Elastic anti-reversal drug infusion device

Abstract

The present invention discloses an elastic anti-reversal drug infusion device, comprising: an infusion structure, comprising: a drug storage cartridge for accommodating the drug to be infused, with a screw and a piston connected to the screw arranged inside; a driving wheel assembly comprising a driving wheel, a driving tube and a cover, and at least one elastic member is also arranged on the cover, abutting against the driving wheel assembly; a driving unit with a driving end, the driving end drives the driving wheel to rotate; a power component and a reset component connected to the driving unit; a control structure, the control structure is electrically connected to the infusion structure, and the control structure controls the power component to apply a force to the driving unit; and an adhesive patch for the infusion structure and the control structure to be attached to the skin surface. The elastic member can provide a variable elastic friction force within a certain range to better prevent the driving wheel from reversing, and the elastic member is arranged on the driving wheel cover, which can make full use of the internal space of the infusion device, and can also assist the driving wheel cover to elastically fix the driving wheel, thereby enhancing the user experience.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefits of and priority to the following patent application: PCT patent application filed on September 10, 2021, with application number PCT / CN2021 / 117730. Technical Field

[0003] The invention mainly relates to the field of medical devices, and in particular to an elastic anti-reversal drug infusion device. Background Art

[0004] A drug infusion device is a medical device that continuously injects drugs into the patient's body to achieve the purpose of disease treatment. Drug infusion devices are widely used in the treatment of diabetes. They continuously infuse insulin into the patient's subcutaneous tissue according to the dosage required by the human body to simulate the secretion function of the pancreas and maintain the patient's blood sugar stability. The drug fluid is usually stored inside the infusion pump body. Existing drug infusion devices usually stick the pump body directly to the patient's body with medical tape, and the patient operates the remote device for infusion.

[0005] At present, in an infusion device that completes drug infusion by driving a gear to rotate with a single ratchet, an additional fixed ratchet for preventing reverse rotation is usually required, or two ratchets arranged opposite to each other are used in combination, or an additional friction component is used to provide friction for preventing reverse rotation. In this case, an additional ratchet or friction component needs to be provided in the infusion device, and there are many components, so the design is relatively complicated, the space utilization rate inside the infusion device is low, and the device cannot play the role of elastic anti-reversal.

[0006] Therefore, the prior art urgently needs a drug infusion device with a simple structure, high space utilization and elastic anti-reversal function. Summary of the invention

[0007] The present invention discloses an elastic anti-reversal drug infusion device. At least one elastic member is arranged on the driving wheel cover of the infusion structure, which abuts against the driving wheel assembly. The elastic member can provide a variable elastic friction force within a certain range to better prevent the driving wheel from reversing. The elastic member is arranged on the driving wheel cover and does not require other components to carry it. The internal space of the infusion device is fully utilized, the compactness of the internal design is increased, and the driving wheel cover can be assisted to elastically fix the driving wheel, thereby enhancing the user experience.

[0008] The present invention discloses an elastic anti-reversal drug infusion device, comprising: an infusion structure, the infusion structure comprising: a drug storage cylinder, which is used to accommodate the drug to be infused and is provided with a screw and a piston connected to the screw; a driving wheel assembly, which comprises a driving wheel, a driving tube and a cover, the cover is used to fix the driving wheel, and the cover is also provided with at least one elastic member, which abuts against the driving wheel assembly; a driving unit with a driving end, the driving end drives the driving wheel to rotate; a power component and a reset component connected to the driving unit, the power component applies a force to the driving unit to make the driving wheel move forward, and the reset component applies a force to the driving unit to reset the driving end; a control structure, the control structure is electrically connected to the infusion structure, and the control structure controls the power component to apply a force to the driving unit; and an adhesive patch, which is used to stick the infusion structure and the control structure to the skin surface.

[0009] According to one aspect of the present invention, the elastic member is one of a compression spring, a tension spring and a torsion spring.

[0010] According to one aspect of the present invention, a cylindrical component is provided at the end of the cover for sleeve-engaging the elastic member.

[0011] According to one aspect of the present invention, at least one end of the elastic member abuts against the driving tube.

[0012] According to one aspect of the present invention, the elastic member is an elastic rod.

[0013] According to one aspect of the present invention, a groove is provided on the top of the cover for accommodating the elastic rod.

[0014] According to one aspect of the invention, the elastic rod abuts against a side surface of the drive tube and / or the drive wheel.

[0015] According to one aspect of the present invention, the infusion device further comprises a main frame for supporting the components of the infusion structure, the cover is provided with a plurality of cover engaging portions, and the main frame is provided with a plurality of main frame engaging portions engaging with the plurality of cover engaging portions.

[0016] According to one aspect of the present invention, the elastic member is disposed on at least one cover engaging portion.

[0017] According to one aspect of the present invention, the elastic member is one or more of silicone, rubber, latex, and spring steel.

[0018] According to one aspect of the present invention, the cover engaging portion and the elastic member are an integral structure.

[0019] According to one aspect of the present invention, the reset component and the elastic member are the same component.

[0020] According to one aspect of the present invention, the control structure and the infusion structure are separate structures, and the control unit is reusable.

[0021] According to one aspect of the present invention, the control structure and the infusion structure are an integrated structure and are disposed of as a whole after use.

[0022] According to one aspect of the present invention, the adhesive patch includes an adhesive tape and a protective film, and the surface of the adhesive tape is provided with densely arranged air permeable holes evenly arranged.

[0023] Compared with the prior art, the technical solution of the present invention has the following advantages:

[0024] In the elastic anti-reversal drug infusion device disclosed in the present invention, at least one elastic member is arranged on the driving wheel cover of the infusion structure, which abuts against the driving wheel assembly. By applying pressure to the driving wheel assembly, the static friction force on the driving wheel can be increased to prevent the driving wheel from reversing. The elastic member can provide variable elastic friction within a certain range, which can better prevent the driving wheel from reversing, improve the accuracy of drug infusion, and eliminate safety hazards. In addition, the elastic member is arranged on the driving wheel cover to fully utilize the internal space, effectively reduce the volume of the infusion device, and assist the driving wheel cover to elastically fix the driving wheel, thereby enhancing the user experience.

[0025] Furthermore, the elastic member is a torsion spring, which can provide elastic force in a larger range. At least one end of the torsion spring abuts against the drive tube, and the abutment position of the other end can be selected according to actual needs, thereby better elastically fixing the drive wheel and preventing the drive wheel from reversing.

[0026] Furthermore, the elastic member is one or more of a compression spring, a tension spring, a torsion spring, a U-shaped elastic rod, an L-shaped elastic rod, silicone, rubber, latex, and spring steel. The type, quantity, position, and layout of the elastic member, such as the abutment method with the drive tube or the drive wheel, can be selected according to actual needs. It is flexible and diverse, and can make full use of the internal space of the infusion device and effectively reduce the volume of the infusion device.

[0027] Furthermore, the elastic member and the cover engaging portion are an integrated structure and are symmetrically distributed on both sides of the drive tube, which can provide a stable elastic friction force range to prevent the drive wheel from reversing, and can also elastically fix the ratchet, further reducing the number of components and the size of the infusion device.

[0028] Furthermore, the elastic member and the reset member are the same member, which can not only provide elastic force to reset the driving end, but also provide elastic friction to prevent the driving wheel from reversing. At the same time, it can assist the driving wheel cover to elastically fix the driving wheel, further reducing the number of components and reducing the size of the infusion device.

[0029] Furthermore, the adhesive patch includes adhesive tape and a protective film. The surface of the adhesive tape is provided with densely arranged air holes, which makes the adhesive tape breathable and can help the water vapor and sweat secreted by the patient's skin at the adhesion site to be discharged, thereby preventing the water vapor and sweat from soaking the skin and causing wrinkles on the patient's skin. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1a-1b are top views of drug infusion systems according to two different embodiments of the present invention;

[0031] Figure 2a-2b is a schematic diagram of a three-dimensional structure of a control structure according to an embodiment of the present invention;

[0032] Figure 3a is a schematic diagram of the three-dimensional structure of an infusion structure according to an embodiment of the present invention;

[0033] Figure 3b A side view of a control structure and an infusion structure assembled with each other according to one embodiment of the present invention;

[0034] Figure 3c It is a schematic diagram of a top view of the lower shell of the infusion structure part according to one embodiment of the present invention;

[0035] Figure 3d is a schematic diagram of a top view of the lower shell of the infusion structure part according to another embodiment of the present invention;

[0036] Figure 4a-4b They are three-dimensional structural schematic diagrams of the internal structure of an infusion structure according to one embodiment of the present invention from two perspectives;

[0037] Figure 4c is a three-dimensional structural schematic diagram of the internal structure of an infusion structure according to another embodiment of the present invention;

[0038] Figure 5 is a schematic diagram of a three-dimensional structure of an elastic conductor according to an embodiment of the present invention;

[0039] Figure 6 is a schematic diagram of a three-dimensional structure of a conductive spring according to an embodiment of the present invention;

[0040] Figure 7 for Figure 4a A local magnified view of the M region;

[0041] Figure 8a and Figure 8b They are schematic structural diagrams of the driving wheel assembly and the main frame 17 before and after assembly according to an embodiment of the present invention;

[0042] Figure 8c is a schematic diagram of a three-dimensional structure of a cover according to an embodiment of the present invention;

[0043] Figure 9a-9d Schematic diagram of the cross-section structure and the schematic diagram of the three-dimensional structure of the movable block in the embodiment of the present invention when they are in the open and closed states respectively;

[0044] Figure 10a-Figure 10c Schematic diagram of the structure of the elastic member and the driving wheel assembly according to different embodiments of the present invention;

[0045] Fig.10d for Fig.10b A local magnified view of the N region. DETAILED DESCRIPTION

[0046] As mentioned above, in the prior art, a single ratchet drives the gear to rotate to complete drug infusion. Additional ratchets or friction components are required to prevent the driving wheel from reversing. There are many components and the design is relatively complex. The space utilization rate inside the infusion device is low, and it cannot play the role of elastic anti-reversal.

[0047] In order to solve this problem, the present invention provides a drug infusion device, wherein at least one elastic member is arranged on the driving wheel cover of the infusion structure, abutting against the driving wheel assembly. The elastic member can provide variable elastic friction within a certain range to better prevent the driving wheel from reversing. The elastic member is arranged on the driving wheel cover and does not require other components to carry it. The internal space of the infusion device is fully utilized, the compactness of the internal design is increased, and the driving wheel cover can also assist the driving wheel cover to elastically fix the driving wheel, thereby enhancing the user experience.

[0048] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be understood that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments should not be construed as limiting the scope of the present invention unless otherwise specifically stated.

[0049] In addition, it should be understood that for ease of description, the sizes of the various components shown in the drawings are not necessarily drawn according to actual proportions. For example, the thickness, width, length or distance of certain units may be enlarged relative to other structures.

[0050] The following description of the exemplary embodiments is merely illustrative and is not intended to limit the present invention and its application or use in any sense. Techniques, methods and devices known to ordinary technicians in the relevant field may not be discussed in detail here, but where applicable, these techniques, methods and devices should be considered as part of this specification.

[0051] It should be noted that like reference numerals and letters denote similar items in the following figures, and thus, once an item is defined or described in one figure, it will not require further discussion in the subsequent figure descriptions.

[0052] Figure 1a-1b 1 and 2 are top views of drug infusion devices according to two different embodiments of the present invention.

[0053] The patch-type drug infusion device of the embodiment of the present invention comprises: control structure 100, infusion structure 110 and adhesive patch 120. These structures will be described separately below. In other embodiments of the present invention, the patch-type drug infusion device can also include more parts, which are not specifically limited here.

[0054] The patch-type drug infusion device refers to an infusion device that does not contain a long catheter, and the infusion device is adhered to the user's skin surface as a whole by the same adhesive patch 120, and the drug is infused directly from the drug storage cartridge 131 along the infusion needle to the subcutaneous tissue by the infusion needle unit 121 in the device.

[0055] In the embodiment of the present invention, the control structure 100 and the infusion structure 110 are of split design, and the two are connected by a waterproof plug or directly snapped and electrically connected to form a whole. When the control structure 100 and the infusion structure 110 are directly snapped and electrically connected to form a whole, the reliability of the electrical connection can be improved, which will be described in detail below. The control structure 100 can be reused, and the infusion structure 110 can be discarded after a single use, such as Figure 1a In another embodiment of the present invention, the infusion structure 110 and the control structure 100 are of an integrated design, connected by a wire, arranged inside the same housing 10, and attached to a certain position of the user's skin through an adhesive patch 120, and are discarded as a whole after a single use, as shown in FIG. Figure 1b shown.

[0056] The patch-type drug infusion device of an embodiment of the present invention includes a control structure 100. The control structure 100 is used to receive signals or information from a remote device or a body fluid parameter detection device (such as a continuous blood glucose detection device), and then control the infusion device to complete drug infusion. The housing 101 of the control structure 100 is provided with a program module, a circuit board and related electronic components for receiving signals or issuing control instructions, as well as other physical components or structures necessary to realize the infusion function, which are not specifically limited here. In some embodiments of the present invention, a power supply is also provided in the control structure. In an embodiment of the present invention, the power supply 133 is provided in the infusion structure 110, as described below.

[0057] Figure 2a-2b Schematic diagram of the three-dimensional structure of the control structure 100 according to an embodiment of the present invention.

[0058] The control structure 100 also includes a plurality of first electrical contacts 103 exposed on the surface of the control structure 100. The first electrical contacts 103 are used as circuit connection terminals to electrically connect the internal circuits provided on the control structure 100 and the infusion structure 110, respectively. The embodiment of the present invention does not impose any specific restrictions on the position where the first electrical contacts 103 are provided. Compared with the connection terminals provided as connectors, the contact area of ​​the electrical contacts is smaller, and the design can be flexible, which effectively reduces the volume of the control structure. At the same time, the electrical contacts can be directly electrically connected to the internal circuits or electrical components, or can be directly soldered on the circuit board, which optimizes the design of the internal circuits, effectively reduces the complexity of the circuits, saves costs, and reduces the volume of the infusion device. Furthermore, the electrical contacts are exposed on the surface of the control structure 100, which can facilitate electrical connection with the connection terminals on other structures. The above technical advantages of the electrical contacts are applicable to the first electrical contacts 103 on the control structure 100 and the second electrical contacts 113 on the infusion structure 110, which will not be described in detail below.

[0059] The first electrical contact 103 may be a rigid metal contact or an elastic conductive member. Preferably, in the embodiment of the present invention, the first electrical contact 103 is a rigid metal contact. One end of the first electrical contact 103 is electrically connected to a connection end disposed inside the control structure 100, and the other end is exposed to the surface of the housing 101, and the rest of the first electrical contact 103 is tightly embedded in the housing 101 to isolate the interior of the control structure 100 from the outside.

[0060] Here, the elastic conductive member includes a conductive spring, conductive silicone, conductive rubber or conductive shrapnel, etc. Obviously, one end of the elastic conductive member is used to be electrically connected to the connection end inside the control structure 100, and the other end is used to be electrically connected to other connection ends. As in one embodiment of the present invention, the first electrical contact 103 is a conductive spring. When the electrical contacts are in contact with each other, the elasticity of the conductive spring can enhance the reliability of the electrical connection. Similar to a rigid metal contact, except that one end is exposed to the surface of the housing 101, the other part of the conductive spring is tightly embedded in the housing 101 and is electrically connected to the internal circuit or electrical component. Obviously, the connection end located inside the control structure 100 can be a conductive lead, or it can be a specific part of a circuit or electrical component.

[0061] It should be noted that "tightly embedded" in the embodiment of the present invention means that there is no gap between the electrical contact and the housing 101, thereby achieving sealing of the interior of the control structure 100. The "tightly embedded" hereinafter has the same meaning as here.

[0062] In another embodiment of the present invention, the first electrical contact 103 is a conductive spring, but is not tightly embedded in the housing 101. Instead, a seal is provided around the area where the first electrical contact 103 is provided. The seal is provided in a groove to achieve sealing of the electrical connection position and the interior of the control structure 100.

[0063] In the embodiment of the present invention, the control structure 100 is further provided with a first engaging portion 102. The first engaging portion 102 is used to engage with the second engaging portion 112 of the infusion structure 110, so that the control structure 100 and the infusion structure 110 are assembled with each other, and the first electrical contact 103 is electrically connected with the second electrical contact 113, which will be described in detail below.

[0064] The first engaging portion 102 and the second engaging portion 112 include one or more of hooks, blocks, holes, and slots that can engage with each other, and their positions can be flexibly designed according to the shape structures of the control structure 100 and the infusion structure 110, such as being arranged inside or on the surface of the corresponding structure, and no specific restrictions are made here.

[0065] In the embodiment of the present invention, the control structure 100 is further provided with a recess 104 for assembling with the protrusion 114 at the bottom of the housing of the infusion structure 110, which will be described in detail below. Specifically, the first electrical contact 103 is provided in the recess 104, such as Figure 2b shown.

[0066] In the embodiment of the present invention, a buzzer (not shown) is also provided in the control structure 100. When the infusion starts or ends, the infusion device fails, the medicine is exhausted, the control structure 100 issues an erroneous instruction or receives an erroneous message, etc., the buzzer is used to send out an alarm signal such as sound or vibration, so that the user can be aware of it and make timely adjustments.

[0067] In the embodiment of the present invention, a sound-permeable hole 105 is provided on the housing 101 of the control structure 100 to facilitate the transmission of the sound alarm signal of the buzzer. In order to achieve a good sealing effect to ensure the normal operation of the buzzer, a waterproof sound-permeable membrane (not shown) is provided between the sound-permeable hole 105 and the buzzer. Therefore, the waterproof sound-permeable membrane needs to have a certain porosity to prevent water molecules from entering the buzzer while ensuring that the sound is transmitted.

[0068] Compared with the traditional technical solution of sealing the buzzer inside the control structure 100, after the sound-permeable hole 105 is provided, the buzzer can be perceived by the user with a relatively small sound, thereby reducing the energy consumption of the buzzer, optimizing the power consumption configuration of the infusion device, and saving production costs.

[0069] Figure 3a Schematic diagram of the three-dimensional structure of the infusion structure 110 according to an embodiment of the present invention. Figure 3b 1 is a side view of the control structure 100 and the infusion structure 110 assembled with each other according to an embodiment of the present invention. Figure 3c The figure is a schematic top view of the lower shell of the infusion structure part according to one embodiment of the present invention. Figure 3d This is a schematic top view of the lower shell of the infusion structure part of another embodiment of the present invention.

[0070] The patch-type drug infusion device also includes an infusion structure 110. The infusion module, circuit module and other auxiliary modules for completing drug infusion are arranged inside the housing, which will be described in detail below. The housing of the infusion structure 110 can include multiple parts. For example, in an embodiment of the present invention, the housing of the infusion device includes an upper housing 111a and a lower housing 111b.

[0071] As mentioned above, in the embodiment of the present invention, the infusion structure 110 is provided with a second engaging portion 112. The second engaging portion 112 is used to cooperate and engage with the first engaging portion 102. Therefore, the first engaging portion 102 and the second engaging portion 112 are provided at corresponding positions.

[0072] In an embodiment of the present invention, the infusion structure 110 is provided with a second electrical contact 113. The second electrical contact 113 is used to squeeze and contact with the corresponding first electrical contact 103 to achieve electrical connection between the control structure 100 and the infusion structure 110. The mutual squeezing between the two electrical contacts of different structures can improve the reliability of the electrical connection. Similar to the first electrical contact 103, the types of the second electrical contact 113 also include rigid metal contacts or elastic conductive parts. Specifically, in an embodiment of the present invention, the second electrical contact 113 is a conductive spring. Similarly, the conductive spring can improve the electrical connection performance. A groove is also provided around the area where the second electrical contact 113 is provided, and a sealing member 115 is provided in the groove.

[0073] Preferably, in the embodiment of the present invention, the diameters of the two ends of the conductive spring are different, the diameter exposed to the outside of the infusion structure 110 is shorter, and the diameter of the portion located inside the infusion structure 110 is longer. The longer diameter can block the conductive spring in the housing. Therefore, when the control structure 100 is not mounted on the infusion structure 110, the longer diameter can prevent the conductive spring from falling off the infusion structure 110.

[0074] The embodiment of the present invention does not limit the location of the second electrical contact 113, as long as it can be electrically connected to the corresponding first electrical contact 103. Specifically, in the embodiment of the present invention, the bottom of the upper shell 111a of the infusion structure 110 includes a protrusion 114. The second electrical contact 113 is disposed on the protrusion 114, such as Figure 3a The convex portion 114 corresponds to the concave portion 104 on the control structure 100, and the two can be assembled with each other, so that the first electrical contact 103 and the corresponding second electrical contact 113 are pressed against each other, thereby achieving electrical connection.

[0075] In other embodiments of the present invention, the protrusion 114 may be disposed on the lower shell 111b, or when the shell of the infusion structure 110 is an integral body, the protrusion 114 is a part of the integral shell, which is not specifically limited here.

[0076] The manner in which the control structure 100 and the infusion structure 110 are assembled to each other includes pressing the control structure 100 onto the infusion structure 110 along the thickness direction of the infusion structure 110 so that the first engaging portion 102 and the second engaging portion 112 engage with each other. Alternatively, the control structure 100 is pressed onto the infusion structure 110 along the length direction of the infusion structure 110. Alternatively, the control structure 100 is pressed along any angle between the thickness direction and the length direction of the infusion structure 110 so that the first engaging portion 102 and the second engaging portion 112 engage with each other. Preferably, in the implementation of the present invention, the manner in which the control structure 100 and the infusion structure 110 are assembled to each other includes pressing the control structure 100 onto the infusion structure 110 along the thickness direction of the infusion structure 110 so that the first engaging portion 102 and the second engaging portion 112 engage with each other, such as Figure 3b Installation direction shown.

[0077] In the embodiment of the present invention, the lower shell 111b of the infusion structure 110 includes an outward extension portion 116, and a blocking block 117 is disposed on the outer side of the extension portion 116. Figure 3a As described above, the control structure 100 is pressed to the engaging position along the thickness direction of the infusion structure 110, and the blocking block 117 can prevent the control structure 100 from falling off along the length direction of the infusion structure 110, thereby ensuring the normal operation of the infusion device. Obviously, in other embodiments of the present invention, if the control structure 100 is pressed to the engaging position along other directions, the position of the blocking block 117 can be adjusted to prevent the control structure 100 from falling off the infusion structure 110.

[0078] It should be noted that “outward” and “outside” are relative to the main part of the infusion structure 110 and are relative position concepts. Figure 3a or Figure 3b The “outside” in the following text has the same meaning as here.

[0079] In the embodiment of the present invention, a pressing portion 118 is further provided at the outer end of the extension portion 116, which is used to release the blocking effect of the blocking block 117. When the user replaces the infusion structure 110, the user presses the pressing portion 118 with a finger to release the blocking effect of the blocking block 117 on the control structure 100. The user removes the control structure 100 from the infusion structure 110 with two fingers.

[0080] The embodiment of the present invention may also be provided with an unlocking hole 119. The unlocking hole 119 is provided on the inner side of the blocking block 117. While pressing the pressing portion 118, the index finger can enter the unlocking hole 119, thereby ejecting the control structure 100, and separating the control structure 100 from the infusion structure 110. In the embodiment of the present invention, the unlocking hole 119 is square. The square unlocking hole 119 can facilitate smooth entry of a finger. In other embodiments of the present invention, the unlocking hole 119 may also be other shapes, which are not specifically limited here.

[0081] The lower shell 111b of the infusion structure 110 is also provided with a folding groove 140. The folding groove 140 is provided on both sides of the unlocking hole 119. Figure 3c and Figure 3d After the crease groove 140 is provided, the thickness or width of the lower shell 111b at the crease groove 140 position (eg Figure 3c and Figure 3d When the user presses the pressing portion 118, the lower shell 111b is easily broken at the crease groove 140, thereby more smoothly releasing the blocking block 117 from blocking the control structure 100.

[0082] Preferably, in the embodiment of the present invention, the fold groove 140 is disposed at both ends of the blocking block 117, such as Figure 3c In another embodiment of the present invention, the fold groove 140 is disposed on one side of two corresponding sides of the unlocking hole 119, as shown in FIG. Figure 3d shown.

[0083] The infusion structure 110 of the embodiment of the present invention is further provided with an infusion needle unit 121 for infusing the drug subcutaneously.

[0084] The bottom of the lower shell 111b of the infusion structure 110 is also provided with an adhesive patch 120 for sticking the infusion device on the user's skin surface. The adhesive patch includes an adhesive tape and a protective film. The surface of the adhesive tape is provided with densely arranged air holes evenly arranged, so that the adhesive tape has air permeability, which can help the water vapor and sweat secreted by the patient's skin at the contact part to be discharged, and prevent the water vapor and sweat from soaking the skin and causing wrinkles on the patient's skin.

[0085] Figure 4a-4b They are schematic three-dimensional structural diagrams of the internal structure 130 of the infusion structure 110 according to an embodiment of the present invention from two perspectives. Figure 4c FIG. 1 is a schematic three-dimensional structural diagram of an internal structure 130 of an infusion structure 110 according to another embodiment of the present invention.

[0086] In the embodiment of the present invention, the internal structure 130 includes a mechanical unit and an electric control unit for completing the infusion function, such as a drug storage cartridge 131, a drug outlet 132, a power source 133, a driving wheel 134, a screw 135, a circuit board (not shown), and a driving unit 1310, etc. The movement of the driving unit 1310 drives the driving wheel 134 to rotate, and then drives the screw 135 to push the piston (not shown) in the drug storage cartridge 131 to move, thereby achieving drug infusion.

[0087] In the embodiment of the present invention, the power source 133 is a conventional button battery. In other embodiments of the present invention, the power source 133 may also be other types of batteries, as long as they can meet the conditions for supplying power to the infusion device. Preferably, in the embodiment of the present invention, the power source 133 is a double-row battery, that is, two rows of batteries are respectively arranged on both sides of the driving wheel 134, such as Figure 4b As shown. Conventionally, the discharge capacity of button batteries is low. Providing double-row button batteries can reduce the discharge level of each battery and extend the battery life. Furthermore, the double-row design of the power supply 133 can fully utilize the internal space of the infusion device and improve the integration of the internal structure of the infusion device.

[0088] The infusion structure 110 in the embodiment of the present invention is also provided with a circuit board or a three-dimensional circuit coated on a part of the structural surface, which is used to supply power to a specific structural unit. According to the internal structural characteristics of the infusion device, the shape and position of the three-dimensional circuit can be flexibly designed, and the internal space of the infusion structure can be fully utilized to make the structure more compact. The circuit board is a rigid circuit board or a flexible circuit board. Preferably, in the embodiment of the present invention, the circuit board is a flexible circuit board. The flexible circuit board is plastic in shape, and its shape can be flexibly designed according to the internal space of the infusion structure 110. At the same time, a plurality of connection terminals can be provided on the flexible circuit board to be electrically connected to different second electrical contacts 113, so as to conduct the circuit between the control structure 100 and the infusion structure 110, so that the infusion device can realize the normal infusion function.

[0089] An elastic conductor 136 is also provided inside the infusion structure 130. The elastic conductor 136 is electrically connected to the power source 133 and specific connection terminals on the circuit board (or three-dimensional circuit) respectively, thereby realizing power supply to the specific structural unit.

[0090] Figure 5 FIG. 1 is a schematic diagram of a three-dimensional structure of an elastic conductor 136 according to an embodiment of the present invention.

[0091] In the embodiment of the present invention, the elastic conductor 136 includes a first elastic conductive part 136a connected to the power supply 133 and a second elastic conductive part 136b connected to a specific connection end on the circuit board (or three-dimensional circuit). At least one protrusion 1361 is provided on each of the first elastic conductive part 136a and the second elastic conductive part 136b, which facilitates the point contact connection or line contact connection between the first elastic conductive part 136a and the power supply 133, and the point contact connection or line contact connection between the second elastic conductive part 136b and the specific connection end on the circuit board (or three-dimensional circuit), thereby improving the electrical connection reliability between the elastic conductive piece 136 and the power supply 133 and the specific connection end on the circuit board (or three-dimensional circuit). When the elastic conductive piece 136a and the second elastic conductive part 136b are both planes, it is very likely that the connection between the elastic conductor 136 and the power supply 133 and the specific connection end on the circuit board (or three-dimensional circuit) will be poor during use, thereby affecting the use effect. In an embodiment of the present invention, the protrusion 1361 may be a line protrusion formed by bending the first elastic conductive portion 136a or the second elastic conductive portion 136b, or may be a plurality of point-shaped or other shaped protrusions formed by processing the first elastic conductive portion 136a or the second elastic conductive portion 136b by other means. The form and quantity of the protrusions 1361 on the first elastic conductive portion 136a or the second elastic conductive portion 136b may be the same or different. Here, the form, quantity and formation method of the protrusion 1361 are not specifically limited, as long as the point contact connection or line contact connection between the elastic conductor 136 and the specific connection ends on the power supply 133 and the circuit board (or three-dimensional circuit) can be strengthened to improve the reliability of the electrical connection.

[0092] In the embodiment of the present invention, the first elastic conductive portion 136a and the second elastic conductive portion 136b are approximately arranged in an "L" shape, the first elastic conductive portion 136a is approximately parallel to the main frame 137, and the second elastic conductive portion 136b is approximately perpendicular to the main frame 137. In other embodiments of the present invention, the first elastic conductive portion 136a and the second elastic conductive portion 136b can also be arranged in other shapes, which are not specifically limited here, as long as the power supply 133 can be electrically connected to a specific connection terminal on the circuit board (or three-dimensional circuit). At the connection between the first elastic conductive portion 136a and the second elastic conductive portion 136b (such as Figure 5 The insulating component 1362 is also provided to prevent the power component 1311 from contacting the elastic conductor 136 during operation to cause a short circuit and stop the infusion structure 130 from working. In the embodiment of the present invention, the insulating component 1362 is formed by printing ink. In other embodiments of the present invention, the insulating component 1362 may also be insulating glue, insulating paint or other insulating materials, which are not specifically limited here.

[0093] In an embodiment of the present invention, the elastic conductor 136 may be a metal sheet including a first elastic conductive part 136a and a second elastic conductive part 136b, or may be an integrated body formed by directly or indirectly electrically connecting the first elastic conductive part 136a and the second elastic conductive part 136b separately, and no limitation is made here. When the elastic conductor 136 is a metal sheet including a first elastic conductive part 136a and a second elastic conductive part 136b, not only is the manufacturing process of the elastic conductor 136 simple, the connection between the first elastic conductive part 136a and the second elastic conductive part 136b is firm, and the volume of the elastic conductor 138 can be reduced, saving materials and reducing raw material costs and production costs. When the elastic conductor 136 is formed by directly or indirectly electrically connecting the first elastic conductive part 136a and the second elastic conductive part 136b through other conductive elements, the elastic conductive part can be flexibly selected according to the needs of the specific connecting parts to optimize the internal design of the infusion structure.

[0094] In the embodiment of the present invention, a positioning column 138 is further provided on the main frame 137, and an opening adapted to the positioning column 138 is provided on the elastic conductor 136. The elastic conductor 136 is sleeved on the positioning column 138 through the opening, so that the elastic conductor 136 is fixed on the main frame 137. At the same time, the positioning column 138 is melted by hot melting to further fix the elastic conductor 136, so as to prevent the elastic conductor 136 from shaking due to long-term use or other reasons, thereby preventing the elastic conductor 136 from having a poor connection with a specific connection end on the power supply 133 or the circuit board (or the three-dimensional circuit), thereby affecting the use.

[0095] In the embodiment of the present invention, a boss 139 is further provided on the main frame 137, and the boss 139 is located below the first elastic conductive part 136a to prevent the protrusion 1361 of the first elastic conductive part 136a from being flattened or deformed during long-term use, thereby causing poor connection and contact between the first elastic conductive part 136a and a specific connection end on the circuit board (or three-dimensional circuit), thereby causing a malfunction. Preferably, the setting position of the boss 139 deviates from the projection position of the protrusion 1361 on the main frame 137 and is close to the positioning column 138. On the one hand, it can prevent the first elastic conductive part 136a from being hard-contacted or pressed against the specific connection end on the circuit board (or three-dimensional circuit) to damage the circuit board, and on the other hand, it can ensure the elastic electrical contact between the first elastic conductive part 136a and the specific connection end on the circuit board (or three-dimensional circuit).

[0096] Similar to the elastic conductive member, the types of the elastic conductor 136 include conductive springs, conductive springs, conductive rubber or conductive silicone, etc., and are not specifically limited here, as long as the conditions for electrically connecting the power source 133 to a specific connection terminal on the circuit board (or three-dimensional circuit) can be met. Preferably, in the embodiment of the present invention, the elastic conductor 136 is a conductive spring. Obviously, since the infusion structure 110 has a double-row battery, the elastic conductor 136 is also designed as a double-row structure, such as Figure 4a shown.

[0097] The elastic conductor 136 can realize direct electrical connection between the power source 133 and a specific structural unit, thereby reducing the circuit design inside the structure and reducing the complexity of the internal structure.

[0098] like Figure 4a As shown, the infusion structure 110 also includes a driving unit 1310 and a power component 1311, which are arranged on the main frame 137. The main frame 137 is also provided with a rotating shaft 1313. The driving unit 1310 is provided with a through hole, and the driving unit 1310 is fixed on the rotating shaft 1313 through the through hole; the driving unit 1310 includes a driving end 1312, one end of the power component 1311 is connected to the driving unit 1310, and the other end is connected to a specific electrical connection end on a circuit board or a three-dimensional circuit through a conductive platform 1314, and further connected to the control module in the control structure 100. The control module in the control structure 100 applies power to the power component 1311, and the driving unit 1310 rotates around the rotating shaft 1313, driving the driving end 1312 to move forward to push the gear teeth of the driving wheel 134 forward, so that the infusion device performs drug infusion. In the embodiment of the present invention, there are two driving ends 1312, and the corresponding power components 1311 are also two. In another embodiment of the present invention, the driving end 1312 and the power component 1311 are each one. Figure 4c shown.

[0099] A conductive tower spring 1315 is also provided inside the infusion structure 110, which is sleeved on the rotating shaft 1313, with one end abutting the driving unit 1310 and the other end electrically connected to a specific electrical connection end on the circuit board or the three-dimensional circuit, so as to fix the driving unit 1310 and realize the electrical connection between the driving unit 1310 and the specific electrical connection end on the circuit board or the three-dimensional circuit.

[0100] Figure 6 A schematic diagram of a three-dimensional structure of a conductive tower spring 1315 according to an embodiment of the present invention.

[0101] In an embodiment of the present invention, the conductive tower spring 1315 includes a portion A with a small diameter in the center portion in the axial direction, and portions B and C with large diameters at both ends, wherein the diameters of portion A are consistent and the rotating shaft 1313 is fixed by interference fit to further fix the drive unit 1310, while portion B abuts against the drive unit 1310 to prevent the drive unit 1310 from shaking due to unstable fixation when it is accidentally touched, causing the drive end 1312 to push the drive wheel 134 forward, affecting the accuracy of infusion; the diameters of portions B and C gradually expand in a trumpet shape toward both ends, and when portions B and C are electrically connected to the drive unit 1310 and specific electrical connection ends on a circuit board or a three-dimensional circuit, respectively, the conductive tower spring 1315 is compressed, so portions B and C have multiple turns, and at least 2-3 turns of the spring are in contact with the drive unit 1310 and specific electrical connection ends on the circuit board or the three-dimensional circuit at the same time, thereby improving the electrical connection reliability of the infusion device.

[0102] Preferably, in the embodiment of the present invention, the B part and the C part of the conductive tower spring 1315 are symmetrical structures, and the two ends can be assembled at will to avoid assembly misalignment.

[0103] Figure 7 for Figure 4a A local magnified view of the M region.

[0104] In the embodiment of the present invention, at least one conductive platform 1314 is disposed inside the infusion structure 110. Specifically, when the driving unit 1310 includes two driving arms 1312, the corresponding power components 1311 and the conductive platforms 1314 are both two. Figure 4a When the driving unit 1310 includes one driver 1312, the corresponding power component 1311 and the conductive platform are both one, as shown in FIG. Figure 4c The conductive platform 1314 is electrically connected to the power component 1311 and specific connection terminals on the circuit board or three-dimensional circuit respectively.

[0105] The conductive platform 1314 includes a conductive platform body 141 and a conductive arm 142. The conductive arm 142 is an elastic conductive element. At least one conductive platform protrusion 1421 is provided on the conductive arm 142, which is convenient for point contact connection or line contact connection with a specific connection end on a circuit board (or a three-dimensional circuit), and improves the electrical connection reliability between the conductive platform 1314 and the specific connection end on the circuit board (or a three-dimensional circuit). When the conductive arm of the conductive platform 1314 is a planar structure, it is likely to cause poor connection contact between the conductive platform 1314 and the specific connection end on the circuit board (or a three-dimensional circuit) during use, thereby affecting the use effect. In the embodiment of the present invention, the conductive platform protrusion 1421 can be a line protrusion formed by bending the conductive arm 142, or it can be a plurality of point-shaped or other shaped protrusions formed by processing the conductive arm 142 by other means. Here, the form, number and formation method of the conductive platform protrusion 1421 are not specifically limited, as long as the electrical connection reliability between the conductive platform 1314 and the specific connection end on the circuit board (or a three-dimensional circuit) can be enhanced. In the embodiment of the present invention, the conductive platform body 141 further includes a conductive platform body end 1411, and the power component 1311 is an electrically driven linear actuator or an electrically heated linear actuator, such as a shape memory alloy, and is connected to the conductive platform body 141 by die casting, which has a stable connection and high electrical connection reliability. Specifically, the power component 1311 is placed in the conductive platform body end 1411 after being folded in half, and then connected to the conductive platform body end 1411 by die casting, which further improves the electrical connection reliability.

[0106] In an embodiment of the present invention, the conductive platform 1314 may be a metal sheet including a conductive platform body 141 and a conductive arm 142, or the conductive platform body 141 and the conductive arm 142 may be directly or indirectly electrically connected to form an integrated body through other conductive elements, and no limitation is made here. When the conductive platform 1314 is a metal sheet including a conductive platform body 141 and a conductive arm 142, not only can the manufacturing process of the conductive platform 1314 be simplified, the connection between the conductive platform body 141 and the conductive arm 142 be firm, but also the volume of the conductive platform 1314 can be reduced, materials can be saved, and the cost of raw materials and production costs can be reduced. When the conductive platform 1314 is formed by the conductive platform body 141 and the conductive arm 142 being electrically connected directly or indirectly through other conductive elements, the elastic conductive part can be flexibly selected according to the needs of the specific connecting parts to optimize the internal design of the infusion structure.

[0107] Similarly, the conductive platform body 141 and the conductive platform body end 1411 may also be metal sheets, or may be directly or indirectly electrically connected and integrated through other conductive elements, and no specific limitation is made here. The conductive platform 1314 may be a metal sheet including the conductive platform body 141, the conductive arm 142 and the conductive platform body end 1411, or two of them may be metal sheets and then be directly or indirectly electrically connected and integrated with a third party through other conductive elements, or all three may be directly or indirectly electrically connected and integrated through other conductive elements, and no specific limitation is made here. The benefits of various molding methods are as described above and will not be repeated again. Preferably, in an embodiment of the present invention, the conductive platform body 141, the conductive arm 142 and the conductive platform body end 1411 are integrally molded.

[0108] In the embodiment of the present invention, a plurality of blocks 1316 are provided on the main frame 137 for accommodating and limiting the position of the conductive platform 1314. A conductive platform positioning column 1317 is also provided on the main frame 137. An opening adapted to the conductive platform positioning column 1317 is provided on the conductive platform 1314. The conductive platform 1314 is sleeved on the conductive platform positioning column 1317 through the opening, so that the conductive platform 1314 is fixed to the main frame 137. At the same time, the conductive platform positioning column 1317 is melted by hot melting to further fix the conductive platform 1314, so as to prevent the conductive platform 1314 from shaking due to long-term use or other reasons, thereby causing poor connection between the conductive platform 1314 and a specific connection end on the circuit board (or three-dimensional circuit), thereby affecting use.

[0109] In the embodiment of the present invention, a conductive platform boss (not shown in the figure) is also provided on the main frame 137, and the conductive platform boss is located below the conductive arm 142 to prevent the conductive platform protrusion 1421 of the conductive arm 142 from being flattened or deformed during long-term use, thereby causing poor connection contact between the conductive platform 141 and the specific connection end on the circuit board (or three-dimensional circuit), thereby causing a malfunction. Preferably, the setting position of the conductive platform boss deviates from the projection position of the conductive platform protrusion 1421 on the main frame 137, and is close to the conductive platform positioning column 1317. On the one hand, it can prevent the conductive arm 142 from being hard-contacted or pressed against the specific connection end on the circuit board (or three-dimensional circuit) to damage the circuit board, and on the other hand, it can ensure the elastic electrical contact between the conductive arm 142 and the specific connection end on the circuit board (or three-dimensional circuit).

[0110] Similar to the elastic conductor 136, the types of the conductive platform 1314 include conductive springs, conductive shrapnel, conductive rubber or conductive silicone, etc., and there is no specific limitation here, as long as the conditions for electrically connecting the power component 1310 to the specific connection terminal on the circuit board (or three-dimensional circuit) can be met.

[0111] Figure 8a and Figure 8bThe figures are schematic diagrams of the structures before and after the assembly of the driving wheel assembly and the main frame 17 according to an embodiment of the present invention, respectively. Figure 8c FIG. 4 is a schematic diagram of a three-dimensional structure of a cover according to an embodiment of the present invention.

[0112] The driving wheel assembly includes a driving wheel body 16 and a movable block 18. The driving wheel body 16 includes a driving wheel 161, a driving tube 162, which is provided with a thread for accommodating a screw rod 135, and a connecting member 163 provided at the end of the driving wheel 161, and a connecting portion 1631 is provided on the connecting member 163 for operably connecting with the movable block 18. The movable block 18 is provided with a thread for accommodating the screw rod 135, and a movable block connecting rod 181 movably connected with the connecting portion 1631 is also provided on the movable block 18. After the connecting rod 181 is movably connected with the connecting portion 1631, the movable block 18 can rotate around the connecting rod 181, thereby opening or closing the movable block 18. When the movable block 18 is opened, the screw rod 135 can slide toward the driving wheel body 16 side, and when the movable block 18 is closed, the screw rod 135 cannot slide toward the driving wheel body 16 side, which will be described in detail below.

[0113] The driving wheel assembly also includes a cover 15, on which a plurality of cover engaging portions 151 are provided for engaging with the main frame 17. The main frame 17 is provided with a main frame groove 171 for accommodating the driving wheel body 16, and is also provided with a plurality of main frame engaging portions 172 for engaging with the cover engaging portions 151. After the driving wheel body 16 and the movable block 18 are connected, they are placed in the main frame groove 171, and then the cover 15 is assembled to the main frame 17. Through the engagement of the main frame engaging portion 173 and the cover engaging portion 151, the driving wheel body 16 and the movable block 18 can be fixed in the main frame 17, so as to prevent the shaking of the driving wheel body 16 from affecting the accuracy of drug infusion.

[0114] The main frame engaging portion 172 and the cover engaging portion 151 include one or more of hooks, blocks, holes, and slots that can be engaged with each other, and their positions can be flexibly designed according to the shape and structure of the main frame 17 and the cover 15, and are not specifically limited here. Preferably, the structural body formed by the plurality of main frame engaging portions 173 and the plurality of cover engaging portions 151 can just accommodate the driving wheel body 16 and the movable block 18 to prevent the driving wheel body 16 from shaking.

[0115] In the embodiment of the present invention, the cover 15 is further provided with at least one elastic arm 152 for elastically abutting the driving tube 162, which can further fix the driving wheel body 16, thereby improving the stability of the infusion structure 110 and the accuracy of drug infusion. Preferably, there are two elastic arms 152, which are arranged on both sides of one of the driving wheels 161, respectively abutting the driving tube 162, such as Figure 8b As shown, the driving wheel body 16 is fixed at multiple points.

[0116] The cover 15 is also provided with a baffle 153, and a groove is provided on the baffle 153. A slot 173 is also provided on the side of the main frame 17 near the drug storage cartridge 131, which is used to accommodate a baffle bar (not shown in the figure). The baffle bar abuts against the baffle 153 to form a through hole, which is used to accommodate the screw rod 135, and at the same time, the driving wheel body 16 and the movable block 18 are confined in the main frame 17. Preferably, the baffle 153 has a semicircular groove, and its diameter is adapted to the diameter of the screw rod 135, so as to better accommodate the screw rod 135 and prevent the screw rod 135 from shaking significantly under the action of external force.

[0117] Preferably, in the embodiment of the present invention, the cover is an integrally formed structure, which has simple process, small volume, firm connection, material saving and cost reduction.

[0118] Figure 9a-9d 1 is a schematic cross-sectional structural diagram and a schematic three-dimensional structural diagram of the movable block 18 in an open state and a closed state, respectively, according to an embodiment of the present invention.

[0119] The movable block 18 further includes an upper movable block 182 and a lower movable block 183, and the lower movable block 183 is further provided with a lower movable block end 1831. The movable block 18 is opened when the upper movable block 182 is close to the driving wheel 161, the lower movable block 183 is away from the driving wheel 161, the thread in the movable block 18 is not engaged with the screw 135, and the screw 135 can slide smoothly in the movable block 18 and the driving tube 162. The movable block 18 is closed when the upper movable block 182 is away from the driving wheel 161, and the lower movable block 183 is close to the driving wheel 161. At this time, the thread in the movable block 18 is engaged with the screw 135, and the screw 135 cannot slide in the movable block 18 and the driving tube 162.

[0120] In the embodiment of the present invention, an arc-shaped blocking member 174 is further provided on the main frame 17 to limit the position of the lower movable block 183. When the movable block 18 is opened, that is, the upper movable block 182 is close to the driving wheel 161, and the lower movable block 183 is away from the driving wheel 161, the lower movable block end 1831 of the lower movable block 183 is located outside the arc-shaped blocking member 174, so that the movable block 183 is kept in the open state. At this time, the thread in the movable block 18 does not bite with the screw 135, and the screw 135 can slide smoothly in the movable block 18 and the driving tube 162. When the movable block 18 is in the open state, the drug storage cartridge 131 can be filled with drugs. In the process of filling the drug storage cartridge 131, the screw 135 can smoothly move to the end of the driving wheel 161 under the driving action generated during the filling process until the filling is completed without the assistance of other components. The structure is simple, the integration is high, the cost is saved, the volume of the infusion structure 110 is reduced, and the actual drug storage space of the drug storage cartridge 131 is utilized to the maximum extent.

[0121] When the movable block 18 is closed, that is, the movable block 182 is away from the driving wheel 161 and the lower movable block 183 is close to the driving wheel 161, the lower movable block end 1831 of the lower movable block 183 is located on the inner side of the arc-shaped blocking member 174, and the movable block 18 remains in the closed state. At this time, the thread in the movable block 18 is engaged with the screw 135, and the screw 135 cannot slide in the movable block 18 and the driving tube 162. When the drug injection is completed, when the infusion device 110 implements drug infusion, the driving end 1312 of the driving unit 1310 pushes the driving wheel 161 forward, and the movable block 18 rotates with the driving wheel 161. During the rotation, after the end 1831 of the lower movable block bypasses the arc-shaped blocking member 174, since there is no longer any obstruction from the arc-shaped blocking member 174, the end 1831 of the lower movable block falls into the inner side of the arc-shaped blocking member 174. At the same time, since the movable block 18 remains in a closed state, the screw 135 can only move in the direction away from the driving wheel 161 under the driving action generated by the rotation of the driving wheel 161 to perform drug infusion, without worrying about the screw 135 moving freely due to the failure of the engagement of the screw 135 with the movable block 18 or the thread in the driving tube 162, thereby affecting the infusion effect or even causing the infusion device to fail.

[0122] In the embodiment of the present invention, the end surface of the driving wheel 16 close to the drug storage cartridge 131 is provided with a notch 1611, the shape of which is adapted to the lower movable block 183, for accommodating the lower movable block 183. When the end 1831 of the lower movable block bypasses the arc-shaped blocking member 174 and falls into the inner side of the arc-shaped blocking member 174, the lower movable block 183 is accommodated in the notch 1611 of the driving wheel 161, making full use of the space of the driving wheel body, optimizing the internal design of the infusion structure, and reducing the volume of the infusion device.

[0123] It should be noted here that “inside” and “outside” are relative to the arc-shaped blocking member 174 and are relative position concepts. Figure 9b or Figure 9d shown.

[0124] Figure 10a-Figure 10c Schematic diagram of the structure of the elastic member and the driving wheel assembly according to different embodiments of the present invention. Fig.10d for Fig.10b A local magnified view of the N region.

[0125] In an infusion device where a single pawl drives a gear to rotate to complete drug infusion, such as Figure 4cDue to the structural characteristics of the gear teeth and the circumference of the driving wheel 134, the pressure applied by the driving end 1312 to the driving wheel 134 is not equal at different positions. Therefore, when the power unit 1311 applies power to the driving end 1312, the driving end 1312 can push the gear teeth to rotate the driving wheel, thereby achieving drug infusion. When the reset component 1320 applies power to the driving end 1312, the driving end 1312 performs a reset movement, the driving end 1312 stops pushing the gear and slides on the surface of the gear teeth. At this time, the driving wheel may rotate in the forward direction or in the reverse direction.

[0126] In an embodiment of the present invention, the power component 1311 includes an electrically driven linear actuator or an electrically heated linear actuator. Specifically, the power component 1311 is a shape memory alloy. The reset component 1320 includes an electrically driven linear actuator, an electrically heated linear actuator or an elastic member. The types of elastic members include but are not limited to compression springs, tension springs, torsion springs, springs, elastic plates, elastic rods, elastic rubbers, etc. The elastic member can automatically rebound the driving end 1312 to its original position without the aid of external force. Specifically, in an embodiment of the present invention, the reset component 1320 is a torsion spring. The torsion spring is more conducive to the reset of the driving end 1312.

[0127] If the driving wheel 134 rotates in the forward direction or in the reverse direction, the accuracy of drug infusion will be reduced, and there will be safety hazards. Therefore, conventional ratchet push generally requires an additional anti-reversal fixed ratchet, or two ratchet pawls arranged in opposite directions are used in combination, such as Figure 4a As shown, the friction force can be provided by a friction component to ensure that the driving wheel does not rotate in the opposite direction, but generally an additional base is required to carry the component providing the friction force. Therefore, the number of other components such as the pawl in the infusion device is large, the design is relatively complex, the space utilization rate inside the infusion device is low, and the friction force provided does not have an adjustable range, and cannot effectively prevent the driving wheel from reversing.

[0128] In the infusion device disclosed in the embodiment of the present invention, there is no need to additionally set up an anti-reversal pawl, nor is there a need for an additional base to carry the component providing friction. The component providing friction is directly set on the driving wheel cover 201, which can assist the driving wheel cover 201 in increasing the fixing effect on the driving wheel 200, and because the component providing friction is an elastic component, the driving wheel 200 can be elastically fixed, so that it can resist external impacts within a larger range, and at the same time, it can also provide elastic friction, which can effectively prevent the driving wheel 200 from reversing, and can also make full use of the internal space to reduce the volume of the infusion device.

[0129] In one embodiment of the present invention, the elastic member is one of a compression spring, a tension spring, and a torsion spring. Preferably, Fig.10aAs shown, in the embodiment of the present invention, the elastic member is a torsion spring, and a cylindrical component 202 is provided at the end of the driving wheel cover 201 for sleeve-connecting the torsion spring 203. One end of the torsion spring 203 abuts against the driving tube 204, and the other end is plugged into the driving wheel cover 201. In other embodiments of the present invention, the other end of the torsion spring 203 can also abut against the driving tube 204, and the other end of the torsion spring 203 can also abut against the side (non-gear surface) of the driving wheel 200. The torsion spring 203 can increase the maximum static friction force on the driving wheel 200 by applying pressure to the side of the driving tube 204 or the driving wheel 200, thereby preventing the driving wheel 200 from reversing. The specific abutment position and direction can be adjusted according to the range of the required friction force. The torsion spring 203 can provide elastic force in a larger range, so it can better elastically fix the driving wheel and reverse the driving wheel.

[0130] In another embodiment of the present invention, at least one elastic rod is provided on the driving wheel cover 201. Fig.10b and Fig.10d As shown in the figure, a U-shaped elastic rod 205 is provided on the driving wheel cover 201, and the "I"-shaped part of the U-shaped elastic rod 205 spans the top of the driving wheel cover 201. One end of the U-shaped elastic rod 205 abuts against the A position of the driving tube 204, and the abutting position of the other side is not shown in the figure. It should be noted that in the embodiment of the present invention, both ends of the U-shaped elastic rod 205 can abut against the driving wheel tube 204 or the side of the driving wheel 200 in whole or in part. The driving wheel cover 201 is also provided with an L-shaped elastic rod 206, referring to Fig.10b and Fig.10d In the direction shown, the "I"-shaped part of the L-shaped elastic rod 206 spans the top of the driving wheel cover 201, the "I" part abuts against the B position of the driving wheel tube 204, and the "I" part can also abut against the side of the driving wheel 200. The U-shaped elastic rod 205 and / or the L-shaped elastic rod 206 can increase the maximum static friction force on the driving wheel 200 by applying pressure to the side of the driving tube 204 or the driving wheel 200, thereby preventing the driving wheel 200 from reversing. Preferably, a groove 209 is also provided on the top of the driving wheel cover 201, and the U-shaped elastic rod 205 and the L-shaped elastic rod 206 are clamped on the driving wheel cover 201 through the groove 209, so that the U-shaped elastic rod 205 and / or the L-shaped elastic rod 206 are more stably clamped on the driving wheel cover 201, so as to provide a more stable elastic friction range to prevent the driving wheel from reversing 200, and at the same time, the driving wheel 200 can be elastically fixed. It should be noted that, in the embodiment of the present invention, the specific shape of the elastic rod is not specifically limited, and can be flexibly arranged according to the structural characteristics of the driving wheel cover 201. The number of elastic rods and the specific abutment positions of the elastic rods and the driving wheel assembly are also not specifically limited, and can be adjusted according to the required friction force range.

[0131] In another embodiment of the present invention, the elastic member is one or more of silicone, rubber, latex, spring steel, such as Fig.10c As shown, preferably, in the embodiment of the present invention, the elastic member is silicone, and at least one silicone 207 is disposed on the cover engaging portion 208, abutting against the driving tube 204. The silicone 207 can increase the maximum static friction force on the driving wheel 200 by applying pressure to the driving tube 204, thereby preventing the driving wheel 200 from reversing. The silicone 207 and the cover engaging portion 208 are an integrated structure, symmetrically distributed on both sides of the driving tube 204, to provide a stable elastic friction force range to prevent the driving wheel 200 from reversing, and at the same time can elastically fix the driving wheel 200, further reducing the number of components and reducing the volume of the infusion device.

[0132] It should be noted that the types, quantities, positions, and layouts of the elastic members in the above-mentioned multiple embodiments of the invention, such as the torsion spring 203, the U-shaped elastic rod 205, the L-shaped elastic rod 206, and the silicone 207 on the driving wheel cover 201, and the contact modes with the driving tube 204 or the driving wheel 200 are not specifically limited here, and can be selected according to actual needs. For example, the torsion spring 203 and the silicone 207 can be selected to provide elastic friction at the same time, such as Fig.10a As shown, it is sufficient as long as elastic friction can be provided to prevent the driving wheel 200 from reversing and elastically fix the driving wheel 200 at the same time.

[0133] In another embodiment of the present invention, the elastic member and the reset member 1320 are the same member. Preferably, the reset member 1320 is a torsion spring, one end of which is connected to the drive unit 1310, and the other end is abutted against the side of the drive tube 204 or the drive wheel 200. By applying pressure to the side of the drive tube 204 or the drive wheel 200, the maximum static friction force on the drive wheel 200 can be increased, thereby preventing the drive wheel 200 from reversing. The location of the reset member 1320 on the drive wheel cover 200 is not specifically limited here, and can be set on the top, side or other positions of the drive wheel cover 200. Therefore, in the embodiment of the present invention, the reset member 1320 can not only provide elastic force to make the drive end 1312 perform reset movement, but also provide elastic friction to prevent the drive wheel from reversing, and can also assist the drive wheel cover 201 to elastically fix the drive wheel 100, further reducing the number of components and reducing the volume of the infusion device.

[0134] In summary, the present invention discloses an elastic anti-reversal drug infusion device, in which at least one elastic member is arranged on the driving wheel cover of the infusion structure, which abuts against the driving wheel assembly. By applying pressure to the driving wheel assembly, the static friction force on the driving wheel can be increased to prevent the driving wheel from reversing. The type, quantity, position, and layout of the elastic member can be flexibly arranged on the cover, making full use of the internal space and effectively reducing the volume of the infusion device. The elastic member provides a variable elastic friction force within a certain range to better prevent the driving wheel from reversing. The elastic member is arranged on the driving wheel cover, and no other components are required to carry it, making full use of the internal space of the infusion device, increasing the compactness of the internal design, and the elastic member can also assist the driving wheel cover to elastically fix the driving wheel, greatly enhancing the user experience.

[0135] Although some specific embodiments of the present invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. An elastic anti-reversal drug infusion device, characterized in that: include: An infusion structure, comprising: The drug storage cylinder is used to contain the drug to be infused, and is provided with a screw and a piston connected to the screw; A driving wheel assembly, the driving wheel assembly comprising a driving wheel, a driving tube and a cover, the cover being used to fix the driving wheel, and the cover being further provided with at least one elastic member abutting against the driving wheel or the driving tube; A drive unit having a drive end, the drive end driving the drive wheel to rotate; A power component and a reset component connected to the driving unit, wherein the power component applies a force to the driving unit to make the driving wheel rotate in the forward direction, and the reset component applies a force to the driving unit to reset the driving end; a control structure, the control structure being electrically connected to the infusion structure, the control structure controlling the power component to apply a force to the drive unit; and an adhesive patch for adhering the control structure and the infusion structure to the skin surface; The infusion device further comprises a main frame for carrying the components of the infusion structure, the cover is provided with a plurality of cover engaging parts, and the main frame is provided with a plurality of main frame engaging parts engaging with the plurality of cover engaging parts; The reset component and the elastic component are the same component.

2. The elastic anti-reversal drug infusion device according to claim 1, characterized in that: The elastic member is one of a compression spring, a tension spring and a torsion spring.

3. The elastic anti-reversal drug infusion device according to claim 2, characterized in that: The end of the cover is provided with a cylindrical component for sleeve-engaging the elastic component.

4. The elastic anti-reversal drug infusion device according to claim 3, characterized in that: At least one end of the elastic member abuts against the driving tube.

5. The elastic anti-reversal drug infusion device according to claim 1, characterized in that: The elastic member is an elastic rod.

6. The elastic anti-reversal drug infusion device according to claim 5, characterized in that: The top of the cover is provided with a groove for accommodating the elastic rod.

7. The elastic anti-reversal drug infusion device according to claim 6, characterized in that: The elastic rod abuts against the side surface of the driving tube and / or the driving wheel.

8. The elastic anti-reversal drug infusion device according to claim 1, characterized in that: The elastic member is arranged on the at least one cover engaging portion.

9. The elastic anti-reversal drug infusion device according to claim 8, characterized in that: The elastic member is one or more of silicone, rubber, latex, and spring steel.

10. The elastic anti-reversal drug infusion device according to claim 9, characterized in that: The cover engaging portion and the elastic member are an integral structure.

11. The elastic anti-reversal drug infusion device according to claim 1, characterized in that: The control structure and the infusion structure are separate structures, and the control structure is reusable.

12. The elastic anti-reversal drug infusion device according to claim 1, characterized in that: The control structure and the infusion structure are an integrated structure and are disposed of as a whole after use.

13. The elastic anti-reversal drug infusion device according to claim 1, characterized in that: The adhesive patch comprises an adhesive tape and a protective film, and the surface of the adhesive tape is provided with densely arranged air permeable holes evenly arranged.

Images