Bone trimmer

Abstract

The present application relates to the field of oral medicine, and provides a bone trimmer, comprising: a main body, on which is provided an interface for an externally connected rotating power device; a bone trimming ring, which is sleeved on an end portion of one side of the main body to rotate coaxially with the main body, and the bone trimming ring is used to trim the bone surface; and a guide rod, which is coaxially arranged relative to the bone trimming ring and is used to guide and position the bone trimming ring. The bone trimmer provided by the embodiments of the present application has better safety and reliability.

Description

Technical Field

[0001] The present application relates to the field of oral medicine, and in particular to a bone trimmer. Background Art

[0002] As oral implant technology matures, more and more patients are using dental implants to repair missing teeth. During oral implantation, doctors need to use a drill that matches the patient's alveolar bone to prepare the hole and then implant the implant into the bone.

[0003] During drilling preparation, the drilling accuracy is usually around 0.5mm. When the alveolar bone height is insufficient, it is even more necessary to control the drilling depth to avoid damaging the nerves and blood vessels in the bone or bone perforation, which may lead to implant exposure and surgical failure.

[0004] There are many brands of implants on the market. Although the design concepts are different, all implants are standard cylindrical and require that the implants be completely buried in the bone when implanted. At the same time, only in a few cases is the patient's alveolar bone ideally flat. In most cases, the bone surface is uneven and undulating. For this reason, in order to obtain excellent drilling accuracy, it is usually necessary to flatten the alveolar bone first, which requires the use of a bone trimmer. The alveolar bone that has been trimmed to a flush level by a bone trimmer can provide a good reference point when preparing for drilling during implant surgery, allowing for faster preparation and avoiding repeated cutting of the drill bit in the alveolar bone, leading to bone necrosis, postoperative pain, and even implant detachment and other severe complications.

[0005] In the prior art, a ball drill or similar bone removal tool is usually used to trim the bone surface of the alveolar bone. However, since the ball drill rotates at high speed, it is easy to slip at the moment of contacting the bone surface. Once the high-speed rotating ball drill contacts the adjacent tissue, it will inevitably cause damage to the adjacent tissue. In addition, since it is easy to slip, it is difficult to control the trimming amount of the ball drill. Summary of the invention

[0006] In order to solve the above problems or at least partially solve the above technical problems, in one embodiment of the present application, a bone trimmer is provided, comprising:

[0007] A main body, on which an interface for connecting an external rotating power device is provided;

[0008] A bone trimming ring is sleeved on the end of one side of the main body to rotate coaxially with the main body, and is used to trim the bone surface;

[0009] The guide rod is coaxially arranged relative to the bone trimming ring and is used for guiding and positioning the bone trimming ring.

[0010] In the embodiments of the present application, the bone trimming ring can be positioned at the correct trimming position with the aid of a guide rod, thereby preventing the bone trimming ring from slipping during the trimming process. Since the guide rod is provided, the bone trimming ring can be trimmed into the desired shape more conveniently, simplifying the difficulty of trimming. Moreover, the relatively fixed bone trimming ring is easier to operate and can well control its trimming amount. Therefore, compared with the technical solutions in the prior art, the bone trimmer provided in the embodiments of the present application has better safety and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the implementation methods of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the prior art descriptions. Obviously, the drawings described below are only used to illustrate some implementation methods of the present application. For ordinary technicians in this field, without paying creative work, they can also obtain other technical features, connection relationships and even method steps not mentioned in the drawings based on these drawings.

[0012] Figure 1 is a schematic diagram of the three-dimensional structure of the bone trimmer according to the first embodiment of the present application;

[0013] Figure 2 is a schematic diagram of the bone surface to be trimmed;

[0014] Figure 3 is a schematic diagram of drilling a pilot hole in the bone surface by a conventional initial drill;

[0015] Figure 4 This is a schematic diagram of inserting the guide rod into the positioning hole;

[0016] Figure 5 is a schematic diagram of the trimmed bone surface;

[0017] Figure 6 is a schematic structural diagram of the bone trimmer when a protruding structure is formed on the bone trimming ring in the first embodiment of the present application;

[0018] Figure 7 is a schematic diagram of the three-dimensional structure of the bone trimmer according to the second embodiment of the present application when the guide rod is removed;

[0019] Figure 8 is a schematic cross-sectional structure diagram of the bone trimmer according to the second embodiment of the present application when the guide rod is removed;

[0020] Fig. 9 is a schematic cross-sectional structure diagram of the bone trimmer according to the third embodiment of the present application when the guide rod and the bone trimming ring are removed;

[0021] Fig.10is a schematic cross-sectional structure diagram of the bone trimmer after assembly in the third embodiment of the present application;

[0022] Fig.11 is a schematic cross-sectional structure diagram of the bone trimmer according to the fourth embodiment of the present application when the bone trimming ring is removed;

[0023] Fig.12 is a schematic cross-sectional structure diagram of the bone trimmer after assembly in the fifth embodiment of the present application;

[0024] Fig.13 is a schematic cross-sectional structural diagram of a bone trimming ring of a bone trimmer according to a sixth embodiment of the present application;

[0025] Fig.14 It is a schematic cross-sectional structure diagram of a bone trimming ring of a bone trimmer according to a seventh embodiment of the present application.

[0026] Description of reference numerals:

[0027] 1-main body; 11-interface; 12-accommodation hole;

[0028] 2-bone trimming ring; 21-accommodating hole; 22-sleeve hole; 221-first hole cavity; 222-second hole cavity; 223-blocking member; 23-accommodating cavity; 24-transmission member; 25-trigger button; 26-reset spring;

[0029] 3-guide rod; 31-positioning ring;

[0030] 4- Initial drilling;

[0031] 5- Positioning holes. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this application.

[0033] Implementation Method 1

[0034] The present application provides a bone trimmer.

[0035] The inventors of the present application have found that in the prior art, the bone trimming methods used often fail to achieve good results. When using a ball drill to trim the bone surface, it is easy to slip, and the damage caused will significantly increase the patient's pain and may cause additional damage to the bone surface or soft tissue. Some conventional alternative solutions cannot completely replace the role of the ball drill. For example, doctors sometimes use bone rongeurs to trim the bone surface, but the convenience of tools such as bone rongeurs is much worse than that of a ball drill. Moreover, in some narrow spaces or corners, the beak of the bone rongeurs is difficult to enter the trimming space, and the trimming effect cannot be achieved in all cases.

[0036] In order to solve the above problems, the first embodiment of the present application provides a bone trimmer, see Figure 1 As shown, including:

[0037] A main body 1, on which an interface 11 for connecting an external rotating power device is provided;

[0038] A bone trimming ring 2 is sleeved on the end of one side of the main body 1 to rotate coaxially with the main body 1. The bone trimming ring 2 is used to trim the bone surface;

[0039] The guide rod 3 is coaxially arranged relative to the bone trimming ring 2 and is used for guiding and positioning the bone trimming ring 2 .

[0040] In the embodiment of the present application, the main body 1 can be rod-shaped or in other suitable shapes. Generally speaking, the main body 1 can be made of metal or alloy materials that are easy to process and have good strength, and provide sufficient flexibility. The bone trimming ring 2 can be made of metal, alloy, and more wear-resistant ceramics. In actual use, the bone trimming ring 2 will play an important role in grinding and trimming. Therefore, the bone trimming ring 2 can have a relatively rough surface. According to different needs, bone trimming rings 2 with different roughness can also be provided.

[0041] The interface 11 provided on the main body 1 is not limited, as long as it can be tightly connected to an external rotary power device. Optionally, this interface 11 can be a standard interface of a dental mobile phone to improve the convenience of use.

[0042] The guide rod 3 mainly plays the role of guiding and positioning, so that the bone trimming ring 2 can correctly act on the alveolar bone surface to be trimmed. The guide rod 3 usually does not have grinding ability.

[0043] Optionally, the guide rod 3 can be relatively fixedly connected to the bone trimming ring 2 and coaxially rotate with the bone trimming ring 2. Further, the guide rod 3 can be integrally formed with the bone trimming ring 2. When the guide rod 3 is configured to coaxially rotate with the bone trimming ring 2, the integrated guide rod 3 and the bone trimming ring 2 have a relatively simple structure, so that maintenance is more convenient, and the service life of the bone trimmer can be extended.

[0044] exist Figure 2 In the figure, a bone surface to be trimmed is shown. Through CT imaging examination, the specifications of the implant to be implanted can be predicted. Since the bone trimmer is structurally improved compared to the prior art, the embodiment of the present application also proposes a new bone trimming method, which includes the following steps:

[0045] See also Figure 3 As shown, bone surface positioning preparation is performed on the bone surface to be trimmed. Specifically, a positioning hole 5 can be drilled on the bone surface by a conventional initial drill 4 (pilot drill). Of course, the positioning hole 5 can also be obtained by other methods;

[0046] The bone trimmer is mounted on a dental handpiece, and the bone trimmer can be rotated by the rotational power of the dental handpiece. Figure 4 As shown, the guide rod 3 is inserted into the positioning hole 5, and the bone surface can be trimmed by the bone trimming ring 2; Figure 5 The trimmed bone surface is indicated.

[0047] Afterwards, the positioning hole 5 can be directly used as an implantation hole to directly implant an implant, or the positioning hole 5 can be further trimmed so that the size of the hole and the implant can be better matched during implantation.

[0048] For example, for implants with a 4.0x10 mm diameter, see Figure 2 , Figure 3 As shown, on the uneven bone surface, preliminary drilling is performed using a conventional 2.0 mm diameter pilot drill, and the depth of the positioning hole 5 is about 6 mm;

[0049] See also Figure 4 , Figure 5 As shown, the bone trimmer is mounted on the dental handpiece, and the guide rod 3 enters the positioning hole 5 to flatten the bone surface without increasing the width and depth of the positioning hole 5;

[0050] After the bone surface is trimmed, a 3.0 mm diameter drill, a 3.5 mm diameter drill, and a 4.0 mm diameter drill are used to gradually expand the diameter and depth of the positioning hole 5. When the depth reaches 11 mm, the expected 4.0x10 mm implant is implanted and buried 1 mm below the bone to complete the implant placement.

[0051] The bone trimming ring 2 of the bone trimmer proposed in the embodiment of the present application can have various sizes and structures. For example, for implants of different diameters and different bone types, bone trimming rings 2 with diameters ranging from 3.3mm, 3.5mm, 3.75mm, 4.0mm to 4.2mm can be selected. For another example, in some specific demand scenarios, the surface of the bone trimming ring 2 can also have different roughness to facilitate the trimming of bones of different hardness. The bone trimming ring 2 can be provided with a ruler, or a laser printed scale can be used to locate the implantation depth, wherein the minimum unit of the scale can be 1mm. The ruler or scale provided facilitates the control of the depth.

[0052] The length of the guide rod 3 extending from the bone trimming ring 2 can be in the range of 2.5 mm to 3.5 mm, or even in a larger range. When the extending length of the guide rod 3 is consistent with the positioning hole 5, the guide rod 3 can touch the bottom of the positioning hole 5 during use, which is more convenient. Moreover, the surface of the bone trimming ring 2 extending from the guide rod 3 can also form a concave or convex structure with the position of the guide rod 3 as the center. Figure 6 For example, the raised structure formed on the bone trimming ring 2 can prevent the rotation of the guide rod from damaging the deep nerves and blood vessels while trimming the bone surface.

[0053] In the embodiment of the present application, the bone trimming ring 2 can be positioned at the correct trimming position with the help of the guide rod 3, thereby preventing the bone trimming ring 2 from slipping during the trimming process. Since the guide rod 3 is provided, it can help the bone trimming ring to be trimmed into the desired shape more conveniently, simplifying the difficulty of trimming. Moreover, the relatively fixed bone trimming ring 2 is easier to operate and can well control its trimming amount. Therefore, compared with the technical solutions in the prior art, the bone trimmer provided by the embodiment of the present application has better safety and reliability.

[0054] Implementation Method 2

[0055] The second embodiment of the present application provides a bone trimmer, which is substantially the same as the bone trimmer of the first embodiment, with the main difference being that, in the first embodiment of the present application, the guide rod 3 can be relatively fixedly connected to the bone trimming ring 2 and rotate coaxially with the bone trimming ring 2; whereas, in the second embodiment of the present application, the guide rod 3 can rotate freely relative to the bone trimming ring 2.

[0056] Although the guide rod 3 does not have the grinding ability, it will still generate a force on the bone surface in the positioning hole 5 during the high-speed rotation of the bone trimming ring 2, causing discomfort to the patient. Therefore, when the guide rod 3 is set to be able to rotate freely relative to the bone trimming ring 2, the rotation of the bone trimming ring 2 will not drive the guide rod 3 to rotate, which can reduce this force, improve the patient's comfort, and prevent the guide rod 3 from possibly causing wear and damage to the positioning hole 5.

[0057] Since implant surgeries are mostly performed with multiple implants, the implants need to maintain a certain degree of parallelism with each other. Therefore, after the positioning holes 5 are drilled, the guide rods 3 can be temporarily placed in the bone to check the parallelism of the multiple implants.

[0058] After the parallelism of all teeth to be implanted is confirmed, the bone surface can be trimmed one by one in sequence, and then the guide rods 3 can be removed uniformly, thereby increasing the implantation efficiency and ensuring the implantation effect.

[0059] In the embodiment of the present application, the guide rod 3 can be freely rotated relative to the bone modification ring 2 in a variety of ways. Figure 7 and Figure 8 As shown, the bone trimming ring 2 and the main body 1 can be integrally formed, and a receiving hole 21 for receiving the guide rod 3 is formed in the bone trimming ring 2 or even deep inside the main body 1 .

[0060] The guide rod 3 and the main body 1 can be assembled by simply inserting the guide rod 3 into the receiving hole 21. In order to facilitate the positioning of the implantation depth, the guide rod 3 can also be provided with a scale of about 1mm-10mm, and the scale interval can be 1mm.

[0061] Implementation Method 3

[0062] The second embodiment of the present application provides a bone trimmer, and the bone trimmer of the third embodiment is substantially the same as the bone trimmer of the second embodiment, the main difference being that in the second embodiment of the present application, the bone trimming ring 2 and the main body 1 are integrally formed; while in the third embodiment of the present application, see Fig. 9 , Fig.10 As shown, a sleeve hole 22 penetrating the rotation axis is formed on the bone trimming ring 2, and the bone trimming ring 2 is sleeved on the main body 1 through the sleeve hole 22;

[0063] A receiving hole 12 is formed on the main body 1 at a position facing the sleeve hole 22;

[0064] The tail end of the guide rod 3 passes through the sleeve hole 22 and enters the accommodating hole 12 , and the head end extends out of the sleeve hole 22 .

[0065] Compared with the one-piece design, this solution allows the bone trimming ring 2 to be removed from the main body 1 by providing the sleeve hole 22. Thus, one main body 1 can be used to match multiple models of bone trimming rings 2, reducing costs.

[0066] The main body 1 can be screwed into the sleeve hole 22, or one or more keys can be provided in the sleeve hole 22, so that when the main body 1 is inserted into the sleeve hole 22, force can be applied to the bone trimming ring 2 through these keys. It is worth mentioning that when the main body 1 is screwed into the sleeve hole 22, the direction of its thread can match the direction of the external rotary power device, so that when the rotary power device drives the main body 1 to rotate, the bone trimming ring 2 is more difficult to fall off.

[0067] Specifically and optionally, see Fig. 9 As shown, the sleeve hole 22 may have a first cavity 221 and a second cavity 222, the diameter of the first cavity 221 is larger than the diameter of the second cavity 222, and the main body 1 is sleeved in the first cavity 221. The first cavity 221 is set to be larger than the diameter of the second cavity 222. During grinding, the main body 1 will simultaneously apply a certain degree of pressure to the bone trimming ring 2, and this pressure can be set to be applied to the bottom wall where the first cavity 221 and the second cavity 222 meet. Blocked by this bottom wall, the rotational movement of the bone trimming ring 2 will have better stability.

[0068] Implementation Method 4

[0069] The fourth embodiment of the present application provides a bone trimmer. The bone trimmer of the fourth embodiment is a further improvement of the bone trimmer of the third embodiment. The main improvement is that, in the fourth embodiment of the present application, see Fig.11 As shown, the guide rod 3 is formed with a positioning ring 31 along the circumferential direction. When the guide rod 3 passes through the sleeve hole 22, the surface of the positioning ring 31 facing the head end of the guide rod 3 contacts the bottom wall at the junction of the first cavity 221 and the second cavity 222.

[0070] The guide rod 3 can be well restricted in the first cavity 221 by the positioning ring 31, thereby preventing the guide rod 3 from sliding out of the accommodating hole 12, so that the overall structure of the bone trimmer is more stable.

[0071] Implementation Method 5

[0072] The fifth embodiment of the present application provides a bone trimmer. The bone trimmer of the fifth embodiment is a further improvement of the bone trimmer of the fourth embodiment. The main improvement is that, in the fifth embodiment of the present application, referring to Fig.12 As shown, a blocking member 223 is also provided. When the guide rod 3 passes through the sleeve hole 22, the surface of the positioning ring 31 facing away from the head end of the guide rod 3 contacts one side of the blocking member 223;

[0073] When the main body 1 is inserted into the first cavity 221 , it abuts against the other side of the blocking member 223 .

[0074] When the guide rod 3 is relatively fixed to the bone trimming ring 2 , the blocking member 223 can better ensure that the freedom of the guide rod 3 is not affected by the main body 1 .

[0075] The blocking member 223 can be arranged in a variety of ways. In the embodiment of the present application, the blocking member 223 can be formed together with the guide rod 3 by 3D printing, and formed on the inner wall of the first cavity 221 in an integrally formed manner. Of course, it can also be welded at this position after the guide rod 3 is installed. Even, the blocking member 223 can be arranged to be movable, similar to the shape of a latch. These setting schemes have their own advantages and disadvantages, and ordinary technicians in this field can choose according to actual needs.

[0076] Implementation Method 6

[0077] The sixth embodiment of the present application provides a bone trimmer. The bone trimmer of the sixth embodiment is a further improvement of the bone trimmer of the fourth embodiment. The main improvement is that, in the fifth embodiment of the present application, referring to Fig.13 As shown, a receiving cavity 23 is formed in the bone trimming ring 2, and an opening is formed in the side wall of the first hole 221. A transmission member 24 is arranged in the receiving cavity 23, and a trigger button 25 is arranged on the bottom wall where the first hole 221 and the second hole 222 meet.

[0078] The two ends of the transmission member 24 are respectively connected to the trigger button 25 and the blocking member 223;

[0079] When the guide rod 3 passes through the sleeve hole 22 , the trigger button 25 is pressed to drive the blocking member 223 to extend from the opening to block the guide rod 3 .

[0080] It should be noted that Fig.13 The transmission member 24 is only a schematic diagram of an embodiment. In actual use, a person skilled in the art can match a suitable shape of the transmission member 24 according to needs.

[0081] Optionally, in the embodiment of the present application, a reset spring 26 may be further included. The reset spring 26 is used to reset the position of the transmission member 24. The reset spring 26 may be connected to the blocking member 223, the trigger button 25 or the transmission member 24 as required. Preferably, the reset spring 26 may be as follows: Fig.13 The torsion spring shown is arranged on the rotating shaft of the transmission member 24.

[0082] Compared with the fixed blocking member 223, the movable blocking member 223 facilitates the removal of the guide rod 3, so that the same guide rod 3 can be adapted to different bone trimmers, thereby reducing the cost.

[0083] Implementation Method 7

[0084] The seventh embodiment of the present application provides a bone trimmer. The bone trimmer of the seventh embodiment is a further improvement of the bone trimmer of the sixth embodiment. The main improvement is that, in the sixth embodiment of the present application, referring to Fig.14 As shown, the transmission member 24 is a pipe filled with liquid and is driven by hydraulic means.

[0085] Specifically, the transmission member 24 includes a transmission pipe and a piston connected to the blocking member 223. When the guide rod 3 passes through the sleeve hole 22, the trigger button 25 is pressed, so that the liquid in the transmission pipe is compressed and the piston is pushed to move. The piston pushes the blocking member 223 out of the opening of the accommodating cavity, thereby completing the position limitation of the positioning ring 31 of the guide rod 3.

[0086] Compared with mechanical transmission, the structure of hydraulic transmission is simpler and easier to be arranged in a bone trimming ring 2 with a smaller volume.

[0087] It should be understood that the terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms of "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings, and "multiple" generally includes at least two, but does not exclude the inclusion of at least one.

[0088] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0089] It should be understood that, although the terms first, second, third, etc. may be used to describe certain components in the embodiments of the present application, these components should not be limited to these terms. These terms are only used to distinguish the components from each other. For example, without departing from the scope of the embodiments of the present application, the first so-and-so component may also be referred to as the second so-and-so component, and similarly, the second so-and-so component may also be referred to as the first so-and-so component.

[0090] Depending on the context, the words "if" and "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to monitoring." Similarly, depending on the context, the phrases "if it is determined" or "if monitoring (stated condition or event)" may be interpreted as "when determining" or "in response to determining" or "when monitoring (stated condition or event)" or "in response to monitoring (stated condition or event)."

[0091] In the embodiments of the present application, "substantially equal to", "substantially perpendicular to", "substantially symmetrical", etc. means that the macroscopic size or relative position relationship between the two features is very close to the relationship mentioned. However, those skilled in the art know that due to objective factors such as errors and tolerances, the position relationship of objects is difficult to be constrained exactly at a small scale or even at a microscopic angle. Therefore, even if there is a slight error in the size and position relationship between the two, it will not have a significant impact on the realization of the technical effect of the present application.

[0092] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a product or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such a product or system. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the product or system including the elements.

[0093] In each of the above-mentioned embodiments, although the above-mentioned methods are illustrated and described as a series of actions for simplicity of explanation, a person skilled in the art should understand and appreciate that these methods are not limited by the order of the actions, because according to one or more embodiments, some actions may occur in a different order and / or concurrently with other actions from those illustrated and described herein or not illustrated and described herein but understandable to those skilled in the art.

[0094] In addition, those skilled in the art will appreciate that in order to enable readers to better understand the present application, the embodiments of the present invention provide many technical details. However, even without these technical details and various changes and modifications based on the above-mentioned embodiments, the technical solutions claimed for protection by the claims of the present application can be basically realized. Therefore, in practical applications, various changes can be made to the above-mentioned embodiments in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A bone trimmer, characterized in that: include: A main body, wherein the main body is provided with an interface for connecting an external rotating power device; A bone trimming ring is sleeved on the end of one side of the main body to rotate coaxially with the main body, and the bone trimming ring is used to trim the bone surface; A guide rod, coaxially arranged relative to the bone trimming ring, for guiding and positioning the bone trimming ring; The guide rod can rotate freely relative to the bone trimming ring; The bone trimming ring is formed with a sleeve hole penetrating the rotation axis, and the bone trimming ring is sleeved on the main body through the sleeve hole; A receiving hole is formed on the main body at a position facing the sleeve hole; The tail end of the guide rod passes through the sleeve hole and enters the receiving hole, and the head end extends out of the sleeve hole; The guide rod can be removed relative to the bone modification ring to be placed in the bone for checking the parallelism of multiple dental implants.

2. The bone trimmer according to claim 1, characterized in that: The sleeve hole has a first hole cavity and a second hole cavity, the diameter of the first hole cavity is greater than the diameter of the second hole cavity, and the main body is sleeved in the first hole cavity.

3. The bone trimmer according to claim 2, characterized in that: The guide rod is formed with a positioning ring along the circumferential direction. When the guide rod is inserted into the sleeve hole, the surface of the positioning ring facing the head end of the guide rod contacts the bottom wall at the junction of the first cavity and the second cavity.

4. The bone trimmer according to claim 3, characterized in that: A blocking member is also provided, and when the guide rod is inserted into the sleeve hole, the surface of the positioning ring facing away from the head end of the guide rod contacts one side of the blocking member; When the main body is sleeved in the first cavity, it abuts against the other side of the blocking member.

5. The bone trimmer according to claim 4, characterized in that: The bone trimming ring further has an accommodating cavity formed therein, the accommodating cavity has an opening formed on the side wall of the first cavity, a transmission member is arranged in the accommodating cavity, and a trigger button is arranged on the bottom wall where the first cavity and the second cavity meet; Two ends of the transmission member are respectively connected to the trigger button and the blocking member; When the guide rod passes through the sleeve hole, the trigger button is pressed to drive the blocking member to extend from the opening to form a block for the guide rod.

6. The bone trimmer according to claim 5, characterized in that: Also includes: A return spring is used to return the position of the transmission member.

7. The bone trimmer according to any one of claims 1 to 6, characterized in that: The surface of the bone trimming ring extending out of the guide rod forms a concave or convex structure with the position of the guide rod as the center.

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