A precise orthopedic guide tap assembly with depth limiting and a processing method thereof

Abstract

This invention relates to the field of orthopedic tap technology, and more particularly to an orthopedic precision guide tap assembly with depth limiting and its processing method. The assembly includes a connector and a support sleeve. The support sleeve is fixedly welded to the lower part of the connector. A depth adjustment mechanism is installed inside the support sleeve. A transmission rack is meshed with one side of the depth adjustment mechanism, extending to the lower part of the support sleeve. A depth limiting mechanism is fixedly connected to the bottom end of the transmission rack. A guide tap body is fixedly connected to the lower part of the depth adjustment mechanism. The outer side of the guide tap body slides against the inner side of the depth limiting mechanism. The depth adjustment mechanism includes an adjustment base, and a transmission support seat is fixedly connected to one side of the upper surface of the adjustment base. This invention enables precise adjustment and mechanical limiting of the tapping depth during orthopedic tapping surgery, solving the problem that traditional taps rely on experience to judge the depth, which can easily result in taps being too deep or too shallow, thus improving screw fixation stability and surgical safety.

Description

Technical Field

[0001] This invention relates to the field of orthopedic tap technology, specifically to an orthopedic precision guide tap assembly with depth limiting and its processing method. Background Technology

[0002] In orthopedic clinical surgery, internal screw fixation is one of the core procedures for treating orthopedic diseases such as fractures and spinal disorders. As a key processing instrument in this procedure, the tap's main function is to create precise internal threads in the bone, providing a stable assembly base for the subsequent implantation of fixation devices such as screws and plates. This enables the reduction, fixation, and healing support of the injured bone surface. The tapping accuracy and operational stability of the tap directly determine the dimensional accuracy and surface quality of the threaded hole. The quality of the threaded hole is closely related to the implantation stability of the fixation device, ultimately affecting the surgical efficacy and the patient's postoperative recovery process. The performance and accuracy of orthopedic taps are crucial to the success of orthopedic surgery and are one of the key prerequisites for ensuring the recovery of limb function after surgery.

[0003] Currently, traditional orthopedic taps widely used in clinical practice still have many limitations. The most prominent problem is the lack of an effective depth limiting device. The drilling depth during the tapping process relies entirely on the surgeon's clinical experience and feel, making it difficult to achieve precise control of the tapping depth. Due to differences in bone quality and fracture location among different patients, and the confined operating space and complex anatomical structure of orthopedic surgery, relying solely on experience to control the depth is prone to deviation. A tapping depth that is too shallow will result in insufficient thread engagement after screw implantation, leading to insecure fixation and complications such as loosening and dislodgement, which will affect fracture healing. A tapping depth that is too deep may penetrate the contralateral cortical bone, damaging surrounding blood vessels, nerves, and other important tissues, causing serious surgical risks. It will also reduce the clamping force of the bone on the screw, affecting the fixation effect. Therefore, this paper proposes an orthopedic precision guide tap assembly with depth limiting and its processing method to address the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide an orthopedic precision guide tap assembly with depth limiting and its processing method, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A precision orthopedic guide tap assembly with depth limiting includes a connector and a support sleeve. The support sleeve is fixedly welded to the lower part of the connector. A depth adjustment mechanism is installed inside the support sleeve. A transmission rack is meshed with one side of the depth adjustment mechanism. The transmission rack extends to the lower part of the support sleeve. A depth limiting mechanism is fixedly connected to the bottom end of the transmission rack. A guide tap body is fixedly connected to the lower part of the depth adjustment mechanism. The outer side of the guide tap body slides with the inner side of the depth limiting mechanism. The depth adjustment mechanism includes an adjustment base. A transmission support seat is fixedly connected to one side of the upper surface of the adjustment base. A gear transmission mechanism is rotatably connected inside the transmission support seat. An active adjustment component is installed in front of the gear transmission mechanism. A return spring telescopic rod is installed behind the gear transmission mechanism. A rack limiting mechanism for limiting the transmission rack is installed on the other side of the upper surface of the adjustment base.

[0007] As a further optimization of the present invention, the toothed transmission mechanism includes a composite transmission wheel, the outer side of which is integrally formed with a plurality of active transmission gear rings arranged in a circular array, the front end face of which is integrally formed with a plurality of driven meshing tooth grooves arranged in a circular array, a linkage push rod slidably connected at the center of the inner side of the composite transmission wheel, and the rear end of the linkage push rod integrally formed with a hemispherical push head.

[0008] As a further optimization of the present invention, the active adjustment component includes an internal hexagon adjustment knob, the rear end face of which is integrally formed with a plurality of active meshing teeth in a circular array, the active transmission gear ring meshing with the transmission rack, the front end face of the internal hexagon adjustment knob having an internal hexagon operating cavity, the internal hexagon operating cavity having a locking bolt installed inside, and the threaded end of the locking bolt being threadedly connected to the inner side of the driven meshing tooth groove.

[0009] As a further optimization of the present invention, the rack limiting mechanism includes a flip-limiting lever with a rack engaging groove at its front end. The front end of the flip-limiting lever extends into the root of the transmission rack. An elastic support seat is fixedly connected to the rear end of the flip-limiting lever. A reset support spring is fixedly connected below the elastic support seat. The bottom end of the reset support spring is fixedly connected to the upper surface of the adjusting base. A rotating connecting shaft is fixedly connected to the inner corner area of ​​the flip-limiting lever. The rotating connecting shaft is rotatably connected to the inner side of the support sleeve.

[0010] As a further optimization of the present invention, the active meshing tooth block is located in front of the driven meshing tooth groove, and the active meshing tooth block is adapted to the driven meshing tooth groove.

[0011] As a further optimization of the present invention, the front end of the linkage rod is in contact with the back of the composite transmission wheel, the rear end of the linkage rod has a hemispherical structure, and the rear end face of the linkage rod slides in contact with the bottom of the flip-limiting folding rod.

[0012] As a further optimization of the present invention, the telescopic end of the return spring telescopic rod is fixedly connected to the center of the rear end of the hemispherical push head, and the fixed end of the return spring telescopic rod is fixedly connected to the inner wall of the gear transmission mechanism.

[0013] As a further optimization of the present invention, the axis of the guide tap body is collinear with the axis of the support sleeve and the axis of the connector, and the top end of the guide tap body is fixedly connected to the center of the bottom end of the adjusting base.

[0014] As a further optimization of the present invention, an operating through hole is provided on one side of the support sleeve, and the position of the operating through hole corresponds to the position of the internal hexagon adjustment knob.

[0015] A method for manufacturing a precision guide tap assembly for orthopedics with depth limiting:

[0016] Step 1: The connector, support sleeve, and adjusting base are made of 304 stainless steel bar and CNC machined into corresponding blanks to ensure that the coaxiality tolerance of the shaft is less than 0.02mm. The guide tap body is made of medical high-speed steel and hot-rolled into a tap blank with a pre-reserved tapping allowance. The transmission rack is made of stainless steel plate and laser-cut into a strip blank. The depth limiting mechanism is made of stainless steel plate and stamped into a disc blank with a pre-reserved machining allowance for the center hole.

[0017] Step 2: The composite transmission wheel is CNC milled on the blank to produce the active transmission gear ring and the driven meshing gear groove. Then, the center sliding hole is machined by wire cutting. The internal hexagonal adjustment knob is milled to produce the internal hexagonal operating cavity. The active meshing gear block is machined by turning. The rack engagement groove is milled. The assembly hole of the rotary connecting shaft is drilled. The linkage push rod and the hemispherical push head are machined as a whole to ensure that the roundness tolerance of the hemispherical surface is less than 0.01mm.

[0018] Step 3: The guide tap body is quenched and tempered to achieve a hardness of HRC60-62. The transmission rack and composite transmission wheel are surface carburized to achieve a carburized layer depth of 0.8-1.2mm and a hardness of HRC58-60.

[0019] Step 4: Fix the return spring telescopic rod to the inner wall of the gear transmission mechanism, insert the linkage push rod into the center sliding hole of the composite transmission wheel, connect the hemispherical push head to the telescopic end of the return spring telescopic rod, install the active adjustment component on the transmission support seat through locking bolts, install the rack limiting mechanism on the adjustment base through the rotating connecting shaft, weld the support sleeve to the bottom of the connector, fix the depth adjustment mechanism inside the support sleeve, mesh the transmission rack with the active transmission gear ring, and bolt the bottom end to the depth limiting mechanism. Weld the top of the guide tap body to the center of the adjustment base to ensure that the guide tap body, support sleeve, and connector head are collinear.

[0020] Step 5: Use a coordinate measuring machine to check the fit clearance of each component. The depth adjustment accuracy error is less than 0.1mm. Check the sliding fit between the depth limiting mechanism and the guide tap body. There is no jamming.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. In this invention, the depth adjustment mechanism, transmission rack and depth limiting mechanism can be set to achieve precise adjustment and mechanical limiting of tapping depth in orthopedic tapping surgery, solving the problem that traditional taps rely on experience to judge the depth and are easy to be too deep or too shallow, thus improving the stability of screw fixation and surgical safety.

[0023] 2. In this invention, the active adjustment component and the rack and pinion limiting mechanism enable integrated operation of pressing to unlock, rotating to adjust, and releasing to automatically lock. The adjustment process is simple and reliable, requiring no additional tools to assist in locking, and effectively avoiding unexpected changes in depth during surgery.

[0024] 3. In this invention, the internal hexagonal adjustment knob, the composite transmission wheel and the linkage rod are connected by a locking bolt. The detachable connection structure facilitates the disassembly, inspection and maintenance of each component, reduces the maintenance cost of the instrument and extends the overall service life. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the present invention;

[0026] Figure 2 This is a cross-sectional structural diagram of the support sleeve of the present invention;

[0027] Figure 3 This is a schematic diagram of the depth adjustment mechanism of the present invention;

[0028] Figure 4 This is a schematic diagram of the rear structure of the depth adjustment mechanism of the present invention;

[0029] Figure 5 This is a schematic diagram of the structure of the adjusting base of the present invention;

[0030] Figure 6 This is a schematic diagram of the internal hexagonal adjustment knob of the present invention;

[0031] Figure 7 This is a schematic diagram showing the disassembled structure of the gear transmission mechanism and the active adjustment component of the present invention;

[0032] Figure 8 This is a schematic diagram of the disassembled structure of the gear transmission mechanism of the present invention;

[0033] Figure 9 This is a schematic diagram of the rack and pinion limiting mechanism of the present invention.

[0034] In the diagram: 1. Connector; 2. Support sleeve; 3. Depth adjustment mechanism; 4. Transmission rack; 5. Depth limiting mechanism; 6. Guide tap body; 7. Operating through hole;

[0035] 30. Adjustable base; 31. Transmission support base; 32. Gear transmission mechanism; 33. Active adjustment component; 34. Return spring telescopic rod; 35. Rack and pinion limiting mechanism;

[0036] 321. Composite transmission wheel; 322. Driven transmission gear ring; 323. Driven meshing tooth groove; 324. Linkage push rod; 325. Hemispherical push head;

[0037] 331. Hexagonal adjustment knob; 332. Active engagement gear block; 333. Hexagonal operating chamber; 334. Locking bolt;

[0038] 351. Flip-off limiting lever; 352. Rack and pinion engaging groove; 353. Elastic support seat; 354. Reset support spring; 355. Rotary connecting shaft. Detailed Implementation

[0039] Please see Figures 1-9 The present invention provides a technical solution:

[0040] A precision orthopedic guide tap assembly with depth limiting includes a connector 1 and a support sleeve 2. The support sleeve 2 is fixedly welded to the lower part of the connector 1. A depth adjustment mechanism 3 is installed inside the support sleeve 2. A transmission rack 4 is meshed with one side of the depth adjustment mechanism 3. The transmission rack 4 extends to the lower part of the support sleeve 2. A depth limiting mechanism 5 is fixedly connected to the bottom end of the transmission rack 4. A guide tap body 6 is fixedly connected to the lower part of the depth adjustment mechanism 3. The outer side of the guide tap body 6 slides with the inner side of the depth limiting mechanism 5. The depth adjustment mechanism 3 includes an adjustment base 30. A transmission support seat 31 is fixedly connected to one side of the upper surface of the adjustment base 30. A gear transmission mechanism 32 is rotatably connected inside the transmission support seat 31. An active adjustment component 33 is installed in front of the gear transmission mechanism 32. A return spring telescopic rod 34 is installed behind the gear transmission mechanism 32. A rack limiting mechanism 35 for limiting the transmission rack 4 is installed on the other side of the upper surface of the adjustment base 30.

[0041] As a further implementation of this solution, the gear transmission mechanism 32 includes a composite transmission wheel 321. The outer side of the composite transmission wheel 321 is integrally formed with multiple active transmission gear rings 322 arranged in a circular array. The front end face of the composite transmission wheel 321 is integrally formed with multiple driven meshing tooth grooves 323 arranged in a circular array. A linkage push rod 324 is slidably connected at the center of the inner side of the composite transmission wheel 321. The rear end of the linkage push rod 324 is integrally formed with a hemispherical push head 325, so that the composite transmission wheel 321 can simultaneously realize the meshing transmission with the transmission rack 4 and the linkage unlocking of the rack limiting mechanism 35, ensuring that the adjustment action and the unlocking action are completed synchronously.

[0042] As a further implementation of this solution, the active adjustment component 33 includes an internal hexagon adjustment knob 331. The rear end face of the internal hexagon adjustment knob 331 is integrally formed with multiple active meshing tooth blocks 332 arranged in a circular array. The active transmission gear ring 322 is meshed with the transmission rack 4. The front end face of the internal hexagon adjustment knob 331 is provided with an internal hexagon operating cavity 333. A locking bolt 334 is installed inside the internal hexagon operating cavity 333. The threaded end of the locking bolt 334 is threadedly connected to the inner side of the driven meshing tooth groove 323. The internal hexagon adjustment knob 331 and the active meshing tooth blocks 332 are used to facilitate the operation of tools during surgery. At the same time, the locking bolt 334 improves the convenience of assembly.

[0043] As a further implementation of this solution, the rack limiting mechanism 35 includes a flip-limiting lever 351. The front end of the flip-limiting lever 351 is provided with a rack engaging groove 352. The front end of the flip-limiting lever 351 extends into the root of the transmission rack 4. The rear end of the flip-limiting lever 351 is fixedly connected to an elastic support seat 353. A reset support spring 354 is fixedly connected below the elastic support seat 353. The bottom end of the reset support spring 354 is fixedly connected to the upper surface of the adjusting base 30. A rotating connecting shaft 355 is fixedly connected to the corner area inside the flip-limiting lever 351. The rotating connecting shaft 355 is rotatably connected to the inner side of the support sleeve 2. The flip-limiting lever 351 and the reset support spring 354 are used to automatically lock and limit the transmission rack 4, effectively preventing the depth limiting mechanism 5 from displacing during the tapping process and ensuring a constant tapping depth.

[0044] As a further implementation of this solution, the active engagement tooth block 332 is located in front of the driven engagement tooth groove 323, and the active engagement tooth block 332 is adapted to the driven engagement tooth groove 323 to achieve the engagement and disengagement effect of pressing and engaging, and avoids accidental changes in depth in the non-adjustment state.

[0045] As a further implementation of this solution, the front end of the linkage rod 324 is in contact with the back of the composite transmission wheel 321, the rear end of the linkage rod 324 has a hemispherical structure, and the rear end face of the linkage rod 324 slides with the bottom of the flipping limit lever 351 to reduce component wear and jamming, and make the rack limit mechanism 35 unlocking action sensitive and smooth.

[0046] As a further implementation of this solution, the telescopic end of the reset spring telescopic rod 34 is fixedly connected to the center of the rear end of the hemispherical push head 325, and the fixed end of the reset spring telescopic rod 34 is fixedly connected to the inner wall of the gear transmission mechanism 32, so as to realize the automatic reset of the linkage push rod 324 and the internal hexagon adjustment knob 331. After the adjustment is completed, it immediately returns to the locked state without manual reset.

[0047] As a further implementation of this scheme, the axis of the guide tap body 6 is collinear with the axis of the support sleeve 2 and the axis of the connector 1. The top of the guide tap body 6 is fixedly connected to the center of the bottom of the adjusting base 30 to ensure that the guide tap body 6 rotates stably without eccentricity and the tapping path is straight.

[0048] As a further implementation of this solution, an operating through hole 7 is provided on one side of the support sleeve 2. The position of the operating through hole 7 corresponds to the position of the internal hexagon adjustment knob 331, providing a precise operating channel for the internal hexagon adjustment knob 331 and adapting to the narrow operating space of orthopedic surgery.

[0049] A processing method for an orthopedic precision guide tap assembly with depth limiting: The connector 1, support sleeve 2, and adjusting base 30 are made of 304 stainless steel bar and are CNC machined into corresponding blanks to ensure that the coaxiality tolerance of the axis is less than 0.02mm. The guide tap body 6 is made of medical high-speed steel and is hot-rolled into a tap blank with a reserved tapping allowance. The transmission rack 4 is made of stainless steel plate and is laser-cut into a strip blank. The depth limiting mechanism 5 is made of stainless steel plate and is stamped into a disc blank with a reserved machining allowance for the center hole.

[0050] The composite transmission wheel 321 is CNC milled to produce the active transmission gear ring 322 and the driven meshing gear groove 323. The center sliding hole is then machined by wire cutting. The internal hexagonal adjustment knob 331 is milled to produce the internal hexagonal operating cavity 333. The active meshing gear block 332 is turned. The rack engagement groove 352 is milled. The assembly hole of the rotary connecting shaft 355 is drilled. The linkage push rod 324 and the hemispherical push head 325 are integrally turned to ensure that the roundness tolerance of the hemispherical surface is less than 0.01mm.

[0051] The guide tap body 6 is quenched at 850-880℃ and tempered at 200-220℃, with a hardness of HRC60-62. The transmission rack 4 and the composite transmission wheel 321 are surface carburized, with a carburized layer depth of 0.8-1.2mm and a hardness of HRC58-60.

[0052] The return spring telescopic rod 34 is fixed to the inner wall of the gear transmission mechanism 32. The linkage push rod 324 is inserted into the central sliding hole of the composite transmission wheel 321. The hemispherical push head 325 is connected to the telescopic end of the return spring telescopic rod 34. The active adjustment component 33 is installed on the transmission support base 31 through the locking bolt 334. The rack limiting mechanism 35 is installed on the adjustment base 30 through the rotating connecting shaft 355. The support sleeve 2 is welded to the bottom of the connector 1. The depth adjustment mechanism 3 is fixed inside the support sleeve 2. The transmission rack 4 meshes with the active transmission gear ring 322. The bottom end is bolted to the depth limiting mechanism 5. The top of the guide tap body 6 is welded to the center of the adjustment base 30 to ensure that the guide tap body 6, the support sleeve 2, and the connector 1 are coaxial.

[0053] The clearance between each component was checked using a coordinate measuring machine. The depth adjustment accuracy error was less than 0.1 mm. The sliding fit between the depth limiting mechanism 5 and the guide tap body 6 was checked, and there was no jamming.

[0054] Work process: Insert the Allen wrench into the operating through hole 7 of the support sleeve 2 and embed it into the Allen operating cavity 333 of the Allen adjustment knob 331 to prepare for depth adjustment. Apply force inward with the Allen wrench to push the Allen adjustment knob 331 towards the composite transmission wheel 321. The active engagement tooth block 332 moves forward synchronously. At the same time, pressure is applied to drive the linkage push rod 324 to slide backward. The hemispherical push head 325 presses the outside of the flip limit lever 351, causing the flip limit lever 351 to rotate around the rotating connecting shaft 355. The rack engagement groove 352 disengages from the root of the transmission rack 4, releasing the lock of the rack limit mechanism 35.

[0055] Rotate the Allen wrench, and the Allen adjustment knob 331 drives the composite transmission wheel 321 to rotate through the active meshing tooth block 332. The active transmission gear ring 322 of the composite transmission wheel 321 meshes with the transmission rack 4, driving the transmission rack 4 to move vertically along the support sleeve 2. The transmission rack 4 drives the depth limiting mechanism 5 to slide on the outside of the guide tap body 6 until the depth limiting mechanism 5 moves to the preset tapping depth position.

[0056] Remove the Allen wrench, and the elastic restoring force of the reset spring telescopic rod 34 pushes the linkage top rod 324 and the hemispherical push head 325 forward. The Allen adjustment knob 331 is reset simultaneously, the active meshing tooth block 332 separates from the driven meshing tooth groove 323, and at the same time, the elastic force of the reset support spring 354 pushes the elastic support seat 353, so that the flip limit lever 351 is reset, and the rack engaging the inclined groove 352 is re-engaged into the tooth root of the transmission rack 4, completing the depth limit locking.

[0057] Connect connector 1 to the surgical power device. Start the device to drive the guide tap body 6 to rotate and tap into the patient's bone. When the depth limiting mechanism 5 is in contact with the bone surface, the tapping stops, thus achieving precise limiting of the tapping depth.

[0058] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only for the purpose of helping to understand the method and core ideas of the present invention. The above descriptions are only preferred embodiments of the present invention. It should be noted that due to the limitations of textual expression, while there are objectively infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of the present invention.

Claims

1. An orthopedic precision guide tap assembly with depth limiting, comprising a connector (1) and a support sleeve (2), characterized in that: A support sleeve (2) is fixedly welded to the bottom of the connector (1). A depth adjustment mechanism (3) is installed inside the support sleeve (2). A transmission rack (4) is meshed with one side of the depth adjustment mechanism (3). The transmission rack (4) extends to the bottom of the support sleeve (2). A depth limiting mechanism (5) is fixedly connected to the bottom of the transmission rack (4). A guide tap body (6) is fixedly connected to the bottom of the depth adjustment mechanism (3). The outer side of the guide tap body (6) slides with the inner side of the depth limiting mechanism (5). The depth adjustment mechanism (3) includes an adjustment base (30), a transmission support seat (31) is fixedly connected to one side of the upper surface of the adjustment base (30), a gear transmission mechanism (32) is rotatably connected inside the transmission support seat (31), an active adjustment component (33) is installed in front of the gear transmission mechanism (32), a return spring telescopic rod (34) is installed behind the gear transmission mechanism (32), and a rack limiting mechanism (35) for limiting the transmission rack (4) is installed on the other side of the upper surface of the adjustment base (30).

2. The orthopedic precision guide tap assembly with depth limiting according to claim 1, characterized in that: The gear transmission mechanism (32) includes a composite transmission wheel (321). The outer side of the composite transmission wheel (321) is integrally formed with multiple active transmission gear rings (322) arranged in a circular array. The front end face of the composite transmission wheel (321) is integrally formed with multiple driven meshing tooth grooves (323) arranged in a circular array. A linkage push rod (324) is slidably connected at the center of the inner side of the composite transmission wheel (321). The rear end of the linkage push rod (324) is integrally formed with a hemispherical push head (325).

3. The orthopedic precision guide tap assembly with depth limiting according to claim 2, characterized in that: The active adjustment component (33) includes an internal hexagon adjustment knob (331). The rear end face of the internal hexagon adjustment knob (331) is integrally formed with a plurality of active meshing teeth (332) arranged in a circular array. The active transmission gear ring (322) is meshed with the transmission rack (4). The front end face of the internal hexagon adjustment knob (331) is provided with an internal hexagon operating cavity (333). A locking bolt (334) is installed inside the internal hexagon operating cavity (333). The threaded end of the locking bolt (334) is threadedly connected to the inner side of the driven meshing tooth groove (323).

4. The orthopedic precision guide tap assembly with depth limiting according to claim 2, characterized in that: The rack limiting mechanism (35) includes a flip limiting lever (351), the front end of which is provided with a rack engaging groove (352), the front end of which extends into the root of the transmission rack (4), the rear end of which is fixedly connected to an elastic support seat (353), the lower end of which is fixedly connected to a reset support spring (354), the bottom end of which is fixedly connected to the upper surface of the adjusting base (30), and the inner corner area of ​​the flip limiting lever (351) is fixedly connected to a rotating connecting shaft (355), which is rotatably connected to the inner side of the support sleeve (2).

5. The orthopedic precision guide tap assembly with depth limiting according to claim 3, characterized in that: The active meshing tooth block (332) is located in front of the driven meshing tooth groove (323), and the active meshing tooth block (332) is adapted to the driven meshing tooth groove (323).

6. The orthopedic precision guide tap assembly with depth limiting according to claim 4, characterized in that: The front end of the linkage rod (324) is in contact with the back of the composite transmission wheel (321), the rear end of the linkage rod (324) is hemispherical, and the rear end face of the linkage rod (324) slides in contact with the bottom of the flip-limiting folding rod (351).

7. The orthopedic precision guide tap assembly with depth limiting according to claim 1, characterized in that: The telescopic end of the reset spring telescopic rod (34) is fixedly connected to the center of the rear end of the hemispherical push head (325), and the fixed end of the reset spring telescopic rod (34) is fixedly connected to the inner wall of the gear transmission mechanism (32).

8. The orthopedic precision guide tap assembly with depth limiting according to claim 1, characterized in that: The axis of the guide tap body (6) is collinear with the axis of the support sleeve (2) and the axis of the connector (1), and the top end of the guide tap body (6) is fixedly connected to the center of the bottom end of the adjusting base (30).

9. The orthopedic precision guide tap assembly with depth limiting according to claim 1, characterized in that: The support sleeve (2) has an operation through hole (7) on one side, and the position of the operation through hole (7) corresponds to the position of the internal hexagon adjustment knob (331).

10. A method for processing an orthopedic precision guide tap assembly with depth limiting according to any one of claims 1-9, characterized in that: Step 1: The connector (1), support sleeve (2), and adjusting base (30) are made of 304 stainless steel bar and are CNC machined into corresponding blanks to ensure that the coaxiality tolerance of the shaft is less than 0.02mm. The guide tap body (6) is made of medical high-speed steel and is hot rolled into a tap blank with a reserved tapping allowance. The transmission rack (4) is made of stainless steel plate and is laser cut into a strip blank. The depth limiting mechanism (5) is made of stainless steel plate and is stamped into a disc blank with a reserved center hole machining allowance. Step 2: The composite transmission wheel (321) is CNC milled on the blank to produce the active transmission gear ring (322) and the driven meshing gear groove (323). The center sliding hole is then machined by wire cutting. The internal hexagonal adjustment knob (331) is milled to produce the internal hexagonal operating cavity (333). The active meshing gear block (332) is machined by turning. The rack engagement groove (352) is milled. The assembly hole of the rotary connecting shaft (355) is drilled. The linkage push rod (324) and the hemispherical push head (325) are machined into one piece to ensure that the roundness tolerance of the hemispherical surface is less than 0.01mm. Step 3: The guide tap body (6) is quenched (temperature 850-880℃) and tempered (temperature 200-220℃) to achieve a hardness of HRC60-62. The transmission rack (4) and the composite transmission wheel (321) are surface carburized to achieve a carburized layer depth of 0.8-1.2mm and a hardness of HRC58-60. Step 4: Fix the return spring telescopic rod (34) to the inner wall of the gear transmission mechanism (32), insert the linkage top rod (324) into the center sliding hole of the composite transmission wheel (321), connect the hemispherical push head (325) to the telescopic end of the return spring telescopic rod (34), install the active adjustment component (33) on the transmission support seat (31) through the locking bolt (334), install the rack limiting mechanism (35) on the adjustment base (30) through the rotating connecting shaft (355), weld the support sleeve (2) to the bottom of the connector (1), fix the depth adjustment mechanism (3) inside the support sleeve (2), mesh the transmission rack (4) with the active transmission gear ring (322), and bolt the bottom end to the depth limiting mechanism (5). Weld the top of the guide tap body (6) to the center of the adjustment base (30) to ensure that the guide tap body (6), the support sleeve (2), and the connector (1) are coaxial. Step 5: Use a coordinate measuring machine to check the fit clearance of each component. The depth adjustment accuracy error is less than 0.1mm. Check the sliding fit between the depth limiting mechanism (5) and the guide tap body (6). There is no jamming phenomenon.

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