Bone drilling device and drill bit mounting structure

Abstract

According to the bone drilling device and the drill bit installation structure, when a drill bit needs to be replaced, a lock sleeve is moved relative to an installation sleeve till a locking piece is released, at the moment, radial abutting force of the lock sleeve to the locking piece disappears, an inner sleeve and the drill bit are pushed to move in the pulling-out direction under the action of reset force of a first elastic reset piece, and the drill bit is pulled out. When the inner sleeve moves from the second position to the first position, the outer wall of the inner sleeve abuts against and is matched with the locking piece, the locking piece retreats into the locking through hole to unlock the drill bit, then the drill bit can smoothly pop out of the inserting channel to be replaced, dismounting is convenient, and the replacing efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical instruments, in particular to a bone drilling device and a drill bit installation structure. Background Art

[0002] Bone drilling devices such as drill handsets can drill holes in bone tissue to meet clinical surgical needs. During surgery, the drill bit may need to be replaced. The traditional method is to insert the plug end of the drill bit into a three-leaf chuck, and then clamp the three-leaf chuck with a key to fix the drill bit. The traditional method requires clamping the three-leaf chuck from multiple directions. When replacing the drill bit, the three-leaf chuck needs to be loosened from multiple directions, which is cumbersome to operate and affects the efficiency of disassembly and assembly. Summary of the invention

[0003] Based on this, it is necessary to provide a bone drilling device and a drill bit mounting structure to address the problems of troublesome operation and affected replacement efficiency.

[0004] The technical solution is as follows:

[0005] On the one hand, a drill bit mounting structure is provided, comprising:

[0006] A mounting sleeve, wherein the mounting sleeve is provided with an insertion passage for inserting a drill bit, and a locking through hole communicated with the insertion passage, and the locking through hole radially penetrates a side wall of the mounting sleeve;

[0007] An inner sleeve, the inner sleeve is disposed in the insertion passage, and the inner sleeve can reciprocate between a first position and a second position along the axial direction of the insertion passage relative to the mounting sleeve;

[0008] a first elastic return member, wherein the first elastic return member is disposed in the insertion channel, a front end of the first elastic return member abuts against the inner sleeve, and a rear end of the first elastic return member abuts against an inner wall of the insertion channel;

[0009] A locking member, wherein the locking member is at least partially disposed in the locking through hole and is capable of reciprocating along the axial direction of the locking through hole so as to partially extend into the insertion channel or retract into the locking through hole;

[0010] A locking sleeve, which is disposed outside the mounting sleeve and can reciprocate along the axial direction of the mounting sleeve;

[0011] Wherein, when the inner sleeve moves from the first position to the second position, the first elastic return member is in a compressed state, and the inner wall of the locking sleeve abuts against the locking member along the radial direction of the insertion channel, so that the locking member partially extends into the insertion channel to lock the drill bit; when the locking sleeve releases the locking member, the first elastic return member returns to the released state, so that the inner sleeve moves from the second position to the first position, and the outer wall of the inner sleeve abuts against the locking member, so that the locking member retreats into the locking through hole to unlock the drill bit.

[0012] The technical solution is further described below:

[0013] In one embodiment, the drill bit mounting structure also includes a second elastic reset member, which is arranged on the outer peripheral side of the mounting sleeve, and the second elastic reset member is arranged relative to the locking through hole away from the drill tip of the drill bit. One end of the second elastic reset member abuts against the locking sleeve, and the other end of the second elastic reset member abuts against the outer wall of the mounting sleeve. Under the action of the second elastic reset member, the locking sleeve can reciprocate between a third position and a fourth position relative to the mounting sleeve along the axial direction of the plug-in channel, so that the inner wall of the locking sleeve and the locking member are radially spaced apart along the plug-in channel or the inner wall of the locking sleeve and the locking member are radially abutted against each other along the plug-in channel.

[0014] In one embodiment, the locking sleeve is threadedly connected to the mounting sleeve so that the locking sleeve can reciprocate relative to the mounting sleeve along the axial direction of the mounting sleeve.

[0015] In one of the embodiments, an operating portion is provided on the outer side wall of the locking sleeve.

[0016] In one embodiment, the outer wall of the locking sleeve includes a first circumferential side wall and a second circumferential side wall, the outer diameter of the first circumferential side wall is greater than the outer diameter of the second circumferential side wall, and the first circumferential side wall is arranged away from the drill tip of the drill bit relative to the second circumferential side wall, and the first circumferential side wall and the second circumferential side wall cooperate to form the operating part.

[0017] In one embodiment, the inner wall of the locking sleeve is provided with a pressing portion extending radially along the insertion channel, and the pressing portion is slidably matched with the outer wall of the mounting sleeve;

[0018] Wherein, when the inner sleeve moves from the first position to the second position, the pressing portion covers the locking through hole and abuts against the locking piece along the radial direction of the insertion channel; when the inner sleeve moves from the second position to the first position, the pressing portion is located on one side of the locking through hole along the axial direction of the insertion channel so that the locking piece protrudes from the outer wall of the mounting sleeve to unlock the drill bit.

[0019] In one embodiment, a limiting portion is provided at one end of the mounting sleeve close to the drill tip of the drill bit, and when the pressing portion covers the locking through hole and cooperates with the locking member, the side of the pressing portion close to the drill tip of the drill bit cooperates with the limiting portion.

[0020] In one of the embodiments, the limiting portion is detachably connected to the mounting sleeve.

[0021] In one embodiment, the limiting portion includes a limiting clamping ring or a threaded sleeve.

[0022] In another aspect, a bone drilling device is provided, comprising:

[0023] Power handle;

[0024] The drill bit mounting structure is connected to the power handle; and

[0025] A drill bit, the drill bit comprising a first mounting portion and a second mounting portion arranged adjacent to each other, the second mounting portion being arranged away from the drill tip relative to the first mounting portion, and the outer wall of the first mounting portion being provided with a locking groove which is locked with the locking member; wherein both the first mounting portion and the second mounting portion can be inserted into the insertion channel, the second mounting portion is passed through the inner sleeve, and a boss which is in contact with the inner sleeve is provided between the first mounting portion and the second mounting portion.

[0026] In the bone drilling device and drill bit installation structure of the above embodiment, when installing the drill bit, the drill bit is inserted into the insertion channel, and the inner sleeve moves from the first position to the second position relative to the installation sleeve along the insertion direction under the action of the drill bit, and the locking sleeve moves relative to the installation sleeve until the inner wall of the locking sleeve contacts the locking member along the radial direction of the insertion channel. At this time, the inner sleeve and the locking member are staggered and separated, that is, the inner sleeve and the locking member are staggered and separated along the axial direction of the insertion channel, so that the resistance force applied by the inner sleeve to the locking member disappears, and the locking member moves to partially extend into the insertion channel under the action of gravity and / or the resistance force of the locking sleeve and stably and reliably locks with the drill bit, thereby simply and conveniently realizing the installation and fixation of the drill bit. In addition, the first elastic reset member applies a reset force along the extraction direction to the inner sleeve, so that the inner sleeve has a movement tendency along the extraction direction. When the drill bit needs to be replaced, the locking sleeve is moved relative to the mounting sleeve to release the locking piece. At this time, the radial resistance force of the locking sleeve on the locking piece disappears, and the inner sleeve and the drill bit are pushed to move in the extraction direction under the action of the reset force of the first elastic reset piece until the inner sleeve moves from the second position to the first position, so that the outer wall of the inner sleeve and the locking piece are interfered and cooperated to return the locking piece to the locking through hole to unlock the drill bit, so that the drill bit can be smoothly popped out of the plug-in channel for replacement, which is convenient for disassembly and improves replacement efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and the description thereof are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 A schematic structural diagram of a bone drilling device according to an embodiment;

[0030] Figure 2 for Figure 1 A partial enlarged view of part A of the bone drilling device;

[0031] Figure 3 for Figure 1 A schematic structural diagram of the inner sleeve of the drill bit mounting structure of the bone drilling device when it is in a first position;

[0032] Figure 4 for Figure 1 A schematic structural diagram of the bone drilling device when the inner sleeve of the drill bit mounting structure is in the second position.

[0033] Description of reference numerals:

[0034] 10. Bone drilling device; 100. Power handle; 200. Drill bit mounting structure; 210. Mounting sleeve; 211. Insertion channel; 212. Locking through hole; 213. First abutment portion; 214. Second abutment portion; 215. Guide protrusion; 220. Inner sleeve; 221. Guide groove; 230. First elastic return member; 240. Locking member; 250. Locking sleeve; 251. Operating portion; 2511. First circumferential side wall; 2512. Second circumferential side wall; 252. Pressing portion; 260. Second elastic return member; 270. Limiting portion; 300. Drill bit; 310. Drill tip; 320. First mounting portion; 321. Locking groove; 330. Second mounting portion; 340. Boss. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0036] like Figure 1 and Figure 2 As shown, in one embodiment, a bone drilling device 10 is provided, and the bone drilling device 10 includes a power handle 100, a drill bit mounting structure 200, and a drill bit 300. The power handle 100 can be held and provide power output, and the drill bit mounting structure 200 is connected to the power handle 100, so that the drill bit 300 can be quickly installed and quickly removed through the drill bit mounting structure 200, which is simple to operate and has high replacement efficiency.

[0037] It should be noted that when the drill bit 300 is assembled with the drill bit mounting structure 200, the drill bit 300 has an insertion direction (eg Figure 1 and Figure 4 B direction) and the extraction direction (as shown in Figure 1 and Figure 3 The insertion direction and the extraction direction are two opposite directions, for example, the insertion direction is from right to left, and the extraction direction is from left to right, or the insertion direction is from left to right, and the extraction direction is from right to left, which is not limited here. In addition, in the embodiment of the present application, the end of the drill tip 310 close to the drill bit 300 is called the front end, and the end of the drill tip 310 away from the drill bit 300 is called the rear end.

[0038] It should be noted that the power handle 100 may adopt an existing structure, which will not be described in detail herein.

[0039] like Figures 2 to 4 As shown, the drill bit mounting structure 200 includes a mounting sleeve 210 , an inner sleeve 220 , a first elastic reset member 230 , a locking member 240 and a locking sleeve 250 .

[0040] like Figure 3 and Figure 4 As shown, the mounting sleeve 210 may be a cylindrical structure, and the mounting sleeve 210 is provided with an insertion channel 211 extending axially, so that the drill bit 300 can be inserted into the insertion channel 211, and the mounting sleeve 210 is also provided with a locking through hole 212 connected to the insertion channel 211, and the locking through hole 212 radially penetrates the side wall of the mounting sleeve 210.

[0041] In one embodiment, the insertion channel 211 has an inlet end for inserting the drill bit 300 , and the locking through hole 212 is disposed near the inlet end.

[0042] like Figure 3 and Figure 4 As shown, the inner sleeve 220 may be in a sleeve shape, and the inner sleeve 220 is disposed in the plug-in channel 211 , and the inner sleeve 220 can reciprocate between a first position and a second position along the axial direction of the plug-in channel 211 relative to the mounting sleeve 210 .

[0043] In one embodiment, the outer wall of the inner sleeve 220 slidably fits with the inner wall of the insertion channel 211, so that the inner sleeve 220 can slide relative to the mounting sleeve 210 under the action of external force, and further the inner sleeve 220 can reciprocate between the first position and the second position relative to the mounting sleeve 210.

[0044] The first elastic reset member 230 may be a wave spring, an elastic sleeve or other element having an elastic reset function. Figure 3 and Figure 4 As shown, the first elastic reset member 230 is disposed in the insertion channel 211, and the front end of the first elastic reset member 230 abuts against the inner sleeve 220, and the rear end of the first elastic reset member 230 abuts against the inner wall of the insertion channel 211. In this way, when the drill bit 300 is inserted into the insertion channel 211 and applies a force to the inner sleeve 220, the inner sleeve 220 moves relative to the installation sleeve 210 under the action of the drill bit 300, and the inner sleeve 220 can apply a squeezing force to the first elastic reset member 230 to make the first elastic reset member 230 contract. At the same time, under the action of the reset force of the first elastic reset member 230, the inner sleeve 220 can also be pushed to move relative to the installation sleeve 210.

[0045] The two ends of the first elastic return member 230 are respectively in contact with the inner wall of the insertion channel 211 and the inner sleeve 220 , which can be achieved by a snap connection or a plug connection.

[0046] like Figure 3 and Figure 4As shown, in one embodiment, the inner wall of the insertion channel 211 is provided with a first abutting portion 213. Moreover, the first abutting portion 213 is spaced apart from the inner sleeve 220, so that the first elastic return member 230 can be disposed between the first abutting portion 213 and the inner sleeve 220. Moreover, the other end of the first elastic return member 230 abuts against the first abutting portion 213. In this way, when the drill bit 300 is inserted into the insertion channel 211 and applies a force to the inner sleeve 220, the inner sleeve 220 applies a force to the first elastic return member 230. Since the end of the first elastic return member 230 that is away from the inner sleeve 220 is abutted by the first resistance portion 213 and cannot move, the inner sleeve 220 squeezes the first elastic return member 230 when it moves relative to the mounting sleeve 210 toward the first resistance portion 213, so that the first elastic return member 230 is compressed and applies a return force to the inner sleeve 220 in the direction away from the first resistance portion 213, that is, the first elastic return member 230 applies a return force to the inner sleeve 220 along the pull-out direction.

[0047] The first abutting portion 213 may be in the form of an abutting flange or abutting rib, and only needs to be able to abut against the other end of the first elastic return member 230 during installation.

[0048] Furthermore, the thickness of the first resistance portion 213 matches the wall thickness of the inner sleeve 220, so that both ends of the first elastic return member 230 are subjected to uniform resistance force, ensuring the stability and uniformity of the first elastic return member 230 during compression or extension, and avoiding twisting or deviation of the first elastic return member 230 during compression or extension.

[0049] It should be noted that the thickness of the first resisting portion 213 refers to the extended wall thickness of the first resisting portion 213 along the radial direction of the inserting channel 211 .

[0050] The locking member 240 is at least partially disposed in the locking through hole 212 , and the locking member 240 can reciprocate along the axial direction of the locking through hole 212 relative to the mounting sleeve 210 , so that it can partially extend into the insertion channel 211 or retract into the locking through hole 212 .

[0051] The locking member 240 may be in the form of a locking ball or a locking pin with spherical cross-sections at both ends.

[0052] like Figure 3 and Figure 4 As shown, the locking sleeve 250 may be a cylindrical or annular structure, and the locking sleeve 250 is disposed on the outer peripheral side of the mounting sleeve 210 , and the locking sleeve 250 can reciprocate relative to the mounting sleeve 210 along the axial direction of the insertion channel 211 .

[0053] In one embodiment, the locking member 240 moves axially along the locking through hole 212 toward the insertion channel 211 under the action of gravity and / or the resistance force of the locking sleeve 250 and partially extends into the insertion channel 211; the locking member 240 moves axially along the locking through hole 212 toward the outside of the outer wall of the installation sleeve 210 under the resistance of the inner sleeve 220 and retreats into the locking through hole 212.

[0054] like Figure 4 As shown, when the inner sleeve 220 moves from the first position to the second position relative to the mounting sleeve 210, the first elastic return member 230 is in a compressed state, and the first elastic return member 230 applies a return force along the withdrawal direction to the inner sleeve 220, so that the inner sleeve 220 has a movement tendency along the withdrawal direction. At this time, the inner wall of the locking sleeve 250 abuts against the locking member 240 along the radial direction of the insertion channel 211, so that the locking member 240 partially extends into the insertion channel 211 and locks with the drill bit 300 to lock the drill bit 300, thereby stably and reliably realizing the installation and fixation of the drill bit 300.

[0055] When the locking sleeve 250 releases the locking member 240, for example, when the locking sleeve 250 moves along the axial direction of the mounting sleeve 210 until it no longer radially conflicts with the locking member 240, the inner sleeve 220 moves from the second position to the first position under the action of the first elastic reset member 230. Figure 3 As shown, at this time, the outer wall of the inner sleeve 220 is in abutment with the locking member 240 , so that the locking member 240 is retracted into the locking through hole 212 to unlock the drill bit 300 , thereby allowing the drill bit 300 to be smoothly moved out of the insertion channel 211 .

[0056] The drill bit installation structure 200 of the above embodiment, when installing the drill bit 300, the drill bit 300 is inserted into the plug-in channel 211, and the inner sleeve 220 is moved from the first position to the second position relative to the installation sleeve 210 along the insertion direction under the action of the drill bit 300, and the locking sleeve 250 is moved relative to the installation sleeve 210 until the inner wall of the locking sleeve 250 contacts the locking member 240 along the radial direction of the plug-in channel 211. At this time, the inner sleeve 220 and the locking member 240 are staggered and separated, that is, the inner sleeve 220 and the locking member 240 are staggered and separated from each other along the axial direction of the plug-in channel 211, so that the resistance force applied by the inner sleeve 220 to the locking member 240 disappears, and the locking member 240 moves under the action of gravity and / or the resistance force of the locking sleeve 250 to partially extend into the plug-in channel 211 and stably and reliably locks with the drill bit 300, thereby simply and conveniently realizing the installation and fixation of the drill bit 300. Furthermore, the first elastic reset member 230 applies a reset force along the extraction direction to the inner sleeve 220, so that the inner sleeve 220 has a tendency to move along the extraction direction. When the drill bit 300 needs to be replaced, the locking sleeve 250 is moved relative to the mounting sleeve 210 to release the locking member 240. At this time, the radial resistance force of the locking sleeve 250 on the locking member 240 disappears, and the inner sleeve 220 and the drill bit 300 are pushed to move along the extraction direction under the action of the reset force of the first elastic reset member 230 until the inner sleeve 220 moves from the second position to the first position, so that the outer wall of the inner sleeve 220 is in friction with the locking member 240 and the locking member 240 is returned to the locking through hole 212 to unlock the drill bit 300, so that the drill bit 300 can be smoothly ejected from the plug-in channel 211 for replacement, which is convenient for disassembly and improves replacement efficiency.

[0057] The movement of the locking sleeve 250 relative to the mounting sleeve 210 can be achieved by sliding fit or by threaded connection, as long as the inner wall of the locking sleeve 250 can contact the locking member 240 or release the locking member 240 along the radial direction of the insertion channel 211.

[0058] like Figures 2 to 4As shown, in one embodiment, the drill bit mounting structure 200 further includes a second elastic reset member 260. The second elastic reset member 260 may be a wave spring, an elastic sleeve or other element having an elastic reset function. The second elastic reset member 260 is disposed on the outer peripheral side of the mounting sleeve 210, and the second elastic reset member 260 is disposed away from the drill tip 310 of the drill bit 300 relative to the locking through hole 212. In addition, one end of the second elastic reset member 260 abuts against the locking sleeve 250, and the other end of the second elastic reset member 260 abuts against the outer side wall of the mounting sleeve 210. Furthermore, under the action of the second elastic return member 260, the locking sleeve 250 can reciprocate between a third position and a fourth position relative to the mounting sleeve 210 along the axial direction of the plug-in channel 211, so that the inner wall of the locking sleeve 250 and the locking member 240 are radially abutted against each other along the plug-in channel 211 or the inner wall of the locking sleeve 250 and the locking member 240 are radially spaced apart along the plug-in channel 211.

[0059] like Figure 3 As shown, specifically, when the inner sleeve 220 moves from the second position to the first position relative to the mounting sleeve 210, the circumferential outer wall of the inner sleeve 220 contacts and cooperates with the locking member 240. Under the action of the inner sleeve 220 on the locking member 240, the locking member 240 is retracted into the locking through hole 212 until it protrudes out of the outer wall of the mounting sleeve 210 and contacts and cooperates with the locking sleeve 250 along the axial direction of the insertion channel 211. At this time, the inner wall of the locking sleeve 250 contacts and cooperates with the locking member 240. The stop members 240 are arranged at radial intervals along the plug-in channel 211 so that the locking sleeve 250 is in the third position, and the locking sleeve 250 applies a force along the axial direction of the plug-in channel 211 and toward the insertion direction to the second elastic reset member 260. Correspondingly, the second elastic reset member 260 applies a reset force along the axial direction of the plug-in channel 211 and toward the removal direction to the locking sleeve 250, so that the locking sleeve 250 has a movement tendency along the axial direction of the plug-in channel 211 and toward the removal direction.

[0060] like Figure 4As shown, specifically, when the drill bit 300 is inserted into the insertion channel 211, the inner sleeve 220 moves from the first position to the second position relative to the mounting sleeve 210 under the action of the drill bit 300, and the inner sleeve 220 and the locking member 240 are staggered and separated from each other along the axial direction of the insertion channel 211, so that the resistance force applied by the inner sleeve 220 to the locking member 240 disappears, and the locking member 240 moves toward the insertion channel 211 along the axial direction of the locking through hole 212 under the action of gravity until a part of it extends into the insertion channel 211 and locks with the drill bit 300. At this time, the locking member 240 is 0 and the locking sleeve 250 disappear, and the second elastic reset member 260 applies a reset force to the locking sleeve 250 along the axial direction of the insertion channel 211 and in the direction of extraction, so that the locking sleeve 250 moves from the third position to the fourth position relative to the mounting sleeve 210. The locking sleeve 250 is in the fourth position, so that the inner wall of the locking sleeve 250 and the locking member 240 are in radial conflict with each other along the insertion channel 211, thereby making the locking member 240 remain in a state of partially extending into the insertion channel 211 and stably and reliably locking with the drill bit 300. At this time, the first elastic reset member 230 applies a reset force to the inner sleeve 220 along the axial direction of the insertion channel 211 and in the direction of extraction, so that the inner sleeve 220 has a movement tendency along the axial direction of the insertion channel 211 and in the direction of extraction.

[0061] When the drill bit 300 needs to be replaced, it is only necessary to apply a force to the locking sleeve 250 so that the locking sleeve 250 moves from the fourth position to the third position relative to the mounting sleeve 210. At this time, the resistance force of the locking sleeve 250 on the locking member 240 disappears. Under the action of the restoring force of the first elastic restoring member 230, the locking cooperation between the locking member 240 and the drill bit 300 is released and the locking member 240 moves back into the locking through hole 212 again until it protrudes from the outer wall of the mounting sleeve 210, so that the first elastic restoring member 230 can push the inner sleeve 220 and the drill bit 300 to move in the extraction direction, and then the drill bit 300 can be smoothly ejected from the plug-in channel 211 for replacement, which is convenient for disassembly and improves replacement efficiency. In addition, the drill bit 300 can be replaced by applying a force to the locking sleeve 250 with one hand, which is more convenient and quick to use. At the same time, after the drill bit 300 is ejected, the inner sleeve 220 moves to the first position relative to the installation sleeve 210 again, and the locking sleeve 250 moves to the third position relative to the installation sleeve 210 again, waiting for the next installation of the drill bit 300.

[0062] The two ends of the second elastic return member 260 are respectively abutted against the locking sleeve 250 and the installation sleeve 210 , which can be achieved by means of a snap connection or a plug connection.

[0063] like Figure 3 and Figure 4As shown, in one embodiment, the outer side wall of the installation sleeve 210 is provided with a second abutting portion 214. Furthermore, the second abutting portion 214 is spaced apart from the locking through hole 212, and the other end of the second elastic reset member 260 abuts against the second abutting portion 214, so that the second elastic reset member 260 can be arranged between the second abutting portion 214 and the locking sleeve 250. In this way, when the locking member 240 protrudes from the outer side wall of the installation sleeve 210 and applies a resisting force to the locking sleeve 250, the locking sleeve 250 applies a force to the second elastic reset member 260. Since the other end of the second elastic reset member 260 is abutted by the second abutting portion 214 and cannot move, the locking sleeve 250 squeezes the second elastic reset member 260 when it moves relative to the installation sleeve 210 in the insertion direction, so that the second elastic reset member 260 is compressed and applies a reset force in the extraction direction to the locking sleeve 250.

[0064] The second abutting portion 214 may be in the form of an abutting flange or abutting rib, and only needs to be able to abut against the other end of the second elastic return member 260 during installation.

[0065] In another embodiment, the locking sleeve 250 is threadedly connected to the mounting sleeve 210 so that the locking sleeve 250 can reciprocate relative to the mounting sleeve 210 along the axial direction of the mounting sleeve 210. In this way, the locking sleeve 250 can be rotated to move relative to the mounting sleeve 210 along the axial direction of the mounting sleeve 210, so that the inner wall of the locking sleeve 250 and the locking member 240 are spaced apart in the radial direction of the insertion channel 211 or the inner wall of the locking sleeve 250 and the locking member 240 are in radial contact with each other along the insertion channel 211, thereby achieving unlocking or locking and fixing of the drill bit 300.

[0066] Specifically, the outer wall of the mounting sleeve 210 is provided with an external thread, and the inner wall of the locking sleeve 250 is provided with an internal thread, and the locking sleeve 250 can reciprocate along the axial direction of the mounting sleeve 210 relative to the mounting sleeve 210 through the threaded cooperation between the internal thread and the external thread.

[0067] The acting force between the inner sleeve 220 and the drill bit 300 can be achieved by means of interference fit.

[0068] like Figure 2As shown, in one embodiment, the drill bit 300 includes a first mounting portion 320 and a second mounting portion 330 that are adjacently arranged, and the first mounting portion 320 and the second mounting portion 330 can both be cylindrical. Moreover, the second mounting portion 330 is arranged away from the drill tip 310 relative to the first mounting portion 320. Moreover, the outer wall of the first mounting portion 320 is provided with a locking groove 321 that is locked with the locking member 240. At the same time, the first mounting portion 320 and the second mounting portion 330 can both be inserted into the insertion channel 211, the second mounting portion 330 is penetrated through the inner sleeve 220, and a boss 340 that is in contact with the inner sleeve 220 is provided between the first mounting portion 320 and the second mounting portion 330. In this way, when the second mounting portion 330 and the first mounting portion 320 are successively inserted into the plug-in channel 211 along the insertion direction, the second mounting portion 330 passes through the cavity of the inner sleeve 220 and the boss 340 and the end surface of the inner sleeve 220 conflict with each other, thereby pushing the inner sleeve 220 in the first position to move relative to the mounting sleeve 210 along the insertion direction and compressing the first elastic return member 230 until the inner sleeve 220 moves to the second position. At this time, the circumferential outer wall of the inner sleeve 220 no longer conflicts with the locking member 240, and the locking member 240 moves along the axial direction of the locking through hole 212 toward the plug-in channel 211 under the action of gravity until a part of the locking member 240 extends into the plug-in channel 211 and is inserted into the locking groove 321 to achieve locking cooperation, thereby locking the drill bit 300, so that the drill bit 300 and the drill bit mounting structure 200 are stably and reliably assembled and fixed.

[0069] like Figure 3 and Figure 4 As shown, in one embodiment, the outer wall of the locking sleeve 250 is provided with an operating portion 251. Thus, the locking sleeve 250 is operated to move relative to the mounting sleeve 210 through the operating portion 251, which reduces the difficulty of operation, improves the operation efficiency, and makes the replacement of the drill bit 300 more convenient and quick.

[0070] Among them, the operating part 251 can be a flange structure or a boss structure that is easy to hold and apply force. It only needs to be able to simply and conveniently operate and apply force to the locking sleeve 250 so that the locking sleeve 250 can reciprocate between the third position and the fourth position relative to the mounting sleeve 210 along the axial direction of the insertion channel 211.

[0071] like Figure 3 and Figure 4As shown, in one embodiment, the outer side wall of the locking sleeve 250 includes a first circumferential side wall 2511 and a second circumferential side wall 2512. The outer diameter of the first circumferential side wall 2511 is greater than the outer diameter of the second circumferential side wall 2512, and the first circumferential side wall 2511 is arranged away from the drill tip 310 of the drill bit 300 relative to the second circumferential side wall 2512. At the same time, the first circumferential side wall 2511 and the second circumferential side wall 2512 cooperate to form the operating portion 251. In this way, due to the difference in the outer diameters of the first circumferential side wall 2511 and the second circumferential side wall 2512, the outer side wall of the locking sleeve 250 presents a shoulder structure, which is convenient for one-handed gripping to apply force to the locking sleeve 250, making the replacement of the drill bit 300 more convenient and quick.

[0072] like Figure 3 and Figure 4 As shown, in one embodiment, the inner wall of the locking sleeve 250 is provided with a pressing portion 252 extending radially along the insertion channel 211, and the pressing portion 252 is slidably matched with the outer wall of the mounting sleeve 210. Figure 4 As shown, when the inner sleeve 220 moves from the first position to the second position, the pressing portion 252 covers the locking through hole 212 and contacts the locking member 240 along the radial direction of the insertion channel 211, so that the locking member 240 partially extends into the insertion channel 211 and is stably and reliably locked with the drill bit 300, thereby simply and conveniently achieving installation and fixation of the drill bit 300; Figure 3 As shown, when the inner sleeve 220 moves from the second position to the first position, the pressing portion 252 is located on one side of the locking through hole 212 along the axial direction of the plug-in channel 211, so that the locking member 240 protrudes from the outer wall of the mounting sleeve 210 to unlock the drill bit 300, thereby allowing the drill bit 300 to be conveniently and quickly removed from the plug-in channel 211 for replacement.

[0073] The pressing portion 252 may be in the form of a resisting flange or a resisting rib, and it only needs to be able to cover the locking through hole 212 and resist and cooperate with the locking member 240 .

[0074] like Figure 3 and Figure 4As shown, further, a limiting portion 270 is provided at one end of the mounting sleeve 210 close to the drill tip 310 of the drill bit 300. When the pressing portion 252 covers the locking through hole 212 and contacts and cooperates with the locking member 240, the side of the pressing portion 252 close to the drill tip 310 of the drill bit 300 contacts and cooperates with the limiting portion 270. In this way, the limiting portion 270 is used to constrain and limit the moving position of the pressing portion 252, so that the locking sleeve 250 can accurately move to cover the locking through hole 212 and contact and cooperate with the locking member 240, ensuring that the locking member 240 partially extends into the insertion channel 211 and realizes stable and reliable locking cooperation with the drill bit 300.

[0075] Among them, the limiting part 270 can be detachably connected to the installation sleeve 210, so that the limiting part 270 can be removed from the installation sleeve 210 first, and then the locking sleeve 250 and the installation sleeve 210 can be assembled and connected, and then the limiting part 270 can be installed and matched with the installation sleeve 210 to avoid interference or conflict in the assembly of parts.

[0076] The detachable manner can be achieved by snap connection, screw connection, etc.

[0077] In one embodiment, the limiting portion 270 may be in the form of a limiting snap ring, and the limiting snap ring and the mounting sleeve 210 may be detachably assembled in a snap-fit ​​manner, and an installation groove for installing the limiting snap ring may be provided on the mounting sleeve 210 .

[0078] In one embodiment, the limiting portion 270 may also be in the form of a threaded sleeve, and the threaded sleeve and the mounting sleeve 210 may be detachably assembled in a threaded connection or other manner, and the mounting sleeve 210 may be provided with an external thread for mounting the threaded sleeve.

[0079] like Figure 3 and Figure 4 As shown, in addition, one of the inner side wall of the insertion channel 211 and the inner sleeve 220 is provided with a guide groove 221 extending along the axial direction of the insertion channel 211, and the other is provided with a guide protrusion 215, and the guide protrusion 215 is guided and matched with the guide groove 221. Moreover, the guide protrusion 215 is guided and matched with the guide groove 221. In this way, when the inner sleeve 220 reciprocates between the first position and the second position relative to the mounting sleeve 210, the guiding cooperation between the guide protrusion 215 and the guide groove 221 makes the movement of the inner sleeve 220 more accurate and stable, and can also prevent the inner sleeve 220 from rotating relative to the mounting sleeve 210 to cause abnormal noise or wear.

[0080] Specifically in the embodiment of the present application, the inner sleeve 220 is provided with a guide groove 221 , and the inner side wall of the insertion channel 211 is provided with a guide protrusion 215 .

[0081] Furthermore, the length of the guide groove 221 (eg Figure 4In this way, the moving position of the guide protrusion 215 is constrained by the two ends of the guide groove 221, so that the inner sleeve 220 can be accurately moved to the first position and the second position, and the inner sleeve 220 can be prevented from being moved out of the insertion channel 211 when the drill bit 300 is replaced, and when the drill bit 300 is inserted into the insertion channel 211, it is ensured that the locking member 240 can accurately achieve locking cooperation with the drill bit 300, for example, the locking member 240 is accurately inserted into the locking groove 321.

[0082] It should be noted that the length of the guide groove 221 refers to the distance between two ends of the guide groove 221 along the axial direction of the insertion channel 211 .

[0083] It should be noted that "some body" or "some part" can be a part of the corresponding "component", that is, "some body" or "some part" can be integrally formed with the "other parts of the component"; it can also be an independent component that can be separated from the "other parts of the component", that is, "some body" or "some part" can be manufactured independently and then combined with the "other parts of the component" into a whole. The expression of the above-mentioned "some body" or "some part" in this application is only one of the embodiments, for the convenience of reading, and not to limit the scope of protection of this application. As long as it contains the above-mentioned features and has the same function, it should be understood as an equivalent technical solution of this application.

[0084] It should be noted that the components included in the "unit", "assembly", "mechanism" and "device" of this application can also be flexibly combined, that is, modular production can be carried out according to actual needs to facilitate modular assembly. The division of the above components in this application is only one of the embodiments, for the convenience of reading, and not to limit the scope of protection of this application. As long as the above components are included and have the same functions, it should be understood that it is an equivalent technical solution of this application.

[0085] In the description of the present invention, it should be understood that 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" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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. The term "and / or" used in the present invention includes any and all combinations of one or more related listed items.

[0086] 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 at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0087] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" 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, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0088] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0089] It should be noted that when an element is referred to as being "fixed on", "set on", "fixed on" or "installed on" another element, it can be directly on the other element or there can be a central element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there can be a central element at the same time. Further, when an element is considered to be "fixed transmission connected" to another element, the two can be fixed in a detachable connection manner or in a non-detachable connection, as long as power transmission can be achieved, such as socketing, snap-on, one-piece molding fixation, welding, etc., which can be achieved in the prior art and will not be repeated here. When an element is perpendicular or approximately perpendicular to another element, it means that the ideal state of the two is vertical, but due to the influence of manufacturing and assembly, there may be a certain vertical error. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0090] It should also be understood that when explaining the connection relationship or positional relationship of elements, although not explicitly described, the connection relationship and positional relationship are interpreted as including an error range, which should be within the acceptable deviation range of a specific value determined by those skilled in the art. For example, "approximately", "approximately" or "substantially" may mean within one or more standard deviations, which are not limited here.

[0091] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0092] The above embodiments only express several implementation methods of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A drill bit mounting structure, characterized in that: include: A mounting sleeve, wherein the mounting sleeve is provided with an insertion passage for inserting a drill bit, and a locking through hole communicated with the insertion passage, and the locking through hole radially penetrates a side wall of the mounting sleeve; An inner sleeve, the inner sleeve is disposed in the insertion passage, and the inner sleeve can reciprocate between a first position and a second position along the axial direction of the insertion passage relative to the mounting sleeve; a first elastic return member, wherein the first elastic return member is disposed in the insertion channel, a front end of the first elastic return member abuts against the inner sleeve, and a rear end of the first elastic return member abuts against an inner wall of the insertion channel; A locking member, wherein the locking member is at least partially disposed in the locking through hole and is capable of reciprocating along the axial direction of the locking through hole so as to partially extend into the insertion channel or retract into the locking through hole; A locking sleeve, which is disposed outside the mounting sleeve and can reciprocate along the axial direction of the mounting sleeve; Wherein, when the inner sleeve moves from the first position to the second position, the first elastic return member is in a compressed state, and the inner wall of the locking sleeve abuts against the locking member along the radial direction of the insertion channel, so that the locking member partially extends into the insertion channel to lock the drill bit; When the locking sleeve releases the locking member, the first elastic return member returns to the released state, so that the inner sleeve moves from the second position to the first position, and the outer wall of the inner sleeve contacts and cooperates with the locking member, so that the locking member retreats into the locking through hole to unlock the drill bit.

2. The drill bit mounting structure according to claim 1, characterized in that: The drill bit mounting structure also includes a second elastic return member, which is arranged on the outer peripheral side of the mounting sleeve, and the second elastic return member is arranged relative to the locking through hole away from the drill tip of the drill bit. One end of the second elastic return member abuts against the locking sleeve, and the other end of the second elastic return member abuts against the outer side wall of the mounting sleeve. Under the action of the second elastic return member, the locking sleeve can reciprocate between a third position and a fourth position relative to the mounting sleeve along the axial direction of the insertion channel, so that the inner wall of the locking sleeve and the locking member are radially spaced apart from each other along the insertion channel or the inner wall of the locking sleeve and the locking member are radially in conflict with each other along the insertion channel.

3. The drill bit mounting structure according to claim 1, characterized in that: The locking sleeve is threadedly connected to the mounting sleeve so that the locking sleeve can reciprocate relative to the mounting sleeve along the axial direction of the mounting sleeve.

4. The drill bit mounting structure according to claim 1, characterized in that: An operating portion is provided on the outer side wall of the lock sleeve.

5. The drill bit mounting structure according to claim 4, characterized in that: The outer side wall of the locking sleeve includes a first circumferential side wall and a second circumferential side wall, the outer diameter of the first circumferential side wall is greater than the outer diameter of the second circumferential side wall, and the first circumferential side wall is arranged away from the drill tip of the drill bit relative to the second circumferential side wall, and the first circumferential side wall and the second circumferential side wall cooperate to form the operating part.

6. The drill bit mounting structure according to any one of claims 1 to 5, characterized in that: The inner wall of the locking sleeve is provided with a pressing portion extending radially along the insertion channel, and the pressing portion is slidably matched with the outer wall of the mounting sleeve; Wherein, when the inner sleeve moves from the first position to the second position, the pressing portion covers the locking through hole and abuts against the locking piece along the radial direction of the insertion channel; when the inner sleeve moves from the second position to the first position, the pressing portion is located on one side of the locking through hole along the axial direction of the insertion channel so that the locking piece protrudes from the outer wall of the mounting sleeve to unlock the drill bit.

7. The drill bit mounting structure according to claim 6, characterized in that: A limiting portion is provided at one end of the mounting sleeve close to the drill tip of the drill bit. When the pressing portion covers the locking through hole and contacts and cooperates with the locking member, the side of the pressing portion close to the drill tip of the drill bit cooperates with the limiting portion.

8. The drill bit mounting structure according to claim 7, characterized in that: The limiting portion is detachably connected to the mounting sleeve.

9. The drill bit mounting structure according to claim 8, characterized in that: The limiting portion includes a limiting clamping ring or a threaded sleeve.

10. A bone drilling device, characterized in that: include: Power handle; The drill bit mounting structure according to any one of claims 1 to 9, wherein the drill bit mounting structure is connected to the power handle; and A drill bit, the drill bit comprising a first mounting portion and a second mounting portion arranged adjacent to each other, the second mounting portion being arranged away from the drill tip relative to the first mounting portion, and the outer wall of the first mounting portion being provided with a locking groove which is locked with the locking member; wherein both the first mounting portion and the second mounting portion can be inserted into the insertion channel, the second mounting portion is passed through the inner sleeve, and a boss which is in contact with the inner sleeve is provided between the first mounting portion and the second mounting portion.

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