A flexible contact type hair follicle extractor

Abstract

The application discloses a flexible contact type hair follicle extractor and belongs to the technical field of medical devices. In order to solve the technical problem that the existing hair follicle extractor is easy to damage hair follicles due to rigid impact, the application provides a flexible contact type hair follicle extractor, which comprises a shell, a rotating assembly rotatably installed in the shell, the rotating assembly being provided with a mounting end for mounting an extraction needle and a transmission end, and a buffer assembly. The core is that the buffer assembly enables the mounting end of the rotating assembly to produce a resilient axial displacement relative to the shell when subjected to an axial force, so as to buffer the impact force generated when the hair follicle is extracted. The application converts rigid impact into flexible contact, reduces the hair follicle breakage rate, improves the extraction integrity rate and postoperative survival rate of the hair follicle, provides clear force feedback for an operator, and reduces the operation difficulty.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a flexible contact hair follicle extractor. Background Technology

[0002] In hair transplant surgery, a follicle extractor is typically used to obtain hair follicle units. Existing follicle extractors generally consist of a housing, a motor-driven rotating component, and a head for mounting extraction needles. During operation, the motor drives the extraction needles to rotate at high speed to drill for hair follicles in the scalp.

[0003] However, in existing technologies, the rotating components and drive motors are generally connected by a rigid axial connection. One drawback of this design is that when the high-speed rotating extraction needle tip contacts the scalp, a rigid, high-peak impact force is generated. The fragile hair follicle tissue cannot deform in time under this impact and is easily severed, directly leading to a reduced follicle extraction integrity rate and postoperative survival rate. Furthermore, this rigid impact places extremely high demands on the operator's experience and dexterity, lacking sufficient margin for error; even slight carelessness can damage the hair follicle or cause extraction failure. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a hair follicle extractor that can avoid rigid impact during hair follicle extraction, thereby reducing the hair follicle breakage rate and improving the hair follicle extraction integrity rate and survival rate.

[0005] To address the aforementioned technical problems, the present invention provides a flexible contact hair follicle extractor, comprising: a housing; a rotating assembly rotatably mounted within the housing, the rotating assembly having a mounting end for mounting an extraction needle and a transmission end; and a buffer assembly, the buffer assembly enabling the mounting end of the rotating assembly to generate a spring-like axial displacement relative to the housing when subjected to an axial force, thereby buffering the impact force generated during hair follicle extraction.

[0006] Optionally, the distance of the springback axial displacement is 0.2-0.4 mm.

[0007] Optionally, the rotating assembly includes a rotating shaft, and the buffer assembly includes at least one first bearing and a first elastic element that are axially slidably mounted within the housing; the rotating shaft is mounted on the inner ring of the first bearing, the housing includes a bearing chamber for accommodating the first bearing, a limiting portion is provided on the inner wall of the bearing chamber, and the first elastic element is disposed between the limiting portion and the outer ring of the first bearing.

[0008] Optionally, the first elastic element is a wave washer.

[0009] Optionally, the rotating assembly includes a main shaft section and a transmission section. The mounting end of the rotating assembly is disposed on the main shaft section, and the transmission end of the rotating assembly is disposed on the transmission section. The main shaft section and the transmission section are connected by a torque transmission structure that allows axial sliding. The buffer assembly includes a second elastic element disposed between the main shaft section and the transmission section, so that the main shaft section can generate axial displacement relative to the transmission section.

[0010] Optionally, the second elastic element is a spring.

[0011] Optionally, the buffer assembly further includes at least one first bearing and a first elastic element that are axially slidably mounted within the housing; the spindle section is mounted on the inner ring of the first bearing; the housing includes a bearing chamber for accommodating the first bearing; a limiting portion is provided on the inner wall of the bearing chamber; and the first elastic element is disposed between the limiting portion and the outer ring of the first bearing.

[0012] Optionally, the first elastic element is a wave washer, and the second elastic element in the buffer assembly is a spring.

[0013] Optionally, the hair follicle extractor further includes a second bearing, and the drive end of the rotating assembly is mounted in the housing via the second bearing.

[0014] Optionally, the mounting end of the rotating assembly includes an elastic gripper, and the hair follicle extractor further includes a chuck nut screwed onto the elastic gripper.

[0015] Optionally, the hair follicle extractor further includes a variable diameter clamp tube, which is inserted into the elastic gripper, and the variable diameter clamp tube has a through hole for inserting an extraction needle.

[0016] Optionally, the housing includes a connecting sleeve, a first bushing, and a second bushing; the first bushing is screwed to one end of the connecting sleeve, and the second bushing is screwed to the other end of the connecting sleeve.

[0017] Optionally, the hair follicle extractor further includes a handle body, a drive motor installed in the handle body, and a battery, wherein the output shaft of the drive motor is connected to the transmission end of the rotating assembly.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] (i) Transforming rigid impact into flexible contact significantly reduces hair follicle damage rate.

[0020] In existing hair follicle extractors, the rotating component and drive motor are generally connected by a rigid axial connection. When the high-speed rotating extraction needle tip contacts the scalp, a rigid peak impact force is generated, easily severing the fragile hair follicle tissue. This invention, by incorporating a buffer component, allows the mounting end of the rotating component to generate a resilient axial displacement relative to the housing when subjected to axial force, transforming the rigid impact of the extraction needle contacting the scalp into a flexible contact. The impact energy is absorbed by the buffer component and temporarily stored as elastic potential energy, effectively reducing the peak shear force acting on the hair follicle. This solves the technical problem of hair follicle damage due to excessive impact force, significantly improving the hair follicle extraction integrity rate and postoperative survival rate.

[0021] (ii) Optimize the buffer travel range to balance hair follicle protection and operational precision.

[0022] This invention optimizes the rebound axial displacement distance to 0.2-0.4 mm. Displacement less than 0.2 mm provides insufficient cushioning and still results in a high impact sensation; while displacement greater than 0.4 mm may lead to inaccurate needle tip positioning, producing a "floating" sensation and affecting the doctor's tactile feedback. By limiting the displacement distance within this range, this invention effectively protects hair follicles without sacrificing operational precision, achieving the optimal balance between follicle protection and operational accuracy.

[0023] (iii) Provide clear force feedback to the operator and reduce the difficulty of the operation.

[0024] This invention provides clear and progressive tactile feedback to the operator through the elastic deformation of the buffer component. The operator can perceive the contact state and insertion depth of the extraction needle with the scalp by touch, without relying entirely on visual judgment. This reduces the dependence of the surgery on the operator's experience, shortens the learning curve, and makes the surgical process more controllable.

[0025] (iv) The dual buffer structure enables progressive force feedback, enhancing the protection effect of hair follicles.

[0026] This invention also provides a preferred embodiment of a dual-buffer structure, which achieves a two-stage buffering effect by combining an internal elastic element (such as a spring) with an external elastic element (such as a wave-shaped washer). Upon initial contact, the softer internal elastic element absorbs energy, providing a gentle initial contact feel; as the pressure increases further, the external wave-shaped washer intervenes to provide firmer support. This design provides doctors with clear two-stage force feedback, maximizing the protection of hair follicles while simulating the force control of an experienced doctor's manual operation, achieving better hair follicle protection and ergonomics.

[0027] (v) The structure is compact, making it easy to assemble and maintain.

[0028] This invention integrates the buffer assembly between the housing and the rotating assembly, resulting in a compact overall structure without adding extra external volume. The housing adopts a modular, split design (connecting sleeve, first bushing, second bushing), which facilitates the installation, positioning, and cleaning and maintenance of internal precision components, thereby improving the maintainability and service life of the equipment.

[0029] (vi) Strong compatibility and wide range of applications

[0030] This invention, by incorporating a replaceable variable-diameter clamp tube within the elastic gripper, allows the device to accommodate extraction needles of different specifications. Users do not need to replace the entire rotating assembly; simply replacing the variable-diameter clamp tube ensures compatibility with extraction needles of varying diameters, enhancing the device's versatility and economy, and reducing operating costs.

[0031] In summary, this invention effectively solves the technical problem that existing hair follicle extractors are prone to damaging hair follicles due to rigid impact. It has achieved significant technical progress in protecting the integrity of hair follicles, improving the success rate of surgery, improving the user experience, and reducing the cost of use. It has good clinical application prospects and promotional value. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic cross-sectional view of a hair follicle extractor according to Embodiment 1 of the present invention.

[0034] Figure 2 This is a schematic cross-sectional view of a hair follicle extractor according to Embodiment 2 of the present invention.

[0035] Figure 3 This is a schematic cross-sectional view of a hair follicle extractor according to Embodiment 3 of the present invention.

[0036] Figure 4 This is a schematic diagram of the overall structure of a hair follicle extractor according to an embodiment of the present invention.

[0037] Explanation of reference numerals in the attached drawings: housing 201, connecting sleeve 202, first bushing 203, second bushing 204, rotating shaft 205, first bearing 206, first elastic element 207, second bearing 208, elastic gripper 209, chuck nut 210, variable diameter clamping tube 211, extraction needle 212, main shaft section 301, transmission section 302, second elastic element 303, handle body 101, drive motor 102, battery 103, extraction head 104. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. The described embodiments should not be considered as limitations on this application. All other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application. Unless otherwise defined, all technical and scientific terms used in the embodiments of this application have the same meaning as commonly understood by those skilled in the art. The terminology used in the embodiments of this application is for the purpose of describing the embodiments of this application only and is not intended to limit this application. Before further detailed description of the embodiments of this application, the nouns and terms involved in the embodiments of this application are explained, and the nouns and terms involved in the embodiments of this application are subject to the following interpretations.

[0039] (1) Rotating assembly: refers to a component rotatably mounted within the housing, having a mounting end for mounting the extraction needle and a transmission end for receiving power. In this invention, it can be an integral rotating shaft or a split structure composed of a main shaft section and a transmission section.

[0040] (2) Buffer assembly: refers to a mechanical structure or system that enables the mounting end of the rotating assembly to generate a spring-like axial displacement relative to the housing when subjected to axial force. Its core function is to absorb and release impact energy to achieve flexible contact, rather than being limited to a specific location or component.

[0041] (3) Bearing chamber: refers to the internal cavity or groove structure specially provided on the housing to accommodate one or more bearings, and its inner wall can be used to set up a limiting part or other structure that cooperates with the bearing.

[0042] (4) Torque transmission structure: refers to a connection structure used to transmit rotational torque between the main shaft section and the transmission section, while allowing relative axial sliding between the two, such as spline connection, claw connection or non-circular cross section fit connection.

[0043] This application aims to address the technical problem of existing hair follicle extractors, which use a rigid axial connection, resulting in a huge impact force on the extraction needle upon contact with the scalp, thus cutting off the hair follicle and reducing the success rate of extraction. To this end, this application provides a flexible contact hair follicle extractor with a buffering mechanism. Please refer to... Figures 1 to 3 The core of this technical solution lies in the introduction of a buffer component, which enables the rotating component to produce a spring-back displacement when subjected to axial force.

[0044] This application provides a flexible contact hair follicle extractor, whose basic components include a housing 201, a rotating assembly rotatably mounted within the housing 201, and a buffer assembly. The rotating assembly has a mounting end, such as an elastic gripper 209, for mounting an extraction needle 212, and a transmission end for receiving power. This design aims to modify the mechanical properties of the extraction needle 212 when it contacts the scalp.

[0045] The key to this solution lies in the inclusion of the buffer component. Functionally, this buffer component allows the mounting end of the rotating component to exhibit a resilient axial displacement relative to the housing 201 when subjected to axial force. The fundamental purpose of this design is to buffer the impact force generated when the tip of the extraction needle 212 contacts the skin during hair follicle extraction. In existing technologies, this impact is rigid, with a large peak force, which is the primary cause of hair follicle severance. By introducing the buffer component, this rigid impact is transformed into flexible contact. The impact energy is absorbed by the buffer component and temporarily stored as elastic potential energy, thereby reducing the peak shear force acting on the hair follicle. This solves the technical problem of hair follicle damage due to excessive impact force and improves the integrity and survival rate of hair follicle extraction.

[0046] Furthermore, in a preferred embodiment, to achieve a balance between providing sufficient cushioning travel to absorb impact energy and ensuring operator precision, the distance of the rebounding axial displacement is optimized to 0.2-0.4 mm. Displacement less than 0.2 mm results in insignificant cushioning and still a high degree of impact; while displacement greater than 0.4 mm may lead to inaccurate needle tip positioning during operation, producing a "floating" sensation and affecting the doctor's feel and operational precision. Therefore, by limiting the displacement distance within this range, effective protection of the hair follicles is achieved without sacrificing operational precision.

[0047] In one specific implementation, such as combining Figure 1As shown, a specific structural implementation of the above functional definition is provided. In this scheme, the rotating component is specifically embodied as an integral rotating shaft 205. The buffer component is formed by at least one first bearing 206 and a first elastic element 207. To achieve the buffering function, the first bearing 206 is designed to be axially slidably mounted within the housing 201. Specifically, the rotating shaft 205 is mounted on the inner ring of the first bearing 206 and rotates with it. A bearing chamber for accommodating the first bearing 206 is formed inside the housing 201, and a limiting part for providing a reaction force reference is specially provided on the inner wall of the bearing chamber. The first elastic element 207 is disposed between the limiting part and the outer ring of the first bearing 206. Through this "overall floating" structural layout, when the rotating shaft 205 is subjected to axial force, the entire rotating shaft 205, together with the first bearing 206, will compress the first elastic element 207 backward, thereby achieving buffer displacement.

[0048] In another preferred embodiment, to achieve a compact structure and reliable elastic recovery, the first elastic element 207 can specifically be a corrugated washer. A corrugated washer is a gasket with a predetermined curved shape, possessing good elasticity and a short stroke, suitable for providing precise and responsive cushioning force in this device. Its annular structure can uniformly apply the elastic force to the outer ring of the first bearing 206, helping to ensure smooth movement and avoiding uneven loading. By using a corrugated washer as the first elastic element, not only is the structure simple and space-saving, but it also provides a stable and reliable elastic recovery force, helping to ensure the long-term effectiveness of the cushioning function.

[0049] In another alternative implementation, such as combining Figure 2 As shown, another parallel technical solution for achieving the buffering function is provided. In this solution, the rotating component is designed as a split structure, including a main shaft section 301 and a transmission section 302. The mounting end of the rotating component is located on the main shaft section 301, while the transmission end is located on the transmission section 302. The two are connected by a torque transmission structure (e.g., spline or chuck) that allows axial sliding, ensuring that the main shaft section 301 can move axially relative to the transmission section 302 while transmitting rotational motion. The buffering component is correspondingly specified as a second elastic element 303, which is disposed between the main shaft section 301 and the transmission section 302. This "split floating" design places the buffering function inside the rotating component, ensuring that only the main shaft section 301, which contacts the hair follicle at the front end, undergoes displacement, while the transmission section 302 and the motor system at the rear end remain stable, thus improving dynamic stability under high-speed rotation.

[0050] Furthermore, in one specific implementation of the aforementioned split-floating scheme, the second elastic element 303 can be a spring. As a standard and mature elastic element, the spring has advantages such as flexible design, wide stroke range, and good linearity. Positioning it between the main shaft section 301 and the transmission section 302 allows for easy adjustment of the cushioning's "hardness" by replacing springs with different stiffnesses, thus adapting to different skin characteristics or the needs of doctors' operating habits. By using a spring as the second elastic element, the cushioning characteristics become adjustable, enhancing the adaptability of the device.

[0051] In another embodiment, such as in combination Figure 3 As shown, the two aforementioned buffer structures are combined to form a dual buffer system. Based on the previously described split floating structure (i.e., the main shaft section 301, the transmission section 302, and the second elastic element 303 between them), this design further incorporates an external buffer structure consisting of an axially sliding first bearing and a first elastic element for supporting the first bearing 206 of the main shaft section 301. Specifically, the first bearing 206 is also axially slidingly mounted in the bearing chamber within the housing, and a first elastic element 207 is provided between the limiting part of the bearing chamber and the outer ring of the first bearing 206. This design allows the device to possess both internal and external buffering mechanisms, enabling a more complex and optimized mechanical response. For example, it can be designed as a two-stage buffer: during initial contact, a softer internal spring absorbs energy; as the pressure increases further, the external wave-shaped washer intervenes, providing multi-stage force feedback to the doctor and protecting the hair follicles within a wider force range.

[0052] Furthermore, in a preferred configuration of the aforementioned dual-buffering scheme, the first elastic element 207 is a wave washer, while the second elastic element 303 in the buffer assembly is a spring. This combination fully utilizes the respective advantages of the two elastic elements: the spring provides a larger buffering stroke and a softer initial response to absorb most low-frequency impacts; while the wave washer provides stiffer support and rapid rebound to handle instantaneous high-peak impacts and provide a clear bottoming sensation. Through this combination, a composite buffering effect is achieved, simulating the force control of an experienced doctor's manual operation, resulting in better hair follicle protection and ergonomics.

[0053] Based on any of the above embodiments, a second bearing can be added to further improve the operating accuracy and stability of the rotating assembly. For example... Figure 1As shown, the transmission end of the rotating component (e.g., the rear end of the rotating shaft 205 or the rear end of the transmission section 302) can be mounted in the housing 201 via the second bearing 208. By providing bearing support at both ends of the rotating component, a stable double-support structure is formed, which can effectively resist radial forces and ensure that the rotating component has high concentricity when rotating at high speed. This avoids interference to the extraction process caused by vibration or eccentricity, thereby indirectly improving the accuracy and success rate of extraction.

[0054] Based on any of the above embodiments, in order to achieve rapid and reliable clamping of the extraction needle 212, the mounting end of the rotating assembly can be designed as a precision clamping structure. Specifically, as in Figure 1 As shown, the mounting end includes a resilient gripper 209 with multiple radially retractable claw flaps. The hair follicle extractor also includes a chuck nut 210, which is threaded onto the outside of the resilient gripper 209. When the chuck nut 210 is tightened, its inner conical surface forces the resilient gripper 209 inward, thus firmly clamping the extraction needle. This structure not only provides strong clamping force and high concentricity but also facilitates operation, allowing doctors to quickly change extraction needles of different sizes or worn needles during surgery.

[0055] Furthermore, to enhance compatibility with extraction needles of different diameters, a variable-diameter clamping tube 211 can be added to the above-mentioned clamping structure. For example, in... Figure 1 As shown, the variable-diameter clamp tube 211 can be inserted into the inner hole of the elastic gripper 209. The variable-diameter clamp tube 211 itself has a precise through-hole for inserting the extraction needle 212. By equipping a series of variable-diameter clamp tubes with through-holes of different inner diameters, the user can adapt the device to extraction needles 212 of different sizes without replacing the entire rotating assembly, simply by changing the variable-diameter clamp tube 211. This enhances the versatility and economy of the device and reduces operating costs.

[0056] Based on any of the above embodiments, for ease of processing, assembly, and maintenance, the housing 201 can adopt a modular, split design. Specifically, as in... Figure 1 As shown, the housing 201 may include a connecting sleeve 202, a first bushing 203, and a second bushing 204. The first bushing 203 is threadedly connected to one end of the connecting sleeve 202, and the second bushing 204 is threadedly connected to the other end of the connecting sleeve 202. This three-section structure simplifies the installation and positioning of internal components (such as the first bearing 206, the second bearing 208, etc.), and also facilitates subsequent cleaning, maintenance, and parts replacement, thus improving the maintainability of the equipment.

[0057] Finally, to create a fully functional and easy-to-use handheld medical device, the extraction head of any of the above embodiments can be integrated with a power system. For example, in Figure 4 As shown in the illustration, this application embodiment also provides a complete device solution, which includes a handle body 101, a drive motor 102 installed within the handle body 101, and a battery 103. The output shaft of the drive motor 102 is connected to the transmission end of the rotating assembly, providing power for the rotation of the extraction needle 212. The battery 103 provides electrical energy to the drive motor 102, enabling the entire device to be operated wirelessly, improving the flexibility and convenience during surgery. The handle body 101 itself is ergonomically designed for easy gripping, and can be equipped with control elements such as switches. By integrating the buffer extraction head 104 with the handle body 101, a complete electric hair follicle extractor device is formed.

[0058] The specific embodiments of the present invention will now be described in more detail with reference to the accompanying drawings.

[0059] Please see Figure 1 The figure illustrates a first specific embodiment of a hair follicle extractor according to the present invention, which achieves a "floating" buffering method. The hair follicle extractor includes a housing 201 serving as the main support, and a rotating assembly rotatably mounted inside the housing 201. In this embodiment, the rotating assembly is an integral rotating shaft 205. The front end of the rotating shaft 205, i.e., the mounting end, extends out of the housing 201 for mounting the extraction needle 212; its rear end serves as the transmission end for connecting to a power source.

[0060] To achieve the buffering function, this embodiment provides a buffer assembly consisting of a first bearing 206 and a first elastic element 207. Specifically, the rotating shaft 205 is fixed by the inner ring of the first bearing 206 and rotates accordingly. The outer ring of the first bearing 206 is installed in a special structure—a bearing chamber—within the housing 201. The dimensions of this bearing chamber are designed to allow the first bearing 206 to slide axially within a small range. An annular limiting portion is formed on the rear wall of the bearing chamber, providing a fixed support surface for the first elastic element 207. In this embodiment, the first elastic element 207 is preferably a wave-shaped washer, placed between the limiting portion and the rear end face of the outer ring of the first bearing 206. The wave-shaped washer has a certain preload in the initial state, pushing the first bearing 206 and the rotating shaft 205 to their foremost position.

[0061] When the doctor operates the extractor, the tip of the extraction needle 212 contacts the patient's scalp, encountering an axially backward resistance. This force is transmitted through the extraction needle 212 to the rotating shaft 205, and then to the first bearing 206 fixed thereto. Since the first bearing 206 is axially slidable, the entire rotating shaft 205 and the first bearing 206 act as a whole, overcoming the elastic force of the wave washer and displacing backward, compressing the wave washer. This compression process converts the impact kinetic energy into the elastic potential energy of the wave washer, effectively reducing the peak impact force and achieving flexible contact. When the extraction force decreases or the extraction needle 212 leaves the skin, the compressed wave washer rebounds, pushing the rotating shaft 205 and the first bearing 206 back to their original initial position, ready for the next extraction. Preferably, this rebounding axial displacement distance is precisely controlled within 0.2-0.4 mm to balance cushioning effect and operational accuracy.

[0062] To further improve the smoothness and concentricity of the rotation of the shaft 205, this embodiment also adds a second bearing 208 near the transmission end of the shaft 205. This second bearing 208 is fixedly installed inside the housing 201, providing a stable radial support point for the rear end of the shaft 205. Thus, the shaft 205 is supported by the first bearing 206 at the front end and the second bearing 208 at the rear end, forming a stable double-support structure. This ensures that even under high-speed rotation, the shaft 205 maintains low radial runout, thereby helping to guarantee the positioning accuracy of the extraction needle 212 tip.

[0063] Regarding the structure of the housing 201, this embodiment adopts a three-section design for easy assembly and maintenance. For example... Figure 1 As shown, the housing 201 consists of a central connecting sleeve 202, a front first bushing 203, and a rear second bushing 204. The first bushing 203 and the second bushing 204 are screwed onto both ends of the connecting sleeve 202. The bearing housing containing the first bearing 206 and the first elastic element 207 is located at the junction of the connecting sleeve 202 and the first bushing 203, while the second bearing 208 is installed at the junction of the connecting sleeve 202 and the second bushing 204. This modular design simplifies the installation, positioning, and debugging process of the internal precision components.

[0064] At the mounting end of the rotating shaft 205, a precision clamping mechanism is installed to facilitate the clamping of extraction needles 212 of different specifications. This mechanism includes elastic jaws 209 machined directly into the front end of the rotating shaft 205, a detachable variable-diameter clamping tube 211, and a locking nut 210. In use, first insert the variable-diameter clamping tube 211, which is adapted to the diameter of the extraction needle 212, into the elastic jaws 209; then insert the extraction needle 212 into the through hole of the variable-diameter clamping tube 211; and finally tighten the nut 210. The inner conical surface of the nut 210 forces the jaws of the elastic jaws 209 to contract towards the center, thereby firmly locking the extraction needle 212 through the variable-diameter clamping tube 211. This mechanism ensures clamping strength and high concentricity.

[0065] In another implementation, please refer to Figure 2 This invention provides another "split-floating" buffering solution. The main difference from the first embodiment lies in the structure of the rotating assembly. In this embodiment, the rotating assembly is divided into a front spindle section 301 and a rear transmission section 302. The front end of the spindle section 301 is also used to mount the extraction needle 212, and its rear end is opposite to the front end of the transmission section 302. The two are connected by a special torque transmission structure, such as a spline connection, which allows the spindle section 301 to slide axially relative to the transmission section 302 while reliably transmitting rotational torque.

[0066] In this embodiment, the buffer assembly is disposed inside the rotating assembly. Specifically, a second elastic element 303, preferably a helical spring, is disposed between the main shaft section 301 and the transmission section 302. For example, a receiving hole can be machined on each of the opposite end faces, and the two ends of the spring are respectively placed in these two holes. The main shaft section 301 is supported by a first bearing 206, and the transmission section 302 is supported by a second bearing 208. In this embodiment, these two bearings can be axially fixed.

[0067] Its working principle is as follows: When the extraction needle 212 is subjected to axial impact force, this force is transmitted to the main shaft section 301. The main shaft section 301 overcomes the elastic force of the second elastic element 303 between itself and the transmission section 302 and moves backward, thereby achieving buffering. At this time, the transmission section 302 and the motor connected to it remain in place. The advantage of this design is that the mass of the components involved in axial floating is smaller (only the main shaft section 301), and the inertia is also smaller, theoretically enabling a faster response speed. At the same time, decoupling the buffer structure from the main drive system helps to improve dynamic stability under high-speed rotation.

[0068] Furthermore, to achieve a superior and more refined buffering effect, this invention also provides a dual-buffering implementation that combines the advantages of the aforementioned two solutions. Please refer to [link / reference]. Figure 3 This implementation method adopts Figure 2 Based on the "split floating" structure shown (i.e., the main shaft section 301, the transmission section 302 and the internal second elastic element 303 between them, such as a spring), the first bearing 206 supporting the main shaft section 301 is also given an "overall floating" function.

[0069] Specifically, the first bearing 206 supporting the main shaft section 301 is also designed to slide axially within the bearing chamber of the housing. Furthermore, a first elastic element 207, such as a wave-shaped washer, is provided between the limiting portion of the bearing chamber and the first bearing 206. Thus, the hair follicle extractor possesses both internal and external buffering systems.

[0070] This dual-buffering system achieves a progressive cushioning effect. For example, it can be designed with a softer internal second elastic element 303 (spring) and a firmer external first elastic element 207 (wave washer). When the extraction needle 212 first contacts the skin, the smaller impact force is initially absorbed by the softer spring, providing a very gentle initial contact feel. As the pressure increases, the spindle section 301 moves backward. When its displacement reaches a certain level (e.g., the internal spring is compressed to a certain extent or the spindle section contacts the transmission section), the entire spindle section 301, along with the first bearing 206, begins to move backward as a whole, compressing the firmer wave washer. This process provides the doctor with clear two-stage force feedback: the first stage is soft, indicating contact; the second stage significantly increases resistance, indicating that the predetermined depth has been reached and pressure should be stopped. This design maximizes the protection of the hair follicle and provides the doctor with a delicate feel and room for error.

[0071] Finally, to demonstrate the final product form of this invention, please refer to [link / reference]. Figure 4 The figure shows a complete, handheld, electric hair follicle extractor. The extractor mainly consists of two parts: a front extraction head 104 and a rear handle body 101. The extraction head 104 is the front module formed by the housing 201 and its internal rotating and buffering components as described in any of the preceding embodiments, for example... Figure 1 , Figure 2 or Figure 3 The structure is shown. The handle body 101 is hollow, ergonomically designed, and easy to hold for extended periods. It houses the drive motor 102, which provides rotational power to the extraction head 104, and the battery 103, which powers the motor. The output shaft of the drive motor 102 is reliably connected to the transmission end of the rotating assembly inside the extraction head 104 via a coupling or similar means. The surface of the handle body 101 typically also includes control elements such as a power switch and a speed adjustment button. This integrated design applies the cushioning technology of this invention to a handheld device, enabling its application in clinical hair transplant surgery.

[0072] Those skilled in the art should understand that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the invention. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention. For example, the various elastic elements mentioned in the above embodiments, such as wave washers and springs, can be replaced with other elements with elastic functions, such as rubber rings and disc springs. Similarly, the torque transmission structure is not limited to splines; any structure capable of transmitting torque and allowing axial sliding falls within the scope of the present invention. These obvious modifications or substitutions should be understood by those skilled in the art to be included within the scope of this application.

Claims

1. A flexible contact hair follicle extractor, comprising: A shell; A rotating assembly is rotatably mounted within the housing, and the rotating assembly has a mounting end for mounting an extraction needle and a transmission end; The hair follicle extractor is characterized in that it further includes a buffer assembly, which enables the mounting end of the rotating assembly to generate a spring-like axial displacement relative to the housing when subjected to axial force, thereby buffering the impact force generated during hair follicle extraction.

2. The hair follicle extractor according to claim 1, characterized in that, The distance of the resilient axial displacement is 0.2-0.4 mm.

3. The hair follicle extractor according to claim 1, characterized in that, The rotating assembly includes a rotating shaft, and the buffer assembly includes at least one first bearing and a first elastic element that are axially slidably mounted within the housing; The rotating shaft is installed on the inner ring of the first bearing. The housing includes a bearing chamber for accommodating the first bearing. A limiting part is provided on the inner wall of the bearing chamber. The first elastic element is disposed between the limiting part and the outer ring of the first bearing.

4. The hair follicle extractor according to claim 3, characterized in that, The first elastic element is a wave washer.

5. The hair follicle extractor according to claim 1, characterized in that, The rotating assembly includes a main shaft section and a transmission section. The mounting end of the rotating assembly is disposed on the main shaft section, and the transmission end of the rotating assembly is disposed on the transmission section. The main shaft section and the transmission section are connected by a torque transmission structure that allows axial sliding. The buffer assembly includes a second elastic element disposed between the main shaft section and the transmission section, so that the main shaft section can generate axial displacement relative to the transmission section.

6. The hair follicle extractor according to claim 5, characterized in that, The second elastic element is a spring.

7. The hair follicle extractor according to claim 5, characterized in that, The buffer assembly further includes at least one first bearing and a first elastic element that are axially slidably mounted within the housing; The spindle section is installed on the inner ring of the first bearing. The housing includes a bearing chamber for accommodating the first bearing. A limiting part is provided on the inner wall of the bearing chamber. The first elastic element is disposed between the limiting part and the outer ring of the first bearing.

8. The hair follicle extractor according to any one of claims 1 to 7, characterized in that, It also includes a second bearing, through which the drive end of the rotating assembly is mounted within the housing.

9. The hair follicle extractor according to claim 8, characterized in that, The housing includes a connecting sleeve, a first bushing, and a second bushing; the first bushing is screwed to one end of the connecting sleeve, and the second bushing is screwed to the other end of the connecting sleeve.

10. The hair follicle extractor according to claim 9, characterized in that, It also includes a handle body, a drive motor installed in the handle body, and a battery, wherein the output shaft of the drive motor is connected to the transmission end of the rotating assembly.

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