CN210056988U

CN210056988U - Remaining needle

Info

Publication number: CN210056988U
Application number: CN201821422528.8U
Authority: CN
Inventors: 余淘; 朱晓菊
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-08-31
Filing date: 2018-08-31
Publication date: 2020-02-14
Anticipated expiration: 2028-08-31

Abstract

An indwelling needle comprises an indwelling needle body, wherein the indwelling needle body comprises an injection needle, a catheter, a tee joint, an extension tube, a needle holding handle, an isolating plug, a backflow prevention device and a needle pulling device, the tee joint is internally divided into a main channel and a side channel, the side channel is communicated with the extension tube, the main channel is divided into a small channel, a conical step hole and a large channel, the small channel is communicated with the needle holding handle, the large channel is communicated with the catheter, the inner diameter of the small channel is smaller than that of the large channel, the small end of the conical step hole is communicated with the small channel, the large end of the conical step hole is communicated with the large channel, a water filtering plate is transversely arranged in the large channel close to the catheter end, the large channel is divided into an upper part and a lower part by the water filtering plate, a plurality of overflow holes are formed in the water filtering plate; the anti-reflux device is arranged in the main channel, the remaining needle can prevent blood from refluxing, and a single-hand clamp is not needed; the blood vessel can be prevented from being broken or penetrating through due to needle withdrawal; thereby avoiding the left hand from being fixed not firmly to cause the indwelling needle to slide out of the blood vessel.

Description

Remaining needle

Technical Field

The utility model relates to the field of medical equipment, concretely relates to keep somewhere needle.

Background

The venous indwelling needle is also called a trocar, is a medical instrument for venous transfusion treatment, and is commonly used for transfusion for patients with serious rescue, advanced cancer and high puncture difficulty. At present, the vein retention needle is increasingly widely used in clinic, and is especially used for old, weak and inconvenient patients, infants and patients who are difficult to cooperate with infusion therapy. However, the existing indwelling needle has the following defects: (1) even in the case of a closed one-handed clamp, a portion of the blood will flow back through the three-way tube into the extension tube; (2) when a user fixes the indwelling needle with the left hand and withdraws the needle with the right hand, the blood vessel is easy to rupture or penetrate the blood vessel; (3) if the left hand is not firmly fixed, the indwelling needle slides out of the blood vessel when the injection needle retracts.

SUMMERY OF THE UTILITY MODEL

Aiming at the problems, the indwelling needle not only effectively prevents blood backflow, but also can avoid the rupture or the penetration of blood vessels of a patient caused by the left-hand fixation of the indwelling needle and the withdrawal of the needle by the right hand of a user; thereby avoiding the left hand from causing the indwelling needle to slide out of the blood vessel when the left hand is fixed and the injection needle is not firmly withdrawn.

In order to achieve the above purpose, the present invention is realized by the following technical solution: comprises an indwelling needle body, the indwelling needle body comprises an injection needle, a catheter, a tee joint, an extension tube, a needle holding handle, an isolating plug, an anti-backflow device and a needle pulling device, the interior of the tee joint is divided into a main channel and a side channel, the side channel is communicated with the extension pipe, the main channel is divided into a small channel, a conical step hole and a large channel, the small channel is communicated with the needle holding handle, the large channel is communicated with the catheter, the inner diameter of the small channel is smaller than that of the large channel, the small end of the conical stepped hole is communicated with the small passage, the large end of the conical stepped hole is communicated with the large passage, a water filter plate is transversely arranged in the large channel close to the end of the guide pipe, the water filter plate divides the large channel into an upper part and a lower part, a plurality of overflow holes are formed in the water filtering plate, and the overflow holes are used for communicating the upper part and the lower part of the large channel;

the anti-backflow device comprises a blocking block and a magnetic part, the blocking block is positioned in the conical stepped hole, the blocking block is magnetic, the magnetic part is embedded in the wall body of the conical stepped hole, and after the injection needle is pulled out, the outer wall of the blocking block is circumferentially abutted against the side wall of the conical stepped hole under the action of magnetic force;

the needle holding handle is a cylindrical body, the isolating plug is also a cylindrical body, the circumferential dimension of the needle holding handle is larger than that of the isolating plug, the needle pulling device comprises a fixed shaft, a clamping jaw and an elastic part, the fixed shaft is fixed on the outer wall of the isolating plug, the clamping jaw is rotationally connected with the fixed shaft, a first groove, a second groove and a guide groove are arranged on the outer side wall of the needle holding handle, a partition plate is arranged between the first groove and the second groove, the vertical distance from the outer wall of the partition plate to the central shaft of the needle holding handle is smaller than the radius of the needle holding handle, the guide groove is arranged on the outer side wall of the needle holding handle, one end of the guide groove is communicated with the second groove, the other end of the guide groove extends along the central shaft of the needle holding handle and close to the direction of the isolating plug until the needle holding handle is communicated with the outside, and a claw is arranged at the, the claw is clamped in the groove, the elastic piece is arranged between the claw and the needle holding handle, one end of the elastic piece is fixed on the claw, the other end of the elastic piece abuts against the end face of the needle holding handle, and the elastic piece is in a pressed state.

Further, the magnetic force between the magnetic member and the plugging block is equal to the gravity of the plugging block.

Further, the restoring force of the elastic part is larger than the friction force applied to the injection needle during the process of being pulled out.

Furthermore, the jaw is far away from the groove end is provided with a handle, a stop block is arranged on the handle and is positioned between the handle and the isolation plug, and the vertical distance between the bottom surface of the stop block and the outer side wall of the isolation plug is larger than the height of the partition plate and smaller than the distance between the outer side wall of the needle holding handle and the upper end surface of the partition plate. .

Further, the distance between the first groove and the second groove is equal to one third of the length of the injection needle.

Further, the magnetic member is circumferentially disposed around the tapered stepped bore.

Furthermore, the outer wall of the magnetic part is covered with a layer of silica gel.

The indwelling needle at least comprises the following advantages:

the anti-backflow device is arranged in the tee joint, and after the injection needle is pulled out, the blocking block is positioned in the conical stepped hole and is circumferentially abutted against the side wall of the conical stepped hole under the action of magnetic force, so that a liquid flow channel in the tee joint is closed, and blood is prevented from flowing back into the extension pipe; when transfusion is required, the blocking block is flushed away under the impact force of liquid, and the liquid smoothly enters the conduit through the water filtering plate; the needle pulling device comprises a fixed shaft, a clamping jaw and an elastic piece, wherein the clamping jaw clamps a needle holding handle on the isolating plug, and after the clamping jaw is rotated and the clamping jaw falls off a groove on the needle holding handle, the needle holding handle drives the injection needle to eject one third of the length of the injection needle under the action of the restoring force of the elastic piece, so that the left hand can be prevented from fixing a remaining needle, and the blood vessel of a patient is prevented from being broken or penetrating through the blood vessel of the patient when the right hand withdraws the needle; and can also avoid the problem that the indwelling needle slides out of the blood vessel when the left hand is not fixed and the needle core is not firmly withdrawn.

Drawings

FIG. 1 is a schematic structural view of an indwelling needle according to the present embodiment;

FIG. 2 is a side view schematically showing the structure of the needle withdrawing device of the indwelling needle shown in FIG. 1;

FIG. 3 is a front view schematically showing the structure of the needle withdrawing device of the indwelling needle shown in FIG. 1;

FIG. 4 is a view showing the position of the stopper of the indwelling needle shown in FIG. 1 after the needle is removed;

FIG. 5 is a view showing the position of a stopper when the indwelling needle shown in FIG. 1 is used for infusion;

reference numerals: 10-indwelling needle, 100-injection needle, 200-catheter, 300-tee joint, 400-extension tube, 500-needle holding handle, 600-isolating plug, 700-backflow prevention device, 800-needle pulling device, 310-main channel, 320-side channel, 330-water filtering plate, 311-small channel, 312-tapered step hole, 313-large channel, 710-blocking block, 720-magnetic part, 810-fixed shaft, 820-claw, 821-handle, 822-claw, 823-stopper, 830-elastic part, 841-first groove, 842-second groove, 843-guide groove and 844-clapboard.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.

Referring to fig. 1 to 2, an indwelling needle 10 includes an indwelling needle body. The indwelling needle body comprises an injection needle 100, a catheter 200, a tee 300, an extension tube 400, a needle holding handle 500, an isolating plug 600, a backflow prevention device 700 and a needle drawing device 800. The injection needle 100 is connected with the needle holder 500, the catheter 200 covers the surface of the injection needle 100, the extension tube 400 is connected with the tee 300, the tee 300 is used for injecting liquid, the isolating plug 600 is used for guiding the injection needle 100, the backflow preventer 700 is used for preventing blood backflow, and the needle drawing device 800 is used for assisting in needle drawing.

Specifically, the tee 300 is divided into a main channel 310 and a side channel 320. The side passage 320 communicates with the extension pipe 400, and the main passage 310 is divided into a small passage 311, a tapered stepped hole 312, and a large passage 313. A tapered stepped bore 312 is located between the small passage 311 and the large passage 313. The internal diameter of the small channel 311 is smaller than the internal diameter of the channel. The small end of the tapered stepped bore 312 communicates with the small passage 311, and the large end of the tapered stepped bore 312 communicates with the large passage 313. A water filtering plate 330 is transversely arranged in the end of the large channel 313 close to the conduit 200, the large channel 313 is divided into an upper part and a lower part by the water filtering plate 330, a plurality of overflow holes are arranged on the water filtering plate 330, and the upper part and the lower part of the large channel 313 are communicated by the overflow holes.

Referring to fig. 1, 4 and 5, a backflow prevention device 700 prevents backflow of blood. The backflow prevention device 700 includes a blocking block 710 and a magnetic member 720. The plugging block 710 is located in the tapered stepped bore 312, and the plugging block 710 has magnetism. The magnetic member 720 is embedded in the outer wall of the tapered stepped bore 312. Before the needle 100 is not pulled out, the stopper 710 is positioned in the tapered stepped hole 312, and when the needle 100 is pulled out, the outer wall of the stopper 710 is circumferentially abutted against and sealed with the side wall of the tapered stepped hole 312 by the action of magnetic force. In this embodiment, the blocking block 710 is preferably a steel ball with magnetism, and the magnetic member 720 is a magnetic strip with magnetism. The magnetic members 720 are circumferentially disposed around the inner wall of the tapered stepped bore 312. The magnetic force between the steel ball and the magnetic member 720 is equal to the weight of the steel ball. Therefore, no matter the tee joint 300 is in a horizontal state or a vertical state, the outer wall of the steel ball and the circumferential direction of the side wall of the conical stepped hole 312 are always in an abutting sealing state under the condition of not receiving pressure from the small channel 311 end. When the transfusion is carried out, the liquid in the conveying bottle flushes the blocking block 710, the blocking block 710 falls on the water filtering plate 330, the liquid flows into the catheter 200 through the plurality of overflow holes on the water filtering plate 330 and finally flows into the blood vessel of a patient, and in order to prevent the steel ball from rusting and increase the sealing effect between the steel ball and the conical stepped hole 312, a layer of silica gel pad is covered outside the steel ball.

Referring to fig. 2 and 3, the needle holder 500 is a cylindrical body, the isolating plug 600 is also a cylindrical body, and the circumferential dimension of the needle holder 500 is greater than the circumferential dimension of the isolating plug 600. The needle withdrawing device 800 includes a fixing shaft 810, a jaw 820 and an elastic member 830. The needle pulling device 800 is used for assisting in needle pulling, so that blood vessels of a patient are prevented from being broken or penetrating the blood vessels when medical staff withdraw the needle from the right hand; thereby avoiding the left hand from causing the indwelling needle to slide out of the blood vessel when the left hand is fixed and the injection needle is not firmly withdrawn. The fixing shaft 810 is fixed on the outer wall of the isolating plug 600. Pawl 820 is rotatably coupled to fixed shaft 810. The end of the claw 820 is provided with a claw 822, and the outer side wall of the needle holder 500 provided with the needle holder is provided with a first groove 841, a second groove 842 and a guide groove 843. The distance between the first 841 and second 842 grooves is equal to one third of the length of the injection needle 100. A spacer 844 is disposed between the first recess 841 and the second recess 842. The outer wall of the diaphragm 844 is spaced a vertical distance from the central axis of the needle holder 500 that is less than the radius of the needle holder 500. The guide groove 843 is disposed on the outer side wall of the needle holder 500, and one end of the guide groove 843 is communicated with the second groove 842, and the other end thereof extends along the central axis of the needle holder 500 and in the direction close to the isolating plug 600 until communicating with the outside. The claws 822 of the claws 820 are caught in the first recesses 841. To hold and operate the jaw 820, the jaw 820 is provided with a handle 821 at an end remote from the jaw 822. A stop 823 is arranged on the handle 821, the stop 823 is located between the handle 821 and the isolating plug 600, and the vertical distance between the bottom surface of the stop 823 and the outer side wall of the isolating plug 600 is larger than the depth of the partition 844 and smaller than the distance between the outer side wall of the needle holding handle 500 and the upper end surface of the partition 844. The elastic member 830 is disposed between the latch 820 and the needle holder 500, one end of the elastic member 830 is fixed to the latch 820, the other end of the elastic member 830 abuts against the end surface of the needle holder 500, and the elastic member 830 is in a pressed state, and the restoring force of the elastic member 830 is greater than the friction force of the injection needle 100 in the process of being pulled out. In this embodiment, the elastic member 830 is preferably a spring, and it is understood that in other embodiments, the elastic member 830 may have other elastic members 830. When the injection needle is used, the handle 821 is pressed downwards, the claw 820 rotates around the fixed shaft 810 to drive the claw 822 to move away from the needle holding handle 500, and finally the claw 822 falls off the groove, and under the action of the restoring force of the elastic piece 830, the needle holding handle 500 drives the injection needle 100 to pop out away from the isolating plug 600. .

The method of the indwelling needle 10 described above is specifically:

between the times when the indwelling needle 10 is not in use, the injection needle 100 is inserted into the three-way 300 and the catheter 200, and the stopper 710 in the three-way 300 is pushed aside. The method comprises the following specific steps:

1. selecting blood vessels: selecting thick and straight parts, good elasticity and rich blood flow, and avoiding the venous valve and the joint;

2. disinfecting the skin;

3. and (3) tourniquet tying: pricking 10cm above the disinfection range, with proper tightness, which is not suitable for more than 2 minutes;

4. the needle protection cap is removed vertically upwards, and the injection needle 100 is loosened left and right;

5. puncturing: tightly pulling skin, directly pricking vein, and inserting needle at 15-30 deg.C with slow speed, and inserting needle 0.2cm after blood return;

6. withdrawing the injection needle 100: holding the isolating plug 600 with one hand and pressing the handle 821 on the claw 820 downwards with the other hand, wherein the claw 820 rotates around the fixed shaft 810; subsequently, the claw 822 falls off the first groove 841 on the needle holder 500, the needle holder 500 drives the needle 100 to eject in the direction away from the isolating plug 600 under the action of the restoring force of the spring, and when the needle 100 is retracted by one third of the length, the claw 822 is clamped into the second groove 842 and stops ejecting. At this time, the needle holder 500 is rotated to slide the claws 822 into the guide grooves 843, and then the catheter 200 is slowly fed into the vein. The isolating plug 600 is slowly withdrawn until the isolating plug completely falls off, and the blocking block 710 falls into the tapered stepped hole 312 again under the action of magnetic force and is circumferentially sealed and abutted against the side wall of the tapered stepped hole 312 to prevent blood from flowing backwards in the process that the injection needle 100 falls off the tee 300;

7. then the tourniquet is loosened, the liquid in the delivery bottle washes the blocking block 710 open, the blocking block 710 falls on the water filtering plate 330, and the liquid flows into the catheter 200 through a plurality of overflow holes on the water filtering plate 330 and finally flows into the blood vessel of the patient;

8. adjusting the dropping speed of the liquid according to the requirement;

9. sealing and nursing: the indwelling needle 10 is fixed with a sterile transparent patch with the puncture point as the center.

In the use process of the indwelling needle 10, the backflow prevention device 700 can prevent blood from flowing backwards, and the partition board can ensure that the infusion can be carried out smoothly; the needle pulling device 800 can automatically eject the needle holding handle 500 and the injection needle 100 out of one third of the length of the injection needle, thereby avoiding the blood vessel of the patient from being broken or penetrating the blood vessel when the left hand of the user fixes the remaining needle and the right hand withdraws the needle; thereby avoiding the left hand from causing the indwelling needle to slide out of the blood vessel when the left hand is fixed and the injection needle is not firmly withdrawn.

Finally, it should be noted that: while there have been shown and described fundamental principles and principal features of the invention and advantages of the invention, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. An indwelling needle is characterized by comprising an indwelling needle body, wherein the indwelling needle body comprises an injection needle, a catheter, a tee joint, an extension tube, a needle holding handle, an isolating plug, an anti-backflow device and a needle pulling device, the interior of the tee joint is divided into a main channel and a side channel, the side channel is communicated with the extension pipe, the main channel is divided into a small channel, a conical step hole and a large channel, the small channel is communicated with the needle holding handle, the large channel is communicated with the catheter, the inner diameter of the small channel is smaller than that of the large channel, the small end of the conical stepped hole is communicated with the small passage, the large end of the conical stepped hole is communicated with the large passage, a water filter plate is transversely arranged in the large channel close to the end of the guide pipe, the water filter plate divides the large channel into an upper part and a lower part, a plurality of overflow holes are formed in the water filtering plate, and the overflow holes are used for communicating the upper part and the lower part of the large channel;

2. The indwelling needle according to claim 1, wherein the magnetic force between the magnetic member and the blocking block is equal to the weight of the blocking block.

3. The indwelling needle according to claim 1, wherein the resilient member has a restoring force greater than the frictional force experienced during withdrawal of the needle.

4. The indwelling needle according to claim 1, wherein the pawl is provided with a handle away from the groove end, a stop is provided on the handle and located between the handle and the isolating plug, and the vertical distance between the bottom surface of the stop and the outer wall of the isolating plug is greater than the height of the partition and less than the distance between the outer wall of the needle holding handle and the upper end surface of the partition.

5. The indwelling needle according to claim 1, wherein the distance between the first groove and the second groove is equal to one third of the length of the injection needle.

6. The indwelling needle of claim 1, wherein the magnetic member is disposed circumferentially within the tapered stepped bore.

7. The indwelling needle according to claim 1, wherein the outer wall of the magnetic member is covered with a layer of silicone.