SMD (Surface Mount Device) pump

Abstract

The invention 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] The invention belongs to the technical field of drug delivery, and in particular relates to a patch pump. Background Art

[0002] Subcutaneous injection of drugs is generally done slowly with ordinary syringes. With the development of medical technology, the dosage of subcutaneous injection drugs is getting larger and larger, up to 25ml, and ordinary syringes can no longer meet the requirements. The patch pump is an advanced subcutaneous injection device that can be used for large-dose subcutaneous injections.

[0003] Patch pumps are usually used for continuous insulin infusion to treat diabetic patients, and can also be used to deliver other types of drugs. Patch pumps are designed to be directly attached to the skin, and the drug is directly injected into the subcutaneous tissue through a thin catheter, and a power source needs to be installed to drive the drug injection system. For example, the existing announcement number is: CN107847666B, a sterile patch pump, whose drug injection system is powered by a hydrogen generator in the booster system, and the hydrogen generator is equipped with a corresponding control device. Existing patch pumps are usually equipped with a power source and a corresponding control device. As the dose of subcutaneous injection drugs increases, the overall weight of the patch pump is relatively large, which is not convenient for affixing it to the skin surface for injection. Therefore, a new type of patch pump is needed. Summary of the invention

[0004] In order to solve the above problems, the present invention discloses a patch pump.

[0005] To achieve the above object, the technical solution of the present invention is as follows:

[0006] A patch pump comprises a double-sided adhesive tape, one side of which is fixedly connected to an upper cover, a medicine bag assembly is sandwiched between the upper cover and the double-sided adhesive tape, one end of the medicine bag assembly is connected to a medicine inlet valve, and the other end of the medicine inlet valve is connected to a needle insertion assembly linked to the medicine bag assembly; liquid medicine is pressure-stored in the medicine bag assembly, the needle insertion assembly adjusts the flow channel cross-sectional area of ​​the liquid medicine according to the drug administration pressure change of the medicine bag assembly, and the drug administration flow rate of the liquid medicine through the needle insertion assembly is stable.

[0007] As a preferred technical solution of the present invention, the medicine bag assembly includes: a medicine bag lower shell and a medicine bag upper shell that are assembled together, a medicine bag central tube is placed in the storage cavity formed between the medicine bag lower shell and the medicine bag upper shell, and one end of the medicine bag central tube is connected to the medicine inlet valve through a hose, the outer wall of the medicine bag central tube is elastically wrapped with an elastic medicine bag, and the two ends of the elastic medicine bag are sealed and fixed to the outer wall of the medicine bag central tube, the inner cavity of the medicine bag central tube is connected to the elastic medicine bag through a number of evenly distributed through holes on the medicine bag central tube, and the medicine bag lower shell and the medicine bag upper shell are jointly connected to a flow regulating push rod by transverse sliding.

[0008] As a preferred technical solution of the present invention, a medicine bag fixing ring is elastically sleeved on both ends of the elastic medicine bag, and the two medicine bag fixing rings are in contact with the inner walls of the lower outer shell of the medicine bag and the upper outer shell of the medicine bag.

[0009] As a preferred technical solution of the present invention, the upper shell of the medicine bag is made of a transparent material, and the upper cover is provided with a through hole exposing the upper shell of the medicine bag.

[0010] As a preferred technical solution of the present invention, the needle insertion assembly includes: an annular needle inserter shell that is clamped in the flat through hole of the lower shell of the medicine bag, the inner wall of the needle inserter shell is slidably connected with a liquid circuit adapter in the upper and lower limit positions, a sealing plug is inlaid at the top opening of the liquid circuit adapter, and an introduction needle is inserted into the sealing plug, a soft needle is extended from the bottom through hole of the liquid circuit adapter, and the introduction needle is slidably inserted into the center hole of the soft needle, the transverse branch of the liquid circuit adapter is connected to the medicine inlet valve through a hose, and the liquid circuit adapter is transversely slidably connected with a regulating valve core coaxial with its transverse branch, the conical head part of the regulating valve core is inserted into the transverse branch of the liquid circuit adapter, the regulating valve core is always close to the flow regulating push rod, and the extension tube sleeve of the liquid circuit adapter is covered with a spring that is always in a compressed state, and the other end of the spring is against the side plate of the regulating valve core.

[0011] As a preferred technical solution of the present invention, the annular wall of the needle inserter housing is extended with at least two elastic extension pieces, and the initial card grooves of all the elastic extension pieces jointly engage the bottom extension ring of the liquid circuit adapter, and the initial card groove is provided with a chamfer adapted to guide the liquid circuit adapter to move downward, and the bottom extension ring of the liquid circuit adapter is stuck when it moves below the elastic extension piece.

[0012] As a preferred technical solution of the present invention, a needle ring is clamped on the top of the liquid circuit adapter, a needle inserter handle is clamped on the top of the needle ring, and the needle inserter handle is fixedly connected to the introduction needle.

[0013] As a preferred technical solution of the present invention, the introduction 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 introduction needle, and the introduction needle is provided with a notch adapted to the elastic clamping of the safety protection block.

[0014] As a preferred technical solution of the present invention, the regulating valve core is provided with a notch adapted for the introduction needle, a sealing ring is sleeved in the middle of the regulating valve core, and the sealing ring fits against the inner wall of the extension tube of the liquid circuit adapter.

[0015] As a preferred technical solution of the present invention, the bottom of the medicine inlet valve is clamped in the through hole of the flat plate of the lower shell of the medicine bag, and a medicine inlet plug is embedded in the bottom opening of the medicine inlet valve, and the double-sided tape has a through hole exposing the medicine inlet plug.

[0016] The beneficial effects of the present invention are:

[0017] 1. The patch pump provides injection power through the elastic drug capsule, without the need for an additional power device, with a simple and compact structure and light weight. The automatic adjustment device can adjust the flow channel cross-sectional area according to the injection pressure of the elastic drug capsule to ensure a relatively stable injection rate of the drug, thereby achieving a relatively stable and slow subcutaneous injection;

[0018] Second, some patch pumps require silicone oil lubrication between the piston and the cartridge when storing liquid medicine. Silicone oil will affect the performance of the medicine to a certain extent. The patch pump of this application uses an elastic medicine bag as a medicine storage bin and does not require silicone oil lubrication;

[0019] 3. The guide needle of the patch pump is provided with a safety device. After the guide needle is pulled out, the safety device can ensure that the needle tip is not exposed to the outside, reducing the probability of the needle piercing the human body. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention;

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

[0022] Figure 3 It is an overall exploded view of an embodiment of the present invention;

[0023] Figure 4 An exploded view of the needle insertion assembly, the drug injection valve, the drug bag assembly and the hose according to an embodiment of the present invention;

[0024] Figure 5 It is a cross-sectional view of the central tube of the medicine bag and the elastic medicine bag in an embodiment of the present invention;

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

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

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

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

[0029] Fig.10 It is a schematic diagram of the structure of the medicine inlet valve according to an embodiment of the present invention.

[0030] List of Figure Symbols:

[0031] 1. Upper cover;

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

[0033] 3. Medicine inlet valve; 301. Medicine inlet rubber plug;

[0034] 4. Medicine capsule assembly; 401. Medicine capsule lower shell; 402. Medicine capsule upper shell; 403. Medicine capsule fixing ring; 404. Medicine capsule center tube; 405. Elastic medicine capsule; 406. Flow regulating push rod;

[0035] 5. Double-sided tape;

[0036] 6. Hose. DETAILED DESCRIPTION

[0037] The present invention will be further explained below in conjunction with 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 used to limit the scope of the present invention.

[0038] See also Figure 1-10 A patch pump comprises a double-sided adhesive tape 5, and an upper cover 1 is fixedly connected to one side of the double-sided adhesive tape 5. The double-sided adhesive tape 5 is used to fix the patch pump on the human skin, and the upper cover 1 is used to prevent dust and beautify the appearance. A medicine bag assembly 4 is sandwiched between the upper cover 1 and the double-sided adhesive tape 5, and one end of the medicine bag assembly 4 is connected to a medicine inlet valve 3, and the other end of the medicine inlet valve 3 is connected to a needle insertion assembly 2 linked to the medicine bag assembly 4. The medicine bag assembly 4 stores liquid medicine under pressure, and the needle insertion assembly 2 adjusts the flow channel cross-sectional area of ​​the liquid medicine according to the change of the drug administration pressure of the medicine bag assembly 4, and the drug administration flow rate of the liquid medicine through the needle insertion assembly 2 is stable. The needle insertion assembly 2 is used to insert the injection needle into the human body to construct a passage between the elastic medicine bag 405 and the subcutaneous tissue of the human body. The medicine bag assembly 4 is used to store medicine and provide injection power. The needle insertion assembly 2 is installed in the center of the medicine bag assembly 4.

[0039] The medicine bag assembly 4 includes: a medicine bag lower shell 401 and a medicine bag upper shell 402 which are assembled together, a medicine bag central tube 404 is placed in the storage cavity formed between the medicine bag lower shell 401 and the medicine bag upper shell 402, and one end of the medicine bag central tube 404 is connected to the medicine inlet valve 3 through a hose 6. An elastic medicine bag 405 is elastically wrapped on the outer wall of the medicine bag central tube 404, and both ends of the elastic medicine bag 405 are sealed and fixed to the outer wall of the medicine bag central tube 404, and the inner cavity of the medicine bag central tube 404 is connected to the elastic medicine bag 405 through a plurality of evenly distributed through holes on the medicine bag central tube 404. The medicine bag lower shell 401 and the medicine bag upper shell 402 together form a storage cavity to limit the expansion shape of the elastic medicine bag 405. The central tube 404 of the medicine bag supports the elastic medicine bag 405, and the medicine liquid enters the elastic medicine bag 405 from the medicine inlet valve 3 through the central tube 404 of the medicine bag, so that the elastic medicine bag 405 expands to store the medicine liquid. During the injection process, the medicine liquid can return from the elastic medicine bag 405 to the inner cavity of the medicine inlet valve 3, and enter the needle insertion assembly 2 through another branch tube of the medicine inlet valve 3. Finally, the medicine liquid is injected into the human body through the needle insertion assembly 2.

[0040] The lower shell 401 of the medicine bag and the upper shell 402 of the medicine bag are connected together in a transverse sliding manner with a flow regulating push rod 406. The flow regulating push rod 406 is always in close contact with the elastic medicine bag 405. After the elastic medicine bag 405 is filled with medicine, it expands, pushes the flow regulating push rod 406 to move, drives the regulating valve core 209 to adjust the flow size, and the regulating valve core 209 is pushed by the spring 211 to ensure that the regulating valve core 209 and the flow regulating push rod 406 are in close contact, and further ensure that the flow regulating push rod 406 is in close contact with the elastic medicine bag 405.

[0041] The capacity of the elastic medicine bag 405 can be set to several models, such as 5ml, 10ml, 25ml, etc. Its function one is the medicine storage function, and function two can provide a power source for injection (through the elasticity of the elastomer). The shape of the elastic medicine bag 405 can be set to various shapes. The elastic medicine bag 405 of the embodiment of the present application is annular, and the elastic medicine bag 405 surrounds the needle insertion component 2, and the medicine inlet valve 3 is set at the notch of the elastic medicine bag 405. The medicine bag central tube 404 props up the inner wall of the elastic medicine bag 405 during assembly, so that the elastic medicine bag 405 has a pre-tightening force, which ensures that the elastic medicine bag 405 and the medicine bag central tube 404 fit closely. The advantage of this design is to reduce the residual amount of liquid medicine in the elastic medicine bag 405. The injection time of liquid medicine of different capacities is different. The overall injection time is generally about 5-45 minutes. The requirements of different injection times can be achieved by selecting elastic materials and thicknesses with different elasticities to make elastic balloons.

[0042] A medicine bag fixing ring 403 is elastically sleeved on both ends of the elastic medicine bag 405, and the two medicine bag fixing rings 403 are both in contact with the inner walls of the medicine bag lower shell 401 and the medicine bag upper shell 402. In the embodiment of the present application, the two ends of the elastic medicine bag 405 and the medicine bag central tube 404 are pressed and fixed by the two medicine bag fixing rings 403 to form a seal, and the sealing and fixing can also be carried out in other ways, such as bonding by glue, fixing by a band, etc.

[0043] The medicine bag upper shell 402 is made of a transparent material, and the upper cover 1 is provided with a through hole to expose the medicine bag upper shell 402 , so that the user can see the filling status (empty / full) of the medicine in the elastic medicine bag 405 .

[0044] The needle insertion assembly 2 includes: an annular needle insertion device housing 201 that is clamped in the flat through hole of the lower shell 401 of the medicine bag. The inner wall of the needle insertion device housing 201 is slidably connected with a liquid circuit adapter 206 in the upper and lower limit positions, wherein the liquid circuit adapter 206 is in the initial position when it slides to the top, and is in the injection position when it slides to the bottom. A sealing plug 207 is inlaid at the top opening of the liquid circuit adapter 206, and an introduction needle 204 is inserted into the sealing plug 207. The sealing plug 207 pulls out the introduction needle 204, and the channel left by the introduction needle 204 is closed. A soft needle 208 extends from the bottom through hole of the liquid circuit adapter 206, and the introduction needle 204 is slidably inserted into the center hole of the soft needle 208. When the soft needle 208 is inserted into the introduction needle 204, the channel between the inner cavity of the liquid circuit adapter 206 and the subcutaneous tissue is closed. The transverse branch of the liquid circuit adapter 206 is connected to the drug inlet valve 3 through the hose 6, and the liquid circuit adapter 206 is laterally slidably connected with a regulating valve core 209 coaxial with its transverse branch. The conical head of the regulating valve core 209 is partially inserted into the transverse branch of the liquid circuit adapter 206, and the regulating valve core 209 is always close to 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 liquid circuit adapter 206 changes, so that the cross-sectional area of ​​the flow channel in the transverse branch changes. The extension tube 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 is 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) adjusts the flow rate of the liquid medicine entering the human body per unit time under the movement of the flow regulating push rod 406.

[0046] At least two elastic extension pieces 201a extend from the annular wall of the needle inserter housing 201, and the initial slots 201b of all the elastic extension pieces 201a are used to engage the bottom extension ring of the liquid circuit adapter 206. The initial slots 201b are provided with chamfers adapted to guide the liquid circuit adapter 206 to move downward, and the bottom extension ring of the liquid circuit adapter 206 is stuck when it moves below the elastic extension piece 201a. When the initial slots 201b engage the bottom extension ring of the liquid circuit adapter 206, the liquid circuit adapter 206 is in the initial position; when the bottom extension ring of the liquid circuit adapter 206 moves below the elastic extension piece 201a, the liquid circuit adapter 206 is in the injection position.

[0047] The top of the liquid circuit adapter 206 is clamped with the needle ring 202, and the top of the needle ring 202 is clamped with the needle inserter handle 203, and the needle inserter handle 203 is fixedly connected to the introduction needle 204. The fixation between the needle ring 202 and the liquid circuit adapter 206 is relatively tight and difficult to be easily pulled apart, and the connection between the needle ring 202 and the needle inserter handle 203 can be easily pulled apart by a certain amount of pulling force. The needle inserter handle 203 and the introduction needle 204 are fixed by an interference fit or an adhesive. Pressing the needle inserter handle 203, the introduction needle 204 moves downward, driving 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 together with the introduction needle 204 and the safety protection block 205.

[0048] The introduction 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 introduction needle 204, and the introduction needle 204 is provided with a notch adapted to the elastic clamping of the safety protection block 205. The safety protection block 205 is fixed on the liquid circuit adapter 206, wherein the safety protection block 205 is designed with two elastic extension pieces, and there is a notch on the liquid circuit adapter 206 corresponding to the extension piece. The two elastic extension pieces are compressed by the notch to fix the safety protection block 205, and a certain external force can pull the safety protection block 205 out of the notch of the liquid circuit adapter 206. During actual use, there is a notch on the introduction needle 204, and the top slit of the safety protection block 205 elastically slides and clamps the introduction needle 204. When the introduction needle 204 is pulled out, the introduction needle 204 moves relative to the safety protection block 205. When it moves to a certain position, the notch of the introduction needle 204 is clamped by the elastic snap-on of the safety protection block 205, and the introduction needle 204 cannot slide. The needle tip is fixed in the protection cavity of the safety protection block 205, and the fingers and any part of the human body will not touch the needle tip, avoiding stabbing of the human body.

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

[0050] The bottom of the medicine inlet valve 3 is clamped in the through hole of the lower shell 401 of the medicine bag, and a medicine inlet rubber plug 301 is embedded in the bottom opening of the medicine inlet valve 3, and the double-sided adhesive tape 5 is provided with a through hole to expose the medicine inlet rubber plug 301. The medicine inlet rubber plug 301 is used for the needle to pierce and inject the medicine solution, and the channel left by the needle after the needle is pulled out is closed.

[0051] How it works

[0052] Before using the patch pump, fill the syringe with liquid medicine, pierce the medicine inlet plug 301 of the medicine inlet valve 3 with the syringe, and inject the liquid medicine into the medicine inlet valve 3. The liquid medicine enters the elastic medicine bag 405 through the connected medicine bag central tube 404. The elastic medicine bag 405 expands under the pressure of the liquid medicine to store the liquid medicine, and the lower shell 401 and the upper shell 402 of the medicine bag constrain the shape of the elastic medicine bag 405.

[0053] When using the patch pump, first tear off the double-sided adhesive 5 covering layer, then apply the patch pump to the human skin (usually the abdomen and thigh), press the needle inserter handle 203, at this time, the soft needle 208 is driven by the introduction needle 204 and penetrates into the subcutaneous tissue of the human body, then pull out the needle inserter handle 203, the needle inserter handle 203 takes out the introduction needle 204, and constructs a channel between the inner cavity of the liquid path adapter 206 and the subcutaneous tissue of the human body, and the liquid medicine is slowly injected into the subcutaneous tissue of the human body under the pressure of the elastic medicine bag 405;

[0054] Since the regulating valve core 209 is always in close contact with the flow regulating push rod 406, during the injection process of the medicine, the injection pressure of the elastic medicine bag 405 is the largest at the beginning, and the depth of the conical head of the regulating valve core 209 inserted into the transverse branch of the liquid circuit adapter 206 is the deepest. At this time, the cross-sectional area of ​​the flow channel in the transverse branch is the smallest. As the injection progresses, the elastic medicine bag 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, and the cross-sectional area of ​​the flow channel in the transverse branch gradually increases, so that the amount of medicine injected per unit time is relatively stable, ensuring that the injection rate of the medicine is relatively stable during the entire injection process.

[0055] It should be noted that the above content only illustrates the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications all fall within the protection scope of the claims of the present invention.

Claims

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

2. A patch pump according to claim 1, characterized in that, The medicine bag assembly (4) comprises: a medicine bag lower shell (401) and a medicine bag upper shell (402) assembled together; a medicine bag central tube (404) is placed in a storage cavity formed between the medicine bag lower shell (401) and the medicine bag upper shell (402); one end of the medicine bag central tube (404) is connected to a medicine inlet valve (3) via a hose (6); an elastic medicine bag (405) is elastically wrapped around the outer wall of the medicine bag central tube (404); and both ends of the elastic medicine bag (405) are sealed and fixed to the outer wall of the medicine bag central tube (404); the inner cavity of the medicine bag central tube (404) is connected to the elastic medicine bag (405) via a plurality of evenly distributed through holes on the medicine bag central tube (404); and the medicine bag lower shell (401) and the medicine bag upper shell (402) are jointly connected to a flow regulating push rod (406) in a transverse sliding manner.

3. A patch pump according to claim 2, characterized in that, A medicine bag fixing ring (403) is elastically sleeved on both ends of the elastic medicine bag (405), and the two medicine bag fixing rings (403) are both in contact with the inner walls of the medicine bag lower shell (401) and the medicine bag upper shell (402).

4. A patch pump according to claim 2, characterized in that, The medicine bag upper shell (402) is made of a transparent material, and the upper cover (1) is provided with a through hole for exposing the medicine bag upper shell (402).

5. A patch pump according to claim 2, characterized in that, The needle insertion assembly (2) comprises: an annular needle insertion device shell (201) which is clamped in the flat through hole of the lower shell (401) of the medicine bag; the inner wall of the needle insertion device shell (201) is slidably connected with a liquid circuit adapter (206) in an upper and lower limit position; a sealing plug (207) is embedded in the top opening of the liquid circuit adapter (206), and an introduction needle (204) is inserted into the sealing plug (207); a soft needle (208) extends from the bottom through hole of the liquid circuit adapter (206); the introduction needle (204) is slidably inserted into the center hole of the soft needle (208); the liquid circuit adapter The transverse branch of (206) is connected to the drug inlet valve (3) through a hose (6), and the liquid circuit adapter (206) is laterally slidably connected to a regulating valve core (209) coaxial with its transverse branch. The conical head portion of the regulating valve core (209) is inserted into the transverse branch 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 tube 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) is 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 needle inserter housing (201) is extended with at least two elastic extension pieces (201a), and the initial slots (201b) of all the elastic extension pieces (201a) are jointly engaged with the bottom extension ring of the liquid circuit adapter (206), and the initial slot (201b) is provided with a chamfer adapted to guide the liquid circuit adapter (206) to move downward, and the bottom extension ring of the liquid circuit adapter (206) is stuck when it moves below the elastic extension piece (201a).

7. A patch pump according to claim 5, characterized in that: The top of the liquid circuit adapter (206) is clamped with a needle ring (202), the top of the needle ring (202) is clamped with a needle inserter handle (203), and the needle inserter handle (203) is fixedly connected to the introduction needle (204).

8. A patch pump according to claim 7, characterized in that: The introduction needle (204) slides through a safety protection block (205), and the safety protection block (205) is fixedly inserted into a notch at the top of the liquid path adapter (206). The top of the safety protection block (205) elastically clamps the introduction needle (204), and the introduction needle (204) is provided with a notch adapted to be elastically clamped by 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 adapted to fit the introduction 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 path adapter (206).

10. A patch pump according to claim 2, characterized in that: The bottom of the medicine inlet valve (3) is clamped in the through hole of the flat plate of the lower shell (401) of the medicine bag, and a medicine inlet rubber plug (301) is embedded in the bottom opening of the medicine inlet valve (3), and the double-sided tape (5) is provided with a through hole for exposing the medicine inlet rubber plug (301).

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