Osteotome and device for orthopedic surgery

Abstract

The utility model relates to the technical field of medical instruments, in particular to an osteotome and a device for orthopedic surgery, the osteotome is used for cutting off end plates or cartilages, the osteotome comprises a blade and a handle, the blade is an annular blade with a hollow middle part, an inclined surface inclined towards the hollow middle part is formed on the inner wall of the blade, and the inclined surface is intersected with the outer side wall of the blade to form an annular cutting blade. The osteotome can be used for excising end plates and cartilages, during one-way rotary excision, the middle of the annular cutting edge is hollowed out, tissue chips can be discharged easily, the annular cutting edge formed by intersecting the inclined face and the outer side wall of the cutting edge is sharp, the excising efficiency of the end plates and the cartilages is effectively improved, the operation time is greatly shortened, and the operation efficiency is improved. And the potential risk caused by overlong operation time is reduced. According to the device for the orthopedic surgery, the transmission shaft is connected with the external motor, the external motor rotates to drive the transmission shaft to do one-way rotation motion, and then the cutting edge is driven to do one-way rotation motion to cut off an end plate or cartilage.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to bone cutters and devices for orthopedic surgery. Background Technology

[0002] Endplates are the membranes of muscle cells below the nerve terminals at the neuromuscular junction. There are vertebral endplates and motor endplates. Vertebral endplates are formed after the epiphyseal plates on the upper and lower surfaces of the vertebral body cease ossification during growth and development, resulting in slightly concave endplates. The central part of the vertebral endplate is covered by a thin layer of hyaline cartilage, which persists throughout life; this is the cartilaginous endplate. The upper and lower cartilaginous endplates connect with the nucleus pulposus and annulus fibrosus to form the intervertebral disc. Vertebral endplates form the upper and lower boundaries of the intervertebral disc, located between the cancellous bone in the center of the vertebral body and the intervertebral disc. They consist of subchondral bone approximately 0.5 mm thick and cartilage of equal thickness covering it. Motor endplates are distributed within skeletal muscles and are effectors formed by the axonal terminals of motor neurons and skeletal muscle fibers, innervating muscle fiber contraction.

[0003] In orthopedic surgery, it is often necessary to remove the endplate or cartilage. Traditional hand-held cutting tools are inefficient, while electric cutting tools, whether cutting edge type or steel abrasive type, have the problem of clogging the interdental space, which reduces the efficiency of the removal. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a bone scalpel and an orthopedic surgical device to at least solve the problem that existing bone scalpels, when used to remove endplates or cartilage, can block interdental spaces, leading to a decrease in resection efficiency.

[0005] This utility model solves the above-mentioned technical problems through the following technical means:

[0006] In a first aspect, this utility model provides a bone scalpel for removing endplates or cartilage. The bone scalpel includes a blade and a handle, which are fixedly connected. The blade is an annular blade with a hollow center, and the inner wall of the blade forms an inclined surface that slopes towards the hollow center. The inclined surface intersects with the outer wall of the blade to form an annular cutting edge.

[0007] In conjunction with the first aspect, in some embodiments, the annular cutting edge has two edges, which are located on opposite sides of the blade.

[0008] The bone scalpel of this invention can be used to remove endplates and cartilage. In unidirectional rotational resection, the hollow center of the annular blade facilitates the removal of tissue debris, and the annular cutting edge formed by the intersection of the inclined surface and the outer wall of the blade is relatively sharp, which effectively improves the efficiency of endplate and cartilage resection, greatly reduces the operation time, and reduces the potential risks caused by excessive operation time.

[0009] Secondly, this utility model also provides an orthopedic surgical device, including the bone scalpel described in the first aspect above.

[0010] In conjunction with the second aspect, in some embodiments, the orthopedic surgical device further includes a connecting component and an interface component. The connecting component includes a drive shaft and an outer tube. The drive shaft is connected to the handle, and the outer tube is sleeved on the drive shaft. The interface component includes a front housing and a rear housing, which are connected together. One end of the outer tube is fixedly inserted into the front housing.

[0011] In conjunction with the second aspect, in some embodiments, a first water flow channel is provided between the drive shaft and the outer tube, and the water outlet of the first water flow channel is sprayed toward the blade; the interface assembly has a second water flow channel, and the first water flow channel and the second water flow channel are connected.

[0012] In conjunction with the second aspect, in some embodiments, a support tube is sleeved on the drive shaft, the support tube is eccentrically arranged with respect to the drive shaft, one side of the outer wall of the support tube is in contact with the inner wall of the outer tube, and there is a gap between the other side of the outer wall of the support tube and the inner wall of the outer tube, the gap forming a first water flow channel.

[0013] In conjunction with the second aspect, in some embodiments, the front housing has a radially arranged water inlet hole, the interior of the front housing has a stepped hole, and there is a cavity between the outer wall of the drive shaft and the inner wall of the stepped hole. The cavity constitutes a water injection cavity, which is connected to both the first water flow channel and the water inlet hole. A water-cooling jacket is installed inside the rear housing, and the outer wall of the water-cooling jacket has a spiral channel. The spiral channel, the water inlet hole, and the water injection cavity are connected to form a second water flow channel.

[0014] In conjunction with the second aspect, in some embodiments, a sealing assembly is fitted inside the stepped hole on the drive shaft, the sealing assembly being used to enclose the water injection cavity.

[0015] In conjunction with the second aspect, in some embodiments, the sealing assembly includes a sealing tube and a sealing sleeve, one end of the sealing sleeve being inserted into the sealing tube, and the outer wall of the other end of the sealing sleeve contacting the inner wall of the stepped hole.

[0016] In conjunction with the second aspect, in some embodiments, a bearing is fitted onto the drive shaft, and the bearing is fixed inside a sealing sleeve.

[0017] This invention relates to an orthopedic surgical device that connects a drive shaft to an external motor. The rotation of the external motor drives the drive shaft to rotate in one direction, which in turn drives the blade to rotate in one direction to remove the endplate or cartilage. The annular blade can effectively improve the efficiency of endplate and cartilage removal, greatly reduce the operation time, and reduce the potential risks caused by excessive operation time. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the bone knife of this utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the orthopedic surgical device of this utility model;

[0020] Figure 3 This is a cross-sectional view of an orthopedic surgical device;

[0021] Figure 4 yes Figure 3 Enlarged view of point A in the middle;

[0022] Figure 5 yes Figure 3 Enlarged view of point B in the middle;

[0023] Among them, there are bone knife 100, blade 110, handle 120, inclined surface 111, outer side wall 112, annular cutting edge 113, central hollow 114, drive shaft 210, insertion blind hole 211, outer tube 220, support tube 230, front shell 310, annular groove 311, water inlet hole 312, stepped hole 313, rear shell 320, annular buckle 321, water cooling jacket 330, spiral channel 331, first water flow channel 410, second water flow channel 420, sealing tube 510, sealing sleeve 520, and bearing 600. Detailed Implementation

[0024] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can understand the advantages and effects of this utility model from the content disclosed in this specification. It should be noted that the illustrations provided in the following embodiments are for illustrative purposes only and represent schematic diagrams, not actual pictures. They should not be construed as limiting the utility model. To better illustrate the embodiments of this utility model, some components in the figures may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable that some well-known structures and their descriptions may be omitted in the figures for those skilled in the art.

[0025] In the figures of this utility model embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figure, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe the positional relationship in the figure are only for illustrative purposes and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above-mentioned terms can be understood according to the specific circumstances.

[0026] Please refer to Figure 1 This application discloses a bone scalpel 100 for removing endplates or cartilage. The bone scalpel 100 includes a blade 110 and a handle 120, which are fixedly connected. The blade 110 is an annular blade with a hollow center. The inner wall of the blade 110 forms an inclined surface 111 that slopes towards the hollow center. The inclined surface 111 intersects with the outer wall 112 of the blade 110 to form an annular cutting edge 113. In this embodiment, there are two annular cutting edges 113, which are located on opposite sides of the blade 110.

[0027] The aforementioned bone scalpel 100 can be used to remove the endplate and cartilage. In unidirectional rotational resection, the central hollow 114 of the annular blade 110 facilitates the removal of tissue debris, and the annular cutting edge 113 formed by the intersection of the inclined surface 111 and the outer wall 112 of the blade 110 is relatively sharp, which effectively improves the efficiency of endplate and cartilage resection, greatly reduces the operation time, and reduces the potential risks caused by excessive operation time.

[0028] Please refer to Figures 2-5 The orthopedic surgical device of this application includes the aforementioned bone scalpel 100, and further includes a connecting assembly and an interface assembly. The connecting assembly includes a drive shaft 210 and an outer tube 220. The drive shaft 210 is connected to the handle 120. Specifically, one end of the drive shaft 210 has a blind insertion hole 211, and the handle 120 is inserted into the blind insertion hole 211 with an interference fit. The outer tube 220 is sleeved on the drive shaft 210, and the distal end of the outer tube 220 (the end furthest from the interface assembly) is at a certain distance from the blade 110, i.e., the distal end of the outer tube 220 does not contact the blade 110. The interface assembly includes a front outer shell 310 and a rear outer shell 320, which are connected. Specifically, the outer wall of the front outer shell 310 has an annular groove 311, and one end of the rear outer shell 320 has an annular snap 321, which is embedded in the annular groove 311. One end of the outer tube 220 is fixedly inserted into the front housing 310 and sealed with glue.

[0029] A first water flow channel 410 is provided between the drive shaft 210 and the outer tube 220. Water from the first water flow channel 410 is sprayed onto the blade 110 to cool and rinse the cutting position. The interface assembly has a second water flow channel 420, which is connected to an external water injection mechanism. The first water flow channel 410 and the second water flow channel 420 are connected.

[0030] Please refer to Figure 3 and Figure 4 A support tube 230 is sleeved on the drive shaft 210. The support tube 230 is eccentrically positioned to the drive shaft 210. One outer wall of the support tube 230 contacts the inner wall of the outer tube 220, and a gap exists between the other outer wall of the support tube 230 and the inner wall of the outer tube 220. This gap forms the first water flow channel 410. In this embodiment, the support tube 230 serves a supporting function between the drive shaft 210 and the outer tube 220. Furthermore, the eccentric positioning of the support tube 230 and the drive shaft 210 allows for a gap between one side of the support tube 230 and the outer tube 220, which is used as the first water flow channel 410.

[0031] Please refer to Figure 3 and Figure 5 The front housing 310 has a radially arranged water inlet hole 312, which is located inside the rear housing 320. The interior of the front housing 310 has a stepped hole 313, and there is a cavity between the outer wall of the drive shaft 210 and the inner wall of the stepped hole 313. The cavity forms a water injection cavity, which is connected to the first water flow channel 410 and the water inlet hole 312. The interior of the rear housing 320 is equipped with a water cooling jacket 330. The outer circumferential wall of the water cooling jacket 330 has a spiral channel 331. The spiral channel 331, the water inlet hole 312, and the water injection cavity are sequentially connected to form the second water flow channel 420.

[0032] One end of the water injection chamber is connected to the first water flow channel 410, while the other end needs to be sealed. Specifically, a sealing assembly is fitted inside the stepped hole 313 on the drive shaft 210. The sealing assembly is used to seal the water injection chamber. The sealing assembly includes a sealing tube 510 and a sealing sleeve 520. One end of the sealing sleeve 520 is inserted into the sealing tube 510, and the outer wall of the other end of the sealing sleeve 520 contacts the inner wall of the stepped hole 313 and is sealed with glue.

[0033] In order to enable the drive shaft 210 to rotate more stably inside the outer tube 220 and the interface assembly, a bearing 600 is fitted on the drive shaft 210 and the bearing 600 is fixed inside the sealing sleeve 520.

[0034] The aforementioned orthopedic surgical device connects the drive shaft 210 to an external motor. The rotation of the external motor drives the drive shaft 210 to rotate in one direction, which in turn drives the blade 110 to rotate in one direction to remove the endplate or cartilage. The annular blade 110 can effectively improve the efficiency of endplate and cartilage removal, greatly reduce the operation time, and reduce the potential risks caused by excessive operation time.

[0035] The aforementioned orthopedic surgical device injects water into the spiral channel 331 of the water-cooling jacket 330 through an external water injection mechanism. The injected water enters the water inlet 312 and the water injection chamber through the spiral channel 331, and then flows through the gap between the outer tube 220 and the support tube 230 and is sprayed out from the distal end of the outer tube 220 to cool the resection site and avoid secondary damage caused by the resection surgery.

[0036] The above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model. Technologies, shapes, and structural parts not described in detail in this utility model are all known technologies.

Claims

1. A bone cutter characterized by, The bone knife is used for cutting endplate or cartilage, and comprises a blade and a handle, wherein the blade and the handle are fixedly connected, the blade is a ring-shaped blade with a hollowed middle part, an inner wall of the blade forms an inclined surface which is inclined to the hollowed middle part, and the inclined surface and an outer side wall of the blade intersect to form a ring-shaped cutting edge.

2. The osteotome of claim 1, wherein, The ring-shaped cutting edge has two, and the two ring-shaped cutting edges are respectively located on opposite sides of the blade.

3. A device for use in orthopedic surgery, characterized in that The bone knife according to claim 1 or 2.

4. The device according to claim 3, wherein The device for orthopedic surgery further comprises a connecting assembly and an interface assembly, the connecting assembly comprises a transmission shaft and an outer tube, the transmission shaft is connected with the handle, and the outer tube is sleeved on the transmission shaft; the interface assembly comprises a front shell and a rear shell, the front shell and the rear shell are connected, and one end of the outer tube is fixedly inserted into the front shell.

5. The device according to claim 4, wherein The transmission shaft and the outer tube have a first water flow channel, and water sprayed from the first water flow channel sprays on the blade; the interface assembly has a second water flow channel, and the first water flow channel and the second water flow channel are communicated.

6. The device according to claim 5, wherein The transmission shaft is sleeved with a support tube, the support tube is eccentrically arranged with the transmission shaft, one side of an outer wall of the support tube is in contact with an inner wall of the outer tube, and a gap exists between the other side of the outer wall of the support tube and the inner wall of the outer tube, and the gap forms the first water flow channel.

7. The device according to claim 6, wherein The front shell has a water inlet hole arranged in a radial direction, an inner part of the front shell has a stepped hole, a cavity exists between an outer wall of the transmission shaft and an inner wall of the stepped hole, the cavity forms a water injection cavity, the water injection cavity is communicated with the first water flow channel and the water inlet hole, an inner part of the rear shell is provided with a water cooling jacket, an outer wall of the water cooling jacket has a spiral channel, the spiral channel, the water inlet hole and the water injection cavity are communicated to form the second water flow channel.

8. The device according to claim 7, characterized in that The transmission shaft is sleeved with a sealing assembly in the stepped hole, and the sealing assembly is used for encapsulating the water injection cavity.

9. The device according to claim 8, wherein The sealing assembly comprises a sealing tube and a sealing sleeve, one end of the sealing sleeve is inserted into the sealing tube, and an outer wall of the other end of the sealing sleeve is in contact with the inner wall of the stepped hole.

10. The device according to claim 9, wherein The transmission shaft is sleeved with a bearing, and the bearing is fixed in the sealing sleeve.

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