CN108837229A - A kind of air force medical fluid conveying device - Google Patents

Abstract

The invention discloses an aerodynamic liquid medicine delivery device for a clinical medical device. The air power medicine liquid delivery device includes an outer shell, a booster, a protective cover, a one-way valve for adding medicine, a pipeline, a flow stop clip, Microtubes and Luer tubing. The beneficial effect of the invention is that the pressure difference formed by the atmospheric pressure and the pressure inside the booster is used to provide power, the power is constant, and the infusion of the medicinal solution is stable, accurate and safe.

Description

An aerodynamic liquid medicine delivery device

technical field

The invention relates to an aerodynamic liquid medicine delivery device, which belongs to clinical medical equipment.

Background technique

Patients will have different degrees of pain during the operation or during the postoperative recovery period. Appropriate treatment of pain during and after the operation can eliminate the patient's anxiety and fear, improve insomnia, reduce pulmonary and cardiovascular complications, and promote patient rehabilitation. When the doctor treats the patient's pain, he infuses the analgesic drug through the infusion pump to maintain a timely and stable blood drug concentration in the patient's blood to achieve the purpose of safe treatment. Since analgesic drugs are narcotic drugs, they must be infused at a continuous and constant speed in a small amount. At present, the mechanical infusion device used in the hospital mainly injects the drug liquid into the elastic drug bag or silicone balloon inside the device body. , through the elastic contraction force of the elastic capsule or the silicone balloon material as the power to continuously output the medicinal solution.

Chinese invention patent CN204890800U discloses a one-time use adjustable pressure infusion pump, which includes a liquid storage column, a dosing port, and an infusion catheter; a piston is arranged at the bottom of the liquid storage column, and the dosing port has The anti-reflux valve injects medicine into the liquid storage column under the piston through the dosing port; a stud is also arranged in the liquid storage column, and the stud is screwed into the internal thread provided on the upper part of the liquid storage column, and the gap between the piston and the stud is With spring. This one-time use adjustable pressure infusion pump mainly relies on the elastic force of the spring to provide power to the piston. The disadvantage is that the elastic force of the spring will change with the compression deformation of the spring. When the spring compression is large, the rebound force is large. When the compression amount of the spring is small, the rebound force is reduced, resulting in an unsteady power supply and an unsteady influence on the infusion flow rate. There are also infusion pumps powered by elastic capsules or silicone balloons in hospitals, which use the elastic deformation of the material of the storage parts to provide power for infusion. The disadvantage is that the elastic capsules or silicone balloons are filled with At the initial stage of drug solution infusion, due to the filling effect of the drug solution, when the drug storage bag is filled to the maximum, the elastic contraction pressure is the largest. Irregular slowing down, resulting in erratic slowing down of drug infusion rate during infusion. When there is not much liquid left, the pressure of the drug storage sac on the liquid is negligible, and the infusion speed of the liquid drops sharply or stops automatically, resulting in too much residual liquid, which leads to a reduction in the infusion volume and affects the therapeutic effect. Due to the unstable elastic contraction of the elastic balloon, the output pressure is not constant, causing the output flow to be unstable, and the treatment effect is poor. Moreover, the doctors, nurses and patients cannot accurately evaluate the amount of liquid medicine that has been infused into the human body and the remaining amount, which may cause infusion failure. Overdose or insufficient infusion will threaten the safety of life or affect the therapeutic effect.

Contents of the invention

The purpose of the present invention is to provide an aerodynamic liquid medicine delivery device with simple structure, convenient installation and simple operation, which can output medicine liquid with constant power.

In order to solve the above problems, the technical solution of the present invention is: an aerodynamic liquid medicine delivery device, comprising a cylindrical outer shell, the outer shell includes a cylindrical side wall and a lower end wall, and the lower end wall of the outer shell has a liquid medicine through hole , the liquid through hole is connected to one end of the pipeline, the other end of the pipeline is connected to one end of the microtube, the other end of the microtube is provided with a Luer connector, and the microtube and the through hole of the liquid medicine are sequentially provided with flow-stop clips And the dosing one-way valve is characterized in that an air hole is provided in the middle of the side wall of the outer casing, and a booster is arranged in the outer casing, and the booster includes a first piston, a push rod, an inner casing and a second piston, and the circular The cylindrical inner casing is fixedly arranged on the upper end of the outer casing, and the middle part of the lower end wall of the inner casing is provided with a through hole. The first piston is slidably arranged under the inner casing inside the outer casing, and the second piston is slidably arranged on the inner casing. Inside, there is a vertical push rod between the first piston and the second piston, the push rod connects the first piston and the second piston, the upper port of the outer shell is provided with a protective cover with a vent hole, the lower surface of the second piston and the inner shell The body forms a negative pressure chamber, and the lower surface of the first piston and the outer shell form a liquid medicine chamber.

In order to exhaust the air in the negative pressure chamber as much as possible, close to the vacuum as much as possible and facilitate installation, an exhaust one-way valve is provided on the upper surface of the second piston to exhaust upward.

In order to balance the air pressure on the upper surface of the first piston and the external atmospheric pressure, so that the first piston can slide along the inner wall of the outer shell, the vent hole is adjacent to the lower surface of the inner shell, in order to achieve ventilation and ensure that the bacteria in the air entering the device will not pollute the outer shell The wall does not pollute the liquid medicine, and a layer of air-permeable bacteria-resistant film is provided on the air-ventilating hole.

In order to simplify the structure and save cost, the inner shell is fixed on the inner wall of the outer shell so that the inner shell will not slide down along the outer shell. The side wall of the outer shell includes the side wall of the upper shell and the side wall of the lower shell. The inner diameter of the wall is larger than the inner diameter of the side wall of the lower housing.

In order to limit the horizontal offset of the upper end of the ejector rod and make the connection between the second piston and the ejector rod more stable, a groove is provided in the middle of the lower surface of the second piston, and the upper end of the ejector rod is connected to the groove.

In order to strengthen the ejector rod and limit the maximum height of the first piston to rise so that it cannot cover the vent hole on the side wall of the outer casing and ensure the sealing, a protrusion with an inner hole is provided in the middle of the lower surface of the lower end wall of the inner casing, and the ejector rod can Sliding along the inner hole wall of the protrusion, the inner hole wall is provided with a sealing groove, and a sealing ring is arranged in the sealing groove.

In order to strengthen the connection between the protective cover and the outer casing, which is fast and simple and saves costs, the protective cover is connected to the upper end of the outer casing through threads.

In order to enhance the sealing performance between the first piston and the outer casing and between the second piston and the inner casing, sealing rings are provided in the sealing grooves on the outer peripheral surfaces of the first piston and the second piston.

In order to ensure that the liquid medicine in the outer casing enters the pipeline through the liquid medicine through hole, and to strengthen the connection between the outer shell and the pipeline, a cylindrical protrusion is provided in the middle of the lower surface of the lower end wall of the outer shell, and the protrusion connects with the liquid medicine through hole and the pipe. The road forms a pathway.

The manufacturing materials of the present invention only need to meet the medical requirements, for example, the sealing ring can be a medical-grade silicone rubber sealing ring or the like.

The beneficial effects of the invention are: simple and reasonable structure, convenient operation, the use of the exhaust one-way valve makes the device easy to install, the pressure on the second piston is constant, the force area is constant, the pressure on the second piston is constant, and the output flow rate of the liquid medicine Continuous and constant, less affected by external interference, good sealing performance and the use of bacteria-resistant, breathable, breathable and bacteria-resistant membranes to ensure the sterility of the liquid medicine, good infusion treatment effect, and the portable design makes the treatment process independent of position and space There are no restrictions on special skills requirements, which is convenient for patients and medical staff to operate, and is conducive to popularization and application.

Description of drawings

Fig. 1 is a schematic diagram of an aerodynamic liquid medicine delivery device of the present invention.

Figure 2 is a schematic diagram of the booster.

Fig. 3 is an enlarged view of air vents on the side wall of the outer casing.

In the figure: 1. Protective cover; 2. Air vent; 3. Outer casing; 4. Inner casing; 5. Second piston; 6. Exhaust one-way valve; 7. Push rod; 8. First piston; 9 .Sealing ring; 10. Sealing ring; 11. Sealing ring; 12. Booster; 13. Liquid medicine through hole; Valve; 18. Stop clamp; 19. Micro tube; 20. Luer connector; 21. Negative pressure chamber; 22. Liquid medicine chamber.

Detailed ways

As shown in Fig. 1, an aerodynamic liquid medicine delivery device.

An aerodynamic liquid medicine delivery device, comprising a cylindrical outer shell 3, the outer shell 3 includes a cylindrical side wall and a lower end wall, the lower end wall of the outer shell 3 has a liquid medicine through hole 13, and the liquid medicine through hole 13 is connected with the tube One end of the pipeline 16 is connected, the other end of the pipeline 16 is connected with one end of the microtube 19, the other end of the microtube 19 is provided with a Luer connector 20, and the microtube 19 and the liquid through hole 13 are sequentially provided with a stop clip 18 and the dosing check valve 17, it is characterized in that, the middle part of the side wall of the outer casing 3 is provided with a vent hole 15, and a booster 12 is arranged in the outer casing 3, and the booster 12 includes a first piston 8, a push rod 7 , the inner casing 4 and the second piston 5, the cylindrical inner casing 4 is fixedly arranged on the upper end of the outer casing 3, the middle part of the lower end wall of the inner casing 4 is provided with a through hole, and the first piston 8 is slidably arranged on the outer casing 3. Between the inside and the bottom of the inner casing 4, the second piston 5 is slidably arranged inside the inner casing 4. A push rod 7 is vertically arranged between the first piston 8 and the second piston 5. The upper port of the outer casing 3 is provided There is a protective cover 1 with a vent hole 2 , the lower surface of the second piston 5 and the inner housing 4 form a negative pressure chamber 21 , and the lower surface of the first piston 8 and the outer housing 3 form a liquid medicine chamber 22 .

The upper surface of the second piston 5 is provided with an exhaust check valve 6 for upward exhaust.

The air vent 15 is adjacent to the lower surface of the inner casing 4, and a layer of air-permeable bacteria-resistant film 14 is arranged on the air vent 15.

The side wall of the outer shell 3 includes an upper shell side wall and a lower shell side wall, and the inner diameter of the upper shell side wall is larger than the inner diameter of the lower side wall.

The middle part of the lower surface of the second piston 5 is provided with a groove, the upper end of the ejector rod 7 is connected with the groove, and the middle part of the lower surface of the lower end wall of the inner housing 4 is provided with a protrusion with an inner hole, and the ejector rod 7 can move along the protrusion. The wall of the inner hole slides, and the wall of the raised inner hole is provided with a sealing groove, and a sealing ring 10 is arranged in the sealing groove.

The protective cover 1 is screwed to the upper end of the outer shell 3 .

A sealing ring 11 is provided in the sealing groove on the outer peripheral surface of the first piston 8 , and a sealing ring 9 is provided in the sealing groove on the outer peripheral surface of the second piston 5 .

A cylindrical protrusion is provided in the middle of the lower surface of the lower end wall of the outer casing 3 , and the protrusion forms a passage with the liquid medicine through hole 13 and the pipeline 16 .

The working process of this example: when an aerodynamic liquid medicine delivery device of the present invention is installed, the first piston 8 is pushed to the bottom of the outer shell 3, the second piston 5 is pushed to the bottom of the inner shell 4, and the air in the negative pressure chamber 21 passes through the exhaust The gas check valve 6 is discharged, and the stop clip 18 is closed during use, and the medicine is added to the medicine adding check valve 17. The medicine liquid enters the medicine liquid chamber 22 at the lower part of the outer shell 3 through the pipeline 16, and the first piston 8 receives the medicine liquid. When the external force acts upward, the air on the upper surface of the first piston 8 is discharged through the air hole 15 on the side wall of the outer shell 3, and at the same time, the ejector rod 7 drives the second piston 5 to overcome the atmospheric pressure and move upward along the inner wall of the inner shell 4. The air on the upper surface of the second piston 5 in the device is discharged through the vent hole 2, and the negative pressure chamber 21 forms a negative pressure state. When the medicinal solution is infused into the patient's body, the stop clip 18 is opened, and the second piston 5 is subjected to pressure under the action of atmospheric pressure. Constant pressure, the second piston 5 moves downward along the inner wall of the inner housing 4, driving the ejector rod 7 and the first piston 8 to move downward, and the outside air enters the device through the air-permeable bacteria-resistant film 14 of the air vent 15 on the side wall of the outer housing 3, The first piston 8 extrudes the liquid medicine injection pipeline 16 and the microtube 19 in the liquid medicine cavity 22 , flows into the catheter on the patient's body connected to the Luer connector 20 after the flow is limited by the microtube 19 , and enters the patient's body.

An embodiment of the present invention has been described in detail above, but the content described is only a preferred embodiment of the present invention, and cannot be considered as limiting the implementation scope of the present invention. All equivalent changes and improvements made according to the application scope of the present invention shall still belong to the scope covered by the patent of the present invention.

Claims (8)

1. a kind of air force medical fluid conveying device, including columnar outer housing, outer housing include cylinder side wall and lower end Wall, outer housing lower end wall have liquid through-hole, and liquid through-hole is connected with pipeline one end, the other end of pipeline and one end of micro tube It is connected, the micro tube other end is equipped with female Luer, and flow-stopping clip is successively arranged between micro tube and liquid through-hole and dosing is unidirectional Valve, which is characterized in that be equipped with air hole in the middle part of shell body sidewall, a boost motor is equipped in outer housing, boost motor includes first Piston, mandril, inner housing and second piston, columnar inner housing are fixedly installed on outer housing upper end, in inner housing lower end wall Portion is equipped with through-hole, and first piston is slidably arranged on inside outer housing below inner housing, and second piston is slidably arranged on Inside inner housing, vertical between first piston and second piston to be equipped with mandril, outer housing upper port is equipped with the guarantor with venthole Protecting cover.

2. a kind of air force medical fluid conveying device according to claim 1, it is characterised in that：Table in the second piston Face is equipped with an exhaust check valve being vented upwards.

3. a kind of air force medical fluid conveying device according to claim 2, it is characterised in that：The air hole is close to interior Housing lower surface, air hole are equipped with one layer of ventilative resistance mycoderm.

4. a kind of air force medical fluid conveying device according to claim 3, it is characterised in that：The shell body sidewall packet Upper casing body sidewall and lower casing body sidewall are included, upper casing body sidewall internal diameter is greater than lower wall internal diameter.

5. a kind of air force medical fluid conveying device according to claim 4, it is characterised in that：The second piston following table Middle face is equipped with a groove, and mandril upper end is connected with groove, and one is equipped in the middle part of inner housing lower end wall lower surface with inner hole Protrusion, mandril can be slided along raised inner hole wall, which is equipped with seal groove, be equipped with sealing ring in seal groove.

6. a kind of air force medical fluid conveying device according to claim 1-5, it is characterised in that：The protection Lid is connected through a screw thread with outer housing upper end.

7. according to a kind of described in any item air force medical fluid conveying devices of claim 6, it is characterised in that：Described first is living Sealing ring is equipped in seal groove on plug and second piston outer circumference surface.

8. according to a kind of described in any item air force medical fluid conveying devices of claim 7, it is characterised in that：The outer housing A cylinder-shaped protrusion is equipped in the middle part of lower end wall lower surface, protrusion forms access with liquid through-hole and pipeline.