A bone extraction drill

Abstract

The utility model provides a bone drill, including a protective shell, a drive shaft, an inner ring cutting blade and an outer ring cutting blade; the protective shell has a containing inner cavity and a clearance gap laterally connected to the containing inner cavity, and the clearance gap also extends to the end of the protective shell; the drive shaft passes through the head end of the protective shell to extend into the containing inner cavity, the inner ring cutting blade and the outer ring cutting blade are arranged in the containing inner cavity of the protective shell and assembled on the drive shaft, the drive shaft, the inner ring cutting blade and the outer ring cutting blade are distributed in sequence from the inside to the outside and are coaxially arranged, and the inner ring cutting blade and the outer ring cutting blade are partially exposed in the clearance gap. In this way, a bone block of a set shape can be directly cut out without additional processing, and bone material is saved; at the same time, the area that does not need to be cut is blocked by the protective shell, and the protective shell can well protect the soft tissue from being scratched.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, specifically to a bone harvesting drill. Background Technology

[0002] Dental implantation requires meeting certain indications. Besides the patient's physical condition being able to tolerate the surgery, sufficient alveolar bone height and width are also necessary. Due to factors such as trauma, congenital malformations, tumor resection, denture wear, and chronic periodontitis, many patients seeking implant treatment have insufficient bone volume. Reduced alveolar bone width and height are limiting factors for implantation. Cases of narrowed interdental spaces caused by prolonged tooth loss and adjacent tooth displacement are also widespread.

[0003] There are many clinical methods for addressing insufficient bone volume, such as onlay bone grafting, GBR-guided bone regeneration surgery, and bone splitting, all of which have proven successful in clinical practice. Depending on the surgical objective and the amount of bone required for transplantation, different types of bone graft materials can be selected. Autologous bone, due to its excellent biocompatibility, osteogenic, osteoinductive, and osteoguided properties, remains the best bone graft material and is considered the gold standard for selecting bone graft materials.

[0004] Autologous bone is typically harvested from the outer buccal plate, the external oblique crest of the mandible, the maxillary tuberosity, and the anterior nasal spine, and can be obtained in granular or block form depending on the surgical needs. Regarding block-shaped bone harvesting, a common clinical approach is to use a hollow drill to obtain a columnar autologous bone column. The structure of the hollow drill is shown in CN208404738U, which discloses a bone harvesting drill bit. The harvested bone block is a solid bone column; bone blocks used to restore buccal bone defects include... Figure 1 As shown, the outer side of bone block 1 is an arc-shaped outer arc segment 2, and the inner side is a straight line segment 3. Furthermore, there is an inner arc segment 4 concentric with the outer arc segment 2 in the middle of the inner side, resembling a crescent shape. If actual needs require... Figure 1 When processing bone block 1 as shown, it is necessary to hollow out the center of the solid bone column and cut it along the axial direction to obtain it, which is troublesome and wastes bone material; moreover, the completely exposed hollow drill poses a risk of soft tissue abrasion. Utility Model Content

[0005] Therefore, to solve the above problems, this utility model provides a bone extraction drill.

[0006] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0007] A bone harvesting drill includes: a protective shell, a drive shaft, an inner ring cutting edge, and an outer ring cutting edge; the protective shell has a receiving cavity and a clearance notch laterally communicating with the receiving cavity, the clearance notch extending to the end of the protective shell; the drive shaft passes through the first end of the protective shell to extend into the receiving cavity, the inner ring cutting edge and the outer ring cutting edge are disposed within the receiving cavity of the protective shell and mounted on the drive shaft, the drive shaft, the inner ring cutting edge and the outer ring cutting edge are distributed sequentially from the inside to the outside and are coaxially arranged, the inner ring cutting edge and the outer ring cutting edge are both partially exposed in the clearance notch.

[0008] Furthermore, the end of the protective shell is tapered or tapered at the tip.

[0009] Furthermore, the protective shell is cylindrical, and the clearance notch is a "D"-shaped notch cut off on one side of the cylindrical protective shell.

[0010] Furthermore, the protective housing includes a hollow receiving shell and a head end cap that covers the head end of the receiving shell. The head end cap has a mounting hole, and the drive shaft passes through the mounting hole of the head end cap and is rotatably assembled with the head end cap through a bearing. The clearance notch is formed on the receiving shell.

[0011] Furthermore, a limiting recess is provided on the inner wall of the receiving shell, and the end of the drive shaft inserted into the receiving cavity is restricted within the limiting recess.

[0012] Furthermore, both the inner and outer ring cutting edges have serrated edges at their ends.

[0013] Furthermore, cooling holes are provided on the sidewalls of both the inner and outer ring cutting blades, a hollow channel is formed inside the drive shaft, and an outlet communicating with the hollow channel is provided in the part of the drive shaft that accommodates the inner cavity. The inlet of the hollow channel is located at the end of the drive shaft located outside the protective housing.

[0014] The technical solution provided by this utility model has the following beneficial effects:

[0015] Using the bone-harvesting drill of this application, the inner and outer ring cutting edges are partially exposed in the clearance notch of the protective shell, which can directly cut out bone blocks of a predetermined shape without additional processing and save bone material; at the same time, the area that does not need to be cut is covered by the protective shell, which can effectively protect soft tissue from abrasion. Attached Figure Description

[0016] Figure 1 The diagram shown is a schematic representation of the crescent-shaped bone block.

[0017] Figure 2The diagram shown is a schematic of the bone-taking drill in the embodiment.

[0018] Figure 3 The image shown is a side view of the bone-taking drill in the embodiment.

[0019] Figure 4 The diagram shown is a schematic of the bone-taking drill being positioned directly opposite the distal end in the embodiment.

[0020] Figure 5 The diagram shown is an exploded view of the bone-taking drill in the embodiment.

[0021] Figure 6 The image shown is a cross-sectional view of the bone-taking drill in the embodiment. Detailed Implementation

[0022] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0023] In the description of this invention, terms such as "upper," "lower," "left," "right," "front," and "rear," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a set orientation, or be constructed and operated in a set orientation. Therefore, they should not be construed as limitations on this invention.

[0024] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0025] This embodiment provides a bone-harvesting drill for drilling out bone fragments such as… Figure 1 The crescent-shaped bone shown; see reference. Figures 2 to 6 As shown, the bone-harvesting drill includes a protective housing 10, a drive shaft 20, an inner ring cutting edge 40, and an outer ring cutting edge 30. The protective housing 10 has a receiving cavity 101 and a clearance notch 102 laterally communicating with the receiving cavity 101. The clearance notch 102 also extends to the end 13 of the protective housing 10. The drive shaft 20 passes through the first end of the protective housing 10 to extend into the receiving cavity 101. The inner ring cutting edge 40 and the outer ring cutting edge 30 are disposed within the receiving cavity 101 of the protective housing 10 and mounted on the drive shaft 20. The drive shaft 20, the inner ring cutting edge 40, and the outer ring cutting edge 30 are distributed sequentially from the inside to the outside and are coaxially arranged. Both the inner ring cutting edge 40 and the outer ring cutting edge 30 are partially exposed in the clearance notch 102. Figure 4 As shown.

[0026] Specifically, the outer ring cutting blade 30 is directly fixed on the drive shaft 20, and the inner ring cutting blade 40 is sleeved on the drive shaft 20 and inserted into the limiting hole of the outer ring cutting blade 30 to achieve assembly. The rotation of the drive shaft 20 can simultaneously drive the inner ring cutting blade 40 and the outer ring cutting blade 30 to rotate, thereby realizing the cutting operation.

[0027] During bone harvesting, the clearance notch 102 of the protective shell 10 is aligned with the bone portion to be harvested. The inner ring cutting blade 40 and the outer ring cutting blade 30 cut the bone respectively. Specifically, only the portion exposed through the clearance notch 102 can contact and cut the bone. The protective shell 10 isolates the cutting blades from surrounding soft tissues (such as gums) to prevent injury from the rotating cutting blades. After cutting, the bone is directly obtained as shown in the image. Figure 1 The crescent-shaped bone block 1 shown is cut by the outer ring cutting blade 30 at the outer arc segment 2 of bone block 1, and by the inner ring cutting blade 40 at the inner arc segment 4 of bone block 1. The straight segment 3 represents the original sidewall of the bone. The cut is as follows: Figure 1 The shape of bone block 1 shown is more in line with the actual needs of surgery, and the surface of the cut bone block 1 is rough, so it can be slightly trimmed and used in the bone graft area without the need for additional instruments to grind it.

[0028] Using the bone-harvesting drill of this application, the inner ring cutting edge 40 and the outer ring cutting edge 30 are partially exposed in the clearance notch 102 of the protective shell 10, which can directly cut out bone blocks of a set shape without additional processing and save bone material; at the same time, the area that does not need to be cut is covered by the protective shell 10, and the protective shell 10 can effectively protect soft tissue from abrasion.

[0029] Specifically, in this embodiment, the protective shell 10 is cylindrical, and the clearance notch 102 is a "D"-shaped notch cut out on one side of the cylindrical protective shell 10 to obtain the desired shape. Figure 1 The image shows a crescent-shaped bone block 1. Of course, in other embodiments, the protective shell 10 can also be a square column or other shape, and the clearance notch 102 can also be other shapes such as a fan shape.

[0030] Preferably, in this embodiment, the end 13 of the protective shell 10 is a tapered end. This design allows for the separation of soft tissue during the cutting and advancing process, protecting the soft tissue from damage.

[0031] The protective housing 10 includes a hollow receiving shell 11 and a first end cap 12 covering the first end of the receiving shell 11. The first end cap 12 has a mounting hole 15. The drive shaft 20 passes through the mounting hole 15 of the first end cap 12 and is rotatably assembled with the first end cap 12 through a bearing 50. The first end cap 12 serves as the first end of the protective housing 10. The clearance notch 102 is formed on the receiving shell 11. This arrangement facilitates assembly. For example, during assembly, the drive shaft 20 can be assembled onto the first end cap 12 first, followed by the outer ring cutting blade 30 and the inner ring cutting blade 40; finally, the first end cap 12 is placed on the receiving shell 11.

[0032] A limiting recess 14 is provided on the inner wall of the receiving shell 11. The end of the drive shaft 20 inserted into the receiving cavity 101 is restricted within the limiting recess 14. With this arrangement, the rotation of the drive shaft 20 is more stable.

[0033] Of course, in other embodiments, the structure of the protective housing 10 is not limited to this.

[0034] Both the inner ring cutting blade 40 and the outer ring cutting blade 30 have serrated edges at their ends, namely, the serrated edge 41 of the inner ring cutting blade 40 and the serrated edge 31 of the outer ring cutting blade 30; this improves cutting performance. Of course, other blade structures can also be used in other embodiments.

[0035] Cooling holes are provided on the sidewalls of both the inner ring cutting edge 40 and the outer ring cutting edge 30, specifically cooling holes 42 on the sidewall of the inner ring cutting edge 40 and 32 on the sidewall of the outer ring cutting edge 30. A hollow channel 21 is formed inside the drive shaft 20. An outlet 23 connecting to the hollow channel 21 is provided on the portion of the drive shaft 20 that houses the inner cavity 101. The inlet 22 of the hollow channel 21 is located at the end of the drive shaft 20 outside the protective housing 10 (defined as the outer end). This arrangement facilitates the transfer of saline solution. During cutting, saline solution can be injected from the inlet 22 at the outer end of the drive shaft 20. The saline solution flows through the hollow channel 21 and out from the outlet 23, then seeps out sequentially from the cooling holes 42 of the inner ring cutting edge 40 and 32 of the outer ring cutting edge 30. This ensures that the entire cavity is filled with saline solution during drill operation, providing cooling and cleaning. Of course, in other embodiments, other channel designs can be used to achieve the injection of saline solution.

[0036] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims, and all such changes shall be within the scope of protection of the present invention.

Claims

1. A bone drill, characterized in that: include: A protective shell, a drive shaft, an inner ring cutting blade and an outer ring cutting blade; the protective shell has a containing inner cavity and a clearance gap laterally connected to the containing inner cavity, and the clearance gap also extends to the end of the protective shell; the drive shaft passes through the head end of the protective shell to extend into the containing inner cavity, the inner ring cutting blade and the outer ring cutting blade are arranged in the containing inner cavity of the protective shell and assembled on the drive shaft, the drive shaft, the inner ring cutting blade and the outer ring cutting blade are distributed in sequence from the inside to the outside and are coaxially arranged, and the inner ring cutting blade and the outer ring cutting blade are partially exposed in the clearance gap.

2. The bone drill according to claim 1, characterized in that: The end of the protective shell is a tapered end.

3. The bone drill according to claim 1, characterized in that: The protective shell is cylindrical, and the clearance notch is a "D"-shaped notch cut out from one side of the cylindrical protective shell.

4. The bone extraction drill according to claim 1, characterized in that: The protective shell includes a hollow containing shell and a head end cover covering the head end of the containing shell, the head end cover is provided with a mounting hole, the drive shaft is passed through the mounting hole of the head end cover and is rotatably assembled with the head end cover through a bearing; the clearance gap is formed on the containing shell.

5. The bone drill according to claim 4, characterized in that: A limiting recess is provided on the inner wall of the accommodating shell, and the end of the driving shaft inserted into the accommodating inner cavity is limited in the limiting recess.

6. The bone drill according to claim 1, characterized in that: The ends of the inner ring cutting edge and the outer ring cutting edge both have sawtooth-shaped edge portions.

7. The bone drill according to claim 1, characterized in that: Cooling holes are provided on the side walls of the inner ring cutting blade and the outer ring cutting blade, a hollow channel is formed inside the drive shaft, an outlet connected to the hollow channel is provided at the portion of the drive shaft located in the accommodating inner cavity, and an inlet of the hollow channel is arranged at the end of the drive shaft located outside the protective shell.

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