CN118873796A - Automatic drug delivery device - Google Patents

Abstract

The present invention provides an automatic drug delivery device comprising: the medicine storage device comprises a medicine storage cavity and a piston assembly arranged in the medicine storage cavity; the injection piece is communicated with the medicine storage cavity; the automatic injection device comprises an injection elastic pushing assembly and an injection stay wire, wherein the injection elastic pushing assembly is used for fixing the injection elastic pushing assembly to enable the injection elastic pushing assembly to be in an energy storage state; the control device comprises a controller, an injection heating device and a power supply device, wherein the injection heating device and the power supply device are connected with the controller, and the injection heating device and the injection stay wire are oppositely arranged; the control device controls the injection heating device to be connected with the power supply device according to preset injection time, the injection heating device is heated and fused after being electrified to form an injection stay wire, and the injection elastic pushing component releases elasticity to push the injection piston component to move after the injection stay wire is fused, so that medicine in the medicine storage cavity is pushed into the injection needle to realize medicine delivery.

Description

Automatic drug delivery device

This application is a divisional application of a patent application with an application date of 2020-12-10, application number 202011462102.7, and name being an automatic drug delivery device.

Technical Field

The present invention relates to the technical field of medical device design, and in particular to an automatic drug delivery device.

Background Art

In the field of medical drug delivery, there are many drug delivery drive methods on the market, such as motor drive, memory alloy drive, pressure ceramic drive, and mechanical spring drive. Motor drive means: the battery drives the motor to rotate, and pushes the syringe piston through mechanical transmission and screw mechanism to deliver the drug. Memory alloy drive means: the shape memory alloy changes its shape when it is applied with electrical energy, but returns to its natural state after the electrical energy is removed, and drives the syringe piston through mechanical transmission to deliver the drug. Pressure ceramic drive means: piezoelectric ceramics produce telescopic deformation under external driving voltage, and drive the syringe piston through mechanical transmission to deliver the drug. Mechanical spring drive means: the compression spring is manually released, and the compression spring drives the syringe piston to deliver the drug.

In the field of medical drug delivery, the existing drug delivery drive methods currently on the market have different technical shortcomings; the motor drive solution has a complex structure, high power supply requirements, and high cost; the shape memory alloy and pressure ceramic drive solutions have high production process requirements and low stability; the mechanical spring drive cannot automatically time the drug delivery.

Summary of the invention

In view of the problems in the background technology, the present invention provides an automatic drug delivery device, comprising:

A medicine storage device, comprising a medicine storage cavity and a piston assembly disposed in the medicine storage cavity;

an injection needle, connected to the drug storage cavity;

The automatic injection device comprises an injection elastic push component and an injection pull line for fixing the injection elastic push component to be in an energy storage state;

The control device includes a controller, an injection heating device and a power supply device connected to the controller, and the injection heating device is arranged opposite to the injection pull line; the control device controls the injection heating device to be connected to the power supply device according to a preset injection time, and the injection heating device heats and fuses the injection pull line after being energized, and after the injection pull line is fused, the injection elastic pushing component releases its elasticity to push the injection piston component to move, so as to push the medicine in the medicine storage cavity into the injection needle to achieve drug administration.

In some embodiments, the injection elastic pushing assembly includes an injection support, an injection push rod and an injection elastic member; the injection push rod is axially movably installed in the injection support, the injection elastic member is arranged between the injection push rod and the injection support, the injection pull wire connects the injection push rod and the injection support, and makes the injection elastic member in an energy storage state; after the injection pull wire is melted, the injection elastic member releases its elasticity, pushing the injection push rod to move toward one side of the medicine storage chamber, and the injection push rod pushes the injection piston assembly to move.

In some embodiments, the injection elastic member is an injection spring sleeved on the injection push rod, and two ends of the injection spring are respectively connected to the injection push rod and the injection bracket.

In some embodiments, the injection push rod extends out of the injection support toward one end of the drug storage cavity and extends into the drug storage cavity, and a push rod sealing ring is sleeved on the end of the injection push rod for sealing with the inner wall of the drug storage cavity.

In some embodiments, the injection elastic pushing assembly also includes a push rod identification assembly for identifying the position of the injection push rod; the push rod identification assembly includes a sensor and an identification piece arranged on the injection push rod, and the sensor is connected to the controller; the sensor identifies the identification piece to identify the moving position of the injection push rod and feeds back to the controller.

In some embodiments, there is also a prompter connected to the controller, the prompter includes a light signal prompt and/or a sound signal prompt, when the sensor detects that the injection push rod pushes the injection piston to move to the position after the complete drug output in the drug storage chamber, the controller controls the light signal prompt to generate a light signal and/or controls the sound signal prompt to generate a sound signal.

In some embodiments, the reminder uses an alarm light and a buzzer.

In some embodiments, an automatic needle insertion device is also included; the automatic needle insertion device includes:

A needle insertion elastic pushing component for pushing the injection needle into the injection site;

A needle insertion pull wire used to fix the needle insertion elastic pushing assembly and keep it in an energy storage state;

A needle insertion heating device is arranged opposite to the needle insertion pull wire, and the needle insertion heating device is connected to the controller; before the automatic injection device administers the drug, the controller controls the needle insertion heating device to be connected to the power supply device according to the preset needle insertion time, and the needle insertion heating device heats and fuses the needle insertion pull wire after being energized. After the needle insertion pull wire fuses, the needle insertion elastic pushing component releases its elasticity to push the injection needle to move and pierce the injection site.

In some embodiments, an automatic needle withdrawal device is also included, and the automatic needle withdrawal device includes:

A needle-retracting elastic pushing component for pushing the injection needle out of the injection site;

A needle withdrawal pull line used to fix the needle withdrawal elastic pushing assembly and put it in an energy storage state;

A needle withdrawal heating device is arranged opposite to the needle withdrawal pull wire, and the needle withdrawal heating device is connected to the controller; after the automatic injection device administers the drug, the controller controls the needle withdrawal heating device to be connected to the power supply device according to the preset needle withdrawal time, and the needle withdrawal heating device is electrically heated to fuse the needle withdrawal pull wire. After the needle withdrawal pull wire is fused, the needle withdrawal elastic pushing component releases its elasticity to push the injection needle to withdraw from the injection site.

In some embodiments, the needle insertion elastic pushing assembly includes a needle insertion and withdrawal bracket, a first guide member, a needle insertion push block, and a needle insertion elastic member. The first guide member is installed on the needle insertion and withdrawal bracket, the needle insertion push block is movably installed on the first guide member, the needle insertion elastic member is arranged between the needle insertion push block and the needle insertion and withdrawal bracket, the needle insertion pull wire connects the needle insertion push block and the needle insertion and withdrawal bracket, and makes the needle insertion elastic member in an energy storage state;

The injection needle is connected to the needle insertion push block. After the needle insertion pull wire is melted, the needle insertion elastic member releases its elasticity to push the needle insertion push block to move along the first guide member and drive the injection needle to penetrate into the injection site.

In some embodiments, the first guide member is a first guide rod, the needle insertion elastic member is a needle insertion spring sleeved on the first guide rod, and the two ends of the needle insertion spring are respectively connected to the needle insertion push block and the needle insertion and retraction bracket.

In some embodiments, the needle withdrawal elastic pushing assembly includes a second guide member, a needle withdrawal push block, a needle withdrawal elastic member and a connecting member; the second guide member is installed on the needle advance and retreat bracket, the needle withdrawal push block and the connecting member are movably installed on the second guide member, and the connecting member is fixedly connected to the needle advance push block; the needle withdrawal elastic member is arranged between the connecting member and the needle withdrawal push block, the needle withdrawal pull line connects the needle withdrawal push block and the connecting member, and makes the needle withdrawal elastic member in an energy storage state;

The injection needle is also connected to the needle withdrawal push block. After the needle withdrawal pull wire is melted, the needle withdrawal elastic member releases its elasticity to push the needle withdrawal push block to move along the second guide member. The movement of the needle withdrawal push block drives the injection needle to withdraw from the injection site.

In some embodiments, the second guide member is a second guide rod, the needle withdrawal elastic member is a needle withdrawal spring sleeved on the second guide rod, and the two ends of the needle withdrawal spring are respectively connected to the needle withdrawal push block and the connecting member.

In some embodiments, the drug storage cavity has a drug outlet and a first drug inlet, the drug outlet is connected to the injection needle, and the first drug inlet is provided with a drug inlet seal; the drug is injected into the drug storage cavity through the injection needle through the drug inlet seal and the first drug inlet.

In some embodiments, a drug injection needle guide cone is provided in the first drug inlet, and the diameter of the drug injection needle guide cone close to the drug storage cavity is smaller than the diameter of the end away from the drug storage cavity. The drug injection needle passes through the drug inlet seal and then passes through the drug injection needle guide cone.

In some embodiments, a drug outlet seal is provided at the connection between the injection needle and the drug outlet.

In some embodiments, a housing is further included, and the drug storage device, injection needle, automatic injection device, automatic needle insertion device, automatic needle withdrawal device, and control device are installed in the housing.

In some embodiments, an injection needle guide block is provided in the shell, and a guide hole is provided on the injection needle guide block. The guide hole has openings at both ends for the insertion of the injection needle. One end of the guide hole is connected to the inside of the shell, and the other end is connected to the outside of the shell. The injection needle is inserted into the guide hole, moves along the guide hole, extends out of the shell and the guide hole, and penetrates into the injection site for injection, or moves along the guide hole and retracts into the guide hole after the injection is completed.

In some embodiments, a first sealing structure is disposed on an opening at one end of the guide hole communicating with the interior of the shell.

In some embodiments, the bottom of the housing is provided with an adhesive layer for connecting the automatic drug delivery device to the injection site.

In some embodiments, a bottom shell bracket is provided at the bottom of the shell, and the bottom shell bracket is detachably installed at the bottom of the shell. A second sealing structure for sealing the opening is provided on the bottom frame at a position corresponding to the opening at one end of the guide hole facing the outside of the shell; the first sealing structure, the second sealing structure and the guide hole constitute a sealing area for sealing the needle tip of the injection needle.

In some embodiments, a second drug inlet that is in communication with the first drug inlet is disposed on the bottom shell support at a position corresponding to the first drug inlet, and a drug injection needle guide sleeve is disposed in the second drug inlet.

In some embodiments, the controller includes a circuit board, and the controller, injection heating device, needle insertion heating device, needle withdrawal heating device and power supply device are arranged on the circuit board; the circuit board is also provided with a switch for controlling the start and stop of the device.

Due to the adoption of the above technical solution, the present invention has the following advantages and positive effects compared with the prior art:

The automatic drug delivery device provided by the present invention uses an injection heating device to fuse the injection pull wire. After the injection elastic pushing component loses the restriction of the injection pull wire, the injection elastic pushing component uses its own stored elastic potential energy to realize automatic drug delivery. This solution uses a low-capacity power supply device to allow the injection heating device to generate heat to fuse the injection pull wire. It has low power supply requirements and mainly uses the stored elastic force. In addition, the elastic structure and the pull wire structure are simple and low-cost, and the processing technology is mature and simple. In addition, the present invention also uses a controller to time the fusing of the injection pull wire, thereby realizing the process of automatic timed drug delivery.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other features and advantages of the present invention will be more clearly understood through the following detailed description in conjunction with the accompanying drawings, in which:

FIG1 is a schematic diagram of the disassembly of the automatic drug delivery device provided by the present invention;

FIG2 is a schematic diagram of opening the automatic drug delivery device provided by the present invention;

FIG3 is a schematic diagram of the disassembly of the bottom shell of the present invention;

FIG4 is a schematic diagram of the structure of a circuit board in the present invention;

FIG5 is a schematic diagram of the disassembly of the medicine storage device of the present invention;

FIG6 is a schematic diagram of the disassembly of the automatic injection device of the present invention;

FIG7 is a schematic diagram of the interior of the automatic needle insertion device and the automatic needle withdrawal device of the present invention;

FIG. 8 is a schematic diagram of the structure of the automatic needle insertion device and the automatic needle withdrawal device in the present invention

FIG9 is a front view of the upper cover of the present invention;

FIG10 is a schematic diagram of the back side of the upper cover of the present invention;

FIG11 is a cross-sectional view of the present invention before drug injection into the drug storage cavity;

FIG12 is a cross-sectional view of the present invention after the drug storage cavity is injected with drugs;

FIG13 is a cross-sectional view of the present invention after the injection needle has penetrated into the injection site;

FIG14 is a cross-sectional view of the present invention after the drug is injected through the injection needle;

FIG. 15 is a cross-sectional view of the present invention after the injection needle is withdrawn.

DETAILED DESCRIPTION

The present invention will be described in more detail below with reference to the accompanying drawings showing embodiments of the present invention. However, the present invention may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are set forth in order to achieve a full and complete disclosure and to enable those skilled in the art to fully understand the scope of the present invention. In these drawings, the sizes and relative sizes of layers and regions may be exaggerated for clarity.

It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

1-15, the present invention provides an automatic drug delivery device, comprising a drug storage device 5, an injection needle, an automatic injection device 6 and a control device 3; the drug storage device 5 comprises a drug storage chamber 51 and a piston assembly arranged in the drug storage chamber 51; the injection needle is connected to the drug storage chamber 51; the automatic injection device 6 comprises an injection elastic push assembly and an injection pull wire 64 for fixing the injection elastic push assembly to put it in an energy storage state; the control device 3 comprises a controller 34, an injection heating device 32-3 connected to the controller 34 and a power supply device 1, and the injection heating device 32-3 is arranged opposite to the injection pull wire 64; the control device 3 controls the injection heating device 32-3 to be connected to the power supply device 1 according to a preset injection time, and the injection heating device 32-3 heats and fuses the injection pull wire 64 after being energized, and after the injection pull wire 64 is fused, the injection elastic push assembly releases its elasticity to push the piston assembly to move, and pushes the medicine in the drug storage chamber 51 into the injection needle to achieve drug delivery.

The automatic drug delivery device provided by the present invention uses the injection heating device 32-3 to fuse the injection pull wire 64. After the injection elastic pushing component loses the restriction of the injection pull wire 64, the injection elastic pushing component uses its own stored elastic potential energy to realize the automatic pushing of the drug. This solution uses a low-capacity power supply device to allow the injection heating device 32-3 to generate heat to fuse the injection pull wire 64. It has low power supply requirements and mainly uses the stored elastic force. In addition, the elastic structure and the pull wire structure are simple and low-cost, and the processing technology is mature and simple. In addition, the present invention also uses the controller to time the fusing of the injection pull wire 64, thereby realizing the process of automatic timed drug delivery.

In this embodiment, as shown in FIG. 5 , the medicine storage chamber 51 is a cylindrical structure with an opening at one end, and the piston assembly is installed in the medicine storage chamber 51 through the opening.

Among them, the drug storage cavity 51 is provided with a first drug inlet. Before the automatic drug delivery device is used, the drug to be injected is first injected into the drug storage cavity 51 through the injection needle through the first drug inlet for storage, so as to facilitate the subsequent automatic timed injection of the drug. Furthermore, a drug inlet seal 56 is provided in the first drug inlet to achieve sealing. The drug inlet seal 56 can be implemented by a rubber sealing pad or other structure, which is not limited here and can be selected according to specific circumstances; when injecting the prepared drug, the injection needle passes through the drug inlet seal 56 and is inserted into the first drug inlet. After the injection is completed, the injection needle is directly pulled out, and the drug inlet seal 56 still has a sealing effect on the first drug inlet. Furthermore, a drug injection needle guide cone 55 is also provided in the first drug inlet, and the diameter of the drug injection needle guide cone 55 at one end close to the drug storage chamber 51 is smaller than the diameter at the end away from the drug storage chamber 51; the drug injection needle guide cone 55 is first installed in the first drug inlet, and then the drug inlet seal 56 is installed on the first drug inlet; the drug injection needle passes through the drug inlet seal 56 and is then guided by the drug injection needle guide cone 55, so that the injection needle can be stably inserted into the first drug inlet; at the same time, the conical drug injection needle guide cone 55 can further prevent the drug in the drug storage chamber 51 from slanting out from the first drug inlet.

Among them, a drug outlet is provided on the drug storage chamber 51, and the drug outlet is used to communicate with the injection needle. Specifically, the connection can be achieved through a delivery tube or the like. Under the action of the piston assembly, the drug in the drug storage chamber 51 is delivered from the drug outlet to the injection needle for drug administration; further, a drug outlet seal 52 is provided at the connection between the injection needle and the drug outlet to prevent leakage of the drug at the connection. The specific drug outlet seal 52 can be a sealing ball or the like, and there is no limitation here, as long as the sealing effect is guaranteed.

The piston assembly includes an injection piston 54 and a connecting rod 57 coaxially connected to the injection piston 54; the injection piston 54 is axially movably installed in the medicine storage chamber 51. Further, a sealing ring 53 is provided between the injection piston 54 and the inner wall of the medicine storage chamber 51 to achieve sealing to prevent leakage; specifically, a mounting groove is provided on the outer ring of the injection piston 54, and the sealing ring 53 is placed in the mounting groove for installation, and the outer ring of the sealing ring 53 is against the inner wall surface of the medicine storage chamber 51 to achieve the sealing function; the sealing ring 53 can be implemented by an O-ring or other structure, which is not limited here.

In this embodiment, in combination with FIGS. 1 , 2 , and 6 , the injection elastic pushing assembly includes an injection bracket 61 , an injection push rod 68 , and an injection elastic member 65 .

Specifically, the injection bracket 61 is coaxially arranged at the rear of the medicine storage chamber 51; the injection bracket 61 has a space for installing the injection push rod 68, one end of the injection push rod 68 is axially movably installed in the injection bracket 61, and the other end extends out of the injection bracket 61 to push the piston assembly to move; the injection elastic member 65 is arranged between the injection push rod 68 and the injection bracket 61, and the injection pull wire 64 connects the injection push rod 68 and the injection bracket 61. The injection pull wire 64 pulls the injection push rod 68 and the injection bracket 61 so that the injection elastic member 65 is compressed or stretched, so that the injection elastic member 65 stores energy; when the injection pull wire 64 is melted, the tension between the injection push rod 68 and the injection bracket 61 disappears, and the force applied to the injection elastic member 65 also disappears accordingly, the injection elastic member releases the elastic force, pushes the injection push rod 68 to move to the side of the medicine storage chamber 51, and the injection push rod 68 pushes the piston assembly to move.

Furthermore, the injection elastic member 65 is an injection spring sleeved on the injection push rod 68, and the two ends of the injection spring are respectively connected to the injection push rod 68 and the injection bracket 61, and the injection pull wire 64 pulls the injection push rod 68 and the injection bracket 61 towards each other, so that the injection spring is compressed between the two; the injection elastic pushing component of this structure is simple and compact in construction and easy to assemble; of course, in other embodiments, the injection elastic member 65 can also be in a stretched state to store energy, and the injection elastic member 65 can also use other elastic structures such as spring sheets to store energy, which is not limited here and can be adjusted according to specific circumstances, and is not limited here.

Furthermore, one end of the injection pull wire 64 extends into the injection push rod 68 and is fixedly connected through a fixed block 64-1, and the other end passes around the fixed column 62 of the injection bracket 61 and is then fixedly connected to the fixed block 64-1, as shown in Figure 11; of course, in other embodiments, the connection method between the injection pull wire 64 and the injection push rod 68 and the injection bracket 61 is not limited to the above. The above connection method is for the convenience of equipment assembly and can be adjusted according to specific circumstances, and is not limited here.

Furthermore, the other end of the injection push rod 68 extends into the medicine storage chamber 51 to push the piston assembly, and a push rod sealing ring 66 is sleeved on the end of the injection push rod 68 for sealing with the inner wall of the medicine storage chamber 51, thereby further preventing the medicine in the medicine storage chamber 51 from leaking out; specifically, a mounting groove 68-2 is provided on a circle on the end of the injection push rod 68, and the push rod sealing ring 66 is installed in the mounting groove 68-2 for fixation.

Furthermore, a socket for inserting the connecting rod 57 of the injection piston 54 is provided on the end of the injection push rod 68 facing the drug storage chamber 51, so as to realize the positioning between the injection push rod 68 and the injection piston 54 and the guiding function of axial movement. As shown in FIG11, before the device is injected with the drug to be injected, the injection piston 54 is located at the left end of the drug storage chamber 51; as shown in FIG11, after the drug is injected into the drug storage chamber 51 through the injection needle, the drug pushes the injection piston 54 to move toward the injection push rod 68 until the injection piston 54 hits the end face of the injection push rod 68. During this process, the connecting rod 57 moves along the socket to play a guiding role; as shown in FIG12, after a certain period of time, when the injection pull wire 64 is melted, the injection push rod 68 pushes the injection piston 54 to move to the left, pressing the drug into the injection needle.

Of course, in other embodiments, the arrangement of the jack and the connecting rod 57 may be omitted, and the end surface of the injection push rod 68 directly contacts the injection piston to realize the pushing function. This is not limited here and can be adjusted according to specific circumstances.

Further, as shown in Fig. 6, a one-way valve 67 is also provided at the end of the injection push rod 68 facing the injection piston 54. The injection push rod 68, the push rod sealing ring 66, the one-way valve 67 and the medicine storage chamber 51 form a one-way seal on the right side, and the injection piston 54, the sealing ring 53 and the medicine storage chamber 51 form a one-way complete seal on the left side; during the injection process, the air can be exhausted from the one-way valve 67, and the one-way valve 67 remains closed at other times, and the external air cannot enter the medicine storage chamber 51, thereby preventing the external air from affecting the cleanliness of the medicine storage chamber 51, so as to ensure the clean space of the medicine storage chamber 51.

In this embodiment, referring to FIG. 6 again, the injection elastic push assembly also includes a push rod identification assembly for identifying the position of the injection push rod 68, and is used to determine whether the medicine in the medicine storage cavity 51 has been completely pushed out. Specifically, the push rod identification assembly includes a sensor and an identification piece 68-1 arranged on the injection push rod, and the sensor is connected to the controller 34; the sensor identifies the push position of the injection push rod 68 by identifying the identification piece 68-1, and feeds back to the controller 34. Among them, the sensor can specifically be a light sensor, and the identification piece can specifically be a light emitter, which is not limited here and can be selected according to specific circumstances.

Furthermore, a reminder connected to the controller 34 is also included, and the reminder includes a light signal reminder and/or an acoustic signal reminder. When the sensor detects that the injection push rod pushes the injection piston 54 to move to the position after the complete drug output in the drug storage chamber 51, the controller 34 controls the light signal reminder to generate a light signal and/or controls the acoustic signal reminder to generate an acoustic signal to notify that the injection is completed. In this embodiment, preferably, the reminder includes both a light signal reminder and an acoustic signal reminder, and specifically, an alarm light 36 and a buzzer 42 can be used.

Of course, in other embodiments, the prompter may only include a light signal prompter, or may only include a sound signal prompter. The specific structures of the light signal prompter and the sound signal prompter are not limited to the above structures, and can be selected according to the specific situation. There is no limitation here. In addition, the implementation method of the prompter is not limited to the light signal prompter and the sound signal prompter, and it can also be a tactile prompter such as a vibrator, which is not limited here.

In this embodiment, the automatic drug delivery device also includes a needle insertion and withdrawal assembly 2, including a needle insertion and withdrawal bracket 21, an automatic needle insertion device and an automatic needle withdrawal device arranged on the needle insertion and withdrawal bracket 21; the needle insertion and withdrawal assembly 2 is used to realize the automatic extension of the injection needle into the injection site, and the automatic withdrawal of the injection site, and further realizes the functions of automatic timed needle insertion and automatic timed needle withdrawal on the basis of automatic drug delivery, thereby realizing the full automatic function of the entire device.

Specifically, referring to Figures 7 and 8, the automatic needle insertion device includes a needle insertion elastic pushing component, a needle insertion pull wire 26-2, and a needle insertion heating device 32-2; the needle insertion elastic pushing component is used to push the injection needle into the injection site, and the needle insertion pull wire is used to fix the needle insertion elastic pushing component and put it in an energy storage state; the needle insertion pull wire 26-2 is arranged opposite to the needle insertion heating device 32-2, and the needle insertion heating device 32-2 is connected to the controller 34; before the automatic injection device administers the drug, the controller 34 controls the needle insertion heating device 32-2 to be connected to the power supply device 1 according to the preset needle insertion time, and the needle insertion heating device 32-2 is heated and melted after being energized. After the needle insertion pull wire 26-2 is melted, the needle insertion elastic pushing component releases its elasticity to push the injection needle to move and penetrate into the injection site.

The automatic needle withdrawal device includes a needle withdrawal elastic pushing component, a needle withdrawal pull line 23, and a needle withdrawal heating device 32-1. The needle withdrawal elastic pushing component is used to push the injection needle out of the injection site. The needle withdrawal pull line 23 is used to fix the needle withdrawal elastic pushing component and put it in an energy storage state. The needle withdrawal heating device 32-1 is arranged opposite to the needle withdrawal pull line 23, and the needle withdrawal heating device 32-1 is connected to the controller 34; after the automatic injection device administers the drug, the controller 34 controls the needle withdrawal heating device 32-1 to be connected to the power supply device 1 according to the preset needle withdrawal time, and the needle withdrawal heating device 32-1 is electrically heated to melt the needle withdrawal pull line 23. After the needle withdrawal pull line 23 is melted, the needle withdrawal elastic pushing component releases elastic force to push the injection needle out of the injection site.

The automatic needle insertion device and the automatic needle withdrawal device provided by the present invention also use their own stored elastic potential energy to implement the operations of needle insertion and needle withdrawal. This solution uses a low-capacity power supply device to allow the needle insertion heating device 32-2 and the needle withdrawal heating device 32-1 to generate heat to fuse the corresponding pull wires. It has low power supply requirements and mainly uses the stored elastic force. In addition, the elastic structure and the pull wire structure are simple and low-cost, and the processing technology is mature and simple. In addition, the present invention also uses a controller to time the fusing of the needle insertion pull wire 26-2 and the needle withdrawal pull wire 23, thereby realizing the process of automatic timed needle insertion and automatic timed needle withdrawal.

In this embodiment, referring to Figures 7 and 8, the needle insertion elastic pushing assembly includes a first guide member 25, a needle insertion push block 26-3, and a needle insertion elastic member 27. The first guide member 25 is installed on the needle insertion and withdrawal bracket 21, and the needle insertion push block 26-3 is movably installed on the first guide member 25. The needle insertion elastic member 27 is arranged between the needle insertion push block 26-3 and the needle insertion and withdrawal bracket 21. The needle insertion pull wire 26-2 connects the needle insertion push block 26-3 and the needle insertion and withdrawal bracket 21, and makes the needle insertion elastic member 27 in an energy storage state; the injection needle 8 is connected to the needle insertion push block 26-3. After the needle insertion pull wire 26-2 is melted, the needle insertion elastic member 27 releases its elasticity to push the needle insertion push block 26-3 to move along the first guide member 25, and drives the injection needle 8 to move so that its needle tip penetrates into the injection site.

Among them, the first guide member 25 adopts a first guide rod, and the needle insertion push block 26-3 adopts a needle insertion slider mounted on the first guide rod, so that the needle insertion push block 26-3 can move along the first guide rod; of course, in other embodiments, the first guide member can also be a slide rail structure, and the needle insertion push block can also be a slider structure installed on the slide rail. There is no limitation here and it can be adjusted according to specific circumstances.

The needle insertion elastic member 27 is a needle insertion spring sleeved on the first guide rod, and the two ends of the needle insertion spring are respectively connected to the needle insertion push block 26-3 and the needle insertion and withdrawal bracket 21. Under the action of the needle insertion pull line 26-2, the needle insertion spring is compressed between the needle insertion push block 26-3 and the needle insertion and withdrawal bracket 21 to store energy; of course, in other embodiments, the needle insertion elastic member 27 can also be a spring sheet structure, and the needle insertion elastic member 27 can also store energy by stretching and deformation. There is no limitation here, and it can be adjusted according to specific circumstances.

Specifically, a card slot can be set on the needle insertion push block 26-3, and the injection needle 8 is partially fixed in the card slot for installation. Of course, in other embodiments, only the connection method between the injection needle 8 and the needle insertion push block 26-3 can also be adjusted according to specific circumstances, which is not limited here.

In this embodiment, referring to Figures 7 and 8 again, the needle withdrawal elastic pushing assembly includes a second guide member 29, a needle withdrawal push block 24, a needle withdrawal elastic member 22 and a connecting member 210; the second guide member 29 is mounted on the needle advance and retreat bracket 21, the needle withdrawal push block 24 and the connecting member 210 are movably mounted on the second guide member 29, the needle withdrawal elastic member 22 is arranged between the connecting member 210 and the needle withdrawal push block 24, the needle withdrawal pull line 23 connects the needle withdrawal push block 24 and the connecting member 210, and makes the needle withdrawal elastic member 2 2 is in the energy storage state; the connecting piece 210 is fixedly connected to the needle insertion push block 26-3, so that the needle withdrawal push block 24, the needle withdrawal elastic piece 22, the connecting piece 210, and the needle withdrawal pull line 23 form an integral module that can move with the needle insertion push block 26-3; the injection needle is also connected to the needle withdrawal push block 24. After the needle withdrawal pull line 23 is melted, the needle withdrawal elastic piece 22 releases its elasticity to push the needle withdrawal push block 24 to move along the second guide piece 29, and the movement of the needle withdrawal push block 24 drives the injection needle to withdraw from the injection site.

Among them, the second guide member 29 adopts a second guide rod, and the needle withdrawal push block 24 adopts a needle entry slider sleeved on the second guide rod, so that the needle withdrawal push block 24 can move along the second guide rod; the connecting member 210 also adopts a slider structure sleeved on the second guide rod; of course, in other embodiments, the second guide member can also be a slide rail structure, and the needle withdrawal push block and the connecting member can also be a slider structure installed on the slide rail. There is no limitation here and it can be adjusted according to specific circumstances.

The needle withdrawal elastic member 22 is a needle withdrawal spring sleeved on the second guide rod, and the two ends of the needle withdrawal spring are respectively connected to the needle withdrawal push block 24 and the connecting member 210. Under the action of the needle withdrawal wire 23, the needle withdrawal spring is compressed between the needle withdrawal push block 24 and the connecting member 210 to store energy; of course, in other embodiments, the needle withdrawal elastic member 22 can also be a spring sheet structure, and the needle withdrawal elastic member 22 can also store energy by stretching and deforming, which is not limited here and can be adjusted according to specific circumstances.

The second guide member 29 and the first guide member 25 are arranged in parallel, and a retaining spring structure is arranged on the ends of the second guide member 29 and the first guide member 25 to fix the second guide member 29 and the first guide member 25 relative to the advance and retreat needle bracket 21 to prevent them from rotating.

Specifically, a card slot can be provided on the needle withdrawal push block 24, and the injection needle 8 is partially fixed in the card slot for installation. Of course, in other embodiments, only the connection method between the injection needle 8 and the needle withdrawal push block 24 can also be adjusted according to specific circumstances, which is not limited here.

Based on the above structural description, the process of advancing and retreating the needle is further explained:

Referring to Figure 7, first, the controller controls the needle insertion pull wire 26-2 to fuse, and the needle insertion elastic member 27 restores the elastic force to push the needle insertion push block 26-3 to move to the right, and the needle insertion push block 26-3 thereby drives the injection needle to move right to achieve needle insertion. In this process, the integral module composed of the needle withdrawal push block 24, the needle withdrawal elastic member 22, the connecting member 210, and the needle withdrawal pull wire 23, driven by the needle insertion push block 26-3, moves rightward along the second guide member 29 until the connecting member 210 reaches the right side of the needle insertion and withdrawal bracket 21, and the injection is completed; then, the controller controls the needle withdrawal pull wire 26-2 to fuse, and the needle withdrawal elastic member 22 restores the elastic force to push the needle withdrawal push block 24 to move to the left, and the needle withdrawal push block 24 drives the injection needle to move left to achieve needle withdrawal.

In this embodiment, the needle insertion heating device 32-3, the needle withdrawal heating device 32-1, and the injection heating device 32-3 can all be implemented by heating wires, and the power supply device 1 can be implemented by batteries. Of course, in other embodiments, the specific structural forms of the needle insertion heating device 32-3, the needle withdrawal heating device 32-1, the injection heating device 32-3, and the power supply device 1 can also be adjusted according to specific circumstances, and are not limited here.

In this embodiment, as shown in FIG1 , the automatic drug delivery device includes a housing, which includes a bottom shell 71 and an upper cover 4, and the upper cover 4 is arranged on the bottom shell 71 to form a space for installing various devices. The drug storage device 5, the injection needle, the automatic injection device 6, the control device 3, the automatic needle insertion device, and the automatic needle withdrawal device are all arranged on the bottom shell 71; the buzzer 42 is arranged on the upper cover 4, and a transparent window 41-1 is also arranged on the upper cover 4 at a position corresponding to the drug storage cavity 51 for observing the injection situation, as shown in FIGS. 9-10 .

In this embodiment, the control device includes a circuit board 31, and the controller 34, the injection heating device 32-3, the needle insertion heating device 32-2, the needle withdrawal heating device 32-1, the alarm light 36, and the sensor 39 are all arranged on the circuit board 31 to realize the connection relationship between each other; the circuit board 31 is also provided with a power interface 35, and the power supply device 1 is connected to the circuit board 31 through the power interface 35; the circuit board 31 is also provided with a buzzer supply power interface 38, and the buzzer 42 is connected to the circuit board 31 through the buzzer supply power interface 38; the circuit board 31 is also provided with a switch 37 for realizing the switching function of the control device.

In this embodiment, the circuit board 31 is first installed on the bottom of the bottom shell 71, and the medicine storage device 5, the automatic injection device 6, the control device 3, the automatic needle insertion device, and the automatic needle withdrawal device are respectively installed at corresponding positions on the bottom shell 71, and ensure that the injection heating device 32-3 on the circuit board 31 is arranged opposite to the injection pull wire 64, the needle insertion heating device 32-2 is arranged opposite to the needle insertion pull wire 26-2, and the needle withdrawal heating device 32-1 is arranged opposite to the needle withdrawal pull wire 23, so as to facilitate rapid heating and fusing.

The automatic injection device 6 is installed on the bottom shell 71 through the injection bracket 61 , and the automatic needle insertion device and the automatic needle withdrawal device are installed on the bottom shell 71 through the needle insertion and withdrawal bracket 21 .

Among them, since the buzzer 42 is arranged on the upper cover 4, it needs to be connected to the buzzer supply electrical interface 38 on the circuit board 31 through the buzzer conductive spring 63 inserted through the injection bracket 61.

In this embodiment, referring to FIGS. 3 and 13 , an injection needle guide block 74 is provided on the bottom shell 71, and a guide hole is provided on the injection needle guide block 74. The guide hole has holes at both ends for the insertion of the injection needle 8, and one end of the guide hole is connected to the inside of the shell, and the other end is connected to the outside of the shell; the injection needle 8 is inserted in the guide hole, moves along the guide hole to extend out of the shell and the guide hole to pierce the injection site for injection, or moves along the guide hole to retract into the guide hole after the injection is completed. The present invention uses the injection guide block 74 to guide the insertion and withdrawal direction of the injection needle 8, so as to ensure that the needle tip of the injection needle 8 pierces or withdraws from the injection site at an accurate angle.

Furthermore, the guide hole in the injection needle guide block 74 is arranged obliquely relative to the bottom of the bottom shell 71, which is conducive to ensuring that the injection needle 8 penetrates into or withdraws from the injection site in an inclined posture.

Furthermore, a first sealing structure 73 is provided on an opening at one end of the guide hole communicating with the interior of the shell; the first sealing structure 73 may specifically be made of sealing silicone, and the injection needle 8 passes through the sealing silicone to enter the guide hole.

In this embodiment, an adhesive layer is provided at the bottom of the bottom shell 71, and the adhesive layer 79 is used to connect the automatic drug delivery device to the injection site. Specifically, the adhesive layer 79 can be a backing sticker with release paper, and the backing sticker is fixed to the bottom of the bottom shell 71 by heat pressing or the like; of course, in other embodiments, the adhesive layer 79 can also be implemented by other methods, which are not limited here and can be adjusted according to specific circumstances.

In this embodiment, a bottom shell bracket 78 is also provided at the bottom of the bottom shell 71, and the bottom shell bracket 78 is pressed on the adhesive layer 79 and is detachably connected to the bottom shell 71. A second sealing structure 75 for sealing the opening is provided on the bottom shell bracket 78 at a position corresponding to the opening of the guide hole toward the outside of the shell. When the bottom shell bracket 78 is installed on the bottom of the bottom shell 71, the second sealing structure seals the opening of the guide hole toward the outside, so that the first sealing structure 73, the second sealing structure 75 and the guide hole constitute a sealing area for sealing the needle tip of the injection needle, thereby ensuring the cleanliness of the injection needle before use and avoiding contamination. When it is needed, the bottom shell bracket 78 is directly removed and pasted to the injection site through the adhesive layer 79.

Furthermore, a second drug inlet connected to the first drug inlet is provided on the bottom shell bracket 78 at a position corresponding to the first drug inlet, and a drug injection needle guide sleeve 77 is provided in the second drug inlet; the drug injection needle passes through the drug injection needle guide sleeve 77, the drug inlet seal 56, and the drug injection needle guide cone 55 in sequence and then extends into the drug storage cavity 51 for injection.

In this embodiment, a power-on silicone button 72 is also provided on the bottom shell 71, which is arranged opposite to the switch 37 on the circuit board 31 inside the bottom shell 71. When the power-on silicone button 72 is pressed, it acts on the switch 37 to realize the power-on function of the device.

In this embodiment, a plurality of waterproof and breathable channels are further provided on the bottom shell 71, and the waterproof and breathable channels are covered with dialysis paper by hot pressing.

The working principle of the automatic drug delivery device provided by the present invention is further described below:

The drug solution is first injected into the drug storage chamber 51 through the second drug inlet and the first drug inlet through the prefilled syringe, and the needle tip of the prefilled syringe filled with the drug solution is inserted into the drug injection needle guide sleeve 77, piercing the drug inlet seal 56, and the drug solution is injected into the drug storage chamber 51 through the drug injection needle guide cone 55; in this process, because the injection needle 8 has a needle tip sealing area, the drug solution pushes the injection piston 54 from the position of Figure 11 to the position of Figure 12, completing the injection and storage of the drug solution.

Remove the bottom shell bracket 78, press the power-on silicone button 72 on the bottom shell 71, and start the switch 37; after powering on, the controller 34, under the control of the software, gives sound and light prompts and alarms through the alarm light 36 and the buzzer 42;

Then remove the release paper on the adhesive backing and stick the entire automatic drug delivery device on the treated human skin;

After a certain period of time, the controller 34 controls the power supply device to supply power to the needle heating device 32-2 for a short time to generate heat. After the heat is generated, the needle heating device 32-2 melts the needle pull wire 26-2, and the needle elastic member 27 pushes the needle push block 26-3 to move. The needle push block 26-3 drives the injection needle 8 installed thereon to move forward, and the injection needle 8 is inserted into the subcutaneous part through the guide hole, as shown in FIG. 13 below;

After the needle is inserted, the controller 34 controls the power supply device 1 to supply power to the injection heating device 32-3 for a short time after a certain period of time to generate heat. After the injection heating device 32-3 is heated, the injection pull wire 64 is melted, the injection elastic member 65 and the injection push rod 68 move, the injection push rod 68 pushes the injection piston 54, and the injection piston 54 pushes the liquid medicine through the injection needle 8 into the human body's subcutaneous tissue to complete the drug administration, as shown in FIG14 ; at the same time, the sensor 39 identifies whether the position of the identification piece 68-1 on the injection push rod is at the bottom, and feeds back to the controller 34, the controller 34 processes the feedback signal, and then gives sound and light prompts and alarms through the alarm light 36 and the buzzer 42;

After the injection is completed, the controller 34 controls the power supply device to supply power to the needle withdrawal heating device 32-1 for a short time to generate heat after a certain period of time. After heating, the needle withdrawal heating device 32-1 melts the needle withdrawal pull wire 23, and the needle withdrawal elastic member 22 restores the elastic force to push the needle withdrawal push block 24 to move to the left. The needle withdrawal push block 24 drives the injection needle 8 to move backward, and the injection needle 8 returns to its original position through the guide hole, thereby realizing the needle withdrawal from the subcutaneous tissue, as shown in Figure 15.

After the needle is removed, the controller 34 controls the alarm light 36 and the buzzer 42 to give an audible and visual prompt and an alarm after a certain period of time, prompting the user to remove the device from the human body.

Those skilled in the art will appreciate that the present invention can be implemented in many other specific forms without departing from its own spirit or scope. Although the implementation of the present invention has been described, it should be understood that the present invention should not be limited to these embodiments, and those skilled in the art can make changes and modifications within the spirit and scope of the present invention as defined by the appended claims.

Claims (8)

1. An automatic drug delivery device, comprising: Automatic needle insertion device; Automatic needle withdrawal device; The automatic needle insertion device comprises: A needle insertion assembly for pushing the injection needle into the injection site; A needle insertion pull wire used to fix the needle insertion assembly and keep it in an energy storage state; A needle heating device is arranged opposite to the needle pull wire, and the needle heating device is connected to a controller; before the automatic injection device administers the drug, the controller controls the needle heating device to be connected to a power supply device, and the needle heating device heats and fuses the needle pull wire after being energized, and after the needle pull wire fuses, the needle assembly releases elasticity to push the injection needle to move and pierce the injection site; The automatic needle withdrawal device comprises: A needle withdrawal assembly for pulling the injection needle out of the injection site; A needle withdrawal pull line used to fix the needle withdrawal assembly and keep it in an energy storage state; A needle withdrawal heating device is arranged opposite to the needle withdrawal pull wire, and the needle withdrawal heating device is connected to the controller; after the automatic injection device administers the drug, the controller controls the needle withdrawal heating device to be connected to the power supply device, and the needle withdrawal heating device is electrically heated to fuse the needle withdrawal pull wire. After the needle withdrawal pull wire is fused, the needle withdrawal assembly releases its elasticity to pull the injection needle out of the injection site. 2. The automatic drug delivery device according to claim 1 is characterized in that the needle insertion assembly includes a needle insertion and withdrawal bracket, a first guide member, a needle insertion push block, and a needle insertion elastic member, the first guide member is installed on the needle insertion and withdrawal bracket, the needle insertion push block is movably installed on the first guide member, the needle insertion elastic member is arranged between the needle insertion push block and the needle insertion and withdrawal bracket, the needle insertion pull wire connects the needle insertion push block and the needle insertion and withdrawal bracket, and makes the needle insertion elastic member in an energy storage state; after the needle insertion pull wire is melted, the needle insertion elastic member releases its elasticity to push the needle insertion push block to move along the first guide member, and drives the injection needle to penetrate into the injection site. 3. The automatic drug delivery device according to claim 2 is characterized in that the first guide member is a first guide rod, the needle insertion elastic member is a needle insertion spring sleeved on the first guide rod, and the two ends of the needle insertion spring are respectively connected to the needle insertion push block and the needle insertion and retraction bracket. 4. The automatic drug delivery device according to claim 2 is characterized in that the needle withdrawal assembly comprises a second guide member, a needle withdrawal push block, a needle withdrawal elastic member and a connecting member; the second guide member is mounted on the needle insertion and withdrawal bracket, the needle withdrawal push block and the connecting member are movably mounted on the second guide member, and the connecting member is fixedly connected to the needle insertion push block; the needle withdrawal elastic member is arranged between the connecting member and the needle withdrawal push block, the needle withdrawal pull wire connects the needle withdrawal push block and the connecting member, and makes the needle withdrawal elastic member in an energy storage state; The injection needle is connected to the needle withdrawal push block. After the needle withdrawal pull wire is melted, the needle withdrawal elastic member releases its elasticity to push the needle withdrawal push block to move along the second guide member. The movement of the needle withdrawal push block drives the injection needle to withdraw from the injection site. 5. The automatic drug delivery device according to claim 4 is characterized in that the second guide member is a second guide rod, the needle withdrawal elastic member is a needle withdrawal spring sleeved on the second guide rod, and the two ends of the needle withdrawal spring are respectively connected to the needle withdrawal push block and the connecting member. 6. The automatic drug delivery device according to claim 1, further comprising an automatic injection device, wherein the automatic injection device comprises an injection push assembly and an injection pull wire for fixing the injection push assembly to place it in an energy storage state. 7. The automatic drug delivery device according to claim 6 is characterized in that the injection push assembly includes an injection bracket, an injection push rod and an injection elastic member; the injection push rod is axially movably installed in the injection bracket, the injection elastic member is arranged between the injection push rod and the injection bracket, the injection pull wire connects the injection push rod and the injection bracket, and makes the injection elastic member in an energy storage state; after the injection pull wire is melted, the injection elastic member releases its elasticity, pushes the injection push rod to move to one side of the drug storage chamber, and the injection push rod pushes the piston assembly to move. 8. The automatic drug delivery device according to claim 6 is characterized in that it also includes a controller, an injection heating device connected to the controller and a power supply device, and the injection heating device is arranged opposite to the injection pull wire; the controller controls the injection heating device to be connected to the power supply device, and the injection heating device heats and fuses the injection pull wire after being energized, and after the injection pull wire is melted, the injection push assembly releases its elasticity to push the piston assembly to move, thereby pushing the medicine in the medicine storage chamber into the injection needle to achieve drug delivery.