Electronic subcutaneous injection pump

Abstract

The electronic subcutaneous injection pump comprises a main body assembly, a driving unit, a screw rod and a screw nut arranged in the main body assembly, the main body assembly is provided with a medicine container mounting position, the screw nut is sleeved on the screw rod and is in threaded cooperation with the screw rod, the driving unit drives the screw nut to rotate and then drives the screw rod to extend and retract in the medicine container mounting position; the screw rod comprises a plurality of linear screw rod segments and a deformable connecting body, and the deformable connecting body is connected between any two adjacent linear screw rod segments; under the deformation capacity of the deformable connecting body, the two adjacent linear screw rod segments are relatively movable and are in one of a straight line state and a broken line state, and the two linear screw rod segments in the straight line state abut against each other to tend to keep the straight line state. The electronic subcutaneous injection pump eliminates the design hindrance of the length of the screw rod to the length of the compressed product, and is beneficial to the small size of the product.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and specifically to an electronic subcutaneous injection pump that is compact in size. Background Technology

[0002] Existing electronic hypodermic injection pumps include a main assembly and, within the main assembly, a motor, a reduction gear set, a lead screw and nut assembly, and a lead screw itself. The input wheel of the reduction gear set is connected to the output shaft of the motor, and the output wheel of the reduction gear set drives the lead screw and nut assembly to rotate. The lead screw and nut assembly is fitted onto the lead screw and threadedly engages with it. When the drug syringe is installed in its mounting position, the end of the lead screw aligns with the piston of the drug syringe. When the user presses the operation button, the motor starts working, driving the lead screw and nut assembly to rotate. With the threaded engagement between the lead screw and the lead screw and nut assembly, the lead screw and piston are pushed forward, thereby pumping out the drug from the drug syringe.

[0003] The problem with existing electronic subcutaneous injection pumps is that the length of the lead screw must meet the piston stroke of the drug syringe. The long lead screw makes it difficult to further compress the length of the electronic subcutaneous injection pump, thus preventing further miniaturization. Summary of the Invention

[0004] The purpose of this invention is to provide an electronic hypodermal injection pump that eliminates the design hindrance of lead screw length to the length of compressed products, thereby facilitating product miniaturization.

[0005] The electronic subcutaneous injection pump provided by this invention includes a main body assembly and a drive unit, a lead screw, and a lead screw nut assembly disposed in the main body assembly. The main body assembly has a drug container mounting position. The lead screw nut is fitted onto the lead screw, and the two are threaded together. The drive unit drives the lead screw nut assembly to rotate, thereby driving the lead screw to extend and retract within the drug container mounting position. The lead screw includes multiple straight lead screw segments and a deformable connector. Any two adjacent straight lead screw segments are connected by a deformable connector. Under the deformation capability of the deformable connector, two adjacent straight lead screw segments can move relative to each other and are in one of a straight state or a broken line state. Two straight lead screw segments in the straight state abut against each other to tend to maintain a straight state.

[0006] As can be seen from the above solution, the main difference lies in the fact that this invention improves the originally rigid, straight lead screw into a flexible and deformable structure. The parts of the lead screw that do not require operation can be bent or straight, perpendicular to the drug container mounting position, while the parts that require force application remain straight within the drug container mounting position. Adjacent straight lead screw segments are connected to each other to maintain a straight line and provide sufficient thrust. This design eliminates the design obstacle of the straight lead screw length on the length of the compressed product, facilitating the reduction of the length of the electronic subcutaneous injection pump and promoting product miniaturization.

[0007] A further approach is to have multiple deformable connectors located on the same side of the centerline of the lead screw.

[0008] As can be seen from the above, this setting allows any straight lead screw segment to bend towards the same side relative to the next straight lead screw segment. With the same total lead screw length, this setting can achieve a greater length reduction, which is beneficial for reducing the length of the injection pump.

[0009] A further embodiment is that multiple deformable connectors are located on the first side of the centerline of the lead screw; at least one extended end of the straight lead screw segment is provided with an abutment protrusion, and multiple abutment protrusions are located on the second side of the centerline of the lead screw; between two straight lead screw segments in a straight state, the abutment protrusion of one straight lead screw segment abuts against the other straight lead screw segment.

[0010] As can be seen from the above, the centerline of the lead screw is the line connecting the centerlines of multiple straight lead screw segments. With this configuration, when the lead screw pushes the piston, the second sides of adjacent straight lead screw segments reliably abut against each other through the abutting protrusions. The variable connecting body on the first side is also a structure that can withstand pressure. With this configuration, good thrust is provided on both sides of the centerline, ensuring that the lead screw works stably, reliably, and continuously.

[0011] A further proposed solution is that the lead screw and nut assembly has a screw hole; the main structure has a lead screw channel, which includes a straight channel section and a curved channel section. The extension direction of the straight channel section is perpendicular to the extension direction of the drug container mounting position, and the straight channel section, the curved channel section and the screw hole are connected in sequence.

[0012] As can be seen from the above, under this configuration, except for the straight lead screw segment in the drug container mounting position and the lead screw nut component that needs to extend in a straight line along the length direction of the drug container mounting position and occupy a certain length, and except for the length that must be occupied by the lead screw turning, the remaining straight lead screw segments extend in a direction perpendicular to the length direction of the drug container mounting position without increasing the length of the injection pump. Under this configuration, the length of the injection pump is further compressed.

[0013] A further proposed solution is that the main component includes a bending guide structure that guides the bending of the lead screw, and the bending guide structure is located on the outside of the bending channel section.

[0014] As can be seen from the above, this setting allows the linear lead screw segment to enter the lead screw nut assembly more smoothly, ensuring smooth transmission.

[0015] Another further option is to integrally injection mold at least two linear lead screw segments and a deformable connector between them, with the deformable connector being a flexible body.

[0016] As can be seen from the above, under this setting, the relatively complex lead screw is easy to form, while the flexible deformable variant is formed by plastic molding, which reduces the difficulty of production, reduces the production cost, reduces the number of parts, and eliminates cumbersome assembly processes.

[0017] Another further design includes a drive unit comprising a motor; the electronic hypodermal injection pump also includes a transmission assembly comprising an input worm gear, a gear set, and an output worm gear, with an output wheel toothed portion on the outer periphery of the lead screw and nut assembly; the motor drives the input worm gear to rotate, and the input worm gear, gear set, and output worm gear are sequentially driven, with the output worm gear meshing with the output wheel toothed portion.

[0018] As can be seen from the above, under this setting, the transmission mechanism has sufficiently good self-locking and anti-reverse effects.

[0019] Another further solution is to have a docking structure at the head of the first straight lead screw segment in the connection sequence, which is used to dock with the piston.

[0020] Another further option is that the electronic subcutaneous infusion pump also includes detachable consumables, including a drug container, an injection needle, and a patch; the drug container is placed in a drug container mounting position; the main component includes an end part with an opening, through which the needle at one end of the injection needle extends into the drug container mounting position and communicates with the drug container, and the needle at the other end of the injection needle is placed on the patch.

[0021] As can be seen from the above, in this configuration, the electronic subcutaneous infusion pump can also be configured with replaceable drug containers, injection needles, and patches as consumables.

[0022] A further approach is to separate the patch from the main component, with the injection needle flexibly connected between the main component and the patch; or, to fix the patch to the back side of the main component, with a recessed guide groove on the back side of the main component, and the injection needle placed in the guide groove.

[0023] As can be seen from the above, this electronic subcutaneous injection pump with a variable lead screw is suitable for different types of patch-type subcutaneous injections. Attached Figure Description

[0024] Figure 1 This is a structural diagram from a first perspective of the first embodiment of the electronic subcutaneous injection pump of the present invention.

[0025] Figure 2 This is a structural diagram from a second perspective of the first embodiment of the electronic subcutaneous injection pump of the present invention.

[0026] Figure 3 This is a cross-sectional view of the first embodiment of the electronic subcutaneous injection pump of the present invention.

[0027] Figure 4This is a structural diagram of the first embodiment of the electronic subcutaneous injection pump of the present invention, showing the hidden main components.

[0028] Figure 5 This is a schematic diagram illustrating the deformation principle of the lead screw in the first embodiment of the electronic subcutaneous injection pump of the present invention.

[0029] Figure 6 This is a structural diagram of the hidden patch in the first embodiment of the electronic subcutaneous injection pump of the present invention.

[0030] Figure 7 This is a structural diagram of a second embodiment of the electronic subcutaneous injection pump of the present invention.

[0031] Figure 8 This is a cross-sectional view of a second embodiment of the electronic subcutaneous injection pump of the present invention. Detailed Implementation

[0032] First embodiment of electronic subcutaneous infusion pump See Figure 1 and Figure 2 The electronic subcutaneous injection pump of this embodiment includes a main body component 1 and detachable consumables, including a drug container, an injection needle, and a patch 81. In this embodiment, the drug container is a drug injection cartridge. The upper surface 81a of the patch 81 is fixed to the back side of the main body component 1. One end of the injection needle is inserted into the main body component 1, while the other end of the needle 822 is disposed on the lower surface 81b of the patch 81.

[0033] See Figure 3 and Figure 4 The electronic subcutaneous injection pump includes a drive unit, a lead screw 4, and a lead screw nut 3 disposed in the main body assembly 1. The main body assembly 1 is provided with a drug container mounting position 100. The lead screw nut 3 is fitted on the lead screw 4 and the two are threaded together. The drive unit drives the lead screw nut 3 to rotate, which in turn drives the lead screw 4 to extend and retract within the drug container mounting position 100, thereby enabling the lead screw 4 to push the piston 92 of the drug injection cartridge 9 placed in the drug container mounting position 100.

[0034] Mainly, this invention solves the problem that the length of electronic subcutaneous injection pumps is difficult to further compress due to the long lead screw, and thus the electronic subcutaneous injection pump cannot be further miniaturized, by improving the conventional straight and rigid lead screw into a flexible and deformable structure.

[0035] See Figures 3 to 5 In this embodiment, the lead screw 4 includes multiple straight lead screw segments 41 and deformable connectors 42. Any two adjacent straight lead screw segments 41 are connected by a deformable connector 42. Under the deformation capability of the deformable connector 42, the two adjacent straight lead screw segments 41 can move relative to each other and be in one of a straight line state or a broken line state. Figure 5The state diagram in section a shows the straight line state mentioned above, and the state diagram in section b shows the broken line state mentioned above.

[0036] In this embodiment, all deformable connectors 42 are located on the same side of the centerline L of the lead screw 4. The centerline L is the line connecting the centerlines of the multiple straight lead screw segments 41, such as... Figure 5 As shown in state diagram a, when two or more straight lead screw segments 41 are connected in a straight line, then the center line L formed is a straight line; as shown in the diagram. Figure 5 As shown in the state diagram of b, when two or more straight lead screw segments 41 are connected to form a broken line, the center line L formed is a broken line.

[0037] The two extended ends of the linear lead screw segment 41 are provided with abutting protrusions 43, and the plurality of abutting protrusions 433 are all located on the second side of the center line L of the lead screw 4; between two linear lead screw segments 41 in a straight state, the abutting protrusion 43 of one linear lead screw segment 41 abuts against the abutting protrusion 43 of the other linear lead screw segment 41. This arrangement makes the two linear lead screw segments 41 in a straight state abut against each other to tend to maintain a straight state.

[0038] Comparison Figure 5 In state diagrams a and b, multiple deformable connectors 42 are arranged on the same side of the centerline L. This arrangement allows any one of the straight lead screw segments 41 to bend relative to the next straight lead screw segment 41 towards the same side, thereby forming a shape such as... Figure 3 The "L"-shaped bend shown allows for a greater reduction in length while maintaining the same total length of the lead screw 4, further facilitating the reduction of the injection pump length.

[0039] Furthermore, the centerline L of the lead screw 4 is a line connecting the centerlines L of multiple straight lead screw segments 41. With this configuration, when the lead screw 4 pushes the piston, the second sides of adjacent straight lead screw segments 41 are reliably abutted against each other by the abutting protrusion 43, while the variable connecting body 42 on the first side is also a structure capable of withstanding pressure. With this configuration, good thrust is provided on both the left and right sides of the centerline L, ensuring that the lead screw works stably, reliably and continuously.

[0040] In addition, in this embodiment, the lead screw 4 is integrally injection molded, that is, at least two straight lead screw segments 41 and the deformable connector 42 connecting the two are integrally injection molded. Furthermore, the deformable connector 42 is a flexible body. This arrangement makes the relatively complex lead screw 4 easy to mold while utilizing plastic to create a flexible deformable variant 42, reducing production difficulty, production costs, the number of parts, and eliminating cumbersome assembly processes. Additionally, naturally, the first straight lead screw segment 41 in the connection sequence on the lead screw 4 is provided with a docking structure 42, which is used for docking with the piston.

[0041] See Figure 3 and Figure 4 In terms of transmission, the drive unit includes a motor 21; the electronic hypodermal injection pump also includes a transmission assembly 22, which includes an input worm gear 221, a gear set, and an output worm gear 224. The gear set includes a first gear 222 and a second gear 223. The first gear 222 includes a first tooth portion 2221 and a second tooth portion 2222. The output worm gear 224 includes a third tooth portion (not shown) and a worm portion. The outer periphery of the lead screw nut 3 is provided with an output wheel tooth portion 31. The lead screw nut 3 is connected at both ends by bearings to be stably and rotatably mounted in the main body assembly 1. The motor 21 drives the input worm gear 221 to rotate. The input worm gear 221 meshes with the first tooth 2221 of the first gear 222, the second tooth 2222 meshes with the second gear 223, the second gear 223 meshes with the third tooth of the output worm gear 224, and the worm part of the output worm gear 224 meshes with the output gear tooth 31. This realizes the sequential transmission of the motor 21, the input worm gear 221, the gear set, the output worm gear 224, and the lead screw nut 3, which drives the lead screw nut 3 to rotate and then drives the lead screw 4 to move forward or backward.

[0042] See also Figure 3 and Figure 4 For the bendable and deformable lead screw 4, the main body component 1 also needs to be provided with corresponding channels and guide structures. Specifically, in this embodiment, the lead screw nut component 3 is provided with a screw hole 30; the main body structure is provided with a lead screw channel 110, which includes a straight channel portion 1101 and a curved channel portion 1102. The extension direction of the straight channel portion 1101 is perpendicular to the extension direction of the drug container mounting position 100, and the straight channel portion 1101 and the curved channel portion 1102 are sequentially connected to the screw hole 30. Figure 3 As shown, except for the linear lead screw segment 41 in the drug container mounting position 100 and the lead screw nut component 3, which needs to extend in a straight line along the length direction of the drug container mounting position 100 and thus occupies a certain length, and excluding the length required for lead screw turning, the remaining linear lead screw segments 41 extend in the linear channel portion 1101 in a direction perpendicular to the length direction of the drug container mounting position 100 without increasing the length of the injection pump. Figure 3 and Figure 4 The dashed line shows a portion of the linear lead screw section 41 located in the linear channel section 1101 after the lead screw 4 has retracted to its limit position.

[0043] See Figure 1 and Figure 3The main body component 1 includes a housing 12, the side wall of which serves as a side baffle of the straight channel portion 1101 and guides the lead screw 4. In addition, the main body component 1 also includes a bending guide structure 13 that guides the bending of the lead screw 4. The bending guide structure 13 is a baffle structure provided on the outside of the bending channel portion 1102. The baffle structure can be provided on the housing 12 or on other inner and outer housing structures.

[0044] See Figure 3 and Figure 4 More importantly, when the lead screw 4 is configured as multiple bendable straight lead screw segments 41, when entering and exiting the threaded hole 30 of the lead screw nut 3, the straight lead screw segments 41 preparing to enter the threaded hole 30 may not be completely parallel to the through direction of the threaded hole 30. Specifically, when the lead screw 4 advances (pushes the piston), the straight lead screw segments 41 in the curved channel portion 1102 may not be completely parallel to the through direction of the threaded hole 30. Furthermore, when the lead screw 4 retracts, the front part of the lead screw 4 loses the piston's force and relaxes, and the straight lead screw segments 41 retracting from the drug container mounting position 100 and preparing to enter the threaded hole 30 may not be completely parallel to the through direction of the threaded hole 30. In this case, it will affect the smooth entry of the straight lead screw segments 41 into the threaded hole 30.

[0045] Therefore, in this embodiment, the main component 1 also has guide structures at both the front and rear of the screw hole 30 of the lead screw nut 3. The guide structures mainly include two structures 15 located on opposite sides of the centerline of the screw hole 30. Each structure 15 has an arc surface 151, forming a converging entrance between the two arc surfaces 151 of the two opposing structures 15 on either side of the centerline of the screw hole 30. This guides the straight lead screw segment 41, ensuring that the straight lead screw segment 41 before entering the screw hole 30 is substantially parallel to the penetration direction of the screw hole 30. In this embodiment, the above-mentioned guide structure is integrated into the bearing housing of the bearing of the lead screw nut 3. Furthermore, the bearing housing is integrated into the fixing frame of the gear set. This configuration simplifies the product structure.

[0046] See Figure 1 , Figure 3 and Figure 6 In this embodiment, the main component 1 also includes an end part 14, which has an opening 140. The needle 821 at one end of the injection needle tube 82 extends into the drug container mounting position 100 through the opening 140 and pierces the outlet of the drug injection cartridge 9. Figure 6As shown, a recessed guide groove is provided on the back side of the main body component 1. The guide groove includes a first guide groove portion 1410 provided on the end component 14 and a second guide groove portion 1420 provided on the back side of the housing. The injection needle tube 82 is bent and disposed in the guide groove. The outlet of the second guide groove portion 1420 is opposite to the patch 81. The needle tip 822 at the other end of the injection needle tube 82 passes through the patch 81 from the outlet of the second guide groove portion 1420 and extends beyond the lower surface 81b of the patch 81. In this embodiment, the end component 14 is a detachable housing structure, and the drug container mounting position 100 is formed in the end component 14.

[0047] Mainly, this invention improves the originally straight, rigid lead screw into a flexible and deformable structure. The parts of the lead screw that do not require operation can be bent or straight, perpendicular to the drug container mounting position 100, while the parts that require force application remain straight within the drug container mounting position 100. Adjacent straight lead screw segments 41 are connected to each other to maintain a straight state and provide sufficient thrust. This configuration eliminates the design obstacle of the straight lead screw length on the length of the compressed product, facilitating the reduction of the length of the electronic subcutaneous injection pump and promoting product miniaturization.

[0048] Second embodiment of electronic subcutaneous infusion pump See Figure 7 and Figure 8 In this embodiment, the patch 83 is separate from the main body component 3, and the injection needle tube 84 is flexibly connected between the main body component 3 and the patch 83. In this embodiment, the drug container mounting position 300 is presented in the main housing component of the main body component 3, and the end component 34 is a sealing member that blocks the mounting inlet of the drug container mounting position 300.

[0049] In other embodiments, the electronic subcutaneous infusion pump does not include consumables such as drug containers, injection needles, and patches, and this embodiment is also within the scope of protection of the present invention.

[0050] Finally, it should be emphasized that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An electronic subcutaneous injection pump, comprising a main body assembly and a drive unit, a lead screw, and a lead screw nut assembly disposed in the main body assembly, wherein the main body assembly has a drug container mounting position, the lead screw nut assembly is fitted on the lead screw and the two are threadedly engaged, and the drive unit drives the lead screw nut assembly to rotate, thereby driving the lead screw to extend and retract within the drug container mounting position; Its features are: The lead screw includes multiple straight lead screw segments and a deformable connecting body, and the deformable connecting body connects any two adjacent straight lead screw segments. Under the deformation capability of the deformable connector, two adjacent straight lead screw segments can move relative to each other and be in one of a straight state or a broken line state, and the two straight lead screw segments in the straight state abut against each other to tend to maintain the straight state.

2. The electronic subcutaneous infusion pump according to claim 1, characterized in that: All of the deformable connectors are located on the same side of the centerline of the lead screw.

3. The electronic subcutaneous infusion pump according to claim 2, characterized in that: All of the aforementioned deformable connectors are located on the first side of the centerline of the lead screw; At least one extended end of the linear lead screw segment is provided with an abutting protrusion, and the plurality of abutting protrusions are all located on the second side of the centerline of the lead screw. Between the two linear lead screw segments in the aforementioned straight state, the abutting protrusion of one linear lead screw segment abuts against the other linear lead screw segment.

4. The electronic subcutaneous infusion pump according to claim 3, characterized in that: The lead screw nut component is provided with a screw hole; The main structure is provided with a lead screw channel, which includes a straight channel section and a curved channel section. The extension direction of the straight channel section is perpendicular to the extension direction of the drug container mounting position. The straight channel section and the curved channel section are connected to the screw hole in sequence.

5. The electronic subcutaneous infusion pump according to claim 4, characterized in that: The main component includes a bending guide structure that guides the bending change of the lead screw, and the bending guide structure is disposed on the outside of the bending channel portion.

6. The electronic subcutaneous infusion pump according to claim 1, characterized in that: At least two of the aforementioned linear lead screw segments and the deformable connector connecting them are integrally injection molded, and the deformable connector is a flexible body.

7. The electronic subcutaneous infusion pump according to any one of claims 1 to 6, characterized in that: The drive unit includes a motor; The electronic subcutaneous injection pump also includes a transmission assembly, which includes an input worm gear, a gear set, and an output worm gear. The outer periphery of the lead screw and nut is provided with an output gear tooth. The motor drives the input worm gear to rotate, and the input worm gear, the gear set and the output worm gear are driven in sequence. The output worm gear meshes with the teeth of the output wheel.

8. The electronic subcutaneous infusion pump according to any one of claims 1 to 6, characterized in that: The first linear lead screw segment in the connection sequence is provided with a docking structure, which is used to dock with the piston.

9. The electronic subcutaneous infusion pump according to any one of claims 1 to 6, characterized in that: The electronic subcutaneous injection pump also includes detachable consumables, including a drug container, an injection needle, and a patch. The drug container is positioned in the drug container mounting location; The main component includes an end part with an opening. The needle at one end of the injection needle tube extends into the drug container mounting position through the opening and communicates with the drug container. The needle at the other end of the injection needle tube is mounted on a patch.

10. The electronic subcutaneous infusion pump according to claim 9, characterized in that: The patch is separate from the main component, and the injection needle is flexibly connected between the main component and the patch; or, The patch is fixed to the back side of the main body component, and a recessed guide groove is provided on the back side of the main body component, with the injection needle disposed in the guide groove.

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