A syringe assisting device and an injection system

Abstract

The present invention provides a syringe assisting device and an injection system. The syringe assisting device includes a housing, a pushing member, an intermediate member, and a pressure receiving member. The pushing member includes a unidirectional driving force receiving portion and a pushing portion. The intermediate member includes a unidirectional driving portion, and the unidirectional driving portion is connected to the unidirectional driving force receiving portion. The pressure receiving member includes a hand-held portion, a pressure receiving driving portion, and an elastic portion. The hand-held portion is rotatably mounted on the housing. The pressure receiving driving portion is connected to the unidirectional driving portion. One end of the elastic portion is connected to the housing, and the other end of the elastic portion is connected to the hand-held portion. Wherein, the hand-held portion on the pressure receiving member has an injection state in which, under the action of an external force, it drives the pressure receiving driving portion to drive the unidirectional driving portion and the unidirectional driving force receiving portion to move synchronously, so as to drive the pushing portion to move in a first direction. After the injection state, the pressure receiving driving portion has a reset state in which, under the driving of the elastic force, it drives the unidirectional driving portion to be disconnected from the unidirectional driving force receiving portion, and only drives the unidirectional driving portion to move in a second direction.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to a syringe assisting device and an injection system. Background Art

[0002] A syringe mainly includes a syringe barrel, a needle and a piston rod. When in use, by moving the piston rod, a pressure change is generated in the syringe barrel to achieve the extraction or injection of the liquid medicine. However, due to different specifications, the external dimensions of syringes are also different, so some syringes of certain specifications have poor user experiences. To solve this problem, an injection gun has been invented. It is shaped like a "pistol", thus having a better user experience. This type of syringe also uses the method of moving the piston rod to achieve injection and liquid extraction.

[0003] A syringe assisting device is disclosed in the prior art, which includes a device body, and also includes a rotating arm, a gear, a rack and a return spring; a syringe is connected above the rack. The rack is slidably installed in the body and meshes with the gear. The rotating arm is connected to the gear. During injection, by pressing the rotating arm, the gear is driven to rotate, thereby driving the rack to move, and then driving the syringe to complete the injection.

[0004] However, in the above syringe assisting device, after a single injection is completed, when the rotating arm rotates under the action of the return spring, it will drive the rack to return to the initial position. Therefore, continuous multiple injections cannot be achieved. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is that in the syringe assisting device in the prior art, after a single injection is completed, when the rotating arm rotates under the action of the return spring, it will drive the rack to return to the initial position. Therefore, continuous multiple injections cannot be achieved.

[0006] For this reason, the present invention provides a syringe assisting device, including:

[0007] A housing;

[0008] A pushing member, which is arranged in the housing. The pushing member includes a unidirectional driving force receiving part and a pushing part. The pushing part is adapted to be connected to a syringe;

[0009] An intermediate member, which is arranged in the housing. The intermediate member includes a unidirectional driving part, and the unidirectional driving part is connected to the unidirectional driving force receiving part;

[0010] A pressure receiving member, which includes a hand-held part, a pressure receiving driving part and an elastic part. The hand-held part is rotatably installed on the housing. The pressure receiving driving part is connected to the unidirectional driving part. One end of the elastic part is connected to the housing, and the other end of the elastic part is connected to the hand-held part;

[0011] Wherein, the handheld portion on the pressure-receiving member has an injection state in which, under the action of an external force, it drives the pressure-receiving driving portion to drive the one-way driving portion and the one-way driving force-receiving portion to move synchronously, so as to drive the injection portion to move in a first direction. And in the injection state, the elastic portion has an elastic force for driving the pressure-receiving driving portion to move proximally; after the injection state, the pressure-receiving driving portion has, under the drive of the elastic force, driven the one-way driving portion to disconnect from the one-way driving force-receiving portion, so that the one-way driving force-receiving portion is in the injection position in the injection state, and drives the one-way driving portion to move in a second direction, where the first direction is opposite to the second direction.

[0012] Optionally, the one-way driving force-receiving portion includes a plurality of connected first ratchet working surfaces and first ratchet back surfaces, the one-way driving portion includes a plurality of connected second ratchet working surfaces and second ratchet back surfaces, the extension direction from the tooth root to the tooth top on the second ratchet working surface forms an angle less than or equal to 90 degrees with the first direction, the extension direction from the tooth root to the tooth top on the first ratchet working surface forms an angle greater than or equal to 90 degrees with the first direction, the extension direction from the tooth root to the tooth top on the second ratchet back surface forms an angle greater than 90 degrees with the second direction, and the extension direction from the tooth root to the tooth top on the first ratchet back surface forms an angle less than 90 degrees with the second direction;

[0013] In the injection state, the second ratchet working surface abuts against the first ratchet working surface to drive the second ratchet working surface and the first ratchet working surface to move synchronously;

[0014] In the reset state, the second ratchet back surface slides on the first ratchet back surface so that the first ratchet back surface remains in the injection position in the injection state.

[0015] Optionally, both the one-way driving force-receiving portion and the one-way driving portion are ratchet racks or

[0016] the one-way driving force-receiving portion is a ratchet wheel and the one-way driving portion is a ratchet rack.

[0017] Optionally, the intermediate member further includes a reset portion. When the second ratchet back surface slides along the second direction on the first ratchet back surface, the reset portion has a first elastic force for driving the one-way driving portion to move in a direction close to the one-way driving force-receiving portion.

[0018] Optionally, it further includes a limiting member, and the limiting member includes a first limiting portion, and the first limiting portion is connected to the guide rail portion on the injection member to limit the injection member.

[0019] Optionally, it further includes a reset member disposed on one side of the intermediate member. The reset member has a disengaged state in which it drives the intermediate member to disengage from the injection member under the action of an external force.

[0020] Optionally, the injection member includes a pulling-back portion that penetrates through the side wall of the housing and extends to the outside of the housing. In the disengaged state, the pulling-back portion has a pulling-back state in which it drives the injection portion to move in the second direction under the action of an external force.

[0021] Optionally, after the pulling-back state, the reset portion has a second elastic force that drives the one-way driving portion to move toward the one-way driving force-receiving portion.

[0022] Optionally, it further includes an adjusting member that can rotate relative to the housing about a rotation center. The adjusting member includes at least one adjusting portion;

[0023] The pressure-receiving member further includes a limiting portion that is adapted to abut against the adjusting portion before the reset state to limit the synchronous movement distance between the one-way driving portion and the one-way driving force-receiving portion in the injection state.

[0024] Optionally, the adjusting member includes a first adjusting portion and a second adjusting portion. The distance from the outer wall of the first adjusting portion to the rotation center is a first distance, and the distance from the outer wall of the second adjusting portion to the rotation center is a second distance. The first distance is greater than the second distance.

[0025] An injection system includes a syringe and a syringe auxiliary device. The syringe auxiliary device is the syringe auxiliary device described above, and the syringe is connected to the injection portion.

[0026] The technical solution provided by the present invention has the following advantages:

[0027] A syringe assisting device provided by the present invention includes a housing, a pushing member, an intermediate member, and a pressing member. The pushing member is disposed inside the housing. The pushing member includes a one-way driving force-receiving portion and a pushing portion. The pushing portion is adapted to be connected to a syringe. The intermediate member is disposed inside the housing. The intermediate member includes a one-way driving portion. The one-way driving portion is connected to the one-way driving force-receiving portion. The pressing member includes a hand-held portion, a pressing driving portion, and an elastic portion. The hand-held portion is rotatably mounted on the housing. The pressing driving portion is connected to the one-way driving portion. One end of the elastic portion is connected to the housing, and the other end of the elastic portion is connected to the hand-held portion. Wherein, the hand-held portion on the pressing member has an injection state in which, under the action of an external force, it drives the pressing driving portion to drive the one-way driving portion and the one-way driving force-receiving portion to move synchronously, so as to drive the pushing portion to move in a first direction. And in the injection state, the elastic portion has an elastic force for driving the pressing driving portion to move proximally. After the injection state, the pressing driving portion has a reset state in which, under the drive of the elastic force, it drives the one-way driving portion to be disconnected from the one-way driving force-receiving portion, so that the one-way driving force-receiving portion is in the injection position in the injection state, and drives the one-way driving portion to move in a second direction. The first direction is opposite to the second direction.

[0028] For the syringe assisting device with this structure, during injection, the outer side of the housing is held by hand, and the hand-held portion on the pressing member is pressed. The hand-held portion rotates relative to the housing, driving the pressing driving portion to move, thereby driving the one-way driving portion connected to the pressing driving portion to move synchronously. The one-way driving portion drives the one-way driving force-receiving portion connected thereto to move synchronously, thereby driving the pushing portion to move along the first direction to realize injection of the syringe connected to the pushing portion. After the injection is completed, the hand-held portion is released. The hand-held portion moves towards the initial position under the drive of the elastic force on the elastic portion, thereby driving the one-way driving portion to move in the second direction. The second direction is opposite to the first direction. Since the one-way driving portion can only drive the one-way driving force-receiving portion to move unidirectionally along the first direction, the pressing driving portion drives the one-way driving portion to be disconnected from the one-way driving force-receiving portion, so that the one-way driving force-receiving portion is in the injection position in the injection state, and only drives the one-way driving portion to move in the second direction. Then, the hand-held portion is pressed again, and the above injection steps are repeated continuously, so as to be able to perform multiple injections on a single syringe, avoiding the situation in the prior art that after a single injection is completed, when the rotating arm rotates under the action of the return spring, it will drive the rack to return to the initial position and multiple continuous injections cannot be realized.

[0029] 2. A syringe assisting device provided by the present invention, wherein the one-way driving force receiving part includes a plurality of connected first ratchet working surfaces and first ratchet back surfaces, the one-way driving part includes a plurality of connected second ratchet working surfaces and second ratchet back surfaces, the included angle between the extending direction from the tooth root to the tooth top on the second ratchet working surface and the first direction is less than or equal to 90 degrees, the included angle between the extending direction from the tooth root to the tooth top on the first ratchet working surface and the first direction is greater than or equal to 90 degrees, the included angle between the extending direction from the tooth root to the tooth top on the second ratchet back surface and the second direction is greater than 90 degrees, and the included angle between the extending direction from the tooth root to the tooth top on the first ratchet back surface and the second direction is less than 90 degrees; in the injection state, the second ratchet working surface abuts against the first ratchet working surface to drive the second ratchet working surface and the first ratchet working surface to move synchronously; in the reset state, the second ratchet back surface slides on the first ratchet back surface so that the first ratchet back surface remains at the injection position in the injection state.

[0030] For the syringe assisting device with this structure, by providing the first ratchet working surface, the first ratchet back surface, the second ratchet working surface and the second ratchet back surface, and the included angle between the extending direction from the tooth root to the tooth top on the second ratchet working surface and the first direction is less than or equal to 90 degrees, and the included angle between the extending direction from the tooth root to the tooth top on the first ratchet working surface and the first direction is greater than or equal to 90 degrees, in the injection state, the second ratchet working surface can abut against the first ratchet working surface, so that under the drive of the pressure-applying driving part, the one-way driving part and the one-way driving force receiving part can be driven to move synchronously to achieve injection.

[0031] By making the included angle between the extending direction from the tooth root to the tooth top on the second ratchet back surface and the second direction greater than 90 degrees, and the included angle between the extending direction from the tooth root to the tooth top on the first ratchet back surface and the second direction less than 90 degrees, in the reset state, when the one-way driving part moves in the second direction under the drive of the pressure-applying driving part, the second ratchet back surface can slide on the first ratchet back surface without driving the first ratchet back surface to move, that is, the one-way driving part only drives the one-way driving part to move, while the one-way driving force receiving part remains at the injection position in the injection state. During the second injection, the one-way driving part can drive the one-way driving force receiving part to move further in the first direction, so as to achieve multiple injections.

[0032] 3. A syringe assisting device provided by the present invention further includes a limiting member, the limiting member includes a first limiting part, and the first limiting part is connected to the guide rail part on the pushing member to limit the pushing member.

[0033] The syringe assisting device of this structure is provided with a limiting member. After the injection state, when the pressed member drives the intermediate member to move in the second direction, in order to prevent the pushing member from being driven to move in the second direction during the movement of the intermediate member in the second direction, the first limiting portion on the limiting member is connected to the guide rail portion on the pushing member, and a sliding groove is formed on the first limiting portion. The sliding groove is in interference fit with the guide rail portion, so that the pushing member can be prevented from moving in the second direction driven by the intermediate member through friction.

[0034] 4. The syringe assisting device provided by the present invention further includes a reset member. The reset member is arranged on one side of the intermediate member. The reset member has a disengaged state in which the intermediate member and the pushing member are driven to be disengaged from contact under the action of an external force. The pushing member includes a pulling-back portion. The pulling-back portion penetrates through the side wall of the housing and extends to the outside of the housing. In the disengaged state, the pulling-back portion has a pulling-back state in which the pushing portion is driven to move in the second direction under the action of an external force.

[0035] The syringe assisting device of this structure is provided with a reset member. The reset member is arranged on one side of the intermediate member. After multiple injections are completed, by pressing the reset member, the reset member drives the intermediate member to move, so that the one-way driving portion on the intermediate member is disengaged from the one-way driving force-receiving portion on the pushing member. At this time, by pulling the pulling-back portion on the pushing member, the pushing member is pulled in the second direction, so that the pushing member is moved to the position where it is located during the first injection, preparing for subsequent injections.

[0036] 5. The syringe assisting device provided by the present invention further includes an adjusting member. The adjusting member can rotate relative to the housing around a rotation center. The adjusting member includes at least one adjusting portion. The pressed member further includes a limiting portion. Before the reset state, the limiting portion is adapted to abut against the adjusting portion to limit the synchronous movement distance of the one-way driving portion and the one-way driving force-receiving portion in the injection state.

[0037] The syringe assisting device of this structure is provided with an adjusting portion. During injection, by rotating the adjusting member, the distance from the outer wall of the adjusting portion to the limiting portion is adjusted, so as to limit the synchronous movement distance of the one-way driving portion and the one-way driving force-receiving portion in the injection state, so that the movement distance of the pushing portion on the pushing member can be limited, and thus the single movement distance of the pushing rod in the syringe connected to the pushing portion can be adjusted to achieve quantitative injection.

[0038] 6. The syringe assisting device provided by the present invention, the adjusting member includes a first adjusting portion and a second adjusting portion. The distance from the outer wall of the first adjusting portion to the rotation center is a first distance, and the distance from the outer wall of the second adjusting portion to the rotation center is a second distance. The first distance is greater than the second distance.

[0039] The syringe assisting device of this structure is provided with a first adjusting part and a second adjusting part. The first distance from the outer wall of the first adjusting part to the rotation center is greater than the second distance from the outer wall of the second adjusting part to the rotation center. That is, when the outer wall of the first adjusting part contacts the outer wall of the limiting part, the pushing part on the pushing member can complete the injection of the first dose for the syringe. When the outer wall of the second adjusting part contacts the outer wall of the limiting part, the pushing part on the pushing member can complete the injection of the second dose for the syringe. Since the first distance is greater than the second distance, the travel of the pushing part at the first distance is less than the travel of the pushing part at the second distance. Therefore, the first injection dose is less than the second injection dose, and thus the adjustment of the single injection dose can be realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0041] Figure 1 It is a schematic structural view of the syringe assisting device provided in the embodiment of the present invention;

[0042] Figure 2 It is a schematic internal structural view of the syringe assisting device provided in the embodiment of the present invention;

[0043] Figure 3 It is a schematic structural view of the pushing member, the intermediate member and the pressure receiving member in the syringe assisting device provided in the embodiment of the present invention;

[0044] Figure 4 For Figure 3 The enlarged structural view of the circled area A in

[0045] Figure 5 It is a schematic structural view of the intermediate member in the syringe assisting device provided in the embodiment of the present invention;

[0046] Figure 6 It is a schematic structural view of the limiting member, the resetting member and the pushing member in the syringe assisting device provided in the embodiment of the present invention;

[0047] Figure 7 It is a schematic structural view of the limiting member in the syringe assisting device provided in the embodiment of the present invention;

[0048] Figure 8 It is a schematic structural view of the adjusting member and the pressure receiving member in the syringe assisting device provided in the embodiment of the present invention;

[0049] Description of Reference Numerals

[0050] 1 - Housing

[0051] 2 - Pushing member; 21 - Unidirectional driving force - receiving part; 211 - First ratchet working surface; 212 - First ratchet back surface; 22 - Pushing part; 23 - Guide rail part; 24 - Pull - back part

[0052] 3 - Intermediate member; 31 - Unidirectional driving part; 311 - Second ratchet working surface; 312 - Second ratchet back surface; 32 - Reset part; 33 - Connecting part

[0053] 4 - Compressed member; 41 - Hand - held part; 42 - Compression - driven part; 43 - Elastic part; 44 - Limiting part

[0054] 5 - Limiting member; 51 - First limiting part

[0055] 6 - Reset member

[0056] 7 - Adjusting member; 71 - First adjusting part; 72 - Second adjusting part Detailed Embodiment

[0057] Next, the technical solution of the present invention will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0058] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0059] Embodiment 1

[0060] This embodiment provides a syringe - assisting device, as Figures 1 to 8 shown. The syringe - assisting device includes a housing 1, a pushing member 2, an intermediate member 3, a compressed member 4, a limiting member 5, a reset member 6, and an adjusting member 7. Among them, as Figure 2As shown, the syringe plunger 2 is disposed inside the housing 1. The syringe plunger 2 is connected to the pressure-receiving member 4 through the intermediate member 3. The pressure-receiving member 4 is rotatably connected to the housing 1. One side of the intermediate member 3 is connected to the reset member 6. One end of the syringe plunger 2 is connected to the limiting member 5. The adjusting member 7 is connected to the housing 1 and is disposed on one side of the pressure-receiving member 4.

[0061] As Figure 2 and Figure 3 shown, the syringe plunger 2 includes a one-way driving force-receiving portion 21 and a syringe portion 22. The intermediate member 3 includes a one-way driving portion 31. The one-way driving portion 31 is connected to the one-way driving force-receiving portion 21. The pressure-receiving member 4 includes a hand-held portion 41, a pressure-receiving driving portion 42, and an elastic portion 43. The hand-held portion 41 is rotatably mounted on the housing 1. The pressure-receiving driving portion 42 is connected to the one-way driving portion 31. One end of the elastic portion 43 is connected to the housing 1, and the other end of the elastic portion 43 is connected to the hand-held portion 41.

[0062] Among them, the hand-held portion 41 on the pressure-receiving member 4 has an injection state in which, under the action of an external force, it drives the pressure-receiving driving portion 42 to drive the one-way driving portion 31 and the one-way driving force-receiving portion 21 to move synchronously, so as to drive the syringe portion 22 to move in the first direction. And in the injection state, the elastic portion 43 has an elastic force for driving the pressure-receiving driving portion 42 to move proximally; after the injection state, the pressure-receiving driving portion 42 has, under the drive of the elastic force, driven the one-way driving portion 31 to disconnect from the one-way driving force-receiving portion 21, so that the one-way driving force-receiving portion 21 is in the injection position in the injection state, and drives the one-way driving portion 31 to move in the second direction. The first direction and the second direction are opposite. Among them, as Figure 2 shown, the first direction is the negative direction of the X-axis, and the second direction is the positive direction of the X-axis.

[0063] When injecting, as Figure 2 and Figure 3As shown, by holding the outside of the housing 1 with the hand and pressing the handheld portion 41 on the pressure-receiving member 4, the handheld portion 41 rotates counterclockwise around the point O, driving the pressure-receiving driving portion 42 to move, thereby driving the one-way driving portion 31 connected to the pressure-receiving driving portion 42 to move synchronously. The one-way driving portion 31 drives the one-way driving force-receiving portion 21 connected thereto to move synchronously, thereby driving the injection portion 22 to move along the first direction, that is, the negative direction of the X-axis, so as to realize a single injection of the syringe connected to the injection portion 22. After the single injection is completed, the hand releases the handheld portion 41, and the handheld portion 41 rotates clockwise around the point O under the driving of the elastic force of the elastic portion 43, thereby driving the one-way driving portion 31 to move in the second direction, that is, the positive direction of the X-axis. Since the one-way driving portion 31 can only drive the one-way driving force-receiving portion 21 to move unidirectionally in the first direction, the pressure-receiving driving portion 42 drives the one-way driving portion 31 to disconnect from the one-way driving force-receiving portion 21, so that the one-way driving force-receiving portion 21 is in the injection position in the injection state, and only drives the one-way driving portion 31 to move in the second direction. Then, continue to press the handheld portion 41 and repeat the above steps of pressing the handheld portion 41 for injection. Since the one-way driving force-receiving portion 21 is still in the injection position in the injection state, pressing the handheld portion 41 again enables the one-way driving force-receiving portion 21 to drive the one-way driving portion 31 to continue to move, thereby enabling multiple injections of a single syringe, so as to avoid the situation in the prior art that after a single injection is completed, when the rotating arm rotates under the action of the return spring, it will drive the rack to return to the initial position and multiple continuous injections cannot be achieved.

[0064] As Figure 4 and Figure 5 shown, the one-way driving force-receiving portion 21 includes a plurality of connected first ratchet working surfaces 211 and first ratchet back surfaces 212, and the one-way driving portion 31 includes a plurality of connected second ratchet working surfaces 311 and second ratchet back surfaces 312. The extension direction from the tooth root to the tooth top on the second ratchet working surface 311 forms an angle less than or equal to 90 degrees with the first direction, so that in the injection state, the second ratchet working surface 311 can abut against the first ratchet working surface 211, thereby enabling the one-way driving portion 31 and the one-way driving force-receiving portion 21 to move synchronously under the drive of the pressure-receiving driving portion 42 to achieve injection;

[0065] As Figure 4 and Figure 5 shown, the extension direction from the tooth root to the tooth top on the first ratchet working surface 211 forms an angle greater than or equal to 90 degrees with the first direction, the extension direction from the tooth root to the tooth top on the second ratchet back surface 312 forms an angle greater than 90 degrees with the second direction, and the extension direction from the tooth root to the tooth top on the first ratchet back surface 212 forms an angle less than 90 degrees with the second direction;

[0066] In the reset state, when the one-way driving part 31 moves in the second direction driven by the pressure-driven part 42, the back surface 312 of the second ratchet can slide on the back surface 212 of the first ratchet without driving the back surface 212 of the first ratchet to move. That is, the one-way driving part 31 only drives the one-way driving part 31 to move, while the one-way driving and stress-bearing part 21 remains at the injection position in the injection state. During the second injection, the one-way driving part 31 can continue to drive the one-way driving and stress-bearing part 21 to move further in the first direction, thereby realizing multiple injections. Among them, both the one-way driving and stress-bearing part 21 and the one-way driving part 31 are ratchet racks.

[0067] In other alternative embodiments, the one-way driving and stress-bearing part 21 is a ratchet wheel, and the one-way driving part 31 is a ratchet rack.

[0068] As Figure 3 shown, the intermediate member 3 further includes a reset part 32. One end of the reset part 32 is connected to the one-way driving part 31, and the other end abuts against the housing 1. When the back surface 312 of the second ratchet slides in the second direction on the back surface 212 of the first ratchet, the reset part 32 has a first elastic force that drives the one-way driving part 31 to move in the direction close to the one-way driving and stress-bearing part 21. When the one-way driving part 31 moves in the second direction driven by the pressure-driven part 42, it can always be in contact with the one-way driving and stress-bearing part 21. After the one-way driving part 31 stops moving, the one-way driving part 31 can still drive the one-way driving and stress-bearing part 21 to move in the first direction at any time, which is convenient for the next injection.

[0069] In other alternative embodiments, the reset part 32 can be a spring. One end of the spring is connected to the side of the one-way driving part 31 close to the handheld part 41, and the other side of the spring is connected to the housing 1. The spring can drive the one-way driving part 31 to move in the direction close to the one-way driving and stress-bearing part 21.

[0070] As Figure 3 shown, a connecting part 33 is provided between the one-way driving part 31 and the reset part 32. An arc-shaped opening is provided on the side of the connecting part 33 close to the pressure-driven part 42. The pressure-driven part 42 is clamped in the arc-shaped opening and is slidably connected to the side wall of the arc-shaped opening. When the pressure-driven part 42 is driven by the handheld part 41 to rotate around the point O, since the pressure-driven part 42 is slidably connected to the side wall of the arc-shaped opening, it can ensure that the rotating pressure-driven part 42 can drive the connecting part 33 to move along the X-axis direction.

[0071] As Figure 2 、 Figure 6 and Figure 7As shown, the limiting member 5 includes a first limiting portion 51. The first limiting portion 51 is connected to the guide rail portion 23 on the injection member 2 to limit the injection member 2. By providing the limiting member 5, after the injection state, when the pressed member 4 drives the intermediate member 3 to move in the second direction, in order to prevent the injection member 2 from being driven to move during the movement of the intermediate member 3 in the second direction, the first limiting portion 51 on the limiting member 5 is connected to the guide rail portion 23 on the injection member 2, and a sliding groove is provided on the first limiting portion 51. The sliding groove is in interference fit with the guide rail portion 23, so that the injection member 2 can be prevented from moving in the second direction driven by the intermediate member 3 through friction force.

[0072] As Figure 2 and Figure 6 shown, the reset member 6 is provided on one side of the intermediate member 3. The reset member 6 has a disengaged state in which it drives the intermediate member 3 to disengage from the injection member 2 under the action of an external force. As Figure 2 shown, the pulling portion 24 penetrates through the side wall of the housing 1 and extends to the outside of the housing 1. In the disengaged state, the pulling portion 24 has a pulling state in which it drives the injection portion 22 to move in the second direction under the action of an external force. After the pulling state, the reset portion 32 has a second elastic force that drives the one-way driving portion 31 to move toward the one-way driving force receiving portion 21.

[0073] By providing the reset member 6 on one side of the intermediate member 3, after multiple injections are completed, by pressing the reset member 6 along the negative direction of the Y axis, the reset member 6 drives the intermediate member 3 to move, so that the one-way driving portion 31 on the intermediate member 3 is disengaged from the one-way driving force receiving portion 21 on the injection member 2. At this time, by pulling the pulling portion 24 on the injection member 2, the injection member 2 is pulled in the second direction, so that the injection member 2 is moved to the position where it was at the first injection. The reset member 6 is released. At this time, the one-way driving portion 31 contacts the one-way driving force receiving portion 21 under the action of the second elastic force, preparing for subsequent continuous injections.

[0074] As Figure 2 and Figure 8 shown, the adjusting member 7 can rotate relative to the housing 1 around the rotation center. The adjusting member 7 includes an adjusting portion; the pressed member 4 further includes a limiting portion 44. Before the reset state, the limiting portion 44 is adapted to abut against the adjusting portion to limit the synchronous movement distance between the one-way driving portion 31 and the one-way driving force receiving portion 21 during the injection state.

[0075] By providing the adjusting portion, during injection, by rotating the adjusting member 7, the distance from the outer wall of the adjusting portion to the limiting portion 44 is adjusted, so as to limit the synchronous movement distance between the one-way driving portion 31 and the one-way driving force receiving portion 21 during the injection state, so that the movement distance of the injection portion 22 on the injection member 2 can be limited, and thus the single movement distance of the plunger rod in the syringe connected to the injection portion 22 can be adjusted to achieve quantitative injection.

[0076] Specifically, in this embodiment, as Figure 8 shown, the adjusting member 7 includes a first adjusting portion 71 and a second adjusting portion 72. The distance from the outer wall of the first adjusting portion 71 to the rotation center is a first distance, and the distance from the outer wall of the second adjusting portion 72 to the rotation center is a second distance. The first distance is greater than the second distance.

[0077] By providing the first adjusting portion 71 and the second adjusting portion 72, the first distance from the outer wall of the first adjusting portion 71 to the rotation center is greater than the second distance from the outer wall of the second adjusting portion 72 to the rotation center. That is, when the outer wall of the first adjusting portion 71 contacts the outer wall of the limiting portion 44, the pushing portion 22 on the pushing member 2 can complete the injection of the first dose for the syringe. When the outer wall of the second adjusting portion 72 contacts the outer wall of the limiting portion 44, the pushing portion 22 on the pushing member 2 can complete the injection of the second dose for the syringe. Since the first distance is greater than the second distance, the stroke of the pushing portion 22 moving at the first distance is less than the stroke of the pushing portion 22 moving at the second distance. Therefore, the first injection dose is less than the second injection dose, and thus the adjustment of the single injection dose can be achieved.

[0078] In other alternative embodiments, the adjusting member 7 may include one adjusting portion. During injection, the adjusting portion abuts against the side wall of the limiting portion 44, thereby restricting the synchronous moving distance of the one-way driving portion 31 and the one-way driving force receiving portion 21 in the injection state, and thus being able to restrict the moving distance of the pushing portion 22 on the pushing member 2 to control the single injection amount.

[0079] In other alternative embodiments, the adjusting member 7 may further include more than three adjusting portions.

[0080] For the syringe assisting device of this embodiment, during injection, as Figure 2 and Figure 3 shown, by holding the outside of the housing 1 with the hand and pressing the hand-held portion 41 on the pressure-receiving member 4, the hand-held portion 41 rotates relative to the housing 1, driving the pressure-receiving driving portion 42 to move, thereby driving the one-way driving portion 31 connected to the pressure-receiving driving portion 42 to move synchronously. The one-way driving portion 31 drives the one-way driving force receiving portion 21 connected thereto to move synchronously, thereby driving the pushing portion 22 to move along the first direction to achieve the injection of the syringe connected to the pushing portion 22. After the injection is completed, the hand releases the hand-held portion 41, and the hand-held portion 41 moves to the initial position under the driving of the elastic force of the elastic portion 43, thereby driving the one-way driving portion 31 to move in the second direction;

[0081] After multiple injections are completed, by pressing the reset member 6, the reset member 6 drives the intermediate member 3 to move, so that the one-way driving portion 31 on the intermediate member 3 is disengaged from the one-way driving force receiving portion 21 on the injection member 2. At this time, by pulling the pulling portion 24 on the injection member 2, the injection member 2 is pulled in the second direction, so as to move the injection member 2 to the position where it was located during the first injection. Then the reset member 6 is released. At this time, the one-way driving portion 31 contacts the one-way driving force receiving portion 21 under the action of the second elastic force, preparing for subsequent injections.

[0082] When the injection dose needs to be adjusted, rotate the adjusting member 7, thereby adjusting the distance from the outer wall of the adjusting portion to the limiting portion, so as to limit the synchronous movement distance of the one-way driving portion 31 and the one-way driving force receiving portion 21 in the injection state, thereby being able to limit the movement distance of the injection portion 22 on the injection member 2, and thus being able to adjust the single movement distance of the plunger rod in the syringe connected to the injection portion 22 to achieve quantitative injection.

[0083] Embodiment 2

[0084] This embodiment provides an injection system, including a syringe and a syringe auxiliary device. The syringe auxiliary device is the syringe auxiliary device in Embodiment 1, and the syringe is connected to the injection portion 22.

[0085] For the injection system of this embodiment, since the syringe auxiliary device provided in the above embodiment is adopted, multiple quantitative injections can be performed on the same syringe during injection, and the injection dose can be adjusted each time, which can improve the injection efficiency.

[0086] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A syringe assist device, characterized in that, Comprising: A housing (1); A pushing member (2), which is arranged inside the housing (1). The pushing member (2) includes a one-way driving force-receiving part (21) and a pushing part (22), and the pushing part (22) is adapted to be connected to a syringe; An intermediate member (3), which is arranged inside the housing (1). The intermediate member (3) includes a one-way driving part (31), and the one-way driving part (31) is connected to the one-way driving force-receiving part (21); A pressure-receiving member (4), which includes a hand-held part (41), a pressure-receiving driving part (42) and an elastic part (43). The hand-held part (41) is rotatably mounted on the housing (1), the pressure-receiving driving part (42) is connected to the one-way driving part (31), one end of the elastic part (43) is connected to the housing (1), and the other end of the elastic part (43) is connected to the hand-held part (41); Wherein, the hand-held part (41) on the pressure-receiving member (4) has an injection state in which, under the action of an external force, it drives the pressure-receiving driving part (42) to drive the one-way driving part (31) and the one-way driving force-receiving part (21) to move synchronously, so as to drive the pushing part (22) to move in a first direction. And in the injection state, the elastic part (43) has an elastic force for driving the pressure-receiving driving part (42) to move proximally; after the injection state, the pressure-receiving driving part (42) has, under the drive of the elastic force, driven the one-way driving part (31) to disconnect from the one-way driving force-receiving part (21), so that the one-way driving force-receiving part (21) is in the injection position in the injection state, and drives the one-way driving part (31) to move in a second direction, where the first direction is opposite to the second direction; The one-way driving force-receiving part (21) includes a plurality of connected first ratchet working surfaces (211) and first ratchet back surfaces (212), the one-way driving part (31) includes a plurality of connected second ratchet working surfaces (311) and second ratchet back surfaces (312). The extension direction of the tooth root to the tooth top on the second ratchet working surface (311) forms an angle less than or equal to 90 degrees with the first direction, the extension direction of the tooth root to the tooth top on the first ratchet working surface (211) forms an angle greater than or equal to 90 degrees with the first direction, the extension direction of the tooth root to the tooth top on the second ratchet back surface (312) forms an angle greater than 90 degrees with the second direction, and the extension direction of the tooth root to the tooth top on the first ratchet back surface (212) forms an angle less than 90 degrees with the second direction; In the pushing state, the second ratchet working surface (311) abuts against the first ratchet working surface (211) to drive the second ratchet working surface (311) to move synchronously with the first ratchet working surface (211); In the reset state, the second ratchet back surface (312) slides on the first ratchet back surface (212) so that the first ratchet back surface (212) remains in the injection position in the injection state; The one-way driving force receiving part (21) and the one-way driving part (31) are both ratchet racks, or the one-way driving force receiving part (21) is a ratchet wheel, and the one-way driving part (31) is a ratchet rack; The intermediate member (3) further includes a reset part (32). When the back surface (312) of the second ratchet tooth slides along the second direction on the back surface (212) of the first ratchet tooth, the reset part (32) has a first elastic force for driving the one-way driving part (31) to move towards the one-way driving force receiving part (21).

2. The syringe assisting device according to claim 1, wherein, It further includes a limiting member (5). The limiting member (5) includes a first limiting part (51). The first limiting part (51) is connected to the guide rail part (23) on the injection part (2) to limit the injection part (2).

3. The syringe assisting device according to claim 1, wherein, It further includes a reset member (6). The reset member (6) is arranged on one side of the intermediate member (3). The reset member (6) has a disengaged state in which the intermediate member (3) and the injection part (2) are driven to be disengaged from contact under an external force.

4. The syringe assisting device according to claim 3, wherein The injection part (2) includes a pulling-back part (24). The pulling-back part (24) passes through the side wall of the housing (1) and extends to the outside of the housing (1). In the disengaged state, the pulling-back part (24) has a pulling-back state in which the injection part (22) is driven to move in the second direction under an external force.

5. The syringe assisting device according to claim 4, wherein after the pulling-back state, the reset part (32) has a second elastic force for driving the one-way driving part (31) to move towards the one-way driving force receiving part (21).

6. The syringe assisting device according to claim 1 or 5, wherein it further includes an adjusting member (7). The adjusting member (7) can rotate relative to the housing (1) around a rotation center. The adjusting member (7) includes at least one adjusting part; The pressure receiving part (4) further includes a limiting part (44). Before the reset state, the limiting part (44) is adapted to abut against the adjusting part to limit the synchronous movement distance between the one-way driving part (31) and the one-way driving force receiving part (21) in the injection state.

7. The syringe assisting device according to claim 6, wherein, The adjusting member (7) includes a first adjusting part (71) and a second adjusting part (72). The distance from the outer wall of the first adjusting part (71) to the rotation center is a first distance, and the distance from the outer wall of the second adjusting part (72) to the rotation center is a second distance. The first distance is greater than the second distance.

8. An injection system, characterized in that, It includes a syringe and a syringe assisting device. The syringe assisting device is the syringe assisting device according to any one of claims 1-7. The syringe is connected to the injection part (22).

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