Skin tensioning device

Abstract

The invention provides a skin tensioning device which comprises a base and a plurality of sliding plates, the base is provided with a plurality of edges, the sliding plates are arranged on the edges of the base, and each sliding plate comprises a sliding plate body and an elastic piece; the sliding plate main body is movably connected with the edge of the base, the sliding plate main body is provided with a skin contact part, a retention needle is arranged on the skin contact part, and the sliding plate main body is fixed to the skin of a patient through the retention needle; one end of the elastic piece abuts against the outer side of the edge of the base, the other end of the elastic piece abuts against the sliding plate body, and the sliding plate body is pushed outwards. According to the invention, enough tensile force can be provided while an enough surgical area is provided, and the device can be perfectly attached to the scalp.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a skin tensioning device. Background Technology

[0002] In robot-assisted hair transplantation surgery, scalp tension is a crucial technical aspect, directly affecting the precision of hair follicle extraction and implantation, surgical efficiency, and postoperative results. During follicle extraction, insufficient tension can lead to inaccurate follicle cutting (e.g., oblique or deep cuts), increasing the risk of damage. During implantation, insufficient tension makes it difficult to maintain a stable implantation hole shape, resulting in deviations in follicle placement angles or follicle ejection.

[0003] Existing scalp tensioning devices suffer from problems such as insufficient precision control of tension force, inability to perfectly fit the scalp, and insufficient tension area affecting surgical efficiency.

[0004] In view of this, the inventors of this application have designed a skin tensioning device in order to overcome the above-mentioned technical problems. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the existing scalp tensioning device, such as insufficient precision control of tension force, inability to perfectly fit the scalp, and insufficient tension area affecting surgical efficiency, and to provide a skin tensioning device.

[0006] The present invention solves the above-mentioned technical problems through the following technical solution:

[0007] This invention provides a skin tensioning device, characterized in that the skin tensioning device includes a base and a plurality of sliding plates. The base has a plurality of edges, and the sliding plates are disposed on the edges of the base. Each sliding plate includes a sliding plate body and an elastic element. The sliding plate body is movably connected to the edge of the base, and the sliding plate body is provided with a skin contact portion. A retaining pin is disposed on the skin contact portion to fix the sliding plate body to the patient's skin. One end of the elastic element abuts against the outer edge of the base, and the other end of the elastic element abuts against the sliding plate body, pushing the sliding plate body outward.

[0008] According to one or more embodiments of the present invention, the base is provided with straps for fixing the base during hair transplantation surgery.

[0009] According to one or more embodiments of the present invention, the sliding plate further includes a guide member that passes through the edges of both the sliding plate body and the base. The guide member is fixedly connected to the sliding plate body and movably connected to the edge of the base. The sliding plate slides along the axial direction of the guide member along the edge of the base. The elastic member pushes the sliding plate body outward along the axial direction of the guide member.

[0010] According to one or more embodiments of the present invention, the skin contact portion is arc-shaped and is disposed at the lower part of the sliding plate body.

[0011] According to one or more embodiments of the present invention, the retaining needle is covered with a needle protective sleeve.

[0012] According to one or more embodiments of the present invention, the strap is a silicone strip.

[0013] According to one or more embodiments of the present invention, the elastic element is a spring, and the guide element is a positioning screw.

[0014] According to one or more embodiments of the present invention, a plurality of mis-proof mounting portions with different structures are provided on different edges of the base; a plurality of sliding plates are respectively provided with mis-proof mating portions that correspond one-to-one with the mis-proof mounting portions; the mis-proof mounting portions and the mis-proof mating portions are configured such that each sliding plate, by virtue of its own mis-proof mating portion, can only successfully dock and install with the mis-proof mounting portion on its own target edge on the base, and cannot complete the installation with other mis-proof mounting portions on other non-target edges.

[0015] According to one or more embodiments of the present invention, a groove is provided in the middle of the upper part of the sliding plate body, and the edge of the base is engaged in the groove; a guide hole is provided through the edge of the base, the guide member is located in the groove, the two ends of the guide member are fixedly connected to the two side walls of the groove, and the middle part of the guide member passes through the guide hole; one end of the elastic member abuts against the outer side of the edge of the base, and the other end of the elastic member abuts against the side wall of the outer side of the groove.

[0016] According to one or more embodiments of the present invention, the base is rectangular, and the sliding plate includes at least four, the four sliding plates being respectively disposed on the four edges of the rectangular base.

[0017] The positive and progressive effects of this invention are as follows:

[0018] The skin tensioning device of the present invention has at least the following advantages:

[0019] 1. The skin tensioning device pushes the sliding plate outward through the elastic element, realizing automatic and uniform tensioning of the skin in the surgical area, and providing a stable and flat working surface for robot operation;

[0020] Second, by combining macroscopic fixation with the macroscopic fixation of the bandage with microscopic fixation of the skin contact area with the fixation pin, the stability of the tensioning device with the skin during surgery is ensured;

[0021] Third, the skin tensioning device adopts a mechanical error-proof design to avoid misinstallation of the sliding plate and ensure the accuracy of the visual label position.

[0022] Fourth, the labels provide precise coordinate positioning for the robot vision system, enabling it to extract and implant hair follicles efficiently and accurately, significantly improving the overall precision, efficiency, and safety of robotic hair transplant surgery. Attached Figure Description

[0023] The above and other features, properties and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings and embodiments, in which the same reference numerals always denote the same features, wherein:

[0024] Figure 1a This is a front view structural schematic diagram of an embodiment of the skin tensioning device of the present invention.

[0025] Figure 1b This is a side view of one embodiment of the skin tensioning device of the present invention.

[0026] Figure 2 This is an exploded view of one embodiment of the skin tensioning device of the present invention.

[0027] Figure 3 This is a schematic diagram of the mechanical error-proof design of one embodiment of the skin tensioning device of the present invention.

[0028] Figure 4a This is a front view schematic diagram of the compressed state of an embodiment of the skin tensioning device of the present invention.

[0029] Figure 4b This is a front view schematic diagram of the skin tensioning device of the present invention in its free-release state according to an embodiment.

[0030] Figure 5 This is a three-dimensional schematic diagram of the compressed state of an embodiment of the skin tensioning device of the present invention.

[0031] Figure 6 This is a cross-sectional view of a compressed state of an embodiment of the skin tensioning device of the present invention.

[0032] Figure 7 This is a schematic diagram of the strap usage state of an embodiment of the skin tensioning device of the present invention.

[0033] Figure 8 This is a three-dimensional structural schematic diagram of an embodiment of the skin tensioning device of the present invention.

[0034] Figure 9 This is a schematic diagram of label identification in one embodiment of the skin tensioning device of the present invention.

[0035] [Attached image labels]

[0036] 100. Base

[0037] 110. Edge

[0038] 120. Straps

[0039] 130. Error-proof installation department

[0040] 140. Guide hole

[0041] 200. Sliding plate

[0042] 210. Main body of the sliding plate

[0043] 211. Skin contact area

[0044] 212. Fixation needle

[0045] 213. Needle protective sleeve

[0046] 214. Tags

[0047] 215. Identification Department

[0048] 216. Mistake-proofing coordination department

[0049] 217. Groove

[0050] 220. Guide components

[0051] 230. Elastic component

[0052] 201. First sliding plate

[0053] 202. Second sliding plate

[0054] 203. Third sliding plate

[0055] 204. Fourth sliding plate

[0056] 300. Hair transplant head frame Detailed Implementation

[0057] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0058] Reference will now be made in detail to preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numerals will be used in all drawings to denote the same or similar parts. Furthermore, although the terminology used herein is selected from commonly known and used terms, some terms mentioned in this specification may have been chosen by the applicant at his or her discretion, and their detailed meanings are explained in the relevant sections of the description herein. Moreover, the invention should be understood not only by the actual terms used, but also by the meaning implied by each term. Also, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. It should be noted that similar reference numerals and letters in the drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0059] See Figures 1a-7 This invention provides a skin tensioning device, including a base 100 and a plurality of sliding plates 200. The base 100 has a plurality of edges 110, and the sliding plates 200 are disposed at the edges 110 of the base 100. Each sliding plate includes a sliding plate body 210 and an elastic element 230. The sliding plate body 210 is movably connected to the edge of the base 100. The sliding plate body 210 is provided with a skin contact portion 211, and a retaining pin 212 is provided on the skin contact portion 211 to fix the sliding plate body 210 to the patient's skin. One end of the elastic element 230 abuts against the outer side of the edge 110 of the base 100, and the other end abuts against the sliding plate body 210, pushing the sliding plate body 210 outward.

[0060] The skin tensioning device of the present invention is fixed to the patient's skin by the retaining pins 212 on the skin contact portion 211 of the sliding plate body 210, and then provides tension force on the skin by pushing the sliding plate body 210 outward through the elastic element 230. The skin tensioning device of the present invention can be used for robot-assisted hair transplantation.

[0061] During the procedure, the fixation needle 212 is inserted into the skin, which fixes the sliding plate body 210 to the scalp to ensure that the tension can be effectively transmitted to the skin.

[0062] See Figures 1a-2 , Figures 4a-5 , Figure 7 and Figure 8 As a preferred embodiment of the skin tensioning device of the present invention, the base 100 is provided with a strap 120 for fixing the base 100 during hair transplantation surgery;

[0063] During the hair transplant surgery, the base 100 is fixedly connected to the hair transplant head frame 300 by the straps 120 on the base 100, thereby fixing the base 100.

[0064] See Figure 3 and Figure 6 In a preferred embodiment of the skin tensioning device of the present invention, the sliding plate 200 further includes a guide member 220, which passes through both the sliding plate body 210 and the edge 110 of the base 100. The guide member 220 is fixedly connected to the sliding plate body 210 and movably connected to the edge 110 of the base 100, so that the sliding plate 200 can slide on the edge of the base along the axial direction of the guide member 220. The elastic member 230 pushes the sliding plate body 210 outward along the axial direction of the guide member 220, and the guide member 220 can constrain and guide the thrust provided by the elastic member 230 to always point outward.

[0065] See Figure 5 and Figure 8 In a preferred embodiment of the skin tensioning device of the present invention, the skin contact portion 211 is arc-shaped and is disposed at the lower part of the sliding plate body 210.

[0066] It should be noted that the arc design is a contoured design that mimics the curvature of the scalp, allowing it to fit snugly against the scalp during use.

[0067] The curvature of the back of the human head is typically R70. However, considering wider applicability to different populations and the increased curvature of the head after the injection of tumescent fluid, the curvature of the curved skin contact portion 211 is preferably designed to conform to the head shape with an R120 curvature, ensuring a perfect fit to the scalp. The curvature range of the curved skin contact portion 211 is typically R70-R120.

[0068] See Figure 1b-Figure 2 In a preferred embodiment of the skin tensioning device of the present invention, the fixation needle 212 is covered with a needle protective sleeve 213.

[0069] Preferably, the needle protective sleeve 213 can be inserted into the sliding plate 200 from below to protect the needle.

[0070] See Figure 1a , Figure 2 , Figure 5 , Figure 7 and Figure 8 In a preferred embodiment of the skin tensioning device of the present invention, the strap 120 is a silicone strip.

[0071] Preferably, such as Figure 2 As shown, the silicone strip can be inserted into the corresponding hole of the base 100 and connected to the base 100. During the hair transplant surgery, the silicone strip is fixedly connected to the hair transplant head frame 300, thereby fixing the base 100.

[0072] When using it, first insert the tensioning device back fixation pin 212 into the scalp donor area, press the surface of the tensioning device with one hand to prevent the tensioning device from opening suddenly, and then tie the silicone tubes on both sides into the hair transplant head frame 300 slots around the head (if there are no slots, they can be tied to a suitable position for fixation) to ensure that the tensioning device is completely fixed in the patient's head donor area and is not easy to move.

[0073] See Figure 2 and Figure 6 In a preferred embodiment of the skin tensioning device of the present invention, the elastic element 230 is a spring and the guide element 220 is a positioning screw.

[0074] like Figure 6 The figure shows a cross-sectional view of the tensioning device in a compressed state. One end of the spring is limited by the sliding plate 200, and the other end is limited by the base 100. The positioning screw cooperates with the guide hole 140 of the base 100 to play a guiding role.

[0075] Preferably, three springs and two inter-axis positioning screws can be used in conjunction with the sliding plate 200 to connect the sliding plate 200 to the base 100, wherein the smooth part of the shoulder positioning screw can form a linear sliding pair with the guide hole 140 of the base 100.

[0076] When using, first remove the needle protective sleeve 213, such as Figure 4a As shown, press down on the four sides of the tensioning device with both hands, applying force F1 to the sliding plate 200 to fully contract the tensioning device. At this time, the spring is in a compressed state, and the retaining pin 212 is inserted into the scalp. After the tensioning device is further fixed by the silicone strip, as shown... Figure 4b As shown, when the four sliding plates 200 are released freely, the tensioning device can tension the scalp under the action of spring tension F2. During the free release process, it is necessary to ensure that the hand applies downward pressure P to the base 100 and maintains the pressing state to prevent the tensioning device from popping up.

[0077] In this invention, precise control of tension is achieved through the compression of a spring with a fixed stroke. Through simulation and clinical verification, we found that a single-sided compression stroke of 4mm and a tension of 30N can ensure appropriate scalp tension. Therefore, the design achieves this requirement by controlling the spring's elastic coefficient and stroke. By controlling parameters such as the spring's elastic coefficient, the tension of the tensioning device in this invention is precisely controlled.

[0078] In one embodiment, assuming the tension force reaches 50N or more, the simulation analysis process for the spring compression is as follows:

[0079] The analysis was performed using the SolidWorks Simulation nonlinear module.

[0080] The scalp material was modeled according to a size of 40mm*40mm*5mm and Mooney Rivlin hyperelastic material was used. The specific parameters are shown in Table 1 below.

[0081] Table 1. Parameters of Mooney Rivlin Hyperelastic Material for Scalp

[0082] Parameters of hyperelastic materials numerical values <![CDATA[Density (kg / m 3 )]]> 1133 Poisson's ratio 0.5 Elastic modulus (MPa) 1.48 K1 6.18±0.81 K2 <![CDATA[3.51e -5 ±1.3e -5 ]]>

[0083] The fixing method is to fix the four sides of the model as shown in Table 1 (a rigorous definition method also requires defining a fat layer below the model, a sliding coefficient on the contact surface, a skull layer below the fat layer, and a friction coefficient between the skull layer and the fat layer. This friction coefficient can be defined as 0.05 according to the literature. Then, the skull layer is fixed and constrained).

[0084] After the tensioning device is installed on the patient's head, it can be roughly assumed that the maximum tension force of the tensioning device is evenly distributed on the steel nails of each tensioning device. The tensioning device has 10 steel nails on one side, so it can be approximated that each steel nail bears a force of about 5N.

[0085] Analysis shows that after applying the corresponding tension force, the simulated displacement length of the skin is about 3.1 mm. Considering the internal friction and energy loss of the tensioning device during compression and opening, the energy consumption ratio is taken as 1.3:1. Therefore, the compression of the single-sided spring of the tensioning device is designed to be 4 mm, and the maximum compression of both sides is 8 mm.

[0086] See Figure 1a and Figure 2 As a preferred embodiment of the skin tensioning device of the present invention, a label 214 is provided on the upper part of the sliding plate body 210. The label 214 has multiple identification parts 215, which are used to cooperate with the robot's visual recognition system to locate the hair root position during surgery.

[0087] Preferably, the label 214 is disposed in the corresponding label slot of the sliding plate 200.

[0088] It should be noted that the skin tensioning device of the present invention can be used for robot-assisted hair transplantation. The tag 214 can be used in conjunction with the visual recognition system in the robot device to provide hair root positioning. The specific principle is as follows: a reference coordinate system can be generated with the corner point of the rectangular recognition part 215 on the tag 214 as the center, and several hair root position coordinate systems can be generated with the hair root position point of the surgical area as the center. Through the transformation relationship between the coordinate systems, the appropriate extraction pose of the hair root can be simulated.

[0089] The tag 214 has multiple recognition elements 215, ensuring that at least one recognition element 215 can be clearly captured from different robot perspectives, thus providing a stable and reliable reference coordinate system for the vision system. (See also...) Figure 1a and Figure 2 In one embodiment, the tag 214 has four identification parts 215.

[0090] like Figure 9 As shown, in the visual recognition system, the corners of the recognition parts 215 of each rectangle of the label 214 are marked with different colors, and the corresponding hair roots are also marked with different colors. The position of the hair roots is located by calculating the coordinate system of the hair roots and the corners of the corresponding recognition parts 215.

[0091] Compared to traditional manual hair transplantation, robotic hair transplantation has been booming in recent years and represents the future trend of the hair transplant industry. Traditional manual hair transplantation relies on the doctor's eyesight and hand stability. Even the best doctors experience slight physiological tremors, visual fatigue, and subjective judgment differences. This can lead to deviations in the angle, depth, and position of extraction and implantation, affecting the survival rate of extracted hair follicles. Moreover, manual extraction is an extremely energy-intensive task. Doctors need to maintain high concentration for extended periods, manually searching, extracting, separating, and implanting hair follicles. The maximum number of follicles that can be transplanted in a day is 2000-3000, and doctors become extremely fatigued, leading to a decline in efficiency and quality in the long run.

[0092] The tag points of the tensioning device in this invention serve as coordinate references for the machine vision system. The robot, using a high-definition camera to identify the tag 214 and the hair root, can calculate an extremely precise three-dimensional spatial position, with an accuracy within 0.1 mm. Based on the reference coordinate system generated by the tag points, the robot's vision system can accurately identify the angle of the hair and the depth of the hair follicle, precisely extracting the hair around the follicle while minimizing damage to the surrounding skin and hair follicle. A significant advantage over manual methods is the greatly improved hair follicle survival rate, ensuring highly uniform hair growth direction, angle, and density, thus achieving a supernatural appearance. The system quickly establishes a coordinate system by identifying the tag 214, then automatically scans, identifies, and locates extractable follicular units (FUs), at a speed far exceeding that of the human eye. Theoretically, the robot can work tirelessly continuously, significantly increasing the number of transplants per day.

[0093] See Figure 3 As a preferred embodiment of the skin tensioning device of the present invention, a plurality of foolproof mounting parts 130 with different structures are provided on different edges 110 of the base 100.

[0094] Each of the multiple sliding plates 200 is provided with a foolproof mating part 216 that corresponds to and matches the foolproof mounting part 130.

[0095] The foolproof mounting part 130 and the foolproof mating part 216 are configured such that each sliding plate 200 can only be successfully connected and installed with the foolproof mounting part 130 of its own target edge 110 on the base 100 by means of its own foolproof mating part 216, and cannot be installed with other foolproof mounting parts 130 of non-target edges 110.

[0096] It should be noted that the aforementioned foolproof installation part 130 and foolproof mating part 216 together constitute a mechanical foolproof structure, which forcibly ensures that the four sliding plates 200 can only be installed on the base 100 in a unique and correct spatial order and orientation. Through the physical uniqueness design, assembly errors are fundamentally prevented, ensuring the correct fit and reliable operation of the internal mechanical structure of the tensioning device.

[0097] Furthermore, the aforementioned mechanical error-proof structure can also ensure that the label 214 is installed in a certain order. During the installation of the four sliding plates 200 of the tensioning device of the present invention, it is necessary to ensure that the sliding plates 200 and the label 214 on the sliding plates 200 are installed in a certain order. Therefore, the aforementioned mechanical error-proof structure shown in FIG4 is designed to ensure that the sliding plates 200 and the label 214 are installed in the prescribed order.

[0098] The reason why the sliding plate 200 and the label 214 on the sliding plate 200 need to be installed in a certain order is that the label 214 can only be used in conjunction with the vision system if it is installed in the planned order. Therefore, a foolproof design is required between the sliding plate 200 and the base 100 to ensure that the label 214 and the sliding plate 200 are assembled in the planned order.

[0099] See Figure 2 and Figure 3 In a preferred embodiment of the skin tensioning device of the present invention, a groove 217 is provided in the middle of the upper part of the sliding plate body 210, and the edge 110 of the base 100 is engaged in the groove 217.

[0100] The base 100 has a guide hole 140 through its edge 110. The guide member 220 is located in the groove 217. The two ends of the guide member 220 are fixedly connected to the two side walls of the groove 217. The middle part of the guide member 220 passes through the guide hole 140.

[0101] One end of the elastic member 230 abuts against the outer side of the edge 110 of the base 100, and the other end of the elastic member 230 abuts against the outer side wall of the groove 217.

[0102] Preferably, a limiting groove is provided on the outer side of the edge 110 of the base 100, and a limiting groove is also provided on the side wall of the outer side of the groove 217, and the two ends of the elastic member 230 are respectively fixed in the two limiting grooves.

[0103] See Figure 3 In a preferred embodiment of the skin tensioning device of the present invention, the base 100 is rectangular, and the sliding plate 200 includes at least four, with the four sliding plates 200 respectively disposed on the four edges 110 of the rectangular base 100.

[0104] Preferably, the sliding plate 200 includes a first sliding plate 201, a second sliding plate 202, a third sliding plate 203, and a fourth sliding plate 204. Each sliding plate 200 is preferably equipped with three elastic elements 230 and two guide elements 220. The guide elements 220 connect the sliding plate 200 to the base 100, and the elastic elements 230 stretch the skin outward from four directions, providing tension in four directions.

[0105] The steps for using the skin tensioning device of the present invention in one embodiment are as follows:

[0106] 1. Remove the needle protective sleeve 213, and press the four sliding plates 200 with both hands to fully contract the tensioning device. At this time, the spring is in a compressed state (e.g., Figure 4a (As shown).

[0107] 2. Insert the bottom retaining pin 212 of the tensioning device into the scalp donor area, and press down on the surface of the tensioning device with one hand to prevent the tensioning device from opening suddenly (e.g., Figure 4b (As shown).

[0108] 3. Fix the silicone tubes on both sides of the tensioning device to the hair transplant head frame 300. After ensuring that the tensioning device is completely fixed in the donor area of ​​the patient's head and is not easy to move, slowly release the tensioning device that has been pressed.

[0109] The skin tensioning device of the present invention provides sufficient tension while offering a sufficient surgical area, and can perfectly conform to the scalp.

[0110] In summary, the skin tensioning device of the present invention, by pushing the sliding plate 200 outward through the elastic element 230, achieves automatic and uniform tensioning of the skin in the surgical area, providing a stable and flat working plane for robot operation; combined with the macroscopic fixation of the strap 120 and the microscopic fixation of the skin contact part 211 with the fixation pin 212, the stability of the tensioning device with the skin during surgery is ensured; its mechanical error-proof design avoids misinstallation of the sliding plate 200, ensuring the accuracy of the position of the visual label 214; and the label 214 provides precise coordinate positioning for the robot vision system, enabling it to perform hair follicle extraction and implantation efficiently and accurately, significantly improving the precision, efficiency, and safety of robotic hair transplantation surgery.

[0111] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A skin tensioning device, characterized in that, The skin tensioning device includes a base and multiple sliding plates. The base has multiple edges, and the sliding plates are disposed on the edges of the base. Each sliding plate includes a sliding plate body and an elastic element. The sliding plate body is movably connected to the edge of the base. The sliding plate body is provided with a skin contact portion and a fixation pin is provided on the skin contact portion. The fixation pin is used to fix the sliding plate body to the patient's skin. One end of the elastic element abuts against the outer edge of the base, and the other end of the elastic element abuts against the sliding plate body, pushing the sliding plate body outward.

2. The skin tensioning device as described in claim 1, characterized in that, The base is equipped with straps for securing it during hair transplant surgery.

3. The skin tensioning device as described in claim 1, characterized in that, The sliding plate also includes a guide member that passes through the edges of both the sliding plate body and the base. The guide member is fixedly connected to the sliding plate body and movably connected to the edge of the base. The sliding plate slides along the axial direction of the guide member along the edge of the base. The elastic member pushes the sliding plate body outward along the axial direction of the guide member.

4. The skin tensioning device as described in claim 1, characterized in that, The skin contact portion is arc-shaped and is located at the lower part of the sliding plate body.

5. The skin tensioning device as described in claim 1, characterized in that, The retaining needle is covered with a needle protective sleeve.

6. The skin tensioning device as described in claim 2, characterized in that, The strap is a silicone strip.

7. The skin tensioning device as described in claim 3, characterized in that, The elastic element is a spring, and the guide element is a positioning screw.

8. The skin tensioning device as described in claim 1, characterized in that, Several foolproof mounting parts with different structures are provided on different edges of the base; Each of the multiple sliding plates is provided with a foolproof mating part that corresponds to and matches the foolproof mounting part; The foolproof mounting part and the foolproof mating part are configured such that each sliding plate, by virtue of its own foolproof mating part, can only successfully dock and be installed with the foolproof mounting part on its own target edge on the base, and cannot be installed with other foolproof mounting parts that are not on the target edge.

9. The skin tensioning device as described in claim 1, characterized in that, The upper middle part of the sliding plate body is provided with a groove, and the edge of the base is engaged in the groove; The base has a through guide hole along its edge. The guide member is located in the groove. Both ends of the guide member are fixedly connected to the two side walls of the groove. The middle part of the guide member passes through the guide hole. One end of the elastic element abuts against the outer edge of the base, and the other end of the elastic element abuts against the outer sidewall of the groove.

10. The skin tensioning device as claimed in claim 1, characterized in that, The base is rectangular, and the sliding plate includes at least four sliding plates, which are respectively disposed on the four sides of the rectangular base.

Images