Bone evulsion tool

Abstract

To provide a bone evulsion tool which, in a surgery, such as an MIS, enables a bone, such as a caput femoris, to be easily pulled out.SOLUTION: A bone evulsion tool includes a shaft part 12, a handle part 11 disposed in a base end side of the shaft part, a taper screw part 20 formed in a tip end side of the shaft part and tapered toward the tip end side, and a blade edge part 30 disposed in the tip end side of the taper screw part. The taper screw part has a helical thread part 21 formed on a surface of a shank part 25 which is a shank of the taper screw part. The blade edge part has a tapered plate 31 in a tip end side thereof, and a cutting edge 32 with a cutting face 34 formed in at least one lateral end part.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a bone remover for use in surgery. [Background technology]

[0002] In orthopedic surgery, for example, in total hip replacement surgery, bones (such as the femoral head) are cut and removed. In this case, since the femoral head is deep inside the body, a femoral head extractor is used. can be. FIG. 7 shows the femoral head extractor shown in FIG. 6 of Patent Document 1. The femoral head extractor 100 has a handle portion. The tapered screw portion 103 is made up of a shaft portion 101 and a tapered screw portion 103. The parscrew portion 103 is screwed into the femoral head to remove the femoral head from the surgical field. put out.

[0003] FIG. 8 shows the femoral head extractor shown in FIG. 1 of Patent Document 1. The femoral head extractor 200 is The blade is composed of a drum part 201, a shaft part 202, and a wing-shaped blade 203. The femoral head is removed from the surgical field by inserting and locking the femoral head into the femoral head. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] China Utility Model Publication No. CN21495952 Summary of the Invention [Problem to be solved by the invention]

[0005] The bone is covered with hard cortical bone on the surface and is composed of soft cancellous bone inside. In the case of a femoral head extractor such as that shown in FIG. 8, it is common to insert the femoral head from the cancellous bone at the cut surface. When inserting the femoral head extractor through the femoral head neck cut line, it is necessary to widen the surgical field. This will require a longer skin incision.

[0006] Perform minimally invasive surgery (MIS) In order to achieve this, the length of the skin incision was shortened and the bone extractor was screwed into the cortical bone on the surface of the femoral head. However, due to the high hardness of the cortical bone, the bone remover cannot enter and engage inside the bone.

[0007] The present invention has been made in view of the above points, and its object is to provide a method for preventing the occurrence of vascular endoscopic abnormalities in surgery such as MIS. To provide a bone remover capable of easily removing bones such as the femoral head even when using a surgical instrument. [Means for solving the problem]

[0008] The bone extractor according to the present invention, which has been made to solve the above problems, is inserted into the bone from the surface of the bone. It has an excellent function of being able to stop

[0009] The present invention (1) includes a shaft portion, a handle portion disposed on a base end side of the shaft portion, A tapered screw portion formed on the tip side of the shaft portion and tapered toward the tip side, A bone remover including a blade portion disposed on a distal end side of the tapered screw portion, The tapered screw portion has a helical thread on the surface of a shaft portion which is the shaft of the tapered screw portion. The screw thread portion is formed, and the blade cutting edge portion is a plate-like body tapered toward the tip side, and at least A bone cutting tool characterized in that it has a cutting edge formed by a rake face formed at one or more lateral ends. It is an extractor.

[0010] In the present invention (1), a shaft portion and a handle portion disposed on the base end side of the shaft portion are provided. a tapered screw portion formed at a tip end of the shaft portion and tapered toward the tip end; A bone remover having a blade portion disposed on the tip side of the tapered screw portion. The tapered screw portion has a helical thread on the surface of a shaft portion which is the shaft of the tapered screw portion. The blade cutting edge is a plate-like body having a tapered tip and a lateral direction. The cutting edge is formed by a rake face at the end, so the blade edge can easily cut into the cortical bone. can be perforated. Many conventional products have a drill-shaped tip, which makes it difficult to drill into narrow holes or soft cancellous bone. It is suitable for drilling, but the propulsive force decreases the further it penetrates into hard cortical bone.

[0011] The present invention (2) provides a method for manufacturing a screw thread having at least one base end side surface of the rake face and a tip end of the thread portion. The bone remover of the present invention (1) is characterized in that the top surface of the side is connected to the top surface of the side.

[0012] In the present invention (2), at least one of the faces on the base end side of the rake face and the thread The top surface of the tip of the blade is connected to the hole, so the blade is sharp and can make holes. The tapered screw section connected to the blade edge by a ridge cuts the skin without losing momentum. It can penetrate into the bone. Here, the term "at least one of the faces on the base end side of the rake face" refers to a face having two faces. If the helical thread is a double helix, it may be connected in two places. There may be cases where there are three or four connections.

[0013] In the present invention (3), a notch for self-tapping is formed in the axial direction in the thread portion. The bone remover of the present invention (1) or (2) is characterized in that:

[0014] In the present invention (3), a notch for self-tapping is formed in the axial direction on the thread portion. After the blade part penetrates the cortical bone into the cancellous bone, the tapered screw part penetrates the cortical bone. When the bone is pulled, the notch allows self-tapping of the cortical bone, making it easier to use the bone extractor. This makes it easier to insert and secure the catheter to the bone. Effect of the Invention

[0015] According to the present invention, a bone extraction device that can easily extract bones such as the femoral head in MIS surgery and the like is provided. Equipment can be provided. [Brief description of the drawings]

[0016] [Figure 1] FIG. 1 is a schematic diagram showing the removal of a femoral head in an artificial hip joint surgery using the bone remover of the first embodiment of the present invention. [Diagram 2] FIG. 1 is a perspective view of a bone remover according to a first embodiment of the present invention. [Diagram 3] 1A and 1B are a plan view and a front view of a bone remover according to a first embodiment of the present invention. [Figure 4] FIG. 2 is a plan view showing a tip portion of the bone remover according to the first embodiment of the present invention. [Diagram 5] FIG. 2 is a perspective view showing a tip portion of the bone remover according to the first embodiment of the present invention. [Figure 6] FIG. 11 is a perspective view showing a tip portion of a bone remover according to a second embodiment of the present invention. [Figure 7] This is a conventional bone remover described in Patent Document 1. [Figure 8] This is a conventional bone remover described in Patent Document 1. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. These are essentially preferred examples and are not intended to limit the scope of the invention, its applications, or its uses. It is not intended to

[0018] <Embodiment 1> 1 to 5 show a bone remover according to a first embodiment of the present invention. FIG. 1 shows the femoral head 5 being removed using the bone remover 10 of the first embodiment. is. In surgery, the skin is incised with a scalpel to form the surgical field 1, and retractor hooks 2, 3 and The retractor 4 is used. The femoral neck 6 is cut at the osteotomy line 7 with an electric blade saw or the like. The femoral head 5 is separated by the bone extractor 10. The bone extractor 10 is screwed into the cortical bone of the femoral head 5. After the bone remover 10 is fully screwed into the femoral head 5, the bone remover 10 is pulled. The femoral head 5 can then be removed from the body.

[0019] FIG. 2 is a perspective view of the bone remover 10 according to the first embodiment of the present invention. The handle portion 11 is used to rotate the taper screw portion 20. The handle portion 11 and the shaft portion 12 are T-shaped, but this shape is not necessarily required. It is not limited to this. It can also be applied to things that use power other than hand cranks. do.

[0020] A tapered screw portion 20 is formed on the tip side of the shaft portion 12. The taper screw portion 20 is a surface of a shaft portion 25 (see FIG. 4) which is a shaft of the taper screw portion 20. The tapered screw portion 20 has a spiral thread portion 21 formed thereon. A blade portion 30 is provided.

[0021] FIG. 3 is a plan view (A) and a front view (B) of the bone remover 10 according to the first embodiment of the present invention. The extractor 10 includes a handle portion 11, a shaft portion 12, a tapered screw portion 20, and a thread portion. 21, equipped with a blade cutting portion 30.

[0022] FIG. 4 is a plan view showing the tip of the bone remover according to the first embodiment of the present invention. The distal end portion of the tapered screw portion 20 and the blade cutting portion 30 are shown. The thread portion 21 has a bottom surface 23 on the surface of the shaft portion 25, a slope 24 continuing from the bottom surface 23, and a slope 24. The blade cutting portion 30 has a top surface 22 that is continuous with the tip end. A first cutting edge 32 and a first clearance surface 33 are formed on a plate-like body 31 which is a main body. In this embodiment, the plate-like body 31 is one piece, but two plate-like bodies intersect at a right angle. Alternatively, a modified example having four cutting edges is also possible, and the number of plate-shaped bodies may be three, four, etc. This is also fine.

[0023] FIG. 5 is a perspective view showing the tip of the bone remover according to the first embodiment of the present invention, in which the blade cutting portion 3 0 is formed by a first cutting edge 32 formed by a first rake surface 34 formed at a lateral end of a plate-like body 31. A first flank surface 33 is formed on the front side of the first cutting edge 32. The peg surface 34 and the top surface 22 of the thread portion 21 are connected by a connecting surface 35 .

[0024] By using the structure shown in FIG. 5, the blade cutting portion 30 can sharply drill into the cortical bone. Then, the tapered screw portion 20 connected to the blade cutting edge portion 30 by the connecting surface 35 is driven. The first cutting edge 32 can cut into the cortical bone of the femoral head without losing any bone. The bone chips that are cut are efficiently transferred along the slope 24 and bottom surface 23 of the thread portion 21 shown in FIG. It is discharged.

[0025] <Embodiment 2> FIG. 6 is a perspective view showing a tip of a bone remover according to a second embodiment of the present invention. A blade cutting portion 30 is formed on the tip side of the tube portion 20. The second cutting edge 36 is formed by the second rake face 37 and the second flank face 38, and the first cutting edge 32 and the The first cutting edge 36 and the second cutting edge 37 meet at a vertex 39. The vertex 39 is inserted into the cortical bone, and the first cutting edge 37 is The blade 32 and the second cutting blade 36 excavate the cortical bone.

[0026] The bone remover of the second embodiment is characterized in that the tip of the tapered screw portion 20 is provided with a self-tapping The notch 40 is provided on the two threaded portions 21 on the tip side. The notch 40 may be formed on the opposite side of the axial rotation by 180°. The cutout 40 may be provided at three or four places on the target. The notched cutting edge 4 is formed at the boundary between the top surface 22 and the first notched surface 42. The notched cutting edge 41 is formed on the blade edge portion 30. When the cortical bone remains after the cortical bone is excavated, the notched cutting edge 41 is used to excavate the cortical bone. Can be perforated. [Industrial Applicability]

[0027] As described above, the bone extractor of the present invention is capable of extracting bones such as femoral heads in MIS and other surgeries. The present invention can be suitably used as a bone remover that can easily remove bones. [Explanation of symbols]

[0028] 1; Surgical field 2, 3, 4; retractor hook 5;Femoral head (bone) 6; head and neck 7; Osteotomy line 10. Bone remover 11;Handle section 12; Shaft section 20: Tapered screw section 21;Threaded part 22;Top surface 30;Blade cutting edge 31; Plate-shaped body 32; First cutting edge 33: First relief face 34: First scooping face 35;Connection surface 36; 2nd cutting edge 37; Second scooping face 38; Second relief face 39; Vertex 40;Notch 41;Notched cutting edge 42: First cutout surface 43: Second cutout surface

Claims

1. A shaft portion, a handle portion disposed on a proximal end side of the shaft portion, and A tapered screw portion formed on the tip side and tapered toward the tip side, A bone remover having a blade portion disposed on the distal end side of a bone extractor, The tapered screw portion has a helical thread on the surface of a shaft portion which is the shaft of the tapered screw portion. A screw thread is formed, The blade cutting portion is a plate-like body having a tapered tip end and at least one lateral end A bone remover characterized in that it has a cutting edge formed by a rake surface at a portion.

2. At least one of the faces on the base end side of the rake face and the top surface on the tip end side of the thread portion are connected.

2. The bone remover according to claim 1, further comprising a stud.

3. The thread portion is characterized in that a notch for self-tapping is formed in the axial direction. A bone remover according to claim 1 or 2.

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