Depth-limiting percutaneous trephine device and using method thereof

Abstract

The depth-limiting percutaneous trephine device comprises a sleeve, a trephine and a drill bit, a first through hole is formed in the sleeve, a second through hole is formed in the trephine, the trephine comprises a saw barrel and a limiting barrel which are connected with each other in the axial direction, sawteeth are arranged at the end, away from the limiting barrel, of the saw barrel, and the saw barrel of the trephine can be arranged in the first through hole of the sleeve in a sleeved mode; the outer diameter of the limiting cylinder is greater than the inner diameter of the first through hole of the sleeve; the drill bit comprises a guide pin part and an extension part which are connected with each other in the axial direction, the outer diameter of the guide pin part is smaller than that of the extension part, and the extension part can be sleeved with the second through hole of the trephine; a first depth limiting piece and a second depth limiting piece are movably arranged on the trephine and the drill bit respectively, when the trephine is sleeved with the sleeve, and the drill bit is sleeved with the trephine, the first depth limiting piece is located between the sleeve and a limiting barrel of the trephine, and the second depth limiting piece is located on the upper side of the trephine. Through cooperative use of the sleeve, the trephine and the drill bit, double precise depth limiting can be achieved, and the safety and efficiency of the trephine are greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of surgical instruments, in particular to a depth-limited percutaneous trephine device and a use method thereof. Background Art

[0002] In minimally invasive percutaneous trephine bone harvesting or percutaneous osteophyte resection decompression, facet plasty, anterior cervical decompression and other operations, safety is the biggest challenge because direct vision is not possible. The main unsafe factor comes from the inability to accurately limit the depth in real time. It is impossible to fully ensure accurate depth control by hand feel or only partial depth control function, and it is also impossible to fully ensure safety. At present, all percutaneous trephine devices have no special depth control or have partial segmented depth control, and there is no trephine device with completely real-time and accurate depth control. Summary of the invention

[0003] In order to address the deficiencies in the prior art, the present invention provides a depth-limiting percutaneous ring saw device and a method of using the same, which can achieve real-time depth limiting and dual-precision depth limiting, greatly improving the safety and efficiency of the ring saw, and can quickly and easily complete operations of many ring saws with high-precision requirements, greatly improving the safety and efficiency of such operations, and solving difficult clinical problems that could not be solved by previous percutaneous minimally invasive surgeries.

[0004] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0005] The present invention provides a depth-limited percutaneous trephine device, comprising:

[0006] A sleeve, wherein a first through hole is provided on the sleeve and penetrates the sleeve in the axial direction;

[0007] A ring saw, wherein a second through hole is provided on the ring saw and passes through the ring saw in the axial direction, the ring saw comprises a saw barrel and a stop barrel connected to each other in the axial direction, saw teeth are provided at the end of the saw barrel facing away from the stop barrel, the saw barrel of the ring saw can be sleeved in the first through hole of the sleeve, and the outer diameter of the stop barrel is larger than the inner diameter of the first through hole of the sleeve;

[0008] A drill bit, the drill bit comprising a guide needle portion and an extension portion connected to each other along the axial direction, the outer diameter of the guide needle portion is smaller than the outer diameter of the extension portion, and the extension portion can be sleeved in the second through hole of the trephine;

[0009] A first depth limiter is arranged on the saw barrel of the ring saw, and the first depth limiter is positioned along the axial direction of the saw barrel; a second depth limiter is arranged on the extension part of the drill bit, and the second depth limiter is positioned along the axial direction of the extension part; when the ring saw is sleeved in the sleeve and the drill bit is sleeved in the ring saw, the first depth limiter is located between the sleeve and the limiting cylinder of the ring saw, and the second depth limiter is located on the upper side of the ring saw.

[0010] A depth-limited percutaneous circumcision device also includes a pencil-type soft tissue opener guide rod that can be sleeved in the first through hole of the sleeve, the pencil-type soft tissue opener guide rod is provided with a third through hole that penetrates along its axial direction, and a guide wire is movably arranged in the third through hole.

[0011] The first depth limiting member is threadedly connected to the saw barrel of the ring saw; or the first depth limiting member is slidably connected to the saw barrel of the ring saw, and a first locking member is provided on the first depth limiting member to fasten it to the saw barrel.

[0012] The second depth limiter is threadedly connected to the extension portion of the drill bit; or the second depth limiter is slidably connected to the extension portion of the drill bit, and a second locking member is provided on the second depth limiter to fasten it to the extension portion.

[0013] The saw barrel of the ring saw and the extension part of the drill bit are both provided with scale scales extending in the axial direction.

[0014] The scales on the saw barrel and the extension are marked from bottom to top. When the ring saw is flush with the bottom end of the sleeve, the corresponding position of the top end of the sleeve is the "0" point of the scale on the saw barrel; the scale on the extension is arranged in two groups. When the drill bit is flush with the bottom end of the sleeve, the corresponding position of the top end of the sleeve is the "0" point of the first group of scales on the extension; when the drill bit is flush with the bottom end of the ring saw, the corresponding position of the top end of the ring saw is the "0" point of the second group of scales on the extension.

[0015] A handle is arranged at the top end of the sleeve, and a grip is arranged at the top end of the limiting cylinder of the ring saw.

[0016] The handle and the grip are provided with an anti-slip structure.

[0017] The length of the sleeve is 13 cm, the outer diameter is 12 mm, and the inner diameter of the first through hole of the sleeve is greater than or equal to 10 mm;

[0018] The saw barrel of the ring saw has a length of 20 cm and an outer diameter of 10 mm; the limiter barrel of the ring saw has a length of 5 cm and an outer diameter of 15 mm; the inner diameter of the second through hole of the ring saw is greater than or equal to 3 mm;

[0019] The guide needle portion of the drill bit is a Kirschner wire structure with a diameter of 1.5 mm and a length of 7 cm; the extension portion of the drill bit is 33 cm long and has an outer diameter of 3 mm.

[0020] The pencil-type soft tissue opener guide rod has a length of 25 cm, an outer diameter of 10 mm, an outer diameter of the tip of 3 mm, and an inner diameter of the third through hole of 1 mm;

[0021] The guide wire has a length of 40 cm and an outer diameter of 0.9 mm.

[0022] The present invention also provides a method for using a depth-limited percutaneous trephine device, comprising the following steps:

[0023] (1) The sleeve is used to expand the soft tissue, the ring saw is placed in the sleeve, and the drill bit is placed in the ring saw;

[0024] (2) adjusting the position of the second depth stopper at the extension portion of the drill bit so that the guide needle portion of the drill bit drills into the bone block, and when the second depth stopper contacts the ring saw, the drill bit is locked;

[0025] (3) adjusting the position of the first depth limiter on the saw barrel of the ring saw, rotating the ring saw to ring saw the bone block, and when the first depth limiter contacts the sleeve, the ring saw is locked;

[0026] (4) Repeat steps (2) and (3) several times until the drill bit reaches the target position and the ring saw penetrates the bone block.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows: the depth-limiting percutaneous ring saw device of the present invention can be used in conjunction with a sleeve and a ring saw, or a sleeve and a drill bit, and a sleeve, a ring saw and a drill bit can also be used in conjunction with each other, thereby improving the scope of application; and when the sleeve, the ring saw and the drill bit are used together, real-time double precision depth limiting can be achieved, thereby greatly improving the safety and efficiency of the ring saw, and the operation of many ring saws with high precision requirements can be completed quickly and easily, thereby greatly improving the safety and efficiency of such operations, and solving clinical problems that could not be solved by previous percutaneous minimally invasive surgeries. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Attached Figure 1 It is a structural schematic diagram of the present invention.

[0029] Attached Figure 2 It is a structural schematic diagram of the ring saw and the sleeve of the present invention used in combination.

[0030] Attached Figure 3 It is a structural schematic diagram of the drill bit and the sleeve of the present invention used in combination.

[0031] Attached Figure 4 It is a structural schematic diagram of the drill bit, the ring saw and the sleeve of the present invention used in combination.

[0032] Attached Figure 5 The invention is a schematic structural diagram of the pencil-type soft tissue opener guide rod and the sleeve used in combination.

[0033] The numbers shown in the accompanying drawings are: 1. sleeve; 11. first through hole; 12. handle; 2. ring saw; 21. second through hole; 22. saw cylinder; 23. limiting cylinder; 24. saw teeth; 25. handle; 3. drill bit; 31. guide needle part; 32. extension part; 4. first depth limiter; 41. first locking part; 5. second depth limiter; 51. second locking part; 6. pencil-type soft tissue opener guide rod; 7. guide wire. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the technical solution of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described in conjunction with the drawings of specific embodiments of the present invention. The same figure marks in the drawings represent the same parts. It should be noted that the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Unless otherwise defined, the technical or scientific terms used herein shall have the usual meanings understood by persons of ordinary skill in the field to which the invention belongs. The words "first", "second" and similar words used in the invention specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" and the like mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" and the like are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0036] like Figure 1 As shown, the present invention provides a depth-limiting percutaneous trephination device, comprising a sleeve 1, a trephination 2 and a drill bit 3. When the three are used in combination, double-precision real-time depth limiting can be achieved.

[0037] The sleeve 1 is provided with a first through hole 11 which penetrates in the axial direction.

[0038] The ring saw 2 is provided with a second through hole 21 which penetrates axially, and the ring saw 2 includes a saw barrel 22 and a limiting barrel 23 which are connected to each other along the axial direction. Saw teeth 24 are provided at the end of the saw barrel 22 which is away from the limiting barrel 23. The saw barrel 22 of the ring saw 2 can be sleeved in the first through hole 11 of the sleeve 1, and the outer diameter of the limiting barrel 23 is larger than the inner diameter of the first through hole 11 of the sleeve 1.

[0039] The drill bit 3 comprises a needle guide portion 31 and an extension portion 32 connected to each other along the axial direction. The outer diameter of the needle guide portion 31 is smaller than the outer diameter of the extension portion 32 . The extension portion 32 can be sleeved in the second through hole 21 of the ring saw 2 .

[0040] A first depth-limiting member 4 is provided on the saw barrel 22 of the ring saw 2, and the first depth-limiting member 4 is movably positioned along the axial direction of the saw barrel 22; a second depth-limiting member 5 is provided on the extension portion 32 of the drill bit 3, and the second depth-limiting member 5 is movably positioned along the axial direction of the extension portion 32. Preferably, the outer diameter of the second depth-limiting member 5 is greater than the inner diameter of the first through hole 11 of the sleeve 1. When the ring saw 2 is sleeved in the sleeve 1 and the drill bit 3 is sleeved in the ring saw 2, the first depth-limiting member 4 is located between the sleeve 1 and the limiting cylinder 23 of the ring saw 2, and the second depth-limiting member 5 is located on the upper side of the ring saw 2.

[0041] The ring saw 2, the drill bit 3, and the sleeve 1 of the present invention can be used in combination, the ring saw 2 and the sleeve 1 can be used in combination, and the drill bit 3 and the sleeve 1 can be used in combination. The specific use method is as follows:

[0042] (1) The first use mode is: the ring saw 2 is set in the first through hole 11 of the sleeve 1 for use, such as Figure 2 As shown, the first depth limiter 4 is located between the sleeve 1 and the limiting cylinder 23 of the ring saw 2. The sleeve 1 is used to open and protect the soft tissue. The position of the first depth limiter 4 at the saw cylinder 22 of the ring saw 2 is adjusted, and the ring saw 2 is rotated to saw the bone block. When the first depth limiter 4 contacts the sleeve 1, the ring saw 2 is locked and can no longer saw downward. Repeat the above steps of adjusting the first depth limiter 4, sawing the bone block, and locking the ring saw 2 until the target position is reached or the bone block is ground through.

[0043] (2) The second use mode is: the drill bit 3 is set in the first through hole 11 of the sleeve 1 for use, such as Figure 3 As shown, the second depth limiter 5 is located on the upper side of the sleeve 1, and the sleeve 1 is used to open and protect the soft tissue. The position of the second depth limiter 5 on the extension portion 32 of the drill bit 3 is adjusted so that the drill bit 3 is inserted into or drilled into the bone block. When the second depth limiter 5 contacts the sleeve 1, the drill bit 3 is locked and cannot go deeper. Repeat the above steps of adjusting the second depth limiter 5, inserting the drill bit 3 into or drilling into the bone block, and locking the drill bit 3 until the drill bit 3 penetrates into the target position.

[0044] (3) The third use mode is: the ring saw 2 is sleeved in the first through hole 11 of the sleeve 1, and the drill bit 3 is sleeved in the second through hole 21 of the ring saw 2. Figure 4As shown, at this time, the first depth limiting member 4 is located between the sleeve 1 and the limiting cylinder 23 of the ring saw 2 , the lower end surface of the ring saw 2 is located in the sleeve 1 , and the second depth limiting member 5 is located on the upper side of the ring saw 2 . The sleeve 1 is used to open and protect soft tissue. The position of the second depth limit piece 5 on the extension part 32 of the drill bit 3 is adjusted, and the guide needle part 31 of the drill bit 3 drills into the bone block. When the second depth limit piece 5 contacts the sleeve 1, the drill bit 3 is locked, and the C-arm machine perspective can be used to confirm that the needle tip of the guide needle part 31 is in the target safe position; then adjust the position of the first depth limit piece 4 on the saw tube 22 of the ring saw 2, rotate the ring saw 2 to ring saw the bone block, and when the first depth limit piece 4 contacts the sleeve 1, the ring saw 2 is locked and can no longer saw downward; according to actual conditions, repeat the above steps of adjusting the second depth limit piece 5, the guide needle part 31 of the drill bit 3 drilling into the bone block, the drill bit 3 locking, adjusting the first depth limit piece 4, rotating the ring saw 2 to ring saw the bone block, and the ring saw 2 locking, until the ring saw 2 reaches the target position or grinds through the bone block. When it is necessary to grind through the bone block, the drill bit 3 may not grind through the bone block. After the ring saw 2 grinds through the bone block, the drill bit 3 is still nailed to the bone block grinded through by the ring saw 2. When the ring saw 2 rotates, the drill bit 3 will rotate with the bone block, and the bone block will rotate together, indicating that the bone block is ground through and can be taken out.

[0045] The present invention sets a relatively suspended and lockable drill bit 3 with limited depth, combined with an adjustable depth-limiting ring saw 2, which is efficient and safe. The ring saw 2 and the drill bit 3 are both limited in depth and adjustable, detachable, and can be assembled and adjusted at any time. They can be used separately and can be used in combination. The present invention sets the front end (extending into one end of the bone block) without locking, and the rear end can be adjusted and locked, locked when equal length, and released when unequal, and then adjust the unequal distances, then ring saw 2, and then adjust until the ring saw 2 is completely penetrated. When there is no equidistant, the drill bit 3 rotates together with the ring saw 2 to indicate that the bone block has been ground through. When the safety requirements are high, it is also possible to confirm that the drill bit 3 is in a safe position through perspective, with the drill bit 3 tip as a reference, preliminarily measure the distance from the target position, adjust the corresponding position of the ring saw 2, and operate the ring saw 2. When the corresponding position is reached, it can stop, that is, the ring saw 2 operation is completed; or increase the appropriate safety distance and continue to ring saw 2 until it is sawed through (that is, the drill bit stops immediately when it starts to rotate with the ring saw).

[0046] The device can greatly improve the safety and efficiency of ring saws, and can quickly and easily complete the operations of many high-precision ring saws, greatly improving the safety and efficiency of such operations.

[0047] In one embodiment, as shown in the attached Figure 5 As shown, a depth-limited percutaneous trepanation device of the present invention further includes a pencil-type soft tissue opener guide rod 6 that can be sleeved in the first through hole 11 of the sleeve 1, and the pencil-type soft tissue opener guide rod 6 is provided with a third through hole that penetrates along its axial direction, and a guide wire 7 is movably arranged in the third through hole. The pencil-type soft tissue opener guide rod 6 is used to expand soft tissue and reduce soft tissue damage and bleeding.

[0048] In one embodiment, the first depth limiting member 4 is threadedly connected to the saw barrel 22 of the ring saw 2; or the first depth limiting member 4 is slidably connected to the saw barrel 22 of the ring saw 2, and a first locking member 41 is provided on the first depth limiting member 4 to fasten it to the saw barrel 22.

[0049] The second depth limiting member 5 is threadedly connected to the extension portion 32 of the drill bit 3 ; or the second depth limiting member 5 is slidably connected to the extension portion 32 of the drill bit 3 , and a second locking member 51 is provided on the second depth limiting member 5 to fasten it to the extension portion 32 .

[0050] The saw barrel 22 of the ring saw 2 and the extension portion 32 of the drill bit 3 are both provided with scale marks extending in the axial direction.

[0051] In one embodiment, the scale graduations on the saw barrel 22 of the ring saw 2 are marked from bottom to top, and when the ring saw 2 is flush with the bottom end of the sleeve 1, the position corresponding to the top end of the sleeve 1 is the "0" point of the scale graduations on the saw barrel 22; the scale graduations on the extension portion 32 of the drill bit 3 are arranged in two groups, and are marked from bottom to top, and when the drill bit 3 is flush with the bottom end of the sleeve 1, the position corresponding to the top end of the sleeve 1 is the "0" point of the first group of scale graduations on the extension portion 32; when the drill bit 3 is flush with the bottom end of the ring saw 2, the position corresponding to the top end of the ring saw 2 is the "0" point of the second group of scale graduations on the extension portion 32.

[0052] In this embodiment, when the sleeve 1 is used in conjunction with the drill bit 3, the first set of scale marks on the extension portion 32 is convenient for being directly used for depth marking. When the sleeve 1, the ring saw 2, and the drill bit 3 are used in conjunction with each other, the second set of scale marks on the extension portion 32 is convenient for being directly used for depth marking, and at this time, when the reading of the first depth limiter 4 on the saw barrel 22 of the ring saw 2 is consistent with the reading of the second depth limiter 5 on the extension portion 32 of the drill bit 3, it means that the distances that the ring saw 2 and the drill bit 3 can penetrate into the bone block are consistent, thereby facilitating the adjustment of the positions of the first depth limiter 4 and the second depth limiter 5, so as to achieve the same or different drilling distances of the ring saw 2 and the drill bit 3.

[0053] In one embodiment, the sleeve 1 is provided with a scale extending in the axial direction.

[0054] In one embodiment, a handle 12 is provided at the top of the sleeve 1 for easy taking and operation.

[0055] In one embodiment, a handle 25 is provided at the top end of the limiting tube 23 of the ring saw 2. The handle 25 may be a "T-shaped" structure, which is convenient for operating the ring saw with force.

[0056] In one embodiment, an anti-slip structure is provided on the handle 25 and the handle 12. The anti-slip structure may be a surface of the handle 25 and the handle 12 set to a rough surface design to achieve the purpose of anti-slip.

[0057] In one embodiment, the length of the sleeve 1 is 13 cm and the outer diameter is 12 mm, the inner diameter of the first through hole 11 of the sleeve 1 is greater than or equal to 10 mm; the length of the saw barrel 22 of the ring saw 2 is 20 cm and the outer diameter is 10 mm; the length of the limiting barrel 23 of the ring saw 2 is 5 cm and the outer diameter is 15 mm; the inner diameter of the second through hole 21 of the ring saw 2 is greater than or equal to 3 mm; the guide needle part 31 of the drill bit 3 is a Kirschner wire structure with a diameter of 1.5 mm and a length of 7 cm, which is the same as the longest distance that the ring saw 2 enters the bone; the extension part 32 of the drill bit 3 is 33 cm long and has an outer diameter of 3 mm.

[0058] In one embodiment, the length of the pencil-type soft tissue opener guide rod is 25 cm, the outer diameter is 10 mm, the outer diameter of the tip is 3 mm, and the inner diameter of the third through hole is 1 mm; the length of the guide wire is 40 cm and the outer diameter is 0.9 mm.

[0059] The device of the present invention can be applied to various requirements for precise ring sawing of bone tissue, especially deep spinal bone tissue, and can provide a precise and safe device for decompression, expansion and shaping, and removal of stenosis and other operations; it can meet the needs of being able to remove a large amount of bone while being percutaneously minimally invasive; the use of the device of the present invention can minimize the radiation exposure; the sleeve 1, the ring saw 2, and the drill bit 3 can all be depth-limited and adjustable, can be disassembled, can be assembled at any time, can be used separately or in combination; the sleeve 1, the ring saw 2, and the drill bit 3 can be precisely coordinated to achieve dual real-time dynamic precise depth limiting, and can be used as a reference to each other, thereby simplifying the operation to the extreme, improving efficiency, and improving the safety of the operation.

[0060] The present invention also provides a method for using a depth-limited percutaneous trephine device, comprising the following steps:

[0061] (1) The sleeve 1 is used to expand the soft tissue, the ring saw 2 is sleeved in the sleeve 1, and the drill bit 3 is sleeved in the ring saw 2;

[0062] (2) adjusting the position of the second depth stopper 5 on the extension portion 32 of the drill bit 3 so that the guide needle portion 31 of the drill bit 3 drills into the bone block, and when the second depth stopper 5 contacts the trephine 2, the drill bit 3 is locked;

[0063] (3) adjusting the position of the first depth limiter 4 on the saw barrel 22 of the ring saw 2, rotating the ring saw 2 to ring saw the bone block, and when the first depth limiter 4 contacts the sleeve 1, the ring saw 2 is locked;

[0064] (4) Repeat steps (2) and (3) several times until the drill bit 3 reaches the target position and the ring saw 2 grinds through the bone block.

[0065] Before step (1), the method may further include: placing the guide wire 7 in the pencil-type soft tissue opener guide rod 6, sleeved in the sleeve 1 to expand the soft tissue, and leaving the sleeve 1 at the soft tissue opening to expand and protect the soft tissue.

[0066] In the method for using the depth-limiting percutaneous ring saw device of the present invention, step (2) and step (3) can also be performed by first adjusting the position of the second depth-limiting member 5 on the extension portion 32 of the drill bit 3 and the position of the first depth-limiting member 4 on the saw barrel 22 of the ring saw 2, and then sequentially operating the drill bit 3 until the drill bit 3 is locked and rotating the ring saw 2 until the ring saw 2 is locked.

[0067] In step (2) and step (3), the position adjustment of the second depth limiter 5 and the first depth limiter 4 can make the distance that the ring saw 2 and the drill bit 3 can penetrate into the bone block consistent or inconsistent. Preferably, the second depth limiter 5 and the first depth limiter 4 are adjusted so that the distance that the ring saw 2 and the drill bit 3 can penetrate into the bone block is consistent. First, the guide needle part 31 is used to drill into the bone block. When the second depth limiter 5 contacts the sleeve 1, the drill bit 3 is locked and cannot penetrate further. The C-arm machine perspective can be used to confirm that the needle tip of the guide needle part 31 is in a safe position, and then the ring saw 2 is rotated to ring saw the bone block until the ring saw is automatically locked and cannot be sawed downward, and the above steps are repeated. If necessary, the C-arm machine perspective can be used to see whether the target is completely reached. If the target is reached, the ring saw is stopped. If it is not reached, the needle tip of the guide needle part 31 of the drill bit 3 is used as a reference to preliminarily measure the distance from the target position, adjust the position of the first depth limiter 4, and then perform the ring saw operation. When the target position is reached, it can be stopped, that is, the ring saw operation is completed. When it is observed through C-arm fluoroscopy that the bone block is about to be penetrated, only the first depth limiter 4 on the ring saw 2 can be adjusted to allow the ring saw 2 to increase the appropriate safety distance and continue to saw through the bone block (i.e., the drill bit 3 stops immediately when it starts to rotate with the ring saw 2). At this time, the rotation and downward pressure should be stopped immediately, and the position should be maintained or pulled upward. Or when the bone block is about to be ground through, let the assistant clamp the tail of the extension part 32 of the drill bit 3, and immediately stabilize and pull the drill bit 3 upward when it is ground through (i.e., when the drill bit 3 and the ring saw 2 rotate together), to prevent the drill bit 3 from sinking together with the ring saw 2 to damage or compress the tissue under the bone surface. Therefore, the use method of the depth-limited percutaneous ring saw device of the present invention can achieve the purpose of safely and accurately sawing the target bone block, reduce the steps and links of repeated perspective confirmation, and make the operation quick and safe.

[0068] Those skilled in the art should understand that the above-mentioned specific embodiments are merely examples and not limitations, and various modifications, combinations, partial combinations and replacements may be made to the embodiments of the present invention according to design requirements and other factors. As long as they are within the scope of the attached claims or their equivalents, they are within the scope of rights to be protected by the present invention.

Claims

1. A depth-limited percutaneous trephine device, characterized in that: include: A sleeve, wherein a first through hole is provided on the sleeve and penetrates the sleeve in the axial direction; A ring saw, wherein a second through hole is provided on the ring saw and passes through the ring saw in the axial direction, the ring saw comprises a saw barrel and a stop barrel connected to each other in the axial direction, saw teeth are provided at the end of the saw barrel facing away from the stop barrel, the saw barrel of the ring saw can be sleeved in the first through hole of the sleeve, and the outer diameter of the stop barrel is larger than the inner diameter of the first through hole of the sleeve; A drill bit, the drill bit comprising a guide needle portion and an extension portion connected to each other along the axial direction, the outer diameter of the guide needle portion is smaller than the outer diameter of the extension portion, and the extension portion can be sleeved in the second through hole of the trephine; A first depth limiter is arranged on the saw barrel of the ring saw, and the first depth limiter is positioned along the axial direction of the saw barrel; a second depth limiter is arranged on the extension part of the drill bit, and the second depth limiter is positioned along the axial direction of the extension part; when the ring saw is sleeved in the sleeve and the drill bit is sleeved in the ring saw, the first depth limiter is located between the sleeve and the limiting cylinder of the ring saw, and the second depth limiter is located on the upper side of the ring saw.

2. A depth-limited percutaneous trephine device according to claim 1, characterized in that: It also includes a pencil-type soft tissue opener guide rod that can be sleeved in the first through hole of the sleeve. The pencil-type soft tissue opener guide rod is provided with a third through hole that penetrates along its axial direction. A guide wire is movably arranged in the third through hole.

3. A depth-limited percutaneous trephine device according to claim 1, characterized in that: The first depth limiting member is threadedly connected to the saw barrel of the ring saw; or the first depth limiting member is slidably connected to the saw barrel of the ring saw, and a first locking member is provided on the first depth limiting member to fasten it to the saw barrel.

4. A depth-limited percutaneous trephine device according to claim 1, characterized in that: The second depth limiter is threadedly connected to the extension portion of the drill bit; or the second depth limiter is slidably connected to the extension portion of the drill bit, and a second locking member is provided on the second depth limiter to fasten it to the extension portion.

5. A depth-limited percutaneous trephine device according to claim 1, characterized in that: The saw barrel of the ring saw and the extension part of the drill bit are both provided with scale scales extending in the axial direction.

6. A depth-limited percutaneous trephine device according to claim 5, characterized in that: The scales on the saw barrel and the extension are marked from bottom to top. When the ring saw is flush with the bottom end of the sleeve, the corresponding position of the top end of the sleeve is the "0" point of the scale on the saw barrel; the scale on the extension is arranged in two groups. When the drill bit is flush with the bottom end of the sleeve, the corresponding position of the top end of the sleeve is the "0" point of the first group of scales on the extension; when the drill bit is flush with the bottom end of the ring saw, the corresponding position of the top end of the ring saw is the "0" point of the second group of scales on the extension.

7. A depth-limited percutaneous trephine device according to claim 1, characterized in that: A handle is arranged at the top end of the sleeve, and a grip is arranged at the top end of the limiting cylinder of the ring saw.

8. The depth-limited percutaneous trephine device according to claim 1, characterized in that: The length of the sleeve is 13 cm, the outer diameter is 12 mm, and the inner diameter of the first through hole of the sleeve is greater than or equal to 10 mm; The saw barrel of the ring saw has a length of 20 cm and an outer diameter of 10 mm; the limiter barrel of the ring saw has a length of 5 cm and an outer diameter of 15 mm; the inner diameter of the second through hole of the ring saw is greater than or equal to 3 mm; The guide needle portion of the drill bit is a Kirschner wire structure with a diameter of 1.5 mm and a length of 7 cm; the extension portion of the drill bit is 33 cm long and has an outer diameter of 3 mm.

9. A depth-limited percutaneous trephine device according to claim 2, characterized in that: The pencil-type soft tissue opener guide rod has a length of 25 cm, an outer diameter of 10 mm, an outer diameter of the tip of 3 mm, and an inner diameter of the third through hole of 1 mm; The guide wire has a length of 40 cm and an outer diameter of 0.9 mm.

10. A method for using a depth-limited percutaneous trephine device according to any one of claims 1 to 9, characterized in that: The following steps are involved: (1) The sleeve is used to expand the soft tissue, the ring saw is placed in the sleeve, and the drill bit is placed in the ring saw; (2) adjusting the position of the second depth stopper at the extension portion of the drill bit so that the guide needle portion of the drill bit drills into the bone block, and when the second depth stopper contacts the ring saw, the drill bit is locked; (3) adjusting the position of the first depth limiter on the saw barrel of the ring saw, rotating the ring saw to ring saw the bone block, and when the first depth limiter contacts the sleeve, the ring saw is locked; (4) Repeat steps (2) and (3) several times until the drill bit reaches the target position and the ring saw penetrates the bone block.

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