A type of patch-type infusion pump

Abstract

This invention relates to a patch-type infusion pump, belonging to the field of drug infusion technology. The patch-type infusion pump includes a first housing and a second housing. A connector is disposed within the second housing. The drug storage structure includes a drug capsule, a catheter, and a slide rail. The drug capsule surrounds the outer periphery of the catheter. The drug capsule and catheter are fixedly connected to the slide rail and can rotate around the center of the second housing. A button body can move along the central axis of the second housing. A locking tongue is provided on one side of the button body, which can abut against the slide rail. One end of the injection needle is connected to the connector, and the other end can extend from the needle outlet to pierce the skin. After injection, the button body rebounds under the push of a first elastic body, allowing the injection needle to be withdrawn. The slider then abuts against the button body. This infusion pump is simple to operate, allowing for one-button injection. After injection, the button automatically rebounds to automatically remove the needle. It is equipped with multiple safety protection devices to prevent accidental injury. Furthermore, it is compact and convenient for patients to carry, enabling injections anytime.

Description

Technical Field

[0001] This invention relates to a patch-type infusion pump, belonging to the field of drug infusion technology. Background Technology

[0002] In the clinical medical field, patch-type infusion pumps, as an injection device that can be directly applied to the surface of the human skin, are widely used in scenarios such as insulin infusion, analgesic drug administration, and hormone therapy due to their characteristics of not requiring tubing, being discreet to wear, and being able to achieve continuous or precise injection. They provide great convenience, especially for patients who need long-term regular injections, and effectively improve patients' medication adherence and quality of life.

[0003] Currently, most commercially available transdermal infusion pumps use an active drive system. This type of device presents several problems in practical applications. Active drive devices contain numerous built-in electronic components, and patients inevitably experience sweating during use, which can cause moisture to corrode these components, leading to short circuits, malfunctions, and damage, affecting the normal operation and safety of the device. Furthermore, they not only have limited medication storage space and are expensive, placing a heavy financial burden on patients, but also have cumbersome operation procedures, requiring patients to perform multiple manual adjustments and parameter settings. This is difficult for patients with limited self-care abilities, increasing the risk of health problems due to operational errors.

[0004] Chinese patent document CN222605130U discloses a hand-twisted dressing infusion device. The device has gears inside and injects medicine by twisting. It does not require any electronic components, which solves the problems of short circuits and failures of electronic components due to sweating and other reasons in the prior art. However, the device is inconvenient to operate and requires frequent replacement of multiple components. It is not convenient for the elderly or people with weak self-care ability to operate. Moreover, it cannot automatically remove the needle after injection and has no safety protection device, which can easily cause accidental injury.

[0005] Chinese patent document CN120983735A discloses a spiral-type drug storage mechanism and a patch-type infusion pump. This infusion pump, by setting a spiral-shaped drug liquid chamber, makes reasonable use of vertical space, increasing the drug storage space while keeping the size of the patch pump relatively small. However, its structure is complex, and it contains electronic components, resulting in high costs and imposing a heavy economic burden on patients.

[0006] Therefore, there is an urgent need for an injection pump that requires no electronic components, is easy to operate, and is safe and reliable. Summary of the Invention

[0007] To address the aforementioned issues, this invention provides a patch-type infusion pump that requires no electronic components, is simple to operate, allows for one-button injection, and enables automatic needle removal, ensuring safety and reliability. This solves the problems of short circuits and failures of electronic components in existing technologies, as well as the inconvenience of operation.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows: This invention provides a patch-type infusion pump, including... A first housing and a second housing, the first housing being connected to the second housing to form an injection cavity, and a connecting member being provided inside the second housing; A drug storage structure is installed in the second housing. The drug storage structure includes a drug capsule, a conduit, and a slide rail. The drug capsule wraps around the outer periphery of the conduit. The drug capsule and the conduit are fixedly connected to the slide rail, which is rotatable around the center of the second housing. The end of the drug capsule facing away from the slide rail is connected to the connector. The device comprises a button body and an injection needle. The button body is installed in the second housing and can move along the central axis of the second housing. The injection needle is installed on the button body. A locking tongue is provided on one side of the button body. The upper end of the locking tongue is provided with a flat surface, and the lower end of the locking tongue is provided with a bevel. During injection, the button body moves the locking tongue and the injection needle downward. The locking tongue retracts when the bevel abuts against the slide rail and pops out when it passes the slide rail. After the locking tongue pops out, the flat surface of the locking tongue abuts against the slide rail. One end of the injection needle pierces the connector, and the other end extends from the bottom of the second housing and pierces the skin, connecting the drug capsule with the skin. The drug solution flows through the connector and the injection needle under the contraction of the drug capsule to achieve injection. After the injection is completed, the button body rebounds under the push of the first elastic body. After the injection needle is pulled out, the slider abuts against the button body.

[0009] In one embodiment of the present invention, the slider is provided with a first arm and a second arm. A third inclined surface is provided on one side of the first arm, which abuts against the button body. The second arm abuts against the second housing. When injection is completed, as the button body rebounds under the action of the first elastic body, the first arm breaks free from the constraint of the button body and rebounds, causing the third inclined surface to be positioned below the button body and abut against it. This prevents the button body from moving downwards again, achieving automatic needle locking protection of the injection pump after injection is completed.

[0010] In one embodiment of the present invention, the bottom of the second housing is provided with a first slot, a second groove, and a third groove, and the slider is installed in the first slot; the second groove has a beveled edge on the side near the third groove, and in the initial state, the second arm abuts against the second groove; in the injection state, the second arm abuts against the third groove. When the button rebounds and the pressure is released, the second arm is restricted by the third groove and cannot move backward, thereby restricting the movement of the slider, causing the third beveled surface on the first arm to abut against the button body, thereby restricting the movement of the button body, realizing automatic needle locking, preventing accidental button presses that could cause the injection needle to pop out and cause injury to the user.

[0011] In one embodiment of the present invention, the slide rail includes an indicator needle and a first groove, the first groove being located on one side of the latch, the sac and the catheter being fixedly connected to the indicator needle, and a limiting rib being provided inside the second housing, the slide rail rotating along the limiting rib.

[0012] In one embodiment of the present invention, the connector is provided with a first through hole, a second through hole and a third through hole, a rubber stopper is installed on the first through hole, a rubber sleeve is fitted at the end of the second through hole, the third through hole is connected to the sac, and both the second through hole and the third through hole are provided with a filter device.

[0013] In one embodiment of the present invention, the filtration device includes a first filter housing, a hydrophobic membrane, a sealing element, and a second filter housing. The first filter housing is sleeved on the outside of the second filter housing, and the hydrophobic membrane and the sealing element are installed between the first filter housing and the second filter housing. The sealing element is used to form a seal between the filtration device and the connecting member. The hydrophobic membrane allows only air to pass through, but not liquid. Therefore, during the dosing process, gas is discharged through the filtration device, creating a closed space inside.

[0014] In one embodiment of the present invention, a button is included, the button being connected to a button body, the button body including a first inclined surface and a first protrusion, the first inclined surface abutting against a second inclined surface of the slider, a first elastic body being sleeved on the outer periphery of the first protrusion, and a second elastic body being disposed between the latch and the button body.

[0015] In one embodiment of the present invention, the device includes a tube frame, a metal tube, and a sealing film. The bottom of the second housing is provided with a needle outlet and a second protrusion. The second protrusion is provided with a stepped hole. The two ends of the first elastic body abut against the button body and the second protrusion, respectively. The sealing film is installed at the needle outlet. The tube frame is sleeved on the outer periphery of the metal tube and placed inside the second protrusion.

[0016] In one embodiment of the present invention, the injection needle includes a long needle and a short needle. The long needle passes through the first protrusion and the second protrusion and can exit from the needle outlet to pierce the skin. The short needle can pierce the rubber sleeve and connect the drug capsule with the skin.

[0017] In one embodiment of the present invention, a first retaining spring is included, which engages with the button. The first housing is further provided with a display window and a buckle. A scale is provided on one side of the display window. The second housing is provided with a second slot, which is connected to the buckle. The bottom of the second housing is provided with a support structure and an applicator. The support structure consists of protrusions, with at least three protrusions. A first retaining spring is fitted around the outer periphery of the button to limit its vertical movement and prevent accidental activation. A scale display is printed on one side of the display window to show the dosage of the medication. Multiple support structures provide support for the infusion pump, allowing it to be placed stably on a flat surface for easy injection.

[0018] The beneficial effects of this invention are: The patch-type infusion pump provided by this invention has the following advantages: 1. The patch-type infusion pump provided by this invention has a simple structure and contains no internal electronic components, avoiding the problem of short circuits and malfunctions caused by moisture corrosion of electronic components due to sweating or other reasons. Furthermore, this infusion pump is easy to operate, with one-button injection and automatic needle removal after injection. Patients do not need to master complex operating procedures or perform frequent manual adjustments, greatly reducing their operational burden and minimizing various health risk factors. It has a low operating threshold and high adaptability, making it particularly suitable for elderly patients, post-operative recovery patients, and patients with limited self-care abilities such as those with limb mobility impairments, enabling non-professionals to safely and smoothly complete injection procedures.

[0019] 2. This patch-type infusion pump features a flexible drug capsule, one end of which is fixedly connected to a slide rail. The slide rail has a first groove located on one side of the locking tongue. When the capsule is empty, there is no interference between the locking tongue and the slide rail, allowing the locking tongue to move up and down following the button and its body. When the capsule contains medication, interference occurs between the locking tongue and the slide rail. Pressing the button initiates injection, causing the locking tongue to move downwards and engage with the slide rail, ensuring stable injection. After injection, the slide rail returns to its original position, eliminating interference between the slide rail and the locking tongue. The button then moves the injection needle upwards, automatically withdrawing the needle. This design links the button's rebound, stable injection, and automatic needle withdrawal to the dosage in the capsule. Through the design of the locking tongue, flexible drug capsule, and slide rail, a one-button injection and automatic needle withdrawal function is achieved. Furthermore, there is no need to repeatedly monitor the medication content during injection; the needle automatically withdraws after the injection is complete.

[0020] 3. This patch-type infusion pump features a flexible drug capsule, one end of which is fixedly connected to a slide rail. An indicator needle on the slide rail is positioned below the display window. The amount of medication in the capsule is linked to the rotation of the slide rail. The expansion or contraction of the capsule due to an increase or decrease in medication volume drives the slide rail, causing the indicator needle to move below the display window. This allows for real-time display of the medication content in the capsule, facilitating precise injection based on actual usage needs.

[0021] 4. This patch-type infusion pump, through the use of a slider and a first retaining spring, can restrict the movement of the button and automatically lock the needle to prevent accidental injury. Before injection, the first retaining spring engages to prevent the button from being accidentally pressed when there is no medication, which could cause the injection needle to extend and become contaminated. After injection, the slider abuts against the button body, making the button unable to be pressed, locking the button and injection needle, preventing reuse and the resulting infection, and increasing the safety of the infusion pump.

[0022] 5. This patch-type infusion pump is compact and easy for patients to carry, allowing for injections anytime. The first housing has a display window with graduations on one side, facilitating patient monitoring of the dosage and ensuring precise injection. An internal filter removes air during administration, preventing air from entering the patient's body and causing embolisms or other safety hazards. Furthermore, the pump is inexpensive, reducing the burden on patients. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of the patch-type injection pump provided by the present invention.

[0025] Figure 2 This is a perspective view of the adhesive infusion pump provided by the present invention.

[0026] Figure 3 This is an exploded view of the patch-type infusion pump provided by the present invention.

[0027] Figure 4 This is a top view of the patch-type infusion pump provided by the present invention.

[0028] Figure 5 This is a cross-sectional view of the drug storage structure provided by the present invention without any drug.

[0029] Figure 6 This is a three-dimensional view of the drug storage structure containing the drug provided by the present invention.

[0030] Figure 7 This is a cross-sectional view of the drug feeding process of the drug feeding device provided by the present invention.

[0031] Figure 8 This is a cross-sectional view of the drug dispensing process of the drug feeding device provided by the present invention.

[0032] Figure 9 This is a schematic diagram of the structure of the indicator needle located at point A provided by the present invention.

[0033] Figure 10 This is a schematic diagram of the structure of the indicator needle located at point B provided by the present invention.

[0034] Figure 11 This is a cross-sectional view of the button body provided by the present invention.

[0035] Figure 12 This is a cross-sectional view of the injection state provided by the present invention.

[0036] Figure 13 This is a top view of the initial state of the patch-type infusion pump provided by the present invention.

[0037] Figure 14 This is a top view of the injection state of the patch-type infusion pump provided by the present invention.

[0038] Figure 15 This is a cross-sectional view of the initial state of the patch-type infusion pump provided by the present invention.

[0039] Figure 16 This is a cross-sectional view of the injection state of the patch-type infusion pump provided by the present invention.

[0040] Figure 17 This is a schematic diagram of the structure of the second housing and the slider provided by the present invention.

[0041] Figure 18 This is a cross-sectional view of the second housing and slider provided by the present invention.

[0042] Figure 19 This is a cross-sectional view of the injection state of the patch-type infusion pump provided by the present invention.

[0043] Figure 20 This is a cross-sectional view of the completed injection state of the patch-type infusion pump provided by the present invention.

[0044] Figure 21 This is another cross-sectional view of the initial state of the patch-type infusion pump provided by the present invention.

[0045] Figure 22 This is a cross-sectional view of the injection state of the patch-type infusion pump provided by the present invention from another perspective.

[0046] In the picture: 1. First retaining ring; 2. First housing; 201. Injection port; 202. Display window; 203. Buckle; 3. Button; 4. Injection needle; 401. Long needle; 402. Short needle; 5. Button body; 501. First inclined surface; 502. First boss; 6. First elastic body; 7. Second elastic body; 8. Locking tongue; 9. Slider; 901. Second inclined surface; 902. Third inclined surface; 903. First support arm; 904. Second support arm; 10. Tube rack; 11. Metal tube; 12. Sealing film; 13. Second retaining ring; 14. Slide rail; 1401. Indicator needle; 1402. First groove; 5. Catheter; 16. Drug capsule; 17. First filter housing; 18. Hydrophobic membrane; 19. Seal; 20. Second filter housing; 21. Rubber stopper; 22. Connector; 2201. First through hole; 2202. Second through hole; 2203. Third through hole; 23. Rubber sleeve; 24. Second housing; 2401. Support structure; 2402. Needle outlet; 2403. First slot; 2404. Second groove; 2405. Third groove; 2406. Second slot; 2407. Limiting rib; 2408. Second boss; 25. Adhesive; 26. Syringe; 100. Filtering device. Detailed Implementation

[0047] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] like Figures 1 to 4 , Figure 15As shown, this invention provides a patch-type infusion pump, which includes a first housing 2 and a second housing 24. The first housing 2 and the second housing 24 are connected, forming a complete injection chamber. The first housing 2 is provided with an injection port 201, through which a syringe 26 injects medication into the infusion pump. The first housing 2 is also provided with a display window 202, one side of which is printed with scale markings for displaying the dosage of the medication. Multiple latches 203 are also provided inside the first housing 2, evenly distributed on the inner side of the first housing 2, connecting the first housing 2 to the second housing 24 via the latches 203.

[0049] In some embodiments, a button 3 is installed on the side of the first housing 2 opposite to the second housing 24. The button 3 is used to trigger the injection action. A first retaining spring 1 is provided between the button 3 and the first housing 2. The first retaining spring 1 is sleeved on the outer periphery of the button 3 and can limit the button 3, restricting the up and down movement of the button 3 and preventing accidental activation.

[0050] In some embodiments, a support structure 2401 is provided at the bottom of the second housing 24. Multiple support structures 2401 are provided to support the injection pump, allowing it to be stably placed on a flat surface, facilitating drug injection by the syringe 26. A needle outlet 2402 is provided in the middle of the second housing 24. When the button 3 is pressed, the injection needle 4 installed in the first housing 2 and the second housing 24 can be inserted from the needle outlet 2402 for injection.

[0051] Specifically, in this embodiment, the support structure 2401 consists of three protrusions arranged in a triangle, which enhances the stability of the injection pump.

[0052] like Figure 3 , Figures 5 to 8 As shown, in some embodiments, the second housing 24 is provided with a drug inlet device and a drug storage structure. The drug inlet device includes a filter device 100, a connector 22, a rubber stopper 21, a rubber sleeve 23, and an injection needle 4. The second housing 24 has multiple protrusions and grooves, which, through the cooperation of the protrusions and grooves, allow the drug inlet device to be embedded within the second housing 24. The connector 22 is a three-way tube with three through holes: a first through hole 2201, a second through hole 2202, and a third through hole 2203, all of which are interconnected. The rubber stopper 21 is a soft rubber stopper installed on the first through hole 2201 of the connector 22. The side of the rubber stopper 21 facing away from the connector 22 abuts against the injection port 201 and is coaxially arranged, facilitating the injection of medication into the connector 22 by the syringe 26.

[0053] In some embodiments, a rubber sleeve 23 is fitted around the outer periphery of the second through hole 2202 of the connector 22. A filter device 100 is installed on the side of the rubber sleeve 23 opposite to the connector 22. The third through hole 2203 communicates with the drug storage device, and a filter device 100 is installed on its side. The drug injected through the rubber stopper 21 enters the drug storage structure through the third through hole 2203. The filter device 100 includes a first filter housing 17, a hydrophobic membrane 18, a sealing member 19, and a second filter housing 20. The first filter housing 17 is fitted around the outer periphery of the second filter housing 20, and the hydrophobic membrane 18 and the sealing member 19 are installed between the first filter housing 17 and the second filter housing 20. The sealing member 19 is used to form a seal between the filter device 100 and the connector 22. The hydrophobic membrane 18 allows only air to pass through, but not liquid. Therefore, during the drug addition process, gas is discharged through the filter device 100, forming a closed space inside.

[0054] like Figures 3 to 10As shown, in some embodiments, the drug storage structure includes a drug capsule 16, a conduit 15, and a slide rail 14. The drug capsule 16 has a certain elasticity and wraps around the outer periphery of the conduit 15. The conduit 15 has a guiding function, which can initially guide the extension direction of the entire drug capsule 16, preventing the drug capsule 16 from bending randomly during injection, causing it to get stuck and preventing smooth injection. The conduit 15 and the drug capsule 16 are embedded in the cavity formed between the protrusions of the second housing 24 and the first housing 2. One end of the drug capsule 16 is fixedly connected to the third through hole 2203. One end of the slide rail 14 is provided with an indicator needle 1401. The ends of the drug capsule 16 and the conduit 15 facing away from the third through hole 2203 pass through the indicator needle 1401 and are fixed by the second retaining spring 13. The end of the drug capsule 16 facing away from the third through hole 2203 is fixedly connected to the conduit 15 and sealed. The side of the display window 202 closest to the injection port 201 is designated as point B, and the side furthest from the injection port 201 is designated as point A. When the indicator needle 1401 stops at point B, the sac 16 is full; when the indicator needle 1401 is at point A, the sac 16 is empty. After the medication is injected into the connector 22 through the syringe 26 piercing the rubber stopper 21, the medication flows to the second through-hole 2202 and the third through-hole 2203. Gas inside the cavity is expelled through the filter device 100 by the medication, creating a sealed space. Pushing the plunger of the syringe 26 to add medication, due to the filter device 100 at the second through-hole 2202, the medication can only enter the sac 16 through the third through-hole 2203. During drug administration, the drug sac 16 gradually expands as the amount of drug increases, with both its diameter and length increasing simultaneously. Due to the limited space formed by the ribs in the second housing 24 and the first housing 2, the maximum diameter under injection pressure is slightly smaller than the space formed by the ribs to ensure smooth movement of the expanded drug sac 16. The expansion size of the drug sac 16 can be preset according to actual needs. However, since the end of the drug sac 16 is fixed to the indicator needle 1401, as the drug sac 16 expands, the slide rail 14 is pushed, and the indicator needle 1401 moves from point A to point B. The drug content in the drug sac 16 can be observed in real time through the display window 202. The user can add the required dosage of drug to the drug sac 16 according to actual injection needs. When the indicator needle 1401 moves to point B, it indicates that the drug is full. When button 3 is pressed, causing the injection needle 4 to pierce the skin for injection, the medication sac 16 begins to shrink as the amount of medication decreases. During this shrinkage, the length and diameter of the sac 16 decrease simultaneously. As the sac 16 contracts, the slide rail 14 is pulled back by the sac 16, and the indicator needle 1401 slides towards point A. Injection stops when the needle reaches point A. By linking the medication content in the sac 16 to the rotation of the slide rail 14, the sac 16 expands or contracts as the medication content increases or decreases, causing the slide rail 14 to rotate. This moves the indicator needle 1401 below the display window 202, thus enabling real-time display of the medication content in the sac, facilitating precise injection based on actual usage needs.

[0055] like Figure 3 , Figure 11 , Figure 12 , Figure 15 and Figure 16 As shown, in some embodiments, the injection pump further includes a button body 5, which is connected to the button 3 and can be fastened together by a snap-fit. A groove is formed on the side of the button body 5 near the button 3, and through holes are formed at both ends of the groove for placing the injection needle 4. Both ends of the injection needle 4 are pointed, and the injection needle 4 is bent to form a long needle 401 and a short needle 402, differing only in length. The injection needle 4 is placed in the groove of the button body 5, and the long needle 401 and short needle 402 pass through the through holes on the button body 5.

[0056] In some embodiments, a first protrusion 502 is provided at the center of the button body 5, and a second protrusion 2408 is provided at the center of the second housing 24. A through hole is provided at the center of the first protrusion 502 to facilitate the passage of a long needle 401. A stepped hole is provided in the second protrusion 2408, and the stepped hole in the second protrusion 2408 communicates with the needle outlet 2402 to facilitate the exit of the long needle 401. A first elastic body 6 is sleeved on the outer side of the first protrusion 502. The two ends of the first elastic body 6 respectively abut against the button body 5 and the stepped hole in the second protrusion 2408, which can provide elastic force for the reset of the button body 5.

[0057] In some embodiments, the injection pump further includes a tube holder 10, a metal tube 11, and a sealing membrane 12. The sealing membrane 12 is located near the needle outlet 2402, and the metal tube 11 is installed on the side of the sealing membrane 12 facing away from the needle outlet 2402. The tube holder 10 is sleeved around the outer periphery of the metal tube 11. The tube holder 10, metal tube 11, and sealing membrane 12 are all installed in the stepped hole of the second boss 2408. The tube holder 10 is used to fix the metal tube 11. Due to certain errors in the entire assembly process, the injection needle 4 undergoes some deformation, while the needle outlet 2402 is not very large. Therefore, the metal tube 11 is provided to provide guidance for the long needle 401. The metal tube 11 is made of metal to reduce friction and make the injection process smoother. If it were made of plastic, the needle would easily pierce into the plastic wall, causing damage.

[0058] like Figure 3 , Figures 5 to 10 , Figure 15 , Figure 16As shown, in some embodiments, the button body 5 has a groove on the side opposite to the injection port 201. A locking tongue 8 and a second elastic body 7 are installed in the groove. The second elastic body 7 is located inside the hole of the locking tongue 8, with its two ends abutting against the locking tongue 8 and the button body 5, respectively. The second elastic body 7 provides a pushing force to the locking tongue 8, ensuring that the locking tongue 8 remains protruding in the absence of external force. The lower part of the protruding portion of the locking tongue 8 is a slope. When an external force presses upward against the slope, the locking tongue 8 retracts; when the external force is removed, the locking tongue re-protrudes. The upper part of the locking tongue 8 is a flat surface, which abuts against the slide rail 14 to limit its movement.

[0059] In some embodiments, a first groove 1402 is provided on the side of the slide rail 14 near the button body 5, located on one side of the locking tongue 8. This ensures that when the injection pump is in an unloaded state, i.e., when there is no medicine in the capsule 16, there is no spatial interference between the locking tongue 8 and the slide rail 14. The locking tongue 8, the button body 5, and the button 3 are integrated into a single structure, allowing the locking tongue 8 to move up and down within the first groove 1402. However, when the injection pump is fully loaded or in an injection state, i.e., when the capsule 16 contains medicine, the first groove 1402 on the slide rail 14 passes over the locking tongue 8, causing the locking tongue 8 to interfere with the slide rail 14. When the button 3 is pressed, the locking tongue 8 moves downward from above under the action of the button body 5. When the inclined surface below the locking tongue 8 abuts against the slide rail 14, it is squeezed back under the pressure from above and continues to move downward. After passing the slide rail 14, the locking tongue 8 pops out under the action of the second elastic body 7 and abuts against the slide rail 14. At this time, the entire button 3 and button body 5 cannot move upward because the locking tongue 8 is restricted below the slide rail 14. Only when the amount of medicine in the sac 16 decreases to 0, that is, when the slide rail 14 returns to its original position and the first groove 1402 is above the locking tongue 8, there is no interference between the slide rail 14 and the locking tongue 8. The locking tongue 8, together with the button 3 and the button body 5, moves upward under the push of the first elastic body 6, and drives the injection needle 4 to be pulled out, thus realizing automatic needle removal.

[0060] like Figures 17 to 22 As shown, in some embodiments, the injection pump is further provided with a slider 9, which is sleeved on the outside of the second boss 2408 and fixed in the first slot 2403. The first slot 2403 has multiple grooves that limit the slider 9, allowing it to move only horizontally and preventing it from rotating around the central axis of the second housing 24. Two elastic arms are provided on both sides of the slider 9, namely a first arm 903 and a second arm 904, with the first arm 903 and the second arm 904 facing opposite directions. The first arm 903 can abut against the button body 5, restricting the downward movement of the button body 5; the second arm 904 can abut against the second housing 24, thereby restricting the displacement of the slider 9.

[0061] In some embodiments, a first inclined surface 501 is provided on one side of the button body 5, and a second inclined surface 901 is provided on one side of the slider 9. The first inclined surface 501 can abut against the second inclined surface 901. During the downward movement of the button body 5, the first inclined surface 501 compresses the second inclined surface 901, causing the slider 9 to move. The first arm 903 of the slider 9 is compressed and bent inside the button body 5. A third inclined surface 902 is provided at one end of the first arm 903. When the injection is completed, when the button body 5 rebounds under the action of the first elastic body 6, the first arm 903 is released from the restriction of the button body 5 and rebounds, so that the third inclined surface 902 is located below the button body 5 and abuts against the button body 5, preventing the button body 5 from moving downward again. This achieves automatic needle locking protection of the injection pump after the injection is completed.

[0062] In some embodiments, the bottom of the second housing 24 is provided with a second groove 2404 and a third groove 2405, with the second groove 2404 located on the side of the third groove 2405 opposite to the second boss 2408. The second arm 904 of the slider 9 can abut against the second groove 2404 and the third groove 2405 respectively. The second groove 2404 can provide positioning and limiting functions for the second arm 904. In the initial state, the second arm 904 abuts against the second groove 2404 to prevent the slider 9 from being displaced due to external factors when not triggered. The third groove 2405 also has a limiting function, but it limits the second arm 904 after it has moved. The side of the second groove 2404 near the third groove 2405 is provided with an inclined slope to facilitate the movement of the second arm 904. When the slider 9 is displaced by the pressure of the button body 5, the second arm 904 moves along the inclined surface in the second groove 2404 and moves into the third groove 2405. When button 3 rebounds and the pressure is released, the second arm 904 is restricted by the third groove 2405 and cannot move backward, thus restricting the movement of slider 9. This causes the third inclined surface 902 on the first arm 903 to abut against the button body 5, thereby restricting the movement of the button body 5, achieving automatic needle locking, and preventing accidental button 3 activation, which could cause the injection needle to pop out and injure the user.

[0063] like Figure 15 and Figure 16 As shown, in some embodiments, a plurality of second slots 2406 are evenly distributed on one side of the second housing 24. The number of second slots 2406 matches the number of buckles 203. The second housing 24 is fixedly connected to the first housing 2 through the cooperation of the second slots 2406 and the buckles 203. The second housing 24 is also provided with a limiting rib 2407. The limiting rib 2407 is a ring structure and is coaxial with the second housing 24. The limiting rib 2407 has an annular groove, which can provide guidance for the slide rail 14, so that the slide rail 14 can rotate along the annular groove.

[0064] like Figures 1 to 3As shown, in some embodiments, an adhesive patch 25 is attached to the side of the second housing 24 opposite to the first housing 2. The adhesive patch 25 has a certain degree of adhesiveness and can be adhered to the surface of human skin. The adhesive patch 25 can be one of the following types: medical adhesive tape, non-woven adhesive tape, waterproof adhesive tape, etc.

[0065] Optionally, the first elastic body 6 and the second elastic body 7 are springs, which have a simple structure, are easy to install, and can provide a restoring force for the button body 5 and the locking tongue 8. The sealing element 19 is an O-ring, used to ensure the sealing between the filter device 100 and the connector 22.

[0066] Working principle of the invention: 1. Initial state: The sac 16 contains no medication, the indicator needle 1401 is at point A, the first groove 1402 is located below the latch 8, the slide rail 14 and the latch 8 do not interfere with each other spatially, the latch 8, the button body 5, and the button 3 can move up and down, and can drive the injection needle 4 to move up and down. To prevent accidental activation, a first retaining spring 1 is provided on the upper part of the first housing 2. The first retaining spring 1 is engaged in the groove of the button 3, which can restrict the up and down movement of the button 3, preventing the user from accidentally activating the button 3, causing the injection needle 4 to extend out of the injection pump, causing injury to the user or contaminating the injection needle 4.

[0067] 2. Medication Injection: Place the syringe pump on a flat surface and add medication to the syringe pump using syringe 26. Syringe 26 pierces the rubber stopper 21 through injection port 201, pushing syringe 26 to inject medication into connector 22. The medication flows through the second through hole 2202 and the third through hole 2203 into the two filter devices 100 and the medication capsule 16. Since the filter device 100 is equipped with a hydrophobic membrane 18, the gas in connector 22 is discharged through the hydrophobic membrane 18, forming a sealed space between connector 22 and medication capsule 16. As the medication is advanced, medication capsule 16 gradually expands, with both its diameter and length increasing. However, since the end of medication capsule 16 is fixed to indicator needle 1401, as medication capsule 16 expands, slide rail 14 is pushed, and indicator needle 1401 moves from point A to point B. When it reaches point B, it indicates that medication capsule 16 is full.

[0068] 3. Injection State: When injection is required, remove the first retaining spring 1 to allow button 3 to be pressed. Attach the injection pump to the desired injection site using the adhesive patch 25. Pressing button 3 causes the injection needle 4 and button body 5 to move downwards. The short needle 402 of the injection needle 4 pierces the rubber sleeve 23, while the long needle 401 pierces the sealing membrane 12 and enters the skin through the needle outlet 2402 for injection. Due to the contractile nature of the drug capsule 16, the medication enters the rubber sleeve 23 along the connector 22 and is injected into the skin along the short needle 402. The downward movement of button body 5 causes the locking tongue 8 to retract and move downwards together. After the locking tongue 8 reaches below the slide rail 14, it pops out under the elastic force of the second elastic body 7 and abuts against the slide rail 14, preventing the injection needle 4 from moving upwards during injection and ensuring safe and stable injection. At this time, under the pressure of the button body 5, the slider 9 moves, the first arm 903 is compressed and bent inside the button body 5, and the second arm 904 moves from the second groove 2404 to the third groove 2405.

[0069] 4. Injection Completion: As the medication decreases, the sac 16 shrinks, pulling the slide rail 14 back. The indicator needle 1401 returns from point B to point A, indicating injection completion. The first groove 1402 returns to its original position, eliminating interference between the slide rail 14 and the locking tongue 8. The locking tongue 8, button body 5, and button 3 move upward under the push of the first elastic body 6, causing the injection needle 4 to move upward, achieving automatic needle removal after injection. The upward movement of button body 5 causes the compressed first arm 903 to pop out and abut against button body 5, limiting button body 5, enhancing the safety of the injection pump, and preventing accidental activation of button 3 and potential harm to the user.

[0070] The infusion pump provided by this invention has a simple structure and compact size, making it convenient for patients to carry and administer injections anytime. It requires no electronic components, avoiding the problem of moisture damage to electronic components leading to short circuits and potential destruction. The pump is easy to operate; injection is completed simply by pressing button 3, and the needle is automatically removed after injection, reducing the need for frequent manual operation and lessening the burden on patients, especially those with limited self-care abilities. Furthermore, the pump incorporates multiple safety features, including a first retaining spring 1, a slider 9, and a locking tongue 8, effectively preventing accidental injuries.

[0071] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A patch-type infusion pump, characterized in that, include: A first housing (2) and a second housing (24) are connected to form an injection cavity, and a connector (22) is provided inside the second housing (24). A drug storage structure is installed in the second housing (24). The drug storage structure includes a drug capsule (16), a conduit (15), and a slide rail (14). The drug capsule (16) wraps around the outer periphery of the conduit (15). The drug capsule (16) and the conduit (15) are fixedly connected to the slide rail (14). The slide rail (14) can rotate around the center of the second housing (24). One end of the drug capsule (16) away from the slide rail (14) is connected to the connector (22). The button body (5) and injection needle (4) are mounted in the second housing (24) and can move along the central axis of the second housing (24). The injection needle (4) is mounted on the button body (5). A locking tongue (8) is provided on one side of the button body (5). The upper end of the locking tongue (8) is provided with a flat surface, and the lower end of the locking tongue (8) is provided with a bevel. During injection, the button body (5) drives the locking tongue (8) and the injection needle (4) to move downwards. The tongue (8) retracts when it abuts against the inclined surface and the slide rail (14), and pops out when it passes the slide rail (14). After the locking tongue (8) pops out, the plane of the locking tongue (8) abuts against the slide rail (14). One end of the injection needle (4) is inserted into the connector (22), and the other end extends out from the bottom of the second housing (24), connecting the drug capsule (16) and the skin. The liquid flows through the connector (22) and the injection needle (4) under the contraction of the drug capsule (16) to achieve injection. After the injection is completed, the button body (5) rebounds under the push of the first elastic body (6), and after the injection needle (4) is pulled out, the slider (9) abuts against the button body (5).

2. The patch-type infusion pump according to claim 1, characterized in that, The slider (9) is provided with a first arm (903) and a second arm (904). A third inclined surface (902) is provided on one side of the first arm (903). The third inclined surface (902) can abut against the button body (5). The second arm (904) abuts against the second housing (24).

3. The patch-type infusion pump according to claim 2, characterized in that, The bottom of the second housing (24) is provided with a first slot (2403), a second groove (2404) and a third groove (2405), and the slider (9) is installed in the first slot (2403); the second groove (2404) is provided with a bevel on the side near the third groove (2405), and in the initial state, the second arm (904) abuts against the second groove (2404); in the injection state, the second arm (904) abuts against the third groove (2405).

4. The patch-type infusion pump according to claim 1, characterized in that, The slide rail (14) includes an indicator needle (1401) and a first groove (1402). The first groove (1402) is located on one side of the latch (8). The sac (16) and the catheter (15) are fixedly connected to the indicator needle (1401). A limiting rib (2407) is provided inside the second housing (24). The slide rail (14) rotates along the limiting rib (2407).

5. The patch-type infusion pump according to claim 1, characterized in that, The connector (22) is provided with a first through hole (2201), a second through hole (2202) and a third through hole (2203). A rubber plug (21) is installed on the first through hole (2201). A rubber sleeve (23) is fitted at the end of the second through hole (2202). The third through hole (2203) is connected to the medicine bag (16). Both the second through hole (2202) and the third through hole (2203) are provided with a filter device (100).

6. The patch-type infusion pump according to claim 5, characterized in that, The filtration device (100) includes a first filter housing (17), a hydrophobic membrane (18), a seal (19), and a second filter housing (20). The first filter housing (17) is sleeved on the outside of the second filter housing (20), and the hydrophobic membrane (18) and the seal (19) are installed between the first filter housing (17) and the second filter housing (20).

7. The patch-type infusion pump according to claim 5, characterized in that, Includes a button (3), which is connected to the button body (5). The button body (5) includes a first inclined surface (501) and a first boss (502). The first inclined surface (501) abuts against the second inclined surface (901) of the slider (9). The first elastic body (6) is sleeved on the outer periphery of the first boss (502). A second elastic body (7) is provided between the locking tongue (8) and the button body (5).

8. The patch-type infusion pump according to claim 7, characterized in that, The device includes a tube frame (10), a metal tube (11), and a sealing film (12). The bottom of the second housing (24) is provided with a needle outlet (2402) and a second boss (2408). The second boss (2408) is provided with a stepped hole. The two ends of the first elastic body (6) abut against the button body (5) and the second boss (2408) respectively. The sealing film (12) is installed at the needle outlet (2402). The tube frame (10) is sleeved on the outer periphery of the metal tube (11) and placed inside the second boss (2408).

9. The patch-type infusion pump according to claim 8, characterized in that, The injection needle (4) includes a long needle (401) and a short needle (402). The long needle (401) passes through the first protrusion (502) and the second protrusion (2408) and can exit from the needle outlet (2402) to pierce the skin. The short needle (402) can pierce the rubber sleeve (23) and connect the drug capsule (16) with the skin.

10. The patch-type infusion pump according to claim 9, characterized in that, Includes a first retaining ring (1), which engages with the button (3), and the first housing (2) is also provided with a display window (202) and a buckle (203). The display window (202) has a scale on one side, and the second housing (24) is provided with a second slot (2406), which is connected to the buckle (203). The bottom of the second housing (24) is provided with a support structure (2401) and an applicator (25). The support structure (2401) is a protrusion, and at least three of them are provided.

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