CN219231005U

CN219231005U - Disposable spring compression type continuous positive pressure retention needle

Info

Publication number: CN219231005U
Application number: CN202222460754.8U
Authority: CN
Inventors: 李卫国; 张传雷
Original assignee: Suzhou Linhwa Medical Devices Co ltd
Current assignee: Suzhou Linhwa Medical Devices Co ltd
Priority date: 2022-09-14
Filing date: 2022-09-14
Publication date: 2023-06-23
Anticipated expiration: 2032-09-14

Abstract

The utility model discloses a linear spring compression type continuous positive pressure indwelling needle which comprises a catheter assembly and a needle tube assembly which are connected with each other, wherein one side of a catheter seat is communicated with an infusion assembly through a long catheter, the infusion assembly is a three-way piece, a first inlet of the infusion assembly is connected with an infusion connector, a second inlet of the infusion assembly is connected with a continuous positive pressure source with mechanical pressure, the continuous positive pressure source comprises a shell with an accommodating space, physiological saline is filled in the shell, a first end of the shell is communicated with a second inlet of the three-way piece, and a piston body and a spring for generating the mechanical pressure are arranged at the second end of the shell. The utility model is connected with a continuous positive pressure source through the long catheter, so that the inside of the catheter continuously generates positive pressure, and physiological saline in the positive pressure source always keeps a micro-flow pipeline penetration state, thereby avoiding thrombus formed at the top or inside of the positive pressure indwelling needle catheter and causing medical accidents.

Description

Disposable spring compression type continuous positive pressure retention needle

Technical Field

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

Background

The intravenous needle can reduce pain and fear of injection caused by repeated intravenous puncture, lighten the fidgetiness of family members, facilitate clinical medication, rescue medication for emergency and critical patients, lighten the workload of nurses and reduce pain of patients, so that the intravenous needle is widely applied in clinic.

Chinese patent CN202822325U discloses a venous indwelling needle comprising a catheter assembly, a needle tube assembly and an infusion connector assembly, the catheter assembly comprising a three-way catheter hub and a catheter connected to the front end of the first opening of the three-way catheter hub. The needle tube component comprises a needle seat sleeved outside the third opening of the three-way catheter seat and a needle tube connected to the needle seat, and the needle tube is inserted into the catheter and the three-way catheter seat. The second opening of the three-way catheter seat is connected with an infusion liquid joint component which comprises a long catheter, a flow stopping clamp, an infusion joint, an end cap and the like. Specific: the second opening of the three-way catheter seat 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 joint; one side of the infusion connector is provided with an infusion connector, and the other side is connected with an end cap; the infusion device can be inserted into the infusion connector for the infusion of the physiological saline.

In the using process of the venous indwelling needle, the flow stopping clamp is required to be in an open state, and transfusion is carried out through the infusion device matched with the transfusion joint or the end cap; after the transfusion is finished, one side of the infusion connector is sealed through the end cap, and the other side of the infusion connector is used for pushing physiological saline in the infusion connector through an infusion device connected to the infusion connector so as to wash the inner cavity of the venous indwelling needle; after the flushing is finished, an 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 cut-off state.

The venous indwelling needle in the prior art can be pulled out after infusion is finished, and because the human vein has certain blood pressure, the blood can be in a negative pressure state in the catheter, and the blood can flow back to the catheter, and the blood can be irradiated into platelet sediment for a long time so as to promote thrombosis, or the thrombus can enter a patient along with liquid medicine during the next infusion, so that unnecessary medical accidents such as blood vessel blockage, cerebral infarction and the like are caused.

In view of this, the applicant has proposed two different forms of continuous positive pressure indwelling needle in chinese patent application CN112023181A, CN114748728A, which can effectively solve the problem of thrombus formation. But are all elastic medical materials, such as TPU, which are different in deformation situations where the saline is filled with a relatively high pressure and in deformation situations where the saline is filled with a small portion of the saline is filled with a relatively low pressure, i.e. the pressure in the catheter is also different in both conditions, and the positive pressure also causes the saline to continuously decrease in the elastomer, so that the pressure becomes more uncontrollable.

Disclosure of Invention

The utility model aims to overcome the defects in the prior art and provide an effective and accurate controlled disposable spring compression type continuous positive pressure indwelling needle.

The aim of the utility model is achieved by the following technical scheme:

the utility model provides a disposable spring compression type continuous positive pressure keep somewhere needle, includes interconnect's pipe subassembly and needle tubing subassembly, the pipe subassembly includes the pipe seat and fixes at its distal end, the pipe for infusing, the needle tubing subassembly includes at least needle tube seat and needle tubing, the proximal end of needle tubing inserts and locates in the needle tubing seat and mutual fixation, the distal end of needle tubing passes the cavity inside of pipe stretches out, one side of pipe seat has the infusion subassembly through long pipe intercommunication, the infusion subassembly is a tee bend spare, is connected with infusion joint on its first entry, is connected with the continuous positive pressure source that has mechanical pressure on the second entry, continuous positive pressure source includes a shell that has accommodation space, is full of normal saline in it, the first end of shell with tee bend spare's second entry intercommunication is provided with piston body and produces mechanical pressure's spring at the second end.

Preferably, the first end of the housing is a luer fitting having a slow permeation pathway.

Preferably, the second end of the shell is provided with a spiral cover, and the two ends of the spring are respectively abutted against the spiral cover and the piston body and generate pressure on the spiral cover and the piston body.

Preferably, a sealing ring is arranged on the side wall of the piston body, and the normal saline is positioned in the cavity between the piston body and the first end.

Preferably, the original length of the spring is equal to the length of the inner cavity of the housing.

Preferably, the long guide pipe is provided with a flow stopping clamp which is in flexible contact with the long guide pipe.

Preferably, the flow stopping clip is provided with an elastic arm and a fixing arm which can be mutually clamped to clamp the long guide pipe, an elastic block is arranged on the inner side of the fixing arm, a bump is arranged on the inner side of the elastic arm, and when the elastic arm and the fixing arm are mutually clamped, the bump limits the long guide pipe between the elastic block and the long guide pipe.

Preferably, two limiting blocks are arranged on the inner side of the fixed arm, and the elastic block is clamped between the two limiting blocks.

Preferably, a needle-penetration-preventing protection component is arranged between the catheter seat and the needle tube seat.

The utility model provides a disposable spring compression type continuous positive pressure keep somewhere needle, includes interconnect's pipe subassembly and needle tubing subassembly, the pipe subassembly includes the pipe seat and fixes at its distal end, be used for the pipe of infusion, the needle tubing subassembly includes at least needle tube seat and needle tubing, the proximal end of needle tubing inserts and locates in the needle tube seat and mutual fixation, the distal end of needle tubing passes the cavity inside of pipe stretches out, one side of pipe seat has the infusion subassembly through long pipe intercommunication, the infusion subassembly is for the infusion joint and the alternative option piece of continuous positive pressure source, continuous positive pressure source includes a shell that has accommodation space, is full of normal saline in it, the first end of shell with the second entry intercommunication of tee bend spare is provided with piston body and the spring that produces mechanical pressure in the second end.

Preferably, the infusion connector and the continuous positive pressure source are the same luer connector that is connected to the long catheter.

The beneficial effects of the utility model are mainly as follows:

1. the long catheter is connected with a continuous positive pressure source, so that positive pressure is continuously generated in the catheter, physiological saline in the positive pressure source always keeps a micro-flow pipeline penetration state, and thrombus is prevented from forming at the top or in the catheter of the positive pressure indwelling needle, so that medical accidents are avoided;

2. the continuous positive pressure source adopts a spring with mechanical pressure, the elastic force of the spring is controlled, the positive pressure can be effectively regulated, the excessive pressure or the excessive pressure can be prevented, and the effectiveness of the product is ensured;

3. an anti-needling protection assembly is arranged between the catheter seat and the needle tube seat so as to ensure that the needle tube is sealed after the use is finished, prevent the needle tube from extending out and injure medical staff accidentally, and improve the use safety of the utility model.

Drawings

The technical scheme of the utility model is further described below with reference to the accompanying drawings:

fig. 1: a schematic perspective view of a preferred embodiment of the present utility model;

fig. 2: an exploded view of the catheter assembly and needle cannula assembly of the preferred embodiment of the present utility model;

fig. 3: a cross-sectional view of a preferred embodiment of the present utility model;

fig. 4: a schematic view of a flow stop clip according to a second embodiment of the present utility model.

Detailed Description

The present utility model will be described in detail below with reference to specific embodiments shown in the drawings. The embodiments are not limited to the present utility model, and structural, methodological, or functional modifications of the utility model from those skilled in the art are included within the scope of the utility model.

In the description of the embodiments, it should be noted that the positional or positional relationship indicated by the terms such as "center", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", etc. are based on the positional or positional relationship shown in the drawings, are merely for convenience of description and simplification of description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in the specific orientation, and thus are not to be construed as limiting the present utility model. 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 scheme, the direction approaching the operator is the near end, and the direction separating from the operator is the far end, with reference to the operator.

Example 1

The utility model discloses a disposable spring compression type continuous positive pressure indwelling needle. The preferred embodiment shown in fig. 1 and 2 comprises a catheter assembly and a needle tube assembly which are connected with each other, wherein the catheter assembly comprises a catheter seat 1 and a catheter 2 fixed at the distal end of the catheter assembly for transfusion, the needle tube assembly at least comprises a needle tube seat 3 and a needle tube 4, the proximal end of the needle tube 4 is inserted into the needle tube seat 3 and fixed with each other, the distal end of the needle tube 4 penetrates through the hollow interior of the catheter 2 and extends out, and one side of the catheter seat 1 is communicated with the transfusion assembly through a long catheter 5. The long guide pipe 5 is provided with a flow stopping clamp 8. An anti-needling protection component 9 is arranged between the catheter seat 1 and the needle tube seat 3.

Referring to fig. 3, the infusion assembly is a three-way member, and the first inlet of the three-way member is connected with an infusion connector 6 for daily normal infusion.

The second inlet of the tee is connected with a continuous positive pressure source 7 with mechanical pressure, specifically, the continuous positive pressure source 7 comprises a housing 701 with a containing space, a first end of the housing is communicated with the second inlet of the tee, and a piston body 703 and a spring 704 for generating mechanical pressure are arranged at the second end of the housing. The second end of the housing has a screw cap 705, and two ends of the spring 704 respectively abut against the screw cap 705 and the piston body 703 and generate pressure on the two. The cavity between the piston body 703 and the first end 707 is filled with saline 702.

The first end 707 of the housing is a luer fitting having a slow-permeation pathway with a lumen having less than 0.1mm of slow-permeation material including, but not limited to, flow restriction tubing, microporous filter plugs, and the like. The purpose is to achieve slow exudation of the saline 702.

When the continuous positive pressure source 7 is screwed with the tee, the cavity of the continuous positive pressure source is communicated with the long guide pipe 5, the pressure of the spring drives the piston body 703 to move, and the piston body 703 generates pressure on the normal saline 702, so that positive pressure is driven to generate, and micro-flow pipeline permeation is formed.

The utility model is characterized in that the positive pressure can be effectively regulated, and the original length of the spring 704 can be equal to the length of the inner cavity of the shell 701 in the aspect of spring force selection, so that the excessive or the insufficient pressure can be prevented. Further, the screw cap 705 also has an adjusting function, and by moving the screw axis of the screw cap 705, the spring 704 can be compressed or released, thereby having a fine tuning function.

For better sealing effect, the side wall of the piston body 703 is provided with a sealing ring 706, which can be one, two or more.

Example two

In order to better realize the positive pressure effect, the long guide pipe 5 is provided with a flow stopping clamp 8 which is flexibly contacted with the long guide pipe. As shown in fig. 4, the flow stop clip 8 has an elastic arm 801 and a fixing arm 802 that can be engaged with each other, a connection between the upper and lower ends of the elastic arm 801 and the fixing arm 802 has a through hole for the long catheter 5 to pass through, an elastic block 803 is disposed on the inner side of the fixing arm 802, a bump 804 is disposed on the inner side of the elastic arm 801, and when the elastic arm 801 and the fixing arm 802 are engaged with each other, the bump 804 limits the long catheter 5 between the long catheter and the elastic block 803. The elastic block 803 in the preferred embodiment is made of TPU, and has a certain elasticity to shrink, so that after the flow stop clip 8 tightens the long catheter 5, the long catheter 5 is in flexible contact with the elastic block 803, and the flow stop clip 8 does not cause the flow stop of the internal liquid medicine, and the elastic block 803 can enable the liquid medicine in the long catheter 5 to continuously and slowly flow at an extremely low flow rate, so as to avoid thrombus formation after the blood in the catheter 2 is refluxed and is stationary. The elastic block 803 in the preferred embodiment is rectangular, and in other possible embodiments, the elastic block 803 may be any suitable shape such as square, circular, oval, etc.

In order to fix the elastic block 803, two limiting blocks 805 are disposed on the inner side of the fixing arm 802, and the elastic block 803 is clamped between the two limiting blocks 805.

In the preferred embodiment, the tail end of the elastic arm 801 has an outer protruding clamping block 807, the tail end of the fixing arm 802 is tilted outwards, and an inner clamping block 808 that can be clamped with the outer clamping block 807 is disposed on the inner wall of the bending portion between the tail end and the body of the fixing arm 802. The elastic arm 801 and the fixing arm 802 are buckled together through the clamping connection between the outer clamping block 807 and the inner clamping block 808.

In addition, a set of ribs 809 are provided on the outside of the fixed arm 802 and the elastic arm 801. The ribs 809 can enhance the friction between the outer walls of the fixing arm 802 and the elastic arm 801, so as to facilitate the operation and use of the operator in practice.

Example III

The utility model provides a disposable spring compression type continuous positive pressure keep somewhere needle, includes interconnect's pipe subassembly and needle tubing subassembly, the pipe subassembly includes catheter holder 1 and fixes its distal end, is used for the pipe 2 of infusion, the needle tubing subassembly includes needle tube holder 3 and needle tubing 4 at least, the proximal end of needle tubing 4 inserts and locates in the needle tube holder 3 and mutual fixation, the distal end of needle tubing 4 passes the cavity inside of pipe is stretched out, one side of catheter holder 1 has the infusion subassembly through long pipe 5 intercommunication.

In contrast to the first embodiment, the infusion connector 6 and the continuous positive pressure source 7 may alternatively be in communication with the elongate catheter 5 as an infusion set. The continuous positive pressure source 7 may be the same as the first embodiment, and a housing 701 having a receiving space is filled with physiological saline 702, and a first end of the housing is connected to the second inlet of the tee, and a piston body 703 and a spring 704 for generating mechanical pressure are disposed at a second end of the housing, which may be other forms. Of course, the tee member in this embodiment may be a two-way member. Importantly, the infusion connector 6 and continuous positive pressure source 7 employ the same luer connector that is connected to the long catheter. Thus, when normal transfusion is needed, the transfusion joint 6 is communicated with the long catheter 5; when the infusion is finished, thrombus is prevented from being generated, the infusion connector 6 is detached from the long catheter 5, and then the continuous positive pressure source 7 is communicated with the long catheter 5 to generate positive pressure, so that micro-flow pipeline penetration is formed.

It should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is for clarity only, and that the skilled artisan should recognize that the embodiments may be combined as appropriate to form other embodiments that will be understood by those skilled in the art.

The above list of detailed descriptions is only specific to practical embodiments of the present utility model, and they are not intended to limit the scope of the present utility model, and all equivalent embodiments or modifications that do not depart from the spirit of the present utility model should be included in the scope of the present utility model.

Claims

1. The utility model provides a disposable spring compression type continuous positive pressure keep somewhere needle, includes interconnect's pipe subassembly and needle tubing subassembly, the pipe subassembly includes pipe seat (1) and fixes at its distal end, is used for pipe (2) of infusion, the needle tubing subassembly includes at least needle tube seat (3) and needle tubing (4), the proximal end of needle tubing (4) is inserted and is located in needle tube seat (3) and mutually fixed, the distal end of needle tubing (4) passes the inside and stretching out of cavity of pipe (2), one side of pipe seat (1) is through long pipe (5) intercommunication has infusion subassembly, its characterized in that: the infusion assembly is a three-way piece, a first inlet of the infusion assembly is connected with an infusion connector (6), a second inlet of the infusion assembly is connected with a continuous positive pressure source (7) with mechanical pressure, the continuous positive pressure source (7) comprises a housing (701) with an accommodating space, physiological saline (702) is filled in the housing, a first end of the housing is communicated with a second inlet of the three-way piece, and a piston body (703) and a spring (704) for generating the mechanical pressure are arranged at a second end of the housing.

2. The disposable spring-compressed continuous positive pressure retention needle of claim 1, wherein: the first end (707) of the housing is a luer fitting having a slow permeation pathway.

3. The disposable spring-compressed continuous positive pressure retention needle of claim 1, wherein: the second end of the shell is provided with a spiral cover (705), and two ends of the spring (704) are respectively abutted against the spiral cover (705) and the piston body (703) and generate pressure on the spiral cover and the piston body.

4. The disposable spring-compressed continuous positive pressure retention needle of claim 3, wherein: a sealing ring (706) is arranged on the side wall of the piston body (703), and the physiological saline (702) is positioned in the cavity between the piston body (703) and the first end (707).

5. The disposable spring-compressed continuous positive pressure retention needle of claim 1, wherein: the original length of the spring (704) is equal to the inner cavity length of the shell (701).

6. The disposable spring-compressed continuous positive pressure retention needle of any one of claims 1-5, wherein: the long guide pipe (5) is provided with a flow stopping clamp (8) which is flexibly contacted with the long guide pipe.

7. The disposable spring-compressed continuous positive pressure retention needle of claim 6, wherein: the flow stopping clamp (8) is provided with an elastic arm (801) and a fixed arm (802) which can be mutually clamped to clamp the long guide pipe (5), an elastic block (803) is arranged on the inner side of the fixed arm (802), a lug (804) is arranged on the inner side of the elastic arm (801), and when the elastic arm (801) and the fixed arm (802) are mutually clamped, the lug (804) limits the long guide pipe (5) between the lug and the elastic block (803); two limiting blocks (805) are arranged on the inner sides of the fixed arms (802), and the elastic blocks (803) are clamped between the two limiting blocks (805).

8. The disposable spring-compressed continuous positive pressure retention needle of any one of claims 1-5, wherein: an anti-needling protection component (9) is arranged between the catheter seat (1) and the needle tube seat (3).

9. The utility model provides a disposable spring compression type continuous positive pressure keep somewhere needle, includes interconnect's pipe subassembly and needle tubing subassembly, the pipe subassembly includes pipe seat (1) and fixes at its distal end, is used for pipe (2) of infusion, the needle tubing subassembly includes at least needle tube seat (3) and needle tubing (4), the proximal end of needle tubing (4) is inserted and is located in needle tube seat (3) and mutually fixed, the distal end of needle tubing (4) passes the inside and stretching out of cavity of pipe, one side of pipe seat (1) is through long pipe (5) intercommunication has infusion subassembly, its characterized in that: the infusion assembly is an alternative part of an infusion connector (6) and a continuous positive pressure source (7), the continuous positive pressure source (7) comprises a housing (701) with a containing space, physiological saline (702) is filled in the housing, a first end of the housing is communicated with a second inlet of the three-way part, and a piston body (703) and a spring (704) for generating mechanical pressure are arranged at the second end of the housing.

10. The disposable spring-compressed continuous positive pressure retention needle of claim 9, wherein: the infusion connector (6) and the continuous positive pressure source (7) adopt the same luer connector connected with the long catheter (5).