one side of the catheter seat is communicated with a connecting component used for transfusion through a long catheter, the connecting component comprises a transfusion connector and a catheter cap, the head of the catheter cap is an elastic cap made of elastic medical materials, and a flow stopping clamp which is in flexible contact with the long catheter is arranged on the long catheter. The invention has the following beneficial effects: the long catheter is connected with an expansion part which can provide continuous positive pressure, so that liquid medicine in the catheter is always kept in a flowing state, and the top or the inside of the catheter is prevented from forming thrombus to cause medical accidents.

Description

Disposable continuous positive pressure remaining needle

Technical Field

The invention relates to the technical field of injection instruments, in particular to a disposable continuous positive pressure remaining 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, 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 an infusion joint, and the other side of the infusion joint is connected with an end cap; the infusion device can be inserted into the infusion joint for infusion of the physiological saline. When the venous indwelling needle is used, the flow stopping clamp needs to be in an open state, and infusion is carried out by matching the infusion device with an infusion joint 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 physiological saline in the transfusion joint through a transfusion device connected to the transfusion joint so as to wash the inner cavity of the vein retention 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.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide a disposable continuous positive pressure remaining needle.

The purpose of the invention is realized by the following technical scheme:

disposable malleation indwelling needle that lasts, 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, one side of pipe seat has the coupling assembling that is used for the infusion through long pipe intercommunication, coupling assembling includes infusion joint and pipe cap, the head of pipe cap is the elasticity cap of being made by elasticity medical material, be provided with the end clamp of flexonics with it on the long pipe.

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

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 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 pipe diameter of the long pipe gradually expands from the through hole to the connecting assembly.

Preferably, a needle-prick prevention protection assembly is arranged between the catheter seat and the needle tube seat, the needle-prick prevention assembly comprises a protection seat with a hollow structure, a movable blocking piece is arranged in the hollow of the protection seat, a jack for the needle tube to pass through is arranged on the movable blocking piece, and when the needle tube is separated from the jack of the movable blocking piece, the axis of the needle tube does not coincide with the axis of the jack.

Preferably, the front end of the hollow interior of the protection seat is provided with a step, the height of the left end of the step is greater than that of the right end of the step, and the movable blocking piece is arranged at the left end of the step and is less than that of the step.

Preferably, the needle tube is provided with a concave part, the inner wall of the hollow inner part of the protection seat is provided with a convex point matched with the concave part, and the convex point is clamped with the concave part.

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.

Disposable malleation indwelling needle that lasts, including interconnect's catheter subassembly and needle tubing subassembly, 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 tubing seat and needle tubing at least, the near-end of needle tubing is inserted and is located in the needle tubing seat and reciprocal anchorage, the distal end of needle tubing passes the cavity inside of pipe stretches out, one side of pipe seat has the coupling assembling that is used for the infusion through long pipe intercommunication, coupling assembling includes infusion joint and pressure source, be provided with the end clamp of flexible contact with it on the long pipe, the pressure source to quilt the end clamp produces the malleation all the time to press from both sides the long pipe after pressing from both sides tightly.

The invention has the following beneficial effects:

1. the long catheter is connected with an expansion part which can provide continuous positive pressure, so that liquid medicine in the catheter is always kept in a flowing state, and the top or the inside of the catheter is prevented from forming thrombus to cause medical accidents;

2. the elastic cap is made of TPU material, so that the elastic cap has certain elasticity and can expand to a certain degree, continuous positive pressure is generated in the catheter in a sealed state, and a certain amount of liquid medicine can be reserved in the elastic cap in a sealed structure, so that enough liquid medicine can flow in the catheter all the time;

3. 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;

4. the diameter of the long conduit is gradually enlarged towards the infusion joint, so that the internal capacity of the long conduit is increased, and the amount of the liquid medicine which can be stored is increased, thereby ensuring that enough liquid medicine always flows in the conduit;

5. 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 invention is improved.

Drawings

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

FIG. 1: an explosion diagram of an embodiment of the invention;

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

FIG. 3: an enlarged view of portion a in fig. 2;

FIG. 4: 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 4, the present invention discloses a disposable continuous positive pressure indwelling needle, which comprises a catheter assembly and a needle tube assembly which are 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 connecting assembly for transfusion through a long catheter 5, the connecting assembly comprises a transfusion connector 6 and a catheter cap 7, the head of the catheter cap 7 is an elastic cap 701 made of an elastic medical material, and the long catheter 5 is provided with a flow stopping clip 8 which is in flexible contact with the long catheter 5.

The elastic cap 701 in the preferred embodiment is made of TPU, so that the elastic cap has good elasticity, can expand to a certain degree, and generates continuous positive pressure inside the catheter 2 in a sealed state, and the sealed structure of the elastic cap 701 enables a certain amount of liquid medicine to be retained inside the elastic cap 701, thereby ensuring that the liquid medicine inside the catheter 2 always flows sufficiently. The elastic cap 701 is screwed with the catheter cap 7, so that the elastic cap 701 can be opened to input related medicine liquid.

In other possible embodiments, the catheter cap 7 with the elastic cap 701 can be replaced by other suitable pressure sources, such as an expandable elastic cavity, etc., which is communicated with the long catheter 5 to generate positive pressure to the inside of the long catheter all the time, so as to ensure the continuous flow of the medical liquid inside the long catheter to avoid thrombus. Further, in other possible embodiments, the long catheter 5 may also be externally connected with an elastic self-contraction mechanism or other mechanism capable of providing positive pressure through the infusion connector 6.

As shown in fig. 2 and 4 in detail, the flow stopping clip 8 has an elastic arm 801 and a fixed arm 802 that 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 limiting blocks 805 are disposed inside the fixed arm 802, and the elastic block 803 is clamped between the two limiting 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.

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.

As shown in fig. 1 and 2, the pipe diameter of the long pipe 5 gradually expands from the perforation 810 to the connection assembly. Such a structure can increase the internal volume of the long conduit 5, so that the long conduit 5 can store more liquid medicine to ensure that enough liquid medicine flows into the conduit 2 all the time inside the long conduit 5.

In the preferred embodiment, the flow stop clip 8 is positioned close to the catheter hub 1 to maximize the capacity of the long catheter tube 5.

In order to improve the use safety of the invention, 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. 3, 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. 3, 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 invention 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.

The operation principle of the remaining needle of the invention is briefly described as follows:

after the infusion of the indwelling needle is finished, the long catheter 5 and other structures of the indwelling needle are washed by using normal saline, and the residual liquid medicine in the long catheter 5 is washed into a blood vessel; then clamping the flow stopping clamp 8, and injecting tube sealing liquid to expand the elastic cap 701; due to the existence of the elastic block 803 on the flow stopping clip 8, the tube sealing liquid can continuously and slowly flow into the blood vessel, so that the liquid is always fed into the blood vessel by the catheter 2, and the fluidity 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

1. Disposable continuous positive pressure indwelling needle, including interconnect's catheter subassembly and needle tubing subassembly, the catheter subassembly includes pipe seat (1) and fixes pipe (2) at its distal end, be used for the 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 extension of pipe (2), its characterized in that: one side of the catheter seat (1) is communicated with a connecting assembly used for infusion through a long catheter (5), the connecting assembly comprises an infusion connector (6) and a catheter cap (7), the head of the catheter cap (7) is an elastic cap (701) made of elastic medical materials, and a flow stopping clamp (8) in flexible contact with the long catheter (5) is arranged on the long catheter.

2. The disposable continuous positive pressure indwelling needle according to claim 1, 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 the long conduit (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 conduit (5) between the elastic block (803) and the elastic arm (801).

3. The disposable continuous positive pressure indwelling needle according to claim 2, 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).

4. The disposable continuous positive pressure indwelling needle according to claim 3, 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).

5. The disposable continuous positive pressure indwelling needle according to claim 1, wherein: the pipe diameter of the long conduit (5) gradually expands from the perforation (810) to the connecting component.

6. The disposable continuous positive pressure indwelling needle according to any one of claims 1 to 5, wherein: the needle puncture preventing device is characterized in that a needle puncture preventing protection assembly is arranged between the catheter seat (1) and the needle tube seat (3), the needle puncture preventing assembly comprises a protection seat (9) with a hollow structure, a movable blocking piece (10) is arranged in the hollow of the protection seat (9), a jack for the needle tube to pass through is arranged on the movable blocking piece (10), and when 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.

7. The disposable continuous positive pressure indwelling needle according to claim 6, wherein: the front end of the hollow interior of the protective seat (9) is provided with a step (901), the height of the left end of the step (901) is greater than that of the right end of the step, and the movable blocking piece (10) is arranged at the left end of the step (901) and is less than that of the step (901).

8. The disposable continuous positive pressure indwelling needle according to claim 7, wherein: concave part (401) have on needle tubing (4), the inner wall of the hollow inside of protection seat (9) have with bump (902) of concave part (401) looks adaptation, bump (902) with concave part (401) joint.

9. The disposable continuous positive pressure indwelling needle according to claim 6, 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).

10. Disposable continuous positive pressure indwelling needle, including interconnect's catheter subassembly and needle tubing subassembly, the catheter subassembly includes pipe seat (1) and fixes pipe (2) at its distal end, be used for the 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 of pipe and stretch out its characterized in that: one side of the catheter seat (1) is communicated with a connecting assembly used for infusion through a long catheter (5), the connecting assembly comprises an infusion connector (6) and a pressure source, a flow stopping clamp (8) in flexible contact with the long catheter (5) is arranged on the long catheter (5), and the pressure source always generates positive pressure for the long catheter (5) clamped by the flow stopping clamp (8).