An injection needle

Abstract

The application discloses an injection puncture needle and belongs to the field of medical devices. The injection puncture needle comprises an injection main body, a puncture rod and a needle head assembly arranged in sequence from a proximal end to a distal end. The puncture rod has an injection liquid channel extending in a first direction to communicate the injection liquid channels on the injection main body side and the needle head assembly side. The injection main body comprises an injection liquid supply assembly for inputting and containing injection liquid, an injection liquid pipeline having one end communicated with the injection liquid supply assembly and the other end communicated with the puncture rod, and a control assembly comprising a firing assembly for operatively controlling the action of the injection liquid supply assembly and a transmission assembly between the firing assembly and the injection liquid supply assembly. The transmission assembly comprises at least one gear and rack transmission group, and the transmission assembly transmits the firing force of the firing assembly to the injection liquid supply assembly to realize the injection operation. The injection puncture needle can realize one-hand operation and continuous fixed-dose injection.

Description

Technical Field

[0001] This invention relates to the field of surgical instruments, and in particular to an injection puncture needle. Background Technology

[0002] For certain surgical procedures, it is often necessary to directly inject solutions onto the surface or inside the target organ or tissue. For example, in lung nodule localization surgery, staining reagents such as methylene blue are injected directly onto the surface of the lung tissue to physically locate the nodules. Or, in liver surgery, contrast agents such as ICG are injected directly into the target organ or tissue. Such injections often require the use of quantitative injection devices.

[0003] Currently used quantitative injection devices typically require an external syringe to be connected to the needle end of the injection needle for administration. These devices usually require an assistant to operate the external syringe, while the surgeon operates the needle under laparoscopy to inject the needle into the target organ or tissue. This makes single-person, single-handed operation impossible, and precise quantitative injection is also unattainable. Especially for micro-volume injections of less than 1 ml, the hysteresis effect of the syringe piston under pressure and the precision of the scale on the syringe barrel make it difficult to control the injection dose, thus preventing precise quantitative injection. Summary of the Invention

[0004] Therefore, this invention proposes an injection puncture needle that can be operated with one hand and achieve continuous fixed-dose injection.

[0005] To address the aforementioned technical problems, the present invention provides the following technical solution: An injection puncture needle includes an injection body, a puncture rod, and a needle assembly arranged sequentially from proximal to distal. The puncture rod has an injection fluid channel extending in a first direction to connect the injection fluid channels on the injection body side and the needle assembly side. The injection body includes: an injection fluid supply assembly for inputally receiving injection fluid; an injection fluid tubing, one end of which is connected to the injection fluid supply assembly and the other end of which is connected to the puncture rod; and a control assembly including a firing assembly that operablely controls the movement of the injection fluid supply assembly, and a transmission assembly located between the firing assembly and the injection fluid supply assembly. The transmission assembly includes at least one set of gear and rack transmission groups, and the transmission assembly transmits the firing force of the firing assembly to the injection fluid supply assembly to realize the injection operation.

[0006] In some embodiments of the present invention, the injection body includes an injection shell, and the firing assembly is reciprocating along a first direction, including a firing button located at least partially on the proximal outer side of the injection shell and a push rod located on the inner side of the injection shell.

[0007] In some embodiments of the present invention, the injection supply assembly includes a cartridge bottle body for containing injection solution, a cartridge bottle piston slidably connected to a first end of the cartridge bottle body, and a connecting sleeve fixedly connected to a second end of the cartridge bottle body; the injection solution pipeline is connected to the cartridge bottle body through the connecting sleeve.

[0008] In some embodiments of the present invention, the connecting sleeve is further provided with an injection inlet, which extends to the outside of the injection housing and is adapted to be compatible with a syringe.

[0009] In some embodiments of the present invention, the transmission assembly includes two sets of gear and rack transmission assemblies, each including a first rack disposed on the push rod, a transmission gear assembly rotatably connected to a first gear on the injection shell, and a second rack fixed to the cartridge piston; wherein, the transmission gear assembly includes a first gear and a second gear meshing with each other, the first gear and the first rack being disengaged and driven in a disengaging manner, and the second gear and the second rack being meshed in a meshing manner.

[0010] In some embodiments of the present invention, a clutch assembly for disengaging the transmission assembly from its transmission state is also included. The clutch assembly includes a third gear coaxially arranged with the first gear and a biasing member. The third gear is meshed with the first rack. The first gear and the third gear are respectively provided with mutually meshing one-way ratchet teeth on opposite sides. The biasing member acts on the first gear or the third gear and is adapted to provide a biasing force that puts the one-way ratchet teeth between them into a meshing state.

[0011] In some embodiments of the present invention, the control assembly further includes a shut-off valve for controlling the on / off state of the injection fluid pipeline, and the firing assembly is also used to control the action of the shut-off valve.

[0012] In some embodiments of the present invention, the injection tubing includes at least one deformable delivery tube, and the shut-off valve acts on the outside of the deformable delivery tube, causing it to deform in two states: opening the liquid flow channel and closing the liquid flow channel.

[0013] In some embodiments of the present invention, the shut-off valve is pivotally connected to the injection housing and switches between a first pivot position and a second pivot position under the action of the firing assembly. When the shut-off valve is in the first pivot position, the injection fluid line is in an open state; when the shut-off valve is in the second pivot position, the injection fluid line is in a closed state.

[0014] In some embodiments of the present invention, when the firing assembly reciprocates along a first direction, the push rod of the firing assembly acts on the shut-off valve.

[0015] In some embodiments of the present invention, the shut-off valve includes a pivoting body and a triggering part and a driving part located on both sides of the pivoting body, the triggering part cooperating with the outer wall of the deformable conveying pipe, and the driving part cooperating with the push rod.

[0016] In some embodiments of the present invention, the distal end of the push rod is provided with a limiting part, which is inserted and engaged with the driving part of the shut-off valve so that the shut-off valve moves synchronously with the push rod.

[0017] In some embodiments of the present invention, the firing assembly further includes a return spring located between the push rod and the injection housing, the return spring being adapted to provide a proximal biasing force to the push rod, wherein, in an initial state, the shut-off valve is in the second pivot position under the action of the return spring.

[0018] In some embodiments of the present invention, a positioning plate perpendicular to a first direction is provided on the proximal side of the push rod, and a guide shaft extending along the first direction is provided on the positioning plate. The reset spring is sleeved on the guide shaft, with one end abutting against the positioning plate and the other end abutting against a spring support plate inside the injection shell.

[0019] In some embodiments of the present invention, the guide shaft extends along a first direction to the proximal outer side of the injection housing, and the firing button is engaged with the proximal end of the guide shaft.

[0020] The technical solution of the present invention has the following technical effects compared with the prior art: The injection puncture needle provided by this invention includes an injection solution supply component within the injection body that can accommodate multiple doses of injection solution. Before injection, the injection solution can be fed into the injection solution supply component, eliminating the need for an external syringe during injection. The operator can operate the puncture needle with one hand. Simultaneously, the control component of the puncture needle includes a firing component and a transmission component. The transmission component transmits the firing force of the firing component to the injection solution supply component to achieve the injection operation. The transmission component employs a gear and rack transmission assembly to achieve single-quantitative injection of the injection solution. Attached Figure Description

[0021] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, which will help to understand the purpose and advantages of the present invention, wherein: Figure 1 This is a schematic diagram of a specific embodiment of the injection puncture needle of the present invention; Figure 2 An exploded view of a specific embodiment of the injection puncture needle of the present invention; Figure 3 This is a partial cross-sectional view of a specific embodiment of the injection puncture needle of the present invention in a non-firing state. Figure 4This is a partial cross-sectional view of a specific embodiment of the injection puncture needle of the present invention in the firing state; Figure 5 This is a schematic diagram of a specific embodiment of the shut-off valve in the injection puncture needle of the present invention; Figure 6 This is a schematic diagram of a specific embodiment of the push rod in the injection puncture needle of the present invention; Figure 7 This is a schematic diagram of a specific embodiment of the injection supply component in the injection puncture needle of the present invention. Figure 8 This is a schematic diagram of a specific embodiment of the connecting cannula in the injection puncture needle of the present invention; Figure 9 This is a schematic diagram of the structure of the injection body of the injection puncture needle of the present invention after the injection shell is removed; Figure 10 This is a schematic diagram of some components of the injection body in the injection puncture needle of the present invention; Figure 11 This is a schematic diagram of the clutch assembly in the injection puncture needle of the present invention. Detailed Implementation

[0022] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0025] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0026] In various embodiments of the present invention, "distal / side" refers to the end of the injection puncture needle that is away from the operator during operation, while "proximal / side" refers to the end / side of the injection puncture needle that is close to the operator during operation.

[0027] The following is a specific embodiment of the injection puncture needle of the present invention. Generally, the injection puncture needle described herein is a medical device used in minimally invasive surgery for injecting treatment into tissues of various organs such as the kidneys, liver, lungs, and breasts. However, it should be noted that the injection puncture needle can also be used in open surgery.

[0028] Reference Figure 1 As shown, an embodiment of the injection puncture needle 100 of the present invention includes an injection body 10, a puncture rod 20, and a needle assembly 30 arranged sequentially from proximal to distal end, all three having injection fluid channels. The needle assembly 30 is used to insert into a target organ or tissue within the patient's body to perform an injection operation. The puncture rod 20 has a channel along a first direction (…). Figure 1 The injection channel extends in the X direction to connect the injection body 10 side with the needle assembly 30 side. Typically, the puncture rod 20 is constructed as a slender, rigid tube with a length of approximately 0.1-0.5m for use in internal surgical procedures such as thoracic or abdominal cavities.

[0029] At least a portion of the injection body 10 is held by the operator, allowing the operator to manipulate the injection needle 100 to perform the injection operation. The injection body 10 includes an injection shell 11, which can be formed by a first half-shell 11a and a second half-shell 11b detachably connected. In one specific embodiment, the user can push the injection liquid towards the needle assembly 30 by operating a control component such as a firing button 151 located on the outside of the injection shell 11 to perform the injection operation.

[0030] Specifically, such as Figures 2-4As shown, the injection body 10 includes an injection solution supply assembly 12, which is used to contain and supply injection solution, and can be connected to an external syringe to input injection solution; an injection solution tubing 13, which connects the injection solution supply assembly 12 and the puncture rod 20, with one end connected to the injection solution supply assembly 12 and the other end connected to the puncture rod 20; and a control assembly, which includes a firing assembly 15, a transmission assembly 16 located between the firing assembly 15 and the injection solution supply assembly 12, and a shut-off valve 14 that controls the opening and closing of the injection solution tubing 13. The firing assembly 15 operably controls the operation of the injection solution supply assembly 12 and the shut-off valve 14. That is, the operator can operate the firing assembly 15, for example, by firing the button 151, to control the operation of the injection solution supply assembly 12 to achieve continuous quantitative delivery of injection solution, and at the same time, cause the shut-off valve 14 to operate, thereby opening or closing the injection solution tubing 13, so as to achieve control of the injection operation. The specific implementation structure and working principle will be described in detail below.

[0031] Specifically, in one embodiment of the injection puncture needle 100 of the present invention, the injection fluid pipeline 13 includes at least one deformable delivery tube 131. For example, the deformable delivery tube 131 is made of an elastically deformable material such as rubber, which can elastically deform under the action of external force, causing the flow area of ​​the pipeline channel to change between 0-100%. The shut-off valve 14 acts on the outside of the deformable delivery tube 131, causing it to deform in two states: opening the fluid flow channel and closing the fluid flow channel. Specifically, the shut-off valve 14 is pivotally connected to the injection housing 11 and switches between a first pivot position and a second pivot position under the action of the firing element. When the shut-off valve 14 is in the first pivot position, it triggers the deformable delivery tube 131 to be in a fluid flow conducting state, that is, the injection fluid pipeline 13 is in an open state; when the shut-off valve 14 is in the second pivot position, it triggers the elastic deformation of the deformable delivery tube 131 to be in a fluid flow cut-off state, that is, the injection fluid pipeline 13 is in a closed state. In other alternative embodiments, the injection line 13 can be a rigid line as a whole, and the shut-off valve 14 is installed on the rigid line. The shut-off valve 14 is controlled by electric or mechanical means to open or close the injection line 13.

[0032] Specifically, in one embodiment of the injection puncture needle 100 of the present invention, the firing assembly 15 can reciprocate along a first direction to open or close the injection fluid tubing 13, and simultaneously achieve quantitative delivery of the injection fluid; the firing assembly 15 includes a firing button 151 located at least partially on the proximal outer side of the injection housing 11 and a push rod 152 located on the inner side of the injection housing 11. Specifically, a positioning plate 1521 perpendicular to the first direction is provided on the proximal side of the push rod 152, and a guide shaft 1522 extending along the first direction is provided on the positioning plate 1521. The proximal end of the guide shaft 1522 extends to the proximal outer region of the injection housing 11, and the firing button 151 is engaged with the proximal end of the guide shaft 1522. Pressing the trigger button 151 can drive the push rod 152 to move to the distal side. The distal end of the push rod 152 acts on the shut-off valve 14, causing the shut-off valve 14 to swing around the pivot axis, and further driving the injection fluid line 13 to open, and controlling the injection fluid in the injection fluid supply assembly 12 to flow along the injection fluid line 13 to the distal needle assembly 30 side.

[0033] Reference Figure 5 In one specific embodiment of the present invention, the shut-off valve 14 includes a pivot body 141 and a trigger part 142 and a drive part 143 respectively located on both sides of the pivot body 141. The pivot body 141 is constructed as a generally circular sleeve structure, which can rotate around a pivot axis. The trigger part 142 and the drive part 143 are respectively arranged to protrude radially along the outer wall of the pivot body 141. The trigger part 142 cooperates with the outer wall of the deformable conveying pipe 131, that is, the free end of the trigger part 142 abuts against the outer wall of the deformable conveying pipe 131. The drive part 143 cooperates with the push rod 152. When the push rod 152 moves in a first direction, the drive part 143 of the shut-off valve 14 moves with the push rod 152 and drives the pivot body 141 to rotate around the pivot axis by a set angle, so that the trigger part 142 acts on the pipe wall of the deformable conveying pipe 131. More specifically, as shown in the figure... Figure 6As shown, the distal end of the push rod 152 is provided with a limiting part 1523 for cooperating with the drive part 143 of the shut-off valve 14. The limiting part 1523 is inserted into the drive part 143 of the shut-off valve 14 so that the drive part 143 of the shut-off valve 14 moves synchronously with the push rod 152. For example, the limiting part 1523 of the push rod 152 is constructed as a U-shaped limiting groove structure, and the drive part 143 of the shut-off valve 14 is constructed as a rod suitable for insertion into the limiting groove. The rod extends perpendicular to the first direction, and the two groove walls of the limiting groove are perpendicular to the first direction to limit the position of the rod along the first direction, so that the drive part 143 moves synchronously with the push rod 152. In other alternative embodiments, the structural forms of the limiting part 1523 and the driving part 143 can be interchanged, that is, the limiting part 1523 of the push rod 152 adopts a plug structure, and the driving part 143 adopts a slot structure, which can also achieve the limiting of the shut-off valve 14.

[0034] In the initial non-injection state, i.e., before the operator triggers the firing button 151, the injection fluid line 13 of the present invention needs to be kept closed to prevent injection fluid from entering the injection fluid line 13 and causing leakage. Therefore, as follows... Figures 2-4 As shown, the firing assembly 15 further includes a return spring 153 located between the push rod 152 and the injection housing 11. The return spring 153 is adapted to provide a proximal biasing force to the push rod 152. In the initial state, the shut-off valve 14 is in the second pivot position under the action of the return spring 153. Specifically, the inner side of the injection housing 11 is provided with a spring support plate 111 that is spaced apart from and parallel to the positioning plate 1521. The return spring 153 is sleeved on the guide shaft 1522, with one end abutting against the positioning plate 1521 and the other end abutting against the spring support plate 111 on the inner side of the injection housing 11.

[0035] The injection solution supply assembly 12 includes a cartridge vial body 121 for containing the injection solution, a cartridge vial piston 122 slidably connected to a first end of the cartridge vial body 121, and a connecting sleeve 123 fixedly connected to a second end of the cartridge vial body 121; the injection solution line 13 is connected to the cartridge vial body 121 through the connecting sleeve 123. By controlling the cartridge vial piston 122, the injection solution in the cartridge vial body 121 can be driven to flow along the connecting sleeve 123 into the injection solution line 13, and continue to flow along the injection channel of the puncture rod 20 to the needle assembly 30 side, and then injected into the target tissue.

[0036] like Figure 8As shown, the connecting sleeve 123 is also provided with an injection inlet 123a adapted to be compatible with an external syringe. The injection inlet 123a extends to the outside of the injection shell 11. Before starting the injection, the injection solution needs to be injected into the cartridge body 121 through an external syringe, and then the puncture needle is controlled by the control component to inject a quantitative amount into the target tissue.

[0037] The injection tubing 13 also includes a rigid delivery tube 132 connected to the deformable delivery tube 131. In one specific embodiment, such as... Figure 9 As shown, the rigid delivery tube 132 is constructed as a split-type pipeline structure, comprising a first section 1321 and a second section 1322. The first section 1321 is formed within the push rod 152 and extends along a first direction. The second section 1322 is fixedly connected to the push rod 152 and communicates with the first section 1321. The other end of the second section 1322 is slidably inserted into the injection tubing of the puncture rod 20. Figure 6 As shown, the push rod 152 has a connector 1524 formed on it, communicating with the first section tube 1321. The deformable delivery tube 131 communicates with the first section tube 1321 through the connector 1524. When the push rod 152 is operably moved relative to the injection housing 11 in a first direction, the second section tube 1322 moves synchronously with the push rod 152, and the distal region of the second section tube 1322 slides along the injection channel of the puncture rod 20. In an alternative embodiment, the rigid delivery tube 132 can be constructed as an integral tubing with a closed proximal end and an open distal end, which can be directly fixedly installed on the injection housing 11. The open end of the rigid delivery tube 132 is connected to the injection channel of the puncture rod 20 through a transition connector or directly plugged in. This type of tubing does not move with the push rod 152. In one specific embodiment of the present invention, reference is made to Figure 3 , Figure 4 as well as Figure 9 As shown, the control component of the injection body 10 also includes a transmission component 16 located between the firing component 15 and the cartridge piston 122. The transmission component 16 is used to transmit the firing force of the firing component 15 to the cartridge piston 122, so that the injection liquid in the cartridge body 121 flows along the injection liquid line 13 to the puncture rod 20 and the needle assembly 30 side to realize the injection operation.

[0038] Specifically, such as Figure 3 , Figure 4 as well as Figure 9As shown, the transmission assembly 16 includes a first rack 161 disposed on the push rod 152, the first rack 161 extending along a first direction and rotatably connected to a transmission gear set on the injection housing 11, and a second rack 162 fixed to the cartridge piston 122. The transmission gear set includes a first gear 163 and a second gear 164 meshing with each other, the first gear 163 engaging with the first rack 161 in a disengaging transmission manner, and the second gear 164 engaging with the second rack 162. When the push rod 152 is moved distally by the firing button 151, the first rack 161 on the push rod 152 is connected to the first gear 163, which drives the second gear 164 to rotate, thereby driving the second rack 162 to move distally. The cartridge piston 122 moves distally accordingly, and the injection fluid inside the cartridge body 121 is squeezed by the cartridge piston 122 and flows along the connecting sleeve 123 into the injection fluid pipeline 13, and then flows into the target tissue through the puncture rod 20 and the needle assembly 30.

[0039] The puncture needle of the present invention can control the moving distance of the cartridge piston 122 by setting the number of teeth of the first rack 161 and the transmission step distance of the transmission component 16, thereby controlling the injection volume of the puncture needle in a single injection, so that the injection volume of the puncture needle in a single injection remains constant and is not affected by the magnitude of the firing force on the firing component 15 or the moving distance of the firing component 15.

[0040] To enable multiple quantitative injections with the puncture needle, the injection body 10 of the puncture needle also includes a clutch assembly 17 for disengaging the transmission gear set, such as... Figure 10 , Figure 11 As shown, the clutch assembly 17 includes a third gear 171 coaxially arranged with the first gear 163 and a biasing member 172. The first rack 161 on the push rod 152 meshes with the third gear 171. The first gear 163 and the third gear 171 have interlocking one-way ratchet teeth 1631 / 1711 on opposite sides. The biasing member 172 acts on either the first gear 163 or the third gear 171, providing a biasing force to engage the one-way ratchet teeth 1631 / 1711. Specifically, the biasing member 172 is a compression spring.

[0041] During injection, the firing force is transmitted from the first rack 161 on the push rod 152 to the third gear 171. Under the action of the biasing member 172, the one-way ratchet 1711 on the third gear 171 meshes with the one-way ratchet 1631 of the first gear 163. The one-way ratchet drive surface transmits power and drives the first gear 163 to rotate synchronously, which in turn drives the second gear 164 to rotate. Finally, the power is transmitted to the cartridge piston 122 through the second rack 162, causing the cartridge piston 122 to move distally to the first position, thus achieving one injection. Operation: After an injection operation is completed, when the push rod 152 returns to its initial position proximally under the action of the return spring 153, the third gear 171 rotates in the opposite direction. Since the second gear 164 is stationary and the first gear 163 remains stationary, the one-way ratchet 1711 of the third gear 171 begins to disengage along the inclined surface of the one-way ratchet 1631 of the first gear 163, causing the first gear 163 to separate from the third gear 171, releasing the transmission state of the transmission assembly 16, and finally keeping the cartridge piston 122 in the first position. When fired again, the firing power is transmitted from the first rack 161 on the push rod 152 to the third gear 171. Under the action of the biasing member 172, the one-way ratchet 1711 on the third gear 171 meshes with the one-way ratchet 1631 of the first gear 163. The one-way ratchet drive surface transmits power and drives the first gear 163 to rotate synchronously. The power is then transmitted to the cartridge piston 122 through the second gear 164 and the second rack 162 in the transmission assembly 16, causing the cartridge piston 122 to move to the second position, thus realizing the injection operation again. Repeating the above process can realize multiple quantitative injections of the puncture needle.

[0042] Specifically, the gear module m of the first gear 163 and the third gear 171 is generally 0.3-3, preferably 0.3-0.5. The gear modules can be the same or different. The module m and the number of teeth Z of the first gear 163 and the third gear 171 can be the same or different. However, the number of unidirectional ratchet teeth 1631 / 1711 between them is the same, and the number of ratchet teeth Z2 of the first gear 163 must be greater than or equal to the number of teeth Z1 of the first gear 163, ensuring that the first gear 163 and the third gear 171 can completely separate during reset. The angle of the inclined plane of the unidirectional ratchet teeth 1631 / 1711 is generally 5°-89°, preferably 25°-60°.

[0043] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. An injection puncture needle, comprising an injection body, a puncture rod, and a needle assembly arranged sequentially from proximal to distal end, wherein the puncture rod has an injection fluid channel extending in a first direction to connect the injection fluid channels on the injection body side and the needle assembly side; characterized in that, The injection body includes: An injection solution supply assembly that can be used to receive injection solutions; The injection tubing has one end connected to the injection supply assembly and the other end connected to the puncture rod; The control assembly includes a firing assembly that operably controls the movement of the injection supply assembly, and a transmission assembly located between the firing assembly and the injection supply assembly. The transmission assembly includes at least one set of gear and rack transmissions that transmit the firing force of the firing assembly to the injection supply assembly to achieve the injection operation.

2. The injection puncture needle according to claim 1, characterized in that, The injection body includes an injection housing, and the firing assembly is reciprocating along a first direction, including a firing button located at least partially on the proximal outer side of the injection housing and a push rod located on the inner side of the injection housing.

3. The injection puncture needle according to claim 2, characterized in that, The injection solution supply assembly includes a cartridge bottle body for containing the injection solution, a cartridge bottle piston slidably connected to a first end of the cartridge bottle body, and a connecting sleeve fixedly connected to a second end of the cartridge bottle body; the injection solution pipeline is connected to the cartridge bottle body through the connecting sleeve.

4. The injection puncture needle according to claim 3, characterized in that, The connecting sleeve is also provided with an injection inlet, which extends to the outside of the injection shell and is adapted to be used with a syringe.

5. The injection puncture needle according to claim 3, characterized in that, The transmission assembly includes two sets of gear and rack transmission assemblies, each including a first rack disposed on the push rod, a transmission gear assembly rotatably connected to the injection shell, and a second rack fixed to the cartridge piston; wherein, the transmission gear assembly includes a first gear and a second gear meshing with each other, the first gear and the first rack being disengaged and driven in a disengaging manner, and the second gear and the second rack being meshed in a meshing manner.

6. The injection puncture needle according to claim 5, characterized in that, It also includes a clutch assembly for disengaging the transmission assembly from its transmission state. The clutch assembly includes a third gear coaxially arranged with the first gear and a biasing member. The third gear meshes with the first rack. The first gear and the third gear are respectively provided with interlocking one-way ratchet teeth on opposite sides. The biasing member acts on the first gear or the third gear and is adapted to provide a biasing force that puts the one-way ratchet teeth between them into an interlocking state.

7. The injection puncture needle according to claim 1, characterized in that, The control assembly also includes a shut-off valve for controlling the on / off of the injection fluid pipeline, and the firing assembly is also used to control the action of the shut-off valve.

8. The injection puncture needle according to claim 7, characterized in that, The injection tubing includes at least one deformable delivery tube, and the shut-off valve acts on the outside of the deformable delivery tube, causing it to deform in two states: opening the liquid flow channel and closing the liquid flow channel.

9. The injection puncture needle according to claim 8, characterized in that, The shut-off valve is pivotally connected to the injection housing and switches between a first pivot position and a second pivot position under the action of the firing assembly. When the shut-off valve is in the first pivot position, the injection fluid line is in the open state; when the shut-off valve is in the second pivot position, the injection fluid line is in the closed state.

10. An injection puncture needle according to claim 7, characterized in that, When the firing assembly reciprocates along the first direction, the push rod of the firing assembly acts on the shut-off valve.

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