Spring motor compound power needle-free syringe

Abstract

The present invention provides a spring motor composite power needle-free syringe, comprising a motor, an energy storage driving member, a striking member, a spring, an ampoule, and an injection push rod installed in the ampoule, wherein the spring is sleeved on the periphery of the striking member, and the motor is used to drive the energy storage driving member to operate by reverse rotation, drive the striking member to move from a first position to a second position, thereby causing the spring to deform and store energy, and the spring releases the stored energy at the second position to cause the striking member to return from the second position to the first position, and while the spring releases the stored energy, the motor drives the energy storage driving member to move by forward rotation to drive the striking member to return from the second position to the first position, thereby striking the injection push rod in the ampoule to achieve injection. The present invention can play a role in both storing spring energy and striking the syringe at the same time, thereby reducing the performance requirements for the motor compared to the prior art, and there is no need to use a large-capacity capacitor as an energy storage element.

Description

Technical Field

[0001] The invention relates to the technical field of medical equipment, in particular to a spring motor composite power needle-free injector. Background Art

[0002] The technology of injecting drugs into the human body in the form of high-speed liquid is called needle-free injection. The power source of needle-free injection is generally to compress the spring and then release it instantly, using the instantaneous explosive force of the spring to complete the needle-free injection. One prior art solution proposes to use a motor to drive a rotating slope to compress the spring to store energy, and then use the discontinuity of the slope to let the spring relax instantly, release energy, and then hit the syringe. Obviously, in this solution, the motor only does work when compressing the spring, and does not play a role in hitting the syringe; another solution proposes a method of using a ball screw to drive needle-free injection, but it requires a sufficiently large motor power and a large-capacity capacitor as an energy storage element. Summary of the invention

[0003] In view of the above-mentioned deficiencies in the prior art, the present invention provides a spring motor composite power needle-free injector to solve the above-mentioned technical problems.

[0004] A spring motor composite powered needle-free syringe comprises a motor, an energy storage driving member, a striking member, a spring, an ampoule and an injection push rod installed in the ampoule, wherein the spring is sleeved on the periphery of the striking member, and the motor is used to drive the energy storage driving member to operate by reverse rotation, drive the striking member to move from a first position to a second position so that the spring is deformed and then stores energy, and the spring releases the stored energy at the second position so that the striking member returns from the second position to the first position, and while the spring releases the stored energy, the motor drives the energy storage driving member to move by forward rotation so as to drive the striking member to return from the second position to the first position, so as to strike the injection push rod in the ampoule to achieve injection.

[0005] Furthermore, the energy storage drive member is a hollow cylindrical rotating member, the top of which is connected to the motor drive, and the side wall is provided with a spiral groove, and the spiral groove is a left-right symmetrical rotating undulating structure; the striking member includes a striking rod, and the head of the striking rod is provided with a spiral slider, and the spiral slider is provided with a sliding rod that can slide along the spiral groove, and the spiral slider of the striking rod extends into the bottom opening of the rotating member, and the sliding rod is placed in the spiral groove, and the spiral slider moves up and down in a straight line with the forward and reverse rotation of the spiral groove.

[0006] Furthermore, a vertical slider is connected to the lower part of the striking rod, the spring is sleeved on the middle part of the striking rod, the vertical slider on the striking rod is slidably matched with the vertical slide groove on the shell, and the spring is located between the vertical slider and the spiral slider.

[0007] Furthermore, the energy storage drive part is a square shaft, the striking part is a screw, the bottom end of the screw is provided with a striking block, the top end of the screw passes through a nut and is connected to the square shaft, and the nut is fixed to the outer shell; a square hole is opened on the top of the screw, the lower end of the square shaft is inserted into the square hole and connected to the screw, and the upper end of the square shaft is driven and connected to the motor shaft of the motor.

[0008] Furthermore, the spring sleeve is arranged on the outside of the screw rod and is located between the striking block and the nut.

[0009] Furthermore, a bearing ball is provided on the nut.

[0010] Furthermore, it also includes a variable ratio gearbox, which includes a roller one-way clutch, a ring gear, a sun gear, a planetary gear, and a clutch shaft; a ring gear is provided on the outer inner circumferential wall of the variable ratio gearbox, the ring gear is meshed with the sun gear through the planetary gear, the motor shaft of the motor is connected to the sun gear, a roller one-way clutch for connecting and disconnecting the sun gear is provided on the clutch shaft, and one end of the clutch shaft is connected to the energy storage drive component.

[0011] Furthermore, when the motor shaft drives the sun gear to rotate in one direction, the roller-type one-way clutch connecting the sun gear and the clutch shaft is in a disengaged state, that is, the motor shaft drives the clutch shaft to rotate through the sun gear, planetary gears, and ring gear; when the motor shaft drives the sun gear to rotate in the opposite direction, the roller-type one-way clutch connecting the sun gear and the clutch shaft is in an engaged state, that is, the motor shaft is directly connected to the clutch shaft through the roller-type one-way clutch.

[0012] The present invention adopts a design that cooperates with the energy storage driving part, the striking part and the spring, so that the motor can not only store energy for the spring by driving the energy storage driving part to cause the striking part to move, but also participate in the work when the spring is released. The force of the composite spring implements the striking action at the same time, and can play a role in both storing spring energy and striking the syringe. Compared with the prior art, this reduces the performance requirements for the motor and does not need to use a large-capacity capacitor as an energy storage element. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the exploded structure of some components of an embodiment of the present invention;

[0014] Figure 2 is a schematic structural diagram of a rotating member in Embodiment 1 of the present invention;

[0015] Figure 3 is a schematic diagram of the decomposed structure of the second embodiment of the present invention;

[0016] Figure 4 This is a schematic diagram of the assembly of the square shaft, the screw rod and the spring in the second embodiment of the present invention;

[0017] Figure 5 is a schematic diagram of the connection between the motor and the variable ratio gearbox in the second embodiment of the present invention;

[0018] Figure 6 It is a schematic diagram of the structure of the second embodiment of the present invention when striking.

[0019] In the figure: 1—motor, 2—rotating part, 21—spiral slide, 22—rotating part housing, 23—motor connection port, 3—strike rod, 31—spiral slider, 32—slide rod, 33—vertical slider, 4—spring, 5—ampoule, 6—injection push rod, 7—ratio gear box, 8—square shaft, 9—screw, 10—nut, 11—motor shaft, 91—strike block, 92—square hole, 6—injection push rod, 71—roller one-way clutch, 72—gear ring, 73—sun gear, 74—planetary gear, 75—clutch shaft. DETAILED DESCRIPTION

[0020] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention.

[0021] See also Figure 1-2 , which is a first embodiment of the spring motor composite power needle-free syringe of the present invention, comprising a motor 1, an energy storage driving member, a striking member, a spring 4, an ampoule 5 and an injection push rod 6 installed in the ampoule 5, wherein the spring 4 is sleeved on the periphery of the striking member, and the motor 1 is used to drive the energy storage driving member to operate by reverse rotation, drive the striking member to move from the first position to the second position, so that the spring 4 is deformed and then stores energy, and the spring 4 releases the stored energy at the second position to make the striking member return from the second position to the first position to strike the injection push rod 6 in the ampoule 5 to achieve injection, while the spring 4 releases the stored energy, the motor 1 drives the energy storage driving member to move by forward rotation to drive the striking member to return from the second position to the first position, that is, while the striking member quickly returns from the second position to the first position under the action of the restoring force of the spring 4, the driving force of the motor 1 is added, so that the motor 1 can play a role in both storing the energy of the spring 4 and striking the syringe at the same time, and can not only compress the spring 4, but also combine the elastic force of the spring 4 when the spring 4 is released to drive the striking member together.

[0022] The motor 1 may be a brushless DC motor, which can output considerable kinetic energy in a very small volume, and the output time, speed and sequence of the kinetic energy can be completely digitally controlled.

[0023] In this embodiment, the energy storage driving member is a rotating member 2, which is a hollow column, with a motor connection port 23 connected to the motor shaft of the motor 1 on the top, and a spiral chute 21 on the side wall. The specific structure of the spiral chute 21 is as follows: Figure 2As shown, the striking member includes a striking rod 3, a spiral slider 31 is provided at the head of the striking rod 3, and a slide bar 32 that can slide along the spiral slide groove 21 is provided on the spiral slider. The spiral slider 31 of the striking rod 3 extends from the bottom opening of the rotating member 2, and the slide bar 32 is placed in the spiral slide groove 21. The spiral slide groove 21 is a left-right symmetrical rotating undulating structure. With the forward and reverse rotation of the spiral slide groove 21, the spiral slider 31 will make an up-and-down linear motion. A rotating member housing 22 is provided on the outside of the spiral slide groove 21.

[0024] The lower part of the striking rod 3 is connected with a vertical slider 33, and the middle part of the striking rod 3 is sleeved with the spring 4, which is located between the vertical slider 33 and the spiral slider 31. The vertical slider 33 on the striking rod 3 cooperates with the vertical slide groove (not shown) of the housing, so that the striking rod 3 can slide vertically.

[0025] The actual operation process is as follows: the motor 1 rotates at the required speed according to the program setting (reverse rotation at this time), drives the spiral slide 21 to rotate, and then drives the spiral slider 31 to move upward along one side of the spiral slide 21. At the starting point, the slide bar 32 of the spiral slider 31 is at the lowest point in the spiral slide 21 (i.e., the first position), and the spring 4 on the striking rod 3 is in a relaxed state. As the spiral slider 31 moves upward, the spring 4 on the striking rod 3 begins to be compressed and accumulate energy. When the slide bar 32 of the spiral slider 31 is at the highest point in the spiral slide 21 (i.e., the second position), the spring 4 on the striking rod 3 is in a compressed state.

[0026] When the slide bar 32 of the spiral slider 31 starts to slide from the highest point to the lowest point in the spiral slide groove 21, the spring 4 on the striking rod 3 releases the stored elastic force, and at the same time, the program-controlled motor 1 outputs kinetic energy (at this time, it is forward rotation), and drives the slide bar 32 of the spiral slider 31 to move downward along the other side of the spiral slide groove 21 through the spiral slide groove 21, so that the motor 1 drives the striking rod 3 to move downward together with the spiral slider 31. In this way, with the forward and reverse rotation of the spiral slide groove 21, the spiral slider 31 will make an up and down linear motion.

[0027] When the spiral slide block 31 slides to the lowest point in the spiral chute 21, the elastic force is released, and the driving combination of the spiral chute 21 and the spiral slide block 31 completes a striking cycle. If continuous striking is required, the program control motor 1 can be set to run continuously.

[0028] See also Figure 3-6 , which is the second embodiment of the spring motor composite power needle-free syringe of the present invention, and the difference between the driving combination of the spiral slide groove 21 and the spiral slider 31 of the first embodiment is that the second embodiment adopts a screw nut driving combination.

[0029] In this embodiment, the spring motor composite powered needle-free injector comprises a motor 1, an energy storage driving part, a striking part, a spring 4, an ampoule 5 and an injection push rod 6 installed in the ampoule 5, wherein the energy storage driving part is a square shaft 8, the striking part is a screw 9, the bottom end of the screw 9 is enlarged to form a striking block 91, the top end of the screw 9 passes through the nut 10 and is connected to the square shaft 8, the nut 8 can be a nut containing a bearing ball, and the nut 8 is fixed together with the outer shell (not shown); the spring 4 is sleeved on the outside of the screw 9 and is located between the striking block 91 and the nut 10.

[0030] A square hole 92 is provided at the top of the screw 9. The lower end of the square shaft 8 is directly inserted into the square hole 92 and connected to the screw 9. The upper end of the square shaft 8 is connected to the motor shaft of the motor 1. When the motor 1 rotates, the square shaft 8 is driven to rotate, thereby driving the screw 9 to rotate forward and reversely. With the help of the nut 8, the screw 9 will move up and down linearly. At the beginning of the operation, the striking block 91 is located at the lowest position (i.e., the first position). There is a certain distance between the nut 8 and the striking block 91 to accommodate the loose spring 4. The program-controlled motor 1 drives the square shaft 8 through the reducer, so that the screw 9 rotates in one direction (for example, clockwise) for multiple turns. Because the rotating screw 9 is restricted by the nut 8, the screw 9 is forced to follow the square shaft 8 while rotating and sliding upward, and the striking block 91 moves upward accordingly, so that the distance between the nut 8 and the striking block 91 changes, and the spring 4 enters a compressed state. When the spring 4 is compressed to the required degree (i.e. the screw 9 moves to the second position), the program-controlled motor 1 drives the square shaft 8 and the screw 9 to rotate in the opposite direction for multiple turns through the reducer, so that the kinetic energy output by the motor 1 is combined with the kinetic energy released by the spring 4, and together drives the striking block 91 to move downward until the spring 4 is completely relaxed, the striking block 91 moves to the lowest point (the first position), and the injection is achieved by striking the injection push rod 6 in the ampoule 5, thus completing a cycle of the striking process. Obviously, in the above process, the screw 9 rotates in both the forward and reverse directions for multiple turns, and by repeating this process, continuous striking can be implemented.

[0031] In the above two implementation examples, when the motor 1 rotates to compress the spring 4 and the motor 1 rotates in the opposite direction, and the force of the composite spring 4 is used to implement the striking rod striking, the energy transmission ratio of the motor 1 is the same. Obviously, this is not the optimal working state of the motor.

[0032] Therefore, the present invention also provides another embodiment 3, that is, a variable ratio gear box 7 is added on the basis of the embodiment 2, such as Figure 5As shown, the variable ratio gearbox 7 includes a roller type one-way clutch 71, a ring gear 72, a sun gear 73, a planetary gear 74, and a clutch shaft 75. A ring gear 72 is provided on the outer inner peripheral wall of the variable ratio gearbox 7, and the ring gear 72 is meshed and connected with the sun gear 73 through the planetary gear 74, the motor shaft 11 of the motor 1 is connected with the sun gear 7, and the clutch shaft 75 can be connected with the sun gear 73 through the roller type one-way clutch 71.

[0033] During operation, the motor shaft 11 drives the sun gear 73 to rotate in one direction (for example, clockwise). At this time, the roller-type one-way clutch 71 connecting the sun gear 73 and the clutch shaft 75 is in a separated state, that is, the motor shaft 11 is not directly connected to the clutch shaft 75, but drives the clutch shaft 75 to rotate through the sun gear 73, the planetary gear 74, and the ring gear 72. Specifically, the clockwise rotating sun gear 73 drives the planetary gear 74 to rotate counterclockwise, and then drives the ring gear 72 and the clutch shaft 75 fixed on the ring gear 72 to rotate clockwise. In short, it is the small gear that drives the large gear to rotate, and the result is that the motor shaft 11 rotates multiple times and the clutch shaft 75 rotates one circle. At this time, the variable ratio gearbox 7 is a reduction gearbox, which is suitable for the application scenarios of the compression spring 4 in the first and second implementation examples.

[0034] Then, the motor shaft 11 drives the sun gear 73 to rotate in the opposite direction. At this time, the roller-type one-way clutch 71 connecting the sun gear 73 and the clutch shaft 75 is in a state of engagement, that is, the motor shaft 11 is directly connected to the clutch shaft 75 through the roller-type one-way clutch 71. The sun gear 73 rotating in the opposite direction directly drives the clutch shaft 75 to rotate through the roller-type one-way clutch 71. The ring gear 72 and the planetary gear 74 are also driven, but there is no relative rotational motion between the ring gear 72, the planetary gear 74 and the sun gear 73. In short, it is the motor shaft 11 that directly drives the clutch shaft 75 to rotate, and the transmission ratio of the variable ratio gearbox is 1:1, which is suitable for the application scenario in which the driving force of the motor 1 in the first and second implementation examples and the elastic force of the composite spring 4 together add force to the striking member to strike the injection push rod of the ampoule.

[0035] In actual use, the size of the gear can be changed, and multi-stage variable ratio gearboxes can be connected in series to achieve optimized function.

[0036] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A spring motor composite power needle-free syringe, characterized in that: The invention comprises a motor, an energy storage driving member, a striking member, a spring, an ampoule and an injection push rod installed in the ampoule, wherein the spring is sleeved on the outer periphery of the striking member, and the motor is used to drive the energy storage driving member to operate by reverse rotation, so as to drive the striking member to move from a first position to a second position, thereby causing the spring to deform and store energy, and the spring releases the stored energy at the second position to cause the striking member to return from the second position to the first position, and while the spring releases the stored energy, the motor drives the energy storage driving member to move by forward rotation, so as to drive the striking member to return from the second position to the first position, thereby striking the injection push rod in the ampoule to realize injection; the energy storage driving member is a hollow column The top of the striking rod is connected to the motor drive, and the side wall is provided with a spiral slide, and the spiral slide is a left-right symmetrical rotating undulating structure; the striking member includes a striking rod, the head of the striking rod is provided with a spiral slider, and the spiral slider is provided with a slide rod that can slide along the spiral slide, and the spiral slider of the striking rod extends from the bottom opening of the rotating member, and the slide rod is placed in the spiral slide, and the spiral slider moves up and down linearly with the forward and reverse rotation of the spiral slide; the lower part of the striking rod is connected with a vertical slider, and the middle part of the striking rod is sleeved with the spring, and the vertical slider on the striking rod is slidably matched with the vertical slide groove on the shell, and the spring Located between the vertical slider and the spiral slider; the energy storage drive member is a square shaft, the striking member is a screw, the bottom end of the screw is provided with a striking block, the top end of the screw passes through the nut and is connected to the square shaft, and the nut is fixed to the shell; a square hole is opened at the top of the screw, the lower end of the square shaft is inserted into the square hole and connected to the screw, and the upper end of the square shaft is connected to the motor shaft of the motor; it also includes a variable ratio gearbox, which includes a roller-type one-way clutch, a gear ring, a sun gear, a planetary gear, and a clutch shaft; a ring gear is provided on the outer inner circumferential wall of the variable ratio gearbox, and the ring gear is meshed and connected to the sun gear through the planetary gear The motor shaft of the motor is connected to the sun gear, and a roller one-way clutch for connecting and separating the sun gear is provided on the clutch shaft, and one end of the clutch shaft is connected to the energy storage drive member; when the motor shaft drives the sun gear to rotate in one direction, the roller one-way clutch connecting the sun gear and the clutch shaft is in a separated state, that is, the motor shaft drives the clutch shaft to rotate through the sun gear, the planetary gear and the ring gear; when the motor shaft drives the sun gear to rotate in the opposite direction, the roller one-way clutch connecting the sun gear and the clutch shaft is in an engaged state, that is, the motor shaft is directly connected to the clutch shaft through the roller one-way clutch.

2. The spring motor composite powered needle-free injector according to claim 1, characterized in that: The spring sleeve is arranged on the outside of the screw rod and between the striking block and the nut.

3. The spring motor composite powered needle-free injector according to claim 1, characterized in that: The nut is provided with a bearing marble.

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