Medication infusion device

Abstract

The application relates to a medicine infusion device, which comprises a shell for mounting a medicine storage device, a driving mechanism and a control circuit board, the driving mechanism comprising a sleeve, a motor and a push rod, the sleeve being fixedly mounted on the inner wall of the shell, and the push rod being slidingly mounted in the inner cavity of the sleeve; one end of the push rod abuts against the piston of the medicine storage device, and the other end is rotationally connected with the rotating shaft of the motor; the motor is conductively connected with the control circuit board; the shell further comprises a flexible circuit board, which is mounted on the motor; a conductive device is arranged on the push rod, and the conductive device is used for triggering the conductive communication between the flexible circuit board and the control circuit board at the initial position of the push rod. The medicine infusion device provided by the embodiment uses the flexible circuit board to monitor the motor reset, the structure is more compact, and the internal space of the medicine infusion device is reasonably utilized.

Description

Technical Field

[0001] This application relates to the field of drug infusion technology, and in particular to drug infusion devices. Background Technology

[0002] Diabetes is a chronic metabolic disease. If it is not effectively controlled, long-term hyperglycemia can cause irreversible damage to multiple organs and systems throughout the body, leading to a series of serious complications.

[0003] Currently, effective blood glucose control involves administering insulin via an insulin infusion device to regulate blood glucose levels. Diabetes, as a chronic disease, requires long-term insulin use for blood glucose management. Typically, insulin infusion devices work in conjunction with the patient's infusion needs, receiving input commands and controlling a plunger to move a piston within the reservoir for infusion. Before replacing the reservoir with one if the insulin level falls below a certain threshold, the plunger, having completed its full stroke, is reset to its initial position. Existing plunger reset mechanisms use physical pressure buttons to monitor reset completion, resulting in a complex product structure, high requirements for waterproofing, increased costs, and an inability to meet patients' actual daily insulin infusion needs. Utility Model Content

[0004] Therefore, it is necessary to provide a drug infusion device to address the technical problems of existing insulin infusion devices, such as their limited operation and inability to meet patients' daily insulin infusion needs.

[0005] This application provides a drug infusion device according to this embodiment, including a housing for mounting a drug reservoir, a drive mechanism, and a control circuit board. The drive mechanism includes a sleeve, a motor, and a push rod. The sleeve is fixedly mounted on the inner wall of the housing, and the push rod is slidably mounted in the inner cavity of the sleeve. One end of the push rod abuts against the piston of the drug reservoir, and the other end is rotatably connected to the rotating shaft of the motor. The motor is electrically connected to the control circuit board.

[0006] The housing also includes a flexible circuit board, which is mounted on the motor. The push rod is equipped with a conductive device, which is used to trigger the flexible circuit board to make conductive connection with the control circuit board at the initial position of the push rod.

[0007] In one embodiment, the flexible circuit board includes an annular substrate and at least one metal contact disposed on the annular substrate. The annular substrate is fitted onto the stator of the motor. At the initial position of the push rod, the conductive device is electrically connected to the metal contact.

[0008] In one embodiment, the annular substrate is provided with a connector, and the control circuit board is provided with a connector adapted to the connector, wherein the connector and the connector are plugged into each other.

[0009] In one embodiment, the push rod is provided with a slider, and the inner wall of the sleeve is provided with a groove adapted to the slider, and the slider is slidably installed in the groove.

[0010] In one embodiment, the slider is provided with a mounting slot for mounting the conductive device, and the conductive device is detachably mounted in the mounting slot.

[0011] In one embodiment, the outer wall of the sleeve is provided with a limiting structure, and the inner wall of the housing is provided with an opening that matches the shape of the limiting structure. The limiting structure is detachably installed in the opening.

[0012] In one embodiment, the housing is provided with a touch screen, which is electrically connected to the control circuit board. The display area of ​​the touch screen is used to display at least one interactive element, which is used to receive preset touch actions input by the user.

[0013] In one embodiment, the drug infusion device further includes a cover and a motor mounting base. The cover is engaged with the housing, and the motor mounting base is disposed on the cover for fixing the motor. A metal gasket, a pressure sensor, and an elastic element are sequentially provided between the motor mounting base and the cover. The pressure sensor is electrically connected to the control circuit board.

[0014] In one embodiment, the drug infusion device further includes a battery cover and a battery compartment, the battery compartment being used to house a battery for supplying power to the motor, control circuit board, and touch screen, and the battery cover being used to encapsulate the battery.

[0015] In one embodiment, the drug infusion device further includes a protective cover, the protective cover including a cover body and a clamping part, the clamping part being rotatably mounted on the cover body, the cover body being fitted onto the housing and exposing the touch screen.

[0016] The drug infusion device provided in this application can be used to infuse liquid drugs such as insulin. Before replacing the reservoir, the push rod, which has been exposed for its entire stroke, needs to be reset to its initial position. This application generates a reset completion signal by monitoring the conductive connection between a conductive device on the push rod and a metal contact on a flexible circuit board. Based on the reset completion signal, the motor's rotating shaft is controlled to stop rotating in the reverse direction, thereby promptly stopping the push rod's movement. This application uses the conductive connection between the conductive device and the metal contact to achieve the reset monitoring function and structural monitoring. Furthermore, the conductive device used is a common electronic component, further reducing product costs and expanding its ability to meet patients' real needs for daily insulin infusion. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the installation process of a drug infusion device in one embodiment.

[0018] Figure 2 This is a schematic cross-sectional view of a drug infusion device from a first perspective in one embodiment.

[0019] Figure 3 This is a schematic cross-sectional view of the drug infusion device from a second perspective in one embodiment.

[0020] Figure 4 This is a schematic diagram of the structure of a flexible circuit board in one embodiment.

[0021] Figure 5 This is a schematic diagram of the push rod in one embodiment.

[0022] Figure 6 This is a schematic diagram of a structure in one embodiment where the push rod is separated from the conductive device.

[0023] Figure 7 This is a schematic diagram of the sleeve structure in one embodiment.

[0024] Figure 8 This is a schematic diagram of a structure in one embodiment where the sleeve and the housing are separated.

[0025] Figure 9 This is a cross-sectional structural diagram of the drive mechanism in one embodiment.

[0026] Figure 10 This is a schematic diagram of the structure of a drug infusion device with a protective cover installed in one embodiment.

[0027] Figure 11 This is a schematic diagram of the protective cover in one embodiment. Detailed Implementation

[0028] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0029] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0030] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0031] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0032] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0033] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0034] refer to Figures 1 to 3 and Figure 10 This is a schematic diagram of a drug infusion device according to one embodiment. Figure 1As shown, the drug infusion device 10 provided in this application includes: a housing 11, which is used to install a drug reservoir 2, a drive mechanism 12 and a control circuit board 13, and the housing 11 is provided with a drug storage chamber 104 for installing the drug reservoir 2. The drive mechanism 12 includes a sleeve 121, a motor 122, and a push rod 123. The sleeve 121 is fixedly installed on the inner wall of the housing 11, and the push rod 123 is slidably installed in the inner cavity of the sleeve 121. One end of the push rod 123 abuts against the piston of the drug reservoir 2, and the other end is rotatably connected to the rotating shaft of the motor 122. The motor 122 is electrically connected to the control circuit board 13. The control circuit board 13 is used to generate an infusion control signal according to the preset infusion operation input by the user. The infusion control signal is used to control the rotating shaft of the motor 122 to rotate forward to drive the push rod 123 to move forward to perform the infusion function. In this embodiment, the preset infusion operation includes basal rate infusion operation, temporary basal rate infusion operation, high-dose infusion operation, etc. High-dose infusion refers to the infusion of a large dose within a certain period of time to respond to the special needs of starting high-dose insulin infusion, such as eating. High-dose infusion can include conventional high-dose infusion, square wave infusion, or dual-wave infusion. Conventional high-dose infusion means that the infusion is completed in one go. Square wave high-dose infusion means infusion is completed within the infusion duration. Dual-wave high-dose infusion includes conventional high-dose infusion and square wave infusion. For example, if a user needs to infuse 7U immediately and then 5U within 2 hours, dual-wave high-dose infusion can be used. Basal rate infusion refers to continuous micro-infusion over a certain period of time to maintain daily metabolism. Basal rate infusion can include conventional basal rate infusion or temporary basal rate infusion. Conventional basal rate infusion can be used to meet metabolic needs during normal times, while temporary basal rate infusion can be used to maintain metabolic needs during temporary periods. For example, a user can control the drug infusion device 10 to perform conventional basal rate infusion during normal times, and can control the drug infusion device 10 to switch to temporary basal rate infusion during special periods such as temporary exercise or temporary eating. The control circuit board 13 controls the rotating shaft of the motor 122 to rotate in the forward direction according to different infusion control signals. The push rod 123 provided in this application has a hollow inner wall, reducing the product's weight and resulting in a compact structure. The push rod 123 is sleeved on the rotating shaft of the motor 122. The rotating shaft of the motor 122 has external threads, and the inner wall of the push rod 123 has internal threads. The ends of the push rod 123 and the rotating shaft of the motor 122 are rotatably connected through a threaded structure. In this embodiment, the push rod 123 is slidably installed inside the sleeve 121. The rotational motion output from the rotating shaft of the motor 122 pushes the push rod 123 to move linearly along the inner wall of the sleeve 121. The end 1231 of the push rod 123 abuts against the piston inside the drug reservoir 2. The linear movement of the push rod 123 pushes the piston of the drug reservoir 2 forward, thereby squeezing the drug inside the drug reservoir 2 and achieving drug infusion.

[0035] like Figure 4As shown, the drug infusion device 10 provided in this embodiment also includes a flexible circuit board 14, which is electrically connected to the control circuit board 13. A conductive device 15 is provided on the push rod 123. After the reset function is activated, the control circuit board 13 controls the rotation axis of the motor 122 to reverse the rotation to drive the push rod 123 to move backward. When the push rod 123 moves backward to the initial position, the conductive device 15 triggers the flexible circuit board 14 and the control circuit board 13 to make conductive connection. The control circuit board 13 generates a motor stop control signal and controls the motor 122 to stop rotating according to the motor stop control signal. The user can be reminded that the reset is complete through interface reminders, vibration, or ringing feedback.

[0036] The drug infusion device 10 provided in this embodiment uses a flexible circuit board 14 for motor reset monitoring, which makes the structure more compact and makes reasonable use of the internal space of the drug infusion device 10. Of course, while realizing the motor reset monitoring function, a regular PCB circuit board can also be used to replace the flexible circuit board 14. This embodiment does not limit this.

[0037] The reset function provided in this embodiment refers to the function whereby, after a period of use, the amount of medicine in the drug reservoir 2 of the drug infusion device 10 falls below a threshold, or in the event of an unexpected situation during use, the push rod 123 needs to be reset to its initial position. The control circuit board 13 generates a motor control signal based on the user-input preset reset operation. This signal controls the reverse rotation of the motor 122's rotating shaft to retract the push rod 123 to its initial position. In the initial position, if the control circuit board 13 detects that the conductive device 15 on the push rod 123 has triggered a conductive connection between the flexible circuit board 14 and the control circuit board 13, the control circuit board 13 generates a motor stop control signal. This signal stops the rotation of the motor 122's rotating shaft, thereby stopping the push rod 123's linear movement and preventing excessive movement of the push rod 123 from damaging the internal structure of the housing 11.

[0038] In this embodiment, the conductive device 15 on the push rod 123 is used to trigger the conductive connection between the flexible circuit board 14 and the control circuit board 13 to monitor the completion of the reset operation. The structure is more stable. The conductive device 15 can be a common electronic device such as conductive silicone to complete the reset monitoring, which simplifies the product structure. Moreover, the use of the conductive device 15 to achieve conductive connection improves the waterproof function of the product and reduces the product cost.

[0039] The initial position of the push rod 123 mentioned in this embodiment can refer to the position of the push rod 123 before it starts moving, or it can be understood as the original position of the push rod 123 before the drug infusion device 10 starts any infusion function. At the initial position of the push rod 123, the conductive device 15 triggers the flexible circuit board 14 to electrically connect with the control circuit board 13, and the control circuit board 13 controls the rotation axis of the motor 122 to stop rotating. The control circuit board 13 generates an infusion control signal according to the preset infusion operation input by the user, and starts the motor 122 to work. The drug infusion device 10 provided in this embodiment has a compact reset structure and supports the user's expected infusion and reset operations. Compared with existing drug infusion devices that use physical key reset monitoring, it is more cost-effective and has higher reliability.

[0040] In one exemplary embodiment, such as Figures 2 to 4 As shown, the flexible circuit board 14 includes an annular substrate 140 and at least one metal contact 141 disposed on the annular substrate 140. The annular substrate 140 is sleeved on the motor 122. At least one metal contact 141 can be provided for contacting the conductive device 15 to achieve a conductive connection. Alternatively, multiple metal contacts 141 can be provided, resulting in a larger contact area with the conductive device 15 and a more robust conductive connection. Multiple metal contacts 141 are spaced apart on the annular substrate 140. The annular substrate 140 is fabricated using printed circuitry on a flexible substrate surface. At the initial position of the push rod 123, the conductive device 15 on the push rod 123 contacts the metal contact 141 on the annular substrate 140, establishing a conductive connection between the flexible circuit board 14 and the control circuit board 13. This also optimizes the mounting space of the annular substrate 140, maintaining a compact product structure. The metal contacts 141 on the flexible circuit board 14 are exposed through an etching process, facilitating contact with the conductive device 15 to achieve a conductive connection. Multiple metal contacts 141 are provided to ensure a stable conductive connection with the conductive device 15, avoiding the failure of some metal contacts 141 due to repeated reset operations, thus preventing the formation of a stable and reliable conductive connection.

[0041] In an exemplary embodiment, the flexible circuit board 14 provided in this embodiment further includes a cutout portion 142, which is sleeved on the stator of the motor 122 for easy installation and disassembly.

[0042] In an exemplary embodiment, the flexible circuit board 14 provided in this embodiment further includes a connector 143. The control circuit board 13 is provided with a connector seat adapted to the connector 143. The connector 143 is inserted into the connector seat to conduct electricity. The connector 143 of the flexible circuit board 14 is installed on the control circuit board 13 by plugging, which facilitates installation and disassembly.

[0043] In one exemplary embodiment, such as Figure 5 and Figure 6The push rod 123 is equipped with a slider 124, and the inner wall of the sleeve 121 is provided with a groove 125 adapted to the slider 124. The slider 124 is slidably installed in the groove 125. In this embodiment, the groove 125 is used to limit the axial movement of the slider 124 along the sleeve 121. Therefore, in order to keep the slider 124 moving smoothly in the groove 125, at least two grooves 125 can be provided, arranged circumferentially along the inner wall of the sleeve 121. The control circuit board 13 controls the rotation shaft of the motor 122 to drive the push rod 123 to move according to the infusion control signal, thereby driving the push rod 123 to move smoothly in a straight line in the groove 125, and thus smoothly realize the extrusion of the medicine.

[0044] In this embodiment, the outer wall 1232 of the push rod 123 is provided with protrusions 1233 arranged at intervals. The continuous protrusions 1233 are used to strengthen the connection strength between the slider 124 and the outer wall 1232, and avoid the problem of connection strength failure after repeated use.

[0045] In one exemplary embodiment, such as Figure 6 The slider 124 is provided with a mounting groove 127 for mounting the conductive device 15, and the conductive device 15 can be detachably mounted in the mounting groove 127. Since the flexible circuit board 14 is mounted on the motor 122, the flexible circuit board 14 can be fixed to the motor 122 using the sleeve 121, and the groove opening of the slide 125 is aligned with the metal contact 141 of the flexible circuit board 14. The slide 125 is used to expose the metal contact 141 and make a conductive connection with the conductive device 15. When the push rod 123 is reset to the initial position, the conductive device 15 abuts against the metal contact 141 to form a conductive connection. The mounting groove 127 is provided with a socket, and the conductive device 15 is provided with a flange. The conductive device 15 is installed in the socket, and the flange is locked in the socket, which facilitates the fixation of the conductive device 15 and makes it difficult to fall off.

[0046] In one exemplary embodiment, such as Figure 7 and Figure 8 As shown, the outer wall 1211 of the sleeve 121 is provided with a limiting structure 126, and the inner wall of the housing 11 is provided with an opening 111 that matches the shape of the limiting structure 126. The limiting structure 126 is detachably installed in the opening 111. The sleeve 121 is fixed by the limiting structure 126, which is slidably installed in the opening 111. The limiting structure 126 may include a hook or a protrusion.

[0047] In one exemplary embodiment, Figure 1 , Figure 2 and Figure 10The housing 11 is equipped with a touch screen 16, which is electrically connected to the control circuit board 13. The display area of ​​the touch screen 16 is used to display at least two interactive elements, which are used to receive preset touch actions input by the user. Users do not need to use physical buttons to control the drug infusion device 10; instead, they can control the drug infusion device 10 more intuitively and quickly through the touch screen 16, simplifying the operation steps and improving the human-machine experience. The preset functions corresponding to the interactive elements include at least one of the following: high-dose infusion, basal rate infusion, stop infusion, pause infusion, reset filling, user settings, and screen unlock. The display area of ​​the touch screen 16 is rationally arranged to display at least two interactive elements, facilitating user touch operation of the drug infusion device 10. For example, the main interface of the touch screen 16 displays two graphical elements, with the two interactive elements corresponding to high-dose infusion and basal rate infusion, respectively. The high-dose infusion interactive element is used to set the high-dose infusion mode, and the basal rate infusion interactive element is used to set the basal rate infusion mode or a temporary basal rate infusion mode.

[0048] In this embodiment, the set of interfaces displayed on the touch-sensitive area of ​​the touch screen 16 includes a function menu interface. The function menu interface includes a stop-infusion interactive element.

[0049] The stop infusion icon is used to trigger the execution of the stop infusion mode, that is, to control the drug infusion device 10 to stop infusion. During the stop infusion period, the drive mechanism cannot move. The control circuit board 13 is used to control the touch-sensitive area to display the stop injection confirmation interface according to the user's gesture input to the stop infusion interactive element, and to control the drug infusion device 10 to end the infusion according to the user's confirmation interaction input to the stop injection confirmation interface.

[0050] Optionally, the control circuit board 13 is used to put the drive mechanism 12 into a prohibited movement state based on the user's confirmation input on the stop injection confirmation interface. The prohibited movement state refers to the state in which the drive mechanism 12 cannot move.

[0051] In one exemplary embodiment, the aspect ratio of the touch-sensitive area of ​​the touch screen 16 is 1:1 to 1:8 along the centerline of the housing 11. This aspect ratio facilitates the layout of display interaction elements and allows for single-finger operation, resulting in a more user-friendly experience.

[0052] Alternatively, the touch-sensitive area can display multiple function icons side by side, such as two or more function icons side by side, which enriches the display and makes it easier for users to select input.

[0053] The width-to-length ratio refers to the ratio between the width and length of the touch-sensitive area. In other words, the length of the touch-sensitive area along the centerline of the housing 11 is greater than or equal to the length perpendicular to the centerline. This indicates that the touch-sensitive area is relatively narrow and elongated, facilitating display and one-handed interaction, thus improving the user experience.

[0054] In one exemplary embodiment, optionally, the housing 11 may be provided with a fingerprint unlocking area, or the touch screen 16 may be provided with an unlocking identifier area or a face unlocking area, to facilitate user unlocking operations.

[0055] The overall shape of the drug infusion device 10 provided in the above embodiment is long and narrow, which is easy for users to hold and use. Users can quickly learn to use the drug infusion device 10 and facilitate user interaction.

[0056] In one exemplary embodiment, such as Figure 2 and Figure 3 , Figure 9 As shown, the drug infusion device 10 also includes a cover 17 and a motor mounting base 18. The cover 17 is engaged with the housing 11. The motor mounting base 18 is disposed on the cover 17 and is used to fix the motor 122. A metal gasket 101, a pressure sensor 102, and an elastic element 103 are sequentially arranged between the motor mounting base 18 and the cover 17. The pressure sensor 102 is electrically connected to the control circuit board 13. The pressure of the motor 122 is monitored by the pressure sensor 102. When the infusion line is blocked, the rotating shaft of the motor 122 pushes the push rod 123, which is subjected to a continuously increasing reaction force. When the reaction force exceeds a threshold, the pressure sensor sends an alarm signal to the control circuit board 13. The control circuit board 13 confirms the line blockage based on the alarm signal and controls the alarm component 131 to issue a blockage alarm reminder to the user. To prevent the reaction force from damaging the pressure sensor 102, the metal gasket 101 and the elastic element 103 are used to protect the pressure sensor and conduct pressure.

[0057] In this embodiment, as Figure 9 As shown, the motor mounting base 18 has a slot for mounting the motor 122, which is installed in the slot. The motor mounting base 18 can be designed with an annular groove for mounting the flexible circuit board 14. The motor 122 presses the flexible circuit board 14 into the annular groove to prevent misalignment of the flexible circuit board 14, which could lead to poor contact with the conductive device 15 and affect reset monitoring.

[0058] In one exemplary embodiment, such as Figure 2 and Figure 3 , Figure 10The drug infusion device 10 also includes a battery compartment 115 and a battery cover 19. A battery 3 is disposed within the battery compartment 115, and the battery cover 19 encapsulates the battery 3. The battery 3 supplies power to the motor 122, the control circuit board 13, and the touch screen 16. The battery 3 is secured within the battery compartment 115 by rotating the battery cover 19. To operate the battery cover 19, a rotating handle 191 is provided on the battery cover 19, allowing easy opening of the battery compartment 115 and removal of the battery 3. Alternatively, the battery cover 19 may have a recess 191b, which can be used to open the battery compartment 115 by using a hard object to grip and rotate the cover.

[0059] The control circuit board 13 controls the subcutaneous drug infusion device 10, including insulin infusion, to begin infusion. Specifically, upon initiation, it activates the power supply to the drive mechanism 12 within the drug infusion device 10, for example, by supplying power to the control circuit board 13 and the drive mechanism 12 via the battery 3. The control circuit board 13 then determines the target number of motion coils based on a preset infusion function and controls the drive mechanism 12 of the drug infusion device 10 to rotate forward based on this target number of motion coils, thus controlling the drug infusion device 10 to perform the infusion. If the infusion is not completed, the process returns to the step of controlling the drive mechanism 12 of the drug infusion device 10 to rotate forward based on the target number of motion coils. If the infusion is complete, the power supply to the drive mechanism 12 within the drug infusion device 10 is deactivated, for example, by turning off the power to the control circuit board 13.

[0060] On the other hand, such as Figures 10 to 11 The drug infusion device 10 provided in this application also includes a protective cover 20. The protective cover 20 includes a cover body 21 and a clamping part 22. The clamping part 22 is rotatably mounted on the cover body 21 via a rotating shaft 23. The cavity 211 of the cover body 21 is fitted onto the housing 11 and exposes the touch screen 16, facilitating user operation of the touch screen 16. To prevent wear and tear and damage from drops, this application also provides a protective cover 20. The cover body 21 is fitted onto the outside of the housing 11, and the clamping part 22 is clamped at a fixed position for the user. Moreover, the clamping part 22 can be rotated arbitrarily according to actual usage needs. The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification.

[0061] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A drug infusion device, characterized in that, The device includes a housing (11) for mounting a medicine reservoir (2), a drive mechanism (12), and a control circuit board (13). The drive mechanism (12) includes a sleeve (121), a motor (122), and a push rod (123). The sleeve (121) is fixedly mounted on the inner wall of the housing (11), and the push rod (123) is slidably mounted in the inner cavity of the sleeve (121). One end of the push rod (123) abuts against the piston of the medicine reservoir (2), and the other end is rotatably connected to the rotating shaft of the motor (122). The motor (122) is electrically connected to the control circuit board (13). The housing (11) also includes a flexible circuit board (14), which is mounted on the motor (122). The push rod (123) is provided with a conductive device (15), which is used to trigger the flexible circuit board (14) and the control circuit board (13) to make conductive communication at the initial position of the push rod (123).

2. The drug infusion device as described in claim 1, characterized in that, The flexible circuit board (14) includes an annular substrate (140) and at least one metal contact (141) disposed on the annular substrate (140). The annular substrate (140) is sleeved on the stator of the motor (122). At the initial position of the push rod (123), the conductive device (15) is electrically connected to the metal contact (141).

3. The drug infusion device as described in claim 2, characterized in that, The annular substrate (140) is provided with a connector (143), and the control circuit board (13) is provided with a connector adapted to the connector (143). The connector (143) is inserted into the connector.

4. The drug infusion device as described in claim 2, characterized in that, The push rod (123) is provided with a slider (124), and the inner wall of the sleeve (121) is provided with a groove (125) that is adapted to the slider (124). The slider (124) is slidably installed in the groove (125).

5. The drug infusion device as described in claim 4, characterized in that, The slider (124) is provided with a mounting groove (127) for mounting the conductive device (15), and the conductive device (15) is detachably mounted in the mounting groove (127).

6. The drug infusion device as described in claim 4, characterized in that, The outer wall (1211) of the sleeve is provided with a limiting structure (126), and the inner wall of the housing (11) is provided with an opening (111) that matches the shape of the limiting structure (126). The limiting structure (126) can be detachably installed in the opening (111).

7. The drug infusion device according to any one of claims 1 to 6, characterized in that, The housing (11) is provided with a touch screen (16), which is electrically connected to the control circuit board (13). The display area of ​​the touch screen (16) is used to display at least one interactive element, which is used to receive preset touch actions input by the user.

8. The drug infusion device as described in claim 7, characterized in that, The drug infusion device further includes a cover (17) and a motor mounting base (18). The cover (17) is engaged with the housing (11). The motor mounting base (18) is disposed on the cover (17) and is used to fix the motor (122). A metal gasket (101), a pressure sensor (102), and an elastic element (103) are sequentially provided between the motor mounting base (18) and the cover (17). The pressure sensor (102) is electrically connected to the control circuit board (13).

9. The drug infusion device as described in claim 7, characterized in that, The drug infusion device also includes a battery cover (19) and a battery compartment (115), the battery compartment (115) for installing a battery (3), the battery (3) for supplying power to the motor (122), the control circuit board (13) and the touch screen (16), and the battery cover (19) for encapsulating the battery.

10. The drug infusion device as described in claim 7, characterized in that, The drug infusion device also includes a protective cover (20), which includes a cover body (21) and a clamping part (22). The clamping part (22) is rotatably mounted on the cover body (21), and the cover body (21) is fitted onto the housing (11) and exposes the touch screen (16).

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