CN212679769U

CN212679769U - Remaining needle

Info

Publication number: CN212679769U
Application number: CN202020399075.2U
Authority: CN
Inventors: 王宁; 李墨奇; 何文昌; 刘杨; 叶文婷; 陈英; 严慧
Original assignee: Second Affiliated Hospital Army Medical University
Current assignee: Second Affiliated Hospital Army Medical University
Priority date: 2020-03-25
Filing date: 2020-03-25
Publication date: 2021-03-12
Anticipated expiration: 2030-03-25

Abstract

The utility model provides an indwelling needle, which belongs to the field of medical appliances, and comprises a needle core, a transfusion tube and a hose with one end inserted into a blood vessel, wherein the hose is communicated with the transfusion tube, the needle core can move in the tube hole of the hose, one end of the hose is embedded into a second jack, the other end extends out of the main body part, the part of the second jack between the sealing plug and the hose is a blood containing cavity, and the blood containing cavity is communicated with the transfusion tube; the needle core sequentially penetrates through the first jack, the guide block and the sealing plug from top to bottom and then enters the hose, wherein the needle core, the first jack and the sealing plug are both in dynamic sealing in a matching way, and are fixedly connected with the guide block; the parts of the needle core except the needle point are provided with gaps with the inner wall of the tube hole of the hose, so that when the needle point is retracted into the tube hole of the hose, blood in the blood vessel flows into the blood containing cavity through the gaps. The indwelling needle is simple and reliable to use.

Description

Remaining needle

Technical Field

The utility model relates to the technical field of medical equipment, especially, relate to and keep somewhere the needle.

Background

An indwelling needle is a commonly used medical device for intermittent, continuous or daily intravenous infusion therapy or single dose administration, blood sample collection or blood, blood product infusion. The existing indwelling needle needs to pull out the needle core after being inserted into a blood vessel, is extremely inconvenient to operate, and may injure the blood vessel of a patient if the needle core is pulled out and withdrawn slightly.

SUMMERY OF THE UTILITY MODEL

To the deficiency that exists among the prior art, the utility model provides a keep somewhere needle, it has solved the inconvenient problem of moving back the needle that exists among the prior art.

According to the utility model discloses an embodiment, a keep somewhere needle, insert vascular hose including nook closing member, transfer line and one end, hose and transfer line intercommunication, the nook closing member can the hose tube hole removes, the needle point of nook closing member exposes the vascular one end of hose insertion and blocks up this end, still includes rigid main part and the guide block, the spring that resets, the sealing plug that are located the main part, wherein

The main body part sequentially comprises a first jack and a second jack which are coaxially communicated with each other from top to bottom, and the aperture of the second jack is larger than that of the first jack;

the guide block, the reset spring and the sealing plug are sequentially arranged in the second jack from top to bottom, the guide block can slide up and down in an upper hole section in the second jack, the guide block is limited at an initial position in the second jack under the action of the clamping mechanism, the guide block moves upwards under the action of the reset spring when the clamping mechanism relieves the limiting force, the sealing plug is fixed in the second jack and divides the second jack into an upper hole section and a lower hole section, and two ends of the reset spring are respectively connected to the guide block and the sealing plug which are opposite to the reset spring;

one end of the hose is embedded into the second jack, the other end of the hose extends out of the main body part, the part of the second jack, which is positioned between the sealing plug and the hose, is a blood containing cavity, and the blood containing cavity is communicated with the infusion tube;

the needle core sequentially penetrates through the first jack, the guide block and the sealing plug from top to bottom and then enters the hose, wherein the needle core, the first jack and the sealing plug are both in dynamic sealing in a matching manner, and the needle core is fixedly connected with the guide block; the parts of the needle core except the needle point are provided with gaps with the inner wall of the tube hole of the hose, so that when the needle point is retracted into the tube hole of the hose, blood in the blood vessel flows into the blood containing cavity through the gaps.

The technical principle of the utility model is that: when the blood sampling device is used, the hose enters a blood vessel together due to the puncture effect of the needle core needle point, then the clamping force is released by the clamping mechanism, the reset spring pushes the guide block upwards, so that the needle core connected with the guide block exits a certain distance towards the outside of the main body part, the end of the hose inserted into the blood vessel is opened at the moment, blood flows into the blood containing cavity from the gap between the needle core and the hose, and flows into the infusion tube from the blood containing cavity, and blood sampling is finished.

Compared with the prior art, the utility model discloses following beneficial effect has: this keep somewhere needle does not need to hold between the fingers the tip of nook closing member and draws the plunger outwards when using, directly utilizes chucking device to withdraw the needle through the release to the confining force of guide block, and whole process all relies on the elastic restoring force of reset spring to progressively extrapolate the nook closing member, and not only easy operation, safe and reliable moreover.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Fig. 2 is a schematic view of the matching structure between the guide block and the clamping mechanism.

In the above drawings: the device comprises a main body part 1, a hose 2, a needle core 3, an infusion tube 4, a sealing plug 5, a return spring 6, a guide block 7, a pull ring 8, a pull rope 9, a pushing spring 10, a sliding tongue 11, a needle crown 12, a guide sliding groove 101 and a bulge part 701.

Detailed Description

The technical solution of the present invention will be further explained with reference to the accompanying drawings and embodiments.

As shown in fig. 1, the present embodiment provides an indwelling needle comprising a stylet 3, an infusion tube 4, a tube 2 having one end inserted into a blood vessel, the tube 2 being in communication with the infusion tube 4, the stylet 3 being movable in the tube hole of the tube 2, the stylet 3 having a needle point exposed from the one end of the tube 2 inserted into the blood vessel and blocking the end, a rigid main body 1, and a guide block 7, a return spring 6, and a sealing plug 5 located in the main body 1. Wherein: the main body part 1 is internally provided with a first jack and a second jack which are coaxially communicated with each other from top to bottom in sequence, and the aperture of the second jack is larger than that of the first jack. The above-mentioned guide block 7, reset spring 6, sealing plug 5 of this embodiment from top to bottom set gradually in the second jack, just guide block 7 can slide from top to bottom in the downthehole upper portion hole section of second jack, and guide block 7 is restricted initial position department in the second jack under the chucking mechanism effect, when chucking mechanism removes the confining force guide block 7 moves up under the effect of reset spring 6, and above-mentioned chucking device can design as required adaptability, and all can be so that the guide block 7 pushed by reset spring 6 can be used by the mechanism of fixing. Meanwhile, the sealing plug 5 of the present embodiment is fixed in the second receptacle and divides the second receptacle into two upper and lower hole sections, and two ends of the return spring 6 are respectively connected to the guide block 7 and the sealing plug 5 opposite to the two ends. For the hose 2, one end of the hose 2 is embedded into the second jack, the other end of the hose extends out of the main body part 1, the part of the second jack, which is positioned between the sealing plug 5 and the hose 2, is a blood containing cavity, and the blood containing cavity is communicated with the infusion tube 4 so as to be communicated with external equipment. Most importantly, the stylet 3 sequentially penetrates through the first insertion hole, the guide block 7 and the sealing plug 5 from top to bottom and then enters the hose 2, wherein the stylet 3, the first insertion hole and the sealing plug 5 are both in dynamic sealing in a matching mode, and are fixedly connected with the guide block 7. The parts of the needle core 3 except the needle point have gaps with the inner wall of the tube hole of the hose 2, so that when the needle point retracts into the tube hole of the hose 2, blood in a blood vessel flows into the blood containing cavity through the gaps. When the indwelling needle is used, the hose 2 enters the blood vessel together due to the puncture action of the needle point of the needle core 3, similar to the existing indwelling needle. However, when withdrawing the needle, the remaining needle has a distinct structure to realize, namely: the clamping force is released by the clamping mechanism, so that the reset spring 6 pushes the guide block 7 upwards, the needle core 3 connected with the guide block 7 is withdrawn out of the main body part 1 for a certain distance, the end of the hose 2 inserted into the blood vessel is opened at the moment, blood flows into the blood containing cavity from the gap between the needle core 3 and the hose 2 and flows into the infusion tube 4 from the blood containing cavity, and blood sampling is finished.

For the above-mentioned clamping mechanism, there are many structures that can be adopted, but after all, the needle has a smaller size requirement, so the following two structural designs are recommended for the requirements of simplified structure and easy operation: first, the clamping mechanism is a plug pin which can be pulled out from the main body part 1, and the plug pin passes through the wall of the second jack hole and then is inserted into the guide block 7 so as to fix the guide block 7 at the initial position. The structure is extremely simple and reliable, but is not beneficial to the requirement of repeatedly taking blood or correcting the blood taking part of the same patient, after the blood taking part is pulled out, the guide block 7 can not be reinserted by the pulling pin due to twisting, and another big defect is that the pulling pin is not easy to manage and is easy to lose after being pulled out. For this purpose, a second design is proposed: referring to fig. 2, in order to prevent the guide block 7 from twisting in the second insertion hole, a protruding portion 701 is provided on the guide block 7, the protruding portion 701 extends into the guide sliding groove 101 in the hole wall of the second insertion hole, and the guide sliding groove 101 controls the guide block 7 to slide in the up-down direction. Correspondingly, the clamping mechanism comprises a sliding tongue 11, a pushing spring 10 and a pull rope 9 with a pull ring 8, the pushing spring 10 and the sliding tongue 11 are located in the wall of the second jack, the pushing spring 10 pushes the sliding tongue 11 to the position inserted into the protruding portion 701 under the natural state so as to clamp the guide block 7, the pull rope 9 penetrates through the wall of the second jack and then is connected with the sliding tongue 11, the sliding tongue 11 is pulled out of the protruding portion 701 when the pull ring 8 is pulled on the outer side of the main body portion 1, when the needle core 3 is pushed back to reset again, only the pull rope 9 needs to be loosened, and the clamping mechanism is extremely convenient and reliable and cannot completely separate parts. In addition, in order to control the retraction process of the stylet 3, the length H of the sealing section between the stylet 3 and the hose 2 should be equal to the distance between the upper end surface of the guide block 7 and the inner top surface of the second jack. It is also possible to design a needle crown 12 so that the needle tip is exposed to a predetermined initial position just at the port of the hose 2 when the needle crown 12 is brought into contact with the end face of the main body portion 1.

Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.

Claims

1. The utility model provides a keep somewhere needle, includes nook closing member, transfer line and one end and inserts vascular hose, hose and transfer line intercommunication, the nook closing member can the hose tube hole removes, the needle point of nook closing member exposes the one end that the hose inserted blood vessel and blocks up this end, its characterized in that: also comprises a rigid main body part, a guide block, a return spring and a sealing plug which are positioned in the main body part, wherein

2. The indwelling needle of claim 1, wherein: the clamping mechanism is a plug pin which can be pulled out from the main body part, and the plug pin penetrates through the wall of the second jack hole and then is inserted into the guide block so as to fix the guide block at the initial position.

3. The indwelling needle of claim 1, wherein: the guide block is provided with a protruding part which extends into a guide sliding groove in the hole wall of the second jack, and the guide sliding groove controls the guide block to slide along the up-down direction; the clamping mechanism comprises a sliding tongue, a pushing spring and a pull rope with a pull ring, the pushing spring and the sliding tongue are located in the wall of the second jack hole, the pushing spring pushes the sliding tongue to the position inserted into the protruding portion in a natural state so as to clamp the guide block, and the pull rope penetrates through the wall of the second jack hole and then is connected with the sliding tongue so as to pull the sliding tongue out of the protruding portion when the pull ring is pulled on the outer side of the main body portion.