Depth-adjustable limited-depth oral bone drill cutting mechanism

Abstract

The application provides a depth-adjustable and position-limited oral bone drilling mechanism, and belongs to the technical field of oral implant surgery instruments. The depth-adjustable and position-limited oral bone drilling mechanism comprises a positioning support, a plurality of upper and lower through dental row positioning grooves are formed in the positioning support, an oral implant bone taking mechanism is arranged on the positioning support, the oral implant bone taking mechanism comprises a mounting plate and a first limiting rod, and the mounting plate is fixed above a bone taking mounting position corresponding to one of the dental row positioning grooves. The oral implant bone taking mechanism is arranged, so that the bone taking position is detected before formal oral implant bone drilling. Since the bone thickness of the bone taking position needs to meet the sum of a preset tooth taking depth, a safe residual bone wall depth and an error compensation amount, the device can avoid the problem that bone taking is prone to causing safety accidents when the bone taking position deviates due to inaccurate positioning.

Description

Technical Field

[0001] This invention relates to the field of oral implant surgical instruments, and more specifically, to an adjustable depth-limiting oral bone harvesting drill mechanism. Background Technology

[0002] In dental implant restoration, when there is insufficient alveolar bone volume in the edentulous area, or when the width or height of the alveolar ridge cannot meet the requirements for implant placement, bone augmentation is usually required before implantation to improve bone support conditions in the implant area. In clinical practice, autologous bone materials can be used to fill bone defects, widen the alveolar ridge, or supplement bone volume around the implant socket. Autologous bone materials come from the bone donor area of ​​the jawbone in the oral cavity. In order to obtain bone material that meets the needs of bone grafting in the narrow space of the oral cavity, existing instruments usually use bone harvesting drills, circular bone harvesting drills, bone chisels, or implant guide instruments in conjunction with dental handpieces to complete the bone harvesting operation. The location and depth of bone harvesting are controlled by preoperative imaging, doctor's experience, depth scales, or limiting structures.

[0003] Existing oral bone harvesting drilling instruments can only limit the depth of the drill bit during the drilling stage. It is difficult to make a mechanical access judgment on whether the local bone thickness at the bone harvesting site meets the bone harvesting conditions before the actual bone harvesting. If the bone harvesting site cannot simultaneously meet the preset bone harvesting depth, safe remaining bone wall thickness and error compensation requirements due to insufficient positioning deviation, bone harvesting drilling will still be performed, which can easily lead to excessive drilling, insufficient remaining bone wall thickness and increased risk of penetration. Summary of the Invention

[0004] To overcome the above deficiencies, the present invention provides an adjustable depth-limiting oral bone harvesting drill mechanism that overcomes or at least partially solves the above technical problems.

[0005] This invention is implemented as follows:

[0006] This invention provides an adjustable depth-limiting oral bone harvesting drilling mechanism, including a positioning bracket with a plurality of vertically penetrating dentition positioning slots. The positioning bracket is equipped with an oral implant bone harvesting mechanism, which includes...

[0007] Mounting plate, the mounting plate is fixed above one of the tooth row positioning grooves, the bottom of the mounting plate is fixed with a guide sleeve, the inside of the guide sleeve is provided with a transverse sliding groove, and the guide sleeve is provided with a central guide groove that runs vertically through the top and bottom.

[0008] A first limiting rod is fixed inside a transverse sliding groove. A sliding core is slidably fitted inside the transverse sliding groove via the first limiting rod. A return spring is provided between the sliding core and the guide sleeve. A pre-exploration channel and a drilling channel are provided on the sliding core. The drilling channel is vertically continuous. A pre-exploration sleeve is slidably fitted inside the pre-exploration channel. A pre-probe is provided at the bottom of the pre-exploration sleeve. The bottom of the pre-probe is flush with the bottom of the pre-exploration channel. A first spring is provided between the pre-exploration sleeve and the pre-probe.

[0009] In a preferred embodiment, a plurality of second limiting rods are fixedly disposed inside the sliding core, and a plurality of ear plates are integrally formed on the pre-probing sleeve. The ear plates are slidably sleeved on the surface of the second limiting rods, and a driving block is fixedly disposed on one of the ear plates. The top and bottom of the driving block are both inclined surfaces.

[0010] In a preferred embodiment, the sliding core has a first receiving cavity inside, and a first locking block is slidably disposed inside the first receiving cavity. The first locking block is located above the driving block, and a third spring is disposed inside the first locking block and the first receiving cavity.

[0011] In a preferred embodiment, a first locking pin is fixed on the side of the first locking block away from the pre-exploration sleeve, and a first positioning hole is provided between the sliding core and the guide sleeve.

[0012] In a preferred embodiment, the sliding core has a second receiving cavity inside, a lifting seat is slidably disposed inside the second receiving cavity, a second locking block is slidably disposed on the lifting seat, the second locking block is located below the driving block, and a fourth spring is disposed between the second locking block and the lifting seat.

[0013] In a preferred embodiment, a second locking pin is fixed on the side of the second locking block away from the pre-exploration sleeve, and a plurality of second positioning holes are provided between the sliding core and the guide sleeve, and the plurality of second positioning holes are arranged in an array along the vertical direction of the guide sleeve.

[0014] In a preferred embodiment, a threaded sleeve is rotatably mounted on the lifting seat via a bearing, a threaded rod is fixedly mounted on the second locking block, the threaded rod is threadedly fitted inside the threaded sleeve, a ratchet is coaxially fixed on the surface of the threaded sleeve, and a pawl is rotatably mounted on the lifting seat.

[0015] In a preferred embodiment, the sliding core is provided with a stroke locking mechanism, which includes a connecting rod fixed to the top of the pre-probe, and a drive head is fixed to the top of the connecting rod.

[0016] In a preferred embodiment, the sliding core has a third receiving cavity inside, and a third locking block is slidably disposed inside the third receiving cavity. The third locking block is located above the driving head, and a fifth spring is disposed between the third locking block and the inner wall of the third receiving cavity.

[0017] In a preferred embodiment, a third locking pin is fixed on the side of the third locking block away from the fifth spring, and a plurality of third positioning holes are formed on the inner wall of the sliding core in the vertical direction.

[0018] The present invention provides an adjustable depth-limiting oral bone harvesting drill mechanism, the beneficial effects of which include:

[0019] 1. By setting up a bone harvesting mechanism for dental implants, the bone harvesting location can be detected before the actual dental implant drilling. Since the bone thickness at the location to be harvested needs to meet the sum of the preset tooth harvesting depth, the safe remaining bone wall depth, and the error compensation amount, this device can avoid the problem of safety accidents caused by inaccurate positioning when the bone harvesting location deviates.

[0020] 2. By setting a travel locking mechanism, when the pre-probe sleeve moves downward, the bottom of the pre-probe abuts against the alveolar bone surface on the entrance side of the bone harvesting site. The pre-probe moves upward relative to the pre-probe sleeve, causing the third locking pin to be misaligned with the third positioning hole in the vertical direction. The pre-probe sleeve continues to move downward, forcing the pre-probe to move downward. During the downward movement, when the bone thickness at the bone harvesting site is not below the preset condition, the drive head moves downward relative to the third locking block, and the third locking pin is released and inserted into the corresponding third positioning hole, thereby preventing the pre-probe sleeve from continuing to move downward and causing harm to the patient. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall three-dimensional structure provided by an embodiment of the present invention;

[0023] Figure 2 A schematic diagram of the guide sleeve is provided for embodiments of the present invention;

[0024] Figure 3 A partial cross-sectional view of the guide sleeve is provided for embodiments of the present invention;

[0025] Figure 4 A partial cross-sectional view of the guide sleeve and the sliding core is provided for embodiments of the present invention;

[0026] Figure 5 A partial cross-sectional view of the sliding core is provided for embodiments of the present invention;

[0027] Figure 6 A schematic diagram of the drive head and the third locking block is provided for embodiments of the present invention;

[0028] Figure 7 A schematic diagram of the structure of the first positioning hole and the second positioning hole is provided for embodiments of the present invention;

[0029] Figure 8 A partial cross-sectional view of the first receiving cavity and the second receiving cavity is provided for embodiments of the present invention;

[0030] Figure 9 A schematic diagram of the structure of the first locking block is provided for an embodiment of the present invention;

[0031] Figure 10 A partial cross-sectional view of the lifting seat is provided for embodiments of the present invention.

[0032] In the diagram: 1. Positioning bracket; 2. Tooth row positioning groove; 301. Mounting plate; 302. Guide sleeve; 303. Transverse slide groove; 304. Central guide groove; 305. First limiting rod; 306. Sliding core; 307. Return spring; 308. Pre-probing channel; 309. Drilling channel; 310. Pre-probing sleeve; 311. Pre-probing probe; 312. First spring; 313. Second limiting rod; 314. Ear plate; 315. Drive block; 316. First receiving cavity; 317. First locking block; 318. Third spring 319. First locking pin; 320. First positioning hole; 321. Second receiving cavity; 322. Lifting seat; 323. Second locking block; 324. Fourth spring; 325. Second locking pin; 326. Second positioning hole; 327. Threaded sleeve; 328. Threaded rod; 329. Ratchet; 330. Pawl; 401. Connecting rod; 402. Drive head; 403. Third receiving cavity; 404. Third locking block; 405. Fifth spring; 406. Third locking pin; 407. Third positioning hole. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Reference Figures 1-10This invention provides a technical solution: an adjustable depth-limiting oral bone harvesting drilling mechanism, including a positioning bracket 1. The positioning bracket 1 has several vertically penetrating dental arch positioning slots 2. The number and shape of the dental arch positioning slots 2 correspond to the crown shape of the mandibular dentition, facilitating the stable mounting of the positioning bracket 1 on the patient's mandibular dentition and providing an installation reference for the drilling device during oral implant bone harvesting. The positioning bracket 1 is equipped with an oral implant bone harvesting mechanism, which includes a mounting plate 301 and a first limiting rod 305. The mounting plate 301 is fixed above the bone harvesting installation position corresponding to one of the dental arch positioning slots 2 by bolts. A guide sleeve 302 is fixed to the bottom of the mounting plate 301, and the bottom of the guide sleeve 302 has a bone surface abutment end. The guide sleeve 302 is designed to abut against the alveolar bone surface at the bone harvesting location. A transverse groove 303 is provided inside the guide sleeve 302, and a central guide groove 304 extends vertically through the guide sleeve 302. A first limiting rod 305 is fixed inside the transverse groove 303. A sliding core 306 is slidably fitted inside the transverse groove 303 via the first limiting rod 305. A return spring 307 is provided between the sliding core 306 and the guide sleeve 302. Initially, the return spring 307 is in a stretched state. A pre-exploration channel 308 and a drilling channel 309 are provided on the sliding core 306. Initially, the pre-exploration channel 308 and the central guide groove 304 are coaxially aligned, and the drilling channel 309 extends vertically through the guide sleeve 309. A pre-exploration sleeve 31 is slidably fitted inside the pre-exploration channel 308. 0. A pre-probe 311 is provided at the bottom of the pre-probe sleeve 310. The bottom height of the pre-probe 311 is flush with the bottom height of the pre-probe channel 308. A first spring 312 is provided between the pre-probe sleeve 310 and the pre-probe 311. A second spring (not shown in the figure) is provided between the pre-probe sleeve 310 and the slide core 306. A first hydraulic rod is provided inside the slide core 306. A pressing block is provided at the output end of the first hydraulic rod. After the first hydraulic rod is activated, the pressing block applies pressing force from above the pre-probe sleeve 310, causing the pre-probe sleeve 310 to move the pre-probe 311 downward. By setting up an oral implant bone harvesting mechanism, the bone harvesting position is detected before the actual oral implant bone harvesting drilling. Since the bone thickness at the bone harvesting position needs to meet the preset tooth harvesting requirements. The sum of depth, safe remaining bone wall depth, and error compensation amount allows this device to avoid safety accidents caused by inaccurate positioning leading to deviations in the bone harvesting position. Positioning bracket 1 is placed above the patient's mandibular dentition. Mounting plate 301 is bolted to the corresponding bone harvesting mounting position. The bone surface abutment end of the guide sleeve 302 contacts the alveolar bone surface on the inlet side of the bone harvesting position. After locking with a locking device (such as a flexible clamp, which is existing technology and will not be described further), the first hydraulic rod is driven. The first hydraulic rod drives the pressing block to press against the top of the pre-probe sleeve 310, causing the pre-probe sleeve 310 to move the pre-probe 311 downwards. The first spring 312 is compressed, and the pre-probe 311 and the pre-probe sleeve 310 are in close contact.The bone thickness at the bone harvesting location is checked. When the bone thickness is acceptable, the pre-probe 311 and pre-probe sleeve 310 remain in close contact. After reaching the preset position, the pre-probe sleeve 310 and pre-probe 311 are reset, and the return spring 307 is released. The sliding core 306 moves, making the drilling channel 309 coaxial with the central guide groove 304. At this time, the user uses the drilling device to harvest bone through the drilling channel 309. When the bone thickness is unacceptable, the first spring 312 is released, and the pre-probe 311 and pre-probe sleeve 310 separate. At this time, the pre-probe sleeve 310 is locked and cannot move further.

[0035] Reference Figures 1-10 The sliding core 306 has several second limiting rods 313 fixed inside. The pre-probing sleeve 310 has several ear plates 314 integrally formed on it. The ear plates 314 are slidably fitted onto the surfaces of the second limiting rods 313. One ear plate 314 has a driving block 315 fixed on it. The top and bottom of the driving block 315 are inclined surfaces. The second limiting rods 313 are arranged along the downward direction of the pre-probing sleeve 310, restricting the pre-probing sleeve 310 to only move up and down relative to the sliding core 306. The sliding core 306 has a first receiving cavity 316 inside. A first locking block 317 is slidably arranged inside the first receiving cavity 316, located above the driving block 315. A third spring 318 and a telescopic rod are arranged inside the first locking block 317 and the first receiving cavity 316. The first locking block 317 is slidably arranged away from the guide sleeve 302. A first lock is fixed on the side of the first locking block 317 away from the pre-probing sleeve 310. A first positioning hole 320 is provided between the stop pin 319, the sliding core 306, and the guide sleeve 302. In the initial state, the third spring 318 is in a compressed state, and the first locking stop pin 319 is disengaged from the first positioning hole 320. By setting the first locking block 317 and the driving block 315, the sliding core 306 is locked when the pre-probe sleeve 310 moves down, preventing the sliding core 306 from shifting during the operation of the pre-probe sleeve 310 and the pre-probe probe 31. 1. Lateral displacement is performed. When the pre-probing sleeve 310 moves downward, the driving block 315 moves downward simultaneously, the third spring 318 is released, and the first locking block 317 drives the first locking pin 319 to extend into the interior of the first positioning hole 320. When the bone thickness is qualified, the pre-probing sleeve 310 returns to its original position, and the top of the driving block 315 presses against the first locking block 317, causing the first locking pin 319 to disengage from the first positioning hole 320, and the sliding core 306 unlocks.

[0036] Reference Figures 1-10The sliding core 306 has a second receiving cavity 321 inside, and a lifting seat 322 is slidably disposed inside the second receiving cavity 321. A second locking block 323 is slidably disposed on the lifting seat 322. The second locking block 323 is located below the driving block 315. A fourth spring 324 is disposed between the second locking block 323 and the lifting seat 322. A second hydraulic rod is disposed inside the sliding core 306. The output end of the second hydraulic rod is fixedly connected to the lifting seat 322 to adjust the height of the lifting seat 322. The side of the second locking block 323 away from the pre-exploration sleeve 310 is fixedly provided with a... A plurality of second positioning holes 326 are provided between the second locking pin 325, the sliding core 306, and the guide sleeve 302. These second positioning holes 326 are arranged in an array along the vertical direction of the guide sleeve 302. Each second positioning hole 326 corresponds to a minimum acceptable bone thickness setting. The minimum acceptable bone thickness is the sum of the preset bone extraction depth, the safe remaining bone wall thickness, and the error compensation amount. A sliding groove is provided on the lifting seat 322. An abutment block is fixed to the bottom of the second locking block 323, extending through the interior of the sliding groove. A third hydraulic rod is provided on the lifting seat 322. The output end of the rod is equipped with a pressure block, which abuts against the abutment block. This abuts against the abutment block to actively force the second locking pin 325 to disengage from the second positioning hole 326 when adjusting the height of the lifting seat 322. By setting the second locking pin 325 and the second positioning hole 326, the user first sets the height of the lifting seat 322 using the second hydraulic rod, aligning the second locking pin 325 with the second positioning hole 326 corresponding to the minimum acceptable bone thickness. In the initial state, the stroke difference between the bottom of the probe sleeve 310 and the bottom of the guide sleeve 302 is the error compensation amount. In addition, the preset bone extraction depth and the safe remaining bone wall thickness are adjusted based on specific criteria. After the lifting seat 322 is adjusted, the second locking pin 325 extends into the corresponding second positioning hole 326, so that the sliding core 306 is locked in the pre-probing position. The pre-probing sleeve 310 moves downward. When the bone thickness is qualified, the bottom of the driving block 315 contacts the second locking block 323. By squeezing the second locking block 323, the second locking pin 325 is disengaged from the corresponding second positioning hole 326, thereby unlocking the second locking pin 325 from locking the sliding core 306.

[0037] Reference Figures 1-10A threaded sleeve 327 is rotatably mounted on the lifting seat 322 via a bearing. A threaded rod 328 is fixedly mounted on the second locking block 323, and the threaded rod 328 is threadedly fitted inside the threaded sleeve 327. A ratchet 329 is coaxially fixed to the surface of the threaded sleeve 327. A pawl 330 is rotatably mounted on the lifting seat 322, and a torsion spring is provided between the pawl 330 and the lifting seat 322. A first electromagnet is mounted on the pawl 330, and a second electromagnet is mounted on the lifting seat 322. When the position of the second locking block 323 needs to be reset, the second electromagnet is energized, and the first electromagnet is attracted by magnetic force, pulling the pawl 330 downward, actively engaging with the ratchet 329. 29 disengages by setting a ratchet 329 and a pawl 330. When the second locking block 323 moves, the threaded connection between the threaded rod 328 and the threaded sleeve 327 causes the threaded sleeve 327 to rotate, thereby driving the pawl 330 to rotate. Under the action of the torsion spring, the pawl 330 engages with the tooth groove of the ratchet 329, limiting the reverse rotation of the ratchet 329 until the second locking block 323 reaches the preset position. Then, the pawl 330 locks the ratchet 329, preventing the second locking pin 325 from locking again before the sliding core 306 moves. The horizontal section of the second locking block 323 can prevent the pre-probing sleeve 310 from continuing to move downward after reaching the preset position.

[0038] Reference Figures 1-10The sliding core 306 is internally equipped with a stroke locking mechanism, which includes a connecting rod 401. The connecting rod 401 is fixed to the top of the pre-probe 311, and a driving head 402 is fixed to the top of the connecting rod 401. The connecting rod 401 passes through the pre-probe sleeve 310 along the axial direction and can move axially relative to the pre-probe sleeve 310 with the pre-probe 311. The sliding core 306 has a third receiving cavity 403 inside, and a third locking block is slidably disposed inside the third receiving cavity 403. 404. The third locking block 404 is located above the drive head 402. A fifth spring 405 is provided between the third locking block 404 and the inner wall of the third receiving cavity 403. The third locking block 404 is slidably disposed in the direction away from the pre-probing sleeve 310. A third locking pin 406 is fixedly disposed on the side of the third locking block 404 away from the fifth spring 405. Several third positioning holes 407 are opened vertically on the inner wall of the sliding core 306. In the initial state, the uppermost third positioning hole 407 and the third locking pin 406 are... A no-load travel section is reserved between points 6. By setting a travel locking mechanism, when the pre-probe sleeve 310 moves downwards, the bottom of the pre-probe 311 abuts against the alveolar bone surface on the entrance side of the bone harvesting point, causing the first spring 312 to be compressed. The top of the pre-probe 311 contacts the bottom of the pre-probe sleeve 310. During this process, the pre-probe 311 moves upwards relative to the pre-probe sleeve 310. The connecting rod 401 drives the drive head 402 to move upwards, and the drive head 402 presses against the third locking block 404, causing the third locking pin to... The shaft 406 and the third positioning hole 407 are misaligned in the vertical direction. The pre-probe sleeve 310 continues to move downward, forcing the pre-probe 311 to move downward. During the downward movement, when the bone thickness at the bone harvesting site is not below the preset condition, the first spring 312 is released, and the pre-probe 311 and the pre-probe sleeve 310 separate again. At this time, the drive head 402 moves downward relative to the third locking block 404, and the third locking pin shaft 406 is released and inserted into the corresponding third positioning hole 407, thereby preventing the pre-probe sleeve 310 from continuing to move downward and causing harm to the patient.

[0039] Specifically, the working process or principle of this adjustable depth-limiting oral bone harvesting drilling mechanism is as follows: During use, the user places the positioning bracket 1 above the patient's mandibular dentition, so that the dentition positioning groove 2 fits snugly with the patient's mandibular crown. The positioning bracket 1 is then fixed to the patient's mandibular dentition using a locking structure. The mounting plate 301 is bolted to the corresponding bone harvesting position, aligning the central guide groove 304 on the guide sleeve 302 with the bone to be harvested. The bone surface abutment end at the bottom of the guide sleeve 302 contacts the alveolar bone surface on the entrance side of the bone harvesting position. This bone surface abutment end serves as a common reference surface for the downward stroke of the pre-exploratory sleeve 310 and the formal drilling depth. The user sets the height of the lifting seat 322 using the second hydraulic rod, allowing the second... The locking pin 325 is aligned with the second positioning hole 326 corresponding to the minimum acceptable bone thickness. When the second locking pin 325 extends into the corresponding second positioning hole 326, the slide core 306 is locked in the pre-probing position, driving the first hydraulic rod. The first hydraulic rod drives the pressing block to press the top of the pre-probing sleeve 310, causing the pre-probing sleeve 310 to move the pre-probing probe 311 downward. When the pre-probing sleeve 310 moves downward, the driving block 315 moves downward simultaneously, the third spring 318 is released, and the first locking block 317 drives the first locking pin 319 to extend into the interior of the first positioning hole 320, so that the slide core 306 is temporarily locked during the pre-probing process. When the bone thickness is acceptable, the pre-probing probe 311 is continuously subjected to bone tissue resistance within the preset stroke, and the first spring 312... Maintaining the compressed state, the pre-probe 311 and the pre-probe sleeve 310 remain in close contact. When the pre-probe sleeve 310 continues to move downward to the position corresponding to the minimum qualified bone thickness, the bottom of the drive block 315 contacts the second locking block 323. By squeezing the second locking block 323, the second locking pin 325 disengages from the corresponding second positioning hole 326, thereby unlocking the lock of the sliding core 306 by the second locking pin 325. Simultaneously, through the threaded connection between the threaded rod 328 and the threaded sleeve 327, the threaded sleeve 327 rotates, thereby driving the ratchet 329 to rotate synchronously. The pawl 330, under the action of the torsion spring, engages with the tooth groove of the ratchet 329, restricting the reverse rotation of the ratchet 329. The horizontal section of the second locking block 323 engages with the drive block 315. 5. An obstruction mechanism prevents the pre-probe sleeve 310 from continuing to descend after reaching the preset position. The pre-probe sleeve 310 and pre-probe probe 311 reset under the action of the second spring. When the pre-probe sleeve 310 returns to its original position, the top of the drive block 315 presses against the first locking block 317, causing the first locking pin 319 to disengage from the first positioning hole 320. At this point, neither the first locking pin 319 nor the second locking pin 325 locks the sliding core 306. The reset spring 307 is released, and the sliding core 306 moves laterally along the first limiting rod 305, making the drilling channel 309 coaxial with the central guide groove 304. The user then uses the drilling device to perform oral implant bone harvesting through the drilling channel 309 and the central guide groove 304. If the bone thickness is unsuitable...Before reaching the position corresponding to the minimum acceptable bone thickness, the pre-probe 311 enters a low-resistance state, the first spring 312 is released, and the pre-probe 311 and the pre-probe sleeve 310 separate again. At this time, the connecting rod 401 drives the drive head 402 to move downward relative to the third locking block 404, the third locking pin 406 is released and inserted into the corresponding third positioning hole 407, thereby preventing the pre-probe sleeve 310 from continuing to move downward and causing injury to the patient. At this time, the second locking pin 325 cannot disengage normally from the second positioning hole 326, the sliding core 306 cannot switch to the drilling position under the action of the return spring 307, and the drilling channel 309 cannot be coaxial with the central guide groove 304, thus preventing the drilling device from entering the position of the bone to be harvested where the bone thickness is insufficient.

Claims

1. An adjustable depth-limiting oral bone-harvesting drilling mechanism, comprising a positioning tray (1), wherein the positioning tray (1) is provided with a plurality of vertically penetrating dental positioning grooves (2), characterized in that, The positioning bracket (1) is equipped with an oral implant bone harvesting mechanism, which includes, Mounting plate (301), which is fixed above one of the tooth row positioning grooves (2), and a guide sleeve (302) is fixed at the bottom of the mounting plate (301). A transverse sliding groove (303) is provided inside the guide sleeve (302), and a central guide groove (304) is provided on the guide sleeve (302) that runs vertically through it. The first limiting rod (305) is fixed inside the transverse slide groove (303). The transverse slide groove (303) is slidably fitted with a sliding core (306) through the first limiting rod (305). A return spring (307) is provided between the sliding core (306) and the guide sleeve (302). The sliding core (306) is provided with a pre-exploration channel (308) and a drilling channel (309). The drilling channel (309) is arranged vertically. The pre-exploration sleeve (310) is slidably fitted inside the pre-exploration channel (308). A pre-probe (311) is provided at the bottom of the pre-exploration sleeve (310). The bottom height of the pre-probe (311) is flush with the bottom height of the pre-exploration channel (308). A first spring (312) is provided between the pre-exploration sleeve (310) and the pre-probe (311).

2. The adjustable depth limiting oral bone harvesting drill mechanism according to claim 1, characterized in that, The sliding core (306) has several second limiting rods (313) fixed inside. The pre-probing sleeve (310) has several ear plates (314) integrally formed. The ear plates (314) are slidably sleeved on the surface of the second limiting rods (313). One of the ear plates (314) has a driving block (315) fixed on it. The top and bottom of the driving block (315) are both inclined surfaces.

3. The adjustable depth limiting oral bone harvesting drill mechanism according to claim 2, characterized in that, The sliding core (306) has a first receiving cavity (316) inside, and a first locking block (317) is slidably disposed inside the first receiving cavity (316). The first locking block (317) is located above the driving block (315), and a third spring (318) is disposed inside the first locking block (317) and the first receiving cavity (316).

4. The adjustable depth limiting oral bone harvesting drill mechanism according to claim 3, characterized in that, The first locking block (317) is fixed with a first locking pin (319) on the side away from the pre-exploration sleeve (310), and a first positioning hole (320) is provided between the sliding core (306) and the guide sleeve (302).

5. The adjustable depth limiting oral bone harvesting drill mechanism according to claim 2, characterized in that, The sliding core (306) has a second receiving cavity (321) inside, and a lifting seat (322) is slidably arranged inside the second receiving cavity (321). A second locking block (323) is slidably arranged on the lifting seat (322). The second locking block (323) is located below the driving block (315). A fourth spring (324) is arranged between the second locking block (323) and the lifting seat (322).

6. The adjustable depth limiting oral bone harvesting drill mechanism according to claim 5, characterized in that, The second locking block (323) is fixed with a second locking pin (325) on the side away from the pre-exploration sleeve (310). A number of second positioning holes (326) are provided between the sliding core (306) and the guide sleeve (302). The number of second positioning holes (326) are arranged in an array along the vertical direction of the guide sleeve (302).

7. The adjustable depth limiting oral bone harvesting drill mechanism according to claim 5, characterized in that, A threaded sleeve (327) is rotatably mounted on the lifting seat (322) via a bearing. A threaded rod (328) is fixedly mounted on the second locking block (323). The threaded rod (328) is threadedly mounted inside the threaded sleeve (327). A ratchet (329) is coaxially fixed on the surface of the threaded sleeve (327). A pawl (330) is rotatably mounted on the lifting seat (322).

8. The adjustable depth limiting oral bone harvesting drill mechanism according to claim 1, characterized in that, The sliding core (306) is provided with a stroke locking mechanism, which includes a connecting rod (401). The connecting rod (401) is fixed on the top of the pre-probe (311), and a driving head (402) is fixed on the top of the connecting rod (401).

9. The adjustable depth limiting oral bone harvesting drill mechanism according to claim 8, characterized in that, The sliding core (306) has a third receiving cavity (403) inside, and a third locking block (404) is slidably arranged inside the third receiving cavity (403). The third locking block (404) is located above the driving head (402), and a fifth spring (405) is arranged between the third locking block (404) and the inner wall of the third receiving cavity (403).

10. The adjustable depth limiting oral bone harvesting drill mechanism according to claim 9, characterized in that, The third locking block (404) is fixed with a third locking pin (406) on the side away from the fifth spring (405), and the inner wall of the sliding core (306) is provided with a number of third positioning holes (407) in the vertical direction.

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