Pen-type injector, control system, and automatic injection control method

Abstract

The present invention belongs to the technical field of syringes, and specifically relates to a pen-type syringe, a control system, and an automatic injection control method. The pen-type syringe includes a medicine chamber and a main unit, one end of which is detachably connected to one end of the main unit. The medicine chamber is provided with an awakening structure and a hidden needle linkage mechanism, which automatically switches the main unit from a dormant state to a standby state via the awakening structure. The hidden needle linkage mechanism causes an automatic drive component within the main unit to move toward the medicine chamber, pushing the piston of a medicine bottle within the chamber forward to complete automatic injection of liquid medicine. The present invention can automatically awaken the main unit and automatically trigger an injection without the need for keystrokes, thus avoiding accidental keystrokes or trigger failures and improving the safety and convenience of device use.

Description

Technical Field

[0001] The present invention belongs to the technical field of syringes, and in particular relates to a pen-type syringe, a control system, and an automatic injection control method. Background Art

[0002] Disposable prefilled syringes are prefilled injection devices primarily used for long-term or frequent medication administration. They are a common self-administration system with a large user market. Disposable prefilled syringes typically include manual syringes, spring-driven mechanical pen injectors, and motor-driven electronic pen injectors.

[0003] Among them, manual syringes generally complete the injection by holding the syringe and pushing the plunger. The injection speed is nonlinear and controlled by the injector, and the safety and convenience are poor.

[0004] The mechanical pen injector is driven by a spring and completes a one-time injection. After each injection, the entire mechanical injection pen is discarded as a consumable, which results in a large cost waste. In addition, the spring drive has inconsistent driving force, which is generally manifested as a large injection force in the first half and a small injection force in the second half. The injection speed is also fast and cannot be adjusted, which also has major defects.

[0005] Electronic pen injectors with motorized drives can address the aforementioned issues with manual and mechanical pen injectors. The main unit and drug reservoir are separate, with the drug reservoir being disposable as a single-use consumable, minimizing costs. Furthermore, the motorized drive allows for stable and adjustable speeds, automatic injection triggering, and a reusable main unit, making it a promising solution for the syringe market.

[0006] However, when using the electronic pen-type injectors currently on the market, a button is required to trigger the power on and the injection process. On the one hand, the button operation is prone to accidental touches, resulting in misoperation; on the other hand, after the injector host has been used for a period of time, the sensitivity of the button decreases, which can easily lead to the button not being triggered or malfunctioning, thereby affecting the use of the syringe. Summary of the Invention

[0007] In order to solve the technical problem in the prior art that electronic pen-type injectors are prone to misoperation or malfunction when using key operations, the present invention provides a pen-type injector and a control system, as well as an automatic injection control method.

[0008] To achieve the above object, the technical solution of the present invention is as follows:

[0009] In a first aspect, the present invention provides a pen-type injector comprising a drug reservoir and a main body, wherein one end of the drug reservoir is detachably connected to one end of the main body;

[0010] The medicine bin is provided with a wake-up structure, and the host has a wake-up trigger switch. The wake-up structure is configured such that when the medicine bin is connected to the host, the wake-up structure can trigger the host power switch to put the host into a standby state;

[0011] The medicine chamber is also provided with a hidden needle linkage mechanism, which includes a hidden needle sleeve; an injection trigger switch and an automatic drive component are provided in the host; the hidden needle linkage mechanism is configured so that when the host is in a standby state and one end of the hidden needle sleeve is subjected to force, the hidden needle linkage mechanism will move toward the host, triggering the injection trigger switch, causing the automatic drive component to move toward the medicine chamber, pushing the piston of the medicine bottle inside the medicine chamber forward to complete the injection of the medicine solution.

[0012] Furthermore, the hidden needle linkage mechanism is configured so that when the injection of the liquid medicine is completed and the needle is pulled out, the needle is hidden and confined inside the medicine chamber.

[0013] Furthermore, the awakening structure is a wake-up lever, which is arranged at one end where the medicine bin is connected to the host. When the medicine bin is installed on the host, the wake-up lever can trigger the wake-up trigger switch.

[0014] Furthermore, an automatic injection ejector rod is provided on one side of the hidden needle sleeve. When the main unit is in a standby state and one end of the hidden needle sleeve is subjected to force, the hidden needle linkage mechanism will move toward the main unit; the automatic injection ejector rod triggers the injection trigger switch, causing the automatic drive component to move toward the medicine chamber, pushing the piston of the medicine bottle inside the medicine chamber forward to complete the injection of the medicine solution.

[0015] Furthermore, the medicine bin also includes a medicine bin shell, an active sliding oblique pin is arranged inside the medicine bin shell, a sliding groove is arranged on the side wall of the hidden needle sleeve, and the active sliding oblique pin can be embedded in the sliding groove.

[0016] Furthermore, the medicine bin further comprises a medicine bin shell, a locking sleeve, a medicine bottle holder, and a locking sleeve ejector rod. An active sliding oblique pin is provided inside the medicine bin shell, and a slide groove is provided on the side wall of the hidden needle sleeve, and the active sliding oblique pin can be embedded in the slide groove.

[0017] The hidden needle sleeve is arranged inside the medicine chamber shell, and the bottom of the hidden needle sleeve extends out of the medicine chamber shell; the locking sleeve is arranged above the hidden needle sleeve, and the medicine bottle holder is arranged inside the locking sleeve, and the inside of the medicine bottle holder is used to place a pre-filled medicine bottle; the bottom of the locking sleeve and the top of the hidden needle sleeve are interlocked with each other, and the locking sleeve ejector rod is arranged above the medicine bottle holder;

[0018] Furthermore, when no injection is being performed, the locking sleeve and the hidden needle sleeve can move freely, so that the hidden needle inside the pre-filled medicine bottle can be exposed or hidden;

[0019] After the injection is completed, the locking sleeve ejector rod can lock the locking sleeve so that the hidden needle inside the pre-filled medicine bottle cannot be exposed.

[0020] Furthermore, the lower surface of the locking sleeve is provided with circumferentially uniformly distributed oblique teeth, and the upper surface of the hidden needle sleeve is provided with a sliding limit surface that cooperates with the oblique teeth, the sliding limit surface has a high point and a low point, and the connecting surface between the high point and the low point is an oblique surface; the locking sleeve is further provided with a spring, under the action of the spring, the oblique teeth can rotate along with the axial movement of the hidden needle sleeve, and the tooth tip position of the oblique teeth switches between the high point and the low point;

[0021] The locking sleeve is provided with a plurality of locking strips. In the initial state, one of the locking strips corresponds to the top rod of the locking sleeve above and below. The width of the top rod of the locking sleeve is smaller than the spacing between adjacent locking strips.

[0022] After the injection is completed, the distance between the lower surface of the locking sleeve push rod and the upper surface of one of the locking strips is set to The distance between the hidden needle inside the prefilled medicine bottle and the lower surface of the hidden needle cover is , the tooth tip height of the helical teeth is ,but < , < ;

[0023] The number of the locking sleeve push rods is 2, and the two locking sleeve push rods are respectively arranged on both sides above the medicine bottle holder;

[0024] An accommodating groove is provided on the upper side wall of the medicine bottle holder, and the locking sleeve ejector rod is provided in the accommodating groove;

[0025] A push rod oblique pin insertion hole is provided above the medicine bottle holder, and the push rod oblique pin insertion hole corresponds to the position of the locking sleeve push rod in the axial direction;

[0026] A downward groove is provided on the upper surface of the locking sleeve push rod, and the inner wall outside the groove is an inclined surface. The automatic drive component has a push rod inclined pin, and the push rod inclined pin is inserted into the groove after passing through the push rod inclined pin insertion hole.

[0027] Furthermore, the locking sleeve includes a first circular ring at the bottom and a second circular ring at the top, a plurality of locking strips are provided on the second circular ring, the outer diameter of the first circular ring is larger than the outer diameter of the second circular ring, and the bevel teeth are provided on the lower surface of the first circular ring;

[0028] The lower surface of the spring abuts against the upper surface of the first ring, and the upper surface of the spring abuts against the medicine bottle holder.

[0029] Furthermore, two guide bars are provided on the inner wall of the medicine chamber shell, and a hidden needle sleeve sliding groove is formed between the two guide bars; and an automatic injection ejector rod provided on one side of the hidden needle sleeve is embedded in the hidden needle sleeve sliding groove.

[0030] Furthermore, a hidden needle sleeve limiting strip is provided on the inner wall of the medicine chamber shell, a step is provided above the hidden needle sleeve, and the upper surface of the hidden needle sleeve limiting strip is used to limit the step.

[0031] Furthermore, an observation window is provided on the medicine chamber shell, and an observation window is also provided on the hidden needle sleeve.

[0032] Furthermore, the medicine bin also includes a medicine bin pressure cover, which is arranged on the upper end surface of the medicine bottle holder; a buckle is arranged on the inner wall above the medicine bin shell, and the buckle buckles the upper edge of the medicine bin pressure cover.

[0033] Furthermore, the medicine bottle holder includes an upper end plate and a sleeve connected to the end plate, and the sleeve is used to set the pre-filled medicine bottle; a receiving groove is set on the upper side wall of the sleeve, and the locking sleeve top rod is set in the receiving groove.

[0034] Furthermore, a limit plate is provided on the lower surface of the end plate extending downward, an opening is provided on the limit plate to avoid the locking sleeve push rod, and a limit rib is provided on the side wall of the opening; limit grooves are provided on both sides of the locking sleeve push rod, and the limit ribs are stuck in the limit grooves.

[0035] Furthermore, two limiting grooves are provided on each side of the locking sleeve push rod, and the two limiting grooves are arranged horizontally.

[0036] Furthermore, a limiting rib is provided on the inner wall of the medicine bin shell, and a limiting groove is provided on the outer edge of the medicine bottle holder, and the limiting rib is inserted into the limiting groove.

[0037] Furthermore, an annular groove is provided on the lower outer wall of the locking sleeve, a buckle is provided on the upper part of the hidden needle sleeve, and the buckle is snapped into the annular groove; a spiral groove is provided on the outer wall of the medicine bottle holder, and a thread is provided on the inner wall of the locking sleeve, and the thread is snapped into the spiral groove;

[0038] A spring is also sleeved on the outside of the locking sleeve. Under the action of the spring, the locking sleeve can move axially along with the axial movement of the hidden needle sleeve. The locking sleeve also has rotational movement while moving axially.

[0039] A spring limiting sleeve is further provided on the outside of the locking sleeve, wherein the upper surface of the spring limiting sleeve abuts against the upper edge of the medicine bottle holder, the lower surface of the spring limiting sleeve abuts against the upper side of the spring, and the lower side of the spring abuts against the hidden needle sleeve;

[0040] The locking sleeve ejector rod comprises a connecting ring and two ejector blocks, and the two ejector blocks are respectively arranged on both sides above the medicine bottle holder;

[0041] A receiving groove is provided on the upper side wall of the medicine bottle holder, and the top block is provided in the receiving groove; two buckle grooves spaced apart from each other are provided on each receiving groove, and a limiting buckle is provided on the inner side of the top block, and the limiting buckle can be snapped into the buckle groove.

[0042] Furthermore, a guide strip is provided on the inner wall of the medicine chamber shell, a guide groove is provided on the hidden needle sleeve, and the guide strip is embedded in the guide groove.

[0043] Furthermore, the medicine bin also includes a medicine bin pressure cover, which is provided on the upper end surface of the medicine bottle holder; a buckle is provided on the inner wall above the medicine bin shell, and the buckle buckles the upper edge of the medicine bin pressure cover.

[0044] Furthermore, the medicine bottle holder includes an upper end plate and a sleeve connected to the end plate, and the sleeve is used to set the pre-filled medicine bottle; and a receiving groove is set on the upper side wall of the sleeve.

[0045] Furthermore, two spiral bevels are provided above the locking sleeve. In the initial state, the top block corresponds to the top surface of one of the spiral bevels. After the injection is completed, the top block is embedded between the two spiral bevels.

[0046] Furthermore, the automatic drive assembly includes a motor and a push rod, the output shaft of the motor is a lead screw, a through hole is provided in the center of the push rod, a thread is provided on the inner wall of the through hole, the lead screw is threadedly connected to the push rod; push rod oblique pins are provided on both sides of the push rod.

[0047] Furthermore, a main board is provided on one side of the motor, a first position switch and a second position switch are provided on the main board, a trigger step is provided on the side of the push rod, and when the push rod moves along the axis, the trigger step can trigger the first position switch and the second position switch.

[0048] Furthermore, a row of equally spaced light strips is provided on the main board, and the light strips are configured to light up in sequence when the trigger step moves from the first position switch to the second position switch.

[0049] Furthermore, the main unit further comprises a middle ring and a medicine bin limiting ring, and the medicine bin limiting ring is arranged inside the middle ring;

[0050] A wake-up lever is provided on one side of the medicine bin limit ring, and a wake-up trigger switch is provided on the main board;

[0051] A sliding track is provided on the side wall of the middle ring, and the sliding track includes a starting section and an ending section, and the distance between the starting section and the wake-up trigger switch is greater than the distance between the ending section and the wake-up trigger switch;

[0052] The medicine bin is inserted into the middle ring and connected to the medicine bin limit ring, and drives the medicine bin limit ring to rotate along the inner side of the middle ring from the starting section to the ending section, so that the medicine bin is clamped in the middle ring and connected to the host. At the same time, the wake-up lever triggers the wake-up trigger switch.

[0053] Furthermore, the medicine bin limiting ring includes a second sliding convex hull and an alignment convex hull, the alignment hull is arranged at the bottom of the medicine bin limiting ring, and the second sliding convex hull is arranged outside the alignment hull;

[0054] The top of the medicine bin shell is provided with an alignment groove, the bottom of the alignment groove is provided with a first sliding convex bump, and the first sliding convex bump protrudes from the medicine bin shell;

[0055] When the medicine bin is not connected to the host, the second sliding convex bump is located at the starting section;

[0056] When the medicine bin is inserted into the middle ring and connected to the medicine bin limiting ring, the alignment convex bump is inserted into the alignment groove, and the first sliding convex bump and the second sliding convex bump are aligned along the axial direction.

[0057] Furthermore, a medicine bin insertion track is provided on the inner side wall of the middle ring. When the medicine bin is inserted into the middle ring and connected with the medicine bin limiting ring, the first sliding protrusion of the medicine bin shell is inserted into the medicine bin insertion track.

[0058] Furthermore, a tactile feedback convex bump is provided on the outer wall of the medicine bin limit ring; a first feedback groove and a second feedback groove are provided on the inner wall of the middle ring;

[0059] When the second sliding convex hull is located at the starting section, the tactile feedback convex hull is embedded in the first feedback groove;

[0060] When the second sliding convex hull is located in the terminal section, the tactile feedback convex hull is embedded in the second feedback groove.

[0061] Furthermore, the tactile feedback convex hull is a triangular convex block structure, including two asymmetric inclined thin surfaces; the angle range of the inclined thin surface in the rotational installation direction of the tactile feedback convex hull is 15°-30°; the angle range of the inclined thin surface in the rotational removal direction is 50°-70°.

[0062] In a second aspect, the present invention further provides a pen-type injector control system for an injector having a detachably connected host and a drug reservoir, comprising:

[0063] Automatic wake-up module, used to trigger the host to power on when the medicine chamber and the host are connected, so that the host enters the standby state;

[0064] The automatic injection module is used to trigger the automatic drive component to push the piston of the medicine bottle in the medicine chamber forward to complete the injection when the host enters the standby state and one end of the medicine chamber is pressed.

[0065] Furthermore, it also includes:

[0066] The injection status monitoring module is used to monitor the status of the injection trigger switch and the current status of the automatic drive component. When the injection trigger switch is in the released state or the current is abnormal, the injection status monitoring module sends a signal and controls the automatic drive component to stop injection.

[0067] Furthermore, it also includes:

[0068] Networking module, used for communication with external devices.

[0069] Furthermore, the automatic wake-up module includes a wake-up circuit unit, the wake-up circuit unit includes a wake-up trigger switch, the second contact of the wake-up trigger switch is connected to the G pole of the first MOS tube and the G pole of the second MOS tube, the S pole of the second MOS tube is connected to the power supply, and the power supply supplies power to the host; the high-voltage end of the power supply is connected to the first contact of the wake-up trigger switch.

[0070] Furthermore, the automatic injection module includes:

[0071] A skin sensing unit provided on the medicine bin is configured to be triggered when the main unit enters a standby state and one end of the medicine bin is pressed;

[0072] The automatic driving unit installed on the main unit is used to complete the injection when the skin sensing unit is triggered and reset after the needle is removed;

[0073] The injection position unit provided on the host machine is used to monitor the starting position and end position of the automatic drive unit.

[0074] Furthermore, the skin sensing unit includes a skin sensing circuit, the skin sensing circuit includes an injection trigger switch, and the injection trigger switch is connected to the MCU control unit.

[0075] Furthermore, the automatic driving unit includes an automatic driving circuit, and the automatic driving circuit includes a motor driving chip, which is connected to the MCU control unit through an IO control signal connection line and a current detection line; the motor driving chip is connected to the motor.

[0076] Furthermore, the injection position unit includes an injection position circuit, and the injection position circuit includes a first position switch and a second position switch, and the first position switch and the second position switch are both connected to the MCU control unit.

[0077] Furthermore, the networking module includes a networking module circuit, the networking module circuit includes a Bluetooth chip, the Bluetooth chip is connected to the MCU control unit, and the Bluetooth chip is also connected to an antenna, through which it can communicate with external devices.

[0078] In a third aspect, the present invention further provides a method for controlling automatic injection of a pen-type injector, which is used for an injector with a detachable connection between a host and a drug reservoir, comprising:

[0079] S1. The host receives a trigger from the wake-up structure of the medicine chamber, activates the wake-up trigger switch of the host, and puts the host into a standby state;

[0080] S2: The injection trigger switch receives a trigger signal from the hidden needle cover in the medicine chamber, and then transmits an injection signal to the MCU control unit, which drives the automatic drive component to move from the starting position to the end position to complete the injection;

[0081] S3. Based on the detection of the starting position and the end position, the light strips are sequentially lit during the movement of the automatic drive component until a sound prompt is triggered when the end position is reached;

[0082] S4: After there is no trigger signal from the injection trigger switch, the automatic drive assembly moves in the reverse direction and returns to the starting position.

[0083] Furthermore, the MCU control unit drives the automatic drive component to move from the starting position to the end position, and the injection speed can be set through the Bluetooth APP; and during the injection process, the MCU control unit monitors the motor current in real time. If the motor current is abnormal, the MCU control unit controls the motor to stop running and indicates the injection abnormality through the light strip.

[0084] Compared with the prior art, the present invention has the following beneficial effects:

[0085] The pen-type injector, control system, and automatic injection control method provided by the present invention are as follows: when the medicine chamber is connected to the host, the host automatically switches from a dormant state to a standby state; after the host switches to the standby state, pressing the end of the medicine chamber away from the host causes it to perform an injection action, and the host automatically drives the push rod to push the pre-filled medicine bottle to achieve injection; thereby achieving automatic awakening and automatic triggering of injection without the need for key operation, avoiding accidental key contact or trigger failure, and improving the safety and convenience of device use.

[0086] The pen-type injector, control system, and automatic injection control method provided by the present invention employ a locking sleeve disposed above the hidden needle sleeve. The bottom of the locking sleeve and the top of the hidden needle sleeve engage with each other. When not injecting, the locking sleeve and the hidden needle sleeve can move freely, allowing the hidden needle inside the prefilled medicine bottle to be exposed or hidden. After the injection is completed, the locking sleeve push rod can lock the locking sleeve, preventing the hidden needle inside the prefilled medicine bottle from being exposed. Furthermore, the device provided by the present invention, whether connected to a host or not, can achieve the goal of hiding the needle when not injecting without affecting the removal of the hidden needle protective cap, providing a user-friendly experience for needle-phobic users. After the injection, the hidden needle sleeve is locked to prevent the hidden needle from being exposed, preventing needle pricks and injuries to relevant personnel, improving safety of use, and preventing the drug chamber from being reused. After the injection, the needle is hidden and protected, avoiding secondary contamination, and improving the biosafety of the drug chamber.

[0087] The pen-type syringe provided by the present invention has a medicine chamber that cooperates to drive the medicine chamber limit ring to rotate along the inner side of the middle ring to achieve installation and removal; the structure is simple and the process is fast and convenient; in addition, by providing a convex bulge of a tactile feedback structure with different inclined surface angles, the force required to overcome the deformation of the elastic wall during installation is small, which is convenient for overcoming the larger force required during installation and removal, providing the user with a second different feedback on the installation force in addition to the tactile feedback, thereby improving the user's experience of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0088] Figure 1 This is an axonometric diagram of the first embodiment of the present invention;

[0089] Figure 2 This is an axonometric view of the medicine bin described in Example 1 of the present invention;

[0090] Figure 3 This is an axial exploded view of the medicine bin described in Example 1 of the present invention;

[0091] Figure 4 This is an axonometric view of the locking sleeve according to the first embodiment of the present invention;

[0092] Figure 5 This is an axonometric view of the hidden needle sleeve according to the first embodiment of the present invention;

[0093] Figure 6 This is a diagram showing the internal structure of the medicine storage housing according to the first embodiment of the present invention;

[0094] Figure 7 This is an axonometric view of the medicine bottle holder according to the first embodiment of the present invention;

[0095] Figure 8 This is an axonometric view of the medicine bottle capping according to the first embodiment of the present invention;

[0096] Figure 9 This is an axonometric view of the locking sleeve ejector rod of the first embodiment of the present invention;

[0097] Figure 10 This is an axonometric view of the initial state of the first embodiment of the present invention, in which part of the outer wall of the medicine chamber shell is hidden;

[0098] Figure 11 This is a side cross-sectional view of the medicine bin in the initial state according to the first embodiment of the present invention;

[0099] Figure 12 This is an axonometric view of the medicine bin in the second state according to the first embodiment of the present invention, wherein a portion of the outer wall of the medicine bin housing is hidden;

[0100] Figure 13 This is an axonometric view of the medicine bin in the third state according to the first embodiment of the present invention, wherein a portion of the outer wall of the medicine bin housing is hidden;

[0101] Figure 14 This is an axonometric view of the medicine bin in the fourth state according to the first embodiment of the present invention, in which the medicine bin housing is hidden;

[0102] Figure 15 This is an axial cross-sectional view of the main engine before the inclined pin of the push rod contacts the push rod of the locking sleeve in the first embodiment of the present invention;

[0103] Figure 16 This is an axial cross-sectional view of the main unit after the push rod oblique pin contacts the locking sleeve push rod in the first embodiment of the present invention;

[0104] Figure 17 This is a cross-sectional structural diagram of the locking sleeve push rod in the first position in the first embodiment of the present invention;

[0105] Figure 18 This is a cross-sectional structural diagram of the locking sleeve push rod in the first position in the first embodiment of the present invention;

[0106] Figure 19 This is an axonometric view of the medicine bin in the fifth state according to the first embodiment of the present invention, wherein a portion of the outer wall of the medicine bin housing is hidden;

[0107] Figure 20 This is an axonometric view of the medicine bin in the sixth state according to the first embodiment of the present invention, wherein a portion of the outer wall of the medicine bin housing is hidden;

[0108] Figure 21a This is a schematic diagram of the internal structure of the host computer according to the present invention;

[0109] Figure 21b A schematic diagram showing the internal structure of the host according to the present invention from another angle;

[0110] Figure 22 This is a schematic structural diagram of the medicine bin limiting ring of the present invention;

[0111] Figure 23This is a schematic diagram of the external structure of the middle ring of the present invention;

[0112] Figure 24 This is a schematic diagram of the internal structure of the middle ring of the present invention;

[0113] Figure 25 This is a schematic structural diagram of the host housing of the present invention;

[0114] Figure 26 A partial isometric view of the alignment groove and the alignment protrusion in the initial state of the present invention (with the main body housing hidden);

[0115] Figure 27 A partial axonometric diagram of the alignment groove and the alignment protrusion in the initial state of the present invention (with the main body housing and the middle ring hidden);

[0116] Figure 28 This is a partial axonometric diagram of the medicine bin and the main unit after the medicine bin and the main unit are installed, when the medicine bin and the medicine bin limit ring rotate to the end section (the main unit housing is hidden);

[0117] Figure 29 This is a partial cross-sectional view of the main machine when the medicine bin limiting ring arranged in the middle ring of the present invention is in the starting section;

[0118] Figure 30 This is a partial cross-sectional view of the main machine when the medicine bin limiting ring arranged in the middle ring of the present invention is in the terminal section;

[0119] Figure 31 A diagram showing the position of the automatic injection ejector when the injection trigger switch is triggered;

[0120] Figure 32 This is an axonometric view of the medicine bin described in Example 2 of the present invention;

[0121] Figure 33 This is an axonometric view of a locking sleeve according to a second embodiment of the present invention;

[0122] Figure 34 This is an axonometric view of the hidden needle sleeve according to the second embodiment of the present invention;

[0123] Figure 35 This is a diagram showing the internal structure of the medicine bin housing according to the second embodiment of the present invention;

[0124] Figure 36 This is an axonometric view of a medicine bottle holder according to a second embodiment of the present invention;

[0125] Figure 37 This is an axonometric view of the locking sleeve ejector rod of the second embodiment of the present invention;

[0126] Figure 38 This is an axonometric view of the initial state of the medicine bin according to the second embodiment of the present invention, in which the medicine bin housing and the spring limiting sleeve are hidden;

[0127] Figure 39 This is an axonometric view of the medicine bin in the second state according to the second embodiment of the present invention, in which the medicine bin housing and the spring limiting sleeve are hidden;

[0128] Figure 40 This is an axonometric view of the medicine bin in the third state according to the second embodiment of the present invention, in which the medicine bin housing and the spring limiting sleeve are hidden;

[0129] Figure 41 This is an axonometric view of the medicine bin in the fourth state according to the second embodiment of the present invention, in which the medicine bin housing and the spring limiting sleeve are hidden;

[0130] Figure 42 This is an axial exploded view of the second embodiment of the present invention;

[0131] Figure 43 This is a circuit diagram of the automatic wake-up module in the third embodiment of the present invention;

[0132] Figure 44 This is a schematic diagram of a skin sensing circuit in Embodiment 3 of the present invention;

[0133] Figure 45 This is a schematic diagram of the automatic driving circuit in the third embodiment of the present invention;

[0134] Figure 46 This is a schematic diagram of the injection position circuit in the third embodiment of the present invention;

[0135] Figure 47 This is a circuit schematic diagram of the networking module in Example 3 of the present invention.

[0136] Description of reference numerals:

[0137] 1. Hidden needle sleeve, 101. Sliding limit surface, 102. Slide groove, 103. Automatic injection ejector, 104. Buckle, 105. Guide groove;

[0138] 2. Medicine chamber housing, 201. Active sliding oblique pin, 202. Guide bar, 203. Hidden needle sleeve sliding groove, 204. Hidden needle sleeve limiting strip, 205. Observation window, 206. Buckle [fine 1], 207. Limiting rib, 208. First sliding convex hull, 209. Alignment groove;

[0139] 3. Locking sleeve, 301. Bevel teeth, 302. Locking strip, 303. Annular groove, 304. Thread, 305. Spiral bevel, 3511. Bottom surface, 3512. Top surface;

[0140] 4. Medicine bottle holder, 401. End plate, 402. Sleeve, 403. Accommodation groove, 404. Push rod oblique pin insertion hole, 405. Limiting rib, 406. Limiting groove, 407. Spiral groove, 408. Buckle groove,

[0141] 5. Spring,

[0142] 6. Locking sleeve push rod, 601, groove, 602, inclined surface, 603, limit groove, 604, top block, 605, limit buckle,

[0143] 7. Medicine chamber pressure cover, 701. Movable groove, 702. Mounting surface, 703. Push rod insertion hole, 704. Push rod oblique pin insertion hole,

[0144] 8. Pre-filled medicine bottle, 9. Push rod, 901. Trigger step, 10. Push rod oblique pin, 11. Spring limit sleeve, 12. Main unit housing, 1201. Middle ring limit groove;

[0145] 13. Main board, 14. Injection trigger switch, 15. First position switch, 16. Second position switch, 17. Motor;

[0146] 18. Middle ring, 1801. Sliding track, 1811. Starting section, 1812. Transition section, 1813. End section, 1802. Medicine chamber insertion track, 1803. First feedback groove, 1804. Second feedback groove, 1805. Connection stop surface, 1806. Wake-up lever avoidance groove, 1807. Middle ring limiting rib;

[0147] 19. Medicine chamber limit ring, 1901. Wake-up lever, 1902. Second sliding convex hull, 1903. Alignment convex hull, 1904. Tactile feedback convex hull, 1905. Limit ring stop surface;

[0148] 20. Wake-up trigger switch, 21. Power supply, 22. Main bracket. DETAILED DESCRIPTION

[0149] The technical solution of the present invention will be clearly described below in conjunction with the accompanying drawings. Obviously, the described embodiments are not all embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0150] It should be noted that, unless otherwise specifically stated, the relative arrangements of components and steps, and numerical expressions set forth in these embodiments should not be construed as limiting the scope of the present invention.

[0151] The following description of exemplary embodiments is merely illustrative and is not intended to limit the present invention, its application, or use in any sense. Technologies, methods, and apparatus known to those skilled in the art may not be discussed in detail herein, but to the extent applicable, such technologies, methods, and apparatuses should be considered part of this specification.

[0152] Example 1

[0153] This embodiment provides a pen-type injector, such as Figure 1 As shown, it includes a medicine bin and a main unit, wherein a pre-filled medicine bottle is arranged inside the medicine bin, and one end of the medicine bin is detachably connected to one end of the main unit; a push rod 9 is arranged inside the main unit;

[0154] When the medicine bin is connected to the host, the host automatically switches from a dormant state to a standby state;

[0155] After the host is switched to the standby state, the end of the medicine chamber away from the host is pressed to make it perform an injection action, and the host automatically drives the push rod 9 to push the pre-filled medicine bottle to achieve injection.

[0156] like Figure 3 As shown, the medicine chamber includes the hidden needle sleeve 1, and an automatic injection ejector rod 103 is provided on one side of the hidden needle sleeve 1; a main board 13 is provided in the host, and an injection trigger switch 14 is provided on the main board 13. When the medicine chamber is connected to the host, the automatic injection ejector rod 103 corresponds to the position of the injection trigger switch 14; when the end of the medicine chamber away from the host is pressed to perform an injection action, the automatic injection ejector rod 103 triggers the injection trigger switch 14, so that the host automatically drives the push rod 9 to push the pre-filled medicine bottle.

[0157] like Figure 2 and Figure 3 The figure shows the structure of the medicine chamber, which includes a hidden needle sleeve 1, a medicine chamber shell 2, a locking sleeve 3, a medicine bottle holder 4, a locking sleeve push rod 6, a medicine chamber pressure cover 7, and a reset element. The medicine chamber shell 2 is a structural component with a through hole inside. The hidden needle sleeve 1 is arranged inside the medicine chamber shell 2, and the hidden needle sleeve 1 extends out from the medicine chamber shell 2 below; the locking sleeve 3 is arranged above the hidden needle sleeve 1, and the medicine bottle holder 4 is arranged inside the locking sleeve 3. The medicine bottle holder 4 has a through hole inside, and the inside is used to set a pre-filled medicine bottle 8; the medicine chamber pressure cover 7 is arranged above the medicine bottle holder 4, and the medicine chamber pressure cover 7 is used to compress the pre-filled medicine bottle 8.

[0158] The bottom of the locking sleeve 3 and the top of the hidden needle sleeve 1 are engaged with each other, and the locking sleeve push rod 6 is provided above the medicine bottle holder 4;

[0159] Furthermore, when no injection is being performed, the locking sleeve 3 and the hidden needle sleeve 1 can move freely, so that the hidden needle inside the pre-filled medicine bottle 8 can be exposed or hidden;

[0160] After the injection is completed, the locking sleeve push rod 6 can lock the locking sleeve 3 so that the hidden needle inside the pre-filled medicine bottle 8 cannot be exposed.

[0161] The entire drug reservoir is a disposable packaging material. When not injecting, the hidden needle shield 1 is free to move, allowing for removal of the needle guard, abnormal activation, and simultaneous needle insertion. After the injection is complete, the locking sleeve 3 is locked, preventing the hidden needle shield 1 from moving freely, preventing the hidden needle inside the pre-filled vial 8 from being exposed. This prevents the operator from being pricked by the hidden needle and reduces the risk of the device being reused.

[0162] like Figure 4 The figure shows the structure of the locking sleeve 3. The locking sleeve 3 comprises a first circular ring at the bottom and a second circular ring at the top. The first circular ring has a larger outer diameter than the second circular ring. The lower surface of the first circular ring is provided with beveled teeth 301, all tilted toward the same side. The upper surface of the second circular ring is provided with a plurality of upwardly extending locking bars 302. In this embodiment, there are six locking bars 302 on the second circular ring. Each bar 302 is of the same size and is evenly spaced along the circumference.

[0163] Furthermore, the oblique teeth 301 of the locking sleeve 3 correspond to the positions of the locking strip 302 , that is, the tooth tips of the oblique teeth 301 are almost aligned with the left side wall of the locking strip 302 .

[0164] like Figure 5 The diagram shows the structure of the hidden needle sleeve 1. The upper surface of the hidden needle sleeve 1 is provided with a sliding stop surface 101 that mates with the beveled teeth 301. The sliding stop surface 101 has high points and low points, and the connecting surface between the high points and the low points is an inclined surface. As a result, the sliding stop surface 101 is a surface with alternating high points and low points, each low point corresponding to a beveled tooth 301. A sliding groove 102 is also provided on the upper side wall of the hidden needle sleeve 1. Furthermore, an automatic injection ejector 103 is also provided on the upper side wall of the hidden needle sleeve 1. The automatic injection ejector 103 mates with the main unit to activate the automatic injection function in the main unit. To facilitate observation of the drug injection process within the hidden needle sleeve 1, an observation window is also provided on the side wall of the hidden needle sleeve 1.

[0165] like Figure 6 This is a diagram of the structure of the drug reservoir housing 2. The upper half of the housing 2 is annular, while the inner diameter of the lower half gradually decreases to match the outer diameter of the hidden needle sleeve 1. Two guide bars 202 are provided on the inner wall of the housing 2, with a hidden needle sleeve sliding groove 203 formed between them. The automatic injection ejector rod 103 of the hidden needle sleeve 1 is embedded in the hidden needle sleeve sliding groove 203. Therefore, while the hidden needle sleeve 1 can freely move up and down, the automatic injection ejector rod 103 is confined within the hidden needle sleeve sliding groove 203, so the hidden needle sleeve 1 can only move axially along the housing 2 and cannot rotate.

[0166] An active sliding oblique pin 201 is also provided on the inner wall of the drug reservoir housing 2. The active sliding oblique pin 201 can be inserted into the sliding groove 102 of the hidden needle sleeve 1. When not injecting, the upper surface of the active sliding oblique pin 201 abuts the inclined surface of the beveled teeth 301 of the locking sleeve 3, and the side surface of the active sliding oblique pin 201 abuts the approximately vertical surface of the beveled teeth 301 of the locking sleeve 3.

[0167] In this embodiment, three active sliding oblique pins 201 are provided along the circumferential direction, and the three active sliding oblique pins 201 are evenly distributed.

[0168] A plurality of hidden needle sheath retaining strips 204 are further provided on the inner wall of the medicine chamber housing 2. The plurality of hidden needle sheath retaining strips 204 are arranged along the circumference of the medicine chamber housing 2. The outer diameter of the upper portion of the hidden needle sheath 1 is larger than the outer diameter of the lower portion, forming a step. The upper surface of the hidden needle sheath retaining strips 204 is used to retain the step, thereby preventing the hidden needle sheath 1 from falling out from the bottom of the medicine chamber housing 2.

[0169] An observation window 205 is also provided on the medicine chamber housing 2. The observation window 205 on the medicine chamber housing 2 corresponds to the observation window on the hidden needle sleeve 1. Therefore, the pre-filled medicine bottle 8 inside can be directly observed through the observation window.

[0170] A buckle 206 is provided on the inner wall above the medicine bin housing 2 , and the buckle 206 buckles the upper edge of the medicine bin pressure cover 7 so that the medicine bin pressure cover 7 is tightly mounted on the medicine bin housing 2 .

[0171] like Figure 7 The diagram shows the structure of the medicine bottle holder 4. The medicine bottle holder 4 includes an upper end plate 401 and a sleeve 402 connected to the end plate 401. The sleeve 402 is used to accommodate a pre-filled medicine bottle 8. The upper side wall of the sleeve 402 is provided with a receiving groove 403, and the locking sleeve ejector rod 6 is disposed in the receiving groove 403. There are two locking sleeve ejector rods 6, one on each side of the upper side of the medicine bottle holder 4.

[0172] A push rod oblique pin insertion hole 404 is provided above the end plate 401, axially corresponding to the locking sleeve push rod 6. The main unit connected to the device of this embodiment includes a push rod 9, flanked by oblique push rod pins 10. During injection, the push rod 9 is inserted into the central through-hole of the vial holder 4 to push the liquid medicine in the prefilled vial 8. The push rod pins 10 are inserted into the push rod oblique pin insertion hole 404 to lock the locking sleeve 3.

[0173] A side of the end plate 401 is provided with an escape groove to clear the automatic injection ejector rod 103 of the hidden needle sleeve. Furthermore, a limit groove is provided on the edge of the end plate 401, which cooperates with the limit ribs on the inner wall of the medicine chamber shell to limit the rotation of the medicine bottle holder. Two bumps are also provided on the upper surface of the end plate 401. A cover plate is provided above the prefilled medicine bottle 8. The cover plate has two flat sides and is embedded between the two bumps to limit the rotation of the prefilled medicine bottle 8. The cover plate of the prefilled medicine bottle 8 is covered by the medicine chamber pressure cap 7 to secure the prefilled medicine bottle 8.

[0174] A limit plate is provided on the lower surface of the end plate 401 and extends downward. An opening is provided on the limit plate to avoid the locking sleeve push rod 6 .

[0175] like Figure 8 The figure shows the structure of the medicine chamber pressure cover 7. The center of the medicine chamber pressure cover 7 has a push rod insertion hole 703 for inserting the push rod 9; push rod oblique pin insertion holes 704 are set on both sides of the push rod insertion hole 703. The push rod oblique pin insertion holes 704 of the medicine chamber pressure cover 7 correspond to the push rod oblique pin insertion holes 404 of the medicine bottle holder 4, and both are used for inserting the push rod oblique pin 10.

[0176] A movable groove 701 is also provided on one side of the medicine chamber pressure cover 7 for avoiding the automatic injection ejector rod 103 of the hidden needle sleeve 1. The outer edge of the medicine chamber pressure cover 7 has a step, and the step surface is the mounting surface 702. The buckle 206 of the medicine chamber shell 2 buckles the mounting surface 702, thereby realizing the assembly of the medicine chamber pressure cover 7.

[0177] like Figure 9 The figure shows the structure of the locking sleeve push rod 6. A downward groove 601 is provided on the upper surface of the locking sleeve push rod 6. The inner wall outside the groove 601 is a slope 602. The push rod inclined pin 10 is inserted into the groove 601 after passing through the push rod inclined pin insertion hole 704 of the medicine chamber pressure cover 7 and the push rod inclined pin insertion hole 404 of the medicine bottle holder 4 in sequence, and the lower surface of the push rod inclined pin 10 squeezes the slope 602 to move the locking sleeve push rod 6 outward.

[0178] Limiting ribs 405 are provided on the sidewalls of the opening of the medicine bottle holder 4; limiting grooves 603 are provided on both sides of the locking sleeve push rod 6. The limiting ribs 405 are snapped into the limiting grooves 603 to limit the locking sleeve push rod 6. Two limiting grooves 603 are provided on each side of the locking sleeve push rod 6, and the two limiting grooves 603 are arranged horizontally. The two limiting grooves 603 correspond to the two position states of the locking sleeve push rod 6:

[0179] Position 1: The limiting rib 405 is inserted into the limiting groove 603 on the outer side of the locking sleeve push rod 6;

[0180] Position 2: The limiting rib 405 is inserted into the limiting groove 603 on the inner side of the locking sleeve push rod 6;

[0181] The inner side and the outer side are respectively based on the radial direction of the medicine bottle holder 4 , the inner side is close to the central axis of the medicine bottle holder 4 , and the outer side is far from the central axis of the medicine bottle holder 4 .

[0182] The lower part of the locking sleeve top rod 6 is a rod-shaped structure, such as Figure 10 The figure shows the initial state of the device of this embodiment when it is not in use. At this time, one of the locking strips 302 of the locking sleeve 3 corresponds to the locking sleeve push rod 6 in upper and lower positions; and the width of the locking sleeve push rod 6 is smaller than the distance between adjacent locking strips 302.

[0183] The beveled teeth 301 of the locking sleeve 3 are caught on the active sliding beveled pin 201, which is embedded in the sliding groove 102 of the hidden needle sleeve 1. The beveled teeth 301 abut against the sliding limit surface 101 of the hidden needle sleeve 1, but the tooth tips of the beveled teeth 301 are not at the lowest point of the sliding limit surface 101. However, due to the restraint of the active sliding beveled pin 201, the locking sleeve 3 and the hidden needle sleeve 1 are in a stable state.

[0184] A reset element is further sleeved on the outside of the locking sleeve 3. Under the action of the reset element, the bevel teeth 301 can rotate along with the axial movement of the hidden needle sleeve 1, and the tooth tip position of the bevel teeth 301 switches between the high point and the low point.

[0185] The reset element is preferably a spring 5. The lower surface of the spring 5 abuts against the upper surface of the first ring, and the upper surface of the spring 5 abuts against the medicine bottle holder 4.

[0186] like Figure 11 The figure shows the internal structure of the device in the initial state. The outer wall of the rod-shaped structure below the locking sleeve push rod 6 is flush with the outer wall of the medicine bottle holder 4. At this time, the hidden needle sleeve 1 is pushed upward from the lower surface. When the tooth tip of the inclined tooth 301 of the locking sleeve 3 is just higher than the active sliding inclined pin 201, the initial state is switched to the second state. Figure 12 shown.

[0187] Figure 12 In the second state shown, due to the rebound effect of the spring 5, the locking sleeve 3 is prompted to move downward, and the tooth tip of the bevel tooth 301 abuts the sliding limit surface 101 of the hidden needle sleeve 1, and the tooth tip is not located at the low point of the sliding limit surface 101. Therefore, the tooth tip tends to move toward the low point, and the locking sleeve 3 moves downward and rotates under the action of the spring.

[0188] After the movement, the second state switches to Figure 13In the third state shown, the tooth tip of the bevel tooth 301 moves to the lowest point of the sliding limit surface 101. However, since the side of the bevel tooth 301 is not blocked by the active sliding bevel pin 201, the locking sleeve 3 still has a tendency to rotate. Therefore, under the action of the spring 5, the locking sleeve 3 continues to rotate until it returns to the Figure 10 The initial state shown is that, when no injection is given, the locking sleeve 3 and the hidden needle sleeve 1 can move freely.

[0189] When the hidden needle sleeve 1 is retracted a large distance in the medicine chamber shell, such as Figure 14 As shown, when the hidden needle sleeve 1 starts to move upward from the initial state, it first switches to Figure 12 The second state shown in FIG. 1 is then continued to move upward, and the tip of the helical tooth 301 moves to the lowest point of the sliding limit surface 101, and then switches to Figure 14 In the fourth state shown, the locking sleeve 3 has rotated a certain angle relative to the initial state. The locking strip 302 of the locking sleeve 3 and the locking sleeve push rod 6 are now offset, and the space between the locking sleeve push rod 6 and the locking strip 302 is aligned. The hidden needle cover 1 continues to move upward, and the locking sleeve push rod 6 is inserted into the space between the locking strips 302. This fully exposes the needle guard, allowing removal of the needle guard.

[0190] If the device of this embodiment is associated with a host, then Figure 10 In the state shown, during injection, the hidden needle sheath 1 retracts inward (moves upward) due to the obstruction of the skin, and the automatic injection ejector rod 103 of the hidden needle sheath 1 moves upward and extends out of the medicine chamber pressure cover 7, and the automatic injection ejector rod 103 triggers the injection function of the host. Figure 15 The figure shows an axial cross-sectional view of the push rod oblique pin 10 in the main unit before contact with the locking sleeve push rod 6. After the injection function of the main unit is triggered, the push rod 9 starts to move downward, and the push rod oblique pins 10 on both sides of the push rod 9 pass through the push rod oblique pin insertion hole 704 of the medicine chamber pressure cover 7 and the push rod oblique pin insertion hole 404 of the medicine bottle holder 4 in turn, and then are inserted into the groove 601 of the locking sleeve push rod 6.

[0191] like Figure 16 As shown, the push rod oblique pin 10 continues to descend, and the lower surface of the push rod oblique pin 10 is an inclined surface that cooperates with the inclined surface 602 of the locking sleeve push rod 6. The inclined surface of the push rod oblique pin 10 pushes the locking sleeve push rod 6 outward, causing the locking sleeve push rod 6 to move outward, so that the locking sleeve push rod 6 moves from position one to position two.

[0192] like Figure 17 The cross-sectional structure diagram at position 1 is shown as follows. Figure 18The figure shows the cross-sectional structure at position 2. When the locking sleeve push rod 6 is in position 1, the limiting rib 405 of the medicine bottle holder 4 is located in the limiting groove 603 on the outer side of the locking sleeve push rod 6. As the locking sleeve push rod 6 moves outward, the limiting rib 405 of the medicine bottle holder 4 gradually moves into the limiting groove 603 on the inner side of the locking sleeve push rod 6.

[0193] When the locking sleeve push rod 6 moves outward to position 2, the locking sleeve push rod 6 protrudes relative to the outer wall of the medicine bottle holder 4. During the outward movement of the locking sleeve push rod 6, the push rod 9 pushes the medicine liquid downward to complete the injection process.

[0194] After the injection is completed, the device of this embodiment is pulled out, and the needle is exposed. At the same time, the locking sleeve 3 moves downward under the action of the spring 5, switching to Figure 19 In the fifth state shown, as the locking sleeve 3 continues to move, the relative positions of the locking sleeve 3 and the hidden needle sleeve 1 are restored to Figure 10 However, the position of the locking sleeve push rod 6 has changed at this time. It slides outward from the receiving groove 403 of the medicine bottle holder 4, so that the lower surface of the locking sleeve push rod 6 is arranged opposite to the locking strip 302 of the locking sleeve 3, and the locking sleeve 3 is switched to the stable state shown in FIG. Figure 20 The sixth state is shown.

[0195] Moreover, the relative positions of the locking sleeve 3 and the hidden needle sleeve 1 are restored to Figure 10 After reaching the stable state shown, the hidden needle cover 1 conceals the hidden needle. Meanwhile, if the hidden needle cover 1 is further pressed upward, the locking cover 3 is blocked by the locking cover push rod 6, so that the tips of the bevel teeth 301 of the locking cover 3 cannot be higher than the active sliding bevel pin 201. Therefore, the locking cover 3 cannot move further upward or rotate. It can be considered that the hidden needle cover 1 and the locking cover 3 are in a locked state at this time, providing effective anti-puncture protection for the needle.

[0196] In addition, after the injection is completed; set the distance between the lower surface of the locking sleeve push rod 6 and the upper surface of one of the locking strips 302 to The distance between the hidden needle inside the pre-filled medicine bottle 8 and the lower surface of the hidden needle cover 1 is , the tooth tip height of the helical tooth 301 is ,but < , < .

[0197] like Figure 21a and Figure 21bThe figure shows the internal structure of the host, which includes a main bracket 22, a motor 17 is installed above the main bracket 22, and an output shaft is provided below the motor 17, and the output shaft of the motor 17 is a screw; the screw is threadedly connected to the push rod 9, a through hole is provided in the center of the push rod 9, and a thread is provided on the inner wall of the through hole, and the screw is threadedly connected to the push rod 9 through the through hole.

[0198] A main board 13 is provided on one side of the main bracket, and a power supply 21 is provided on the other side of the main bracket 22 . The power supply 21 is used to supply power to the main board 13 and the motor 17 .

[0199] A first position switch 15 and a second position switch 16 are provided on a side of the main board 13 close to the push rod 9 , and a trigger step 901 is provided on the surface of the push rod 9 . When the push rod 9 moves along the axis, the trigger step 901 can trigger the first position switch 15 and the second position switch 16 .

[0200] In addition, an injection trigger switch 14 is provided below a side of the main board 13 close to the push rod 9 , and a wake-up trigger switch 20 is provided below a side of the main board 13 away from the push rod 9 .

[0201] A middle ring 18 and a medicine bin limiting ring 19 are provided below the main support 22, and the medicine bin limiting ring 19 is provided inside the middle ring 18;

[0202] The medicine bin is inserted into the middle ring 18 and connected to the medicine bin limiting ring 19, and drives the medicine bin limiting ring 19 to rotate along the inner side of the middle ring 18 from the starting position to the end position, so that the medicine bin is clamped in the middle ring 18 and connected to the host.

[0203] like Figure 2 As shown, a positioning groove 209 is provided on the top of the medicine chamber shell 2, and a first sliding convex bump 208 is provided at the bottom of the positioning groove 209, and the first sliding convex bump 208 protrudes from the medicine chamber shell 2; the positioning groove 209 and the first sliding convex bump 208 are symmetrically arranged in two groups with the center of the medicine chamber shell as the center of the circle.

[0204] like Figure 22 As shown, the medicine bin limiting ring 19 includes a second sliding convex hull 1902 and an alignment convex hull 1903. The alignment convex hull 1903 is provided at the bottom of the medicine bin limiting ring 19, and the second sliding convex hull 1902 is provided on the outer side of the alignment convex hull 1903.

[0205] The shape and position of the alignment convex bump 1903 match the shape and position of the alignment groove 209 .

[0206] During actual installation, the medicine bin is inserted into the middle ring 18, and the alignment bulge 1903 of the medicine bin limit ring 19 is clamped in the alignment groove 209 of the medicine bin outer shell 2. Rotating the medicine bin can drive the medicine bin limit ring 19 to rotate. At this time, the first slider bulge 208 is in contact with the second slider bulge 1902.

[0207] Combine Figure 23 、 Figure 24 As shown, the side wall of the middle ring 18 is provided with a sliding track 1801, the inner side of the side wall of the middle ring 18 is provided with a medicine chamber insertion track 1802, and the top of the inner side of the middle ring 18 is provided with a threaded connection stop surface 1805; the sliding track 1801 includes a starting section 1811, and the medicine chamber insertion track 1802 is connected to the starting section 1811;

[0208] The outer wall of the top of the medicine bin limiting ring 19 is also provided with a threaded limiting ring stop surface 1905, and the medicine bin limiting ring 19 is threadedly connected to the middle ring 18 through the limiting ring stop surface 1905, and in the initial state, the second sliding bulge 1902 extends into the starting section 1811 of the sliding track 1801.

[0209] The limiting ring stop surface 1905 and the connecting stop surface 1805 are spiral surfaces.

[0210] The sliding track 1801 further includes a transition section 1812 and a terminal section 1813 ; the terminal section 1813 is positioned higher than the starting section 1811 , and the terminal section 1813 is connected to the starting section 1811 via the inclined transition section 1812 .

[0211] like Figures 26 to 28 As shown, during actual installation, the first slider convex 208 is inserted into the middle ring 18 along the medicine magazine insertion track 1802, and the alignment convex 1903 of the medicine magazine limit ring 19 is clamped in the alignment groove 209 of the medicine magazine shell 2. Rotating the medicine magazine can drive the medicine magazine limit ring 19 to rotate along the sliding track 1801.

[0212] Since the inner wall thickness of the middle ring 18 is thicker than the wall thickness of the medicine magazine insertion track 1802, after rotating out of the starting section 1811, the medicine magazine can be clamped in the transition section 1812 or the terminal section 1813 of the sliding track 1801 through the first sliding protrusion 208; when continuing to rotate, due to the threaded connection relationship between the middle ring 18 and the medicine magazine limit ring 19, the position of the medicine magazine shell 2 and the medicine magazine limit ring 19 will gradually increase compared to the middle ring 18 until it is fixed after rotating to the terminal section 1813. At this time, the limit ring stop surface 1905 of the medicine magazine limit ring 19 and the connection stop surface 1805 of the middle ring 18 are in a tightly tightened state.

[0213] Combine Figure 29 and Figure 30As shown, the pen-type injector further includes a tactile feedback mechanism, which includes a tactile feedback convex 1904 and a tactile feedback groove;

[0214] The tactile feedback convex 1904 is an elastic structure, and is provided on the outer wall of the medicine chamber limiting ring 19; the shape of the tactile feedback convex 1904 matches the shape of the tactile feedback groove;

[0215] The tactile feedback groove includes a first feedback groove 1803 and a second feedback groove 1804. When the second sliding bulge 1902 of the medicine chamber limiting ring 19 is located in the starting section 1811, the first feedback groove 1803 is set at the inner wall of the middle ring 18 corresponding to the tactile feedback bulge 1904; when the second sliding bulge 1902 of the medicine chamber limiting ring 19 is located in the ending section 1813, the second feedback groove 1804 is set at the inner wall of the middle ring 18 corresponding to the tactile feedback bulge 1904.

[0216] The tactile feedback convex bump 1904 is a triangular convex block structure, including two asymmetrical inclined thin surfaces.

[0217] The angle of the inclined thin surface of the tactile feedback convex bump 1904 in the rotational installation direction ranges from 15° to 30°; the angle of the inclined thin surface in the rotational removal direction ranges from 50° to 70°.

[0218] The tactile feedback mechanism is designed as a partially thin-walled elastic structure that deforms during movement. The clockwise installation bevel is set at a shallow, acute angle, requiring less force to overcome the elastic wall deformation. The counterclockwise removal bevel is set at a steeper, acute angle, requiring greater force to be overcome. This provides users with a second, different type of installation force feedback in addition to tactile feedback, enhancing user experience.

[0219] like Figure 27 and Figure 28 As shown, the pen-type injector also activates a feedback structure, which includes a wake-up lever 1901, a wake-up trigger switch 20, and a buzzer. The wake-up trigger switch 20 and the buzzer are provided on the main board 13. The top of the middle ring 18 is provided with a wake-up lever avoidance groove 1806. The wake-up lever 1901 is provided on the medicine chamber limit ring 19 and extends out of the wake-up lever avoidance groove 1806.

[0220] The wake-up trigger switch 20 is located at the end position of the movement of the wake-up lever 1901 .

[0221] When the medicine chamber drives the medicine chamber limit ring 19 to rotate from the starting section 1811 to the ending section 1813, the wake-up lever 1901 just toggles the wake-up trigger switch 20. The function of the wake-up trigger switch 20 is to wake up the host in the dormant state and put it into the injection state. Synchronously, the buzzer set on the host sounds to remind the user that the medicine chamber is installed in place.

[0222] like Figure 25 As shown, the host also includes a host housing 12, the inner wall of the host housing 12 is provided with a middle ring limiting groove 1201, the outer wall of the middle ring 18 is provided with a middle ring limiting rib 1807 that cooperates with the middle ring limiting groove 1201, and the middle ring 18 and the host housing 12 are fixed by ultrasonic welding.

[0223] The operation process of the pen-type injector provided in this embodiment is as follows:

[0224] First, the medicine bin is connected to the host. After the medicine bin and the host are connected and locked, the host switches from a dormant state to an awake standby state.

[0225] Then, the needle protection cap is removed, and the pen-type syringe is held to complete the injection action and perform the injection. During the injection process, after the patient completes the injection action with the injection pen, the hidden needle cover 1 set on the medicine chamber moves axially toward the main unit, and the automatic injection ejector rod 103 triggers the injection trigger switch 14.

[0226] Afterwards, the host drives the push rod 9 to move linearly axially toward the medicine chamber through the motor 17, pushing the piston of the pre-filled medicine bottle to complete the injection action. The motor 17 drives the push rod 9 from the starting position to the end position.

[0227] At the same time, the light strips on the main unit light up one by one to indicate the progress of the injection. When the injection is complete and the entire injection is complete, the light strips all light up. A buzzer on the main unit also sounds to indicate that the injection is complete. This serves as a double reminder to the user that the injection is complete and the needle can be removed.

[0228] The needle is then pulled out, and after the needle is pulled out, the motor 17 drives the lead screw to reverse, so that the push rod 9 returns to the starting position.

[0229] Remove the medicine chamber and release the wake-up trigger switch 20, and the device will automatically power off.

[0230] Example 2

[0231] The difference between this embodiment and the first embodiment lies in the internal structure of the medicine bin, and the rest of the structures are the same.

[0232] The medicine storage structure of this embodiment is as follows Figure 32 and Figure 42As shown, the medicine chamber includes a hidden needle sleeve 1, a medicine chamber shell 2, a locking sleeve 3, a medicine bottle holder 4, a locking sleeve push rod 6, a medicine chamber pressure cover 7, and a reset element. The medicine chamber shell 2 is a structural component with a through hole inside. The hidden needle sleeve 1 is arranged inside the medicine chamber shell 2, and the hidden needle sleeve 1 extends out from the medicine chamber shell 2 below; the locking sleeve 3 is arranged above the hidden needle sleeve 1, and the medicine bottle holder 4 is arranged inside the locking sleeve 3. The medicine bottle holder 4 has a through hole inside, and the inside is used to set a pre-filled medicine bottle 8; the medicine chamber pressure cover 7 is arranged above the medicine bottle holder 4, and the medicine chamber pressure cover 7 is used to compress the pre-filled medicine bottle 8.

[0233] The bottom of the locking sleeve 3 and the top of the hidden needle sleeve 1 are engaged with each other, and the locking sleeve push rod 6 is provided above the medicine bottle holder 4;

[0234] Furthermore, when no injection is being performed, the locking sleeve 3 and the hidden needle sleeve 1 can move freely, so that the hidden needle inside the pre-filled medicine bottle 8 can be exposed or hidden;

[0235] After the injection is completed, the locking sleeve push rod 6 can lock the locking sleeve 3 so that the hidden needle inside the pre-filled medicine bottle 8 cannot be exposed.

[0236] The overall device, which provides hidden needle and post-injection needle protection, is a disposable pharmaceutical packaging material. When not injecting, the hidden needle cover 1 is free to move, allowing for removal of the needle cover, abnormal activation, and needle insertion, which retracts the hidden needle cover 1 to expose the needle, while also completing the needle insertion procedure. After the injection is completed, the locking sleeve 3 is locked, preventing the hidden needle cover 1 from moving freely, preventing the hidden needle inside the prefilled vial 8 from being exposed. This prevents the operator from being pricked by the hidden needle and reduces the risk of the device being reused.

[0237] like Figure 33 The figure shows the structure of the locking sleeve 3. The locking sleeve 3 is cylindrical in shape, with an annular groove 303 provided on the lower outer wall of the locking sleeve 3. A spiral slope 305 is provided on the upper surface of the locking sleeve 3. In this embodiment, two spiral slopes 305 are provided, each having a bottom surface 3511 and a top surface 3512. Furthermore, a thread 304 is provided on the inner wall of the locking sleeve 3. The spiral direction of the thread 304 is the same as that of the spiral slope 305.

[0238] like Figure 34 The structure of the hidden needle cover 1 is shown. A buckle 104 is provided on the top of the hidden needle cover 1, and the buckle 104 is snapped into the annular groove 303. An automatic injection ejector rod 103 is also provided on the top of the hidden needle cover 1. The automatic injection ejector rod 103 cooperates with a host to activate the automatic injection function of the host. The host is an electronic injection pen that cooperates with the device for providing hidden needle and post-injection needle puncture protection of this embodiment.

[0239] In addition, a guide groove 105 is provided on the edge above the hidden needle sleeve 1 for matching with the medicine chamber shell 2.

[0240] like Figure 35 The diagram shows the structure of the drug housing 2. Guide bars 202 are provided on the inner wall of the drug housing 2. These guide bars 202 engage within the guide grooves 105 of the hidden needle shield 1, preventing the hidden needle shield 1 from rotating relative to the drug housing 2. Therefore, the hidden needle shield 1 can only move axially relative to the drug housing 2. Limiting ribs 207 are also provided on the inner wall of the drug housing 2 to limit the rotation of the drug bottle holder 4.

[0241] In addition, a buckle 206 is provided on the inner wall above the medicine bin housing 2 , and the buckle 206 buckles the upper edge of the medicine bin pressure cover 7 so that the medicine bin pressure cover 7 is tightly mounted on the medicine bin housing 2 .

[0242] like Figure 36 The figure shows the structure of the medicine bottle holder 4. The medicine bottle holder 4 includes an upper end plate 401 and a sleeve 402 connected to the end plate 401. The sleeve 402 is used to set the pre-filled medicine bottle 8; a spiral groove 407 is provided on the outside of the sleeve 402, and the thread 304 on the inner wall of the locking sleeve 3 is inserted into the spiral groove 407, so that the locking sleeve 3 can rotate while moving up and down.

[0243] A limiting groove 406 is provided on the outer edge of the end plate 401 of the medicine bottle holder 4, and the limiting rib 207 of the medicine chamber shell 2 is embedded in the limiting groove 406 on the outer edge of the end plate 401 to limit the rotation of the medicine bottle holder 4. In addition, a push rod oblique pin insertion hole 404 is also provided on the end plate 401. The push rod oblique pin insertion hole 404 corresponds to the position of the locking sleeve push rod 6 in the axial direction, specifically corresponds to the position of the top block 604 of the locking sleeve push rod 6. The main unit connected to the device of this embodiment has a push rod 9, and push rod oblique pins 10 are provided on both sides of the push rod 9. During injection, the push rod 9 is inserted into the through hole in the center of the medicine bottle holder 4 to push the liquid medicine in the pre-filled medicine bottle 8. The push rod oblique pin 10 is inserted into the push rod oblique pin insertion hole 404 to lock the locking sleeve 3.

[0244] A clearance hole is also provided on one side of the end plate 401 to allow the automatic injection ejector rod 103 of the hidden needle sleeve 1 to pass through. Two bumps are also provided on the upper surface of the end plate 401. A cover plate with flat sides is positioned above the prefilled medicine bottle 8. The cover plate is embedded between the two bumps to restrict the rotation of the prefilled medicine bottle 8. A medicine chamber pressure cap 7 is placed above the cover plate of the prefilled medicine bottle 8 to secure the prefilled medicine bottle 8.

[0245] like Figure 37 The figure shows the structure of the locking sleeve push rod 6 , which includes a connecting ring and two push blocks 604 . The two push blocks 604 are respectively arranged on both sides above the medicine bottle holder 4 .

[0246] A receiving groove 403 is provided on the upper side wall of the sleeve 402 of the medicine bottle holder 4, and the top block 604 is provided in the receiving groove 403; two snap grooves 408 spaced apart from each other are provided on each of the receiving grooves 403, and a limiting buckle 605 is provided on the inner side of the top block 604, and the limiting buckle 605 can be snapped into the snap groove 408.

[0247] A reset element is further sleeved on the outside of the locking sleeve 3. Under the action of the reset element, the locking sleeve 3 can move axially along with the axial movement of the hidden needle sleeve 1. The locking sleeve 3 also has rotational movement while moving axially.

[0248] The reset element is a spring 5. A spring retaining sleeve 11 is also provided on the exterior of the locking sleeve 3. The upper surface of the spring retaining sleeve 11 abuts the upper edge of the medicine bottle holder 4, while the lower surface of the spring retaining sleeve 11 abuts the upper portion of the spring 5. The lower portion of the spring 5 abuts the hidden needle sleeve 1. Furthermore, the lower surface of the spring retaining sleeve 11 abuts the upper surface of the guide bar 202 of the medicine chamber housing 2, thereby confining the spring retaining sleeve 11 between the guide bar 202 and the end plate 401 of the medicine bottle holder 4.

[0249] The medicine bin pressure cover 7 in this embodiment has the same structure as the medicine bin pressure cover 7 in the first embodiment, and the connection between the medicine bin pressure cover 7 and the medicine bin housing 2 is also the same.

[0250] like Figure 38 As shown, in the initial state, the top block 604 corresponds to the top surface 3512 of one of the spiral slopes 305; at this time, the limit buckle 605 of the top block 604 is locked into the upper buckle groove 408. That is, the position of the top block 604 at this time is called position 1. In addition, in the initial state, the hidden needle is hidden inside the hidden needle cover 1.

[0251] When the hidden needle sleeve 1 is pushed upward from the lower surface of the hidden needle sleeve 1, the hidden needle sleeve 1 moves axially under the limitation of the drug chamber shell 2, and the locking sleeve 3 makes a spiral movement due to the cooperation between the thread 304 and the spiral groove 407. Therefore, the device of this embodiment switches from the initial state to the Figure 39 In the second state shown, after the hidden needle cover 1 rises a certain distance, the hidden needle is exposed. At this time, the needle protection cover of the hidden needle can be removed.

[0252] When the hidden needle sleeve 1 is released, the spring 5 squeezes the locking sleeve 3 downward, the locking sleeve 3 spirals downward, the hidden needle sleeve 1 moves axially downward, and the locking sleeve 3 and the hidden needle sleeve 1 return to the original position. Figure 38 As shown in the state, in the non-injection state, the hidden needle sleeve 1 can move freely, including abnormal touches, etc., which will not cause the hidden needle sleeve 1 and the locking sleeve 3 to be locked.

[0253] When the device of this embodiment is connected to the host and injection is performed, the hidden needle sleeve 1 moves upward relative to the hidden needle under the obstruction of the skin. When the automatic injection push rod 103 triggers the automatic injection function of the host, the push rod 9 starts to move downward. The push rod oblique pins 10 on both sides of the push rod 9 pass through the push rod oblique pin insertion holes 704 of the medicine chamber pressure cover 7 and the push rod oblique pin insertion holes 404 of the medicine bottle holder 4 in sequence, and then contact the top block 604 of the locking sleeve push rod 6.

[0254] The push rod 9 continues to move downward, and the push rod oblique pin 10 pushes the top block 604, causing the locking sleeve push rod 6 to move downward. The limit buckle 605 of the top block 604 disengages from the upper buckle groove 408 and moves downward along the receiving groove 403 until the limit buckle 605 is snapped into the lower buckle groove 408. The position of the top block 604 at this time is called position 2, i.e. Figure 40 The third state is shown. Furthermore, the top block 604 is embedded between the two spiral inclined surfaces 305 and is arranged opposite to the bottom surface 3511. At this time, the injection is completed.

[0255] After the needle is removed, the locking sleeve 3 is reset by the spring 5, and the reset locking sleeve 3 rotates to Figure 41 In the state shown, at this time, the top surface 3512 of the spiral slope 305 is arranged opposite to the top block 604. If the hidden needle sleeve 1 is pushed upward, the hidden needle sleeve 1 and the locking sleeve 3 cannot move upward due to the obstruction of the top block 604, thereby achieving the locking of the locking sleeve 3 and the hidden needle sleeve 1, which can effectively protect the needle from puncture.

[0256] Example 3

[0257] This embodiment provides a pen-type injector control system for controlling the above-mentioned pen-type injector, including:

[0258] Automatic wake-up module, used to trigger the host to power on when the medicine chamber and the host are connected, so that the host enters the standby state;

[0259] The automatic injection module is used to trigger the automatic drive component to push the piston of the medicine bottle in the medicine chamber forward to complete the injection when the host enters the standby state and one end of the medicine chamber is pressed.

[0260] The injection status monitoring module is used to monitor the status of the injection trigger switch 14 and the current status of the automatic drive component. When the injection trigger switch 14 is in the released state or the current is abnormal, the injection status monitoring module sends a signal and controls the automatic drive component to stop injection.

[0261] Networking module, used for communication with external devices.

[0262] Wherein, the automatic wake-up module includes a wake-up circuit unit, such as Figure 43As shown, the wake-up circuit unit includes a wake-up trigger switch 20 (SW1), the second contact of the wake-up trigger switch 20 (SW1) is connected to the G pole of the first MOS tube and the G pole of the second MOS tube, the S pole of the second MOS tube is connected to the power supply 21 (J1), and the power supply 21 (J1) supplies power to the host; the high-voltage end of the power supply 21 (J1) is connected to the first contact of the wake-up trigger switch 20 (SW1).

[0263] When the wake-up trigger switch 20 (SW1) is pressed with force, the power supply 21 (J1) is turned on through the first MOS transistor and the second MOS transistor, so that the power supply 21 (J1) supplies power to the host.

[0264] The automatic injection module comprises:

[0265] A skin sensing unit provided on the medicine bin is configured to be triggered when the main unit enters a standby state and one end of the medicine bin is pressed;

[0266] The automatic driving unit installed on the main unit is used to complete the injection when the skin sensing unit is triggered and reset after the needle is removed;

[0267] The injection position unit provided on the host machine is used to monitor the starting position and end position of the automatic drive unit.

[0268] like Figure 44 As shown, the skin sensing unit includes a skin sensing circuit, which includes an injection trigger switch 14 (SW6). This injection trigger switch 14 (SW6) is connected to the MCU control unit. When the injection trigger switch 14 (SW6) is pressed, the MCU control unit receives the injection signal and activates the automatic drive unit.

[0269] like Figure 45 As shown, the automatic drive unit includes an automatic drive circuit, which includes a motor drive chip. The motor drive chip is connected to the MCU control unit via IO control signal connection lines (MOTOR_IN1 and MOTOR_IN2) and a current detection line (MOTOR_CURRENT_ADC). The motor drive chip is connected to the motor 17. In addition, the drive mode of the motor 17 can also be selected through the mode selection.

[0270] like Figure 46As shown, the injection position unit includes an injection position circuit, which includes a first position switch 15 (SW7) and a second position switch 16 (SW8). Both the first position switch 15 (SW7) and the second position switch 16 (SW8) are connected to the MCU control unit. When both the first position switch 15 (SW7) and the second position switch 16 (SW8) are triggered and pressed, the push rod 9 is at the starting position. When both the first position switch 15 (SW7) and the second position switch 16 (SW8) are released, the push rod 9 is at the end position.

[0271] like Figure 47 As shown, the networking module includes a networking module circuit, and the networking module circuit includes a Bluetooth chip. The Bluetooth chip is connected to the MCU control unit. The Bluetooth chip is also connected to the antenna A1, and can communicate with external devices through the antenna A1.

[0272] The control principle of the pen-type injector control system provided in this embodiment is:

[0273] First, the medicine bin is connected to the host. After the medicine bin and the host are connected and locked, the host switches from the sleep state to the wake-up standby state, and the MCU monitors the status of each unit.

[0274] Then, the needle cap is removed, and the pen-type syringe is held to complete the injection. During the injection process, after the patient completes the injection, the hidden needle cover 1 mounted on the drug reservoir moves axially toward the main unit, and the automatic injection ejector 103 triggers the injection trigger switch 14. Simultaneously, the MCU control unit determines whether to initiate the injection based on the SW_SKIN status (switch SW6, i.e., the injection trigger switch 14) and monitors the motor current in real time using the MOTOR_CURRENT_ADC.

[0275] When the needle is started, the hidden needle sleeve 1 is pressed, the switch SW6 is triggered, SW_SKIN changes from high level to low level, and the signal is transmitted to the MCU control unit. The MCU issues the start injection instruction to control the output level of MOTOR_IN1 and MOTOR_IN2.

[0276] Simultaneously, the main unit drives motor 17 to linearly move push rod 9 axially toward the medication chamber, pushing the piston of the prefilled vial to complete the injection. Motor 17 drives push rod 9 from its initial position (switch SW7 (first position switch 15), switch SW8 (second position switch 16), both switches SW7 and SW8 activated) to its final position (switches SW7 and SW8 released).

[0277] At the same time, the light strips on the main unit light up one by one to indicate the progress of the injection. When the injection is complete and the entire injection is complete, the light strips all light up. A buzzer on the main unit also sounds to indicate that the injection is complete. This serves as a double reminder to the user that the injection is complete and the needle can be removed.

[0278] The injection progress indicator light is controlled by calculating the motor's operating speed and time, combined with the two push rods' position detection information. During the injection process, the MCU monitors the motor current (MOTOR_CURRENT_ADC) in real time. If the current reaches the set threshold (Imax), the MCU stops the motor and issues an alarm through the indicator light and buzzer.

[0279] If the switch fails during the injection process, the motor will continue to move forward and the MCU controller will continue to monitor the motor current. When the current reaches the set threshold, the MCU controller will stop the motor and indicate the injection abnormality through the indicator light.

[0280] In addition, the mainboard is equipped with a Bluetooth module with Bluetooth transceiver function. It can be connected to a Bluetooth device and the injection speed can be set through the Bluetooth app. During the injection process, the MCU control unit will monitor the motor current MOTOR_CURRENT_ADC in real time. If any abnormality occurs, the MCU controller will stop the motor and indicate the injection abnormality through the indicator light.

[0281] When the device wakes up and turns on, it will automatically connect to the nearby bound mobile phone APP and synchronize the treatment information to the mobile phone. The mobile phone can also send parameters to the device. In addition, the mobile phone APP will synchronize with the web cloud in real time; in this way, the doctor can set up the treatment course online, and the doctor and other personnel can see the patient's treatment data through the mobile phone APP or cloud web page. If they forget, they can also set reminders.

[0282] The needle is then pulled out, and after the needle is pulled out, the motor 17 drives the lead screw to reverse, so that the push rod 9 returns to the starting position SW7.

[0283] Remove the medicine chamber and release the wake-up trigger switch 20, and the device will automatically power off.

[0284] Example 4

[0285] This embodiment provides a method for controlling automatic injection of a pen-type injector, which is used to control the above-mentioned pen-type injector or to be used in conjunction with the above-mentioned pen-type injector control system, including:

[0286] S1. The host receives a trigger from the wake-up structure of the medicine chamber and activates the wake-up trigger switch 20 of the host, so that the host enters the standby state;

[0287] S2, the injection trigger switch 14 receives the trigger signal from the hidden needle cover 1 in the medicine chamber, and then transmits the injection signal to the MCU control unit, so that the MCU control unit drives the automatic drive component to move from the starting position to the end position to complete the injection;

[0288] S3. Based on the detection of the starting position and the end position, the light strips are sequentially lit during the movement of the automatic drive component until a sound prompt is triggered when the end position is reached;

[0289] S4: After there is no trigger signal from the injection trigger switch, the automatic drive assembly moves in the reverse direction and returns to the starting position.

[0290] In addition, the MCU control unit drives the automatic drive component to move from the starting position to the end position, and the injection speed can be set through the Bluetooth APP; and during the injection process, the MCU control unit monitors the motor current in real time. If the motor current is abnormal, the MCU control unit controls the motor 17 to stop running and indicates the injection abnormality through the light strip.

[0291] The above specific embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the scope of the technical solutions of the present invention, and all of these should be included in the scope of the claims of the present invention.

Claims

1. A pen-type injector, comprising a drug chamber and a main unit, characterized in that: One end of the medicine bin is detachably connected to one end of the host; The medicine bin is provided with a wake-up structure, and the host has a wake-up trigger switch. The wake-up structure is configured such that when the medicine bin is connected to the host, the wake-up structure can trigger the wake-up trigger switch to put the host into a standby state; The medicine chamber is further provided with a hidden needle linkage mechanism, which includes a hidden needle sleeve; an injection trigger switch and an automatic drive component are provided in the host; the hidden needle linkage mechanism is configured so that when the host is in a standby state and one end of the hidden needle sleeve is subjected to force, the hidden needle linkage mechanism will move toward the host, triggering the injection trigger switch, causing the automatic drive component to move toward the medicine chamber, pushing the piston of the medicine bottle inside the medicine chamber forward to complete the injection of the liquid medicine; The medicine chamber further comprises a medicine chamber shell, an active sliding oblique pin is provided inside the medicine chamber shell, a sliding groove is provided on the side wall of the hidden needle sleeve, and the active sliding oblique pin can be embedded in the sliding groove; The medicine bin also includes a locking sleeve, a medicine bottle holder, and a locking sleeve ejector rod. The hidden needle sleeve is arranged inside the medicine chamber shell, and the bottom of the hidden needle sleeve extends out of the medicine chamber shell; the locking sleeve is arranged above the hidden needle sleeve, and the medicine bottle holder is arranged inside the locking sleeve, and the inside of the medicine bottle holder is used to place a pre-filled medicine bottle; the bottom of the locking sleeve and the top of the hidden needle sleeve are interlocked with each other, and the locking sleeve ejector rod is arranged above the medicine bottle holder; Furthermore, when no injection is being performed, the locking sleeve and the hidden needle sleeve can move freely, so that the hidden needle inside the pre-filled medicine bottle can be exposed or hidden; After the injection is completed, the locking sleeve ejector rod can lock the locking sleeve so that the hidden needle inside the pre-filled medicine bottle cannot be exposed.

2. The pen-type injector according to claim 1, characterized in that The hidden needle linkage mechanism is configured so that when the injection of the liquid medicine is completed and the needle is pulled out, the needle is hidden and confined inside the medicine chamber.

3. The pen-type injector according to claim 1 or 2, characterized in that The awakening structure is an awakening lever, which is arranged at one end where the medicine bin is connected to the host. When the medicine bin is installed on the host, the awakening lever can trigger the awakening trigger switch.

4. The pen-type injector according to claim 2, characterized in that An automatic injection ejector rod is provided on one side of the hidden needle sleeve. When the main unit is in a ready-to-work state and one end of the hidden needle sleeve is subjected to force, the hidden needle linkage mechanism will move toward the main unit; the automatic injection ejector rod triggers the injection trigger switch, causing the automatic drive component to move toward the medicine chamber, pushing the piston of the medicine bottle inside the medicine chamber forward to complete the injection of the medicine solution.

5. The pen-type injector according to claim 1, characterized in that The lower surface of the locking sleeve is provided with circumferentially evenly distributed oblique teeth, and the upper surface of the hidden needle sleeve is provided with a sliding limit surface that cooperates with the oblique teeth, the sliding limit surface having a high point and a low point, and the connecting surface between the high point and the low point is an oblique surface; a spring is further sleeved on the outside of the locking sleeve, and under the action of the spring, the oblique teeth can rotate along with the axial movement of the hidden needle sleeve, and the tooth tip position of the oblique teeth switches between the high point and the low point; The locking sleeve is provided with a plurality of locking strips. In the initial state, one of the locking strips corresponds to the top rod of the locking sleeve above and below. The width of the top rod of the locking sleeve is smaller than the spacing between adjacent locking strips. After the injection is completed, the distance between the lower surface of the locking sleeve push rod and the upper surface of one of the locking strips is set to The distance between the hidden needle inside the prefilled medicine bottle and the lower surface of the hidden needle cover is , the tooth tip height of the helical teeth is ,but < , < ; The number of the locking sleeve push rods is 2, and the two locking sleeve push rods are respectively arranged on both sides above the medicine bottle holder; An accommodating groove is provided on the upper side wall of the medicine bottle holder, and the locking sleeve ejector rod is provided in the accommodating groove; A push rod oblique pin insertion hole is provided above the medicine bottle holder, and the push rod oblique pin insertion hole corresponds to the position of the locking sleeve push rod in the axial direction; A downward groove is provided on the upper surface of the locking sleeve push rod, and the inner wall outside the groove is an inclined surface. The automatic drive component has a push rod inclined pin, and the push rod inclined pin is inserted into the groove after passing through the push rod inclined pin insertion hole.

6. The pen-type injector according to claim 1, characterized in that An annular groove is provided on the lower outer wall of the locking sleeve, a buckle is provided on the upper part of the hidden needle sleeve, and the buckle is snapped into the annular groove; a spiral groove is provided on the outer wall of the medicine bottle holder, and a thread is provided on the inner wall of the locking sleeve, and the thread is snapped into the spiral groove; A spring is also sleeved on the outside of the locking sleeve. Under the action of the spring, the locking sleeve can move axially along with the axial movement of the hidden needle sleeve. The locking sleeve also has rotational movement while moving axially. A spring limiting sleeve is further provided on the outside of the locking sleeve, wherein the upper surface of the spring limiting sleeve abuts against the upper edge of the medicine bottle holder, the lower surface of the spring limiting sleeve abuts against the upper side of the spring, and the lower side of the spring abuts against the hidden needle sleeve; The locking sleeve ejector rod comprises a connecting ring and two ejector blocks, and the two ejector blocks are respectively arranged on both sides above the medicine bottle holder; A receiving groove is provided on the upper side wall of the medicine bottle holder, and the top block is provided in the receiving groove; two buckle grooves spaced apart from each other are provided on each receiving groove, and a limiting buckle is provided on the inner side of the top block, and the limiting buckle can be snapped into the buckle groove.

7. The pen-type injector according to claim 1, characterized in that The automatic drive assembly includes a motor and a push rod, the output shaft of the motor is a lead screw, a through hole is provided in the center of the push rod, a thread is provided on the inner wall of the through hole, the lead screw is threadedly connected to the push rod; push rod oblique pins are provided on both sides of the push rod.

8. The pen-type injector according to claim 7, characterized in that A main board is provided on one side of the motor, a first position switch and a second position switch are provided on the main board, a trigger step is provided on the side of the push rod, and when the push rod moves along the axis, the trigger step can trigger the first position switch and the second position switch.

9. The pen-type injector according to claim 8, characterized in that A row of equally spaced light strips is provided on the main board, and the light strips are configured to light up in sequence when the trigger step moves from the first position switch to the second position switch.

10. A pen-type injector control system for controlling the pen-type injector according to any one of claims 1 to 9, characterized in that: include: Automatic wake-up module, used to trigger the host to power on when the medicine chamber and the host are connected, so that the host enters the standby state; The automatic injection module is used to trigger the automatic drive component to push the piston of the medicine bottle in the medicine chamber forward to complete the injection when the host enters the standby state and when one end of the medicine chamber is pressed.

11. The pen-type injector control system according to claim 10, characterized in that: Also includes: The injection status monitoring module is used to monitor the status of the injection trigger switch and the current status of the automatic drive component. When the injection trigger switch is in the released state or the current is abnormal, the injection status monitoring module sends a signal and controls the automatic drive component to stop injection.

12. The pen-type injector control system according to claim 10, characterized in that: Also includes: Networking module, used for communication with external devices.

13. The pen-type injector control system according to claim 10, characterized in that: The automatic wake-up module includes a wake-up circuit unit, which includes a wake-up trigger switch. The second contact of the wake-up trigger switch is connected to the G pole of the first MOS tube and the G pole of the second MOS tube, and the S pole of the second MOS tube is connected to the power supply, which supplies power to the host; the high-voltage end of the power supply is connected to the first contact of the wake-up trigger switch.

14. The pen-type injector control system according to claim 10, wherein: The automatic injection module comprises: A skin sensing unit is provided on the main unit, and is used to be triggered when the main unit enters the standby state and when one end of the medicine chamber is pressed; The automatic driving unit installed on the main unit is used to complete the injection when the skin sensing unit is triggered and reset after the needle is removed; The injection position unit provided on the host machine is used to monitor the starting position and end position of the automatic drive unit.

15. The pen-type injector control system according to claim 14, characterized in that: The skin sensing unit includes a skin sensing circuit, and the skin sensing circuit includes an injection trigger switch, and the injection trigger switch is connected to the MCU control unit provided in the host.

16. The pen-type injector control system according to claim 14, characterized in that: The automatic driving unit includes an automatic driving circuit, which includes a motor driving chip. The motor driving chip is connected to the MCU control unit set in the host through an IO control signal connection line and a current detection line; the motor driving chip is connected to the motor.

17. The pen-type injector control system according to claim 14, wherein: The injection position unit includes an injection position circuit, and the injection position circuit includes a first position switch and a second position switch. The first position switch and the second position switch are both connected to the MCU control unit provided in the host.

18. The pen-type injector control system according to claim 12, wherein: The networking module includes a networking module circuit, and the networking module circuit includes a Bluetooth chip. The Bluetooth chip is connected to the MCU control unit set in the host. The Bluetooth chip is also connected to an antenna, and can communicate with external devices through the antenna.

19. A method for controlling automatic injection of a pen-type injector, wherein the pen-type injector is the pen-type injector according to any one of claims 1 to 9, characterized in that: include: S1. The host receives a trigger from the wake-up structure of the medicine chamber, activates the wake-up trigger switch of the host, and puts the host into a standby state; S2: The injection trigger switch receives a trigger signal from the hidden needle sleeve in the medicine chamber, and then transmits the injection signal to the MCU control unit set in the host, so that the MCU control unit drives the automatic drive component to move from the starting position to the end position to complete the injection; S3. Based on the detection of the starting position and the end position, the light strip is sequentially illuminated during the movement of the automatic drive component until a sound prompt is triggered when the end position is reached; wherein the light strip is provided on the host; S4: After there is no trigger signal from the injection trigger switch, the automatic drive assembly moves in the reverse direction and returns to the starting position.

20. The automatic injection control method according to claim 19, characterized in that: The MCU control unit drives the automatic drive component to move from the starting position to the end position, and the injection speed can be set through the Bluetooth APP; and during the injection process, the MCU control unit monitors the motor current in real time. If the motor current is abnormal, the MCU control unit controls the motor to stop running and indicates the injection abnormality through the light strip.

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