CN118340564A - Puncture needle clamping device and puncture mechanism - Google Patents

Abstract

The invention provides a puncture needle clamping device and a puncture mechanism. The puncture needle clamping device comprises a clamping knob, a cam, a lifter, a puncture needle chuck and a hollow fastening shaft core. The clamping knob is used for driving the cam to rotate. The cam is provided with a supporting ring, and a plurality of supporting points along the circumference of the supporting ring are provided with different heights along the axial direction of the supporting ring. The first end of the lifter is provided with a plurality of cam rollers, and the second end of the lifter is fixedly connected with the first end of the puncture needle chuck. The plurality of cam rollers are respectively connected with the supporting rings and move between the supporting points along with the rotation of the cams. The second end of the puncture needle holder is provided with a radial elastic structure for clamping the puncture needle in a fastening state and releasing the puncture needle in a loosening state. The fastening shaft core surrounds the periphery of the puncture needle clamping head and is used for fastening the retracted puncture needle clamping head and loosening the extended puncture needle clamping head.

Description

Puncture needle clamping device and puncture mechanism

Technical Field

The present invention relates to the technical field of medical devices, and in particular to a puncture needle clamping device and a puncture mechanism.

Background technique

At present, puncture surgical robots are widely used in various clinical surgical scenarios such as machine hair transplantation and percutaneous puncture. In the terminal puncture mechanism of the puncture surgical robot, a puncture needle clamping device is required to have the clamping function of the tool. During the operation, the puncture needle tool needs to be clamped and replaced multiple times according to the wear of the puncture needle tool. However, due to the complex structure and low clamping efficiency, the existing puncture needle clamping device cannot realize the functions of rapid clamping and rapid replacement during the operation.

In order to overcome the above-mentioned defects in the prior art, there is an urgent need in the art for an improved puncture needle clamping device for quickly clamping and replacing the puncture needle, so that the operation is convenient and fast, and the clamping is stable and reliable.

Summary of the invention

A brief summary of one or more aspects is given below to provide a basic understanding of these aspects. This summary is not an exhaustive overview of all conceived aspects, and is neither intended to identify the key or decisive elements of all aspects nor to define the scope of any or all aspects. Its only purpose is to give some concepts of one or more aspects in a simplified form as a prelude to a more detailed description that will be given later.

In order to overcome the above-mentioned defects of the prior art, the present invention provides a puncture needle clamping device and a puncture mechanism, which can drive the puncture needle clamp to extend and retract axially by setting a cam and cooperating with multiple cam rollers to clamp or release the puncture needle, and is used for quickly clamping and replacing the puncture needle, so that the operation is convenient and fast, and the clamping is stable and reliable.

Specifically, the puncture needle clamping device provided according to the first aspect of the present invention comprises a clamping knob, a cam, a lifter, a puncture needle chuck and a hollow fastening shaft core. The clamping knob is used to drive the cam to rotate. The cam is provided with a support ring. A plurality of support points along the circumference of the support ring have different heights along the axial direction of the support ring. A plurality of cam rollers are provided at the first end of the lifter, and a second end thereof is fixedly connected to the first end of the puncture needle chuck. The plurality of cam rollers are respectively connected to the support ring, and move between the support points as the cam rotates, so as to drive the puncture needle chuck to extend and retract axially according to the height of each support point. A radial elastic structure is provided at the second end of the puncture needle chuck, which is used to clamp the puncture needle in a tightened state and release the puncture needle in a loose state. The hollow fastening shaft core surrounds the periphery of the puncture needle chuck, and is used to tighten the retracted puncture needle chuck and loosen the extended puncture needle chuck.

Further, in some embodiments of the present invention, the clamping knob drives the cam to rotate in an off-axis manner. A first gear is provided at a first end of the clamping knob. A second gear is provided at a first end corresponding to the cam. The first gear meshes with the second gear to drive the cam to rotate in an off-axis manner via the second gear.

Further, in some embodiments of the present invention, the first gear has a smaller first number of teeth, and the second gear has a larger second number of teeth. The first gear performs a decelerated off-axis transmission to the second gear based on a corresponding transmission ratio, so as to drive the puncture needle chuck to perform a quantitative axial movement through the decelerated off-axis rotation of the cam.

Further, in some embodiments of the present invention, the inner ring of the first gear is provided with a first keyway. The first end of the clamping knob is provided with a second keyway. The first end of the clamping knob is circumferentially fixedly connected to the first gear via a first positioning key located in the first keyway and the second keyway. The second gear is fixedly connected to the cam via a cam shaft. The inner ring of the second gear is provided with a third keyway. The first end of the cam shaft is provided with a fourth keyway. The second gear is circumferentially fixedly connected to the first end of the cam shaft via a second positioning key located in the third keyway and the fourth keyway. The second end of the cam shaft is provided with a plurality of circumferential limiting grooves. The outer side of the cam is provided with a plurality of circumferential limiting protrusions. The second end of the cam shaft is circumferentially fixedly connected to the cam via a circumferential limiting protrusion located in each of the circumferential limiting grooves. The outer side of the cam shaft is provided with a retaining ring groove extending around the circumference thereof, and the axial displacement of the second gear is limited via a retaining ring installed in the retaining ring groove.

Further, in some embodiments of the present invention, the lifter is connected to the puncture needle chuck via a rotating shaft core. A raised portion is provided in the middle of the rotating shaft core. The first end of the raised portion is non-fixedly connected to the second end of the lifter, and drives the puncture needle chuck to extend axially under its axial push. The second end of the raised portion is connected to the first end of the fastening shaft core via an elastic member, and is used to drive the puncture needle chuck to synchronously retract axially after the lifter retracts. The second gear, the cam shaft, the cam and the lifter are all annular structures. The second end of the rotating shaft core extends into the hollow part of the fastening shaft core to be fixedly connected to the first end of the puncture needle chuck, and its first end passes through the lifter, the cam, the cam shaft and the second gear in sequence to connect the rotating mechanism, and is used to drive the puncture needle chuck and the puncture needle clamped therein to rotate under the drive of the rotating mechanism.

Furthermore, in some embodiments of the present invention, the puncture needle clamping device further includes a spindle housing and a protective device. The spindle housing at least surrounds the outer sides of the lifter and the fastening shaft core, and is connected to the fastening shaft core via multiple sets of bearings to protect the lifter and the fastening shaft core, and support the fastening shaft core to rotate therein. The protective device is disposed on the spindle housing to limit the ejection of the spindle housing.

Further, in some embodiments of the present invention, the support ring includes a first support area corresponding to the tightened state, a second support area corresponding to the relaxed state, and a third support area between the first support area and the second support area. The first support area includes a plurality of first support points that are less than the tightening critical height, and the height of each of the first support points first decreases and then increases, so that the cam roller in the tightened state automatically stabilizes at the first support point with the lowest height. The second support area includes a plurality of second support points that are greater than the relaxed critical height, and the height of each of the second support points first decreases and then increases, so that the cam roller in the relaxed state automatically stabilizes at the second support point with the lowest height. The third support area includes a plurality of third support points between the tightening critical height and the relaxed critical height, and the height of each of the third support points increases from the first support area to the second support area, so as to provide a gradually enhanced rotation feel.

Furthermore, in some embodiments of the present invention, a plurality of critical third support points in the third support area adjacent to the first support area and/or the second support area have a sudden increase in height, so as to provide a sudden increase in rotational feel prompt when the cam roller passes through the plurality of critical third support points, and/or a sound prompt of the cam roller hitting the critical third support point.

Furthermore, in some embodiments of the present invention, the puncture needle clamping device also includes a photoelectric switch and a U-shaped photoelectric sensor. The photoelectric switch is arranged on the clamping knob and rotates with the rotation of the clamping knob. The photoelectric switch is provided with arc-shaped fan blades, which are used to block the sensing area of the U-shaped photoelectric sensor in the tightened state to control the U-shaped photoelectric sensor to be in the closed state, and to expose the sensing area of the U-shaped photoelectric sensor in the relaxed state to control the U-shaped photoelectric sensor to be in the open state. The U-shaped photoelectric sensor is used to receive the light signal of the sensing area in the open state, and convert the light signal into an electrical signal output to turn on the warning light indicating reset.

In addition, the puncture mechanism provided according to the second aspect of the present invention includes a puncture needle and the puncture needle clamping device provided by the first aspect of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

The above features and advantages of the present invention can be better understood after reading the detailed description of the embodiments of the present disclosure in conjunction with the following drawings. In the drawings, the components are not necessarily drawn to scale, and components with similar related properties or features may have the same or similar reference numerals.

FIG1 is a schematic structural diagram of a puncture needle clamping device according to some embodiments of the present invention.

FIG. 2 is a schematic diagram showing the internal structure of a puncture needle clamping device according to some embodiments of the present invention.

FIG3 shows a schematic cross-sectional view of a puncture needle clamping device according to some embodiments of the present invention.

FIG. 4 is a schematic diagram showing the structural assembly of a puncture needle clamping device according to some embodiments of the present invention.

FIG. 5 is a schematic diagram showing the structural assembly of a clamping knob and a first gear according to some embodiments of the present invention.

FIG. 6 shows a schematic structural diagram of a first gear provided according to some embodiments of the present invention.

FIG. 7 is a schematic structural diagram of a cam shaft provided according to some embodiments of the present invention.

FIG. 8 is a schematic structural diagram of a cam provided according to some embodiments of the present invention.

FIG. 9 is a schematic plan view of a support ring of a cam according to some embodiments of the present invention.

FIG. 10 is a schematic structural diagram of a puncture needle clamping device according to some embodiments of the present invention.

Detailed ways

The following specific embodiments illustrate the implementation of the present invention, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this invention are limited to this implementation. On the contrary, the purpose of introducing the invention in conjunction with the implementation is to cover other options or modifications that may be extended based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will include many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description.

In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

In addition, the terms "upper", "lower", "left", "right", "top", "bottom", "horizontal" and "vertical" used in the following description should be understood as the directions shown in the paragraph and the related drawings. Such relative terms are only used for the convenience of description and do not mean that the device described therein must be manufactured or operated in a specific direction, and therefore should not be understood as limiting the present invention.

It is understood that although the terms "first", "second", "third", etc. may be used herein to describe various components, regions, layers and/or parts, these components, regions, layers and/or parts should not be limited by these terms, and these terms are only used to distinguish different components, regions, layers and/or parts. Therefore, the first component, region, layer and/or part discussed below may be referred to as a second component, region, layer and/or part without departing from some embodiments of the present invention.

As mentioned above, during the operation, the puncture needle tool needs to be clamped and replaced multiple times according to the wear of the puncture needle tool. However, the existing puncture needle clamping device cannot achieve functions such as fast clamping and fast replacement during the operation due to its complex structure and low clamping efficiency.

In order to overcome the above-mentioned defects of the prior art, the present invention provides a puncture needle clamping device and a puncture mechanism, which can drive the puncture needle clamp to extend and retract axially by setting a cam and cooperating with multiple cam rollers to clamp or release the puncture needle, and is used for quickly clamping and replacing the puncture needle, so that the operation is convenient and fast, and the clamping is stable and reliable.

In some non-limiting embodiments, the puncture needle clamping device provided in the first aspect of the present invention can be configured in the puncture mechanism provided in the second aspect of the present invention. Specifically, the puncture mechanism provided in the second aspect of the present invention includes a puncture needle and a puncture needle clamping device.

Please refer to Figures 1 to 3 for details. Figure 1 shows a schematic diagram of the structure of a puncture needle clamping device provided according to some embodiments of the present invention. Figure 2 shows a schematic diagram of the internal structure of a puncture needle clamping device provided according to some embodiments of the present invention. Figure 3 shows a schematic diagram of the cross-section of a puncture needle clamping device provided according to some embodiments of the present invention.

In the embodiments shown in FIGS. 1 to 3 , the puncture needle clamping device provided by the first aspect of the present invention includes a clamping knob 11, a cam 12, a lifter 13, a puncture needle chuck 14 and a hollow fastening shaft core 15. Here, the clamping knob 11 is used to drive the cam 12 to rotate. The cam 12 is provided with a support ring, and multiple support points along the circumference of the support ring have different heights along the axial direction of the support ring. The first end of the lifter 13 is provided with multiple cam rollers 131, and the second end thereof is fixedly connected to the first end of the puncture needle chuck 14. The multiple cam rollers 131 are respectively connected to the support ring, and move between the support points as the cam 13 rotates, so as to drive the puncture needle chuck 14 to extend and retract axially according to the height of each support point. The second end of the puncture needle chuck 14 is provided with a radial elastic structure 141, which is used to clamp the puncture needle 20 in a tightened state and release the puncture needle 20 in a loose state. The hollow fastening shaft core 15 surrounds the periphery of the puncture needle clamp 14 and is used to fasten the retracted puncture needle clamp 14 via the second end of the fastening shaft core 15 and to loosen the extended puncture needle clamp 14 .

In addition, in some embodiments, two cam rollers 131 are symmetrically provided at the first end of the lifter 13, which are used to connect to the support rings respectively and move between the support points as the cam 13 rotates, so as to drive the puncture needle clamp 14 to extend and retract axially according to the height of each support point.

Specifically, the clamping knob 11 drives the cam 12 to rotate in an off-axis manner. Here, a first gear 111 is provided at the first end of the clamping knob 11, and a second gear 112 is provided at the corresponding first end of the cam 12. The first gear 111 meshes with the second gear 112 to drive the cam 12 to rotate in an off-axis manner via the second gear 112.

Furthermore, the first gear 111 has a smaller first number of teeth, while the second gear 112 has a larger second number of teeth. The first gear 111 performs a decelerated off-axis transmission to the second gear 112 based on a corresponding transmission ratio (e.g., 3:4), so as to drive the puncture needle clamp 14 to perform a quantitative axial movement through the decelerated off-axis rotation of the cam 12. Here, the cam 12 needs to rotate 120° from its lowest point to its highest point, and the 90° rotation of the first gear can correspond to the entire axial process of the cam 12, which can improve the operating feel and convenience of the clamping knob 11.

Please further refer to Figures 4 to 7. Figure 4 shows a schematic diagram of the structural assembly of a puncture needle clamping device according to some embodiments of the present invention. Figure 5 shows a schematic diagram of the structural assembly of a clamping knob and a first gear according to some embodiments of the present invention. Figure 6 shows a schematic diagram of the structure of a first gear according to some embodiments of the present invention. Figure 7 shows a schematic diagram of the structure of a cam shaft according to some embodiments of the present invention.

As shown in Fig. 4 to Fig. 7, the inner ring of the first gear 111 is provided with a first keyway 1111, and the first end of the clamping knob 11 is provided with a second keyway. During the assembly of the puncture needle clamping device, the first end of the clamping knob 11 is circumferentially fixedly connected to the first gear 111 via the first positioning key located in the first keyway 1111 and the second keyway.

In addition, in the embodiment shown in FIG. 5 , a deep groove ball bearing 115 and a corresponding sleeve 116 are optionally provided between the first gear 111 and the clamping knob 11 to protect the first gear 111 and support the first gear 111 to rotate therein.

Similarly, the second gear 112 is fixedly connected to the cam 12 via the cam shaft 16. The inner ring of the second gear 112 is provided with a third keyway 1121, and the first end of the cam shaft 16 is provided with a fourth keyway 161. During the assembly of the puncture needle clamping device, the second gear 112 is circumferentially fixedly connected to the first end of the cam shaft 16 via the second positioning key located in the third keyway 1121 and the fourth keyway 161.

In addition, in the embodiment shown in Figure 7, the second end of the cam shaft 16 is provided with a plurality of circumferential limit grooves 162, and the outer side of the cam 12 is provided with a plurality of circumferential limit protrusions 121. The second end of the cam shaft 16 is circumferentially fixedly connected to the cam 12 via the circumferential limit protrusions 121 located in each circumferential limit groove 162.

In addition, the outer side of the cam shaft 16 may be optionally provided with a retaining ring groove 163 extending around the circumference thereof, and the axial displacement of the second gear 112 is limited by a retaining ring 164 installed in the retaining ring groove.

Please continue to refer to Figure 3. The lifter 13 is connected to the puncture needle chuck 14 via a rotating shaft core 131. A protrusion is provided in the middle of the rotating shaft core 131. The first end of the protrusion is non-fixedly connected to the second end of the lifter 13, and drives the puncture needle chuck 14 to move axially to extend under its axial push. The second end of the protrusion is connected to the first end of the fastening shaft core 15 via an elastic member 141, which is used to drive the puncture needle chuck 14 to synchronously retract the axial movement after the lifter 13 retracts. Here, the second gear 112, the cam shaft 16, the cam 12 and the lifter 13 are all annular structures. The second end of the rotating shaft core 131 extends into the hollow part of the fastening shaft core 15 to be fixedly connected to the first end of the puncture needle chuck 14, and its first end passes through the lifter 13, the cam 12, the cam shaft 16 and the second gear 112 in sequence to connect the rotating mechanism, which is used to drive the puncture needle chuck 14 and the puncture needle 20 clamped therein to rotate under the drive of the rotating mechanism. Here, the rotating mechanism may preferably be a reciprocating rotating mechanism, and the rotating shaft core 131 is driven by the rotating mechanism to drive the puncture needle clamp 14 and the puncture needle 20 clamped therein to perform reciprocating rotation.

In this way, the puncture needle 20 reciprocates to extract the hair follicle unit, which can avoid damaging the hair shaft when the needle punctures the hair follicle unit, thereby achieving hair follicle unit extraction without cutting the hair short, thereby meeting the user's needs for hair removal without shaving.

Furthermore, in some embodiments, a sliding bearing 117 and a planar thrust needle roller bearing 118 are optionally provided between the second gear 112 and the cam shaft 16 to protect the second gear 112 and support the second gear 112 to rotate therein.

In addition, in the embodiments shown in FIGS. 1 to 3 , the puncture needle clamping device provided in the first aspect of the present invention may further optionally include a spindle housing 171, a protective device 172, a front housing 173 and a rear housing 174. Here, the spindle housing 171 at least surrounds the outer side of the lifter 13 and the fastening shaft core 15, and is connected to the fastening shaft core 15 via a plurality of bearings 151 to 152 to protect the lifter 13 and the fastening shaft core 15, and supports the fastening shaft core 15 to rotate therein. The protective device 172 is provided on the spindle housing 171 to limit the ejection of the spindle housing 171. The front housing 173 and the rear housing 174 are used to surround and protect the first gear 111, the second gear 112, the cam shaft 16 and the cam 12.

Please refer to Figures 8 and 9. Figure 8 shows a schematic diagram of the structure of a cam provided according to some embodiments of the present invention. Figure 9 shows a schematic diagram of the plane expansion of a support ring of a cam provided according to some embodiments of the present invention.

As shown in Figures 8 and 9, the support ring includes a first support area corresponding to the tightened state, a second support area corresponding to the relaxed state, and a third support area between the first support area and the second support area. The first support area includes a plurality of first support points that are less than the critical tightening height, and the height of each first support point decreases first and then increases, so that the cam roller 131 in the tightened state automatically stabilizes at the first support point 122 with the lowest height. Here, the critical tightening height is the height at which the radial tightening force is equal to the first target force (for example: ≥25N) for clamping the puncture needle chuck 14.

Similarly, the second support area includes a plurality of second support points greater than the critical height of relaxation, and the height of each second support point decreases first and then increases, so that the cam roller 131 in the relaxed state automatically stabilizes at the second support point 123 with the lowest height. Here, the critical height of relaxation is the height at which the radial tightening force is equal to the second target force (for example, 0N) for loosening the puncture needle clamp 14.

In addition, the third support area includes multiple third support points between the tightening critical height and the loosening critical height, and the height of each third support point increases with a first slope (for example, linearly increasing) from the first support area to the second support area to provide a gradually enhanced rotation feel.

Furthermore, multiple critical third support points in the third support area adjacent to the first support area and/or the second support area have a height that suddenly increases with a second slope greater than the first slope, so as to provide a sudden increase in rotational feel prompt when the cam roller 131 passes through multiple critical third support points, and/or a "click" sound prompt when the cam roller 131 hits the critical third support point.

Please refer to FIG. 10 , which shows a schematic structural diagram of a puncture needle clamping device according to some embodiments of the present invention.

In addition, in the embodiment shown in FIG10 , the puncture needle clamping device provided by the first aspect of the present invention may also optionally include a photoelectric switch 113 and a U-shaped photoelectric sensor 114. The photoelectric switch 113 is arranged on the clamping knob 11 and rotates with the rotation of the clamping knob 11. Here, the photoelectric switch 113 is provided with an arc-shaped fan blade, which is used to block the sensing area (e.g., the middle part) of the U-shaped photoelectric sensor 114 in a tightened state to control the U-shaped photoelectric sensor 114 to be in a closed state, and to expose the sensing area of the U-shaped photoelectric sensor 114 in a loose state to control the U-shaped photoelectric sensor 114 to be in an open state. The U-shaped photoelectric sensor 114 is used to receive the light signal of the sensing area in the open state, and convert the light signal into an electrical signal output to turn on the warning light and/or buzzer to prompt reset.

In summary, the above-mentioned puncture needle clamping device and puncture mechanism provided by the present invention can drive the puncture needle clamp to extend and retract axially by setting a cam and cooperating with multiple cam rollers to clamp or release the puncture needle, and is used for quickly clamping and replacing the puncture needle, thereby making the operation convenient and fast, and the clamping stable and reliable.

Although the above methods are illustrated and described as a series of actions for simplicity of explanation, it should be understood and appreciated that these methods are not limited by the order of the actions, because according to one or more embodiments, some actions may occur in a different order and/or concurrently with other actions from those illustrated and described herein or not illustrated and described herein but understandable to those skilled in the art.

The previous description of the disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the spirit or scope of the disclosure. Thus, the disclosure is not intended to be limited to the examples and designs described herein, but should be granted the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A puncture needle clamping device, characterized in that it comprises: A clamping knob, used to drive the cam to rotate; The cam is provided with a support ring, wherein a plurality of support points along the circumference of the support ring have different heights along the axial direction of the support ring; A lifter, a first end of which is provided with a plurality of cam rollers, and a second end of which is fixedly connected to the first end of the puncture needle chuck, wherein the plurality of cam rollers are respectively connected to the support rings and move between the support points as the cam rotates, so as to drive the puncture needle chuck to extend and retract axially according to the height of each support point; The puncture needle clamp has a radial elastic structure at its second end, which is used to clamp the puncture needle in a tightened state and release the puncture needle in a loose state; and The hollow fastening shaft core surrounds the periphery of the puncture needle clamp and is used for fastening the retracted puncture needle clamp and loosening the extended puncture needle clamp. 2. The puncture needle clamping device as described in claim 1 is characterized in that the clamping knob drives the cam to rotate eccentrically, wherein a first gear is provided at the first end of the clamping knob, and a second gear is provided at the first end corresponding to the cam, and the first gear meshes with the second gear to drive the cam to rotate eccentrically via the second gear. 3. The puncture needle clamping device as described in claim 2 is characterized in that the first gear has a smaller first number of teeth, and the second gear has a larger second number of teeth, and the first gear performs a decelerated off-axis transmission to the second gear based on a corresponding transmission ratio, so as to drive the puncture needle chuck to perform a quantitative axial movement through the decelerated off-axis rotation of the cam. 4. The puncture needle clamping device according to claim 2, characterized in that the inner ring of the first gear is provided with a first keyway, the first end of the clamping knob is provided with a second keyway, and the first end of the clamping knob is circumferentially fixedly connected to the first gear via a first positioning key located in the first keyway and the second keyway, The second gear is fixedly connected to the cam via a cam shaft, wherein a third keyway is provided on an inner ring of the second gear, a fourth keyway is provided on the first end of the cam shaft, the second gear is circumferentially fixedly connected to the first end of the cam shaft via a second positioning key located in the third keyway and the fourth keyway, a plurality of circumferential limiting grooves are provided on the second end of the cam shaft, a plurality of circumferential limiting protrusions are provided on the outer side of the cam, and the second end of the cam shaft is circumferentially fixedly connected to the cam via a circumferential limiting protrusion located in each of the circumferential limiting grooves. The outer side of the cam shaft is provided with a retaining ring groove extending around the circumference thereof, and the axial displacement of the second gear is limited by the retaining ring installed in the retaining ring groove. 5. The puncture needle clamping device according to claim 4, characterized in that the lifter is connected to the puncture needle clamp via a rotating shaft core, wherein: A raised portion is provided at the middle of the rotating shaft core, and the first end of the raised portion is non-fixedly connected to the second end of the lifter, and drives the puncture needle chuck to extend axially under the axial push of the raised portion, and the second end of the raised portion is connected to the first end of the fastening shaft core via an elastic member, and is used to drive the puncture needle chuck to synchronously retract axially after the lifter retracts. The second gear, the cam shaft, the cam and the lifter are all annular structures. The second end of the rotating shaft core extends into the hollow portion of the fastening shaft core to fix the first end of the puncture needle clamp, and its first end passes through the lifter, the cam, the cam shaft and the second gear in sequence to connect the rotating mechanism, which is used to drive the puncture needle clamp and the puncture needle clamped therein to rotate under the drive of the rotating mechanism. 6. The puncture needle clamping device according to claim 5, characterized in that it also includes: A spindle housing at least surrounds the outer sides of the lifter and the fastening shaft core and is connected to the fastening shaft core via a plurality of bearings to protect the lifter and the fastening shaft core and support the fastening shaft core to rotate therein; and A protective device is arranged on the spindle housing and is used to limit the ejection of the spindle housing. 7. The puncture needle clamping device according to claim 1, characterized in that the support ring includes a first support area corresponding to the tightened state, a second support area corresponding to the relaxed state, and a third support area between the first support area and the second support area, wherein: The first support area includes a plurality of first support points which are smaller than the critical height of tightening, and the height of each of the first support points decreases first and then increases, so that the cam roller in the tightened state automatically stabilizes at the first support point with the lowest height. The second support area includes a plurality of second support points greater than the critical height of relaxation, and the height of each second support point decreases first and then increases, so that the cam roller in the relaxed state automatically stabilizes at the second support point with the lowest height. The third support area includes a plurality of third support points between the tightening critical height and the loosening critical height, and the height of each third support point increases from the first support area to the second support area to provide a gradually enhanced rotation feel. 8. The puncture needle clamping device as described in claim 7 is characterized in that a plurality of critical third support points in the third support area adjacent to the first support area and/or the second support area have a sudden increase in height, so as to provide a sudden increase in rotational feel prompt when the cam roller passes through the plurality of critical third support points, and/or a sound prompt when the cam roller hits the critical third support point. 9. The puncture needle clamping device according to claim 1, further comprising: a photoelectric switch, which is arranged on the clamping knob and rotates with the rotation of the clamping knob, wherein the photoelectric switch is provided with an arc-shaped fan blade, which is used to shield the sensing area of the U-shaped photoelectric sensor in the tightened state to control the U-shaped photoelectric sensor to be in the closed state, and to expose the sensing area of the U-shaped photoelectric sensor in the loose state to control the U-shaped photoelectric sensor to be in the open state; and The U-shaped photoelectric sensor is used to receive the light signal of the sensing area in the turned-on state, and convert the light signal into an electrical signal for output, so as to turn on the warning light for prompting reset. 10. A puncture mechanism, characterized by comprising: A puncture needle; and The puncture needle clamping device according to any one of claims 1 to 9.