CN108404259B

CN108404259B - Medical syringe capable of limiting liquid pushing speed

Info

Publication number: CN108404259B
Application number: CN201810187454.2A
Authority: CN
Inventors: 梁楠
Original assignee: Sino Russian International Medical Research Co ltd
Current assignee: Sino Russian International Medical Research Co.,Ltd.
Priority date: 2018-03-07
Filing date: 2018-03-07
Publication date: 2020-08-14
Anticipated expiration: 2038-03-07
Also published as: CN108404259A

Abstract

The invention relates to a medical injector for limiting the liquid pushing speed, which comprises a needle cylinder and a needle head, the syringe needle is arranged at the left end of the syringe, the syringe needle is provided with a first inner cavity and a second inner cavity, the piston can be arranged in the first inner cavity in a sliding mode, the push rod is provided with a disc arranged on the right side of the piston, the disc is provided with a plurality of sliding grooves distributed circumferentially, springs and sliding blocks are arranged in the sliding grooves, the disc is provided with a rotatable cam, the sliding blocks slide under the elastic force action of the springs and are in extrusion contact with the outer edge surface of the cam, a second push rod is arranged in the second inner cavity, the left end of the second push rod is provided with a turbofan, the first push rod and the second push rod are connected through a pressing handle arranged on the right side of the syringe, a first gear and a second gear are arranged on the pressing handle, the first gear is in transmission connection with the second gear, a sleeve is arranged on the first push rod, two ends of the sleeve are respectively connected with the cam and the first gear, and the.

Description

Medical syringe capable of limiting liquid pushing speed

Technical Field

The invention relates to the field of medical supplies, in particular to a medical injector for limiting the liquid pushing speed.

Background

The medical injector is used as a convenient and fast medicine leading-in device, and is widely used in the treatment process of various diseases because the medical injector generally does not cause other adverse symptoms of patients after being used and does not cause large sores.

However, in the injection process of some specific drugs, due to the influence of the pharmacological action of the drugs, the administration speed, i.e. the injection speed, needs to be slowed down so as not to cause strong discomfort or local allergic reaction of patients; in addition, when intramuscular injection or subcutaneous injection is carried out, the patient feels obvious pain due to the excessively high injection speed, local swelling and stiffness are caused, and unexpected worry and trouble are easily brought to the patient; once the injection is carried out, long-time pain and local discomfort are caused, so that the patient can generate serious rejection emotion to the injection treatment, and the similar treatment means is not facilitated to be implemented in the future.

Although medical staff will try to avoid the above adverse reactions in the treatment process, at present, the drug injection is mainly carried out manually, so that the control of the injection speed and the injection force is difficult to unify and quantify, and different degrees of pain and local reactions are inevitably generated.

Disclosure of Invention

Aiming at the situation, in order to make up for the technical defects in the prior art, the invention provides a medical injector for limiting the liquid pushing speed, so as to solve the problem that the injection speed and the injection force of the existing medical injector are difficult to control, so that a patient may suffer from serious pain and local discomfort.

The technical scheme for solving the problem is as follows: the syringe needle is arranged at the left end of the syringe, the syringe needle is provided with a first inner cavity and a second inner cavity which are horizontally arranged and parallel to each other, the piston is slidably arranged in the first inner cavity, and the left end of the first push rod is connected with the piston to form a structure that the first push rod drives the piston to slide in the first inner cavity; the first push rod is provided with a disc which is coaxial with the first push rod, the disc is arranged on the right side of the piston, the outer edge surface of the disc is provided with a plurality of sliding grooves which are radially arranged along the axis of the disc and are distributed circumferentially, springs and slidable sliding blocks are arranged in the sliding grooves, the disc is provided with a rotatable cam which is coaxial with the first push rod, the sliding blocks slide towards the axis direction of the disc under the action of the elastic force of the springs and are in extrusion contact with the outer edge surface of the cam, and when the cam rotates on the disc, the cam pushes the sliding blocks to slide towards the direction far away from the axis of the disc and is in extrusion contact with the inner wall of the first inner cavity; a second push rod which is consistent with the first push rod in length direction is arranged in the second inner cavity, a turbofan which is arranged in the second inner cavity is installed at the left end of the second push rod, the turbofan and the second inner cavity are coaxially arranged and can slide in the second inner cavity, gas in the second inner cavity at the left side and the right side of the turbofan circulates through a duct of the turbofan, the right end of the first push rod and the right end of the second push rod are connected through a pressing handle which is arranged at the right side of the needle cylinder, a first gear which is coaxially arranged with the first push rod and a second gear which is coaxially arranged with the turbofan are arranged on the pressing handle, and the first gear is in transmission connection with the second gear to form a structure that the first gear and the second gear rotate simultaneously; the first push rod is sleeved with a rotatable sleeve which is coaxial with the first push rod, the left end of the sleeve is connected with the cam, and the right end of the sleeve is connected with the first gear to form a structure that the first gear and the cam rotate synchronously; the turbofan is coaxially connected with the second gear through the transmission shaft.

The invention has smart structure and simple operation, the friction force between the slide block and the inner wall of the needle cylinder is continuously changed according to the change of the injection speed, the effective limitation of the injection speed is realized, no matter how the thrust applied on the pressing handle is increased, the correspondingly increased friction resistance is always used for reducing the acceleration of the injection speed, and the injection speed can not generate sudden large-range change.

Drawings

Fig. 1 is a front view of the present invention.

FIG. 2 is a cross-sectional view of the invention A-A.

FIG. 3 is an isometric cross-sectional view of the present invention.

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

As shown in fig. 1 to 3, the syringe comprises a syringe 1, a needle 2, a piston 3 and a first push rod 4, wherein the axis of the syringe 1 is horizontally arranged, the needle 2 is arranged at the left end of the syringe 1, the syringe 1 is provided with a first inner cavity 5 and a second inner cavity 6 which are horizontally arranged and parallel to each other, the piston 3 is slidably arranged in the first inner cavity 5, and the left end of the first push rod 4 is connected with the piston 3, so that a structure that the first push rod 4 drives the piston 3 to slide in the first inner cavity 5 is formed; the first push rod 4 is provided with a disc 7 which is coaxial with the first push rod 4, the disc 7 is arranged on the right side of the piston 3, the outer edge surface of the disc 7 is provided with a plurality of sliding grooves 8 which are radially arranged along the axis of the disc 7 and are distributed circumferentially, a spring 9 and a slidable sliding block 10 are arranged in each sliding groove 8, the disc 7 is provided with a rotatable cam 11 which is coaxial with the first push rod 4, the sliding block 10 slides towards the axis direction of the disc 7 under the action of the elastic force of the spring 9 and is in extrusion contact with the outer edge surface of the cam 11, and when the cam 11 rotates on the disc 7, the cam 11 pushes the sliding block 10 to slide towards the direction far away from the axis of the disc 7 and is in extrusion contact with the inner wall of the first inner; a second push rod 12 which is consistent with the first push rod 4 in length direction is arranged in the second inner cavity 6, a turbofan 13 which is arranged in the second inner cavity 6 is installed at the left end of the second push rod 12, the turbofan 13 and the second inner cavity 6 are coaxially arranged and can slide in the second inner cavity 6, gas in the second inner cavities 6 at the left side and the right side of the turbofan 13 circulates through a duct of the turbofan 13, the right end of the first push rod 4 and the right end of the second push rod 12 are connected through a pressing handle 14 which is arranged at the right side of the syringe 1, a first gear 15 which is coaxially arranged with the first push rod 4 and a second gear 16 which is coaxially arranged with the turbofan 13 are arranged on the pressing handle 14, and the first gear 15 is in transmission connection with the second gear 16 to form a structure that the first gear 15 and the second gear 16 rotate simultaneously; the first push rod 4 is sleeved with a rotatable sleeve 17 which is coaxial with the first push rod 4, the left end of the sleeve 17 is connected with the cam 11, and the right end of the sleeve 17 is connected with the first gear 15 to form a structure that the first gear 15 and the cam 11 rotate synchronously; the turbofan 13 is coaxially connected with the second gear 16 through a transmission shaft 18.

Preferably, the outer edge surface of the cam 11 is composed of a plurality of convex parts corresponding to the sliders 10 one by one and smooth parts smoothly connected between two adjacent convex parts, and the sliders 10 slide in the axial direction of the disc 7 under the elastic force of the springs 9 and are in pressing contact with the smooth parts of the cam 11.

Preferably, the turbofan 13 is coaxially disposed with the second push rod 12, and the transmission shaft 18 rotatably penetrates the second push rod 12.

Preferably, the pressing handle 14 is provided with a third gear 19, and the third gear 19 is meshed with the first gear 15 and the second gear 16 simultaneously, so that the first gear 15 and the second gear 16 rotate simultaneously through the transmission of the third gear 19.

Preferably, the cylinder 1 has a check valve 20 disposed at the left side of the second chamber 6, and the external air is introduced into the second chamber 6 through the check valve 20.

Preferably, the right end of the syringe 1 is provided with a first through hole 21 for communicating the first cavity 5 with the outside of the syringe 1 and a second through hole 22 for communicating the second cavity 6 with the outside of the syringe 1.

Preferably, the right end of the syringe 1 is provided with a flange 23, and the flange 23 can provide effective force support when drawing or injecting the liquid medicine.

When the liquid medicine extracting device is used, firstly, liquid medicine is extracted, the outer edge boss 23 is used as a stress supporting point, the pressing handle 14 is pulled outwards to enable the first push rod 4 and the second push rod 12 to respectively drive the first piston 3 and the turbofan 13 to slide, negative pressure is generated in the first inner cavity 5 on the left side of the first piston 3, the liquid medicine is sucked into the first inner cavity 5, negative pressure is generated in the second inner cavity 6 on the left side of the turbofan 13, and external air can enter the second inner cavity 6 through the one-way valve 20; meanwhile, high pressure is generated in the first inner cavity 5 on the right side of the first piston 3 to enable air to be discharged through the first through hole 21, high pressure is generated in the second inner cavity 6 on the right side of the turbofan 13 to enable a part of air to be discharged through the second through hole 22, the other part of air enters the second inner cavity 6 on the left side of the turbofan 13 through a duct of the turbofan 13, and the air circulation process enables the liquid medicine extraction process not to be influenced by resistance of air pressure change in the first inner cavity 5 and the second inner cavity 6.

When injecting medicine, the first index finger and the middle finger are used to clamp the syringe 1, the outer edge boss 23 is the stress supporting point, the pressing handle 14 is pushed to make the first push rod 4 drive the first piston 3 to slide in the first inner cavity 5, at the same time, the second push rod 12 drives the turbofan 13 to slide in the second inner cavity 6, the medicine is pressed into the pinhead 2 by the first piston 3 under the pressure effect generated by the external thrust and enters the human body through the pinhead 2, at this time, because of the one-way circulation characteristic of the one-way valve 20, the gas in the second inner cavity 6 at the left side of the turbofan 13 is compressed by the turbofan 13 and can not be discharged through the one-way valve 20, therefore, the part of the compressed gas is forced to enter the duct of the turbofan 13, and because of the air pressure effect of the compressed gas, when the compressed gas flows through the duct of the turbofan 13, the fan blades of the turbofan 13 are subject to the air pressure effect to generate movement, thereby making, the cam 11 is rotated by the transmission action of the transmission shaft 18, the second gear 16, the third gear 19, the first gear 15 and the sleeve 17.

Because of the elasticity of the spring 9, the sliding block 10 is pressed and contacted with the cam 11 to generate friction force, so the friction force generated by the pressing of the sliding block 10 is overcome to rotate the cam 11; when the injection speed is low, the compression speed of the turbofan 13 to the air in the second inner cavity 6, that is, the compression amount of the air in unit time is low, the air pressure received by the blades of the turbofan 13 is low and is not enough to overcome the friction force between the cam 11 and the slider 10, and therefore the turbofan 13 does not rotate.

When the thrust applied to the pressure handle 14 increases and the injection speed increases, the compression speed of the turbofan 13 on the air in the second inner cavity 6 increases, the air pressure borne by the fan blades of the turbofan 13 increases along with the increase of the air pressure and gradually overcomes the friction force between the cam 11 and the slider 10, so that the turbofan 13 drives the cam 11 to rotate; the rotation of the cam 11 causes the sliding block 10 and the convex part of the cam 11 to generate friction sliding, the convex part of the cam 11 pushes the sliding block 10 to slide in the direction away from the axis of the disc 7 and generate extrusion force on the sliding block 10, the sliding of the sliding block 10 causes the sliding block 10 to be in extrusion contact with the inner wall of the first inner cavity 5 and generate friction force, and further, the moving speed of the disc 7 and the first push rod 4 is reduced, and the injection speed is reduced or the acceleration of the injection speed is reduced.

The higher the injection speed, the higher the compression speed of the gas in the second cavity 6, and the higher the gas pressure, the larger the rotation torque generated by the turbofan 13, so the extrusion force of the convex part of the cam 11 to the slider 10 is increased, the extrusion force between the slider 10 and the first cavity 5 is increased accordingly, the friction force between the slider 10 and the first cavity 5 is further increased, and the process of reducing or increasing the injection speed is slowed down and gradually tends to be stable.

Meanwhile, when liquid medicine is injected, due to the communication of the first through hole 21 and the second through hole 22, the first inner cavity 5 on the right side of the first piston 3 and the second inner cavity 6 on the right side of the turbofan 13 are always communicated with the outside air, so that negative pressure cannot be generated in the partial cavity due to the sliding of the first piston 3 and the turbofan 13, the liquid medicine injection process is smooth, and unnecessary resistance cannot be applied.

When the pushing force applied to the pressing handle 14 is reduced to slow down the injection speed, the friction force between the slider 10 and the inner wall of the first inner cavity 5 is reduced or eliminated, so that the resistance force during injection is reduced or eliminated, and even if the pushing force is reduced, since the larger resistance force does not need to be overcome, a stable injection effect can be obtained, and the injection speed cannot be suddenly reduced or stopped greatly.

The invention has smart structure and convenient use, the compression amount of the gas in the second inner cavity on the left side of the turbofan in unit time is continuously changed to generate different gas pressure according to the change of the injection speed, and the rotating speed and the torsion of the turbofan also generate corresponding changes to enable the extrusion force applied to the sliding block by the cam to be changed, thereby changing the friction force between the sliding block and the inner wall of the needle cylinder and realizing the effective limitation of the injection speed; meanwhile, the larger the thrust applied on the pressing handle is, the larger the friction force between the sliding block and the inner wall of the needle cylinder is, so that the injection speed is reduced or accelerated, therefore, no matter how the thrust applied on the pressing handle is increased, correspondingly increased friction resistance is always provided to reduce the acceleration of the injection speed, the injection speed cannot be changed suddenly in a large range, the pain and the discomfort brought to a patient by the sharp and large-range change of the injection speed can be effectively relieved, the liquid pushing force of medical staff can be not controlled carefully, and the injection speed cannot be obviously changed even if the liquid pushing speed is changed in a set range.

In addition, because the compressed gas in the second inner cavity can only be discharged through the bypass of the turbofan in the injection process, different speed limiting effects can be obtained by setting the size of the bypass so as to meet different use requirements.

Claims

1. A medical injector for limiting the liquid pushing speed comprises a needle cylinder (1) with a horizontally arranged axis, a needle head (2), a piston (3) and a first push rod (4), and is characterized in that the needle head (2) is arranged at the left end of the needle cylinder (1), a first inner cavity (5) and a second inner cavity (6) which are horizontally arranged and parallel to each other are arranged on the needle cylinder (1), the piston (3) is slidably arranged in the first inner cavity (5), and the left end of the first push rod (4) is connected with the piston (3) to form a structure that the first push rod (4) drives the piston (3) to slide in the first inner cavity (5); the first push rod (4) is provided with a disc (7) which is coaxial with the first push rod (4), the disc (7) is arranged on the right side of the piston (3), the outer edge surface of the disc (7) is provided with a plurality of sliding chutes (8) which are radially arranged along the axis of the disc (7) and are circumferentially distributed, the sliding chutes (8) are internally provided with springs (9) and slidable sliding blocks (10), the disc (7) is provided with a rotatable cam (11) which is coaxial with the first push rod (4), and the sliding blocks (10) slide towards the axis direction of the disc (7) under the elastic force action of the springs (9) and are in extrusion contact with the outer edge surface of the cam (11); a second push rod (12) which is consistent with the first push rod (4) in length direction is arranged in the second inner cavity (6), a turbofan (13) which is arranged in the second inner cavity (6) and can slide in the second inner cavity (6) is installed at the left end of the second push rod (12), gas in the second inner cavity (6) at the left side and the right side of the turbofan (13) circulates through a duct of the turbofan (13), the right end of the first push rod (4) is connected with the right end of the second push rod (12) through a pressure handle (14) which is arranged at the right side of the needle cylinder (1), a first gear (15) which is coaxial with the first push rod (4) and a second gear (16) which is coaxial with the turbofan (13) are arranged on the pressure handle (14), and the first gear (15) is in transmission connection with the second gear (16); the first push rod (4) is sleeved with a rotatable sleeve (17) which is coaxial with the first push rod (4), the left end of the sleeve (17) is connected with the cam (11), and the right end of the sleeve (17) is connected with the first gear (15) to form a structure that the first gear (15) and the cam (11) synchronously rotate; the turbofan (13) is coaxially connected with the second gear (16) through a transmission shaft (18); the needle cylinder (1) is provided with a one-way valve (20) arranged on the left side of the second inner cavity (6).

2. The medical injector for limiting the liquid pushing speed according to claim 1, wherein the outer edge surface of the cam (11) is composed of a plurality of convex portions corresponding to the slide blocks (10) one by one and a smooth portion smoothly connected between two adjacent convex portions.

3. The medical injector for limiting the injection speed according to claim 1, wherein the turbofan (13) is coaxially arranged with the second push rod (12), and the transmission shaft (18) rotatably penetrates through the second push rod (12).

4. A medical injector for limiting the injection speed according to claim 1, characterized in that the pressure handle (14) is provided with a third gear (19), and the third gear (19) is meshed with the first gear (15) and the second gear (16) simultaneously.

5. A medical injector for limiting the liquid injection speed according to claim 1, characterized in that the right end of the syringe (1) is provided with a first through hole (21) for communicating the first cavity (5) with the outside of the syringe (1) and a second through hole (22) for communicating the second cavity (6) with the outside of the syringe (1).

6. A medical injector for limiting the injection speed according to claim 1, characterized in that the right end of the syringe (1) has a peripheral ledge (23).