Therapeutic apparatus
Through the design of screw connection and locking mechanism, the problem of unstable connection between the treatment head and the handle is solved, and the rapid replacement and stable connection of the treatment head is achieved, which improves the flexibility and convenience of the treatment device.
Patent Information
- Application Number
- CN202422210938.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-09
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-09-09
AI Technical Summary
The integrated design of the treatment head and handle of the existing treatment instrument leads to a single function and the connection stability of the instrument that can replace the treatment head has difficulties.
The treatment head and handle that adopt a screw connection method are combined with the locking mechanism, including the first and second locking parts and unlocking keys, locking or unlocking is achieved through changes in rotational position to ensure a stable connection between the treatment head and the handle.
It realizes rapid replacement and stable connection of the treatment head, avoids loosening, and improves the flexibility and convenience of the treatment device.
Smart Images
Figure CN223062810U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of beauty instruments, in particular to a therapeutic instrument. Background Art
[0002] There are many kinds of beauty instruments on the market, including ultrasonic therapy instruments, radio frequency therapy instruments, and intense pulse therapy instruments. These therapeutic instruments are usually composed of a treatment head and a handle. If the treatment head and the handle are designed as one, the treatment head cannot be replaced, and there is a problem of single function. Therefore, in order to improve the flexibility of the therapeutic instrument, a single handle can be equipped with different types of treatment heads. The treatment head and the handle can be separated, and then the handle can be connected with the required treatment head to achieve flexible use of the therapeutic instrument. However, in the current therapeutic instruments with replaceable treatment heads, in order to ensure the stability of the connection between the treatment head and the handle, it is often not easy to disassemble and assemble. Utility Model Content
[0003] The main purpose of the utility model is to provide a therapeutic device, which aims to ensure that the therapeutic head and the handle are stably connected and realize the rapid disassembly and assembly of the therapeutic head and the handle.
[0004] To achieve the above-mentioned purpose, the therapeutic device proposed in the utility model includes a handle, a therapeutic head and a locking mechanism. The therapeutic head is screwed to the handle, and the therapeutic head has a first position that can be separated from the handle and a second position that can be rotatably engaged relative to the handle. The locking mechanism is arranged on the handle and / or the therapeutic head, and the locking mechanism is configured so that when the therapeutic head is rotated to the second position, the locking mechanism can realize locking or unlocking between the therapeutic head and the handle.
[0005] In one embodiment, the locking mechanism includes a first locking member and an unlocking key, the first locking member is telescopically disposed on the handle, a first locking groove is recessed on the surface of the treatment head, when the treatment head is rotated to the second position, the first locking member is opposite to the first locking groove, and the unlocking key is transmission-connected to the first locking member for driving the first locking member to be inserted into or disengaged from the first locking groove.
[0006] In one embodiment, the locking mechanism further includes a first elastic member, and two ends of the first elastic member are respectively connected to the handle and the first locking member, so as to provide the first locking member with a tendency to move toward the first locking groove.
[0007] In one embodiment, the unlocking key is a press key, which includes a press cap and a press rod, wherein the press cap is at least partially exposed from the outer shell of the handle, and the press rod is protruding from the side of the press cap facing the first locking member, and the press rod is transmission-connected to the first locking member, and the press rod is pressed downward to drive the first locking member to disengage from the first locking groove.
[0008] In one embodiment, the first locking member includes a telescopic rod and a convex block protruding from the periphery of the telescopic rod, a surface of the convex block facing the pressing key is provided as a first guide slope, and the first guide slope is provided in an inclined manner toward the treatment head. The end surface of the pressing rod facing away from the pressing cap is provided as a second guide slope, and the inclination angle of the second guide slope is consistent with the inclination angle of the first guide slope. When the pressing key is pressed, the second guide slope and the first guide slope slide relative to each other, thereby pushing the telescopic rod out of the first locking groove.
[0009] In one embodiment, the locking mechanism further includes a second elastic member, and the second elastic member is connected to the push button and is used to drive the push button to reset.
[0010] In one embodiment, the unlocking key is a sliding key, which is slidably disposed on the outer shell of the handle, and the sliding key is at least partially penetrated through the outer shell of the handle to connect with the first locking piece, the sliding key slides toward the side where the treatment head is located, thereby driving the first locking piece to be inserted into the first locking groove, and the sliding key slides in a direction away from the treatment head, thereby driving the first locking piece to disengage from the first locking groove.
[0011] In one embodiment, the locking mechanism further includes a third elastic member, wherein the third elastic member is connected to the sliding key and is used to drive the sliding key to slide and reset.
[0012] In one embodiment, the locking mechanism also includes a second locking piece, which is telescopically disposed on the handle and spaced apart from the first locking piece. A second locking groove is also recessed on the surface of the treatment head. When the treatment head is rotated to the second position, the second locking piece is aligned with the second locking groove to be inserted into the second locking groove.
[0013] In one embodiment, a receiving groove is provided at one end of the handle facing the treatment head, and a screwing channel is recessed in the peripheral side wall of the receiving groove. A plugging block protrudes from one side of the treatment head facing the handle, and a convex tooth protrudes from the peripheral side wall of the plugging block. The plugging block is inserted into the receiving groove, and the convex tooth rotates between the starting point and the ending point of the screwing channel. When the convex tooth rotates to the starting point of the screwing channel, the treatment head can be separated from the handle relatively. When the convex tooth rotates to the ending point of the screwing channel, the treatment head is clamped with the handle.
[0014] The connection between the treatment head and the handle in this therapeutic instrument by screwing can achieve the rapid replacement of the treatment head, so as to adapt to different treatment requirements. Moreover, the locking mechanism provided in this therapeutic instrument can ensure the stable connection between the treatment head and the handle, effectively avoiding the loosening phenomenon of the treatment head. Brief Description of the Drawings
[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.
[0016] Figure 1 It is a schematic assembly diagram of the handle and the treatment head of an embodiment of the therapeutic instrument provided by the present invention;
[0017] Figure 2 It is an exploded view of the handle in an embodiment of the therapeutic instrument provided by the present invention;
[0018] Figure 3 It is a schematic structural diagram of the first locking member and the unlocking key in an embodiment of the therapeutic instrument provided by the present invention;
[0019] Figure 4 It is a schematic partial structure diagram of the treatment head in an embodiment of the therapeutic instrument provided by the present invention;
[0020] Figure 5 It is a three-dimensional structural diagram of the handle in an embodiment of the therapeutic instrument provided by the present invention;
[0021] Figure 6 It is a sectional view of the handle in an embodiment of the therapeutic instrument provided by the present invention;
[0022] Figure 7 It is an exploded view of the treatment head in an embodiment of the therapeutic instrument provided by the present invention.
[0023] Explanation of the Reference Numerals in the Drawings:
[0024] 100, Therapeutic instrument; 10, Handle; 11, Housing; 12, First connector; 121, Receiving groove; 122, Screwing channel; 1221, First channel; 1222, Second channel; 123, First telescopic groove; 124, Second telescopic groove; 13, First locking member; 131, Telescopic rod; 132, Bump; 1321, First guiding inclined surface; 14, First elastic member; 15, Second locking member; 16, Fourth elastic member; 17, Unlock key; 171, Pressing cap; 172, Pressing rod; 1721, Second guiding inclined surface; 20, Treatment head; 21, Housing body; 22, Second connector; 221, Insertion block; 222, Convex teeth; 223, First locking groove; 224, Second locking groove.
[0025] The realization, functional features and advantages of the purpose of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments
[0026] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.
[0027] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.
[0028] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution that satisfies both A and B at the same time. In addition, the technical solutions between the embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.
[0029] The present utility model provides a therapeutic instrument 100.
[0030] Please refer to Figure 1 Figure 1 , an embodiment of the treatment instrument 100 includes a handle 10, a treatment head 20 and a locking mechanism. The treatment head 20 is screwed to the handle 10. The treatment head 20 has a first position where it can be separated from the handle 10 and a second position where it can be rotationally locked to the handle 10. The locking mechanism is provided on the handle 10 and / or the treatment head 20, and is configured to lock or unlock the treatment head 20 and the handle 10 when the treatment head 20 rotates to the second position.
[0031] The treatment head 20 and the handle 10 in the treatment instrument 100 are screwed together, such as by a threaded connection. During the screwing process of the treatment head 20 and the handle 10, the treatment head 20 can rotate between the first position and the second position. When the treatment head 20 is in the first position, the treatment head 20 is screwed to the loosest state, at this time, the treatment head 20 can be separated from the handle 10; when the treatment head 20 is screwed to the second position, the treatment head 20 is screwed to the tightest state, at this time, the treatment head 20 is screwed to the limit state. In order to prevent the treatment head 20 and the handle 10 from loosening during use and ensure the stability of the connection of the treatment head 20, the treatment instrument 100 is provided with a locking mechanism at the connection between the handle 10 and the treatment head 20 or at the connection between the treatment head 20 and the handle 10. When the treatment head 20 rotates to the second position, the locking mechanism can lock and unlock the treatment head 20 and the handle 10. When the locking mechanism locks the treatment head 20 and the handle 10, the treatment head 20 cannot rotate and thus is stably maintained in the second position. When it is necessary to remove the treatment head 20 for replacement, the locking mechanism can be switched to the unlocked state to release the lock between the treatment head 20 and the handle 10. At this time, the treatment head 20 can be screwed off from the handle 10.
[0032] In summary, the treatment head 20 and the handle 10 in the treatment instrument 100 are connected by screwing, which can achieve rapid replacement of the treatment head 20 to meet different treatment needs. Moreover, the locking mechanism provided in the treatment instrument 100 can ensure the stable connection between the treatment head 20 and the handle 10, effectively avoiding the loosening of the treatment head 20.
[0033] Refer to Figure 2 、 Figure 3 and Figure 7 Figure 7 , in some embodiments of the present invention, the locking mechanism includes a first locking member 13 and an unlocking key 17. The first locking member 13 is telescopically arranged on the handle 10. A first locking groove 223 is recessed on the surface of the treatment head 20. When the treatment head 20 rotates to the second position, the first locking member 13 is aligned with the first locking groove 223, and the unlocking key 17 is in transmission connection with the first locking member 13 for driving the first locking member 13 to insert into or disengage from the first locking groove 223.
[0034] In this embodiment, the locking mechanism includes a first locking member 13 and an unlocking key 17. The first locking member 13 is disposed at the connection between the handle 10 and the treatment head 20, and the first locking member 13 is configured to be able to extend and retract towards and away from the treatment head 20. The unlocking member is disposed on the outer shell 11 of the handle 10 and is in transmission connection with the first locking member 13. When the treatment head 20 rotates to the second position, the first locking member 13 is exactly opposite to the first locking groove 223. At this time, the unlocking key 17 can drive the first locking member 13 to insert into the first locking groove 223, thereby realizing the locking of the treatment head 20 and the handle 10. When unlocking is required, the unlocking key 17 can drive the first locking member 13 to disengage from the first locking groove 223, thereby realizing the unlocking of the treatment head 20 and the handle 10.
[0035] Furthermore, the locking mechanism further includes a first elastic member 14, such as a spring, a rubber pad, and a corrugated pipe, etc. The two ends of the first elastic member 14 are respectively connected to the handle 10 and the first locking member 13, and are used to provide a tendency for the first locking member 13 to move towards the first locking groove 223. Thus, when the treatment head 20 rotates to the second position, the first locking member 13 can automatically insert into the first locking groove 223 under the elastic force of the first elastic member 14, realizing the automatic locking of the treatment head 20 and the handle 10.
[0036] In one embodiment, the unlocking key 17 is a push button. The push button includes a pressing cap 171 and a pressing rod 172. The pressing cap 171 is at least partially exposed on the outer shell 11 of the handle 10 for the user to touch and press. The pressing rod 172 protrudes from the side of the pressing cap 171 facing the first locking member 13. The pressing rod 172 is in transmission connection with the first locking member 13. When the user presses the pressing cap 171 downwards, the pressing rod 172 presses downwards and then drives the first locking member 13 to disengage from the first locking groove 223. The design of the push button allows the user to easily unlock the treatment head 20 through a simple pressing action.
[0037] Specifically, the first locking member 13 includes a telescopic rod 131 and a convex block 132 protruding from the peripheral side of the telescopic rod 131. One surface of the convex block 132 facing the push button is provided with a first guiding inclined surface 1321, and the first guiding inclined surface 1321 is inclined towards the treatment head 20. The end surface of the pressing rod 172 facing away from the pressing cap 171 is provided with a second guiding inclined surface 1721, and the inclination angle of the second guiding inclined surface 1721 is the same as that of the first guiding inclined surface 1321. When the push button is pressed, the second guiding inclined surface 1721 and the first guiding inclined surface 1321 undergo relative sliding, thereby pushing the telescopic rod 131 out of the first locking groove 223, thus realizing the unlocking of the treatment head 20 and the handle 10.
[0038] Among them, the inclination angles of the first guide inclined surface 1321 and the second guide inclined surface 1721 are preferably 45°. The 45° inclination angle enables the user to apply a moderate force when pressing the unlocking key 17, neither requiring too much force due to too small an angle nor making the unlocking operation too easy due to too large an angle, thus avoiding the phenomenon of accidental unlocking.
[0039] In addition, the locking mechanism further includes a second elastic member (not labeled), such as a spring or a rubber pad, etc. The second elastic member is connected to the pressing key and is used to drive the pressing key to reset. The setting of the second elastic member enables the pressing key to automatically reset after being pressed, so that no additional operation by the user is required.
[0040] In another embodiment, the unlocking key 17 is a sliding key. The sliding key is slidably arranged on the outer shell 11 of the handle 10, and at least part of the sliding key penetrates through the outer shell 11 of the handle 10 to be connected to the first locking member 13. When the sliding key slides towards the side where the treatment head 20 is located, the sliding key will drive the first locking member 13 to insert into the first locking groove 223, thereby realizing the locking of the treatment head 20 and the handle 10; when the sliding key slides towards the direction away from the treatment head 20, the sliding key will drive the first locking member 13 to disengage from the first locking groove 223, thereby realizing the unlocking of the treatment head 20 and the handle 10. Obviously, the design of the sliding key allows the user to realize the locking and unlocking of the treatment head 20 through a simple sliding action.
[0041] At this time, the locking mechanism further includes a third elastic member (not labeled). The third elastic member is connected to the sliding key and is used to drive the sliding key to slide and reset. The setting of the third elastic member enables the sliding key to automatically reset to the initial position after performing the unlocking or locking operation, avoiding the user's manual reset operation and improving the convenience of the operation.
[0042] Referring to Figure 4 、 Figure 5 and Figure 6 , in an embodiment of the present invention, the locking mechanism further includes a second locking member 15. The second locking member 15 is telescopically arranged on the handle 10 and is spaced from the first locking member 13. At this time, a second locking groove 224 is further recessed on the surface of the treatment head 20. As Figure 7 shown, when the treatment head 20 rotates to the second position, the second locking member 15 is aligned with the second locking groove 224 to insert into the second locking groove 224.
[0043] At this time, the locking mechanism further includes a fourth elastic member 16. The two ends of the fourth elastic member 16 are respectively connected to the handle 10 and the second locking member 15, and are used to provide a tendency for the second locking member 15 to move towards the second locking groove 224. When the treatment head 20 rotates to the second position, the first locking member 13 automatically inserts into the first locking groove 223 under the action of the first elastic member 14, and the second locking member 15 automatically inserts into the second locking groove 224 under the action of the fourth elastic member 16, thereby realizing the locking of the treatment head 20. In this embodiment, by providing the second locking member 15 and the first locking member 13, the treatment head 20 can be locked by two locking members simultaneously when it rotates to the second position, thus ensuring the stability of the connection between the treatment head 20 and the handle 10. In addition, when the second locking member 15 inserts into the second locking groove 224, it can produce a clear click sound to remind the user that the locking action has been completed.
[0044] Regarding the screwing connection between the treatment head 20 and the handle 10, one end of the handle 10 facing the treatment head 20 is provided with a receiving groove 121, and a screwing channel 122 is recessed on the circumferential side wall of the receiving groove 121. A plugging block 221 protrudes from one side of the treatment head 20 facing the handle 10, and a convex tooth 222 protrudes from the circumferential side wall of the plugging block 221. The plugging block 221 is inserted into the receiving groove 121, and the convex tooth 222 rotates between the starting point and the ending point of the screwing channel 122. When the convex tooth 222 rotates to the starting point of the screwing channel 122, the treatment head 20 can be separated from the handle 10, and when the convex tooth 222 rotates to the ending point of the screwing channel 122, the treatment head 20 is clamped with the handle 10.
[0045] Refer to Figure 2 、 Figure 4 and Figure 5 As shown in FIGS. and, the handle 10 includes a housing 11 and a first connector 12. One end of the housing 11 facing the treatment head 20 is open, and the first connector 12 is detachably installed in the opening of the housing 11. A receiving groove 121 is recessed on one side of the first connector 12 facing the treatment head 20. A screwing channel 122 is recessed on the circumferential side wall of the receiving groove 121. The screwing channel 122 includes a first channel 1221 and a second channel 1222. The first channel 1221 extends along the axis direction of the handle 10, and the second channel 1222 communicates with the first channel 1221 and extends along the circumferential direction of the receiving groove 121. A first telescopic groove 123 and a second telescopic groove 124 are recessed on the bottom wall of the receiving groove 121. At least a part of the first locking member 13 is disposed in the first telescopic groove 123, and at least a part of the second locking member 15 is disposed in the second telescopic groove 124. At this time, the first elastic member 14 is disposed in the first telescopic groove 123. One end of the first elastic member 14 is connected to the first locking member 13, and the other end is connected to the bottom wall of the first telescopic groove 123. Similarly, the fourth elastic member 16 is also disposed in the second telescopic groove 124. One end of the fourth elastic member 16 is connected to the second locking member 15, and the other end is connected to the bottom wall of the second telescopic groove 124.
[0046] Referring to Figure 7 , the treatment head 20 includes a housing 21 and a second connector 22. One end of the housing 21 facing the handle 10 is open. The second connector 22 is detachably mounted at the open end of the housing 21. A plug block 221 protrudes from the side of the second connector 22 facing the handle 10, and convex teeth 222 protrude from the peripheral side wall of the plug block 221. The first locking groove 223 and the second locking groove 224 are both provided on the end face of the plug block 221.
[0047] When the treatment head 20 needs to be docked with the handle 10, first align the convex teeth 222 with the first channel 1221, and then insert the plug block 221 into the receiving groove 121. At this time, the first locking member 13 and the second locking member 15 are respectively contracted in the first telescopic groove 123 and the second telescopic groove 124 under the pressing action of the plug block 221, and the first elastic member 14 and the fourth elastic member 16 are in a compressed state. Subsequently, rotate the treatment head 20. When the convex teeth 222 rotate to the second channel 1222 and abut against the end wall of the second channel 1222, the treatment head 20 rotates to the second position. At this time, the first locking member 13 is aligned with the first locking groove 223 and automatically inserted into the first locking groove 223 under the elastic force of the first elastic member 14, and the second locking member 15 is aligned with the second locking groove 224 and automatically inserted into the second locking groove 224 under the action of the fourth elastic member 16, thereby realizing the locking of the treatment head 20.
[0048] The above is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structural transformation made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied to other related technical fields, is included in the patent protection scope of the present invention.
Claims
1. A therapeutic apparatus, characterized in that, include: handle; A treatment head, the treatment head is screwed to the handle, and the treatment head has a first position where it can be separated from the handle and a second position where it can be rotatably engaged with the handle; A locking mechanism is provided on the handle and / or the treatment head, and is configured to lock or unlock the treatment head and the handle when the treatment head is rotated to the second position.
2. The therapeutic apparatus according to claim 1, wherein, The locking mechanism comprises: A first locking member, which is telescopically disposed on the handle, a first locking groove is concavely disposed on the surface of the treatment head, and when the treatment head is rotated to the second position, the first locking member is directly opposite to the first locking groove; An unlocking key is drivingly connected to the first locking member and is used to drive the first locking member to be inserted into the first locking groove or to be disengaged from the first locking groove.
3. The therapeutic apparatus according to claim 2, wherein The locking mechanism further includes a first elastic member, two ends of which are respectively connected to the handle and the first locking member, for providing the first locking member with a tendency to move toward the first locking groove.
4. The therapeutic apparatus according to claim 2, characterized in that, The unlocking key is a press key, which includes a press cap and a press rod. The press cap is at least partially exposed from the outer shell of the handle, and the press rod is protruding from the side of the press cap facing the first locking piece. The press rod is transmission-connected to the first locking piece, and the press rod is pressed downward to drive the first locking piece to disengage from the first locking groove.
5. The therapeutic apparatus according to claim 4, wherein, The first locking member comprises a telescopic rod and a convex block protruding from the periphery of the telescopic rod, a surface of the convex block facing the pressing key is provided as a first guide slope, and the first guide slope is provided in an inclined manner toward the treatment head; The end surface of the pressure rod facing away from the pressure cap is set as a second guide bevel, and the inclination angle of the second guide bevel is consistent with the inclination angle of the first guide bevel. When the push key is pressed, the second guide bevel and the first guide bevel slide relative to each other, thereby pushing the telescopic rod out of the first locking groove.
6. The therapeutic apparatus according to claim 4, wherein, The locking mechanism further includes a second elastic member, which is connected to the push button and is used to drive the push button to reset.
7. The therapeutic apparatus according to claim 2, characterized in that, The unlocking key is a sliding key, which can be slidably arranged on the outer shell of the handle, and the sliding key is at least partially penetrated through the outer shell of the handle to be connected with the first locking piece, the sliding key slides toward the side where the treatment head is located, thereby driving the first locking piece to be inserted into the first locking groove, and the sliding key slides in a direction away from the treatment head, thereby driving the first locking piece to disengage from the first locking groove.
8. The therapeutic apparatus according to claim 7, characterized in that, The locking mechanism further comprises a third elastic member, wherein the third elastic member is connected to the sliding key and is used for driving the sliding key to slide and reset.
9. The therapeutic apparatus according to claim 2, wherein, The locking mechanism also includes a second locking piece, which is telescopically arranged on the handle and spaced apart from the first locking piece. A second locking groove is also recessed on the surface of the treatment head. When the treatment head is rotated to the second position, the second locking piece is opposite to the second locking groove so as to be inserted into the second locking groove.
10. The therapeutic apparatus according to claim 1, characterized in that, One end of the handle facing the treatment head is provided with a receiving groove, and a screwing channel is recessed in the peripheral side wall of the receiving groove; One side of the treatment head facing the handle is provided with a plug-in block, and convex teeth are protruded on the peripheral side wall of the plug-in block. The plug-in block is inserted into the receiving groove, and the convex teeth rotate between the starting point and the ending point of the screwing channel. When the convex teeth rotate to the starting point of the screwing channel, the treatment head can be separated from the handle relatively. When the convex teeth rotate to the ending point of the screwing channel, the treatment head is clamped with the handle.