CN210990901U

CN210990901U - Auxiliary device for intravenous injection of rat tail

Info

Publication number: CN210990901U
Application number: CN201920865000.6U
Authority: CN
Inventors: 赵相轩; 孙洪赞; 卢再鸣; 石喻
Original assignee: Shengjing Hospital of China Medical University
Current assignee: Shengjing Hospital of China Medical University
Priority date: 2019-06-11
Filing date: 2019-06-11
Publication date: 2020-07-14
Anticipated expiration: 2029-06-11

Abstract

The utility model provides a rat tail intravenous route auxiliary device belongs to medical experiment auxiliary assembly technical field, concretely relates to rat tail vein needle insertion puncture injection auxiliary device. The utility model provides a convenient to use improves the rat tail injection auxiliary device of rat tail prick needle success rate. The utility model discloses a bottom plate is provided with fixed subassembly of mouse tail and the subassembly of pricking on the bottom plate, its characterized in that: the tail fixing assembly comprises a fixed rotating wheel arranged on the bottom plate, a movable rotating wheel is arranged on the bottom plate and positioned on the side of the fixed rotating wheel through a first sliding groove, and a return spring enabling the movable rotating wheel to lean against the fixed wheel is arranged on the movable rotating wheel; the needle inserting assembly comprises a rotating shaft arranged on the bottom plate, a sliding block which can transversely slide along the rotating shaft and can rotate along with the rotating shaft is arranged on the rotating shaft, a needle cylinder is arranged below the sliding block, and a needle head which slides along the needle cylinder is arranged in the needle cylinder; the needle cylinder corresponds to the fixed rotating wheel and the movable rotating wheel; the fixed rotating wheel is connected with the rotating shaft through a gear transmission assembly.

Description

Auxiliary device for intravenous injection of rat tail

Technical Field

The utility model belongs to the technical field of medical science experiment auxiliary assembly, concretely relates to rat tail vein entry puncture injection auxiliary device.

Background

In medical research, rats (e.g., SD rats, Wistar rats, etc.), mice (e.g., kunming mice), and humans belong to the same class of mammals, and have organ structures and genes similar to those of humans. The animal model has the advantages of small mass, mild and smooth temperament, fast growth, short breeding period, strong disease resistance and the like, and is selected as an animal model research object in a laboratory. By carrying out pharmacological and toxicological experiments, tumor experiments and other various acute and chronic reaction experiments simulating human bodies on rats or mice, the method obtains the attention achievements accepted by the medical field, greatly promotes the progress and development of the medical level of human beings and benefits the human beings. In practice, the current administration modes of the big and small mice as animal models include gavage administration, intraperitoneal injection, subcutaneous injection, tail vein injection and the like. The tail intravenous injection (also known as tail vein puncture) is the most important administration method, and compared with other administration modes, the method has the advantages that the pharmacological experiment result is accurate and reliable, the method is closest to the administration mode of a human body, and the dosage and the number of experimental animals can be saved. However, in practice, it is found that the tail vein is relatively deep buried due to the thinness of the tail vein, and particularly, the successful puncture of the rat is very difficult due to the thinness of the horny layer and veins of the tail, and particularly, the success rate of puncture and drug administration is very low for the rat with the tail vein in a square shape or a bamboo joint shape. Therefore, experimenters, especially beginners, need to spend a great deal of energy on practicing the 'rat tail vein puncture', but still have high failure rate, and waste of materials and time is caused, so that the problems are troubled for basic and clinical experimenters and prevent the progress of related medical tests from being delayed. Therefore, it is necessary to find a safe and reliable method for rat tail venipuncture with higher success rate. The utility model discloses a semi-automatic piercing depth of mouse tail vein who develops has successfully solved above-mentioned problem. Has the characteristics of economy, practicality, stable structure, easy operation, high needle inserting success rate, difficult displacement and falling, accurate drug delivery and the like. The technical device utilizes the characteristics of the rat tail different from other body parts: the skin is exposed, the surface has the characteristics of regular rugged ring line-shaped structure and the like, the position of the needle head is calculated by the step-by-step hinged gear, the angle is adjusted, the needle is inserted by means of ejection, and the observation window is provided for verifying the successful needle insertion and other structures so as to realize accurate positioning, mechanical puncture needle insertion and stable remaining of the needle head. The utility model discloses the device has successfully solved the inaccurate problem that causes the difficult or even failure of using medicine of mouse vein puncture, only needs simple study can the upper part of the arm, and the repeatability is high, provides the assurance for the experimental data and the good experimental result who gain the reliability in the animal experiment.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to above-mentioned problem, provide a convenient to use, improve the mouse tail injection auxiliary device of mouse tail prick needle success rate.

In order to achieve the purpose, the utility model discloses a following technical scheme, the utility model discloses a bottom plate is provided with the fixed subassembly of mouse tail and the subassembly of pricking on the bottom plate, its characterized in that: the tail fixing assembly comprises a fixed rotating wheel arranged on the bottom plate, a movable rotating wheel is arranged on the bottom plate and positioned on the side of the fixed rotating wheel through a first sliding groove, and a return spring enabling the movable rotating wheel to lean against the fixed wheel is arranged on the movable rotating wheel; the needle inserting assembly comprises a rotating shaft arranged on the bottom plate, a sliding block which can transversely slide along the rotating shaft and can rotate along with the rotating shaft is arranged on the rotating shaft, a needle cylinder is arranged below the sliding block, and a needle head which slides along the needle cylinder is arranged in the needle cylinder; the needle cylinder corresponds to the fixed rotating wheel and the movable rotating wheel; the fixed rotating wheel is connected with the rotating shaft through a gear transmission assembly.

As an optimized proposal of the utility model, the surfaces of the fixed rotating wheel and the movable rotating wheel are provided with tooth sockets.

As another preferred scheme of the utility model, a thrust spring of the needle head is arranged in the needle cylinder, a wedge-shaped clamp matched with the needle cylinder is arranged on the side surface of the needle head, and a button is arranged on the needle cylinder corresponding to the wedge-shaped clamp; the surface of the needle cylinder is provided with an observation slide way corresponding to the needle head, and the needle head is provided with a convex block matched with the observation slide way.

As a third preferred scheme of the utility model, the movable rotating wheel is connected with the driving rack below the bottom plate; the driving rack is connected with the driven rack through a gear set, and a shifting fork matched with the sliding block is arranged on the driven rack.

Further, the gear set comprises a driving gear matched with the driving rack and a driven gear matched with the driven rack; the transmission ratio of the driving gear and the driven gear enables the moving distance of the driving rack to be twice of the moving distance of the driven rack.

As a fourth preferred scheme of the utility model, a vertical plate is arranged on the bottom plate, and a rat tail inlet hole is arranged on the vertical plate corresponding to the position between the fixed rotating wheel and the driven rotating wheel; the bottom plate is provided with a mouse barrel through a longitudinal slideway, and the mouse barrel is provided with a mouse tail outlet corresponding to the mouse tail inlet.

The utility model has the advantages that: 1. the utility model can lead the tail of the mouse to be clamped between the fixed rotating wheel and the movable rotating wheel to form fixation through the matching of the fixed rotating wheel and the movable rotating wheel; meanwhile, the angle of the needle cylinder can be automatically adjusted through the gear transmission assembly; after the angle of the needle cylinder is adjusted, the function of automatically adjusting the angle can be realized; due to the limitation of the needle cylinder, the needle outlet depth of the needle head is certain, so that the function of automatic needle insertion is realized; greatly reducing the risk that the test mouse is pricked.

2. The tooth grooves are formed in the fixed rotating wheel and the movable rotating wheel, so that the gear can rotate in cooperation with the condyle of the rat tail, and the effect of accurately controlling the angle of the needle cylinder is achieved.

3. Because utility model cylinder and syringe needle's structural feature, through pressing the button, the syringe needle can carry out the needle insertion automatically under thrust spring's effect, avoids the manual needle insertion of people and causes the error.

4. The utility model discloses a cooperation of initiative rack, gear train and driven rack makes slider lateral shifting distance be the half of activity runner lateral shifting distance to guarantee that the syringe needle is all the time just to the center of rat tail, avoid pricking partially.

5. The utility model discloses set up a mouse section of thick bamboo, can carry out the baoding to the mouse, avoid the mouse to move in disorder, or sting the operator.

Drawings

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

Fig. 2 is a front view of the present invention.

Fig. 3 is a bottom view of the present invention.

Fig. 4 is a plan view of the present invention.

Fig. 5 is a sectional view a-a of fig. 4.

Fig. 6 is a sectional view B-B of fig. 5.

Fig. 7 is a schematic structural view of another aspect of the present invention.

In the figure, 1 is a rotating shaft, 2 is a sliding block, 3 is a movable rotating wheel, 4 is a fixed rotating wheel, 5 is a return spring, 6 is a guide block, 7 is a guide groove, 8 is a mouse barrel, 9 is a mouse tail outlet hole, 10 is a fixed beam, 11 is a horizontal bevel gear, 12 is a vertical plate, 13 is a vertical bevel gear, 14 is a toothed belt, 15 is driven straight teeth, 16 is a shifting fork, 17 is a needle barrel, 18 is a button, 19 is a needle head, 20 is a bottom plate, 21 is fixed straight teeth, 22 is a longitudinal slide way, 23 is a driving rack, 24 is a driving gear, 25 is a driven gear, 26 is a driven rack, 27 is a limiting guide shaft, 28 is a thrust spring, 29 is a wedge-shaped clamp, 30 is an observation slide way, and 31 is a convex block.

Detailed Description

The utility model discloses a bottom plate 20 is provided with fixed subassembly of mouse tail and the subassembly of pricking on the bottom plate 20, its characterized in that: the rat tail fixing assembly comprises a fixed rotating wheel 4 arranged on a bottom plate 20, a movable rotating wheel 3 is arranged on the bottom plate 20 and positioned on the side of the fixed rotating wheel 4 through a first sliding groove, and a return spring 5 enabling the movable rotating wheel 3 to lean against the fixed wheel is arranged on the movable rotating wheel 3; the needle inserting assembly comprises a rotating shaft 1 arranged on a bottom plate 20, a sliding block 2 which can transversely slide along the rotating shaft 1 and can rotate along with the rotating shaft 1 is arranged on the rotating shaft 1, a needle cylinder 17 is arranged below the sliding block 2, and a needle head 19 which slides along the needle cylinder 17 is arranged in the needle cylinder 17; the needle cylinder 17 corresponds to the fixed rotating wheel 4 and the movable rotating wheel 3; the fixed rotating wheel 4 is connected with the rotating shaft 1 through a gear transmission assembly.

The gear transmission assembly comprises a horizontal bevel gear 11 fixedly connected with a shaft of the fixed rotating wheel 4, and the horizontal bevel gear 11 is matched with a fixed vertical bevel gear 13; the vertical bevel gear 13 is provided with a fixed straight gear, and the fixed straight gear 21 is connected with a driven straight gear 15 on the rotating shaft 1 through a toothed belt 14.

A tension wheel (not shown) of the toothed belt 14 may be provided on the base plate 20.

As an optimized proposal of the utility model, the surfaces of the fixed rotating wheel 4 and the movable rotating wheel 3 are provided with tooth sockets.

As another preferable scheme of the present invention, a thrust spring 28 of the needle 19 is arranged in the needle cylinder 17, a wedge-shaped clamp 29 matched with the needle cylinder 17 is arranged on the side surface of the needle 19, and a button 18 is arranged on the needle cylinder 17 corresponding to the wedge-shaped clamp 29; the surface of the needle cylinder 17 is provided with an observation slide way corresponding to the needle head 19, and the needle head 19 is provided with a convex block matched with the observation slide way.

As a third preferred solution of the present invention, the movable wheel 3 is connected to the driving rack 23 below the bottom plate 20; the driving rack 23 is connected with a driven rack 26 through a gear set, and a shifting fork 16 matched with the sliding block 2 is arranged on the driven rack 26.

Further, the gear set includes a driving gear 24 engaged with the driving rack 23 and a driven gear 25 engaged with the driven rack 26; the ratio of the drive gear 24 to the driven gear 25 causes the drive rack 23 to move twice the distance that the driven rack 26 moves.

The bottom plate 20 is provided with a limit guide shaft 27 matched with the driving rack 23 and the driven rack 26.

The bottom plate 20 is provided with a fixed beam 10, a guide groove 7 is arranged in the fixed beam 10, the shaft of the movable rotating wheel 3 is connected with a guide block 6, and the guide block 6 is arranged in the guide groove 7; the return spring 5 is disposed between the guide block 6 and the fixed beam 10.

As a fourth preferred embodiment of the present invention, a vertical plate 12 is disposed on the bottom plate 20, and a rat tail inlet hole is disposed on the vertical plate 12 corresponding to a position between the fixed rotating wheel 4 and the driven rotating wheel; the bottom plate 20 is provided with a mouse barrel 8 through a longitudinal slideway 22, and the mouse barrel 8 is provided with a mouse tail outlet hole 9 corresponding to the mouse tail inlet hole.

The whole body of the utility model can be arranged in a shell (not shown), and the shell can protect components such as the driving rack 23 at the bottom of the bottom plate 20; the shell can also be used for fixing the rotating shaft 1, the fixed beam 10 and other parts.

When the utility model is used, firstly, the angle of the needle cylinder 17 is adjusted according to the condition of the experimental mouse; then the lug in the observation slide is pulled to make the needle 19 move against the thrust of the thrust spring 28; when moved into position, the wedge-shaped catch 29 on the needle 19 springs out into engagement with the barrel 17 and the needle 19 is held in place. Then, a mouse is placed into the mouse barrel 8, the tail of the mouse extends out of the mouse tail outlet hole 9 and enters the mouse tail inlet hole, in the mouse tail inlet process, the condyle of the mouse tail is matched with the fixed rotating wheel 4 and the driven rotating wheel, the fixed rotating wheel 4 rotates, the rotating shaft 1 is driven to rotate through the gear transmission assembly, the sliding block 2 rotates along with the rotating shaft 1, and the needle cylinder 17 below the sliding block 2 rotates along with the sliding block, so that the needle inlet angle of the needle cylinder 17 is changed; when the proper position is reached, the button 18 is pressed, the button 18 pushes the wedge-shaped clamp 29 to retract, the wedge-shaped clamp 29 is separated from the locking structure of the needle cylinder 17, the thrust spring 28 ejects the needle 19 to pierce a blood vessel at the tail of the rat, and the pricking work is finished. An operator can observe the needle 19 by using the observation slide way, if blood return does not occur, indicating that the needle insertion fails, the needle 19 can be withdrawn, and then the rat tail is inserted into a condyle and then re-inserted, so that the fault tolerance rate is improved.

The device has the following characteristics: 1. the utility model discloses can divide two kinds of special types of rat and mouse. 2. the utility model discloses possess and observe the slide, blood backward flow after the needle insertion succeeds, can see blood in observing the slide, can set up check valve in the same time needle pipe, and after the blood backward flow, the check valve system closed, prevents that blood from flowing. The one-way valve can be inserted into a needle for administration. The needle is automatically closed after being withdrawn. Preventing contamination and drug leakage. 3. The utility model can be used repeatedly, and can be disinfected by alcohol to prevent cross infection. 4. The utility model discloses cylinder and syringe needle can use glass material or transparent plastic material, all the other all can be stainless steel material, and are durable, anticorrosive. 5. The utility model discloses do not need external power supply, pure mechanical device, do not consume energy, the environmental protection.

It should be understood that the above detailed description of the present invention is only for illustrating the present invention and is not limited by the technical solutions described in the embodiments of the present invention, and those skilled in the art should understand that the present invention can still be modified or equivalently replaced to achieve the same technical effects; as long as the use requirement is satisfied, the utility model is within the protection scope.

Claims

1. The utility model provides a rat tail intravenous route auxiliary device, includes bottom plate (20), is provided with fixed subassembly of rat tail and the subassembly of pricking needle on bottom plate (20), its characterized in that: the mouse tail fixing assembly comprises a fixed rotating wheel (4) arranged on a bottom plate (20), a movable rotating wheel (3) is arranged on the bottom plate (20) and positioned on the side of the fixed rotating wheel (4) through a first sliding groove, and a return spring (5) enabling the movable rotating wheel (3) to lean against the fixed wheel is arranged on the movable rotating wheel (3); the needle inserting assembly comprises a rotating shaft (1) arranged on a bottom plate (20), a sliding block (2) which can transversely slide along the rotating shaft (1) and can rotate along with the rotating shaft (1) is arranged on the rotating shaft (1), a needle cylinder (17) is arranged below the sliding block (2), and a needle head (19) which slides along the needle cylinder (17) is arranged in the needle cylinder (17); the needle cylinder (17) corresponds to the fixed rotating wheel (4) and the movable rotating wheel (3); the fixed rotating wheel (4) is connected with the rotating shaft (1) through a gear transmission assembly.

2. A rat tail vein injection aid according to claim 1, wherein: the gear transmission assembly comprises a horizontal bevel gear (11) fixedly connected with a shaft of the fixed rotating wheel (4), and the horizontal bevel gear (11) is matched with a fixed vertical bevel gear (13); the vertical bevel gear (13) is provided with a fixed straight tooth, and the fixed straight tooth (21) is connected with a driven straight tooth (15) on the rotating shaft (1) through a toothed belt (14).

3. A rat tail vein injection aid according to claim 1, wherein: tooth grooves are formed in the surfaces of the fixed rotating wheel (4) and the movable rotating wheel (3).

4. A rat tail vein injection aid according to claim 1, wherein: a thrust spring (28) of the needle head (19) is arranged in the needle cylinder (17), a wedge-shaped clamp (29) matched with the needle cylinder (17) is arranged on the side surface of the needle head (19), and a button (18) is arranged on the needle cylinder (17) corresponding to the wedge-shaped clamp (29); the surface of the needle cylinder (17) is provided with an observation slide way corresponding to the needle head (19), and the needle head (19) is provided with a convex block matched with the observation slide way.

5. A rat tail vein injection aid according to claim 1, wherein: the movable rotating wheel (3) is connected with a driving rack (23) below the bottom plate (20); the driving rack (23) is connected with a driven rack (26) through a gear set, and a shifting fork (16) matched with the sliding block (2) is arranged on the driven rack (26).

6. A caudal intravenous injection aid as claimed in claim 5, wherein: the gear set comprises a driving gear (24) matched with a driving rack (23) and a driven gear (25) matched with a driven rack (26); the transmission ratio of the driving gear (24) to the driven gear (25) enables the driving rack (23) to move twice as far as the driven rack (26).

7. A rat tail vein injection aid according to claim 1, wherein: and the bottom plate (20) is provided with a limiting guide shaft (27) matched with the driving rack (23) and the driven rack (26).

8. A rat tail vein injection aid according to claim 1, wherein: a fixed beam (10) is arranged on the bottom plate (20), a guide groove (7) is arranged in the fixed beam (10), the shaft of the movable rotating wheel (3) is connected with a guide block (6), and the guide block (6) is arranged in the guide groove (7); the return spring (5) is arranged between the guide block (6) and the fixed beam (10).

9. A rat tail vein injection aid according to claim 1, wherein: a vertical plate (12) is arranged on the bottom plate (20), and a mouse tail inlet hole is formed in the vertical plate (12) corresponding to the position between the fixed rotating wheel (4) and the driven rotating wheel; a mouse barrel (8) is arranged on the bottom plate (20) through a longitudinal slideway (22), and a mouse tail outlet hole (9) is arranged on the mouse barrel (8) corresponding to the mouse tail inlet hole.

10. A rat tail vein injection aid according to claim 1, wherein: the needle tube is internally provided with a one-way valve.