Medical power handle

Abstract

The utility model relates to a medical power handle which comprises a shell, a power assembly, a magnetic sensitive element and a key assembly, the power assembly and the magnetic sensitive element are both arranged in the shell, the magnetic sensitive element is electrically connected to the power assembly, the key assembly is provided with a key and a magnet which are connected, the key is directly or indirectly arranged on the shell, and the magnet is electrically connected to the magnetic sensitive element. When the key moves relative to the shell, the magneto-sensitive element generates a trigger signal for changing the output state of the power assembly, so that the key does not need to be in contact with the magneto-sensitive element, and therefore, the key can be operated to move relative to the shell to be close to or far away from the magneto-sensitive element. Even if the handle is used for a long time, dust or other smudginess is mixed in the key due to abrasion of parts such as a sealing piece and the like, so that the movement of the key is slightly lagged, the pressing function of the key is not influenced, and only the key can be close to the magnetic sensitive element; therefore, the problem of insensitive handle control and even control failure caused by the fact that a traditional mechanical key cannot be effectively contacted with a circuit control board is solved.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a medical power handpiece. Background Technology

[0002] In surgical procedures involving the removal of bone or soft tissue, high-speed cutting tools perform cutting operations on diseased bone tissue through planing and grinding. Because the cutting tools need to be driven to rotate at high speed and have a certain degree of operability, a power handle is required to drive the cutting tools to perform the cutting action.

[0003] To facilitate operation by doctors, medical powered handles compatible with surgical instruments are typically equipped with buttons, allowing doctors to control start / stop, speed increase, and deceleration. However, most existing medical powered handles use a mechanically triggered button structure, meaning the button must contact the circuit control board inside the handle to trigger a change in the handle's output state. This presents a problem: after prolonged use, the mechanically triggered button structure may become sticky due to wear and tear on seals and other parts, accumulating dust or other contaminants. In severe cases, this can even lead to the button failing to make effective contact with the circuit control board, resulting in unresponsive or even malfunctioning handle control. Utility Model Content

[0004] Therefore, it is necessary to provide a medical powered handpiece that can solve the problem of unresponsive or even malfunctioning control caused by the mechanical trigger button structure of existing medical powered handpieces.

[0005] According to one aspect of this application, a medical power handpiece is provided, comprising:

[0006] shell;

[0007] A power assembly, located within the housing, is used to connect to the cutting tool and to drive the cutting tool to perform cutting actions.

[0008] A magnetic sensitive element is disposed inside the housing and is electrically connected to the power assembly;

[0009] A button assembly has a connected button or magnet, the button being directly or indirectly disposed on the housing and operable to move relative to the housing to approach the magnetic sensitive element and automatically reset; when the button approaches the magnetic sensitive element, the magnetic sensitive element generates a trigger signal that changes the output state of the power assembly.

[0010] In one embodiment, the medical power handle further includes a circuit board disposed within the housing and electrically connected to the power assembly, the magnetic sensitive element being integrated on the circuit board, and the circuit board being sealed and isolated from the button assembly.

[0011] In one embodiment, the housing and the button assembly form a receiving cavity, and an elastic element is provided in the receiving cavity. One end of the elastic element directly or indirectly abuts against the button, and the other end of the elastic element directly or indirectly abuts against the cavity wall of the receiving cavity, so as to provide an elastic force to reset the button after the button approaches the magnetic sensitive element.

[0012] In one embodiment, the button assembly further includes a positioning member disposed within the receiving cavity, and the opposite ends of the elastic element abut against the positioning member and the button, respectively;

[0013] The magnetic sensitive element is also disposed within the mounting cavity, the button and the elastic element are disposed on one side of the positioning member, and the magnetic sensitive element is disposed on the other side of the positioning member.

[0014] In one embodiment, the receiving cavity includes a mounting cavity formed on the outer wall of the housing, the positioning member and the cavity wall of the mounting cavity form a potting chamber, the magnetic sensitive element is integrated on the circuit board, the circuit board is disposed in the potting chamber, and the potting chamber is filled with a sealing adhesive covering the circuit board.

[0015] In one embodiment, the potting chamber has a cavity bottom surface facing the positioning member, the magnetic sensitive element protrudes relative to the circuit board, the circuit board is attached to the cavity bottom surface, and the magnetic sensitive element is attached to the positioning member.

[0016] In one embodiment, the receiving cavity includes a mounting cavity formed on the outer wall of the housing, the sidewall of the receiving cavity having a stepped surface facing the button, and the elastic element pressing the positioning member against the stepped surface.

[0017] In one embodiment, the button assembly includes a button panel, the button being movably inserted into a button hole in the button panel, the button panel forming part of the cavity wall of the receiving cavity, and the elastic element providing an elastic force that causes the button to abut against the button panel after reset.

[0018] In one embodiment, the button panel has a limiting pin on the side facing the receiving cavity, and the end of the limiting pin away from the button panel abuts against the positioning member; and / or, the button includes a flange of the button body located on the outer edge of the button body, the flange being used to abut against the button panel when the button is reset.

[0019] In one embodiment, the button has a magnet seat on the side facing the receiving cavity, and the elastic element presses the magnet seat against the button by abutting against the magnet seat, the magnet being disposed within the magnet seat.

[0020] In one embodiment, the button assembly includes one button; or, the button assembly includes multiple buttons, each button being connected to a magnet, and multiple magnetic sensitive elements are correspondingly provided, with each button being disposed opposite to a corresponding magnetic sensitive element.

[0021] The aforementioned medical powered handpiece features a button assembly with a movable button relative to the outer shell. A magnet is connected to the button, and a magnetic sensitive element is located inside the shell, capable of magnetic induction with the magnet. When the button approaches the magnetic sensitive element, the magnet and the magnetic sensitive element can induce a magnetic induction, allowing the magnetic sensitive element to generate a trigger signal that changes the output state of the power assembly without the button needing to contact the magnetic sensitive element. Thus, even if the handpiece experiences slight sluggishness due to wear and tear on seals and other parts causing dust or other dirt to accumulate on the button after prolonged use, the button's pressing function remains unaffected, as long as the button can approach the magnetic sensitive element. This solves the problem of traditional mechanical buttons failing to effectively contact the circuit control board, leading to unresponsive or even malfunctioning handpiece control. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the appearance of a medical power handle provided in one embodiment of this application.

[0023] Figure 2 for Figure 1 Sectional view along the AA direction.

[0024] Figure 3 for Figure 2 A magnified view of region B in the middle.

[0025] Figure 4 for Figure 3 A magnified view of region C in the middle.

[0026] Explanation of reference numerals in the attached figures:

[0027] 10. Medical powered handle; 11. Receiving cavity; 100. Outer shell; 101. Mounting cavity; 103. Glue filling chamber; 102. Stepped surface; 200. Power assembly; 300. Circuit board; 310. Magnetic sensitive element; 400. Button assembly; 410. Button; 411. Button body; 412. Flange; 420. Magnet; 430. Elastic element; 440. Button panel; 450. Magnet base; 460. Positioning component; 470. Limiting pin. Detailed Implementation

[0028] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0029] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0030] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0031] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0032] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0033] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0034] This application provides a medical power handle for connecting a cutting tool to perform high-speed planing, grinding, or other cutting operations on diseased bone tissue during surgical bone or soft tissue resection.

[0035] The structure of the medical power handle provided in this application will be described below using the example of a joint planer handle used for planing soft tissues of joints. It is understood that the medical power handle provided in this application is not limited to a joint planer handle; it can also be a grinding handle, a milling handle, or a power handle for other cutting methods, which are not limited here.

[0036] See Figure 1 and Figure 2 , Figure 1 This paper shows a schematic diagram of the appearance of a medical power handle 10 according to one embodiment of the present application. Figure 2 for Figure 1A cross-sectional view along line AA. An embodiment of this application provides a medical power handle 10, including a housing 100, a power assembly 200, a magnetic sensitive element 310, and a button assembly 400. The power assembly 200 and the magnetic sensitive element 310 are disposed within the housing 100, and the button assembly 400 is disposed on the housing 100. The power assembly 200 is used to connect to a cutting tool for performing surgical operations. The magnetic sensitive element 310 is electrically connected to the power assembly 200. The button assembly 400 is operable to be connected or disconnected from the magnetic sensitive element 310, so that the output state of the power assembly 200 can be changed through the magnetic sensitive element 310, such as controlling the start / stop of the power assembly 200 or controlling the acceleration / deceleration of the motion component, thereby enabling the medical power handle 10 to drive the cutting tool to perform cutting actions.

[0037] In the embodiments of this application, combined with Figure 2 and Figure 3 As shown, the button assembly 400 has a button 410 and a magnet 420 connected to each other. The button 410 is directly or indirectly disposed on the housing 100 and is operable to move relative to the housing 100 to approach the magnetic sensitive element 310 and automatically reset. When the button 410 moves relative to the housing 100, that is, when the button 410 approaches the magnetic sensitive element 310, the magnet 420 can generate magnetic induction with the magnetic sensitive element 310, thereby causing the magnetic sensitive element 310 to generate a trigger signal that changes the output state of the power assembly 200.

[0038] With the above settings, button 410 can trigger the magnetic sensitive element 310 to change the output state of the power component 200 without contacting the magnetic sensitive element 310. Even if the button 410 is slightly stuck due to dust or other dirt caused by wear of parts such as seals after long-term use, it will not affect the pressing function of button 410, as long as button 410 can be close to magnetic sensitive element 310. This solves the problem that traditional mechanical buttons 410 cannot effectively contact the circuit control board, resulting in unresponsive or even malfunctioning control of the handle.

[0039] See Figure 3 In one embodiment, the housing 100 and the button assembly 400 form a receiving cavity 11. An elastic element 430 is provided within the receiving cavity 11. One end of the elastic element 430 directly or indirectly abuts against the button 410, and the other end directly or indirectly abuts against the cavity wall of the receiving cavity 11, providing an elastic force to reset the button 410 when it approaches the magnetic sensitive element 310. It is understood that the elastic element 430 can be any element capable of elastic deformation under external force, such as a spring, tension spring, or sheet spring, etc., without specific limitations.

[0040] exist Figure 3In the illustrated embodiment, the button assembly 400 includes a button panel 440 with button holes extending through opposite sides. A button 410 is movably inserted into the button hole of the button panel 440. The button panel 440 forms part of the cavity wall of the receiving cavity 11. When the doctor presses the button 410, the button 410 moves relative to the outer shell 100 towards the magnetic sensitive element 310, compressing the elastic element 430 and generating an elastic force. When the doctor releases the button 410, the elastic element 430 returns to its original shape under the action of the elastic force.

[0041] Thus, button 410 is an independent component that can move independently. Compared to the structure of traditional silicone buttons 410, button 410 does not have silicone material around it for tension, which makes the button 410 feel better to press and will not affect the button 410's reset due to damage to the silicone material.

[0042] Furthermore, in one embodiment, such as Figure 3 As shown, the receiving cavity 11 includes a mounting cavity 101, which is formed on the outer wall of the housing 100. The magnetic sensitive element 310 is disposed in the mounting cavity 101. The button panel 440 is a flat structure, and its side facing the magnetic sensitive element 310 is constructed as the top wall of the receiving cavity 11, thus forming the receiving cavity 11 together with the cavity wall of the mounting cavity 101. This allows for a reduction in the size of the handle and makes the handle more aesthetically pleasing. Of course, the structure of the receiving cavity 11 is not limited to the structure of the embodiment shown in the figure. In other embodiments, the button panel 440 may not be a flat structure, but a shell structure with an opening on one side. The cavity wall formed inside the shell 440 and the outer wall of the housing 100 together form the receiving cavity 11. Alternatively, the housing 100 may still have a mounting cavity 101, and the cavity wall formed inside the shell 440 and the cavity wall of the mounting cavity 101 together form the receiving cavity 11.

[0043] Furthermore, regarding the structure of button 410, such as Figure 4 As shown, button 410 includes a columnar button body 411 and a flange 412 disposed on the outer edge of button body 411. The flange 412 is used to abut against button panel 440 when button 410 is reset. It can be understood that the flange 412 can be annularly surrounding button body 411, or at least two flanges 412 can be spaced apart along the circumference of button body 411, as long as they can abut against button panel 440.

[0044] When the elastic force provided by the elastic element 430 resets the button 410, the flange 412 can abut against the button panel 440, thereby limiting the button 410 from continuing to move along the key. Figure 4The upward movement shown in the diagram allows button 410 to remain coaxially positioned within the button hole of button panel 440, ensuring that button 410 can still move freely within the button hole when pressed again. Figure 4 The vertical movement shown in the figure prevents the button 410 from dislodging from the button hole and deviating from the central axis of the button hole due to excessive elastic force generated by the elastic element 430. This also prevents the button 410 from being accurately pressed into the button hole when pressed again.

[0045] In the specific connection structure between the elastic element 430 and the button 410, Figure 4 In the embodiment shown, the button 410 has a hollow structure, and a magnet seat 450 is provided on the side facing the receiving cavity 11. The magnet 420 is disposed in the magnet seat 450. One end of the elastic element 430 abuts against the magnet seat 450, so that the elastic element 430 indirectly abuts against the button 410 through the magnet seat 450. The elastic force generated by the elastic element 430 itself presses the magnet seat 450 onto the button 410, so that the magnet 420 can be fixedly installed in the magnet seat 450 and prevent the magnet 420 from detaching from the magnet seat 450.

[0046] In other embodiments, the magnet 420 can also be directly embedded in the button 410, and the elastic element 430 can be directly connected to the button 410. However, by setting the magnet base 450 and by setting the elastic element 430 to abut against the magnet base 450, it is convenient to install the magnet 420 on the button 410, and there is no need to add a complicated processing process to embed the magnet 420 in the button 410, which helps to save production and manufacturing costs.

[0047] Regarding the connection method between the elastic element 430 and the cavity wall of the receiving cavity 11, such as... Figure 3 and Figure 4 As shown, the button assembly 400 also includes a positioning member 460 disposed within the receiving cavity 11. In the embodiment shown, the positioning member 460 has a flat plate structure. The opposite ends of the elastic element 430 abut against the positioning member 460 and the button 410, respectively. The button 410 and the elastic element 430 are disposed on one side of the positioning member 460 along its own thickness direction, and the magnetic sensitive element 310 is disposed on the opposite side of the positioning member 460 along its own thickness direction, so that one end of the elastic element 430 indirectly abuts against the cavity wall of the receiving cavity 11 through the positioning member 460. The function of the positioning member 460 is to allow the elastic element 430 to abut against the positioning member 460, so that the positioning member 460 abuts against the magnetic sensitive element 310, thereby firmly positioning the magnetic sensitive element 310 in the mounting cavity 101 and preventing the magnetic sensitive element 310 from moving freely.

[0048] In a preferred embodiment, such as Figure 4As shown, the sidewall of the mounting cavity 101 has a stepped surface 102 facing the button 410. One end of the elastic element 430 presses the positioning member 460 against the stepped surface 102, thereby firmly fixing the positioning member 460 in the mounting cavity 101. Optionally, the stepped surface 102 surrounds the mounting cavity 101 circumferentially, or there are several stepped surfaces 102, all of which are spaced apart circumferentially around the mounting cavity 101. No particular limitation is imposed on the above.

[0049] It is understood that in other embodiments, the end of the elastic element 430 away from the button 410 can also be directly connected to the cavity wall of the receiving cavity 11, and is not limited to being connected to the positioning member 460, as long as it can be ensured that the elastic element 430 can produce a recoverable deformation when the button 410 is pressed.

[0050] It should be noted that the phrase "the magnetic sensitive element 310 is electrically connected to the power assembly 200" means that the trigger signal generated by the magnetic sensitive element 310 can control the power assembly 200 to start, stop, accelerate, or decelerate. In an alternative embodiment, the circuit board 300 and the power assembly 200 are electrically connected to each other via wires or other components. The magnetic sensitive element 310 is integrated on the circuit board 300 and electrically connected to the power assembly 200 through the circuit board 300. When the button 410 moves relative to the housing 100, the magnetic sensitive element 310 and the magnet 420 generate magnetic induction, and then the circuit board 300 outputs a control signal to control the power assembly 200 to perform its action. Figure 2 In this embodiment, the circuit board 300 is disposed within the housing 100, that is, integrated into the medical power handle 10; of course, this application does not exclude the possibility of disposing of the circuit board 300 on the host connected to the medical power handle 10. It is worth noting that since the medical power handle 10 of this application is used in medical surgery, in order to reduce patient infection and ensure patient safety, the medical power handle 10 needs to be sterilized in a high-temperature steam environment after each use. In traditional mechanical trigger button structures, to ensure that the button can smoothly contact the tactile switch, the circuit board is exposed inside the housing. To prevent external steam from entering the housing through the area around the button, the button is made of deformable rubber material, and the button itself is a seal. This sealing structure has low reliability and is prone to failure after long-term use. Once steam enters the handle, the tactile switch will fail.

[0051] In view of this, in the embodiments of this application, based on the trigger signal generated by the magnetic sensitive element 310 triggered by the button connected to the magnet 420, the circuit board 300 and the button assembly 400 are sealed and spaced apart. In the embodiments of this application, the circuit board 300 is sealed by wrapping the circuit board 300 with a sealing adhesive. Of course, the circuit board 300 and the button assembly 400 can also be sealed and spaced apart in other ways. For example, the receiving cavity 11 can be formed on the button assembly 400, and the outer wall of the housing 100 can be used as the cavity wall of the receiving cavity 11. By placing the button assembly 400 outside the housing 100 and the circuit board inside the housing, the circuit board and the button assembly are sealed and spaced apart by the housing. Alternatively, a sealing gasket can be provided on the side of the positioning member 460 facing or away from the button 410, which can also achieve the sealing and spaced separation between the circuit board and the button assembly 400.

[0052] Figure 3 In this embodiment, the circuit board 300 is disposed in the mounting cavity 101, and the positioning member 460 and the cavity wall of the mounting cavity 101 form a potting chamber 103. The circuit board 300 is disposed in the potting chamber 103, which is filled with sealing glue. The sealing glue is used to cover the circuit board 300 to seal the circuit board 300 and prevent water vapor from contacting the circuit board 300 or the magnetic sensitive element 310 when the handle is sterilized in a high-temperature steam environment.

[0053] Optionally, the dispensing chamber 103 has a bottom surface facing the positioning member 460, and the magnetic sensitive element 310 protrudes relative to the circuit board 300. The circuit board 300 is in contact with the bottom surface of the dispensing chamber 103, and the magnetic sensitive element 310 is in contact with the positioning member 460. In this way, the positioning member 460 and the bottom surface of the dispensing chamber 103 can position the circuit board 300 with the integrated magnetic sensitive element 310, which is beneficial for more precise control of the position of the magnetic sensitive element 310 and improves the reliability of the button 410 controlling the medical power handle 10.

[0054] It is also worth noting that during the potting process, the sealant is first injected into the mounting cavity 101, and then the positioning member 460 is attached to the magnetic sensitive element 310 to form the potting chamber 103 and pressed against the sealant. Before the sealant solidifies from a liquid or semi-solid state to a solid state, in order to prevent the positioning member 460 from being pushed upwards due to the flow of the sealant and thus becoming loose, in a preferred embodiment, a limiting pin 470 is provided on the side of the key panel 440 facing the receiving cavity 11 (i.e., the side facing the bottom wall of the mounting cavity 101). The end of the limiting pin 470 away from the key panel 440 abuts against the positioning member 460. Even if the sealant has not yet solidified, the positioning member 460 can be pressed tightly by the limiting pin 470, thereby tightly abutting against the magnetic sensitive element 310 and preventing it from being pushed upwards by the sealant due to the flow of the sealant, ensuring that the positioning member 460 is firmly installed in the mounting cavity 101.

[0055] In addition, to facilitate operation by doctors, in some embodiments, such as Figure 1 and Figure 3 As shown, the button assembly 400 includes multiple buttons 410, each button 410 being connected to a corresponding magnet 420. Multiple magnetic sensitive elements 310 are correspondingly provided, with each button 410 positioned opposite to a corresponding magnetic sensitive element 310. Different buttons 410 are used to cause the power assembly 200 to output different states. For example, in the embodiment shown in the figure, there are three buttons 410: one button 410 is used to control the start and stop of the power assembly 200, another button 410 is used to control the acceleration of the power assembly 200, and the remaining button 410 is used to control the deceleration of the power assembly 200. Of course, the functions that the three buttons 410 can achieve are not limited to this; any function that allows the power assembly 200 to output different states is acceptable. Alternatively, the button assembly 400 may include only one button 410, and operating this single button 410 can also cause the power assembly 200 to output different states. There is no limitation on this.

[0056] In summary, the medical power handle 10 provided in this application, by setting the button assembly 400 to the structure of the above embodiment, not only solves the problem that the traditional mechanical button 410 cannot effectively contact the circuit control board, resulting in insensitive or even malfunctioning control of the handle, but also improves the feel of the doctor pressing the button 410. Furthermore, by encapsulating the circuit board 300 with adhesive, the sealing requirements of the circuit board 300 are met, improving the handle's performance in high-temperature steam sterilization and disinfection, and improving the reliability of the handle button 410.

[0057] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0058] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A medical powered handle characterized by, The utility model relates to a medical power handle, comprising: a housing; a power assembly arranged in the housing, the power assembly being configured to connect with a tool and drive the tool to perform a cutting action; a magnetically sensitive element arranged in the housing, the magnetically sensitive element being electrically connected to the power assembly; a key assembly having a key and a magnet connected to each other, the key being arranged on the housing directly or indirectly and being operable to move relative to the housing to approach the magnetically sensitive element and reset automatically, the magnetically sensitive element generating a trigger signal changing an output state of the power assembly when the key approaches the magnetically sensitive element.

2. The medical powered handle of claim 1, wherein, The medical power handle further comprises a circuit board arranged in the housing and electrically connected to the power assembly, the magnetically sensitive element being integrated on the circuit board, and the circuit board being sealed and isolated from the key assembly.

3. The medical powered handle of claim 1, wherein, The housing and the key assembly are formed with a receiving cavity, the receiving cavity being provided with an elastic element, one end of the elastic element being in abutment with the key directly or indirectly, and the other end of the elastic element being in abutment with a cavity wall of the receiving cavity directly or indirectly to provide an elastic force for resetting the key after the key approaches the magnetically sensitive element.

4. The medical powered handle of claim 3, wherein, The key assembly further comprises a positioning member arranged in the receiving cavity, the opposite ends of the elastic element being in abutment with the positioning member and the key respectively. The magnetically sensitive element is also arranged in the receiving cavity, the key and the elastic element being arranged on one side of the positioning member, and the magnetically sensitive element being arranged on the other side of the positioning member.

5. The medical powered handle of claim 4, wherein, The receiving cavity comprises a mounting cavity formed on an outer wall of the housing, the positioning member and a cavity wall of the mounting cavity surrounding a glue filling chamber, the magnetically sensitive element being integrated on a circuit board, the circuit board being arranged in the glue filling chamber, and the glue filling chamber being filled with a sealing glue body covering the circuit board.

6. The medical powered handle of claim 5, wherein, The glue filling chamber has a cavity bottom surface facing the positioning member, the magnetically sensitive element being arranged protruding relative to the circuit board, the circuit board being attached to the cavity bottom surface, and the magnetically sensitive element being attached to the positioning member.

7. The medical powered handle of claim 4, wherein, The receiving cavity comprises a mounting cavity formed on an outer wall of the housing, a side wall of the receiving cavity having a stepped surface facing the key, and the elastic element pressing the positioning member against the stepped surface.

8. The medical powered handle of claim 4, wherein, The key assembly comprises a key panel, the key being movably inserted into a key hole of the key panel, the key panel constituting part of a cavity wall of the receiving cavity, and the elastic element further providing an elastic force for the key to abut against the key panel after resetting.

9. The medical powered handle of claim 8, wherein, The key panel has a limiting pin on a side facing the receiving cavity, one end of the limiting pin away from the key panel being in abutment with the positioning member, and / or the key comprises a flange arranged on an outer edge of a key body, the flange being used to abut against the key panel when the key is reset.

10. The medical powered handle of claim 3, wherein, The key has a magnet seat on a side facing the receiving cavity, the elastic element being in abutment with the magnet seat to press the magnet seat against the key, and the magnet being arranged in the magnet seat.

11. The medical powered handle of any of claims 1-10, wherein, The key assembly comprises one key; or, the key assembly comprises a plurality of keys, each of the keys is connected with one magnet, and the magnet-sensitive element correspondingly has a plurality of magnet-sensitive elements, each of the keys is arranged opposite to one of the magnet-sensitive elements.

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