Sheath regulation mechanism and medical grinding device

Abstract

The present application relates to a sheath regulation mechanism and a medical grinding device. During use, when a locking assembly is in an unlocked position, a sheath regulation assembly can be unlocked, so that the sheath regulation assembly drives a sheath assembly to move in an axial direction, thereby steplessly regulating the axial position of the sheath assembly; and when the locking assembly is in a locked position, the sheath regulation assembly can move axially by means of circumferential rotation, so as to regulate the axial position of the sheath assembly. It can be seen therefrom that the present application can realize two regulation modes for the sheath assembly, which can not only realize manual regulation of the sheath, but also realize the stepless automatic regulation of the sheath, thereby performing the grinding operation more efficiently and safely, and improving the product performance.

Description

Sheath adjustment mechanism and medical grinding device Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a sheath adjustment mechanism and a medical grinding device. Background Technology

[0002] Commonly used grinding heads have difficulty controlling the grinding depth during grinding. After the grinding head penetrates the bone plate, it can easily damage the soft tissue beneath the bone. Especially since there is no support under the bone, when the grinding head applies pressure during grinding, the bone is compressed, which can easily compress the muscles, blood vessels, and nerves on the non-surgical side, causing damage to the new location of the body. At the same time, uneven force can also cause the surgical site to fail to meet the surgical requirements, prolonging the operation period and affecting the patient's treatment.

[0003] Related technologies have introduced grinding heads with sheaths, the axial positions of which are adjustable between the sheath and the grinding head. By adjusting the position of the sheath along the axial direction, relative movement between the sheath and the grinding head can be achieved, thereby controlling the sawing depth of the grinding head. However, the grinding heads with sheaths in these technologies only have a manual sheath adjustment function, offering a single adjustment mode. This makes operation inconvenient and reduces safety during grinding. Summary of the Invention

[0004] Therefore, it is necessary to overcome the shortcomings of the existing technology and provide a sheath adjustment mechanism and a medical grinding device that can improve the ease of operation and safety.

[0005] A sheath adjustment mechanism is connected to a sheath assembly, the sheath adjustment mechanism comprising:

[0006] Handle assembly;

[0007] The sheath adjustment assembly has one end connected to the sheath assembly and the other end connected to the handle assembly, and is axially movable and circumferentially rotatable relative to the handle assembly.

[0008] The locking component has a locked position and an unlocked position, and cooperates with the sheath adjustment component. When the locking component is in the unlocked position, it unlocks the sheath adjustment component, causing the sheath adjustment component to move the sheath component axially to steplessly adjust the axial position of the sheath component. It is also used so that when the locking component is in the locked position, the sheath adjustment component can rotate circumferentially to move the sheath adjustment component axially to adjust the axial position of the sheath component.

[0009] A medical grinding device includes the aforementioned sheath adjustment mechanism, and further includes a sheath assembly, an outer blade assembly, an inner blade assembly, and a connecting shaft. The sheath assembly is sleeved on the outside of the outer blade assembly, and the proximal end of the sheath assembly is fixedly connected to the sheath adjustment assembly. The outer blade assembly is fixedly connected to the handle assembly. The inner blade assembly is rotatably inserted inside the outer blade assembly and is connected to the connecting shaft, which is used to connect to the power shaft of a motor.

[0010] In the above-mentioned sheath adjustment mechanism and medical grinding device, when the locking component is in the unlocked position, the sheath adjustment component can be unlocked, thereby causing the sheath adjustment component to move along the axial direction to steplessly adjust the axial position of the sheath component; when the locking component is in the locked position, the sheath adjustment component can be rotated circumferentially to move the sheath adjustment component axially to adjust the axial position of the sheath component. Attached Figure Description

[0011] Figure 1 is a structural diagram of a medical grinding device according to an embodiment of this application.

[0012] Figure 2 is an enlarged structural diagram of point A in Figure 1.

[0013] Figure 3 is an enlarged structural diagram of point B in Figure 1.

[0014] Figure 4 is an enlarged structural diagram of point C in Figure 1.

[0015] Figure 5 is a structural diagram of the sheath adjustment mechanism in the device shown in Figure 1.

[0016] Figure 6 is a structural diagram of the unlocking limiting body in the structure shown in Figure 5. 10. Sheath adjustment mechanism; 11. Handle assembly; 111. First annular groove; 112. Handle body body; 113. First support sleeve; 1131. Second boss; 114. Second support sleeve; 1141. Fourth boss; 1142. Second guide portion; 115. Third support sleeve; 1151. First boss; 1152. Third boss; 116. Bearing; 117. First elastic ring; 118. Third annular groove; 12. Unlocking limiting body; 121. First movable recess; 122. Second movable recess; 123. Arc-shaped transition wall; 124. First 13. Flange; 14. Elastic element; 15. Axial adjustment sleeve; 16. Limiting element; 17. Protrusion; 18. Fifth boss; 19. First guide part; 10. Sliding groove; 11. Manual adjustment shell; 12. Third guide part; 13. Moving sleeve; 14. Fourth guide part; 15. Mounting groove; 16. Outer cover; 17. Elastic sleeve; 18. Second elastic ring; 19. Limiting shell; 20. Sheath assembly; 21. Sheath; 22. Connecting pipe; 30. Outer cutter assembly; 40. Inner cutter assembly; 41. Grinding head; 42. Inner cutter bar; 50. Connecting shaft. Detailed Implementation

[0017] 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.

[0018] In the description of this application, it should be noted that the proximal end refers to the end of the instrument or component closer to the operator, and the distal end refers to the end of the instrument or component farther from the operator; the axial direction refers to the direction parallel to the line connecting the centers of the distal and proximal ends of the instrument or component, the radial direction refers to the direction perpendicular to the axial direction, and the circumferential direction refers to the direction surrounding the axial direction. It should be noted that the axial direction in this embodiment refers to the direction shown by Z in Figures 1 and 5.

[0019] Referring to Figures 1 and 5, an embodiment of this application provides a sheath adjustment mechanism 10 connected to a sheath assembly 20. The sheath adjustment mechanism 10 includes: a handle assembly 11; a sheath adjustment component, one end of which is connected to the sheath assembly 20, and the other end of which is connected to the handle assembly 11 and is axially movable and circumferentially rotatable relative to the handle assembly 11; and a locking component having a locked position and an unlocked position, which cooperates with the sheath adjustment component. When the locking component is in the unlocked position, the locking component unlocks the sheath adjustment component, causing the sheath adjustment component to drive the sheath assembly to move axially, thereby steplessly adjusting the axial position of the sheath assembly. It is also used so that when the locking component is in the locked position, the sheath adjustment component can be circumferentially rotated to move the sheath adjustment component axially, thereby adjusting the axial position of the sheath assembly.

[0020] Further, the locking assembly includes an unlocking limiter 12, an elastic element 13, and an axial adjustment sleeve 14. The unlocking limiter 12 is disposed on the handle assembly 11, and has a locked position and an unlocked position, and can rotate to switch between the locked and unlocked positions. The elastic element 13 is disposed on the handle assembly 11. The axial adjustment sleeve 14 is connected to the handle assembly 11 via the elastic element 13, and can move axially relative to the handle assembly 11. The unlocking limiter 12 is located outside the axial adjustment sleeve 14, restricting the axial movement of the axial adjustment sleeve 14 in the axial direction by the locked position or releasing the axial movement of the axial adjustment sleeve 14 in the axial direction by the unlocked position. Specifically, when the unlocking limiter 12 is in the locked position, it restricts the axial movement of the axial adjustment sleeve 14 in the axial direction; when the unlocking limiter 12 is in the unlocked position, the axial adjustment sleeve 14 can move axially and causes the elastic element 13 to adaptively deform.

[0021] Furthermore, the sheath adjustment assembly includes a manual adjustment housing 15 and a movable sleeve 16. The manual adjustment housing 15 is rotatably fitted onto the outside of the axial adjustment sleeve 14, and is fixed relative to the axial adjustment sleeve 14 in the axial direction. The movable sleeve 16 is disposed inside the manual adjustment housing 15, and is fixed relative to the manual adjustment housing 15 in the axial direction. The movable sleeve 16 is connected to the sheath assembly 20. When the manual adjustment housing 15 rotates, it drives the movable sleeve 16 to move in the axial direction to adjust the extension position of the sheath assembly 20. When the manual adjustment housing 15 is not rotated, the movable sleeve 16 is fixed relative to the manual adjustment housing 15 in the axial direction.

[0022] When the unlocking limiter 12 rotates to the unlocking position and the sheath assembly 20 is subjected to force in the axial direction, the sheath assembly 20 causes the movable sleeve 16 and the manual adjustment shell 15 to move in the axial direction, thereby driving the axial adjustment sleeve 14 to move in the axial direction.

[0023] The manual adjustment housing 15 is fixed relative to the axial adjustment sleeve 14 in the axial direction, meaning that the manual adjustment housing 15 cannot move relative to the axial adjustment sleeve 14 in the axial direction. Similarly, when the manual adjustment housing 15 is not rotated, the moving sleeve 16 is fixed relative to the manual adjustment housing 15 in the axial direction, meaning that the moving sleeve 16 cannot move relative to the manual adjustment housing 15 in the axial direction.

[0024] In use, when the unlocking limiter 12 of the aforementioned sheath adjustment mechanism 10 is rotated to the locked position, the unlocking limiter 12 restricts the axial adjustment sleeve 14 from moving in the axial direction. At this time, the position of the sheath assembly 20 in the axial direction can be adjusted manually. Specifically, the manual adjustment shell 15 is rotated, and when the manual adjustment shell 15 rotates, it drives the movable sleeve 16 to adjust its position in the axial direction. The movable sleeve 16 can correspondingly drive the sheath assembly 20 to adjust its position in the axial direction.

[0025] Furthermore, when the unlocking limit body 12 rotates to the unlocked position, the axial adjustment sleeve 14 can move along the axial direction, causing the elastic element 13 to deform adaptively. At this time, the position of the sheath assembly 20 along the axial direction can be adjusted manually, and stepless adjustment of the sheath assembly 20 along the axial direction can also be achieved. Specifically, when the sheath assembly 20 is subjected to force along the axial direction, the sheath assembly 20 drives the moving sleeve 16 to move along the axial direction. Since the moving sleeve 16 is relatively fixed in position with the manual adjustment shell 15 along the axial direction when the manual adjustment shell 15 is not rotated, it can drive the manual adjustment shell 15 to move along the axial direction. The manual adjustment shell 15 correspondingly drives the axial adjustment sleeve 14 to move along the axial direction, causing the elastic element 13 to deform adaptively. That is, the sheath assembly 20 adaptably and freely extends and retracts axially under the elastic force of the elastic element 13, realizing stepless automatic position adjustment.

[0026] Therefore, the sheath assembly 20 can be adjusted in two modes: the sheath 21 of the sheath assembly 20 can be adjusted manually, and the sheath 21 can be adjusted steplessly, so as to carry out grinding operations more efficiently and safely, and improve product performance.

[0027] Referring to Figures 5 and 6, in one embodiment, the unlocking limiting body 12 includes an unlocking limiting sleeve. The distal end of the unlocking limiting sleeve has a first movable recess 121 extending in a circumferential direction and a second movable recess 122 extending in a direction parallel to its axial direction. A first side of the first movable recess 121 in the circumferential direction communicates with the second movable recess 122 and corresponds to the unlocking position; a second side of the first movable recess 121 in the circumferential direction corresponds to the locking position. The proximal end of the axial adjusting sleeve 14 has a limiting member 141, which is movable along the first movable recess 121 and along the second movable recess 122. Thus, when the unlocking limit body 12 rotates, causing the limit member 141 to rotate to the second side of the first movable recess 121 in the circumferential direction, that is, when the unlocking limit body 12 rotates to the locked position, the unlocking limit body 12 and the axial adjustment sleeve 14 are relatively fixed in the axial direction. The position of the sheath assembly 20 in the axial direction can only be adjusted by rotating the manual adjustment shell 15. When the manual adjustment shell 15 is not rotated, the sheath assembly 20 cannot compress the elastic member 13 to adjust the axial position under force. When the unlocking limit body 12 rotates, causing the limit member 141 to rotate to the position where the first movable recess 121 and the second movable recess 122 are connected, that is, when the unlocking limit body 12 rotates to the unlocked position, the elastic member 13 adapts to deformation when the sheath assembly 20 is under force, and the unlocking limit body 12 and the axial adjustment sleeve 14 can adjust their positions axially.

[0028] In some embodiments, the limiting member 141 includes, but is not limited to, a limiting pin, a limiting shaft, a limiting rod, or a limiting protrusion disposed on the proximal end of the axial adjusting sleeve 14, and can be flexibly adjusted and set according to actual needs.

[0029] Specifically, the wall thickness of the proximal end of the axial adjustment sleeve 14 is greater than the wall thickness of other parts of the axial adjustment sleeve 14, thereby improving the installation stability of the limiting member 141.

[0030] In one embodiment, the entrance of the second movable recess 122 includes an arc-shaped transition wall 123 on the side near the first movable recess 121. Thus, during the movement of the limiting member 141 between the first movable recess 121 and the second movable recess 122, the arc-shaped transition wall 123 acts as a guide, thereby enabling smoother movement and adjustment of the limiting member 141 and preventing jamming or noise defects.

[0031] In one embodiment, the handle assembly 11 has a first annular groove 111 arranged circumferentially thereon, and the inner wall of the unlocking limiting sleeve has a first flange 124 movably disposed within the first annular groove 111; and / or, the inner wall of the unlocking limiting sleeve has a second annular groove arranged circumferentially thereon, and the handle assembly 11 has a second flange movably disposed within the second annular groove. Thus, the unlocking limiting sleeve can only rotate relative to the handle assembly 11 circumferentially, thereby enabling rotation to the locked or unlocked position; the unlocking limiting sleeve cannot move axially on the handle assembly 11 to adjust its position.

[0032] In one embodiment, the handle assembly 11 includes a handle body 112, a first support sleeve 113, and a second support sleeve 114. The first support sleeve 113 is fixedly fitted inside the handle body 112, with its distal end extending outside the handle body 112. Optionally, the outer wall of the first support sleeve 113 is provided with a step, and the handle body 112 is fitted onto the step. The step of the first support sleeve 113 and the distal end face of the handle body 112 cooperate to form a first annular groove 111, which facilitates processing. Of course, the first annular groove 111 can also be directly formed on the outer wall of the first support sleeve 113.

[0033] Furthermore, the unlocking limiting sleeve is rotatably fitted onto the distal end of the first support sleeve 113. The second support sleeve 114 is fixedly fitted inside the first support sleeve 113, with its distal end extending outside the first support sleeve 113. The axial adjustment sleeve 14 is movably mounted on the second support sleeve 114 in the axial direction. The elastic element 13 is a spring, fitted onto the outside of the second support sleeve 114, with its opposite ends abutting against the proximal end of the axial adjustment sleeve 14 and the first support sleeve 113, respectively. Thus, the handle assembly 11, including the handle body 112, the first support sleeve 113, and the second support sleeve 114, can be easily processed and assembled together.

[0034] Based on the aforementioned embodiments, the handle assembly 11 further includes a third support sleeve 115 connected between the first support sleeve 113 and the second support sleeve 114. The third support sleeve 115 is fitted inside the first support sleeve 113 and outside the second support sleeve 114, that is, the third support sleeve 115 is fitted inside the first support sleeve 113 and outside the rear end of the second support sleeve 114. The proximal end of the third support sleeve 115 extends outside the first support sleeve 113, that is, the proximal end of the third support sleeve 115 extends beyond the rear end of the first support sleeve 113. The interior of the third support sleeve 115 is used to install a bearing 116, and the inner blade assembly 40 is rotatably inserted into the bearing 116.

[0035] Specifically, to facilitate the assembly of the first support sleeve 113, the second support sleeve 114, and the third support sleeve 115, a first boss 1151 is provided on the distal outer wall of the third support sleeve 115, and a second boss 1131 is provided on the inner wall of the first support sleeve 113. The first boss 1151 and the second boss 1131 are positioned and engaged in the axial direction. In addition, a third boss 1152 is provided on the inner wall of the third support sleeve 115, and the proximal end of the second support sleeve 114 is positioned and engaged with the third boss 1152 in the axial direction. That is, the rear end of the second support sleeve 114 is positioned and engaged with the third boss 1152 in the axial direction.

[0036] Optionally, the proximal end of the elastic member 13 abuts against the second boss 1131.

[0037] In some embodiments, a fourth protrusion 1141 is provided on the distal outer wall of the second support sleeve 114, that is, a fourth protrusion 1141 is provided on the front outer wall of the second support sleeve 114. The fourth protrusion 1141 plays a positioning role for the axial adjusting sleeve 14 in the axial direction. Optionally, a fifth protrusion 143 is provided on the proximal inner wall of the axial adjusting sleeve 14. The fourth protrusion 1141 and the fifth protrusion 143 are positioned and engaged in the axial direction. In this way, the fourth protrusion 1141 plays a limiting role, which can prevent the axial adjusting sleeve 14 from detaching from the second support sleeve 114 in the axial direction.

[0038] In some embodiments, the handle assembly 11 further includes a first elastic ring 117 mounted on the outer wall of the first support sleeve 113. The first elastic ring 117 is made of, but is not limited to, rubber material. The first elastic ring 117 abuts against the inner wall of the unlocking limit body 12. When the unlocking limit body 12 rotates, the first elastic ring 117 increases the rotational resistance of the unlocking limit body 12 by rubbing against it, thereby improving the rotational feel.

[0039] To enable the axial adjusting sleeve 14 to be movably fitted onto the handle assembly 11 in the axial direction and to prevent the axial adjusting sleeve 14 from rotating on the handle assembly 11, the axial adjusting sleeve 14 is provided with a first guide portion 144, and a second guide portion 1142 on the handle assembly 11 that slides in cooperation with the first guide portion 144. Optionally, the first guide portion 144 may include, but is not limited to, a guide ball, a guide block, a guide rod, or a guide shaft, etc., and the second guide portion 1142 may be a guide groove provided on the handle assembly 11, extending in a direction parallel to the axial direction.

[0040] Referring to Figures 3 and 5, in one specific embodiment, the first guide portion 144 is a first fixed ball disposed on the inner wall of the axial adjustment sleeve 14, and the second guide portion 1142 is a guide groove disposed on the outer wall of the second support sleeve 114. The first fixed ball moves along the guide groove. Thus, the axial adjustment sleeve 14 moves axially on the second support sleeve 114 without rotating left or right relative to the second support sleeve 114, thereby preventing vibration from causing rotational displacement in the circumferential direction. Furthermore, since the axial adjustment sleeve 14 is fixedly disposed relative to the handle assembly 11 in the circumferential direction, it facilitates the surgeon to accurately adjust the unlocking limiter 12 to the unlocked or locked state during surgery.

[0041] In one embodiment, the sheath adjustment mechanism 10 further includes an outer cover 17. The outer cover 17 is disposed outside the unlocking limiting body 12 and is connected to the unlocking limiting body 12. The outer cover 17 can also rotatably cover the proximal end of the axial adjustment sleeve 14 and the proximal end of the manual adjustment shell 15. Thus, rotating the outer cover 17 can correspondingly drive the unlocking limiting body 12 to rotate and adjust to the locked or unlocked position. In addition, the outer cover 17 and the unlocking limiting body 12 are processed separately and then assembled together, which facilitates processing. Furthermore, the outer cover 17 serves both decorative and protective functions, shielding the proximal ends of the unlocking limiting body 12, the axial adjustment sleeve 14, and the manual adjustment shell 15 to prevent exposure and improve aesthetics.

[0042] In one embodiment, the sheath adjustment mechanism 10 further includes an elastic sleeve 18 fitted onto the outside of the handle assembly 11.

[0043] Optionally, the elastic sleeve 18 may be, but is not limited to, a silicone sleeve. In this way, the elastic sleeve 18 is soft and elastic during surgical procedures, which can improve the comfort of holding it.

[0044] Specifically, the elastic sleeve 18 is fitted onto the outside of the handle body 112. Optionally, a third annular groove 118 is formed on the outer wall of the handle body 112, and the third annular groove 118 is arranged around the circumference of the handle body 112. The elastic sleeve 18 is installed inside the third annular groove 118. In this way, the elastic sleeve 18 can be securely installed on the outside of the handle body 112.

[0045] Optionally, the outer wall of the elastic sleeve 18, the outer wall of the handle body 112, and the outer wall of the cover 17 are flush or substantially flush.

[0046] The outer cover 17 is provided with a first alignment mark, and the outer wall of the handle body 112 is provided with a second alignment mark corresponding to the first alignment mark. In this way, the first alignment mark and the second alignment mark serve as markers, which can determine whether the outer cover 17 has been rotated to the unlocked position or the locked position, making it convenient for doctors to rotate and adjust it.

[0047] Specifically, there are, for example, two first alignment marks arranged alternately along the circumference, and one second alignment mark. Rotating the outer cover 17 aligns the two first alignment marks with the second alignment mark, allowing rotation to the unlocked position and the locked position respectively.

[0048] Alternatively, there may be one first alignment mark and two second alignment marks arranged alternately along the circumference. Rotating the outer cover 17 allows the first alignment mark to be aligned with the two second alignment marks in sequence, enabling rotation to the unlocked position and the locked position respectively.

[0049] It should be noted that the rotation angles corresponding to the outer cover 17 and the unlocking limit body 12 rotating from the unlocked position to the locked position include, but are not limited to, 30°, 45°, 60°, 90°, 120°, 135°, 150° or 180°, etc. The specific angles can be flexibly adjusted and set according to actual needs, and are not limited here.

[0050] Referring to Figures 3 and 5, in one embodiment, a spiral-shaped third guide portion 151 is formed on the inner wall of the manual adjustment housing 15, and a fourth guide portion 161 is provided on the outer wall of the movable sleeve 16. A sliding groove 145 extending parallel to the axial direction is formed on the side wall of the axial adjustment sleeve 14, and the fourth guide portion 161 is slidably inserted into the sliding groove 145, and the fourth guide portion 161 also cooperates with the third guide portion 151. Thus, when the manual adjustment housing 15 rotates, since the fourth guide portion 161 is slidably inserted into the sliding groove 145, the third guide portion 151 drives the fourth guide portion 161 to move in the axial direction, and the fourth guide portion 161 correspondingly drives the movable sleeve 16 to move in the axial direction.

[0051] In some embodiments, the third guide portion 151 includes, but is not limited to, a spiral groove. The fourth guide portion 161 is, for example, a guide ball, a guide block, a guide rod, or a guide shaft. In this embodiment, the fourth guide portion 161 is specifically configured as a guide ball, which is made of steel. The outer wall of the movable sleeve 16 is provided with a mounting groove 162, and the guide ball is movably disposed inside the mounting groove 162, while also extending outside the mounting groove 162.

[0052] In some embodiments, the sheath adjustment mechanism 10 further includes a second elastic ring 191 mounted on the outer wall of the axial adjustment sleeve 14. The second elastic ring 191 is made of, but is not limited to, rubber material. The second elastic ring 191 abuts against the inner wall of the manual adjustment housing 15. When the manual adjustment housing 15 rotates, the second elastic ring 191 increases the rotational resistance of the manual adjustment housing 15 by rubbing against the inner wall of the manual adjustment housing 15, thereby improving the rotational operation feel.

[0053] In one embodiment, the sheath adjustment mechanism 10 further includes a limiting shell 192. The limiting shell 192 is detachably mounted on the distal end of the axial adjustment sleeve 14. The limiting shell 192 and the distal end of the manual adjustment shell 15 abut against each other in the axial direction. A protrusion 142 is provided on the outer wall of the axial adjustment sleeve 14, and the protrusion 142 abuts against the proximal end of the manual adjustment shell 15 in the axial direction. Thus, on the one hand, the limiting shell 192 and the protrusion 142 abut against the opposite ends of the manual adjustment shell 15, thereby preventing the manual adjustment shell 15 from moving in the axial direction, thus allowing the manual adjustment shell 15 to rotate only around the axial adjustment sleeve 14; on the other hand, the limiting shell 192 and the axial adjustment sleeve 14 are detachably connected, thereby facilitating parts processing and assembly.

[0054] Optionally, the connection method between the limiting shell 192 and the axial adjusting sleeve 14 includes, but is not limited to, threaded connection or snap-fit ​​connection, etc., which are not limited here.

[0055] Please refer to Figures 1 to 4. Another embodiment of this application provides a medical grinding device. The medical grinding device includes the sheath adjustment mechanism 10 of any of the above embodiments, and also includes a sheath assembly 20, an outer blade assembly 30, an inner blade assembly 40, and a connecting shaft 50. The sheath assembly 20 is sleeved on the outside of the outer blade assembly 30, and the proximal end of the sheath assembly 20 is fixedly connected to the movable sleeve 16. The outer blade assembly 30 is fixedly connected to the handle assembly 11. The inner blade assembly 40 is rotatably inserted inside the outer blade assembly 30 and is connected to the connecting shaft 50, which is used to connect to the power shaft of a motor.

[0056] In the aforementioned medical grinding device, when the unlocking limit body 12 rotates to the locked position, it restricts the axial adjustment sleeve 14 from moving axially. At this time, the position of the sheath assembly 20 along the axial direction can be adjusted manually. Specifically, the manual adjustment shell 15 rotates, causing the moving sleeve 16 to adjust its position axially, which in turn adjusts the sheath assembly 20 accordingly. When the unlocking limit body 12 rotates to the unlocked position, the axial adjustment sleeve 14 can move axially, causing the elastic element 13 to deform adaptively. This can also be adjusted manually. The sheath assembly 20 can also achieve stepless adjustment along the axial direction. Specifically, when the sheath assembly 20 is subjected to force along the axial direction, it drives the movable sleeve 16 to move along the axial direction. Since the movable sleeve 16 is relatively fixed in position relative to the manual adjustment shell 15 along the axial direction when the manual adjustment shell 15 is not rotated, it can drive the manual adjustment shell 15 to move along the axial direction. The manual adjustment shell 15 correspondingly drives the axial adjustment sleeve 14 to move along the axial direction, causing the elastic element 13 to adaptively deform. That is, the sheath assembly 20 adaptably and freely extends and retracts axially under the elastic force of the elastic element 13, realizing stepless automatic position adjustment. Thus, the sheath assembly 20 can be adjusted in two modes: manual adjustment of the sheath 21 and stepless automatic adjustment of the sheath 21, thereby enabling more efficient and safer grinding operations and improving product performance.

[0057] Please refer to Figures 1 and 2, wherein the sheath assembly 20 includes a sheath 21 and a connecting tube 22. The sheath 21 is connected to the connecting tube 22, which is sleeved on the outside of the outer blade assembly 30, and the proximal end of the connecting tube 22 is connected and fixed to the movable sleeve 16.

[0058] Please refer to Figures 2 and 3. Optionally, the outer blade assembly 30 includes an outer blade tube. The outer blade tube passes through the interior of the connecting pipe 22 and the interior of the second support sleeve 114, and the outer blade tube is connected and fixed to the inner wall of the second support sleeve 114.

[0059] Please refer to Figures 1 to 3. Optionally, the internal tool assembly 40 includes a grinding head 41 and an internal tool holder 42. The grinding head 41 is connected to the internal tool holder 42, and the internal tool holder 42 is connected to the connecting shaft 50.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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 sheath adjustment mechanism, connected to a sheath assembly, wherein, The sheath adjustment mechanism includes: Handle assembly; The sheath adjustment assembly has one end connected to the sheath assembly and the other end connected to the handle assembly, and is axially movable and circumferentially rotatable relative to the handle assembly. The locking component has a locked position and an unlocked position, and cooperates with the sheath adjustment component. When the locking component is in the unlocked position, it unlocks the sheath adjustment component, causing the sheath adjustment component to move the sheath component axially to steplessly adjust the axial position of the sheath component. It is also used so that when the locking component is in the locked position, the sheath adjustment component can rotate circumferentially to move the sheath adjustment component axially to adjust the axial position of the sheath component.

2. The sheath adjustment mechanism according to claim 1, wherein, The locking component includes: an unlocking limiter, the unlocking limiter being disposed on the handle assembly, the locking position and the unlocking position being disposed on the unlocking limiter, and the unlocking limiter being rotatable to switch between the locking position and the unlocking position; An elastic element is disposed on the handle assembly; An axial adjustment sleeve is connected to the handle assembly via the elastic element and is movable in the axial direction relative to the handle assembly. The axial adjustment sleeve is restricted from moving in the axial direction by the locking position or released from moving in the axial direction by the unlocking position.

3. The sheath adjustment mechanism according to claim 2, wherein, The unlocking limiting body includes an unlocking limiting sleeve. The distal end of the unlocking limiting sleeve is provided with a first movable recess extending in the circumferential direction and a second movable recess extending in a direction parallel to its axial direction. A first side of the first movable recess in the circumferential direction communicates with the second movable recess and is corresponding to the unlocking position. A second side of the first movable recess in the circumferential direction is corresponding to the locking position. The proximal end of the axial adjusting sleeve is provided with a limiting member. The limiting member can move along the first movable recess and can move along the second movable recess.

4. The sheath adjustment mechanism according to claim 3, wherein, The entrance of the second movable recess includes an arc-shaped transition wall on the side near the first movable recess.

5. The sheath adjustment mechanism according to claim 3, wherein, The handle assembly has a first annular groove arranged in its circumferential direction, and the inner wall of the unlocking limiting sleeve has a first flange, which is movably disposed in the first annular groove; and / or, the inner wall of the unlocking limiting sleeve has a second annular groove arranged in its circumferential direction, and the handle assembly has a second flange, which is movably disposed in the second annular groove.

6. The sheath adjustment mechanism according to claim 3, wherein, The handle assembly includes a handle body, a first support sleeve, and a second support sleeve; the first support sleeve is fixedly fitted inside the handle body, with its distal end extending outside the handle body; the unlocking limiting sleeve is rotatably fitted onto the distal end of the first support sleeve; the second support sleeve is fixedly fitted inside the first support sleeve, with its distal end extending outside the first support sleeve; the axial adjustment sleeve is movably mounted on the second support sleeve in the axial direction; the elastic element is a spring, fitted onto the outside of the second support sleeve, with its opposite ends abutting against the proximal end of the axial adjustment sleeve and the first support sleeve, respectively.

7. The sheath adjustment mechanism according to claim 6, wherein, The handle assembly further includes a third support sleeve connected between the first support sleeve and the second support sleeve. The third support sleeve is fitted inside the first support sleeve and outside the rear end of the second support sleeve. The proximal end of the third support sleeve extends out of the rear end of the first support sleeve. The interior of the third support sleeve is provided with a bearing for the inner blade assembly to pass through.

8. The sheath adjustment mechanism according to claim 7, wherein, The third support sleeve has a first protrusion on its distal outer wall and a second protrusion on its inner wall. The first protrusion and the second protrusion are positioned and engaged in the axial direction. The third support sleeve has a third protrusion on its inner wall and the rear end of the second support sleeve is positioned and engaged with the third protrusion in the axial direction.

9. The sheath adjustment mechanism according to claim 6, wherein, The second support sleeve has a fourth protrusion on its front outer wall and a fifth protrusion on its near inner wall. The fourth protrusion and the fifth protrusion are positioned and engaged in the axial direction.

10. The sheath adjustment mechanism according to claim 2, wherein, The axial adjusting sleeve is provided with a first guide portion, and the handle assembly is provided with a second guide portion, the second guide portion being slidably engaged with the first guide portion.

11. The sheath adjustment mechanism according to claim 10, wherein, The first guide portion is a first fixed ball disposed on the inner wall of the axial adjustment bar, and the second guide portion is disposed on the guide groove on the outer wall of the second support sleeve, and the first fixed ball can move along the guide groove.

12. The sheath adjusting mechanism according to any one of claims 2-11, wherein, The sheath adjustment assembly includes: A manually adjustable housing is rotatably fitted onto the locking assembly and is fixed relative to the locking assembly in the axial direction; and A movable sleeve is disposed inside the manually adjustable housing, and the movable sleeve and the manually adjustable housing are fixed relative to each other in the axial direction. The movable sleeve is connected to the sheath assembly. When the manually adjustable housing rotates, it can drive the movable sleeve to move in the axial direction to adjust the extension position of the sheath assembly; wherein, When the locking component is in the unlocked position and the sheath assembly is subjected to force in the axial direction, the sheath assembly causes the movable sleeve and the manual adjustment shell to move in the axial direction to steplessly adjust the axial position of the sheath assembly; when the locking component is in the locked position, the manual adjustment shell can be manually rotated to move the movable sleeve in the axial direction to adjust the axial position of the sheath assembly.

13. The sheath adjustment mechanism according to claim 12, wherein, The inner wall of the manual adjustment housing is provided with a spiral-shaped third guide portion, the outer wall of the movable sleeve is provided with a fourth guide portion, the side wall of the axial adjustment sleeve is provided with a sliding groove extending in a direction parallel to the axial direction, the fourth guide portion is slidably inserted in the sliding groove, and the fourth guide portion also cooperates with the third guide portion.

14. The sheath adjustment mechanism according to claim 13, wherein, The sheath adjustment mechanism also includes a limiting shell, which is detachably installed at the distal end of the axial adjustment sleeve. The limiting shell and the distal end of the manual adjustment shell abut against each other in the axial direction. The outer wall of the axial adjustment sleeve is provided with a protrusion, which abuts against the proximal end of the manual adjustment shell in the axial direction.

15. The sheath adjusting mechanism according to any one of claims 2-11, wherein, The sheath adjustment mechanism also includes an outer cover, which is located outside the unlocking limit body and connected to the unlocking limit body; the outer cover can also be rotatably positioned outside the proximal end of the axial adjustment sleeve and the proximal end of the manual adjustment shell.

16. The sheath adjustment mechanism according to claim 15, wherein, The sheath adjustment mechanism also includes an elastic sleeve fitted onto the outside of the handle assembly; The outer cover is provided with a first alignment mark, and the outer wall of the handle body is provided with a second alignment mark corresponding to the first alignment mark.

17. A medical grinding device, wherein, The medical grinding device includes a sheath adjustment mechanism as described in any one of claims 1 to 11, and further includes a sheath assembly, an outer blade assembly, an inner blade assembly, and a connecting shaft; the sheath assembly is sleeved on the outside of the outer blade assembly, the proximal end of the sheath assembly is fixedly connected to the sheath adjustment assembly, the outer blade assembly is fixedly connected to the handle assembly, the inner blade assembly is rotatably inserted inside the outer blade assembly, the inner blade assembly is connected to the connecting shaft, and the connecting shaft is used to connect to the power shaft of a motor.

18. The medical grinding apparatus according to claim 17, wherein, The sheath assembly includes a sheath and a connecting tube. The sheath is connected to the connecting tube, which is sleeved on the outside of the outer channel assembly. The proximal end of the connecting tube is connected and fixed to the movable sleeve of the sheath adjustment assembly.

19. The medical grinding apparatus according to claim 18, wherein, The outer blade assembly includes an outer blade tube, which passes through the interior of the connecting pipe and the interior of the second support sleeve. The outer blade tube is connected and fixed to the inner wall of the second support sleeve.

20. The medical grinding apparatus according to claim 19, wherein, The internal tool assembly includes a grinding head and an internal tool holder, the grinding head being connected to the internal tool holder, and the internal tool holder being connected to the connecting shaft.

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