Depth-limiting percutaneous trephine device

Abstract

The utility model discloses a depth-limiting percutaneous trephine device which 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. According to the trephine, the sleeve, the trephine and the drill bit are used in cooperation, double precise depth limiting can be achieved, and the safety and the efficiency of the trephine are greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of surgical instrument technology, specifically a depth-limited percutaneous circumferential saw device. Background Technology

[0002] In minimally invasive percutaneous trephine sawing procedures such as bone harvesting, osteophyte removal and decompression, facet joint repair, and anterior cervical decompression, safety is paramount because direct visualization is not possible. The primary safety concern stems from the inability to precisely limit depth in real time. Relying solely on touch or having only partial depth-limiting functionality cannot guarantee complete precision, thus compromising safety. Currently, all percutaneous trephine saws lack dedicated depth-limiting capabilities or only offer partial segmented depth-limiting; no trephine saw device provides truly real-time, precise depth limiting. Utility Model Content

[0003] To address the shortcomings of existing technologies, this invention provides a depth-limited percutaneous circumcision saw device that can achieve real-time depth limitation and dual precision depth limitation, greatly improving the safety and efficiency of circumcision. It can quickly and easily complete many high-precision circumcision operations, significantly improving the safety and efficiency of this type of surgery and solving previously intractable clinical problems that percutaneous minimally invasive surgery could not address.

[0004] To achieve the above objectives, this utility model employs the following technical solution:

[0005] A depth-limited percutaneous trephine saw device, comprising:

[0006] A sleeve, wherein a first through hole is provided on the sleeve extending axially;

[0007] A ring saw, wherein a second through hole is provided on the ring saw, the ring saw includes a saw cylinder and a limiting cylinder connected to each other along the axial direction, the end of the saw cylinder away from the limiting cylinder is provided with saw teeth, the saw cylinder of the ring saw can be sleeved in the first through hole of the sleeve, and the outer diameter of the limiting cylinder is larger than the inner diameter of the first through hole of the sleeve.

[0008] A drill bit, comprising a guide pin portion and an extension portion connected to each other along an axial direction, wherein the outer diameter of the guide pin portion is smaller than the outer diameter of the extension portion, and the extension portion can be fitted into the second through hole of a ring saw.

[0009] The ring saw is provided with a first depth limiting member on the saw barrel, and the first depth limiting member is movably positioned along the axial direction of the saw barrel; the drill bit is provided with a second depth limiting member on the extension part, and the second depth limiting member is movably 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 limiting member is located between the sleeve and the limiting cylinder of the ring saw, and the second depth limiting member is located on the upper side of the ring saw.

[0010] A depth-limited percutaneous circumferential saw device further includes a pencil-type soft tissue opener guide rod that can be sleeved in a first through hole of a sleeve. The pencil-type soft tissue opener guide rod has a third through hole that extends along its axial direction, and a guide wire is movably disposed 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 limiting member is threadedly connected to the extension of the drill bit; or the second depth limiting member is slidably connected to the extension of the drill bit, and a second locking member is provided on the second depth limiting member to fasten it to the extension.

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

[0014] The scale markings on the saw barrel and extension are all marked from bottom to top. When the bottom end of the ring saw is flush with the bottom end of the sleeve, the top end of the sleeve corresponds to the "0" point on the scale markings on the saw barrel. The scale markings on the extension are set in two sets. When the drill bit is flush with the bottom end of the sleeve, the top end of the sleeve corresponds to the "0" point on the first set of scale markings on the extension. When the drill bit is flush with the bottom end of the ring saw, the top end of the ring saw corresponds to the "0" point on the second set of scale markings on the extension.

[0015] The top of the sleeve is provided with a handle, and the top of the limiting sleeve of the ring saw is provided with a handle.

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

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

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

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

[0020] The length of the guide rod of the pencil-type soft tissue opener 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.

[0021] The guidewire is 40 cm long and has an outer diameter of 0.9 mm.

[0022] A method of using a depth-limited percutaneous trephine saw includes the following steps:

[0023] (1) The sleeve opens up the soft tissue, the ring saw is sleeved in the sleeve, and the drill bit is sleeved in the ring saw;

[0024] (2) Adjust the position of the second depth limiting part in the extension of the drill bit so that the guide pin of the drill bit drills into the bone block. When the second depth limiting part touches the ring saw, the drill bit locks up.

[0025] (3) Adjust the position of the first depth limiting piece on the saw barrel of the ring saw, rotate the ring saw to ring saw the bone block, and lock the ring saw when the first depth limiting piece touches the sleeve;

[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 existing technologies, the advantages of this utility model are as follows: This utility model's depth-limiting percutaneous circumferential saw device can be used in conjunction with a sleeve and a circumferential saw, or with a sleeve and a drill bit, or with a sleeve, circumferential saw, and drill bit all used together, thus expanding its applicability. Furthermore, when the sleeve, circumferential saw, and drill bit are used together, real-time dual precision depth limitation can be achieved, greatly improving the safety and efficiency of the circumferential saw. It can quickly and easily complete many high-precision circumferential saw operations, greatly improving the safety and efficiency of this type of surgery and solving previously intractable clinical problems that percutaneous minimally invasive surgery could not address. Attached Figure Description

[0028] Appendix Figure 1 This is a schematic diagram of the structure of this utility model.

[0029] Appendix Figure 2 This is a schematic diagram of the structure of the ring saw and the sleeve used together in this utility model.

[0030] Appendix Figure 3 This is a schematic diagram of the structure of the drill bit and sleeve used in conjunction with this utility model.

[0031] Appendix Figure 4 This is a schematic diagram of the structure of the drill bit, ring saw, and sleeve used in conjunction with this utility model.

[0032] Appendix Figure 5 This is a schematic diagram of the structure of the pencil-type soft tissue opener using the guide rod and sleeve in conjunction.

[0033] The following are the reference numerals in the attached diagram: 1. Sleeve; 11. First through hole; 12. Handle; 2. Ring saw; 21. Second through hole; 22. Saw barrel; 23. Limiting sleeve; 24. Saw teeth; 25. Handle; 3. Drill bit; 31. Guide pin part; 32. Extension part; 4. First depth limiting element; 41. First locking element; 5. Second depth limiting element; 51. Second locking element; 6. Pencil-type soft tissue opener guide rod; 7. Guide wire. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0035] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar words used in this utility model specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only 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, this utility model provides a depth-limiting percutaneous ring saw device, including a sleeve 1, a ring saw 2, and a drill bit 3. When the three are used together, they can achieve dual precise real-time depth limiting.

[0037] The sleeve 1 is provided with a first through hole 11 that extends along the axial direction.

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

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

[0040] The ring saw 2 has a first depth limiting member 4 on its saw barrel 22, which is movably positioned along the axial direction of the saw barrel 22. The drill bit 3 has a second depth limiting member 5 on its extension 32, which is movably positioned along the axial direction of the extension 32. Preferably, the outer diameter of the second depth limiting member 5 is larger 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 inside 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, drill bit 3, and sleeve 1 of this utility model can be used together, or the ring saw 2 can be used in combination with the sleeve 1, or the drill bit 3 can be used in combination with the sleeve 1. The specific usage methods are as follows:

[0042] (1) The first method of use is: the ring saw 2 is fitted into the first through hole 11 of the sleeve 1, such as Figure 2 As shown, the first depth limiting member 4 is located between the sleeve 1 and the limiting sleeve 23 of the ring saw 2. The sleeve 1 is used to open and protect soft tissue. Adjust the position of the first depth limiting member 4 at the saw barrel 22 of the ring saw 2, rotate the ring saw 2 to saw the bone block. When the first depth limiting member 4 touches the sleeve 1, the ring saw 2 locks and cannot saw downwards anymore. Repeat the above steps of adjusting the first depth limiting member 4, sawing the bone block, and locking the ring saw 2 until the target position is reached or the bone block is worn through.

[0043] (2) The second method of use is: the drill bit 3 is fitted inside the first through hole 11 of the sleeve 1, such as... Figure 3 As shown, the second depth limiting member 5 is located on the upper side of the sleeve 1. The sleeve 1 is used to open and protect the soft tissue. Adjust the position of the second depth limiting member 5 at the extension 32 of the drill bit 3 so that the drill bit 3 can be inserted into or drilled into the bone block. When the second depth limiting member 5 touches the sleeve 1, the drill bit 3 is locked and cannot go deeper. Repeat the above steps of adjusting the second depth limiting member 5, inserting or drilling the drill bit 3 into the bone block, and locking the drill bit 3 until the drill bit 3 reaches the target position.

[0044] (3) The third method of use is as follows: the ring saw 2 is fitted into the first through hole 11 of the sleeve 1, and the drill bit 3 is fitted into 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 face of the ring saw 2 is located inside the sleeve 1, and the second depth limiting member 5 is located on the upper side of the ring saw 2. Sleeve 1 is used to spread and protect soft tissue. Adjust the position of the second depth limiting member 5 on the extension 32 of the drill bit 3. The guide pin 31 of the drill bit 3 drills into the bone block. When the second depth limiting member 5 touches the sleeve 1, the drill bit 3 locks. A C-arm fluoroscopy can be used to confirm that the tip of the guide pin 31 is in the target safe position. Then adjust the position of the first depth limiting member 4 on the saw barrel 22 of the ring saw 2. Rotate the ring saw 2 to ring saw the bone block. When the first depth limiting member 4 touches the sleeve 1, the ring saw 2 locks and cannot saw downwards. According to the actual situation, repeat the above steps of adjusting the second depth limiting member 5, the guide pin 31 of the drill bit 3 drilling into the bone block, the drill bit 3 locking, adjusting the first depth limiting member 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, drill bit 3 may not grind through the bone block. After the ring saw 2 grinds through the bone block, drill bit 3 is still attached to the bone block that the ring saw 2 has ground through. When the ring saw 2 rotates, drill bit 3 will rotate with the bone block. The bone block will rotate along with it, indicating that the bone block has been ground through and can be removed.

[0045] This invention features a drill bit 3 that can be suspended and locked to limit depth, combined with an adjustable depth-limiting ring saw 2. It is highly efficient and safe. Both the ring saw 2 and the drill bit 3 are depth-limiting and adjustable, detachable, and can be assembled and adjusted at any time. They can be used separately or together. The front end (the end that extends into the bone block) is not locked, while the rear end is adjustable and locked. It locks when the length is equal and releases when it is unequal, allowing for further adjustment of the distance. The ring saw 2 is then cut again, and the adjustment continues until the ring saw 2 completely penetrates the bone. When the distance is not equal, the drill bit 3 and the ring saw 2 rotate together, indicating that the bone block has been completely worn through. For higher safety requirements, a fluoroscopic view can be used to confirm that the drill bit 3 is in a safe position. Using the tip of the drill bit 3 as a reference, the distance to the target position is initially measured, and the ring saw 2 is adjusted accordingly. The ring saw 2 operation is then performed, stopping when the target position is reached; alternatively, an appropriate safety distance can be added to continue ring sawing 2 until it penetrates (i.e., the drill bit stops immediately when it begins to rotate with the ring saw).

[0046] This device can greatly improve the safety and efficiency of trephine cutting. It can quickly and easily complete many high-precision trephine cutting operations, greatly improving the safety and efficiency of such surgeries.

[0047] In one embodiment, as shown in the appendix Figure 5 As shown, this utility model discloses a depth-limited percutaneous circumferential saw device, which further includes a pencil-type soft tissue opener guide rod 6 that can be fitted into the first through hole 11 of the sleeve 1. The pencil-type soft tissue opener guide rod 6 has a third through hole extending along its axial direction, and a guide wire 7 is movably disposed 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 32 of the drill bit 3 are both provided with scale markings extending along the axial direction.

[0051] In one embodiment, the scale markings on the saw barrel 22 of the ring saw 2 are arranged from bottom to top, and when the ring saw 2 is flush with the bottom end of the sleeve 1, the top end of the sleeve 1 corresponds to the "0" point on the scale markings on the saw barrel 22; the scale markings on the extension 32 of the drill bit 3 are set in two sets, and are arranged from bottom to top. When the drill bit 3 is flush with the bottom end of the sleeve 1, the top end of the sleeve 1 corresponds to the "0" point on the first set of scale markings on the extension 32; when the drill bit 3 is flush with the bottom end of the ring saw 2, the top end of the ring saw 2 corresponds to the "0" point on the second set of scale markings on the extension 32.

[0052] In this embodiment, when the sleeve 1 is used in conjunction with the drill bit 3, the first set of scale markings on the extension 32 can be directly used for depth limit marking. When the sleeve 1, the ring saw 2, and the drill bit 3 are used in conjunction, the second set of scale markings on the extension 32 can be directly used for depth limit marking. 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 32 of the drill bit 3, it indicates that the ring saw 2 and the drill bit 3 can penetrate the bone block at the same distance, thereby facilitating the adjustment of the positions of the first depth limiter 4 and the second depth limiter 5 to achieve the adjustment of the drilling distance of the ring saw 2 and the drill bit 3 to be the same or different.

[0053] In one embodiment, the sleeve 1 is provided with a scale that extends axially.

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

[0055] In one embodiment, a handle 25 is provided at the top of the limiting cylinder 23 of the ring saw 2. The handle 25 can be a "T-shaped" structure to facilitate the ring saw operation.

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

[0057] In one embodiment, the sleeve 1 is 13 cm long and has an outer diameter of 12 mm; the first through hole 11 of the sleeve 1 has an inner diameter greater than or equal to 10 mm; the saw barrel 22 of the ring saw 2 is 20 cm long and has an outer diameter of 10 mm; the limiting cylinder 23 of the ring saw 2 is 5 cm long and has an outer diameter of 15 mm; the second through hole 21 of the ring saw 2 has an inner diameter greater than or equal to 3 mm; the guide pin 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 the ring saw 2 can penetrate into the bone; the extension 32 of the drill bit 3 is 33 cm long and has an outer diameter of 3 mm.

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

[0059] This utility model device is suitable for various precise trephine cutting operations on bone tissue, especially deep vertebral bone tissue, providing a precise and safe device for decompression, widening and shaping, and removal of stenosis; it meets the need for large-volume bone harvesting with minimally invasive percutaneous surgery; the use of this utility model device can minimize radiation exposure; the sleeve 1, trephine 2, and drill bit 3 are all depth-adjustable, detachable, and can be assembled at any time, used separately or in combination; the sleeve 1, trephine 2, and drill bit 3 can work precisely together to achieve dual real-time dynamic precision depth control, and can be used as references for each other, greatly simplifying the operation, improving efficiency, and enhancing surgical safety.

[0060] This utility model also provides a method for using a depth-limited percutaneous circumferential saw device, including the following steps:

[0061] (1) Sleeve 1 opens up the soft tissue, ring saw 2 is sleeved in sleeve 1, and drill bit 3 is sleeved in ring saw 2;

[0062] (2) Adjust the position of the second depth limiting member 5 in the extension 32 of the drill bit 3 so that the guide pin 31 of the drill bit 3 drills into the bone block. When the second depth limiting member 5 touches the ring saw 2, the drill bit 3 locks.

[0063] (3) Adjust the position of the first depth limiting piece 4 on the saw barrel 22 of the ring saw 2, rotate the ring saw 2 to ring saw the bone block, and when the first depth limiting piece 4 touches 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 procedure may include: placing the guide wire 7 inside the pencil-type soft tissue opener guide rod 6, and sleeve the pencil-type soft tissue opener guide rod 6 inside the sleeve 1 to expand the soft tissue, and leaving the sleeve 1 at the soft tissue opening to open and protect the soft tissue.

[0066] In the method of using the depth-limiting percutaneous ring saw device of this utility model, steps (2) and (3) can also be performed by first adjusting the position of the second depth-limiting member 5 on the extension 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 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 steps (2) and (3), adjusting the positions of the second depth limiting member 5 and the first depth limiting member 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, adjusting the second depth limiting member 5 and the first depth limiting member 4 so that the distance that the ring saw 2 and the drill bit 3 can penetrate into the bone block is consistent, firstly, the guide pin 31 is used to drill into the bone block. When the second depth limiting member 5 touches the sleeve 1, the drill bit 3 locks and cannot penetrate further. A C-arm fluoroscopy can be used to confirm that the tip of the guide pin 31 is in a safe position. Then, the ring saw 2 is rotated to circumferentially saw the bone block until the ring saw automatically locks and cannot saw downwards. The above steps are repeated. If necessary, a C-arm fluoroscopy can be used to check whether the target has been completely reached. If the target has been reached, the ring sawing is stopped. If it has not been reached, the tip of the guide pin 31 of the drill bit 3 is used as a reference to initially measure the distance from the target position. The position of the first depth limiting member 4 is adjusted, and the ring sawing operation is performed again. When the target position is reached, the ring sawing operation is stopped, thus completing the ring sawing operation. When fluoroscopy using a C-arm machine shows that the bone block is about to be penetrated, only the first depth limiter 4 on the percutaneous trephine saw 2 needs to be adjusted to increase the safe distance of the trephine saw 2 and continue trephining until the bone block is penetrated (i.e., stop immediately when the drill bit 3 starts rotating with the trephine saw 2). At this point, rotation and downward pressure should be stopped immediately, and the position maintained or pulled upward. Alternatively, when the bone block is about to be penetrated, an assistant can hold the tail of the extension 32 of the drill bit 3. When the bone block is penetrated (i.e., when both the drill bit 3 and the trephine saw 2 are rotating together), the drill bit 3 should be stabilized and pulled upward to prevent it from sinking down with the trephine saw 2 and damaging or compressing the tissue beneath the bone surface. Therefore, the method of using the depth-limited percutaneous trephine saw device of this invention can achieve the purpose of safely and accurately trephining the target bone block, reducing the steps and procedures of repeated fluoroscopic confirmation, and making the surgery quick and safe.

[0068] Those skilled in the art should understand that the specific embodiments described above are merely examples and not limitations. Various modifications, combinations, partial combinations, and substitutions can be made to the embodiments of this utility model according to design requirements and other factors, as long as they are within the scope of the appended claims or their equivalents, and thus fall within the scope of the rights to be protected by this utility model.

Claims

1. A depth limited percutaneous trephine device, characterised in that, It comprises: a sleeve, which is provided with a first through hole penetrating in the axial direction; a ring saw, which is provided with a second through hole penetrating in the axial direction, and comprises a saw cylinder and a limiting cylinder connected with each other in the axial direction, the end of the saw cylinder away from the limiting cylinder is provided with saw teeth, the saw cylinder of the ring saw can be sleeved in the first through hole of the sleeve, and the outer diameter of the limiting cylinder is greater than the inner diameter of the first through hole of the sleeve; a drill bit, which comprises a guide needle part and an extension part connected with each other in the axial direction, the outer diameter of the guide needle part is smaller than the outer diameter of the extension part, and the extension part can be sleeved in the second through hole of the ring saw. The saw cylinder of the ring saw is provided with a first depth limiter, which is movably positioned in the axial direction of the saw cylinder; the extension part of the drill bit is provided with a second depth limiter, which is movably positioned in 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 limiting trephine device according to claim 1, wherein, It also comprises a pencil type soft tissue opening device guide rod, which can be sleeved in the first through hole of the sleeve, and is provided with a third through hole penetrating in the axial direction of the guide rod, and a guide wire is movably arranged in the third through hole.

3. The limited-depth trephine device of claim 1, wherein: The first depth limiter is threadedly connected with the saw cylinder of the ring saw, or is slidably connected with the saw cylinder of the ring saw, and the first depth limiter is provided with a first locking part for fastening the first depth limiter on the saw cylinder.

4. The limited-depth trephine device of claim 1, wherein: The second depth limiter is threadedly connected with the extension part of the drill bit, or is slidably connected with the extension part of the drill bit, and the second depth limiter is provided with a second locking part for fastening the second depth limiter on the extension part.

5. The limited-depth trephine device of claim 1, wherein: The saw cylinder of the ring saw and the extension part of the drill bit are both provided with a scale mark extending in the axial direction.

6. A depth limiting trephine device according to claim 5, wherein, The scale marks on the saw cylinder and the extension part are both marked from bottom to top, when the ring saw is flush with the bottom end of the sleeve, the position corresponding to the top end of the sleeve is the "0" point of the scale mark on the saw cylinder; the scale mark on the extension part is provided in two groups, when the drill bit is flush with the bottom end of the sleeve, the position corresponding to the top end of the sleeve is the "0" point of the first group of scale marks on the extension part; when the drill bit is flush with the bottom end of the ring saw, the position corresponding to the top end of the ring saw is the "0" point of the second group of scale marks on the extension part.

7. The limited-depth trephine device of claim 1, wherein: The top end of the sleeve is provided with a handle, and the top end of the limiting cylinder of the ring saw is provided with a handle.

8. The depth limiting percutaneous ring saw device according to claim 1, wherein the length of the sleeve is 13 cm, and 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 length of the saw cylinder of the ring saw is 20 cm, and the outer diameter is 10 mm; the length of the limiting cylinder of the ring saw is 5 cm, and the outer diameter is 15 mm; and the inner diameter of the second through hole of the ring saw is greater than or equal to 3 mm; the guide needle part of the drill bit is a Kirschner wire structure with a diameter of 1.5 mm and a length of 7 cm; and the length of the extension part of the drill bit is 33 cm, and the outer diameter is 3 mm.

9. The depth limiting percutaneous ring saw device according to claim 2, wherein The pencil type soft tissue unclogger guide rod has a length of 25 cm, an outer diameter of 10 mm, a tip outer diameter of 3 mm, and the third through hole has an inner diameter of 1 mm; The guide wire has a length of 40 cm and an outer diameter of 0.9 mm.

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