Bone taking trephine with fret saw at far end

Abstract

The invention provides a bone taking trephine with a fret saw at the far end, which relates to the technical field of medical equipment and comprises a hollow tubular saw rod, a handle transversely connected to the top of the saw rod, the fret saw, a rotating shaft and the like. Annular sawteeth are arranged at the bottom of the saw rod, two channels penetrating through the two ends of the saw rod are symmetrically formed in the saw rod, the fret saw penetrates through the two channels and the channel in the rotating shaft, the two ends of the fret saw are screwed and fixed through nuts on the handle, and the tip end of the fret saw penetrates into the bottom of the guide piece after penetrating out of the top of the handle. The fret saw located at the saw teeth at the tail end of the saw rod is attached to the interior of a semi-annular groove in the inner wall of the tail end of the saw rod, and pressure and rotating torsion are applied to the saw rod through the handle in the using process; after the saw rod completes longitudinal cutting of the bone, the fretsaw is tightened to enable the fretsaw at the saw tooth position of the tail end of the saw rod to be tightened, at the moment, the saw rod is rotated to drive the fretsaw to transversely saw off the bottom of the bone column step by step, and the bone column can be cut easily, conveniently and efficiently.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a bone harvesting ring saw with a wire saw at the distal end. BACKGROUND

[0002] The bone harvesting ring saw is mainly used for harvesting autologous bone or removing diseased bone tissue, and is widely welcomed by surgeons due to its minimally invasive feature. However, the existing bone harvesting ring saw is difficult to effectively and completely cut the columnar bone, the main reason being that the existing bone harvesting ring saw cannot effectively cut the bone connection between the bottom of the bone column and the bone harvesting area, often requiring the incision to be lengthened to harvest the bone, which not only increases the trauma, but also makes the harvested bone fragmented, making it difficult to form effective bone support and meet the needs of block bone grafting, resulting in the need to expand the bone harvesting range and waste bone, and for diseased bone, it may lead to incomplete lesion removal and other problems. SUMMARY

[0003] The present application aims to overcome the shortcomings of the prior art and meet the needs of the present situation, and provides a bone harvesting ring saw with a wire saw at the distal end. The present application can gradually tighten the wire saw by rotating the shaft, and drive the wire saw at the distal end to gradually tighten to achieve transverse cutting of the bone connection between the bottom of the bone column and the bone harvesting area, thereby harvesting the complete columnar bone.

[0004] In order to achieve the purpose of the present application, the technical solution adopted by the present application is as follows: The present application discloses a bone harvesting ring saw with a wire saw at the distal end, which comprises a hollow tubular saw shaft, a handle transversely connected to the top of the saw shaft, a torsional force applied to the saw shaft through the handle, an annular saw tooth provided at the bottom of the saw shaft, and a wire saw. Two channels are symmetrically provided in the saw shaft, the wire saw passes through the two channels and is continuously and attached to the inner wall of the tail end of the saw shaft at the position of the saw tooth; after the saw shaft completes the longitudinal cutting of the bone, the wire saw is tightened to tighten the wire saw at the position of the saw tooth at the tail end of the saw shaft; A wire saw tightening device is provided on the handle for tightening the wire saw.

[0005] The wire saw tightening device comprises a rotating shaft installed in the handle, one end of the wire saw is fixed to the handle, and the other end is wound on the rotating shaft in the handle, and a pulling force is applied to the wire saw by rotating the rotating shaft.

[0006] An annular groove is provided on the rotating shaft, and the wire saw is wound on the annular groove.

[0007] The end of the rotating shaft is provided with a ratchet, the end of the handle is provided with a pressing piece, the end of the pressing piece is provided with an elastic card, and the elastic card is clamped in the ratchet to prevent the rotating shaft from rotating.

[0008] The end of the rotating shaft located outside the handle is fixed with a rotating part, and the rotating part drives the rotating shaft to rotate.

[0009] The handle has a through hole in the middle that communicates with the saw bar.

[0010] A semi-circular groove is provided on the inner wall of the saw bar tail end located at the saw teeth, and the wire saw is located in the semi-circular groove.

[0011] The thickness of the saw teeth gradually decreases from the tail to the tip, and an outwardly inclined slope is formed on the inner wall of the saw teeth.

[0012] The handle has two through holes, through which the two ends of the wire saw pass. The two ends of the handle are each provided with two locking bolts. The two locking bolts are threaded into the handle from both ends, and the ends of the two locking bolts are respectively pressed against the wire saw to fix it.

[0013] The handle is also provided with a guide plate, which presses against the wire saw on the handle.

[0014] The beneficial effects of this invention are as follows: This invention ingeniously combines a ring bone saw with a wire saw to completely and effectively cut columnar bone, achieving minimal bone tissue loss, minimal trauma, simple operation, and high speed. It can be used not only for bone harvesting but also for removing diseased bone tissue. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 for Figure 1 Another perspective structural diagram of the structure shown; Figure 3 This is a schematic diagram of the saw teeth at the end of the saw bar and the internal wire saw structure in this invention. Figure 4 This is a schematic diagram of the rotating shaft structure in the invention; Figure 5 This is a top view of the main structure of the saw bar of the present invention. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments: Example 1: A bone harvesting ring saw with a distal wire saw, see [link to example]. Figures 1 to 5 .

[0017] It includes a hollow tubular saw bar 2 and a handle 1 horizontally connected to the top of the saw bar 2. Torque is applied to the saw bar 2 through the handle 1. To increase rigidity, the upper wall thickness of the saw bar 2 is greater than that of the lower wall thickness. The bottom of the saw bar 2 is provided with annular saw teeth 3. The thickness of the saw teeth 3 gradually decreases from the tail to the tip, and an outward inclined surface is formed on the inner wall of the saw teeth 3 to increase cutting strength. This facilitates the compression of bone tissue into the tube in the middle of the saw bar, reducing bone loss during harvesting.

[0018] It also includes a wire saw 5, in which two channels are symmetrically arranged inside the saw bar 2, passing through both ends of the saw bar 2. The wire saw 5 passes through the two channels and is continuously attached to the inner wall of the tail end of the saw bar 2 at the position of the saw teeth (see...). Figure 4 As shown in the figure), specifically, a semi-circular groove 10 is provided on the inner wall of the end of the saw bar 2 located at the saw tooth 3. The wire saw 5 is located in the semi-circular groove 10. With this design, the wire saw 5 can be "hidden" in the saw bar in the early stage of bone removal, and can be gradually tightened when the bottom of the transverse bone column is removed by the wire saw in the later stage.

[0019] Furthermore, the handle 2 is provided with a wire saw tightening device for tightening the wire saw 5; the wire saw tightening device includes a rotating shaft 9 that rotates to be installed inside the handle, one end of the wire saw 5 is fixed to the handle 2, and the other end is wound around the rotating shaft 9 inside the handle 2, and a pulling force is applied to the wire saw 5 by rotating the rotating shaft 9; at the same time, the rotating shaft 9 is provided with an annular groove 11, and the wire saw 5 is wound around the annular groove 11.

[0020] Furthermore, the end of the rotating shaft 9 is provided with a ratchet 8, the end of the handle 2 is provided with a pressure plate 6, the end of the pressure plate 6 is provided with an elastic clip 7, and the elastic clip 7 is locked in the ratchet 8 to prevent the rotating shaft 9 from rotating.

[0021] Furthermore, a rotating part 12 is fixed to the end of the rotating shaft located outside the handle 2, and the rotating part 12 causes the rotating shaft to rotate.

[0022] Furthermore, the handle has a through hole 4 in the middle that communicates with the saw bar.

[0023] Furthermore, the inner and outer diameters of the saw rod, the wall thickness of the saw rod, and the diameter of the wire saw and the channel on the saw rod through which the wire saw passes are specifically set according to actual operational requirements, and are not specifically limited in this application. For example, the wall thickness of the saw rod is 1mm, the diameter of the channel through which the wire saw passes is 0.5mm, and the diameter of the wire saw is 0.4mm.

[0024] Furthermore, in this embodiment, two through holes are provided on the handle 1, and the two ends of the wire saw 5 pass through the two through holes respectively. Two locking bolts 14 are provided at both ends of the handle 1 respectively. The two locking bolts 14 are threaded into the handle 1 from both ends of the handle, and the ends of the two locking bolts 14 are respectively pressed against the wire saw and the wire saw 5 is fixed. The wire saw can be fixed, replaced, and the tension of the wire saw can be adjusted through these two locking bolts 14.

[0025] Furthermore, the handle is also provided with a guide plate 13, which presses against the wire saw 5 on the handle 1. When the handle 1 is rotated by hand, the guide plate 13 prevents the wire saw from piercing the hand and causing injury.

[0026] In the initial stage of use, the wire saw 5 at the distal end of the saw bar is "hidden" inside the saw bar. At this time, the handle applies torque to the saw bar to cut the columnar bone. When cutting the columnar bone, because the saw teeth at the end of the saw bar are annular, the columnar bone being cut is not separated from the bone body in the bone harvesting area. Then, the rotating shaft applies tension to the wire saw, causing the wire saw at the saw teeth to move out of the annular groove and fit tightly against the side wall of the columnar bone to be cut in a "semi-circular" manner. Then, the saw bar continues to rotate and the rotating shaft is gradually rotated to tighten the wire saw until the columnar bone is cut off. After that, the wire saw at the saw teeth is in a straight, taut state. Then, the saw bar can be directly removed to take out the columnar bone.

[0027] Furthermore, the handle of this design is cylindrical, with the through hole 4 in the middle connected to the central hole inside the saw bar and continuing to the hollow tube in the middle of the saw bar, so that air can escape from the saw bar during bone removal, the bone removal area can be observed, a guide tube / needle can be inserted, and a threaded Kirschner wire can be used to assist in bone removal.

[0028] The embodiments disclosed in this invention are preferred embodiments, but are not limited thereto. Those skilled in the art can easily understand the spirit of this invention based on the above embodiments and make different extensions and variations, but as long as they do not depart from the spirit of this invention, they are all within the protection scope of this invention.

Claims

1. A distal wire saw for bone harvesting, comprising a hollow tubular saw bar and a handle laterally connected to the top of the saw bar, wherein torque is applied to the saw bar via the handle, characterized in that: The bottom of the saw bar is provided with annular saw teeth, and it also includes a wire saw. The saw bar has two channels symmetrically arranged inside, passing through both ends of the saw bar. The wire saw passes through the two channels and is continuously attached to the inner wall of the saw bar tail end at the saw tooth position. When the saw bar completes the longitudinal cutting of the bone, tightening the wire saw can cause the wire saw at the saw tooth position at the saw bar tail end to become taut. The handle is equipped with a wire saw tightening device for tightening the wire saw.

2. The bone harvesting ring saw with distal wire saw as described in claim 1, characterized in that: The wire saw tightening device includes a rotating shaft installed in the handle. One end of the wire saw is fixed to the handle, and the other end is wound around the rotating shaft in the handle. The rotating shaft applies tension to the wire saw.

3. The bone harvesting ring saw with a distal wire saw as described in claim 2, characterized in that: The rotating shaft is provided with an annular groove, and the wire saw is wound around the annular groove.

4. The bone harvesting ring saw with distal wire saw as described in claim 2, characterized in that: The end of the rotating shaft is provided with a ratchet, the end of the handle is provided with a pressure plate, and the end of the pressure plate is provided with an elastic clip. The elastic clip is locked in the ratchet to prevent the rotating shaft from rotating.

5. The bone harvesting ring saw with a distal wire saw as described in claim 2 or 4, characterized in that: A rotating part is fixed to the end of the shaft located outside the handle, and the rotating part causes the shaft to rotate.

6. The bone harvesting ring saw with distal wire saw as described in claim 2, characterized in that: The handle has a through hole in the middle that communicates with the saw bar.

7. The bone harvesting ring saw with a distal wire saw as described in claim 1, characterized in that: A semi-circular groove is provided on the inner wall of the saw bar tail end located at the saw teeth, and the wire saw is located in the semi-circular groove.

8. The bone harvesting ring saw with a distal wire saw as described in claim 1, characterized in that: The thickness of the saw teeth gradually decreases from the tail to the tip, and an outwardly inclined slope is formed on the inner wall of the saw teeth.

9. The bone harvesting ring saw with distal wire saw as described in claim 1, characterized in that: The handle has two through holes, through which the two ends of the wire saw pass. The two ends of the handle are each provided with two locking bolts. The two locking bolts are threaded into the handle from both ends, and the ends of the two locking bolts are respectively pressed against the wire saw to fix it.

10. The bone harvesting ring saw with a distal wire saw as described in claim 9, characterized in that: The handle is also provided with a guide plate, which presses against the wire saw on the handle.

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