Pulse type needleless injector

Abstract

The invention belongs to the technical field of medical instruments, and particularly relates to a pulse type needleless injector which is small in size, light in weight and capable of completing injection of small medicine and injection of large-dose medicine. By means of the linkage design of driving the sun gear through the lead screw, reducing the speed of the planet gear, rotating the planet carrier and axially moving the sliding seat, the lead screw drives the planet carrier to rotate after reducing the speed of the planet gear, and after the planet carrier rotates, the driving hammer is pushed through the spiral slope to compress the spring to achieve energy storage. A speed reducing mechanism and a compression spring mechanism are integrated, the motor does not need to be additionally provided with an additional speed reducer, and the structure is more compact. A speed reduction mechanism and a spring compression mechanism are integrated, and an independent speed reducer and a large spring assembly needed by a traditional needleless injector are remarkably reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices, and particularly relates to a pulse-type needle-free injector. Background Art

[0002] Traditional syringes deliver drugs by penetrating the skin with a needle, which can cause pain, cross-infection, psychological fear, and medical waste contamination. According to statistics, approximately 30% of the global population suffers from needle phobia, and over one million infections are caused by reused needles each year. Similar problems arise when using traditional needles in animal experiments or animal diagnosis and treatment. Furthermore, due to the animal's lack of cooperation, the needle can bend during the injection process, even causing accidental injuries to personnel.

[0003] Needle-free syringes utilize high-pressure injection technology to deliver drug delivery without the need for needles. These syringes offer significant advantages: painlessness, eliminating the pain of needle punctures and improving comfort; high safety, avoiding needlestick injuries and the risk of cross-infection; ease of use, making them particularly suitable for children, diabetics, those with needle phobias, and animals; and stable efficacy, enabling more uniform aerosol absorption and faster onset of action. Their high efficiency and hygienic properties have led to their widespread use in healthcare, home care, and animal testing, offering an innovative alternative to traditional injections.

[0004] Currently available needle-free injectors primarily utilize a full-stroke spring or high-pressure gas source as their power source, releasing energy instantaneously. This energy is then transmitted through a mechanical mechanism to generate an instantaneous high-pressure jet to complete the injection process. Full-stroke spring-type needle-free injectors compress the spring with a single load. Once released, the spring pushes the ampoule's core rod through the entire long stroke, injecting the entire medication solution in one go. This requires a large spring, typically loaded manually, making it difficult to miniaturize and electrically drive, limiting its use. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems mentioned in the background technology and to provide a pulse needle-free syringe that is small in size and light in weight and can complete both small-dose and large-dose injections.

[0006] In order to achieve the above technical objectives, the technical solution adopted by the present invention is: The present invention discloses a pulse-type needle-free syringe, comprising a housing (1), wherein a motor (2) is provided inside the housing (1), an output end of the motor (2) is connected to a screw rod (2-1), and the rotation of the screw rod (2-1) is controlled by the motor (2); The screw rod (2-1) is sleeved with a planetary frame (5), the center hole of the planetary frame (5) is provided with an internal thread with a lead of P, and the internal thread of the planetary frame (5) is meshed with the screw rod (2-1); The slide (10), the slide middle plate (13) and the slide upper cover (3) are sequentially connected in series and fixedly connected, and the three are sleeved on the outside of the screw rod (2-1); the planetary frame (5) is located in the cavity between the slide upper cover (3) and the slide middle plate (13); A hammer (15) is provided through the slide middle plate (13) and the slide upper cover (3), a spring (14) is sleeved on the outside of the hammer (15), the hammer (15) is provided with a slide protrusion (15-2), one end of the planetary frame (5) is provided with a spiral inclined surface (5-1), and under the compression of the spring (14), the slide protrusion (15-2) and the spiral inclined surface (5-1) are in contact with each other; The spiral inclined surface (5-1) cooperates with the slide protrusion (15-2) on the hammer (15), and the planet carrier (5) compresses the spring (14) and releases it instantaneously every time it rotates one circle; A sun gear (9) is sleeved on the screw rod (2-1), and the sun gear (9) is meshed with a plurality of planetary gears (8). The planetary gears (8) are located between the inner gear ring (10-1) and the sun gear (9), and the planetary gears (8) are meshed with the sun gear (9) and the inner gear ring (10-1). The inner gear ring (10-1) is arranged on the slide (10). When the screw rod (2-1) rotates, it drives the planetary carrier (5) to rotate and drives the sun gear (9) to rotate around the axis, so that the slide (10) is displaced.

[0007] Preferably, the slide cover (3) and the slide (10) are provided with coaxial flat holes, the hammer (15) is coaxial with the flat hole, the flat hole limits the freedom of the hammer (15) to rotate around the axis, and the two ends are respectively located in the two flat holes; the hammer (15) is provided with a boss (15-1), and the two ends of the spring (14) are respectively in contact with the boss (15-1) and the slide cover (3).

[0008] Preferably, a cylindrical groove is provided at the other end of the housing (1), the cylindrical groove being used to install a third bearing (11), the outer ring of the third bearing (11) being located in the cylindrical groove, and the terminal end of the screw rod (2-1) being located in the inner ring of the third bearing (11).

[0009] More preferably, a limited rotation surface (1-1) is provided inside the housing (1), and a limited turntable (10-2) is provided on the slide (10), and the limited turntable (10-2) is in contact with the limited rotation surface (1-1), limiting the rotation of the slide (10) around the axis of the screw rod (2-1).

[0010] Preferably, a first bearing (4) is installed inside the slide cover (3), a second bearing (6) is installed inside the slide middle plate (13), the first bearing (4) and the second bearing (6) are both coaxial with the screw rod (2-1), and the two ends of the planet carrier (5) are respectively located in the inner rings of the first bearing (4) and the second bearing (6).

[0011] Preferably, the sun gear (9) and the screw rod (2-1) are both cut with two planes, the two planes of the sun gear (9) fit the screw rod (2-1), and the screw rod (2-1) can drive the sun gear (9) to rotate around the axis.

[0012] Preferably, the planet carrier (5) is provided with a plurality of pin holes, one end of the plurality of pins (7) is inserted into the pin holes, and the other end is exposed from the pin holes, and the plurality of planetary gears (8) are respectively sleeved on one end of each pin (7).

[0013] Preferably, an ampoule (12) is mounted on one end of the housing (1), and the ampoule (12) is coaxial with the hammer (15). The end face of the core rod (12-1) of the ampoule (12) is in contact with one end of the hammer (15). The planetary carrier drives the helical inclined plane compression spring (14) and releases it instantly after each rotation, pushing the core rod of the ampoule (12) to complete a single pulse injection. Compared with the prior art, the present invention has the following advantages: 1. This invention creatively integrates planetary gear reduction and helical transmission: through a linkage design in which the screw drives the sun gear, the planetary gear reduces speed, the planetary carrier rotates, and the slide moves axially. The screw drives the planetary carrier after being reduced speed by the planetary gear. After the planetary carrier rotates, the spiral bevel pushes the hammer to compress the spring to achieve energy storage. This integrates the reduction mechanism and the compression spring into one, eliminating the need for an additional reducer in the motor and achieving a more compact structure. The integration of the reduction mechanism and the spring compression mechanism significantly reduces the number of independent reducers and large spring assemblies required for traditional needle-free syringes. 2. Unique "rotation-inclined surface-spring" dynamic coupling: When the planetary carrier rotates, the spiral inclined surface pushes the hammer to compress the spring. A single rotation completes a microinjection, supporting microinjection, achieving dose accumulation through repeated cycles, and also enabling large-dose administration. 3. When the planetary carrier rotates one circle, the spring is only compressed a short distance. This process can automatically compress and release the spring to complete a small dose injection. Moreover, since the injection dose in this process is small, the spring force does not need to be very large, which greatly reduces the power requirement of the motor, thereby greatly reducing the volume and weight of the entire device, making it easy to carry. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the existing methods and experiments, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 It is a cross-sectional view of the overall structure of the syringe of the present invention.

[0016] Figure 2 for Figure 1 Middle AA section view.

[0017] Figure 3 This is a partial view of the fit between the spiral ramp and the slide protrusion.

[0018] Names marked in the figure: housing 1, rotation limiting surface 1-1, motor 2, screw 2-1, slide cover 3, first bearing 4, planetary carrier 5, spiral bevel 5-1, second bearing 6, pin 7, planetary gear 8, sun gear 9, slide 10, inner ring gear 10-1, rotation limiting platform 10-2, third bearing 11, ampoule 12, core rod 12-1, slide middle plate 13, spring 14, hammer 15, boss 15-1, slide boss 15-2. DETAILED DESCRIPTION

[0019] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, the present application is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0020] The embodiments of the present invention are described in further detail below with reference to the accompanying drawings.

[0021] like Figure 1-3 As shown, the present invention provides a pulse-type needle-free syringe, including a housing 1, a rotation limiting surface 1-1, a motor 2, a screw 2-1, a slide cover 3, a first bearing 4, a planetary carrier 5, a spiral bevel 5-1, a second bearing 6, a pin 7, a planetary gear 8, a sun gear 9, a slide 10, an inner ring gear 10-1, a rotation limiting platform 10-2, a third bearing 11, an ampoule 12, a core rod 12-1, a slide middle plate 13, a spring 14, a hammer 15, a boss 15-1, and a slide boss 15-2.

[0022] In a preferred embodiment of the present invention, motor 2 is located within housing 1, with the larger end of motor 2 fixed to the top of housing 1. A cylindrical groove for mounting a third bearing 11 is provided within the other end of housing 1, with the outer ring of third bearing 11 positioned within the groove. The output end of motor 2 is connected to screw 2-1, the terminal end of screw 2-1 being positioned within the inner ring of third bearing 11. Driven by motor 2, screw 2-1 can rotate about its axis.

[0023] The slide 10, slide middle plate 13, and slide cover 3 are connected in series and fixedly integrated. They are collectively sheathed around the outside of the screw 2-1 without contacting it. The slide 10, slide middle plate 13, and slide cover 3 are able to slide along the axis of the screw 2-1. A first bearing 4 is mounted within the slide cover 3, and a second bearing 6 is mounted within the slide middle plate 13. Both the first and second bearings 4 and 6 are coaxial with the screw 2-1. The planet carrier 5 is located in the cavity between the slide cover 3 and the slide middle plate 13, with its ends positioned within the inner races of the first and second bearings 4 and 6, respectively.

[0024] The center hole of the planet carrier 5 is provided with an internal thread with a lead of P, which mates with the screw 2-1. The slide 10 is equipped with an internal gear ring 10-1 with φ teeth and is coaxial with the screw 2-1. The sun gear 9, with φ teeth, is mounted outside the screw 2-1 and located in the cavity between the internal gear ring 10-1 and the screw 2-1. One end of the sun gear 9 is adjacent to the slide 10, and the other end is adjacent to the planet carrier 5. Both the sun gear 9 and the screw 2-1 are cut with two flat surfaces, which align with the screw 2-1, allowing the screw 2-1 to drive the sun gear 9 to rotate together about its axis. The planet carrier 5 is provided with multiple pin holes, with one end of multiple pins 7 inserted into the pin holes and the other end emerging from the pin holes. Multiple planetary gears 8 are mounted on one end of each pin 7 and located between the internal gear ring 10-1 and the sun gear 9. The planetary gears 8 mesh with each other, including the sun gear 9 and the internal gear ring 10-1. Therefore, when the screw 2-1 rotates a circle, the planet carrier 5 rotates 1 circle, and the slide 10 moves forward.

[0025] The slide cover 3 and the slide 10 are provided with coaxial flat holes. The hammer 15 is coaxial with the flat holes, with its ends positioned in the two flat holes. Therefore, the hammer can slide along the axis of the flat holes but cannot rotate around them. The hammer 15 is provided with a boss 15-1. The spring 14 is sleeved on the outside of the hammer 15, with its ends respectively abutting against the boss 15-1 and the slide cover 3.

[0026] One end of the planet carrier 5 is provided with a spiral bevel 5-1, and the height difference of one circle of the spiral bevel 5-1 is . The hammer 15 is provided with a slide protrusion 15-2, and under the compression of the spring 14, the slide protrusion 15-2 is in contact with the spiral bevel 5-1.

[0027] A limited rotation surface 1-1 is provided inside the housing 1, and a limited rotation platform 10-2 is provided on the slide 10. The limited rotation platform 10-2 is in contact with the limited rotation surface 1-1, limiting the rotation of the slide 10 around the axis of the screw rod 2-1.

[0028] An ampoule 12 is mounted on one end of the housing 1 , and the ampoule 12 is coaxial with a hammer 15 . An end face of a core rod 12 - 1 of the ampoule 12 is in contact with one end of the hammer 15 .

[0029] The working principle of the pulse needle-free injector provided by the present invention is as follows: First, the preparation stage: when the syringe is working, first reversely rotate the screw 2-1 to move the slide 10 to the position as shown in FIG. Figure 1 Then, the ampoule 12 is filled with liquid medicine and installed at one end of the housing 1, with the end face of the core rod 12-1 in contact with one end of the hammer 15. Figure 1 shown.

[0030] The next step is a small injection: the motor 2 rotates one revolution, and after the planetary gear 8 decelerates, the planetary carrier 5 rotates one revolution, and the slide 10 moves downward. During each rotation of the planetary carrier 5, the hammer 15 is automatically pushed upward by a certain distance, and the spring is simultaneously compressed. When the planetary carrier 5 completes one revolution, the hammer 15 is automatically released, pushing the core rod 12-1 by a certain distance, completing the injection. Because the slide 10 and its mounted components all move downward by this distance during this process, the end face of the core rod 12-1 remains in contact with the end of the hammer 15 after the injection is complete.

[0031] The above injection process is repeated several times continuously to complete the injection of different doses until the entire liquid medicine inside the ampoule bottle 12 is injected.

[0032] The above embodiments are preferred implementations of the present invention, but the implementations of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be considered as equivalent replacement methods and also fall within the scope of protection of the present invention and are included in the scope of protection of the present invention.

Claims

1. A pulse-type needle-free injector, characterized in that: The invention comprises a housing (1), wherein a motor (2) is arranged inside the housing (1), an output end of the motor (2) is connected to a screw rod (2-1), and the rotation of the screw rod (2-1) is controlled by the motor (2); The screw rod (2-1) is sleeved with a planetary frame (5), the center hole of the planetary frame (5) is provided with an internal thread with a lead of P, and the internal thread of the planetary frame (5) is meshed with the screw rod (2-1); The slide (10), the slide middle plate (13) and the slide upper cover (3) are sequentially connected in series and fixedly connected, and the three are sleeved on the outside of the screw rod (2-1); the planetary frame (5) is located in the cavity between the slide upper cover (3) and the slide middle plate (13); A hammer (15) is provided through the slide middle plate (13) and the slide upper cover (3), a spring (14) is sleeved on the outside of the hammer (15), the hammer (15) is provided with a slide protrusion (15-2), one end of the planetary frame (5) is provided with a spiral inclined surface (5-1), and under the compression of the spring (14), the slide protrusion (15-2) and the spiral inclined surface (5-1) are in contact with each other; The spiral inclined surface (5-1) cooperates with the slide protrusion (15-2) on the hammer (15), and the planet carrier (5) compresses the spring (14) and releases it instantaneously every time it rotates one circle; A sun gear (9) is sleeved on the screw rod (2-1), and the sun gear (9) is meshed with a plurality of planetary gears (8). The planetary gears (8) are located between the inner gear ring (10-1) and the sun gear (9), and the planetary gears (8) mesh with the sun gear (9) and the inner gear ring (10-1). The inner gear ring (10-1) is arranged on the slide (10). When the screw rod (2-1) rotates, the screw rod (2-1) drives the planetary carrier (5) to rotate after being decelerated by the planetary gears, and causes the slide (10) to move.

2. A pulse-type needle-free injector according to claim 1, characterized in that: The slide cover (3) and the slide (10) are provided with coaxial flat holes, the hammer (15) is coaxial with the flat hole, the flat hole limits the freedom of the hammer (15) to rotate around the axis, and the two ends are respectively located in the two flat holes; the hammer (15) is provided with a boss (15-1), and the two ends of the spring (14) are respectively in contact with the boss (15-1) and the slide cover (3).

3. The pulse-type needle-free injector according to claim 1, characterized in that: The other end of the housing (1) is provided with a cylindrical groove, the cylindrical groove being used to install a third bearing (11), the outer ring of the third bearing (11) being located in the cylindrical groove, and the terminal end of the screw rod (2-1) being located in the inner ring of the third bearing (11).

4. The pulse-type needle-free injector according to claim 3, characterized in that: A limited rotation surface (1-1) is provided inside the housing (1), and a limited turntable (10-2) is provided on the slide (10). The limited turntable (10-2) is in contact with the limited rotation surface (1-1), limiting the rotation of the slide (10) around the axis of the screw rod (2-1).

5. The pulse-type needle-free injector according to claim 1, characterized in that: A first bearing (4) is installed inside the slide cover (3), and a second bearing (6) is installed inside the slide middle plate (13). The first bearing (4) and the second bearing (6) are both coaxial with the screw rod (2-1), and the two ends of the planet carrier (5) are respectively located in the inner rings of the first bearing (4) and the second bearing (6).

6. The pulse-type needle-free injector according to claim 1, characterized in that: The sun gear (9) and the screw rod (2-1) are both cut with two planes, the two planes of the sun gear (9) fit the screw rod (2-1), and the screw rod (2-1) can drive the sun gear (9) to rotate around the axis.

7. The pulse-type needle-free injector according to claim 1, characterized in that: The planet carrier (5) is provided with a plurality of pin holes, one end of a plurality of pins (7) is inserted into the pin holes, and the other end is exposed from the pin holes, and a plurality of planetary gears (8) are respectively sleeved on one end of each pin (7).

8. The pulse-type needle-free injector according to claim 1, characterized in that: An ampoule (12) is mounted on one end of the housing (1). The ampoule (12) is coaxial with the hammer (15), and an end face of a core rod (12-1) of the ampoule (12) is in contact with one end of the hammer (15).

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