Portable micro-injection pump for subcutaneous administration

Abstract

The utility model relates to the technical field of micro-injection pumps, and discloses a portable micro-injection pump for subcutaneous administration, which comprises a pump shell, the front side and the rear side of the inner wall of the pump shell are both provided with storage bins, the inner walls of the two storage bins are both connected with needle cylinders in a sliding manner, the left sides of the inner walls of the two needle cylinders are both connected with piston rods in a sliding manner, and the piston rods are arranged in the pump shell. Pushing devices are fixedly connected to the front side and the rear side of the left end of the inner wall of the pump shell, a positioning block is fixedly connected to the bottom of the outer wall of a piston rod on the front side, a light touch switch is fixedly connected to the bottom of the inner wall of a storage bin on the front side, and the right ends of the two needle cylinders communicate with a three-way pipe. According to the utility model, the piston rod on the rear side is pushed by the pusher on the rear side to extrude the sterile normal saline or the sterilized injection water, so that the residual liquid medicine in the hose is extruded, and the liquid medicine in the hose is ensured to enter a human body; therefore, the problem that after an existing syringe is used for injection, medicine still remaining in a hose cannot be injected into subcutaneous tissue of a patient is solved.

Description

Technical Field

[0001] This utility model relates to the field of microinjection pump technology, and in particular to a portable microinjection pump for subcutaneous drug delivery. Background Technology

[0002] In the medical field, for some patients who require long-term, continuous, and precise drug administration, a continuous and stable infusion of drugs is needed to maintain the required drug concentration in the body to achieve the desired therapeutic effect. Manual injection is difficult to meet the requirement of precise drug administration at a fixed rate within a specified time. Therefore, a micro-infusion pump is needed.

[0003] Existing microinfusion pumps are typically used for injections of doses larger than 20 ml. However, with the emergence of new drug formulations, the demand for injections of drugs smaller than 20 ml has increased in clinical practice. For example, trastuzumab subcutaneously is administered as a 600 mg / vial (5 ml) for targeted therapy of breast cancer. Pertuzumab subcutaneous injection is available in two strengths: 1200 mg + 600 mg (15 ml) and 600 mg + 600 mg (10 ml). To avoid non-uniform diffusion of the drug in subcutaneous tissue leading to poor absorption and swelling, the drug instructions require that injections be made from 20 ml or less, depending on the dosage and drug characteristics. For injections of varying speeds from 1 minute to 8 minutes, the commonly used device that meets this requirement is the microinfusion pump. However, existing microinfusion pumps are usually single pumps used for injections of doses greater than 20 ml. Therefore, the residual medication in the tubing connecting the microinfusion pump and the needle is usually negligible or requires manual operation by medical staff to push the remaining fluid to ensure adequate drug delivery. This tubing is usually 10-15 cm in diameter with a volume of about 1 ml. In injection scenarios of less than 15 ml, the 1 ml dose ratio may affect the efficacy. Therefore, it is necessary to develop a microinfusion pump specifically for injection scenarios of less than 15 ml for the above-mentioned types of drugs. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a portable micro-injection pump for subcutaneous drug delivery, aiming to improve the problem in the prior art where the drug in the syringe is squeezed out but the drug in the tubing still remains and cannot be injected into the patient's subcutaneous tissue, and the drug in the tubing is enough to affect the efficacy, thus reducing the effect of the injected drug.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a portable micro-injection pump for subcutaneous drug delivery, comprising a pump housing, storage compartments on the front and rear sides of the inner wall of the pump housing, syringes slidably connected to the inner walls of the two storage compartments, piston rods slidably connected to the left sides of the inner walls of the two syringes, pushers fixedly connected to the front and rear sides of the left end of the inner wall of the pump housing, a positioning block fixedly connected to the bottom of the outer wall of the front piston rod, a tactile switch fixedly connected to the bottom of the inner wall of the front storage compartment, a three-way tube connected to the right ends of the two syringes, an electric regulating valve fixedly connected to the middle of the outer wall of the three-way tube, a flexible tube connected to the other end of the three-way tube, a needle fixedly connected to the other end of the flexible tube, adjusting straps provided on the left and right sides of the bottom of the pump housing, quick-connect mechanisms provided on the right ends of the two adjusting straps, and multiple quick-connect mechanisms for connecting the pump housing and the adjusting straps.

[0006] As a further description of the above technical solution:

[0007] The quick-release mechanism includes two retaining seats, which are fixedly connected to both ends of the adjusting belt. The bottom of the pump housing has slots around its perimeter, and multiple retaining seats engage with their corresponding slots. Each retaining seat has a pre-drilled hole on its far side, and a retaining block is slidably connected to the inner wall of each pre-drilled hole. Each slot has a second pre-drilled groove on its adjacent side, and the retaining blocks engage with their corresponding second pre-drilled grooves. Each retaining block has a spring fixedly connected to its adjacent side, and the other end of each spring is fixedly connected to the pre-drilled hole. A lever is fixedly connected to the front side of the outer wall of each retaining block.

[0008] As a further description of the above technical solution:

[0009] The bottom of the pump casing is provided with a clamping plate, and the outer wall of the clamping plate is threaded with a plurality of screws. The clamping plate is threadedly connected to the pump casing through the screws.

[0010] As a further description of the above technical solution:

[0011] Both storage compartments have a reserved slot on the right side of their inner walls, and the inner walls of both reserved slots are equipped with protective plates, which engage with the corresponding reserved slots.

[0012] As a further description of the above technical solution:

[0013] A battery slot is provided on the front side of the outer wall of the pump housing. A protective cover is rotatably connected to the front side of the outer wall of the pump housing. A screw is threadedly connected to the right side of the outer wall of the protective cover. The protective cover is threadedly connected to the pump housing through the screw.

[0014] As a further description of the above technical solution:

[0015] A control board is fixedly connected to the top center of the pump casing, and a display is fixedly connected to the inner wall of the control board.

[0016] As a further description of the above technical solution:

[0017] A mounting base is fixedly connected to the top right side of the pump casing, and an alarm light is fixedly connected to the inner wall of the mounting base.

[0018] As a further description of the above technical solution:

[0019] Multiple power indicator lights are fixedly connected to the top front side of the outer wall of the control panel, and each power indicator light is electrically connected to the battery compartment.

[0020] This utility model has the following beneficial effects:

[0021] 1. In this utility model, after the medicine is squeezed out, the positioning block touches the touch switch, thereby controlling the pusher on the rear side to push the piston rod on the rear side to squeeze the saline solution. The saline solution squeezes out the remaining medicine in the tubing, thereby ensuring that the medicine in the tubing enters the human body and that the human body can be injected with a sufficient amount of medicine. This solves the problem that existing syringes leave medicine in the tubing after injection, which cannot be injected into the patient's subcutaneous tissue, and avoids the problem of insufficient dosage due to drug residue in the tubing.

[0022] 2. In this utility model, by cooperating the card seats at both ends of the adjusting belt with the card slots at the bottom of the pump housing, the card block is squeezed by the inner wall of the card slot to retract. When the card seat is pushed to the appropriate position, the card block pops out under the action of the spring force and locks into the reserved slot two, realizing the quick engagement of the adjusting belt and the pump housing, which facilitates the fixing and carrying of the injection pump. Attached Figure Description

[0023] Figure 1 A perspective view of a portable micro-injection pump for subcutaneous drug delivery proposed in this utility model;

[0024] Figure 2 This is a partial structural exploded view of a portable micro-injection pump for subcutaneous drug delivery proposed in this utility model;

[0025] Figure 3 This is a cross-sectional view of the pump housing of a portable micro-injection pump for subcutaneous drug delivery proposed in this utility model.

[0026] Figure 4 This is a partial structural diagram of a portable micro-injection pump for subcutaneous drug delivery proposed in this utility model;

[0027] Figure 5This is a schematic diagram of the quick-release mechanism of a portable micro-injection pump for subcutaneous drug delivery proposed in this utility model.

[0028] Legend:

[0029] 1. Pump housing; 2. Quick-release mechanism; 201. Card holder; 202. Card slot; 203. Reserved hole; 204. Card block; 205. Reserved slot two; 206. Spring; 207. Paddle; 3. Storage compartment; 4. Syringe; 5. Piston rod; 6. Pusher; 7. Positioning block; 8. Tactile switch; 9. T-connector; 10. Hose; 11. Needle; 12. Adjusting belt; 13. Clamping plate; 14. Screw one; 15. Reserved slot one; 16. Protective plate; 17. Battery slot; 18. Protective cover; 19. Screw two; 20. Control board; 21. Display; 22. Mounting base; 23. Alarm light; 24. Power indicator; 25. Electric regulating valve. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] Reference Figure 1 , Figure 2 and Figure 3This utility model provides an embodiment of a portable micro-injection pump for subcutaneous drug delivery, comprising a pump housing 1, which serves as the outer shell of the entire device and provides a mounting base for other components. Storage compartments 3 are provided on both the front and rear sides of the inner wall of the pump housing 1. Syringes 4 are slidably connected to the inner walls of both storage compartments 3. The front syringe 4 is used to draw medication, and the rear syringe 4 is used to draw saline solution. The storage compartments 3 provide a mounting base for the syringes 4. Piston rods 5 are slidably connected to the left side of the inner walls of both syringes 4. Pulling the piston rods 5 to the left allows the medication to be drawn... Inside the syringe 4, pushers 6 are fixedly connected to the front and rear sides of the left end of the inner wall of the pump housing 1. Pushers 6 are used to push the piston rod 5. A positioning block 7 is fixedly connected to the bottom of the outer wall of the front piston rod 5. A tactile switch 8 is fixedly connected to the bottom of the inner wall of the front storage compartment 3. When the front pusher 6 pushes the front piston rod 5 to move, the positioning block 7 moves with the front piston rod 5. When the positioning block 7 touches the tactile switch 8, the rear pusher 6 is activated and begins to push the rear piston rod 5 to move, thereby squeezing the saline solution. The right ends of the two syringes 4 are connected by a three-way tube 9. An electric regulating valve 25 is fixedly connected to the middle of the outer wall of the three-way tube 9. The electric regulating valve can control the flow direction of the liquid in the two syringes 4. The other end of the three-way tube 9 is connected to a flexible tube 10, which serves as the flow path for the drug solution. The other end of the flexible tube 10 is fixedly connected to a needle 11. Adjusting straps 12 are provided on both the left and right sides of the bottom of the pump housing 1. The adjusting straps 12 facilitate the patient to fix the device. A quick-connect mechanism 2 is provided on the right end of each of the two adjusting straps 12. Multiple quick-connect mechanisms 2 are used to connect the pump housing 1 and the adjusting straps 12. The bottom of the pump housing 1 is provided with There is a clamping plate 13, and multiple screws 14 are threadedly connected to the outer wall of the clamping plate 13. The clamping plate 13 is threadedly connected to the pump housing 1 through the screws 14. The clamping plate 13 can be used to lock the device in a specific position on the clothing. The inner right side of the inner wall of the two storage compartments 3 is provided with a reserved slot 15. The inner wall of the two reserved slots 15 is provided with a protective plate 16. The two protective plates 16 are engaged with the corresponding reserved slots 15. The syringe 4 is placed into the storage compartment 3, and then the protective plate 16 is locked in the reserved slot 15 to fix the syringe 4 and prevent the syringe 4 from accidentally slipping out.

[0032] Specifically, before using the device, a certain amount of medication is first drawn using the front syringe 4, and saline solution is drawn using the rear syringe 4. Then, the syringes 4 are placed into the corresponding storage compartments 3, and the three-way connector 9 is connected to both syringes 4. The front pusher 6 is activated, pushing the piston rod 5 to the right to squeeze the medication in the front syringe 4. The medication flows through the three-way connector 9 into the tubing 10, and then is injected into the body through the needle 11. After the front piston rod 5 has squeezed all the medication out of the front syringe 4, the positioning block 7 touches the touch switch 8, at which point the rear pusher 6 is activated. The device moves by pushing the rear actuator 6, which in turn moves the rear piston rod 5 to squeeze the rear syringe 4, opening the syringe. The saline solution in the rear syringe 4 is squeezed by the rear piston rod 5 and flows into the tubing 10 through the three-way tube 9, squeezing out the remaining medication in the tubing 10. As the rear actuator 6 continues to squeeze the piston rod 5, the saline solution in the rear syringe 4 continues to flow into the needle 11, thus completely injecting the medication into the body. Of course, the switching between the two actuators can also be achieved through a built-in program electronic control, which can achieve the purpose of this application. The device can be secured to clothing by the clamp 13, making it convenient to use and preventing problems such as tube pulling caused by the patient's body movement during use. The clamp 13 is connected by screws 14, which makes it easy to disassemble. The protective plate 16 engages with the reserved slot 15 to fix the syringe 4 and prevent the syringe 4 from moving in the storage compartment 3.

[0033] Reference Figure 2 and Figure 5 The quick-installation mechanism 2 includes two retaining seats 201, which are fixedly connected to both ends of the adjusting belt 12. When the adjusting belt 12 is to be installed, the retaining seats 201 are inserted into the slots 202 on the bottom of the pump housing 1, thus starting the installation process. Slots 202 are provided around the bottom of the pump housing 1, and multiple retaining seats 201 engage with their corresponding slots 202. Pre-drilled holes 203 are provided on the opposite sides of the retaining seats 201, providing space for the installation and movement of the retaining blocks 204. Retaining blocks 204 are slidably connected to the inner walls of the multiple pre-drilled holes 203. Pre-drilled slots 202 are provided on adjacent sides of the multiple slots 202. 5. Multiple locking blocks 204 are engaged with corresponding reserved slots 205. The locking blocks 204 are engaged in the reserved slots 205 to a certain extent to prevent the card holder 201 from accidentally coming out of the slot 202, which increases the reliability of the connection. A spring 206 is fixedly connected to each adjacent side of the multiple locking blocks 204. The spring 206 provides elastic force to the locking blocks 204. The other end of the multiple springs 206 is fixedly connected to the reserved hole 203. A lever 207 is fixedly connected to the front side of the outer wall of the multiple locking blocks 204. When it is necessary to remove the adjustment belt 12, the lever 207 is moved to make the locking blocks 204 disengage from the reserved slots 205, thereby removing the card holder 201 from the slot 202.

[0034] Specifically, when the adjusting belt 12 is to be installed onto the pump housing 1 via the quick-release mechanism 2, first align the retaining seats 201 at both ends of the adjusting belt 12 with the retaining grooves 202 opened around the bottom of the pump housing 1. Then, apply a certain external force to push the retaining seats 201 toward the retaining grooves 202. As the retaining seats 201 are pushed toward the retaining grooves 202, the inner wall of the retaining grooves 202 will squeeze the retaining blocks 204, causing the retaining blocks 204 to overcome the elastic force of the spring 206 and retract into the pre-drilled holes 203. When the retaining seats 201 are fully pushed into the appropriate position in the retaining grooves 202, the retaining blocks 204 just... Align the pre-reserved slot 205 on the adjacent side of the card slot 202. At this time, the card block 204 pops out under the elastic force of the spring 206 and is inserted into the pre-reserved slot 205, realizing the stable engagement of the card seat 201 and the card slot 202, thereby firmly installing the adjustment belt 12 on the pump housing 1. When disassembly is required, push the middle wall of the device with the paddle 207, thereby driving the card block 204 to squeeze the spring 206, so that the card block 204 is disengaged from the pre-reserved slot 205, realizing the separation of the card seat 201 and the card slot 202, thereby quickly disassembling the adjustment belt 12.

[0035] Reference Figure 1 , Figure 3 and Figure 5 A battery slot 17 is provided on the front side of the outer wall of the pump housing 1. The battery slot 17 is used to place the battery and provide power to the device to ensure that all components can work normally. A protective cover 18 is rotatably connected to the front side of the outer wall of the pump housing 1. A screw 19 is threadedly connected to the right side of the outer wall of the protective cover 18. The protective cover 18 is threaded to the pump housing 1 through the screw 19. The protective cover 18 is installed on the front side of the outer wall of the pump housing 1, covering the battery slot 17, and plays a role in protecting the battery in the battery slot 17, preventing external dust from affecting the battery and the stability of the connection between the battery and the internal circuit. A control board 20 is fixedly connected to the top center of the pump housing 1. A display 21 is fixedly connected to the inner wall of the control board 20. The control board 20 serves as the control center of the entire injection pump and can regulate the operation of each component. The display 21 can intuitively display relevant working parameter information.

[0036] Specifically, the battery compartment 17 is used to hold a spare battery to provide additional power to the device, ensuring that all components can work normally. The protective cover 18 is installed on the front side of the outer wall of the pump housing 1, covering the battery compartment 17, and serves to protect the battery inside the battery compartment 17, preventing external dust from affecting the battery and the stability of the connection between the battery and the internal circuit. The control board 20 serves as the control center of the entire injection pump, which can regulate the operation of each component. The display 21 can intuitively display relevant operating parameter information.

[0037] Reference Figure 1 , Figure 2 and Figure 4A mounting base 22 is fixedly connected to the top right side of the pump casing 1. An alarm light 23 is fixedly connected to the inner wall of the mounting base 22. The mounting base 22 provides a stable mounting support for the alarm light 23. When the device malfunctions, the alarm light 23 flashes to remind the user. Multiple power lights 24 are fixedly connected to the top front side of the outer wall of the control panel 20. The multiple power lights 24 are electrically connected to the battery slot 17. The power lights 24 can obtain the battery power data in real time, and the user can accurately know the remaining power of the device through the power lights 24.

[0038] Specifically, the mounting base 22 provides a stable mounting support for the alarm light 23. When the device malfunctions, the alarm light 23 flashes to alert the user. The power indicator 24 can obtain the battery power data in real time, and the user can accurately know the remaining power of the device through the power indicator 24.

[0039] Working principle: Before using the device, first use the front syringe 4 to draw a certain amount of medication and the rear syringe 4 to draw saline solution. Then, place the syringes 4 into the corresponding storage compartments 3, connect the three-way connector 9 to the two syringes 4, and activate the front pusher 6 to push the piston rod 5 to squeeze the medication in the front syringe 4. The medication flows through the three-way connector 9 into the tubing 10, and then through the needle 11 to be injected into the human body. After the front piston rod 5 has squeezed out all the medication in the front syringe 4, the positioning block 7 just touches the... Touching switch 8 activates the rear pusher 6, which moves the rear piston rod 5 to squeeze the rear syringe 4. The electric regulating valve 25 opens, and the saline solution in the rear syringe 4 flows into the tubing 10 through the three-way tube 9 after being squeezed by the rear piston rod 5. The remaining medicine in the tubing 10 is squeezed. As the rear pusher 6 continues to squeeze the piston rod 5, the saline solution in the rear syringe 4 continues to flow into the needle 11, thus completely injecting the medicine in the needle 11 into the human body.

[0040] Furthermore, by aligning the retainers 201 at both ends of the adjusting belt 12 with the slots 202 opened around the bottom of the pump housing 1, and then applying a certain external force, the retainers 201 are pushed towards the slots 202. The inner wall of the slots 202 will squeeze the retaining block 204, causing the retaining block 204 to overcome the elastic force of the spring 206 and retract into the reserved hole 203. When the retainer 201 is fully pushed into the appropriate position in the slots 202, the retaining block 204 is just aligned with the reserved slot 202 on the adjacent side of the slots 202. 5. At this time, the locking block 204 pops out under the elastic force of the spring 206 and locks into the reserved slot 205, realizing the stable engagement of the locking seat 201 and the slot 202, thereby firmly installing the adjusting belt 12 on the pump housing 1. When disassembly is required, the lever 207 is pushed towards the middle of the device, thereby driving the locking block 204 to squeeze the spring 206, causing the locking block 204 to disengage from the reserved slot 205, realizing the separation of the locking seat 201 and the slot 202, thereby quickly disassembling the adjusting belt 12.

[0041] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A portable micro-injection pump for subcutaneous drug delivery, comprising a pump housing (1), characterized in that: The pump housing (1) has storage compartments (3) on both the front and back sides of its inner wall. The inner walls of the two storage compartments (3) are slidably connected to syringes (4). The left side of the inner walls of the two syringes (4) is slidably connected to piston rods (5). The front and back sides of the left end of the inner wall of the pump housing (1) are fixedly connected to pushers (6). The right ends of the two syringes (4) are connected to a three-way tube (9). The middle of the outer wall of the three-way tube (9) is fixedly connected to an electric regulating valve (25). The other end of the three-way tube (9) is connected to a flexible tube (10). The other end of the flexible tube (10) is fixedly connected to a needle (11).

2. A portable micro-infusion pump for subcutaneous drug delivery according to claim 1, characterized in that: A positioning block (7) is fixedly connected to the bottom of the outer wall of the piston rod (5), and a tactile switch (8) is fixedly connected to the bottom of the inner wall of the storage compartment (3) on the front side.

3. A portable micro-infusion pump for subcutaneous drug delivery according to claim 1, characterized in that: The bottom left and right sides of the pump casing (1) are provided with adjustment belts (12), and the right ends of the two adjustment belts (12) are provided with quick-release mechanisms (2).

4. A portable micro-infusion pump for subcutaneous drug delivery according to claim 3, characterized in that: Multiple quick-connect mechanisms (2) are used to connect the pump housing (1) and the adjusting belt (12). Each quick-connect mechanism (2) includes two retaining seats (201), which are fixedly connected to both ends of the adjusting belt (12). The bottom of the pump housing (1) is provided with slots (202) around its perimeter. Multiple retaining seats (201) engage with their corresponding slots (202). Each retaining seat (201) has a pre-drilled hole (203) on its opposite side. The inner wall of each of the multiple slots (203) is slidably connected with a locking block (204). Each of the multiple slots (202) has a reserved slot two (205) on an adjacent side. Each of the multiple locking blocks (204) engages with the corresponding reserved slot two (205). Each of the multiple locking blocks (204) has a spring (206) fixedly connected to an adjacent side. The other end of each of the multiple springs (206) is fixedly connected to the reserved hole (203). Each of the multiple locking blocks (204) has a paddle (207) fixedly connected to the front side of the outer wall.

5. A portable micro-infusion pump for subcutaneous drug delivery according to claim 1, characterized in that: The bottom of the pump housing (1) is provided with a clamping plate (13), and the outer wall of the clamping plate (13) is threaded with a plurality of screws (14). The clamping plate (13) is threadedly connected to the pump housing (1) through the screws (14).

6. A portable micro-infusion pump for subcutaneous drug delivery according to claim 1, characterized in that: Both storage compartments (3) have a reserved slot (15) on the right side of their inner walls. Both reserved slots (15) have protective plates (16) on their inner walls. Both protective plates (16) are engaged with the corresponding reserved slots (15).

7. A portable micro-infusion pump for subcutaneous drug delivery according to claim 1, characterized in that: A battery slot (17) is provided on the front side of the outer wall of the pump housing (1). A protective cover (18) is rotatably connected to the front side of the outer wall of the pump housing (1). A screw (19) is threadedly connected to the right side of the outer wall of the protective cover (18). The protective cover (18) is threadedly connected to the pump housing (1) through the screw (19).

8. A portable micro-infusion pump for subcutaneous drug delivery according to claim 7, characterized in that: A control board (20) is fixedly connected to the top center of the pump casing (1), and a display (21) is fixedly connected to the inner wall of the control board (20).

9. A portable micro-infusion pump for subcutaneous drug delivery according to claim 1, characterized in that: A mounting base (22) is fixedly connected to the top right side of the pump casing (1), and an alarm light (23) is fixedly connected to the inner wall of the mounting base (22).

10. A portable micro-infusion pump for subcutaneous drug delivery according to claim 8, characterized in that: Multiple power lamps (24) are fixedly connected to the top front side of the outer wall of the control board (20), and the multiple power lamps (24) are electrically connected to the battery compartment (17) respectively.

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