Depth limiting device and bone drill

Abstract

The utility model is applicable to the technical field of medical instruments, and provides a depth limiting device and a bone drill, and the depth limiting device comprises a limiting sleeve, an adjusting sleeve and a locking mechanism. The bone drill comprises a bone drill body and the depth limiting device. Compared with a depth limiting device in the prior art, the locking mechanism is movably connected to one of the limiting sleeve and the adjusting sleeve, and after the positions of the limiting sleeve and the adjusting sleeve are adjusted in place, the locking mechanism or a part of the locking mechanism can be moved to abut against the other one of the limiting sleeve and the adjusting sleeve, so that the depth limiting device is convenient to use. According to the bone drill, connection between the limiting sleeve and the adjusting sleeve is enhanced, so that the situation that the bone drill shakes due to the fact that a radial gap exists between the adjusting sleeve and the limiting sleeve in the drilling process can be avoided, connection of the limiting sleeve and the adjusting sleeve in the radial direction is more stable, and the drilling accuracy is improved; and the area of a wound surface of a patient is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical instruments, and in particular relates to a depth limiting device and a bone drill. Background Art

[0002] When treating neurological diseases through neurosurgery, it is usually necessary to drill a hole in the skull to establish a positioning channel between the instrument and the patient. At present, in the process of drilling, in order to prevent the doctor from not being able to accurately grasp the drilling depth during drilling, a depth limiting device is usually needed to assist the doctor. However, most of the existing depth limiting devices currently use a threaded adjustment part and a limiting part, and the maximum drilling depth is limited by the step surface formed by the two. However, there will be a gap in the radial direction between the adjustment part and the limiting part of such a depth limiting device, resulting in instability of the adjustment part during the drilling process, and the shaking of the bone drill will expand the diameter of the drill hole, thereby affecting the drilling accuracy of the bone drill and causing the patient's trauma surface to increase. Utility Model Content

[0003] The utility model aims to provide a depth limiting device and a bone drill, aiming to solve the technical problem in the prior art that a radial gap between an adjusting part and a limiting part of the depth limiting device causes the bone drill to shake during drilling and affects the drilling accuracy.

[0004] The utility model is implemented as follows: in the first aspect, a depth limiting device is provided for adjusting the depth of a drilling hole, comprising a limiting sleeve, an adjusting sleeve and a locking mechanism, wherein one end of the adjusting sleeve is threadedly connected to the limiting sleeve, and the other end of the adjusting sleeve is located outside the limiting sleeve, the locking mechanism is movably connected to one of the limiting sleeve and the adjusting sleeve, and the locking mechanism can abut against the other of the limiting sleeve and the adjusting sleeve to limit radial movement of the adjusting sleeve and the limiting sleeve.

[0005] In an optional embodiment, the locking mechanism includes a locking block, which is movably connected to the adjusting sleeve. The locking block has freedom along a first direction relative to the adjusting sleeve, and the first direction is the axial direction of the adjusting sleeve. The locking block is used to abut against the limiting sleeve to limit radial movement of the limiting sleeve and the adjusting sleeve.

[0006] In an optional embodiment, the locking block is sleeved on the outside of the adjusting sleeve, and the outer wall of the adjusting sleeve and the locking block are threadedly connected.

[0007] In an optional embodiment, the locking mechanism includes a sliding block and a driving unit, the sliding block is slidably connected to the limiting sleeve, and the driving unit is used to drive the sliding block to abut against the adjusting sleeve to limit radial movement of the limiting sleeve and the adjusting sleeve.

[0008] In an optional embodiment, the driving unit includes a rotating pin and a driving member, the rotating pin is rotatably connected to the limiting sleeve, the driving member is movably connected to the limiting sleeve and has a degree of freedom along the axis of the rotating pin relative to the rotating pin, the first end of the driving member is threadedly connected to the rotating pin, and the second end of the driving member abuts against the sliding block.

[0009] In an optional embodiment, the sliding direction of the sliding block is arranged along the radial direction of the limiting sleeve, the axial direction of the rotating pin is parallel to the axial direction of the limiting sleeve, and a conduction structure for changing the force conduction direction is arranged between the second end of the driving member and the sliding block.

[0010] In an optional embodiment, the conductive structure includes a first inclined surface arranged on the second end of the driving member, and a second inclined surface arranged on the sliding block, and the first inclined surface movably abuts against the second inclined surface.

[0011] In an optional embodiment, the limiting sleeve is further provided with a mounting hole, at least a portion of the rotating pin is accommodated in the mounting hole, the limiting sleeve is detachably provided with a clamping piece, the rotating pin is also provided with a clamping groove, one end of the clamping piece is clamped in cooperation with the clamping groove, and the clamping groove is circumferentially arranged around the rotating pin.

[0012] In an optional embodiment, a first channel and a second channel are provided on the limiting sleeve, and the limiting sleeve also has a working channel for passing a bone drill, the first channel is arranged along the radial direction of the limiting sleeve, the second channel is parallel to the axial direction of the limiting sleeve, one end of the first channel is connected to the working channel, the other end of the first channel is connected to the second channel, one end of the second channel is open, the sliding block is slidably arranged in the first channel, and the driving member is slidably arranged in the second channel.

[0013] In a second aspect, a bone drill is provided, comprising a drill rod and any one of the depth limiting devices described above, wherein the drill rod is inserted into the limiting sleeve and the adjusting sleeve.

[0014] The technical effect of the utility model relative to the prior art is that when in use, the limiting sleeve is fixed by the end device of the surgical robot so that the position of the limiting sleeve is relatively fixed with the patient, and then the drilling depth is adjusted by rotating the adjusting sleeve. After the positions of the limiting sleeve and the adjusting sleeve are adjusted in place, the limiting sleeve and the adjusting sleeve are fixed by the locking mechanism. Compared with the depth limiting device in the prior art, the depth limiting device of the utility model is provided with a locking mechanism, and the locking mechanism is movably connected to one of the limiting sleeve and the adjusting sleeve. After the positions of the limiting sleeve and the adjusting sleeve are adjusted in place, the locking mechanism or a part of the locking mechanism can be moved to abut against the other of the limiting sleeve and the adjusting sleeve, thereby strengthening the connection between the limiting sleeve and the adjusting sleeve, thereby avoiding the radial gap between the adjusting sleeve and the limiting sleeve and shaking during the drilling process, causing the bone drill to shake, making the connection between the limiting sleeve and the adjusting sleeve in the radial direction more stable, improving the accuracy of drilling, and reducing the area of ​​the patient's wound surface.

[0015] It can be understood that the beneficial effects of the second aspect mentioned above can be found in the relevant description of the first aspect mentioned above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments of the utility model or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of the use state of the depth limiting device provided in the embodiment of the utility model;

[0018] Figure 2 It is a structural schematic diagram of a depth limiting device provided by an embodiment of the utility model;

[0019] Figure 3 It is a cross-sectional structural schematic diagram of a depth limiting device provided by an embodiment of the utility model;

[0020] Figure 4 It is a structural schematic diagram of an adjusting sleeve used in one embodiment of the utility model;

[0021] Figure 5 is a schematic cross-sectional structural diagram of a depth limiting device provided by another embodiment of the utility model;

[0022] Figure 6 yes Figure 5 Schematic diagram of the enlarged structure at point A in the middle.

[0023] Explanation of the accompanying drawings: 1. Limit sleeve; 2. Adjustment sleeve; 3. Locking mechanism; 31. Locking block; 32. Sliding block; 33. Driving unit; 331. Rotating pin; 332. Driving member; 34. Conduction structure; 341. First inclined surface; 342. Second inclined surface; 4. Mounting hole; 5. Clamping member; 6. First channel; 7. Second channel; 8. Drill rod; 9. Robot; 10. Working channel. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0025] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do 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 the present invention.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0027] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0029] Please refer to Figure 1 , Figure 2 and Figure 5 As shown, in an embodiment of the utility model, in the first aspect, a depth limiting device is provided, including a limiting sleeve 1, an adjusting sleeve 2 and a locking mechanism 3, one end of the adjusting sleeve 2 is threadedly connected to the limiting sleeve 1, and the other end of the adjusting sleeve 2 is located outside the limiting sleeve 1, the locking mechanism 3 is movably connected to one of the limiting sleeve 1 and the adjusting sleeve 2, and the locking mechanism 3 can be abutted against the other of the limiting sleeve 1 and the adjusting sleeve 2 to limit the radial movement of the adjusting sleeve 2 and the limiting sleeve 1.

[0030] Specifically, the limiting sleeve 1 and the adjusting sleeve 2 are both components with an installation channel inside, wherein the limiting sleeve 1 and the adjusting sleeve 2 are generally coaxially arranged to facilitate the bone drill to pass through the limiting sleeve 1 and the adjusting sleeve 2. At the same time, one end of the adjusting sleeve 2 is threadedly connected to the limiting sleeve 1, and the adjusting sleeve 2 can be moved axially relative to the limiting sleeve 1 through the relative rotation between the adjusting sleeve 2 and the limiting sleeve 1. The limiting sleeve 1 can be kept fixed relative to the patient by the end of the surgical robot. Under the premise that the position of the limiting sleeve 1 remains fixed, the working end of the bone drill sequentially passes through the adjusting sleeve 2 and the limiting sleeve 1 and contacts the patient, and when the bone drill drills to the deepest position, when the bone drill drills to the deepest position, the end of the adjusting sleeve 2 close to the limiting sleeve 1 will abut against the limiting sleeve 1 to prevent the adjusting sleeve 2 from continuing to move along the axial direction of the limiting sleeve 1, thereby preventing the bone drill from continuing to approach the patient, thereby achieving the purpose of limiting the drilling depth. At this time, the drilling depth can be controlled by adjusting the position of the above-mentioned adjusting sleeve 2. In addition, a locking mechanism 3 is also provided between the limiting sleeve 1 and the adjusting sleeve 2. The locking mechanism 3 can be a single component or a combination of multiple components. The locking mechanism 3 is movably connected to one of the limiting sleeve 1 and the adjusting sleeve 2. After the positions of the limiting sleeve 1 and the adjusting sleeve 2 are adjusted in place, the locking mechanism 3 or a part of the locking mechanism 3 can be moved to abut against the other of the limiting sleeve 1 and the adjusting sleeve 2, thereby realizing the connection between the limiting sleeve 1 and the adjusting sleeve 2 and preventing radial relative shaking between the two.

[0031] The depth limiting device provided by the embodiment of the utility model is used to fix the limiting sleeve 1 so that the position of the limiting sleeve 1 and the patient remain relatively fixed, and then the drilling depth is adjusted by rotating the adjusting sleeve 2. After the positions of the limiting sleeve 1 and the adjusting sleeve 2 are adjusted in place, the limiting sleeve 1 and the adjusting sleeve 2 are fixed by the locking mechanism 3. Compared with the depth limiting device in the prior art, by providing the locking mechanism 3, at least a part of the locking mechanism 3 is movably connected to one of the limiting sleeve 1 and the adjusting sleeve 2. After the positions of the limiting sleeve 1 and the adjusting sleeve 2 are adjusted in place, the locking mechanism 3 or a part of the locking mechanism 3 can be moved to abut against the other of the limiting sleeve 1 and the adjusting sleeve 2. Thereby, the connection between the limiting sleeve 1 and the adjusting sleeve 2 is strengthened, so that the radial gap between the adjusting sleeve 2 and the limiting sleeve 1 can be avoided during the drilling process, which causes the bone drill to shake. The connection between the limiting sleeve 1 and the adjusting sleeve 2 in the radial direction is made more stable. The drilling accuracy is improved and the area of ​​the patient's trauma surface is reduced.

[0032] The detailed structure of the locking mechanism 3 is illustrated below. It should be noted that the locking mechanism 3 can be implemented in a variety of ways, including but not limited to the structures listed below.

[0033] In one embodiment, Figure 2 As shown, the locking mechanism 3 includes a locking block 31, which is movably connected to the adjusting sleeve 2. The locking block 31 has a degree of freedom along a first direction relative to the adjusting sleeve 2, and the first direction is the axial direction of the adjusting sleeve 2. The locking block 31 is used to abut against the limiting sleeve 1 to limit the radial movement of the limiting sleeve 1 and the adjusting sleeve 2. Specifically, the locking block 31 refers to a block component with a certain volume, which can be a block, a plate, or a combination of multiple shapes. The locking block 31 is movably set on the adjusting sleeve 2, and the locking block 31 has a degree of freedom along the first direction relative to the adjusting sleeve 2, and the locking block 31 and the adjusting sleeve 2 remain relatively fixed along the radial direction of the adjusting sleeve 2.

[0034] After the relative positions of the limiting sleeve 1 and the adjusting sleeve 2 are adjusted in place, the position of the locking block 31 on the adjusting sleeve 2 can be adjusted along the first direction so that the locking block 31 is pressed against the limiting sleeve 1. The friction between the locking block 31 and the limiting sleeve 1 can keep the locking block 31 relatively fixed with the limiting sleeve 1, so that the limiting sleeve 1 and the adjusting sleeve 2 can also be kept fixed, so as to avoid the shaking of the adjusting sleeve 2 relative to the limiting sleeve 1. And when the position of the adjusting sleeve 2 needs to be adjusted again, the locking block 31 can be moved in the opposite direction along the first direction so that the locking block 31 is separated from the limiting sleeve 1, and the adjusting sleeve 2 can be rotated relative to the limiting sleeve 1. The locking mechanism 3 adopts the locking block 31, which has a simple structure, saves manufacturing costs, and is convenient and quick to operate.

[0035] It should be noted that, since one end of the adjusting sleeve 2 is threadedly connected in the limiting sleeve 1, when the locking block 31 approaches the limiting sleeve 1 along the first direction, it will abut against the end face of the limiting sleeve 1. In order to ensure the friction between the locking block 31 and the limiting sleeve 1, the end face of the limiting sleeve 1 and the side face of the locking block 31 close to the limiting sleeve 1 can be flat, which can increase the contact area when the two abut, thereby increasing the friction.

[0036] In one embodiment, Figure 3 As shown, the locking block 31 is sleeved on the outside of the adjusting sleeve 2, and the outer wall of the adjusting sleeve 2 and the locking block 31 are threadedly connected. Specifically, the locking block 31 is sleeved on the outside of the adjusting sleeve 2, which means that a through hole is provided on the locking block 31, and the adjusting sleeve 2 is penetrated in the through hole on the locking block 31. The threaded connection between the outer wall of the adjusting sleeve 2 and the locking block 31 means that threads are provided on the outer wall of the adjusting sleeve 2 and the inner wall of the through hole. After the locking block 31 is sleeved on the outside of the adjusting sleeve 2, the adjusting sleeve 2 and the locking block 31 are connected by threads. When the position of the locking block 31 needs to be adjusted along the first direction, the locking block 31 can be moved relative to the adjusting sleeve 2 along the first direction under the action of the threads by rotating the locking block 31. On the premise of ensuring that the locking block 31 and the adjusting sleeve 2 are firmly installed, the position adjustment of the locking block 31 can also be made more convenient and quick.

[0037] In addition, the locking block 31 is installed by being sleeved on the outside of the adjusting sleeve 2 and being threadedly connected to the adjusting sleeve 2, so that the rotation direction of the locking block 31 and the rotation direction of the adjusting sleeve 2 are both around the axial direction of the adjusting sleeve 2. In this way, when the operator adjusts the position of the adjusting sleeve 2 and the locking block 31, he only needs to move the hand position to complete the two adjustment operations, which reduces the hand movement range and improves the adjustment efficiency.

[0038] In an optional embodiment, if Figure 4As shown, the thread between the adjusting sleeve 2 and the limiting sleeve 1 is a first thread, and the thread between the adjusting sleeve 2 and the locking block 31 is a second thread. The spiral direction of the first thread and the spiral direction of the second thread can be opposite, and when the locking block 31 and the limiting sleeve 1 abut against each other, the risk of the limiting sleeve 1 and the locking block 31 moving relative to the adjusting sleeve 2 at the same time can be avoided to a certain extent.

[0039] In an optional embodiment, if Figure 2 As shown, at least a portion of the locking block 31 is protruded from the limiting sleeve 1 in the radial direction of the adjusting sleeve 2. Specifically, at least a portion of the locking block 31 is protruded from the limiting sleeve 1 in the radial direction of the adjusting sleeve 2, which can avoid, to a certain extent, that the operator's hand is blocked by the limiting sleeve 1 when the locking block 31 is close to the limiting sleeve 1, and can make the contact between the operator's hand and the locking block 31 more convenient.

[0040] Among them, Figure 2 As shown, an anti-slip structure may be further provided on the portion of the locking block 31 protruding from the limiting sleeve 1 , which may increase the friction between the locking block 31 and the hand and avoid slipping when the locking block 31 is rotated.

[0041] In an optional embodiment, if Figure 2 As shown, the locking block 31 can be made of metal or plastic, as long as the strength meets the requirements and complies with the hygiene standards.

[0042] As another embodiment of the locking mechanism 3, Figure 5 and Figure 6 As shown, the locking mechanism 3 includes a sliding block 32 and a driving unit 33, the sliding block 32 is slidably connected to the limiting sleeve 1, and the driving unit 33 is used to drive the sliding block 32 to abut against the adjusting sleeve 2 to limit the radial movement of the limiting sleeve 1 and the adjusting sleeve 2. Specifically, the sliding block 32 refers to a component with a certain volume, and the sliding block 32 is slidably connected to the limiting sleeve 1. The driving unit 33 refers to a component or assembly used to drive the sliding block 32 to approach the adjusting sleeve 2. After the positions of the adjusting sleeve 2 and the limiting sleeve 1 are adjusted in place, the driving unit 33 can be used to drive the sliding block 32 to approach and abut against the adjusting sleeve 2, thereby strengthening the installation of the adjusting sleeve 2 and preventing the adjusting sleeve 2 from shaking during the operation of the bone drill. And when the adjusting sleeve 2 and the limiting sleeve 1 need to be adjusted again, the sliding block 32 can be loosened by the driving unit 33, and the sliding block 32 no longer abuts against the adjusting sleeve 2, so that the adjusting sleeve 2 can move by its own rotation. The locking mechanism 3 adopts a mode in which the sliding block 32 and the driving unit 33 cooperate with each other, so that the locking mechanism 3 is more convenient to use.

[0043] In an optional embodiment, if Figure 6As shown, the end of the sliding block 32 close to the adjusting sleeve 2 is provided with an abutting surface for abutting against the adjusting sleeve 2, wherein the abutting surface can be arc-shaped, elliptical or spherical. The abutting surface can make the part of the sliding block 32 that contacts the adjusting sleeve 2 smoother, and can prevent the sliding block 32 from scratching the outside of the adjusting sleeve 2 to a certain extent, play a role in protecting the external thread of the adjusting sleeve 2, so that the use of the entire locking mechanism 3 is safer and more reliable.

[0044] In one embodiment, Figure 6 As shown, the driving unit 33 includes a rotating pin 331 and a driving member 332, the rotating pin 331 is rotatably connected to the limiting sleeve 1, the driving member 332 is movably connected to the limiting sleeve 1 and has a degree of freedom along the axis direction of the rotating pin 331 relative to the rotating pin 331, the first end of the driving member 332 is threadedly connected to the rotating pin 331, and the second end of the driving member 332 abuts on the sliding block 32. Specifically, the rotating pin 331 refers to a columnar component with a certain length dimension, and the driving member 332 refers to a component with a certain length dimension. Among them, the rotating pin 331 is rotatably set on the limiting sleeve 1 and one end is located outside the limiting sleeve 1, the first end of the driving member 332 is threadedly connected to the rotating pin 331, and the second end of the driving member 332 abuts on the sliding block 32. Since the driving member 332 has a degree of freedom along the axis direction of the rotating pin 331 relative to the rotating pin 331, and the first end of the driving member 332 is threadedly connected to the rotating pin 331. Since the rotating pin 331 is rotatably connected to the limiting sleeve 1, the rotating pin 331 can only rotate around its own axis, but cannot be displaced in the direction along the axis of the rotating pin 331. At the same time, the driving member 332 has a degree of freedom along the axis of the rotating pin 331. When the rotating pin 331 rotates, the driving member 332 will not rotate with the rotating pin 331. At this time, when the rotating pin 331 is driven to rotate, relative rotation will occur between the rotating pin 331 and the driving member 332. Since the first end of the driving member 332 is threadedly connected to the rotating pin 331, when the two rotate relative to each other, the driving member 332 can convert the rotation of the rotating pin 331 into a linear motion of the driving member 332 along the axis of the rotating pin 331 under the action of the thread. After the positions of the adjusting sleeve 2 and the limiting sleeve 1 are adjusted to the right position, the driving member 332 can be driven to move by the rotation of the rotating pin 331, and the second end of the driving member 332 abuts against the sliding block 32. After the driving member 332 moves, it will push the sliding block 32 to move in the direction close to the adjusting sleeve 2, and finally achieve the purpose of the sliding block 32 abutting against the adjusting sleeve 2. Based on the above structure, the driving unit 33 can convert the rotation of the rotating pin 331 into the linear motion of the sliding block 32, which can make the sliding block 32 more convenient to slide, and can also save the space occupied by the driving unit 33 as a whole, thereby reducing the volume required for the limiting sleeve 1 as a whole.

[0045] The first end of the driving member 332 is threadedly connected to the rotating pin 331. A receiving hole may be provided at the end of the rotating pin 331, the first end of the driving member 332 extends into the receiving hole, and threads are provided on the side wall of the receiving hole and the first end of the driving member 332. Alternatively, a receiving hole may be provided at the first end of the driving member 332, one end of the rotating pin 331 extends into the receiving hole, and threads are provided on the side wall of the receiving hole and the outside of the rotating pin 331. Of course, the driving member 332 is threadedly connected to the rotating pin 331, and other structural methods may be used, which will not be described in detail here.

[0046] like Figure 6 As shown, in order to facilitate the operator to rotate the rotating pin 331, the rotating pin 331 can be located at one end outside the limiting sleeve 1 and the other end inside the limiting sleeve 1, so that the operator can realize the overall rotation of the rotating pin 331 by twisting the end of the rotating pin 331; the rotating pin 331 can also be located as a whole inside the limiting sleeve 1, but a twisting component connected to the rotating pin 331 is extended to the outside of the limiting sleeve 1, and the operator drives the rotating pin 331 to rotate as a whole by twisting the twisting component, which can make the rotation of the rotating pin 331 more convenient and quick.

[0047] In one embodiment, Figure 6 As shown, the sliding direction of the sliding block 32 is arranged along the radial direction of the limiting sleeve 1, the axial direction of the rotating pin 331 is parallel to the axial direction of the limiting sleeve 1, and a conducting structure 34 for changing the force conduction direction is arranged between the second end of the driving member 332 and the sliding block 32. Specifically, when the sliding block 32 approaches the adjusting sleeve, the sliding block 32 slides along the radial direction of the limiting sleeve 1, which can make the sliding path of the sliding block 32 shorter. The axial direction of the rotating pin 331 is parallel to the axial direction of the limiting sleeve 1, so that the rotation axis of the rotating pin 331 is parallel to the rotation axis of the adjusting sleeve 2, so that when the operator rotates the rotating pin 331 after adjusting the position of the adjusting sleeve 2, only the hand position needs to be translated, and no other flipping action of the hand is required, which reduces the movement amplitude of the hand and makes the use of the driving unit 33 more convenient. At the same time, a conducting structure 34 is arranged between the second end of the driving member 332 and the sliding block 32. When the movement directions of the driving member 332 and the sliding block 32 are different, the axial sliding of the driving member 332 along the rotating pin 331 can be converted into the radial sliding of the sliding block 32 along the limiting sleeve 1, so that the use of the entire locking mechanism 3 is more convenient.

[0048] In an optional embodiment, if Figure 5 As shown, the sliding block 32, the driving member 332 and the rotating pin 331 can be made of metal or plastic, as long as the strength meets the requirements and the washing and elimination requirements are met.

[0049] In one embodiment, Figure 6 As shown, the conducting structure 34 includes a first inclined surface 341 disposed on the second end of the driving member 332, and a second inclined surface 342 disposed on the sliding block 32, and the first inclined surface 341 is movably abutted against the second inclined surface 342. Specifically, the first inclined surface 341 refers to an inclined plane that is set at an angle to the moving direction of the driving member 332, and the second inclined surface 342 refers to an inclined plane that is set at an angle to the moving direction of the sliding block 32, and the first inclined surface 341 and the second inclined surface 342 are parallel to each other. The first inclined surface 341 and the second inclined surface 342 abut against each other, and because the radial direction of the limiting sleeve 1 and the axial direction of the rotating pin 331 are parallel to each other, when the driving block moves under the action of the rotating pin 331, a force along the radial direction of the limiting sleeve 1 and a force along the axial direction of the rotating pin 331 are applied to the second inclined surface 342 on the sliding block 32 through the first inclined surface 341, thereby driving the sliding block 32 to slide along the radial direction of the limiting sleeve 1. The configuration of the conductive structure 34 can make the configuration of the sliding block 32 and the driving unit 33 more flexible.

[0050] In order to facilitate the arrangement of the first inclined surface 341 , a driving block is arranged on the second end of the driving member 332 , and the first inclined surface 341 is arranged on a side of the driving block close to the sliding block 32 .

[0051] In one embodiment, Figure 6 As shown, the limiting sleeve 1 is also provided with a mounting hole 4, at least a part of the rotating pin 331 is accommodated in the mounting hole 4, the limiting sleeve 1 is detachably provided with a clamping member 5, the rotating pin 331 is also provided with a clamping groove, one end of the clamping member 5 is clamped and matched with the clamping groove, and the clamping groove is arranged around the circumference of the rotating pin 331. Specifically, the clamping member 5 refers to a component with a certain length, the clamping member 5 is arranged to penetrate the side wall of the mounting hole 4 and one end is located in the mounting hole 4. The mounting hole 4 refers to a hole structure with a certain depth, at least a part of the rotating pin 331 is rotatably arranged in the mounting hole 4, which means that the rotating pin 331 can be fully accommodated in the mounting hole 4, or only a part of it can be accommodated in the mounting hole 4. After the rotating pin 331 is installed in the interior of the mounting hole 4, the clamping member 5 can also be installed on the limiting sleeve 1, and one end of the clamping member 5 is located in the mounting hole 4. Since the rotating pin 331 is also provided with a clamping groove for accommodating the avoidance clamping member 5, the end of the clamping member 5 will also extend into the clamping groove. At the same time, since the clamping groove is arranged around the circumference of the rotating pin 331, the rotating pin 331 can be prevented from falling out of the mounting hole 4 by the arrangement of the clamping groove and the clamping member 5 without affecting the rotation of the rotating pin 331, so that the installation of the rotating pin 331 is more stable and reliable.

[0052] In an optional embodiment, if Figure 6As shown, the clamping member 5 can be a pin or a fastening screw, and a clamping hole for installing the clamping member 5 is provided on the limiting sleeve 1. The axis of the clamping member 5 is perpendicular to the axis of the mounting hole 4. When the clamping member 5 is a pin, the pin realizes the detachable connection of the clamping member 5 by a tight fit connection with the clamping hole. When the clamping member 5 is a fastening screw, a thread is also provided on the inner wall of the clamping hole, and the clamping member 5 realizes the detachable installation of the clamping member 5 by cooperating with the inner wall thread of the clamping hole.

[0053] In one embodiment, Figure 5 As shown, the limiting sleeve 1 is provided with a first channel 6 and a second channel 7, and the limiting sleeve 1 also has a working channel 10 for the bone drill to pass through, the first channel 6 is provided along the radial direction of the limiting sleeve 1, the second channel 7 is parallel to the axial direction of the limiting sleeve 1, one end of the first channel 6 is connected to the working channel 10, the other end of the first channel 6 is connected to the second channel 7, one end of the second channel 7 is open, the sliding block 32 is slidably arranged in the first channel 6, and the driving member 332 is slidably arranged in the second channel 7. Specifically, in order to provide sufficient space for installing the locking mechanism 3, the side wall of the limiting sleeve 1 at one end close to the adjusting sleeve 2 has sufficient thickness. At the same time, the first channel 6 is provided on the limiting sleeve 1 to accommodate the sliding block 32, and the second channel 7 is provided on the limiting sleeve 1 to accommodate the driving member 332, and the first channel 6 and the second channel 7 are connected to each other. By setting the sliding block 32 and the driving member 332 inside the limiting sleeve 1 and only setting an opening on the second channel 7 for installing the sliding block 32 and the driving member 332, the structural surface on the outer surface of the limiting sleeve 1 can be reduced, making the outer surface of the limiting sleeve 1 smoother, avoiding the formation of cleaning dead corners on the outer surface of the limiting sleeve 1, thereby making the cleaning and disinfection of the limiting sleeve 1 more convenient.

[0054] In an optional embodiment, if Figure 2 or Figure 5 As shown, a protrusion is also provided at the end of the adjusting sleeve 2 away from the limiting sleeve 1, and the protrusion is provided in a radial direction protruding from the outer wall of the adjusting sleeve 2. The provision of the protrusion can increase the diameter size of the adjusting sleeve 2 at the end, and can make it more convenient for the operator to rotate the adjusting sleeve 2. In addition, an anti-slip structure can also be provided on the circumference of the protrusion, which can increase the friction between the hand and the protrusion and avoid slipping when rotating the adjusting sleeve 2. The anti-slip structure generally adopts a plurality of groove structures arranged along the axial direction of the adjusting sleeve 2. And the size of the groove structure should not be too small to avoid the existence of cleaning dead corners on the protrusion, which can make the cleaning and disinfection of the entire adjusting sleeve 2 more convenient.

[0055] In a second aspect, a bone drill is provided, comprising a bone drill and any one of the depth limiting devices described above, wherein the bone drill is disposed in the limiting sleeve 1 and the adjusting sleeve 2. It is understood that the beneficial effects of the second aspect described above can be found in the relevant description of the first aspect described above, and will not be repeated here.

[0056] The above are only preferred embodiments of the present invention, and only specifically describe the technical principles of the present invention. These descriptions are only for the purpose of explaining the principles of the present invention, and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanation here, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention, and other specific implementation methods of the present invention that can be associated with by technicians in this field without creative labor, should be included in the scope of protection of the present invention.

Claims

1. A depth limiting device, characterized in that: The invention comprises a limiting sleeve (1), an adjusting sleeve (2) and a locking mechanism (3), wherein one end of the adjusting sleeve (2) is threadedly connected to the limiting sleeve (1), and the other end of the adjusting sleeve (2) is located outside the limiting sleeve (1); the locking mechanism (3) is movably connected to one of the limiting sleeve (1) and the adjusting sleeve (2), and the locking mechanism (3) can abut against the other of the limiting sleeve (1) and the adjusting sleeve (2) to limit the radial movement of the adjusting sleeve (2) and the limiting sleeve (1).

2. The depth limiting device according to claim 1, characterized in that: The locking mechanism (3) comprises a locking block (31), the locking block (31) being movably connected to the adjusting sleeve (2), the locking block (31) having a degree of freedom along a first direction relative to the adjusting sleeve (2), the first direction being the axial direction of the adjusting sleeve (2), the locking block (31) being used to abut against the limiting sleeve (1) to limit radial movement of the limiting sleeve (1) and the adjusting sleeve (2).

3. The depth limiting device according to claim 2, characterized in that: The locking block (31) is sleeved on the outside of the adjusting sleeve (2), and the outer wall of the adjusting sleeve (2) and the locking block (31) are threadedly connected.

4. The depth limiting device according to claim 1, characterized in that: The locking mechanism (3) comprises a sliding block (32) and a driving unit (33); the sliding block (32) is slidably connected to the limiting sleeve (1); and the driving unit (33) is used to drive the sliding block (32) to abut against the adjusting sleeve (2) to limit radial movement of the limiting sleeve (1) and the adjusting sleeve (2).

5. The depth limiting device according to claim 4, characterized in that: The driving unit (33) comprises a rotating pin (331) and a driving member (332); the rotating pin (331) is rotatably connected to the limiting sleeve (1); the driving member (332) is movably connected to the limiting sleeve (1) and has a degree of freedom along the axis of the rotating pin (331) relative to the rotating pin (331); a first end of the driving member (332) is threadedly connected to the rotating pin (331), and a second end of the driving member (332) abuts against the sliding block (32).

6. The depth limiting device according to claim 5, characterized in that: The sliding direction of the sliding block (32) is arranged along the radial direction of the limiting sleeve (1), the axial direction of the rotating pin (331) is parallel to the axial direction of the limiting sleeve (1), and a conduction structure (34) for changing the force conduction direction is arranged between the second end of the driving member (332) and the sliding block (32).

7. The depth limiting device according to claim 6, characterized in that: The conductive structure (34) comprises a first inclined surface (341) arranged on the second end of the driving member (332), and a second inclined surface (342) arranged on the sliding block (32), wherein the first inclined surface (341) is movably abutted against the second inclined surface (342).

8. The depth limiting device according to claim 5, characterized in that: The limiting sleeve (1) is also provided with a mounting hole (4), and at least a portion of the rotating pin (331) is accommodated in the mounting hole (4). The limiting sleeve (1) is detachably provided with a clamping member (5), and the rotating pin (331) is also provided with a clamping groove, and one end of the clamping member (5) is clamped and matched with the clamping groove, and the clamping groove is arranged around the circumference of the rotating pin (331).

9. The depth limiting device according to claim 8, characterized in that: The limiting sleeve (1) is provided with a first channel (6) and a second channel (7). The limiting sleeve (1) also has a working channel (10) for a bone drill to pass through. The first channel (6) is arranged along the radial direction of the limiting sleeve (1), and the second channel (7) is parallel to the axial direction of the limiting sleeve (1). One end of the first channel (6) is connected to the working channel (10), and the other end of the first channel (6) is connected to the second channel (7). One end of the second channel (7) is open. The sliding block (32) is slidably arranged in the first channel (6), and the driving member (332) is slidably arranged in the second channel (7).

10. A bone drill, characterized in that: It comprises a drill rod and a depth limiting device as claimed in any one of claims 1 to 9, wherein the drill rod is inserted into the limiting sleeve (1) and the adjusting sleeve (2).

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