SMD (Surface Mount Device) pump

Abstract

The utility model discloses a patch pump, and particularly relates to the technical field of medicine delivery, the patch pump comprises a double faced adhesive tape, one side of the double faced adhesive tape is fixedly connected with an upper cover, a medicine bag assembly is clamped between the upper cover and the double faced adhesive tape, one end of the medicine bag assembly is communicated with a medicine inlet valve, and the other end of the medicine inlet valve is communicated with a needle inlet assembly linked with the medicine bag assembly; liquid medicine is stored in the medicine bag assembly in a pressure mode, the needle inserting assembly adjusts the sectional area of a flow channel of the liquid medicine according to the medicine feeding pressure change of the medicine bag assembly, the medicine feeding flow of the liquid medicine passing through the needle inserting assembly is stable, the patch pump provides injection power through the elastic medicine bag, an additional power device is not needed, and the patch pump is simple and compact in structure, light in weight and convenient to use. The automatic adjusting device can adjust the sectional area of the flow channel according to the injection pressure of the elastic medicine bag, and it is ensured that the medicine injection rate is relatively stable.

Description

Technical Field

[0001] This utility model belongs to the field of drug delivery technology, specifically relating to a patch pump. Background Technology

[0002] Subcutaneous drug injections typically use a standard syringe for slow administration. However, with advancements in medical technology, the dosage of subcutaneous drugs can be increased to a maximum of 25 ml, making standard syringes insufficient. Patch pumps are an advanced subcutaneous drug delivery device suitable for high-dose subcutaneous injections.

[0003] Patch pumps are commonly used for continuous insulin infusion in diabetic patients and can also be used to deliver other types of medications. Patch pumps are designed to be directly attached to the skin, injecting medication directly into the subcutaneous tissue through a thin catheter, and require a power source to drive the drug injection system. For example, an existing sterile patch pump (publication number CN107847666B) uses a hydrogen generator in a pressurization system for power, and the hydrogen generator is equipped with corresponding control devices. Existing patch pumps typically require a power source and corresponding control devices. As the dosage of subcutaneously injected drugs increases, the overall weight of the patch pump becomes significant, making it inconvenient to attach to the skin surface for injection. Therefore, a new type of patch pump is needed. Utility Model Content

[0004] To address the aforementioned problems, this utility model discloses a patch pump.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] A patch pump includes double-sided adhesive tape, with a top cover fixedly connected to one side of the double-sided adhesive tape. A drug capsule assembly is sandwiched between the top cover and the double-sided adhesive tape. One end of the drug capsule assembly is connected to a drug inlet valve, and the other end of the drug inlet valve is connected to a needle insertion assembly that is linked to the drug capsule assembly. The drug capsule assembly stores liquid medication under pressure. The needle insertion assembly adjusts the cross-sectional area of ​​the liquid medication flow channel according to the drug administration pressure change of the drug capsule assembly, and the drug administration flow rate through the needle insertion assembly is stable.

[0007] As a preferred embodiment of this utility model, the drug capsule assembly includes: a lower outer shell and an upper outer shell of the drug capsule assembled together. A central tube of the drug capsule is placed in the storage cavity formed between the lower outer shell and the upper outer shell. One end of the central tube is connected to the drug inlet valve through a flexible tube. An elastic drug capsule is elastically wrapped around the outer wall of the central tube, and both ends of the elastic drug capsule are sealed and fixed to the outer wall of the central tube. The inner cavity of the central tube and the elastic drug capsule are connected through several evenly distributed through holes on the central tube. A flow regulating push rod is slidably connected to both the lower outer shell and the upper outer shell of the drug capsule.

[0008] As a preferred embodiment of this utility model, each end of the elastic sac is elastically fitted with a sac fixing ring, and both sac fixing rings are attached to the inner walls of the lower sac shell and the upper sac shell.

[0009] As a preferred technical solution of this utility model, the outer shell of the medicine bag is made of transparent material, and the top cover has a through hole that exposes the outer shell of the medicine bag.

[0010] As a preferred embodiment of this utility model, the needle insertion assembly includes: an annular needle inserter housing that is snapped into the through hole of the flat plate of the lower outer shell of the drug capsule; a liquid circuit adapter is slidably connected to the inner wall of the needle inserter housing at the upper and lower limits; a sealing plug is embedded in the top opening of the liquid circuit adapter, and an inlet needle is inserted into the sealing plug; a soft needle extends from the bottom through hole of the liquid circuit adapter; the inlet needle is slidably inserted into the center hole of the soft needle; the transverse branch of the liquid circuit adapter is connected to the drug injection valve through a flexible tube; and an adjusting valve core coaxial with the transverse branch of the liquid circuit adapter is slidably connected to the liquid circuit adapter; the conical head of the adjusting valve core is inserted into the transverse branch of the liquid circuit adapter; the adjusting valve core is always in close contact with the flow regulating push rod; and a spring that is always in a compressed state is sleeved on the extension tube of the liquid circuit adapter, with the other end of the spring abutting against the side plate of the adjusting valve core.

[0011] As a preferred technical solution of this utility model, the annular wall of the needle inserter housing extends with at least two elastic extension pieces. The initial slots of all the elastic extension pieces engage with the bottom extension ring of the fluid circuit adapter. The initial slots are provided with chamfers to adapt to guide the fluid circuit adapter to move downward, and the bottom extension ring of the fluid circuit adapter is locked when it moves below the elastic extension pieces.

[0012] As a preferred embodiment of this utility model, the top of the fluid circuit adapter is fitted with a pin ring, the top of the pin ring is fitted with a pin inserter handle, and the pin inserter handle is fixedly connected to the guide pin.

[0013] As a preferred technical solution of this utility model, the guide needle slides through a safety protection block, and the safety protection block is fixedly inserted into the notch at the top of the liquid circuit adapter. The top of the safety protection block elastically clamps the guide needle, and the guide needle has a notch adapted to the elastic clamping of the safety protection block.

[0014] As a preferred embodiment of this utility model, the regulating valve core is provided with a notch adapted to the inlet needle, and a sealing ring is sleeved in the middle of the regulating valve core, and the sealing ring is in contact with the inner wall of the extension tube of the liquid circuit adapter.

[0015] As a preferred technical solution of this utility model, the bottom of the drug inlet valve is snapped into the through hole of the flat plate of the lower outer shell of the drug bag, and a drug inlet plug is embedded at the bottom opening of the drug inlet valve, and the double-sided adhesive has a through hole for exposing the drug inlet plug.

[0016] The beneficial effects of this utility model are as follows:

[0017] 1. This patch pump provides injection power through an elastic drug capsule, eliminating the need for an additional power unit. It features a simple and compact structure and is lightweight. The automatic adjustment device can adjust the flow channel cross-sectional area according to the injection pressure of the elastic drug capsule, ensuring a relatively stable drug injection rate and achieving a relatively stable and slow subcutaneous injection.

[0018] 2. Some patch pumps require silicone oil to be applied between the piston and the cartridge for lubrication when storing the drug solution. Silicone oil can affect the drug performance to some extent. The patch pump of this application uses an elastic drug capsule as the drug storage chamber and does not require silicone oil lubrication.

[0019] Third, the guide needle of the patch pump is equipped with a safety device. After the guide needle is pulled out, the safety device can ensure that the needle tip is not exposed, reducing the probability of needle puncture injury to the human body. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0021] Figure 2 This is a schematic diagram of the overall structure from another angle of an embodiment of the present invention;

[0022] Figure 3 This is an exploded view of the overall embodiment of this utility model;

[0023] Figure 4 This is an exploded view of the needle insertion assembly, drug inlet valve, drug capsule assembly, and tubing according to an embodiment of the present invention;

[0024] Figure 5 This is a cross-sectional view of the central tube and elastic drug capsule of an embodiment of the present invention;

[0025] Figure 6 This is a cross-sectional view of the needle insertion assembly according to an embodiment of the present invention;

[0026] Figure 7 This is a schematic diagram of the structure of the guide needle and the safety protection block in an embodiment of the present invention;

[0027] Figure 8 This is a partial cross-sectional view of the pin inserter housing and the fluid circuit adapter according to an embodiment of the present invention;

[0028] Figure 9 This is a schematic diagram of the structure of the pin inserter housing according to an embodiment of the present invention;

[0029] Figure 10 This is a schematic diagram of the structure of the drug inlet valve in an embodiment of this utility model.

[0030] List of identifiers in attached diagrams:

[0031] 1. Top cover;

[0032] 2. Needle insertion assembly; 201. Needle inserter housing; 201a. Elastic extension sheet; 201b. Initial slot; 202. Needle inserter ring; 203. Needle inserter handle; 204. Insertion needle; 205. Safety protection block; 206. Fluid circuit adapter; 207. Sealing plug; 208. Soft needle; 209. Adjusting valve core; 210. Sealing ring; 211. Spring;

[0033] 3. Inlet valve; 301. Inlet rubber stopper;

[0034] 4. Drug capsule assembly; 401. Lower outer shell of drug capsule; 402. Upper outer shell of drug capsule; 403. Drug capsule retaining ring; 404. Central tube of drug capsule; 405. Elastic drug capsule; 406. Flow regulating push rod;

[0035] 5. Double-sided tape;

[0036] 6. Hose. Detailed Implementation

[0037] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0038] Please see Figure 1-10 A patch pump includes double-sided adhesive tape 5, with a top cover 1 fixedly connected to one side of the tape 5. The double-sided adhesive tape 5 secures the patch pump to human skin, while the top cover 1 provides dust protection and aesthetic appeal. A drug capsule assembly 4 is sandwiched between the top cover 1 and the double-sided adhesive tape 5. One end of the drug capsule assembly 4 is connected to a drug inlet valve 3, and the other end of the drug inlet valve 3 is connected to a needle insertion assembly 2 that is linked to the drug capsule assembly 4. The drug capsule assembly 4 stores medication under pressure. The needle insertion assembly 2 adjusts the cross-sectional area of ​​the medication flow channel according to changes in the medication pressure of the drug capsule assembly 4, ensuring a stable medication flow rate. The needle insertion assembly 2 is used to insert an injection needle into the human body, establishing a pathway between the elastic drug capsule 405 and the subcutaneous tissue. The drug capsule assembly 4 stores medication and provides injection power. The needle insertion assembly 2 is located at the center of the drug capsule assembly 4.

[0039] The drug capsule assembly 4 includes a lower outer shell 401 and an upper outer shell 402 assembled together. A central tube 404 is placed within the storage cavity formed by the lower outer shell 401 and the upper outer shell 402, and one end of the central tube 404 is connected to the drug inlet valve 3 via a flexible tube 6. An elastic drug capsule 405 is elastically wrapped around the outer wall of the central tube 404, and both ends of the elastic drug capsule 405 are sealed and fixed to the outer wall of the central tube 404. The inner cavity of the central tube 404 and the elastic drug capsule 405 are connected through several evenly distributed through holes on the central tube 404. The lower outer shell 401 and the upper outer shell 402 together form a storage cavity, restricting the expansion shape of the elastic drug capsule 405. The central tube 404 of the drug capsule supports the elastic drug capsule 405. The drug solution enters the elastic drug capsule 405 from the drug inlet valve 3 through the central tube 404, causing the elastic drug capsule 405 to expand and store the drug solution. During the injection process, the drug solution can return from the elastic drug capsule 405 to the inner cavity of the drug inlet valve 3 and enter the needle insertion assembly 2 through another branch tube of the drug inlet valve 3. Finally, the drug solution is injected into the human body through the needle insertion assembly 2.

[0040] The lower outer shell 401 and the upper outer shell 402 of the drug capsule are laterally slidably connected by a flow regulating push rod 406. The flow regulating push rod 406 is always in close contact with the elastic drug capsule 405. After the elastic drug capsule 405 is filled with medicine, it expands and pushes the flow regulating push rod 406 to move, driving the regulating valve core 209 to regulate the flow rate. Under the push of the spring 211, the regulating valve core 209 and the flow regulating push rod 406 are kept in close contact, further ensuring that the flow regulating push rod 406 is in close contact with the elastic drug capsule 405.

[0041] The elastic capsule 405 can be configured with several capacities, such as 5ml, 10ml, and 25ml. Its functions include storing medication and providing the power source for injection (through the elasticity of the elastomer). The elastic capsule 405 can be various shapes; in this embodiment, it is annular and surrounds the needle insertion assembly 2. A medication inlet valve 3 is located at the notch of the elastic capsule 405. During assembly, the central tube 404 expands the inner wall of the elastic capsule 405, creating a pre-tightening force. This pre-tightening force ensures a tight fit between the elastic capsule 405 and the central tube 404, reducing the amount of residual medication in the capsule. Injection times vary depending on the medication capacity, generally ranging from 5 to 45 minutes. Different injection times can be achieved by selecting elastic capsules made of materials and thicknesses with varying elasticity.

[0042] Each end of the elastic sac 405 is elastically fitted with a sac fixing ring 403, and both sac fixing rings 403 are in contact with the inner walls of the lower outer shell 401 and the upper outer shell 402 of the sac. In this embodiment, the two sac fixing rings 403 press and fix the two ends of the elastic sac 405 and the central tube 404 of the sac to form a seal. The sealing and fixing can also be done by other methods, such as by adhesive bonding or by fixing with straps.

[0043] The outer shell 402 of the medicine capsule is made of transparent material, and the top cover 1 has a through hole that exposes the outer shell 402 of the medicine capsule, allowing the user to see the filling status (empty / full) of the medicine inside the elastic medicine capsule 405.

[0044] The needle insertion assembly 2 includes an annular needle inserter housing 201 that snaps into the through-hole of the lower outer shell 401 of the drug capsule. A fluid path adapter 206 is slidably connected to the inner wall of the needle inserter housing 201 at its upper and lower limits. The fluid path adapter 206 is in its initial position when slid to its top and in its injection position when slid to its bottom. A sealing plug 207 is embedded in the top opening of the fluid path adapter 206, and an insertion needle 204 is inserted into the sealing plug 207. When the sealing plug 207 is removed from the insertion needle 204, the channel left by the insertion needle 204 is closed. A soft needle 208 extends from the bottom through-hole of the fluid path adapter 206, and the insertion needle 204 slides into the central hole of the soft needle 208. When the soft needle 208 is inserted into the insertion needle 204, the channel between the inner cavity of the fluid path adapter 206 and the subcutaneous tissue is closed. The transverse branch of the fluid flow adapter 206 is connected to the inlet valve 3 via a flexible hose 6, and a regulating valve core 209, coaxial with the transverse branch, is slidably connected to the fluid flow adapter 206. The conical head of the regulating valve core 209 is inserted into the transverse branch of the fluid flow adapter 206, and the regulating valve core 209 is always in close contact with the flow regulating push rod 406. As the regulating valve core 209 moves, the degree to which its conical head is inserted into the transverse branch of the fluid flow adapter 206 changes, thereby changing the cross-sectional area of ​​the flow channel within the transverse branch. The extension tube of the fluid flow adapter 206 is sleeved with a spring 211 that is always in a compressed state, and the other end of the spring 211 abuts against the side plate of the regulating valve core 209.

[0045] The conical head design of the regulating valve core 209 (other similar cross-sectional area gradient designs are also acceptable) regulates the flow rate of the medicine entering the human body per unit time under the movement of the flow regulating push rod 406.

[0046] The annular wall of the needle inserter housing 201 extends with at least two elastic extension tabs 201a, and the initial slots 201b of all elastic extension tabs 201a engage with the bottom extension ring of the fluid circuit adapter 206. The initial slots 201b are provided with a chamfer to adapt to guide the downward movement of the fluid circuit adapter 206, and are engaged when the bottom extension ring of the fluid circuit adapter 206 moves below the elastic extension tabs 201a. When the initial slots 201b engage the bottom extension ring of the fluid circuit adapter 206, the fluid circuit adapter 206 is in the initial position; when the bottom extension ring of the fluid circuit adapter 206 moves below the elastic extension tabs 201a, the fluid circuit adapter 206 is in the injection position.

[0047] The top of the fluid circuit adapter 206 is fitted with a pin ring 202, and the top of the pin ring 202 is fitted with a needle inserter handle 203, which is fixedly connected to the insertion needle 204. The fixation between the pin ring 202 and the fluid circuit adapter 206 is quite tight and difficult to pull apart easily, while the connection between the pin ring 202 and the needle inserter handle 203 can be easily pulled apart with a certain amount of pulling force. The needle inserter handle 203 and the insertion needle 204 are fixed by an interference fit or adhesive. Pressing the needle inserter handle 203 moves the insertion needle 204 downward, causing the soft needle 208 to be inserted into the human body. After the soft needle 208 is in place, the needle inserter handle 203 is pulled out, along with the insertion needle 204 and the safety protection block 205.

[0048] The guide pin 204 slides through the safety protection block 205, and the safety protection block 205 is fixedly engaged in the notch at the top of the fluid circuit adapter 206. The top of the safety protection block 205 elastically clamps the guide pin 204, and the guide pin 204 has a notch adapted to the elastic clamping of the safety protection block 205. The safety protection block 205 is fixed on the fluid circuit adapter 206, and the safety protection block 205 is designed with two elastic extension pieces. The fluid circuit adapter 206 has notches corresponding to the extension pieces. The two elastic extension pieces are compressed by the notches to fix the safety protection block 205. A certain external force can pull the safety protection block 205 out of the notch of the fluid circuit adapter 206. In actual use, the guide needle 204 has a notch, and the top slit of the safety protection block 205 elastically slides and clamps the guide needle 204. When the guide needle 204 is pulled out, the guide needle 204 moves relative to the safety protection block 205. When it moves to a certain position, the notch of the guide needle 204 is locked by the elastic latch of the safety protection block 205, and the guide needle 204 cannot slide. The needle tip is fixed in the protective cavity of the safety protection block 205, so that the finger and any part of the human body will not touch the needle tip, thus avoiding injury to the human body.

[0049] The regulating valve core 209 is provided with a notch adapted to the inlet needle 204. A sealing ring 210 is sleeved in the middle of the regulating valve core 209, and the sealing ring 210 fits against the inner wall of the extension tube of the liquid circuit adapter 206 to enhance the sealing of the inner cavity of the liquid circuit adapter 206.

[0050] The bottom of the drug inlet valve 3 is engaged in the through hole of the flat plate of the lower outer shell 401 of the drug capsule, and a drug inlet plug 301 is embedded in the bottom opening of the drug inlet valve 3. The double-sided adhesive tape 5 has a through hole that exposes the drug inlet plug 301. The drug inlet plug 301 is used for the needle to puncture and inject the drug solution, and it closes the channel left by the needle after the needle is withdrawn.

[0051] Working principle

[0052] Before using the patch pump, fill the syringe with the drug solution, pierce the drug inlet stopper 301 of the drug inlet valve 3 with the syringe, and inject the drug solution into the drug inlet valve 3. After that, the drug solution enters the elastic drug capsule 405 through the connected drug capsule central tube 404. The elastic drug capsule 405 expands under the action of drug solution pressure to store the drug solution, and the lower outer shell 401 and the upper outer shell 402 of the drug capsule restrict the shape of the elastic drug capsule 405.

[0053] When using this patch pump, first peel off the double-sided adhesive 5 covering layer, then apply the patch pump to the skin (usually the abdomen or thigh), press the needle inserter handle 203, at this time the soft needle 208 is driven by the guide needle 204 to pierce the subcutaneous tissue, then pull out the needle inserter handle 203, the needle inserter handle 203 brings out the guide needle 204, creating a channel between the inner cavity of the fluid circuit adapter 206 and the subcutaneous tissue of the human body, the medicine is slowly injected into the subcutaneous tissue under the pressure of the elastic drug capsule 405;

[0054] Because the regulating valve core 209 is always in close contact with the flow regulating push rod 406, during the injection process, the injection pressure of the elastic capsule 405 is at its maximum initially, and the conical head of the regulating valve core 209 is inserted to the deepest depth into the transverse branch of the liquid circuit adapter 206. At this time, the cross-sectional area of ​​the flow channel in the transverse branch is the smallest. As the injection progresses, the elastic capsule 405 contracts, and the injection pressure gradually decreases. The regulating valve core 209 moves with the flow regulating push rod 406, and the depth of the conical head of the regulating valve core 209 inserted into the transverse branch of the liquid circuit adapter 206 decreases. The cross-sectional area of ​​the flow channel in the transverse branch gradually increases, making the amount of liquid injected per unit time relatively stable, and ensuring that the injection rate of the liquid is relatively stable throughout the entire injection process.

[0055] It should be noted that the above content merely illustrates the technical concept of this utility model and cannot be used to limit the scope of protection of this utility model. For those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and all such improvements and modifications fall within the scope of protection of the claims of this utility model.

Claims

1. A patch pump, comprising double-sided adhesive (5), characterized in that, A top cover (1) is fixedly connected to one side of the double-sided tape (5). A drug capsule assembly (4) is sandwiched between the top cover (1) and the double-sided tape (5). One end of the drug capsule assembly (4) is connected to a drug inlet valve (3), and the other end of the drug inlet valve (3) is connected to a needle insertion assembly (2) that is linked to the drug capsule assembly (4). The drug capsule assembly (4) stores liquid medicine under pressure. The needle insertion assembly (2) adjusts the cross-sectional area of ​​the liquid medicine flow channel according to the change of the drug administration pressure of the drug capsule assembly (4), and the drug administration flow rate through the needle insertion assembly (2) is stable.

2. A patch pump according to claim 1, characterized in that, The drug capsule assembly (4) includes: a lower outer shell (401) and an upper outer shell (402) of the drug capsule assembled together. A central tube (404) of the drug capsule is placed in the storage cavity formed between the lower outer shell (401) and the upper outer shell (402). One end of the central tube (404) is connected to the drug inlet valve (3) through a hose (6). An elastic drug capsule (405) is elastically wrapped around the outer wall of the central tube (404). Both ends of the elastic drug capsule (405) are sealed and fixed to the outer wall of the central tube (404). The inner cavity of the central tube (404) and the elastic drug capsule (405) are connected through several evenly distributed through holes on the central tube (404). The lower outer shell (401) and the upper outer shell (402) of the drug capsule are slidably connected to a flow regulating push rod (406).

3. A patch pump according to claim 2, characterized in that, The elastic sac (405) has a sac fixing ring (403) elastically fitted at both ends, and both sac fixing rings (403) are attached to the inner walls of the lower sac shell (401) and the upper sac shell (402).

4. A patch pump according to claim 2, characterized in that, The outer shell (402) of the medicine capsule is made of transparent material, and the cover (1) has a through hole that exposes the outer shell (402) of the medicine capsule.

5. A patch pump according to claim 2, characterized in that, The needle insertion assembly (2) includes: an annular needle inserter housing (201) snapped into the through hole of the flat plate of the lower housing (401) of the drug capsule; a fluid circuit adapter (206) is slidably connected to the inner wall of the needle inserter housing (201) with upper and lower limits; a sealing plug (207) is embedded in the top opening of the fluid circuit adapter (206), and an insert needle (204) is inserted into the sealing plug (207); a soft needle (208) extends from the through hole at the bottom of the fluid circuit adapter (206); the insert needle (204) is slidably inserted into the center hole of the soft needle (208); the fluid circuit adapter... The transverse branch pipe of (206) is connected to the drug inlet valve (3) through the hose (6), and the liquid circuit adapter (206) is slidably connected to the regulating valve core (209) coaxial with its transverse branch pipe. The conical head of the regulating valve core (209) is inserted into the transverse branch pipe of the liquid circuit adapter (206). The regulating valve core (209) is always in close contact with the flow regulating push rod (406). The extension pipe of the liquid circuit adapter (206) is covered with a spring (211) that is always in a compressed state, and the other end of the spring (211) abuts against the side plate of the regulating valve core (209).

6. A patch pump according to claim 5, characterized in that, The annular wall of the inserter housing (201) extends with at least two elastic extension pieces (201a). The initial slots (201b) of all the elastic extension pieces (201a) engage with the bottom extension ring of the fluid circuit adapter (206). The initial slots (201b) are provided with chamfers to adapt to guide the downward movement of the fluid circuit adapter (206), and the bottom extension ring of the fluid circuit adapter (206) is locked when it moves below the elastic extension pieces (201a).

7. A patch pump according to claim 5, characterized in that, The top of the fluid circuit adapter (206) is fitted with a pin ring (202), and the top of the pin ring (202) is fitted with a pin inserter handle (203), and the pin inserter handle (203) is fixedly connected to the guide pin (204).

8. A patch pump according to claim 7, characterized in that, The inlet needle (204) slides through the safety protection block (205), and the safety protection block (205) is fixedly inserted into the notch at the top of the liquid circuit adapter (206). The top of the safety protection block (205) elastically clamps the inlet needle (204), and the inlet needle (204) has a notch adapted to the elastic clamping of the safety protection block (205).

9. A patch pump according to claim 5, characterized in that, The regulating valve core (209) is provided with a notch for adapting to the inlet needle (204), and a sealing ring (210) is sleeved in the middle of the regulating valve core (209), and the sealing ring (210) fits against the inner wall of the extension tube of the liquid circuit adapter (206).

10. A patch pump according to claim 2, characterized in that, The bottom of the drug inlet valve (3) is engaged in the through hole of the flat plate of the lower outer shell (401) of the drug bag, and a drug inlet plug (301) is embedded in the bottom opening of the drug inlet valve (3). The double-sided adhesive (5) has a through hole that exposes the drug inlet plug (301).

Images