Sheath stepless adjustment mechanism and medical grinding device

Abstract

This application relates to a sheath stepless adjustment mechanism and a medical grinding device. The sheath adjustment assembly drives the axial adjustment sleeve to move axially and causes the elastic member to adaptively deform, thereby steplessly adjusting the axial position of the sheath assembly. When the unlocking limiter rotates to the locking position, the axial adjustment sleeve is axially locked to lock the axial position of the sheath assembly. This application enables stepless automatic adjustment of the sheath, thereby making the grinding operation more efficient and safer, and improving product performance.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a sheath stepless adjustment mechanism and a medical grinding device. Background Art

[0002] In related art, sheathed grinding heads feature adjustable axial positions of the sheath and the grinding head. Axial adjustment of the sheath allows relative movement between the sheath and the grinding head, thereby controlling the cutting depth of the grinding head. However, these sheathed grinding heads only offer manual adjustment of the sheath, making them inconvenient to operate and less safe during grinding. Summary of the Invention

[0003] Based on this, it is necessary to overcome the defects of the prior art and provide a sheath stepless adjustment mechanism and a medical grinding device, which can improve the convenience and safety of operation.

[0004] A sheath stepless adjustment mechanism connected to the sheath assembly, comprising:

[0005] handle assembly;

[0006] an unlocking limiter, rotatably disposed on the handle assembly, the unlocking limiter having a locking position and an unlocking position, and the unlocking limiter being rotatable between the locking position and the unlocking position;

[0007] an axial adjustment sleeve, which is provided on the handle assembly and can move in the axial direction, and the axial adjustment sleeve cooperates with the unlocking limiter; an elastic member, which is connected to the axial adjustment sleeve;

[0008] A sheath adjustment component, one end of which is connected to the axial adjustment sleeve and the other end is connected to the sheath component; wherein,

[0009] When the unlocking limit body rotates to the unlocking position, the sheath adjustment assembly drives the axial adjustment sleeve to move in the axial direction and causes the elastic member to adaptively deform to steplessly adjust the axial position of the sheath assembly; when the unlocking limit body rotates to the locking position, the axial adjustment sleeve is axially locked.

[0010] In one embodiment, the unlocking limit body includes an unlocking limit sleeve, and the distal end of the unlocking limit sleeve is provided with a first movable recess extending in the circumferential direction and a second movable recess extending in parallel with the axial direction thereof, the first movable recess is connected to the second movable recess along the first side of the circumferential direction and is arranged corresponding to the unlocking position, and the first movable recess is arranged corresponding to the locking position along the second side of the circumferential direction; the proximal end of the axial adjustment sleeve is provided with a limit member, and the limit member can move along the first movable recess and can move along the second movable recess.

[0011] In one embodiment, a side of the entrance of the second movable recess close to the first movable recess includes an arc-shaped transition wall.

[0012] In one embodiment, a first annular groove is formed on the handle body assembly along its circumferential direction, a first flange is provided on the inner wall of the unlocking limit sleeve, and the first flange is movably disposed in the first annular groove; and / or a second annular groove is provided on the inner wall of the unlocking limit sleeve along its circumferential direction, the handle body assembly is provided with a second flange, and the second flange is movably disposed in the second annular groove.

[0013] In one embodiment, the handle body assembly includes a handle body main body, a first support sleeve and a second support sleeve; the first support sleeve is fixedly mounted on the inside of the handle body main body, and the distal end of the first support sleeve extends to the outside of the handle body main body; the unlocking limit sleeve is rotatably mounted on the distal end of the first support sleeve; the second support sleeve is fixedly mounted on the inside of the first support sleeve, and the distal end of the second support sleeve extends to the outside of the first support sleeve, and the axial adjustment sleeve is movably arranged on the second support sleeve along the axial direction; the elastic member is a spring, and the spring is mounted on the outside of the second support sleeve, and the opposite ends of the elastic member are respectively in contact with the proximal end of the axial adjustment sleeve and the first support sleeve.

[0014] In one embodiment, the sheath stepless adjustment mechanism also includes an outer cover, which is arranged on the outside of the unlocking limit body and is connected to the unlocking limit body; the outer cover can also be rotatably arranged on the outside of the proximal end of the axial adjustment sleeve and the proximal end of the sheath adjustment assembly.

[0015] In one embodiment, the sheath stepless adjustment mechanism further includes an elastic sleeve sleeved on the outside of the handle assembly;

[0016] A first alignment mark is provided on the outer cover, and a second alignment mark corresponding to the first alignment mark is provided on the outer wall of the handle body assembly.

[0017] In one embodiment, the sheath adjustment assembly includes a manual adjustment shell and a movable sleeve; the manual adjustment shell is rotatably mounted on the outside of the axial adjustment sleeve, and the manual adjustment shell is fixed relative to the axial adjustment sleeve in the axial direction; the proximal end of the axial adjustment sleeve extends out of the manual adjustment shell and into the interior of the unlocking limiter;

[0018] The movable sleeve is arranged inside the manually adjustable shell, and the movable sleeve is used to be connected to the sheath assembly. The manually adjustable shell is connected to the movable sleeve, and when the manually adjustable shell rotates, it can drive the movable sleeve to adjust its position along the axial direction; when the manually adjustable shell does not rotate, the movable sleeve is relatively fixed with respect to the manually adjustable shell in the axial direction.

[0019] In one embodiment, a third spiral guide portion is formed on the inner wall of the manual adjustment shell, a fourth guide portion is provided on the outer wall of the movable sleeve, and a sliding groove extending parallel to the axial direction is formed on the side wall of the axial adjustment sleeve. The fourth guide portion can be slidably inserted into the sliding groove, and the fourth guide portion also cooperates with the third guide portion.

[0020] In one embodiment, the sheath stepless adjustment mechanism also includes a limit shell, which is detachably mounted on the distal end of the axial adjustment sleeve, and the limit shell and the distal end of the sheath adjustment component abut and cooperate with each other in the axial direction. A protrusion is provided on the outer wall of the axial adjustment sleeve, and the protrusion abuts and cooperates with the proximal end of the sheath adjustment component in the axial direction.

[0021] A medical grinding device, which includes the sheath stepless adjustment mechanism, and also includes a sheath assembly, an outer knife assembly, an inner knife assembly and a connecting shaft; the sheath assembly is sleeved on the outside of the outer knife assembly, the proximal end of the sheath assembly is connected to the sheath adjustment assembly, the outer knife assembly is fixedly connected to the handle body assembly, the inner knife assembly is rotatably inserted into the interior of the outer knife assembly, the inner knife assembly is connected to the connecting shaft, and the connecting shaft is used to be connected to the power shaft of the motor.

[0022] The above-mentioned sheath stepless adjustment mechanism and medical grinding device, during use, when the unlocking limiter rotates to the locked position, the unlocking limiter restricts the axial adjustment sleeve from moving in the axial direction. At this time, the sheath assembly can be manually adjusted in the axial direction by operating the sheath adjustment assembly. When the unlocking limiter rotates to the unlocked position, the axial adjustment sleeve can move in the axial direction and cause the elastic member to deform adaptively. In this case, the sheath assembly can be adjusted in the axial direction by manual adjustment, and the sheath assembly can also be adjusted in the axial direction steplessly. Specifically, when the sheath assembly is subjected to an axial force, the sheath assembly drives the sheath adjustment assembly to move in the axial direction, which in turn drives the axial adjustment sleeve to move in the axial direction and cause the elastic member to deform adaptively. In other words, the sheath assembly is adaptively and freely axially extended and retracted under the elastic force of the elastic member, achieving stepless automatic position adjustment. As can be seen, the sheath assembly can be adjusted in two modes: manual adjustment of the sheath and stepless automatic adjustment of the sheath, thereby making the grinding operation more efficient and safer, and improving product performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a structural diagram of a medical grinding device according to an embodiment of the present application.

[0024] Figure 2 for Figure 1 Enlarged structural diagram at point A.

[0025] Figure 3 for Figure 1 Enlarged structural diagram at B.

[0026] Figure 4 for Figure 1 Enlarged structural diagram at C.

[0027] Figure 5 for Figure 1 Structural diagram of the sheath stepless adjustment mechanism in the device shown.

[0028] Figure 6 for Figure 5 Structural diagram of the unlocking limiter in the structure shown.

[0029] 10. Sheath stepless adjustment mechanism; 11. Handle assembly; 111. First annular groove; 112. Handle body; 113. First support sleeve; 1131. Second boss; 114. Second support sleeve; 1141. Fourth boss; 1142. Second guide; 115. Third support sleeve; 1151. First boss; 1152. Third boss; 116. Bearing; 117. First elastic ring; 118. Third annular groove; 12. Unlocking limiter; 121. First movable recess; 122. Second movable recess; 123. Arc-shaped transition wall; 124. First movable recess A flange; 13. Elastic member; 14. Axial adjustment sleeve; 141. Limiting member; 142. Protrusion; 143. Fifth boss; 144. First guide portion; 145. Sliding groove; 15. Manual adjustment shell; 151. Third guide portion; 16. Moving sleeve; 161. Fourth guide portion; 162. Mounting groove; 17. Outer cover; 18. Elastic sleeve; 191. Second elastic ring; 192. Limiting shell; 20. Sheath assembly; 21. Sheath; 22. Connecting pipe; 30. Outer knife assembly; 40. Inner knife assembly; 41. Grinding head; 42. Inner knife rod; 50. Connecting shaft. DETAILED DESCRIPTION

[0030] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0031] In the description of this application, it should be noted that the proximal end refers to the end of the instrument or component close to the operator, and the distal end refers to the end of the instrument or component away from the operator; the axial direction refers to the direction parallel to the line connecting 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 around the axial direction. It should be noted that the axial direction in this embodiment refers to Figure 1 and Figure 5 The direction shown by Z.

[0032] See Figure 1 and Figure 5An embodiment of the present application provides a sheath stepless adjustment mechanism 10, which includes: a handle body assembly 11, an unlocking limiter 12, an elastic member 13, an axial adjustment sleeve 14, and a sheath adjustment assembly. The unlocking limiter 12 is rotatably disposed on the handle body assembly 11 and has a locking position and an unlocking position. The unlocking limiter 12 can be rotated to the locking position and the unlocking position. The elastic member 13 is disposed inside the unlocking limiter 12. The axial adjustment sleeve 14 is disposed between the handle body assembly 11 and the unlocking limiter 12, and is connected to the handle body assembly 11 through the elastic member 13 and can move in the axial direction. Specifically, the axial adjustment sleeve 14 is movably disposed on the handle body assembly 11 in the axial direction. The axial adjustment sleeve 14 is passed through the unlocking limiter 12. One end of the sheath adjustment assembly is connected to the axial adjustment sleeve 14, and the other end of the sheath adjustment assembly is connected to the sheath assembly 20. When the unlocking limit body 12 rotates to the locking position, the unlocking limit body 12 limits the axial adjustment sleeve 14 from moving in the axial direction; when the unlocking limit body 12 rotates to the unlocking position, the axial adjustment sleeve 14 can move in the axial direction under the drive of the sheath adjustment assembly and make the elastic member 13 adaptively deform to steplessly adjust the position of the sheath assembly along the axial direction.

[0033] Specifically, the sheath adjustment assembly includes a manual adjustment housing 15 and a movable sleeve 16. The manual adjustment housing 15 is rotatably mounted on the exterior of the axial adjustment sleeve 14, and is axially fixed relative to the axial adjustment sleeve 14. The movable sleeve 16 is disposed within the interior of the manual adjustment housing 15 and is configured to connect to the sheath assembly 20. The manual adjustment housing 15 is connected to the movable sleeve 16, and when the manual adjustment housing 15 is rotated, the movable sleeve 16 is axially adjusted. When the manual adjustment housing 15 is not rotated, the movable sleeve 16 is axially fixed relative to the manual adjustment housing 15.

[0034] The manual adjustment housing 15 is fixed relative to the axial adjustment sleeve 14 in the axial direction, that is, 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 movable sleeve 16 is fixed relative to the manual adjustment housing 15 in the axial direction, that is, the movable sleeve 16 cannot move relative to the manual adjustment housing 15 in the axial direction.

[0035] During use, when the unlocking limiter 12 is rotated to the locked position, the unlocking limiter 12 restricts the axial movement of the axial adjustment sleeve 14. At this time, the axial position of the sheath assembly 20 can be adjusted manually. Specifically, the manual adjustment shell 15 is rotated, and when the manual adjustment shell 15 rotates, the movable sleeve 16 is driven 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.

[0036] In addition, when the unlocking limiter 12 is rotated to the unlocking position, the axial adjustment sleeve 14 can move in the axial direction and cause the elastic member 13 to deform adaptively. At this time, the position of the sheath assembly 20 in the axial direction can be adjusted manually, and the sheath assembly 20 can also be adjusted steplessly in the axial direction. Specifically, when the sheath assembly 20 is subjected to force in the axial direction, the sheath assembly 20 drives the movable sleeve 16 to move in the axial direction. Since the movable sleeve 16 is relatively fixed in the axial direction with the manual adjustment shell 15 when the manual adjustment shell 15 is not rotated, it can drive the manual adjustment shell 15 to move in the axial direction. The manual adjustment shell 15 correspondingly drives the axial adjustment sleeve 14 to move in the axial direction and causes the elastic member 13 to deform adaptively. That is, the sheath assembly 20 is adaptively free to extend and retract axially under the elastic force of the elastic member 13, thereby achieving stepless automatic position adjustment.

[0037] It can be seen that the sheath assembly 20 can be adjusted in two modes, that is, the sheath 21 can be adjusted manually and the sheath 21 can be adjusted steplessly and automatically, thereby performing the grinding operation more efficiently and safely and improving product performance.

[0038] Of course, as some optional solutions, the sheath adjustment assembly is not limited to the above-mentioned structure including the manual adjustment shell 15 and the movable sleeve 16. It can also be flexibly adjusted and configured as other manual adjustment structures according to actual needs, as long as the position of the sheath assembly 20 in the axial direction can be adjusted manually. For example, the movable sleeve 16 can be omitted, and the sheath adjustment assembly can be directly connected to the sheath assembly 20. When the sheath adjustment assembly rotates, it directly drives the sheath assembly 20 to adjust steplessly in the axial direction.

[0039] See also Figure 5 and Figure 6In one embodiment, the unlocking limiter 12 includes an unlocking limiter sleeve. The distal end of the unlocking limiter sleeve is provided with a first movable recess 121 extending in the circumferential direction and a second movable recess 122 extending parallel to the axial direction thereof. The first movable recess 121 is connected to the second movable recess 122 along a first side in the circumferential direction and is arranged corresponding to the unlocking position. The first movable recess 121 is arranged corresponding to the locking position along a second side in the circumferential direction. The proximal end of the axial adjustment sleeve 14 is provided with a limiter 141, which can move along the first movable recess 121 and the second movable recess 122. In this way, when the unlocking limit body 12 rotates, causing the limit piece 141 to rotate to the second side of the first movable recess 121 along the circumferential direction, that is, 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, and 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 21 adjustment assembly is subjected to force and cannot compress the elastic piece 13 to adjust the axial position; when the unlocking limit body 12 rotates, causing the limit piece 141 to rotate to the position where the first movable recess 121 and the second movable recess 122 are connected to each other, that is, the unlocking limit body 12 rotates to the unlocked position, when the sheath assembly 20 is subjected to force, the elastic piece 13 adaptively deforms, and the unlocking limit body 12 and the axial adjustment sleeve 14 can axially move and adjust their positions.

[0040] 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 provided on the proximal end of the axial adjustment sleeve 14 , and can be flexibly adjusted and set according to actual needs.

[0041] Specifically, the wall thickness of the proximal end of the axial adjustment sleeve 14 is preferably greater than the wall thickness of other parts of the axial adjustment sleeve 14 , thereby improving the installation stability of the limiting member 141 .

[0042] In one embodiment, the entrance of the second movable recess 122 includes a curved transition wall 123 on a side close to the first movable recess 121. Thus, the curved transition wall 123 guides the position-limiting member 141 as it moves between the first and second movable recesses 121, 122, thereby enabling smoother movement and adjustment of the position-limiting member 141 and preventing jitter and noise.

[0043] In one embodiment, a first annular groove 111 is formed on the handle assembly 11 along its circumferential direction, and a first flange 124 is provided on the inner wall of the unlocking limit sleeve, which is movably disposed within the first annular groove 111; and / or a second annular groove is provided on the inner wall of the unlocking limit sleeve along its circumferential direction, and a second flange is provided on the handle assembly 11, which is movably disposed within the second annular groove. In this manner, the unlocking limit sleeve can only rotate relative to the handle assembly 11 along its circumferential direction, thereby being rotated to a locked position or an unlocked position; the unlocking limit sleeve cannot be moved axially on the handle assembly 11 to adjust its position.

[0044] 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 mounted inside the handle body 112, with the distal end of the first support sleeve 113 extending outside the handle body 112. Optionally, a step is provided on the outer wall of the first support sleeve 113, and the handle body 112 is mounted on the step. The step of the first support sleeve 113 cooperates with the distal end surface of the handle body 112 to form a first annular groove 111, which facilitates processing. Of course, the first annular groove 111 can also be formed directly on the outer wall of the first support sleeve 113.

[0045] In addition, the unlocking limit sleeve is rotatably mounted on the distal end of the first support sleeve 113. The second support sleeve 114 is fixedly mounted inside the first support sleeve 113, with the distal end of the second support sleeve 114 extending outside the first support sleeve 113. The axial adjustment sleeve 14 is movably mounted on the second support sleeve 114 along the axial direction. The elastic member 13 is, for example, a spring, which is mounted outside the second support sleeve 114. The opposite ends of the elastic member 13 respectively abut the proximal end of the axial adjustment sleeve 14 and the first support sleeve 113. In this way, the handle body assembly 11 includes the handle body 112, the first support sleeve 113, and the second support sleeve 114, which can be easily processed and assembled together.

[0046] Based on the previous embodiment, 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 sleeved inside the first support sleeve 113 and outside the second support sleeve 114. The proximal end of the third support sleeve 115 extends outside the first support sleeve 113. A bearing 116 is mounted inside the third support sleeve 115, and the inner blade assembly 40 is rotatably mounted in the bearing 116.

[0047] Specifically, to facilitate 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 matched 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 matched in the axial direction with the third boss 1152.

[0048] Optionally, the proximal end of the elastic member 13 abuts against the second boss 1131 .

[0049] In some embodiments, a fourth boss 1141 is provided on the distal outer wall of the second support sleeve 114. This boss 1141 positions the axial adjustment sleeve 14 in the axial direction. Optionally, a fifth boss 143 is provided on the proximal inner wall of the axial adjustment sleeve 14. This boss 1141 cooperates with the fifth boss 143 in the axial direction. Thus, the fourth boss 1141 acts as a stop, preventing the axial adjustment sleeve 14 from detaching from the second support sleeve 114 in the axial direction.

[0050] 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 may be made of, but is not limited to, a rubber material. The first elastic ring 117 abuts against the inner wall of the unlocking stopper 12. When the unlocking stopper 12 rotates, the first elastic ring 117 rubs against the unlocking stopper 12, increasing the rotational resistance of the unlocking stopper 12 and improving the feel of the rotation operation.

[0051] In order to enable the axial adjustment sleeve 14 to be movably sleeved on the handle body assembly 11 in the axial direction and to prevent the axial adjustment sleeve 14 from rotating on the handle body assembly 11, the axial adjustment sleeve 14 is provided with a first guide portion 144 and a second guide portion 1142 on the handle body assembly 11 that slidably cooperates with the first guide portion 144. Optionally, the first guide portion 144 includes, but is not limited to, a guide ball, a guide block, a guide rod, or a guide shaft, and the second guide portion 1142 is a guide groove provided on the handle body assembly 11, and the second guide portion 1142 extends parallel to the axial direction.

[0052] See also Figure 3 and Figure 5In one specific embodiment, the first guide portion 144 is disposed on a first fixed axis 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, along which the first fixed ball moves. In this manner, 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 circumferential rotational displacement caused by vibration. Furthermore, because the axial adjustment sleeve 14 is fixed circumferentially relative to the handle assembly 11, it facilitates the surgeon's accurate rotational adjustment of the unlocking stopper 12 to either the unlocked or locked position during surgery.

[0053] In one embodiment, the sheath stepless adjustment mechanism 10 further includes an outer cover 17. The outer cover 17 is disposed on the outside of the unlocking limiter 12 and is connected to the unlocking limiter 12. The outer cover 17 can also be rotatably disposed on the outside of the proximal end of the axial adjustment sleeve 14 and the proximal end of the manual adjustment shell 15. In this way, by rotating and adjusting the outer cover 17, the outer cover 17 can correspondingly drive the unlocking limiter 12 to rotate and adjust to the locked position or the unlocked position; in addition, the outer cover 17 and the unlocking limiter 12 are processed separately and then assembled together, which can facilitate processing; in addition, the outer cover 17 plays a decorative and protective role, shielding the unlocking limiter 12, the proximal end of the axial adjustment sleeve 14, and the proximal end of the manual adjustment shell 15 to prevent them from being exposed, thereby improving the appearance.

[0054] In one embodiment, the sheath stepless adjustment mechanism 10 further includes an elastic sleeve 18 sleeved on the outside of the handle assembly 11 .

[0055] Optionally, the elastic sleeve 18 includes but is not limited to a silicone sleeve. In this way, during the surgical operation, the elastic sleeve 18 is soft and elastic, which can improve the comfort of holding.

[0056] Specifically, the elastic sleeve 18 is sleeved onto the exterior of the handle body 112. Optionally, a third annular groove 118 is formed on the outer wall of the handle body 112, circumferentially surrounding the handle body 112. The elastic sleeve 18 is mounted within the third annular groove 118. This ensures that the elastic sleeve 18 is securely mounted onto the exterior of the handle body 112.

[0057] Optionally, the outer wall of the elastic sleeve 18 , the outer wall of the handle body 112 , and the outer wall of the outer cover 17 are arranged flush or substantially flush.

[0058] 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 and second alignment marks serve as markers to determine whether the outer cover 17 is rotated to the unlocked position or the locked position, which facilitates the doctor's rotation adjustment.

[0059] Specifically, there are two first alignment marks spaced apart in the circumferential direction, and one second alignment mark. The outer cover 17 is rotated so that the two first alignment marks are aligned with the second alignment mark, and can be rotated to the unlocked position and the locked position respectively.

[0060] Alternatively, there is one first alignment mark and two second alignment marks, which are spaced apart in the circumferential direction. The outer cover 17 is rotated so that the first alignment mark is aligned with the two second alignment marks in sequence, and can be rotated to the unlocked position and the locked position respectively.

[0061] It should be noted that the rotation angle corresponding to the rotation of the outer cover 17 and the unlocking limiter 12 from the unlocked position to the locked position includes but is not limited to 30°, 45°, 60°, 90°, 120°, 135°, 150° or 180°, etc., which can be flexibly adjusted and set according to actual needs and are not limited here.

[0062] See also Figure 3 and Figure 5 In one embodiment, a spirally 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. The fourth guide portion 161 is slidably inserted into the sliding groove 145 and 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.

[0063] In some embodiments, the third guide portion 151 includes, but is not limited to, a spiral groove. The fourth guide portion 161 may be, 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, and the guide ball is a steel ball. A mounting groove 162 is provided on the outer wall of the movable sleeve 16. The guide ball is movably disposed within the mounting groove 162 and extends outside the mounting groove 162.

[0064] In some embodiments, the sheath stepless 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 may be made of, but is not limited to, a 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 rubs against the inner wall of the manual adjustment housing 15, increasing the rotational resistance of the manual adjustment housing 15 and improving the feel of the rotation operation.

[0065] In one embodiment, the sheath stepless adjustment mechanism 10 further includes a stopper housing 192. The stopper housing 192 is detachably mounted on the distal end of the axial adjustment sleeve. The stopper housing 192 and the distal end of the manual adjustment sleeve 15 abut against each other in the axial direction. A protrusion 142 is provided on the outer wall of the axial adjustment sleeve, and the protrusion 142 abuts against the proximal end of the manual adjustment sleeve 15 in the axial direction. Thus, on the one hand, the stopper housing 192 and the protrusion 142 abut against opposite ends of the manual adjustment sleeve 15, thereby preventing the manual adjustment sleeve 15 from moving in the axial direction, thereby allowing the manual adjustment sleeve 15 to rotate only about the axial adjustment sleeve. On the other hand, the stopper housing 192 and the axial adjustment sleeve are detachably connected, thereby facilitating part processing and assembly.

[0066] Optionally, the connection method between the limiting shell 192 and the axial adjustment sleeve includes but is not limited to a threaded connection or a snap connection, etc., which is not limited here.

[0067] See also Figures 1 to 4 Another embodiment of the present application provides a medical grinding device, which includes the sheath stepless adjustment mechanism 10 of any of the above embodiments, and also includes a sheath assembly 20, an outer knife assembly 30, an inner knife assembly 40 and a connecting shaft 50. The sheath assembly 20 is sleeved on the outside of the outer knife assembly 30. The proximal end of the sheath assembly 20 is connected to the sheath adjustment assembly. Specifically, the proximal end of the sheath assembly 20 is fixedly connected to the movable sleeve 16. The outer knife assembly 30 is fixedly connected to the handle body assembly 11, and the inner knife assembly 40 is rotatably inserted into the interior of the outer knife assembly 30. The inner knife assembly 40 is connected to the connecting shaft 50, and the connecting shaft 50 is used to be connected to the power shaft of the motor.

[0068] When the above-mentioned medical grinding device is in use, when the unlocking limit body 12 is rotated to the locked position, the unlocking limit body 12 limits 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 by operating the sheath adjustment component; when the unlocking limit body 12 is rotated to the unlocked position, the axial adjustment sleeve 14 can move in the axial direction and cause the elastic member 13 to deform adaptively. At this time, the position of the sheath assembly 20 in the axial direction can be adjusted manually, and the sheath assembly 20 can also be adjusted steplessly in the axial direction. Specifically, when the sheath assembly 20 is subjected to force in the axial direction, the sheath assembly 20 drives the sheath adjustment component to move in the axial direction, and the sheath adjustment component correspondingly drives the axial adjustment sleeve 14 to move in the axial direction and causes the elastic member 13 to deform adaptively, that is, the sheath assembly 20 adaptively moves axially freely under the elastic force of the elastic member 13, thereby realizing stepless automatic position adjustment. It can be seen that the sheath assembly 20 can be adjusted in two modes, that is, the sheath 21 can be adjusted manually and the sheath 21 can be adjusted steplessly and automatically, thereby performing the grinding operation more efficiently and safely and improving product performance.

[0069] See also Figure 1 and Figure 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, and the connecting tube 22 is sleeved on the outside of the outer knife assembly 30, and the proximal end of the connecting tube 22 is connected and fixed to the movable sleeve 16.

[0070] See also Figure 2 and Figure 3 Optionally, the outer knife assembly 30 includes an outer knife tube. The outer knife tube is arranged inside the connecting tube 22 and inside the second support sleeve 114, and the outer knife tube is connected and fixed to the inner wall of the second support sleeve 114.

[0071] See also Figures 1 to 3 Optionally, the inner knife assembly 40 includes a grinding head 41 and an inner knife rod 42. The grinding head 41 is connected to the inner knife rod 42, and the inner knife rod 42 is connected to the connecting shaft 50.

[0072] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0073] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0074] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0075] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0076] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, 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 embodiment.

[0077] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned 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.

[0078] The above-described embodiments merely represent several implementation methods of the present application. 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 a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A sheath stepless adjustment mechanism connected to a sheath assembly, characterized in that: include: handle assembly; an unlocking limiter, rotatably disposed on the handle assembly, the unlocking limiter having a locking position and an unlocking position, and the unlocking limiter being rotatable between the locking position and the unlocking position; An axial adjustment sleeve is provided on the handle assembly and is movable in the axial direction, and the axial adjustment sleeve cooperates with the unlocking limiter; an elastic member connected to the axial adjustment sleeve; A sheath adjustment assembly, one end of which is connected to the axial adjustment sleeve and the other end is connected to the sheath assembly; wherein, when the unlocking limiter rotates to the unlocking position, the sheath adjustment assembly drives the axial adjustment sleeve to move in the axial direction and causes the elastic member to adaptively deform, so as to steplessly adjust the axial position of the sheath assembly; when the unlocking limiter rotates to the locking position, the axial adjustment sleeve is axially locked; The sheath adjustment assembly includes a manual adjustment shell and a movable sleeve; the manual adjustment shell is rotatably mounted on the outside of the axial adjustment sleeve, and the manual adjustment shell is relatively fixed to the axial adjustment sleeve in the axial direction; the movable sleeve is arranged inside the manual adjustment shell, and the movable sleeve is used to connect with the sheath assembly, and the manual adjustment shell is connected to the movable sleeve, and when the manual adjustment shell rotates, it can drive the movable sleeve to adjust the position along the axial direction; when the manual adjustment shell does not rotate, the movable sleeve is relatively fixed to the manual adjustment shell in the axial direction.

2. The sheath stepless adjustment mechanism according to claim 1, characterized in that: The unlocking limit body includes an unlocking limit sleeve, the distal end of the unlocking limit sleeve is provided with a first movable recess extending in the circumferential direction and a second movable recess extending in parallel with the axial direction thereof, the first movable recess is connected to the second movable recess on the first side along the circumferential direction and is arranged corresponding to the unlocking position, and the first movable recess is arranged corresponding to the locking position on the second side along the circumferential direction; the proximal end of the axial adjustment sleeve is provided with a limit member, and the limit member can move along the first movable recess and can move along the second movable recess.

3. The sheath stepless adjustment mechanism according to claim 2, characterized in that: A first annular groove is formed on the handle body assembly along its circumferential direction, and a first flange is provided on the inner wall of the unlocking limit sleeve, and the first flange can be movably arranged in the first annular groove; and / or a second annular groove is provided on the inner wall of the unlocking limit sleeve along its circumferential direction, and a second flange is provided on the handle body assembly, and the second flange can be movably arranged in the second annular groove.

4. The sheath stepless adjustment mechanism according to claim 3, characterized in that: The handle body assembly includes a handle body main body, a first support sleeve and a second support sleeve; the first support sleeve is fixedly mounted on the inside of the handle body main body, and the distal end of the first support sleeve extends to the outside of the handle body main body; the unlocking limit sleeve is rotatably mounted on the distal end of the first support sleeve; the second support sleeve is fixedly mounted on the inside of the first support sleeve, and the distal end of the second support sleeve extends to the outside of the first support sleeve, and the axial adjustment sleeve is movably arranged on the second support sleeve along the axial direction; the elastic member is a spring, and the spring is mounted on the outside of the second support sleeve, and the opposite ends of the elastic member are respectively in contact with the proximal end of the axial adjustment sleeve and the first support sleeve.

5. The sheath stepless adjustment mechanism according to claim 1, characterized in that: The adjustment mechanism further includes an outer cover, which is arranged outside the unlocking limiter and is connected to the unlocking limiter; the outer cover can also be rotatably arranged outside the proximal end of the axial adjustment sleeve and the proximal end of the sheath adjustment component.

6. The sheath stepless adjustment mechanism according to claim 5, characterized in that: The adjustment mechanism further includes an elastic sleeve sleeved on the outside of the handle assembly; A first alignment mark is provided on the outer cover, and a second alignment mark corresponding to the first alignment mark is provided on the outer wall of the handle body assembly.

7. The sheath stepless adjustment mechanism according to claim 1, characterized in that: The proximal end of the axial adjustment sleeve extends out of the exterior of the manual adjustment shell and into the interior of the unlocking limiter.

8. The sheath stepless adjustment mechanism according to claim 7, characterized in that: A spiral third guide portion is formed on the inner wall of the manual adjustment shell, a fourth guide portion is provided on the outer wall of the movable sleeve, and a sliding groove extending parallel to the axial direction is formed on the side wall of the axial adjustment sleeve. The fourth guide portion can be slidably inserted into the sliding groove, and the fourth guide portion also cooperates with the third guide portion.

9. The sheath stepless adjustment mechanism according to claim 1, characterized in that: The sheath stepless adjustment mechanism also includes a limiting shell, which is detachably mounted on the distal end of the axial adjustment sleeve. The limiting shell and the distal end of the sheath adjustment component abut and cooperate with each other in the axial direction. A protrusion is provided on the outer wall of the axial adjustment sleeve, and the protrusion abuts and cooperates with the proximal end of the sheath adjustment component in the axial direction.

10. A medical grinding device, characterized in that: The medical grinding device includes the sheath stepless adjustment mechanism as described in any one of claims 1 to 9, and also includes a sheath assembly, an outer knife assembly, an inner knife assembly and a connecting shaft; the sheath assembly is sleeved on the outside of the outer knife assembly, the proximal end of the sheath assembly is connected to the sheath adjustment assembly, the outer knife assembly is fixedly connected to the handle body assembly, the inner knife assembly is rotatably inserted into the interior of the outer knife assembly, the inner knife assembly is connected to the connecting shaft, and the connecting shaft is used to be connected to the power shaft of the motor.

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