CN209916912U

CN209916912U - Blood return prevention venous indwelling needle

Info

Publication number: CN209916912U
Application number: CN201820733412.XU
Authority: CN
Inventors: 曾凡洪
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-05-16
Filing date: 2018-05-16
Publication date: 2020-01-10
Anticipated expiration: 2028-05-16

Abstract

The utility model discloses a prevent blood return vein and keep somewhere needle, press from both sides, sealing member and keep somewhere pipe, setting component including needle file, drainage tube, stagnant flow, be provided with the cavity in the needle file, still include base, guide sheath and shutoff strip, the base sets up the tail end of needle file and with needle file threaded connection, sealing member sets up and closes on the needle file tail end in the cavity and with cavity inner wall sealing connection, the needle file head end with keep somewhere pipe tail end fixed connection just the cavity with keep somewhere pipe fluid turn-on connection, the drainage tube sets up on the lateral wall of needle file and with cavity fluid turn-on connection. The utility model discloses can prevent that blood from flowing back to keeping somewhere intraductally, effectively solve the thrombus that blood backward flow caused and blockked up and keep somewhere the pipe or the thrombus is washed into the intravascular problem that causes medical hidden danger of patient.

Description

Blood return prevention venous indwelling needle

Technical Field

The utility model relates to the field of transfusion, in particular to a blood return prevention venous indwelling needle.

Background

The common vein indwelling needle consists of a puncture needle, a polyurethane indwelling tube sleeved on the puncture needle and a soft plastic infusion needle, wherein the indwelling tube is brought into a vein by the puncture needle when the intravenous infusion is used for the first time, the puncture needle is drawn out after blood return, liquid medicine is injected into the blood vessel through the indwelling tube, the front part of the indwelling tube is left in the blood vessel after one-time infusion is completed, the indwelling tube is reused when the next infusion is carried out, and the indwelling tube can be left in a human body for nearly one hundred hours. Based on the medical advantages and technical factors of the venous indwelling needle, the venous indwelling needle has been widely applied in more developed countries abroad. In recent years, domestic applications are increasing. The disposable venous indwelling needle is used in venous transfusion, so that the venous puncture times are reduced, and the venous puncture time interval is prolonged. And the operation is simple and convenient, the success rate is high, the side effect is small, the pain of a patient is relieved, and the timely and safe medication is ensured. The workload of medical staff is reduced, and the medical staff is effectively helped to avoid blood pollution except injection. However, the existing venous indwelling needle often causes the influence on the next transfusion because blood flows back into the indwelling tube to form thrombus to block the transfusion passage, and small thrombus is flushed into the vein and attached to the inner wall of the vein vessel at other parts of the human body to narrow the vessel and even block the vessel, thereby causing serious influence on the health of a patient.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a can prevent that blood from flowing back to the drainage tube or keeping somewhere intraductal blood return vein and keep somewhere the needle, effectively solved the thrombus that the blood backward flow caused and blockked up the problem that keeps somewhere the pipe or the thrombus is washed into the intravascular hidden danger that causes of patient.

In order to solve the technical problem, the utility model discloses a technical scheme as follows: the anti-blood return venous indwelling needle comprises a needle seat, a drainage tube, a flow stopping clamp, a sealing component, an indwelling tube and a shaping component, wherein a cavity is arranged in the needle seat, the anti-blood return venous indwelling needle further comprises a base, a guiding sheath and a plugging strip, the base is arranged at the tail end of the needle seat and is in threaded connection with the needle seat, the sealing component is arranged in the cavity close to the tail end of the needle seat and is in sealed connection with the inner wall of the cavity, the head end of the needle seat is fixedly connected with the tail end of the indwelling tube and is in fluid conduction connection with the indwelling tube, the drainage tube is arranged on the side wall of the needle seat and is in fluid conduction connection with the cavity, and the shaping component is arranged at the joint of the tail end of the indwelling; the head end of the guide sheath sequentially penetrates through the base and the sealing component and is arranged in the cavity close to the liquid inlet end of the shaping component, a gap of 0.7-1.5mm is formed between the head end of the guide sheath and the inner wall of the liquid inlet end of the shaping component, and the tail end of the guide sheath is arranged outside the needle base; the blocking strip axially moves along the guide sheath under the action of thrust and penetrates through a shaping component to be arranged in the indwelling tube, the head end of the blocking strip is at least flush with the liquid outlet end of the indwelling tube, the outer wall of the head end of the blocking strip is in sealing fit with the inner wall of the indwelling tube, and the guide sheath is in sealing fit with the sealing component; the plugging strip moves axially along the guide sheath under the action of traction force to exit the indwelling tube.

Above-mentioned prevent blood return vein and keep somewhere needle, the shutoff strip sets up in the guide sheath just the shutoff strip outer wall with guide sheath inner wall sealing fit.

The anti-blood return venous indwelling needle is characterized in that the guide sheath is fixedly connected with the base.

According to the anti-blood return venous indwelling needle, the side wall of the tail end of the blocking strip is provided with the push-pull component, the push-pull component comprises the connecting strip, the internal thread sleeve and the external thread arc-shaped plate, the side wall of the guide sheath is provided with the guide groove which penetrates through the inner wall and the outer wall of the guide sheath along the axial direction of the guide sheath, and the notch of the guide groove is arranged at the tail end of the guide sheath; the outer thread arc plate is arranged in the inner thread sleeve and is in threaded connection with the inner thread sleeve, the outer thread arc plate is arranged outside the guide sheath and is fixedly connected with one end of the connecting strip through one end, the other end of the connecting strip penetrates through the guide groove and is fixedly connected with the plugging strip, and the tail end of the plugging strip is arranged in the guide sheath; the blocking strip moves along the guide sheath axially under the push-pull of the push-pull component.

The blood return prevention venous indwelling needle comprises a shaping component and a needle seat, wherein the shaping component comprises a guide pipe and a diversion funnel, the guide pipe is arranged in the tail end of the indwelling tube and is in fluid conduction connection with the indwelling tube, the tail end of the guide pipe is in fluid conduction connection with the throat end of the diversion funnel, and the diversion funnel is arranged outside the indwelling tube and in the needle seat; the head end of the guide sheath is close to the diversion funnel and is coaxially matched with the diversion pipe and the diversion funnel.

According to the anti-blood return venous indwelling needle, a gap of 0.7-1.5mm is formed between the head end of the guide sheath and the inner wall of the flow guide funnel.

Above-mentioned prevent blood return vein and keep somewhere needle, sealing member is rubber buffer or medical material software stopper, be equipped with the opening orientation on rubber buffer or the medical material software stopper base and with the coaxial taper hole of base, the guide sheath head end passes the taper hole sets up in the cavity.

The blood return prevention venous indwelling needle is characterized in that a clamping ring is arranged on the inner wall of the cavity close to the base; a clamping groove is formed in the outer wall of the rubber plug; the rubber buffer sets up when in the cavity, the snap ring with the draw-in groove joint.

The taper angle of the tapered through hole is 2-5 degrees.

Above-mentioned prevent blood return vein and keep somewhere needle, the shutoff strip is polyurethane strip or medical software strip, be provided with hydrophobic coating on the shutoff strip lateral wall.

The utility model has the advantages as follows: the utility model discloses can avoid blood reflux to keeping somewhere intraductal formation thrombus blockage infusion passageway after the infusion completely, more avoid keeping somewhere the thrombus that intraductal formation to wash into the patient intravenous and stay the hidden danger for patient health, still avoided the patient to infuse to use heparin normal saline liquid seal when finishing simultaneously.

Drawings

The present invention will be further explained with reference to the drawings and examples.

FIG. 1 is a schematic view of the detachable structure of the venous indwelling needle of the present invention;

FIG. 2 is a schematic axial view of the guide sheath and the plugging strip of FIG. 1;

fig. 3 is a schematic structural view of the sealing member of the venous indwelling needle of the present invention.

In the figure, 1-indwelling tube; 2-a needle seat; 3-a cavity; 4-a sealing member; 5, a drainage tube; 6-stop clamp; 7-plugging strips; 8-a base; 9-an internal threaded sleeve; 9-1-an external thread arc plate; 10-a guide sheath; 11-a snap ring; 12-a card slot; 13-a connecting strip; 14-shaping the component.

Detailed Description

In order to explain the present invention more clearly, the present invention will be further described with reference to the preferred embodiments and the accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.

As shown in fig. 1-3, the anti-backflow venous indwelling needle of the present invention comprises a needle base 2, a drainage tube 5, a flow stopping clip 6, a sealing member 4, an indwelling tube 1 and a shaping member 14, wherein a cavity 3 is provided in the needle base 2, and is characterized by further comprising a base 8, a guiding sheath 10 and a sealing strip 7, wherein the base 8 is provided at the tail end of the needle base 2 and is in threaded connection with the needle base 2, the sealing member 4 is provided in the cavity 3 near the tail end of the needle base 2 and is in sealed connection with the inner wall of the cavity 3, the head end of the needle base 2 is fixedly connected with the tail end of the indwelling tube 1, the cavity 3 is in fluid communication connection with the indwelling tube 1, and the drainage tube 5 is provided on the side wall of the needle base 2 and is in fluid communication connection with the cavity 3; the shaping component 14 is arranged at the joint of the tail end of the indwelling tube 1 and the head end of the needle seat 2; the head end of the guide sheath 10 sequentially penetrates through the base 8 and the sealing component 4 to be arranged in the cavity 3 close to the liquid inlet end of the shaping component 14, a gap of 0.7-1.5mm is formed between the head end of the guide sheath and the inner wall of the liquid inlet end of the shaping component 14, and the tail end of the guide sheath 10 is arranged outside the needle seat 2; the blocking strip 7 axially moves along the guide sheath 10 under the action of thrust and penetrates through a shaping member 14 to be arranged in the indwelling tube 1, the head end of the blocking strip 7 is at least flush with the liquid outlet end of the indwelling tube 1, the outer wall of the head end of the blocking strip 7 is in sealing fit with the inner wall of the indwelling tube 1, and the guide sheath 10 is in sealing fit with the sealing member 4; the blocking strip 7 moves axially along the guide sheath 10 under the action of traction force to withdraw from the indwelling catheter 1. Wherein the blocking strip 7 is arranged in the guide sheath 10, and the outer wall of the blocking strip 7 is in sealing fit with the inner wall of the guide sheath 10; the guide sheath 10 is fixedly connected with the base 8; the shaping component 14 comprises a flow guide pipe and a flow guide funnel, the flow guide pipe is arranged in the tail end of the indwelling tube 1 and is in fluid conduction connection with the indwelling tube 1, the tail end of the flow guide pipe is in fluid conduction connection with the throat end of the flow guide funnel, and the flow guide funnel is arranged outside the indwelling tube 1 and in the needle seat 2; the head end of the guide sheath 10 is close to the diversion funnel and is coaxially matched with the diversion pipe and the diversion funnel, and a gap of 0.7-1.5mm is arranged between the head end of the guide sheath 10 and the inner wall of the diversion funnel. In this embodiment, the blocking strip 7 and the indwelling tube 1 are made of the same material or made of a medical soft material, and a hydrophobic coating is disposed on the side wall of the blocking strip 7.

In order to avoid the foreign body sensation brought to people when the head end of the blocking strip 7 is placed into the indwelling tube 1 and to enable the blocking strip 7 to move into and out of the indwelling tube 1 along the axial direction of the guide sheath 10 easily under the action of thrust or traction force and avoid the influence of the shaking of the guide sheath 10 on the sealing performance of the needle seat 2 structure, in the embodiment, a push-pull component is arranged on the side wall of the tail end of the blocking strip 7, the push-pull component comprises a connecting strip 13, an internal thread sleeve 9 and an external thread arc-shaped plate 9-1, a guide groove penetrating through the inner wall and the outer wall of the guide sheath 10 is arranged on the side wall of the guide sheath 10 along the axial direction of the guide sheath 10, and a notch of the guide groove is arranged at the tail end of the guide sheath 10; the external thread arc-shaped plate 9-1 is arranged in the internal thread sleeve 9 and is in threaded connection with the internal thread sleeve, the external thread arc-shaped plate 9-1 is arranged outside the guide sheath 10 and is fixedly connected with one end of the connecting strip 13, the other end of the connecting strip 13 penetrates through the guide groove and is fixedly connected with the plugging strip 7, and the tail end of the plugging strip 7 is arranged in the guide sheath 10; the plugging strip 7 moves axially along the guide sheath 10 under the push-pull of the push-pull member. The working principle is as follows: the internal thread sleeve 9 is rotated, the internal thread sleeve 9 drives the external thread arc-shaped plate 9-1 to advance or retreat through the thread between the internal thread sleeve 9 and the external thread arc-shaped plate 9-1, so that the plugging strip 7 is driven to axially move along the guide sheath 10 through the external thread arc-shaped plate 9-1 and the connecting plate 13, and the plugging strip 7 can pass in and out of the indwelling tube 1. The guide sheath 10 can reduce the radial swing of the blocking strip 7 when the blocking strip moves axially along the guide sheath 10 to enter and exit the indwelling tube 1 under the action of thrust or traction force, and effectively reduces the influence of the radial swing of the blocking strip 7 on the internal sealing performance of the needle seat 2.

In order to improve the sealing between the guiding sheath 10 and the sealing member 4, especially the sealing between the guiding sheath 10 and the sealing member 4 during the axial movement of the plugging strip 7 along the guiding sheath 10 into and out of the indwelling tube 1 under the action of pushing or pulling force, in this embodiment, the sealing component 4 is a rubber plug or a medical material soft plug, the rubber plug or the medical material soft plug is provided with a conical through hole with an opening facing the base 8 and coaxial with the base 8, the taper angle of the taper hole is 2-5 degrees, which not only can ensure that the head end of the guide sheath 10 can smoothly enter the cavity 3 through the rubber plug, but also can ensure the sealing performance between the guide sheath 10 and the rubber plug in the moving process of the plugging strip 7, and avoids the liquid leakage phenomenon of the needle base 2 in the utility model; the head end of the plugging strip 7 penetrates through the diversion funnel and the diversion pipe and is arranged in the indwelling pipe 1. In the long-term use process, when the guide sheath 10 passes through the tapered through hole in the rubber stopper, the friction force between the guide sheath 10 and the tapered through hole can make the guide sheath 10 drive the rubber stopper to move, and in order to avoid the movement of the rubber stopper, in this embodiment, a snap ring 11 is arranged on the inner wall of the cavity 3 close to the base 8; a clamping groove 12 is formed in the outer wall of the rubber plug; when the rubber buffer sets up in the cavity 3, snap ring 11 with draw-in groove 12 joint.

Use the utility model discloses the time, will keep somewhere pipe 1 and put into after the vein, carry out the liquid seal with normal saline earlier, and use only the flow stopping presss from both sides 6 and cliies drainage tube 5, then it is rotatory female thread sleeve pipe 9, thereby pass through the external screw thread arc 9-1 promotes blocking strip 7 to keep somewhere pipe 1's play liquid end remove until 7 head end ends of blocking strip with keep somewhere 1 liquid outlet of pipe flushes or 7 head end ends of blocking strip set up keep somewhere the 1 liquid outlet outside of pipe. When using the utility model discloses during the infusion, will earlier drainage tube 5 and external infusion pipeline's play liquid end fluid turn-on connection, then rotatory internal thread pipe 9 to through external screw thread arc 9-1 pulls blocking strip 7 to remove in the guide sheath 10, blocking strip 7 withdraws from completely keep somewhere pipe 1 and setting component 14 until 7 head end ends of blocking strip with the head end parallel and level of guide sheath 10, then open only clamp 6 can infuse.

The utility model discloses in, guide sheath 10 head end with clearance between the water conservancy diversion funnel inner wall can make medicine liquid pass through smoothly and pass through keep somewhere 1 entering vein of pipe, moreover setting component 14 not only can keep keeping somewhere 1 inlet of pipe in the state of opening, avoid keep somewhere 1 inner wall of pipe and take place the adhesion and can't normally infuse, can also ensure simultaneously blocking strip 7 can pass in and out smoothly keep somewhere 1 of pipe, avoid 7 head ends of blocking strip are difficult for getting into when crooked keep somewhere and carry out the shutoff to keeping somewhere the pipe in the pipe 1.

The above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and for those skilled in the art, other variations or changes in different forms can be made on the basis of the above descriptions, and all embodiments cannot be exhausted here, and all the obvious variations or changes introduced by the technical solution of the present invention are still in the scope of protection of the present invention.

Claims

1. The anti-blood return vein indwelling needle comprises a needle seat (2), a drainage tube (5), a flow stopping clamp (6), a sealing component (4), an indwelling tube (1) and a shaping component (14), wherein a cavity (3) is arranged in the needle seat (2), it is characterized by also comprising a base (8), a guide sheath (10) and a plugging strip (7), the base (8) is arranged at the tail end of the needle seat (2) and is in threaded connection with the needle seat (2), the sealing component (4) is arranged in the cavity (3) close to the tail end of the needle seat (2) and is connected with the inner wall of the cavity (3) in a sealing way, the head end of the needle seat (2) is fixedly connected with the tail end of the indwelling tube (1) and the cavity (3) is communicated and connected with the fluid of the indwelling tube (1), the drainage tube (5) is arranged on the side wall of the needle seat (2) and is communicated and connected with the cavity (3) in a fluid way; the shaping component (14) is arranged at the joint of the tail end of the indwelling tube (1) and the head end of the needle seat (2); the head end of the guide sheath (10) sequentially penetrates through the base (8) and the sealing component (4) and is arranged in the cavity (3) close to the liquid inlet end of the shaping component (14), a gap of 0.7-1.5mm is formed between the head end of the guide sheath and the inner wall of the liquid inlet end of the shaping component (14), and the tail end of the guide sheath (10) is arranged outside the needle seat (2); the blocking strip (7) axially moves along the guide sheath (10) under the action of thrust, penetrates through the shaping component (14) and is arranged in the indwelling tube (1), the head end of the blocking strip (7) is at least flush with the liquid outlet end of the indwelling tube (1), the outer wall of the head end of the blocking strip (7) is in sealing fit with the inner wall of the indwelling tube (1), and the guide sheath (10) is in sealing fit with the sealing component (4); the blocking strip (7) moves axially along the guide sheath (10) under the action of traction force to withdraw from the indwelling tube (1).

2. The anti-flashback venous indwelling needle of claim 1, wherein the blocking strip (7) is disposed within the introducer sheath (10) and the outer wall of the blocking strip (7) is in sealing engagement with the inner wall of the introducer sheath (10).

3. The anti-flashback venous indwelling needle of claim 2, wherein the guide sheath (10) is fixedly connected with the base (8).

4. The anti-blood return venous indwelling needle according to claim 3, wherein a push-pull member is arranged on the side wall of the tail end of the blocking strip (7), the push-pull member comprises a connecting strip (13), an internally threaded sleeve (9) and an externally threaded arc plate (9-1), a guide groove penetrating through the inner wall and the outer wall of the guide sheath (10) is arranged on the side wall of the guide sheath (10) along the axial direction of the guide sheath (10), and a notch of the guide groove is arranged on the tail end of the guide sheath (10); the external thread arc-shaped plate (9-1) is arranged in the internal thread sleeve (9) and is in threaded connection with the internal thread sleeve, the external thread arc-shaped plate (9-1) is arranged outside the guide sheath (10) and is fixedly connected with one end of the connecting strip (13), the other end of the connecting strip (13) penetrates through the guide groove and is fixedly connected with the plugging strip (7), and the tail end of the plugging strip (7) is arranged in the guide sheath (10); the blocking strip (7) moves along the axial direction of the guide sheath (10) under the push-pull of the push-pull component.

5. The anti-backflow venous indwelling needle according to claim 4, wherein the shaping member (14) comprises a flow guide tube and a flow guide funnel, the flow guide tube is arranged in the tail end of the indwelling tube (1) and is in fluid communication with the indwelling tube (1), the tail end of the flow guide tube is in fluid communication with the throat end of the flow guide funnel, and the flow guide funnel is arranged outside the indwelling tube (1) and in the needle seat (2); the head end of the guide sheath (10) is close to the diversion funnel and is coaxially matched with the diversion pipe and the diversion funnel.

6. The anti-backflow venous indwelling needle according to claim 5, wherein a gap of 0.7-1.5mm is provided between the head end of the guide sheath (10) and the inner wall of the guide funnel.

7. The anti-blood return venous indwelling needle according to any one of claims 1 to 6, wherein the sealing member (4) is a rubber plug or a soft plug made of medical material, the rubber plug or the soft plug made of medical material is provided with a tapered through hole which is opened towards the base (8) and is coaxial with the base (8), and the head end of the guide sheath (10) passes through the tapered through hole and is arranged in the cavity (3).

8. The anti-backflow venous indwelling needle according to claim 7, wherein a snap ring (11) is provided on the inner wall of the cavity (3) adjacent to the base (8); a clamping groove (12) is formed in the outer wall of the rubber plug; the rubber buffer sets up when in cavity (3), snap ring (11) with draw-in groove (12) joint.

9. The anti-flashback venous indwelling needle of claim 8, wherein the conical bore has a cone angle of 2 ° -5 °.

10. The anti-blood return venous indwelling needle of any one of claims 1 to 6, wherein the blocking strip (7) is a polyurethane strip or a medical soft strip, and a hydrophobic coating is arranged on the side wall of the blocking strip (7).