Handpiece and therapeutic device

Abstract

The utility model discloses a hand -held piece and therapeutic instrument relates to medical equipment technical field, wherein, hand -held piece includes handle and treatment head, the handle is provided with connecting seat and elastic piece to the one end of treatment head, the connecting seat is equipped with and the elastic piece opposite buckle position, treatment head is provided with screw knob to the one end of handle, when buckle position with screw knob buckle connection, elastic piece with screw knob elasticity abuts, to make screw knob buckle tightly at buckle position. The utility model provides technical scheme to make handle and treatment head connection more reliable stable.

Description

Technical Field

[0001] This utility model relates to the field of medical equipment technology, and in particular to a handheld device and a therapeutic instrument. Background Technology

[0002] In some therapeutic devices, the handheld component has a part that comes into contact with the skin, namely the treatment head. Treatment heads are often replaced frequently to change treatment parameters, and in some scenarios, the treatment head is a disposable consumable that needs to be frequently disassembled and replaced with the handheld component.

[0003] In most mainstream handheld devices, the handle and treatment head are connected by a screw thread. This screw thread connection achieves a tight fit through rotation, but with repeated use, the threaded portion of the screw thread is prone to wear. This wear gradually weakens the connection stability between the handle and treatment head, leading to loosening. Utility Model Content

[0004] The main purpose of this invention is to provide a handheld device and a treatment head that make the connection between the handle and the treatment head more reliable and stable.

[0005] To achieve the above objectives, the present invention proposes a handheld device, including a handle and a treatment head. The end of the handle facing the treatment head is provided with a connecting seat and an elastic element, and the connecting seat is provided with a buckle opposite to the elastic element.

[0006] The treatment head is provided with a clasp at the end facing the handle;

[0007] When the buckle is engaged with the rotary buckle, the elastic element elastically abuts against the rotary buckle, so that the rotary buckle is fastened at the buckle.

[0008] In one embodiment, the elastic element is provided with a gradient protrusion, the thickness of which gradually increases along the direction in which the buckle and the swivel buckle are connected.

[0009] In one embodiment, the elastic element is further provided with start protrusions and stop protrusions arranged at intervals, the start protrusions and the stop protrusions being located at both ends of the gradient protrusions, for defining the range of motion of the buckle.

[0010] In one embodiment, there are multiple fasteners and multiple screw fasteners, and each screw fastener is engaged with one of the fasteners.

[0011] In one embodiment, the elastic element is annular and is arranged around the periphery of the connecting seat, and the plurality of fasteners are arranged opposite to the elastic element.

[0012] In one embodiment, the connector is further provided with an opening, and the opening and the fastener are spaced apart on the connector along the direction of fastening connection;

[0013] The handheld component also includes a locking button that is rotatably connected to the opening, the locking button having a snap-fit ​​part; the swivel buckle is fastened to the buckle position and engages with the snap-fit ​​part.

[0014] In one embodiment, the locking button further includes a pressing portion exposed from the opening, the pressing portion being spaced apart from the locking portion for user contact and pressing.

[0015] In one embodiment, the handheld component further includes a torsion spring, the two ends of which are respectively connected to the locking button and the connecting seat, and the torsion spring is used to drive the locking button to elastically engage with the rotary buckle.

[0016] In one embodiment, the buckle includes a through hole and a limiting hole that is sequentially connected to the through hole. The swivel buckle passes through the through hole and is limited on the limiting hole to engage with the locking button.

[0017] This utility model also proposes a therapeutic device, the therapeutic device comprising:

[0018] Treatment host; and

[0019] The handheld device described above is connected to the instrument body.

[0020] The handheld component of this utility model includes a handle and a treatment head. A connecting seat is provided at the end of the handle facing the treatment head, and the connecting seat has a fastening position. At the same end of the handle facing the treatment head, a connecting seat and an elastic element are provided, and the connecting seat has a fastening position opposite to the elastic element. A rotary buckle is provided at the end of the treatment head facing the handle. When the fastening position and the rotary buckle are engaged, the elastic element elastically abuts against the rotary buckle, so that the rotary buckle is fastened at the fastening position. By providing a fastening position on the connecting seat that cooperates with the elastic element, and through the elastic abutment between the elastic element and the fastening position, a continuous fastening force is provided, maintaining the stability of the connection even after wear, thus making the connection between the handle and the treatment head more reliable and stable, avoiding loosening problems caused by long-term use. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0022] Figure 1 Exploded view of the structure of the therapeutic instrument provided by this utility model;

[0023] Figure 2 A schematic diagram of the structure of the therapeutic instrument provided by this utility model;

[0024] Figure 3 A partial cross-sectional view of the therapeutic instrument provided by this utility model;

[0025] Figure 4 A schematic diagram of the elastic component of the handheld part of the therapeutic instrument provided by this utility model.

[0026] Explanation of icon numbers:

[0027] 10. Connecting seat; 10a. Buckle; 101a. Through hole; 102a. Limiting hole; 10b. Opening; 20. Elastic element; 20a. Gradient protrusion; 20b. Starting protrusion; 20c. Stopping protrusion; 30. Locking button; 30a. Snap-fit ​​part; 30b. Pressing part; 40. Torsion spring; 2. Treatment head; 2a. Rotary buckle.

[0028] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0030] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0031] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0032] In existing technologies, the handle and treatment head of a therapeutic device are generally connected by a screw thread, which is used to secure the device. However, during frequent disassembly and assembly, the screw thread is prone to wear, leading to increased clearance and a significant decrease in connection stability. Clinical use has shown that after repeated disassembly and assembly more than a certain number of times, the treatment head will wobble, directly affecting treatment accuracy and, in severe cases, even causing the treatment head to detach.

[0033] To address the aforementioned issues, researchers discovered inherent flaws in mechanical locking relying solely on screw threads. Multiple experiments confirmed that localized stress concentration at the threaded contact surface was the root cause of accelerated wear. To resolve this, the design approach shifted from simple locking to composite locking, attempting to introduce an elastic compensation mechanism while retaining the screw thread structure. By analyzing the distribution of the mating clearance after wear, an elastic preload device was proposed to be installed in the engagement area. This device utilizes elastic deformation to compensate for wear, thereby maintaining the stability of the locking force.

[0034] Therefore, please refer to Figures 1 to 4 This application proposes a handheld device including a handle and a treatment head 2. A connecting seat 10 and an elastic element 20 are provided at the end of the handle facing the treatment head 2. The connecting seat 10 has a fastening position 10a opposite to the elastic element 20. A rotating buckle 2a is provided at the end of the treatment head 2 facing the handle. When the fastening position 10a and the rotating buckle 2a are engaged, the elastic element 20 elastically abuts against the rotating buckle 2a, so that the rotating buckle 2a is fastened at the fastening position 10a.

[0035] In this embodiment, the connecting seat 10 refers to the load-bearing structure located at the end of the handle, which can be implemented using a metal stamping part or an injection-molded part. It has an internal mounting space to accommodate the buckle 10a and the elastic element 20. The buckle 10a refers to the locking structure formed on the connecting seat 10, which can be implemented using a slot, a limiting hole 102a, or a protrusion, for mechanical interlocking with the rotary buckle 2a. The elastic element 20 refers to a component with elastic deformation capability, which can be implemented using a spring steel sheet, a silicone pad, or a disc spring. Its installation direction is aligned axially with the buckle 10a, and it can apply a continuous clamping force after the rotary buckle 2a is engaged. The rotary buckle 2a is a protrusion or claw at the end of the treatment head 2, which can be rotatably inserted into the buckle 10a.

[0036] When the snap fastener 2a engages with the locking position 10a, the elastic element 20 deforms under the pressure of the snap fastener 2a. The rebound force generated by this deformation acts on the snap fastener 2a along the engagement direction, ensuring it remains tightly against the inner wall of the locking position 10a. This elastic preload effectively compensates for gaps caused by thread wear; even if there is a slight gap between the snap fastener 2a and the locking position 10a, the continuous force of the elastic element 20 maintains close contact between them. Under axial load, the deformation of the elastic element 20 dynamically adjusts with changes in external force, creating an adaptive locking effect.

[0037] This application utilizes a locking position 10a on the connector 10 to engage with an elastic element 20. The elastic contact between the elastic element 20 and the locking position 10a provides a continuous locking force, maintaining connection stability even after wear. This ensures a more secure and stable connection between the handle and the treatment head 2, preventing loosening due to prolonged use. The dynamic compensation function of the elastic element 20 ensures that the screw thread 2a and the locking position 10a maintain effective contact at all times, preventing loosening caused by wear. This dual locking mechanism not only improves connection reliability but also reduces local stress on the threads of the screw thread 2a, slowing down the wear process. It is particularly suitable for clinical applications requiring frequent replacement of the treatment head 2.

[0038] In another specific embodiment, the buckle 10a and the rotary buckle 2a can be designed as a magnetically assisted locking structure.

[0039] Please see Figure 1 and Figure 4 This application further proposes that the elastic element 20 is provided with a gradient protrusion 20a, the thickness of which gradually increases along the direction of the fastening connection between the buckle 10a and the swivel buckle 2a.

[0040] In this embodiment, the gradient protrusion 20a refers to a protrusion structure formed on the surface of the elastic element 20 whose thickness continuously varies along the direction of the fastening connection between the buckle 10a and the snap fastener 2a. Specifically, it can be implemented using a ramp-type or wedge-shaped structure. The thickness of the protrusion increases from the starting end to the ending end. During the process of the snap fastener 2a and the buckle 10a fastening each other, the gradient protrusion 20a causes the elastic element 20 to produce gradient elastic deformation in the fastening direction through the change in thickness.

[0041] Specifically, when the snap fastener 2a and the locking position 10a are rotated into place, the snap fastener 2a contacts the starting end of the gradient protrusion 20a. At this time, the elastic element 20 has a small deformation, providing a low elastic resistance force, which facilitates the smooth entry of the snap fastener 2a into the locking position 10a. As the snap fastener 2a continues to rotate and move in the fastening direction, it gradually contacts the thicker area of ​​the gradient protrusion 20a, and the deformation of the elastic element 20 increases accordingly, gradually strengthening the elastic resistance force. When the fastening is complete, the snap fastener 2a is positioned at the thickest area of ​​the gradient protrusion 20a. At this time, the maximum resistance force generated by the elastic element 20 forms a stable interference fit between the snap fastener 2a and the locking position 10a. Even if the snap fastener 2a wears down due to long-term use, the continuous resistance force of the elastic element 20 can still fill the gap and prevent the connection from loosening.

[0042] This application provides a gradient protrusion 20a, which continuously provides an elastic abutment force matching the degree of wear after the screw 2a and the buckle 10a are engaged, thus avoiding loosening of the connection due to thread wear and improving the reliability of the connection between the treatment head 2 and the handle.

[0043] Please see Figure 1 and Figure 4 This application further proposes that the elastic member 20 is provided with start protrusions 20b and stop protrusions 20c arranged at intervals, the start protrusions 20b and stop protrusions 20c are located at both ends of the gradient protrusions 20a, and are used to limit the range of motion of the buckle 2a.

[0044] In this embodiment, the starting protrusion 20b refers to a local protrusion structure located at the starting end of the gradient protrusion 20a. Specifically, it can be implemented using an arc-shaped protrusion or a stepped boss, and is used to prevent the buckle 2a from continuing to rotate in the reverse direction before reaching the preset position. The stopping protrusion 20c refers to a local protrusion structure located at the ending end of the gradient protrusion 20a. Specifically, it can be implemented using a ramp-shaped protrusion or a groove limiting structure, and is used to prevent the buckle 2a from continuing to rotate forward after reaching the engagement endpoint. The spaced arrangement of the starting protrusion 20b and the stopping protrusion 20c forms a physical limit on the rotation angle of the buckle 2a, and the spacing can be adaptively adjusted according to the rotation stroke of the buckle 2a.

[0045] Specifically, when the snap fastener 2a rotates in the fastening direction, its side first contacts the initiating protrusion 20b. At this time, the initiating protrusion 20b prevents the snap fastener 2a from retracting in the opposite direction through rigid contact, ensuring that the snap fastener 2a enters the effective working area of ​​the gradient protrusion 20a. As the snap fastener 2a continues to rotate forward, the thickness change of the gradient protrusion 20a provides elastic resistance to the snap fastener 2a. At the same time, the snap fastener 2a slides along the surface of the gradient protrusion 20a until it contacts the stopping protrusion 20c. The stopping protrusion 20c limits the final rotation position of the snap fastener 2a through mechanical blocking, preventing the snap fastener 2a from exceeding the elastic compensation range of the elastic element 20. Through the synergistic effect of the initiating protrusion 20b and the stopping protrusion 20c, the rotation angle of the snap fastener 2a is strictly limited within the thickness change range of the gradient protrusion 20a, so that the elastic element 20 is always within the effective elastic deformation range.

[0046] This solution integrates an initiation protrusion 20b and a stop protrusion 20c on the elastic element 20 to form a double-end mechanical limiting structure, ensuring that the elastic element 20 is always within the effective elastic deformation range of the gradual protrusion 20a, thereby maintaining a stable connection between the handle and the treatment head 2, extending the service life of the handpiece, and eliminating the risk of overtravel movement of the buckle 2a while retaining the elastic self-adjustment function.

[0047] Please see Figure 1 and Figure 2 This application further proposes that there are multiple fasteners 10a and multiple screw fasteners 2a, with each screw fastener 2a being fastened to a fastener 10a.

[0048] In this embodiment, the latch 10a refers to multiple grooves or snap-fit ​​structures provided on the handle connector 10, which can be implemented using flanges arranged in a ring array. Each latch 10a independently corresponds to a snap 2a. The snap 2a refers to multiple protrusions or snap-fit ​​structures at the end of the treatment head 2, which can be implemented using hook-shaped or arc-shaped protrusions that match the shape of the latch 10a. Each snap 2a forms a point-to-point engagement with the corresponding latch 10a. By setting multiple independent engagement units in parallel, external force is distributed to each engagement point, avoiding wear caused by stress concentration at a single connection point.

[0049] Specifically, the connecting seat 10 has multiple circumferentially distributed fasteners 10a, and the treatment head 2 has the same number of corresponding screw fasteners 2a. When the treatment head 2 is connected to the handle, each screw fastener 2a is embedded in its corresponding fastener 10a, forming multiple independent fastening structures. During the rotation and locking process, each screw fastener 2a and the fastener 10a are subjected to force synchronously, so that the overall connection load is evenly distributed. If one fastening unit wears out due to long-term use, the remaining fastening units can still maintain an effective connection, preventing loosening between the treatment head 2 and the handle.

[0050] This design reduces localized stress by using multiple snap fasteners 10a to bear loads in parallel, extending the service life of the fastening structure and ensuring that the connection between the treatment head 2 and the handle remains reliably fixed even after some snap fasteners 10a have worn down. Distributing the load across multiple contact points significantly reduces the stress on individual snap fasteners 10a, while the redundant connection structure enhances overall stability.

[0051] Please see Figure 1 and Figure 4 This application further proposes that the elastic element 20 is annular, and the elastic element 20 is arranged around the periphery of the connecting seat 10, and multiple fasteners 10a are arranged opposite to the elastic element 20.

[0052] In this embodiment, the elastic element 20 refers to a thin, elastic metal sheet with a ring-shaped structure, which can be stamped from copper or stainless steel. Its ring structure can form a continuous support surface along the outer wall of the connecting seat 10. "Circumferential arrangement" means that the elastic element 20 completely wraps around the circumference of the connecting seat 10. Specifically, this can be achieved by creating an annular groove on the outer wall of the connecting seat 10 for positioning and installation. This structure allows the elastic element 20 to exert a uniform force on the circumferentially distributed fasteners 10a. "Fasteners 10a and elastic element 20 are arranged opposite each other" means that the distribution positions of multiple fasteners 10a on the circumference of the connecting seat 10 all correspond to the annular support area of ​​the elastic element 20. Specifically, this can be achieved by arranging each fastener 10a at equal angles along the circumference of the connecting seat 10, ensuring that each fastener 10a receives the same elastic support conditions.

[0053] Specifically, when the treatment head 2 is assembled with the screw fastener 2a and the fastener 10a, the continuous circumferential elasticity of the annular elastic element 20 ensures that the pressure borne by each fastener 10a is evenly distributed. Since the annular support of the annular elastic element 20 covers the working area of ​​all fasteners 10a, the radial force generated during the rotation of the screw fastener 2a is absorbed by the circumferential deformation of the annular elastic element 20, preventing local stress concentration that could lead to elastic failure. When the treatment head 2 is subjected to lateral torsion, the annular elastic element 20 applies complementary reaction forces to each fastener 10a through the continuity of its annular structure, forming a multi-directional balance constraint and preventing displacement of a single fastener 10a due to overload.

[0054] The annular spring sheet used in this solution achieves synchronous elastic compensation for multiple snap positions 10a through a circumferential wrapping structure, ensuring that all snap positions 10a always receive uniform contact pressure during the assembly of the snap 2a, thus eliminating the problem of local wear caused by uneven elastic support.

[0055] In another embodiment, the annular elastic element 20 can be replaced by a split spring array, each corresponding independently to a latch 10a.

[0056] Please see Figure 1 and Figure 2This application further proposes to provide an opening 10b on the connecting seat 10, with the opening 10b and the buckle 10a spaced apart along the fastening connection direction, and to rotate the connecting locking button 30 at the opening 10b, the locking button 30 having a locking part 30a; when the screw buckle 2a is fastened to the buckle 10a, it engages with the locking part 30a.

[0057] In this embodiment, opening 10b refers to the pre-reserved assembly cavity on the connecting seat 10, which can be implemented as a rectangular or circular through hole. It maintains an axial distance from the latch 10a, providing an independent installation area for the locking button 30 and avoiding spatial interference with the latching action of the latch 10a. Locking button 30 refers to a mechanical component with a rotation function, which can be made of metal or plastic to form a hinge structure. The position state of the locking part 30a is switched by rotation. Locking part 30a refers to the protruding structure on the locking button 30 for mechanically engaging with the swivel 2a. It can be implemented as a barb or a wedge block. When the locking button 30 rotates to a predetermined angle, locking part 30a can restrict the axial displacement of the swivel 2a.

[0058] Specifically, after the snap fastener 2a completes its initial engagement with the snap-fit ​​position 10a, the locking button 30 is operated to rotate it around the axis of the opening 10b. At this time, the engaging part 30a moves from its initial position to contact the surface of the snap fastener 2a. When the locking button 30 is rotated to its final position, the engaging part 30a embeds into the recessed area of ​​the side wall of the snap fastener 2a or directly abuts against the end face of the snap fastener 2a, forming a second mechanical constraint. During this process, the spaced layout of the openings 10b ensures that the movement trajectory of the locking button 30 does not interfere with the normal engagement action of the snap-fit ​​position 10a. At the same time, the rotational freedom of the locking button 30 allows it to adapt to snap fasteners 2a with different degrees of wear, and the effective engaging force is maintained by adjusting the contact depth of the engaging part 30a.

[0059] Compared to existing technologies, the current rotary buckle 2a connection relies solely on thread friction to prevent loosening. This solution, however, adds a rotatable locking button 30, superimposing a mechanical stop on the locking part 30a on top of the engagement of the buckle 10a, forming a double-locking structure. This design ensures that even if the thread friction of the rotary buckle 2a decreases due to wear, the locking part 30a can still prevent the rotary buckle 2a from axially retracting through rigid contact, thus compensating for the reliability deficiencies of a single engagement structure.

[0060] Please see Figure 1 and Figure 2 This application further proposes that the locking button 30 also has a pressing part 30b exposed from the opening 10b, the pressing part 30b being spaced apart from the locking part 30a, for the user to contact and press.

[0061] In this embodiment, the pressing part 30b refers to the area on the locking button 30 that can be pressed by a finger. Specifically, it can be implemented using a protruding structure with an anti-slip texture, such as a square or arc-shaped protrusion. The exposed design of the pressing part 30b allows it to be directly exposed to the external environment through the opening 10b, facilitating user finger contact. The spacing setting refers to maintaining a physical separation between the pressing part 30b and the locking part 30a. This can be achieved by providing an insulating rib or a dividing groove inside the locking button 30. This spacing structure ensures that the movement trajectories of the pressing part 30b and the locking part 30a are independent.

[0062] Specifically, when the user needs to release the lock, they can directly press the exposed pressing part 30b with their finger. Because the pressing part 30b and the locking part 30a are spaced apart, the force applied to the pressing part 30b is transmitted to the rotation fulcrum of the locking button 30 via a lever principle, causing the locking part 30a to disengage from the latch 2a. During this process, the spacing avoids direct interference of the pressing action with the position of the locking part 30a, ensuring that the locking part 30a moves only along a predetermined trajectory. For example, when the pressing part 30b is pressed down, the locking button 30 rotates around the pivot at the opening 10b, and the locking part 30a moves along a path perpendicular to the pressing direction, disengaging from the latch 2a. This design makes one-handed operation possible, allowing the user to complete the unlocking action without adjusting their grip.

[0063] This solution eliminates lateral interference to the locking part 30a when the finger applies force by using exposed and spaced-apart pressing parts 30b, while also expanding the accessible area.

[0064] Please see Figure 1 and Figure 2 This application further proposes that the handheld component also includes a torsion spring 40, the two ends of which are connected to the locking button 30 and the connecting seat 10 respectively. The torsion spring 40 is used to drive the locking button 30 to elastically engage with the swivel 2a.

[0065] In this embodiment, the torsion spring 40 is a mechanical element that generates elastic restoring force through torsion. Specifically, it can be implemented using a helical spring structure. Its two ends are respectively fixed to the corresponding mounting positions of the locking button 30 and the connecting seat 10, and the initial position of the locking button 30 is maintained by the preload. The locking button 30 is a mechanical component used to lock the position 10a of the latch 2a. Specifically, it can be implemented using a press-type structure that is rotatably connected to the opening 10b of the connecting seat 10, and its locking part 30a forms an engaging relationship with the latch 2a.

[0066] Specifically, the locking button 30 is rotatably connected to the opening 10b of the connecting seat 10, and the two ends of the torsion spring 40 are respectively fixed between the locking button 30 and the connecting seat 10. When the locking button 30 is not pressed, the elastic restoring force of the torsion spring 40 drives the locking button 30's locking part 30a to remain engaged with the knob 2a, thus stably restricting the knob 2a within the latching position 10a. When the user presses the pressing part 30b of the locking button 30, the locking button 30 rotates around the connecting seat 10. At this time, the torsion spring 40 accumulates elastic potential energy due to the torsion, and the locking part 30a disengages from the knob 2a, allowing the knob 2a to adjust its position within the latching position 10a. After releasing the pressure, the torsion spring 40 releases its elastic potential energy and drives the locking button 30 to reset, and the locking part 30a re-engages with the knob 2a. This process compensates for the elastic decay of the locking button 30 after long-term use by the elastic deformation of the torsion spring 40, ensuring the stability of the locking state.

[0067] This design uses an independently designed torsion spring 40 as an elastic drive source. The elastic restoring force of the torsion spring 40 continuously maintains the locking button 30 and the buckle 2a in a locked state, ensuring that the connection stability between the treatment head 2 and the handle remains unaffected during long-term use. At the same time, the installation method of the torsion spring 40 simplifies the structural complexity of the locking button 30.

[0068] The torsion spring 40 can be replaced with a tension spring or a magnetic reset structure; the snap-fit ​​part 30a can be designed as a slider type instead of a rotary type.

[0069] Please see Figure 1 and Figure 2 This application further proposes that the buckle 10a includes a through hole 101a and a limiting hole 102a connected in sequence with the through hole 101a, and the swivel buckle 2a passes through the through hole 101a and is limited on the limiting hole 102a and engages with the locking button 30.

[0070] In this embodiment, the through hole 101a refers to the channel provided on the connecting seat 10 for guiding the initial insertion of the snap fastener 2a. Specifically, it can be implemented as a circular through hole or a rectangular opening 10b. When inserted, the snap fastener 2a is guided into the buckle position 10a along the axial direction of the through hole 101a. The limiting hole 102a refers to a constraint structure that communicates with the through hole 101a and is larger in size than the through hole 101a. Specifically, it can be implemented as an enlarged section or a stepped groove. When the snap fastener 2a moves to the limiting hole 102a, its radial range of movement is restricted to avoid lateral displacement. The locking part 30a of the locking button 30 refers to a protrusion or groove that matches the surface shape of the snap fastener 2a. Specifically, it can be implemented as a beveled claw or a hook-like structure. When the snap fastener 2a is positioned in the limiting hole 102a, the locking part 30a and the snap fastener 2a form an interlocking relationship.

[0071] Specifically, after the snap fastener 2a is inserted into the through hole 101a, it moves along the extension direction of the through hole 101a until it enters the limiting hole 102a. The width of the limiting hole 102a is greater than the diameter of the through hole 101a, so that the displacement of the snap fastener 2a within the limiting hole 102a is limited to a preset range. At this time, the locking part 30a of the locking button 30 contacts the end or side wall of the snap fastener 2a, forming a secondary fixation through mechanical locking. The snap fastener 2a cannot be withdrawn from the through hole 101a in reverse because the edge of the limiting hole 102a forms a blockage; at the same time, due to the interlocking effect between the locking part 30a of the locking button 30 and the snap fastener 2a, axial or radial displacement caused by external force is suppressed.

[0072] In some specific embodiments, the locking part 30a of the locking button 30 can be designed as a claw with an inclined angle. When the buckle 2a enters the limiting hole 102a, the claw automatically engages in the groove on the surface of the buckle 2a under the action of the elastic member 20.

[0073] Compared with existing technologies, traditional rotary buckle 2a connections rely solely on the friction of the thread or a single snap-fit ​​10a for fixation, making them prone to loosening due to vibration or wear. This solution extends the displacement constraint of the rotary buckle 2a from a single dimension to a multi-dimensional constraint through a dual locking mechanism of the limiting hole 102a and the locking button 30. At the same time, it introduces a mechanical interlocking structure, significantly improving the resistance to loosening.

[0074] Please see Figure 1 and Figure 2 This application further proposes that the treatment device includes a treatment host and a handheld device, with the handheld device connected to the treatment host.

[0075] In this embodiment, the treatment host refers to the device used to control treatment parameters and provide treatment energy. Specifically, it can be implemented using the host structure of an electrotherapy device or a phototherapy device. It is connected to the handheld device via wires or wirelessly to transmit energy signals to the treatment head 2. The handheld device refers to the operating component including a handle and the treatment head 2. Specifically, it is implemented by the connecting seat 10 of the handle and the buckle 2a of the treatment head 2. The end of the handle facing the treatment head 2 is provided with a connecting seat 10 with a buckle 10a, and the end of the treatment head 2 facing the handle is provided with a buckle 2a. An elastic member 20 is disposed opposite to the buckle 10a and elastically abuts against the buckle 2a. The elastic force drives the buckle 2a to be fastened at the buckle 10a.

[0076] Specifically, the therapeutic device achieves its therapeutic function through a combination of a handheld component and the main treatment unit. The handle and treatment head 2 are connected by a snap fastener 10a and a rotary buckle 2a. An elastic element 20 continuously applies elastic force to keep the rotary buckle 2a in close contact with the snap fastener 10a. When the rotary buckle 2a wears down due to frequent use, the elastic abutment of the elastic element 20 can automatically compensate for the wear gap and maintain the stability of the fastening state. At the same time, the non-threaded design of the snap fastener 10a and the rotary buckle 2a avoids the wear problem of traditional threaded connections. Combined with the elastic element 20, locking button 30, and other structures, the connection reliability is further optimized, achieving the dual effects of quick assembly and disassembly and preventing loosening.

[0077] Compared to existing technologies, traditional therapeutic devices use threaded connections for the handheld parts, which can lead to loosening due to thread wear after prolonged use. This solution employs a snap-fit ​​connection between latch 10a and screw 2a, combined with continuous pressure from the elastic element 20, eliminating the need for threaded structures and fundamentally removing the risk of thread wear. The dynamic compensation mechanism of the elastic element 20 automatically adjusts the tightness of the snap-fit ​​when wear occurs, significantly extending service life and maintaining connection stability compared to traditional fixed connection structures.

[0078] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A handheld device, characterized in that, It includes a handle and a treatment head (2). The end of the handle facing the treatment head (2) is provided with a connecting seat (10) and an elastic member (20). The connecting seat (10) is provided with a buckle (10a) opposite to the elastic member (20). The treatment head (2) is provided with a swivel at one end facing the handle; When the buckle (10a) is fastened to the swivel (2a), the elastic element (20) elastically abuts against the swivel (2a) so that the swivel (2a) is fastened to the buckle (10a).

2. The handheld device as described in claim 1, characterized in that, The elastic element (20) is provided with a gradient protrusion (20a), the thickness of which gradually increases along the direction in which the buckle (10a) and the swivel buckle (2a) are fastened together.

3. The handheld device as described in claim 2, characterized in that, The elastic element (20) is further provided with start protrusions (20b) and stop protrusions (20c) arranged at intervals. The start protrusions (20b) and the stop protrusions (20c) are located at both ends of the gradient protrusions (20a) and are used to limit the range of motion of the buckle (2a).

4. The handheld device as described in claim 1, characterized in that, The number of the buckle (10a) and the number of the screw buckle (2a) are both multiple, and each screw buckle (2a) is fastened to one of the buckle (10a).

5. The handheld device as described in claim 4, characterized in that, The elastic element (20) is annular and is arranged around the periphery of the connecting seat (10). The plurality of fasteners (10a) are arranged opposite to the elastic element (20).

6. The handheld device as described in claim 1, characterized in that, The connecting seat (10) is also provided with an opening (10b), and the opening (10b) and the fastener (10a) are spaced apart on the connecting seat (10) along the direction of fastening connection; The handheld device also includes a locking button (30) rotatably connected to the opening (10b), the locking button (30) having a snap-fit ​​part (30a); the swivel buckle (2a) is fastened to the buckle (10a) and snapped into the snap-fit ​​part (30a).

7. The handheld device as described in claim 6, characterized in that, The locking button (30) also has a pressing part (30b) exposed from the opening (10b), the pressing part (30b) being spaced apart from the locking part (30a) for the user to contact and press.

8. The handheld device as described in claim 7, characterized in that, The handheld component also includes a torsion spring (40), the two ends of which are connected to the locking button (30) and the connecting seat (10) respectively. The torsion spring (40) is used to drive the locking button (30) to elastically engage with the throttle (2a).

9. The handheld device as described in claim 6, characterized in that, The buckle (10a) includes a through hole (101a) and a limiting hole (102a) that is sequentially connected to the through hole (101a). The swivel buckle (2a) passes through the through hole (101a) and is limited on the limiting hole (102a) to engage with the locking button (30).

10. A therapeutic device, characterized in that, The therapeutic device includes: Treatment host; and The handheld device as described in any one of claims 1 to 9, wherein the handheld device is connected to the instrument body.

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