Sheath assembly for bone milling cutter and bone milling cutter

Abstract

The utility model relates to the technical field of medical instruments, in particular to a sheath assembly for a bone milling cutter and the bone milling cutter, the sheath assembly comprises a sheath, an inner connecting pipe, an inserting piece assembly and a driving assembly, and the inner connecting pipe is used for connecting the sheath; the insertion piece assembly is installed between the inner connecting pipe and the sheath and used for limiting circumferential rotation of the sheath. The driving assembly is used for driving the inserting piece assembly to slide on the inner connecting pipe to form an avoiding space for circumferential rotation of the protective sheath so that the protective sheath can be detached conveniently, and the driving assembly is installed on the inner connecting pipe. The bone milling cutter comprises the sheath assembly. According to the sheath assembly and the bone milling cutter, the buckle can be pulled out by shifting the shifting piece and rotating the sheath, so that the sheath is detached, the sheath is convenient to clean, the sheath is simple in structure and small in cleaning blind area, tissues, blood and the like left on the sheath can be completely cleaned as far as possible, bacterium breeding is avoided, and use safety and sanitation are guaranteed. And the operation is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of medical instruments, in particular to a sheath component for a bone milling cutter and a bone milling cutter. Background Art

[0002] In the field of orthopedics or related surgical operations such as spinal surgery and neurosurgery, a bone milling cutter is usually used to mill vertebral plates, skull plates or other bone tissues. The bone milling cutter usually includes a handle and a tool rod mounted on the handle. A blade is circumferentially arranged at the front of the tool rod. The handle drives the tool rod to rotate at high speed to mill bone tissue.

[0003] Chinese Patent 2022213445179 discloses a sheath and surgical instrument for a bone milling cutter, comprising a sheath body connected to a handle, and a protective cap connected to the sheath body through a guard arm, the protective cap being provided with a receiving groove for accommodating the front end of the bone milling cutter and limiting the radial movement range of the front end of the bone milling cutter, the receiving groove being a semi-closed structure, and the inner wall of the receiving groove being a rotating surface structure, the protective cap being provided with the same can, on the one hand, separate the front end of the milling cutter from the tissue, thereby protecting the tissue and nerves, and on the other hand, limiting the radial movement range of the front end of the milling cutter through the inner wall of the receiving groove, thereby preventing the slender milling cutter from swinging significantly when rotating at high speed, and supporting the side of the front end of the milling cutter radially through the inner wall of the receiving groove, thereby providing a radial support force to the front end of the slender milling cutter, thereby preventing the milling cutter from being completely broken during operation.

[0004] After the milling cutter is used, a lot of tissue or blood will remain in the sheath, especially at the interface between the sheath and the handle. If the sheath is not disassembled and cleaned, the tissue or blood left for a long time will breed bacteria and affect subsequent use. The sheath in the above patent is not convenient to disassemble, resulting in incomplete cleaning. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide a sheath assembly and a bone milling cutter for a bone milling cutter, wherein the sheath assembly has a simple structure and the sheath is easy to disassemble. After use, the sheath can be disassembled and thoroughly cleaned to avoid bacterial growth.

[0006] The utility model solves the above technical problems through the following technical means:

[0007] In a first aspect, the utility model provides a sheath assembly for a bone milling cutter, comprising a sheath, and further comprising:

[0008] An internal pipe, used for connecting the sheath;

[0009] The insert assembly is installed between the inner tube and the sheath to limit the circumferential rotation of the sheath;

[0010] The driving assembly is used to drive the inserting piece assembly to slide on the inner tube to form an escape space for the circumferential rotation of the sheath so as to disassemble the sheath. The driving assembly is installed on the inner tube.

[0011] In combination with the first aspect, in some embodiments, the end of the inner tube close to the sheath has an avoidance groove and a card slot, the avoidance groove is communicated with the card slot, the connecting part of the sheath close to the inner tube has a buckle adapted to the card slot, and when the sheath is connected to the inner tube, the buckle is locked in the card slot.

[0012] In combination with the first aspect, in some embodiments, the insert assembly includes a retaining ring and an insert, the insert is slidably arranged in the avoidance groove, the insert slides to the slot position to limit the circumferential rotation of the buckle, and the insert assembly slides in a direction away from the sheath to form an avoidance space for the circumferential rotation of the buckle.

[0013] In combination with the first aspect, in some embodiments, the drive assembly includes a sleeve, a spring and a paddle, the sleeve is slidably mounted on the inner tube, a buckle is provided on the inner wall of one end of the sleeve, the retaining ring is located on the inner side of the buckle, the spring is mounted on the inner tube and located inside the sleeve, and the paddle is fixedly mounted on the outer wall of the other end of the sleeve.

[0014] In combination with the first aspect, in some embodiments, the sheath assembly further includes a first shell and a second shell, the first shell being sleeved on the outer wall of the sleeve and one end of the inner tube, the second shell being sleeved on the first shell, and the paddle being slidably installed between the first shell and the second shell.

[0015] In combination with the first aspect, in some embodiments, the first shell and the second shell both have notches at positions corresponding to the paddle, the paddle is located in the notches, and the second shell has a sliding groove for the paddle to slide.

[0016] In a second aspect, the utility model provides a bone milling cutter, comprising the sheath assembly described in the first aspect, and a tool assembly, wherein the tool assembly is inserted into the sheath assembly.

[0017] In combination with the second aspect, in some embodiments, the tool assembly includes a tool rod and a toothed blade, wherein the toothed blade is disposed at a distal end of the tool rod and arranged along the circumference of the tool rod, and the toothed blade corresponds to a position of the sheath.

[0018] In combination with the second aspect, in some embodiments, a bearing sleeve is provided on the tool rod, the bearing sleeve is located inside the inner tube, two bearings are installed between the bearing sleeve and the tool rod, and the two bearings are respectively located at opposite ends of the bearing sleeve.

[0019] In combination with the second aspect, in some embodiments, a bearing stop tube is sleeved on the outer wall of one end of the bearing sleeve close to the sheath, and the bearing close to the tooth blade is located on the inner side of the bearing stop tube.

[0020] The sheath assembly for the bone milling cutter of the utility model can pull out the buckle by turning the paddle and rotating the sheath, thereby realizing the disassembly of the sheath, so as to facilitate the cleaning of the sheath. The sheath has a simple structure and fewer blind spots for cleaning, and can clean the tissue and blood left on the sheath as completely as possible to avoid bacterial growth, thereby ensuring safe and hygienic use and convenient operation. The sheath assembly of the utility model is applied to the bone milling cutter, and the sheath can be quickly and conveniently removed for cleaning after the operation. Before the operation, the dry and disinfected sheath can be assembled on the internal pipe for surgical operation, thereby ensuring the safety and sanitation of surgical instruments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of the exploded structure of the sheath assembly for the bone milling cutter of Example 1;

[0022] Figure 2 is a schematic structural diagram of a sheath assembly for a bone milling cutter according to Example 1;

[0023] Figure 3 is a cross-sectional view of a sheath assembly for a bone milling cutter of Example 1;

[0024] Figure 4 It is a schematic diagram of the enlarged structure of the internal pipe;

[0025] Figure 5 is an enlarged structural schematic diagram of the first shell;

[0026] Figure 6 is a cross-sectional view of the bone milling cutter of Example 2;

[0027] Figure 7 yes Figure 6 A schematic diagram of the enlarged structure at A in the middle;

[0028] Among them, the sheath 100, the protective cap 110, the sheath body 120, the connecting part 130, the buckle 140, the inner tube 200, the avoidance groove 211, the slot 212, the retaining wall 220, the first step wall 230, the second step wall 240, the connecting groove 250, the insert assembly 300, the retaining ring 310, the insert 320, the sleeve 410, the buckle 411, the spring 420, the paddle 430, the first shell 510, the second shell 520, the notch 530, the slide groove 540, the third shell 550, the connecting ring 551, the tool rod 610, the tooth blade 620, the bearing sleeve 710, the bearing 720, the bearing retaining tube 730, and the tool interface 800. DETAILED DESCRIPTION

[0029] The following describes the implementation of the present invention through specific embodiments. Those skilled in the art can understand the advantages and effects of the present invention from the contents disclosed in this specification. It should be noted that the illustrations provided in the following embodiments are only for exemplary descriptions, and they are only schematic diagrams, not physical diagrams, and cannot be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts in the figures may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the figures may be omitted.

[0030] The same or similar numbers in the figures of the embodiments of the present invention correspond to the same or similar parts. In the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "back", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the figures, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the figures are only used for illustrative purposes and cannot be understood as limitations on the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0031] Example 1

[0032] Please refer to Figure 1-5 The sheath assembly for the bone milling cutter of this embodiment includes a sheath 100, an inner tube 200, an insert assembly 300, and a drive assembly. The inner tube 200 is used to connect the sheath 100. The inner tube 200 is hollow inside for the tool rod of the bone milling cutter to pass through. The insert assembly 300 is installed between the inner tube 200 and the sheath 100 to limit the circumferential rotation of the sheath 100. The drive assembly is used to drive the insert assembly 300 to slide on the inner tube 200 to form an avoidance space for the circumferential rotation of the sheath 100 so as to disassemble the sheath 100. The drive assembly is installed on the inner tube 200.

[0033] Specifically, the end of the inner tube 200 close to the sheath 100 has an avoidance groove 211 and a clamping groove 212, and the avoidance groove 211 is communicated with the clamping groove 212. Preferably, there are two avoidance grooves 211 and two clamping grooves 212, and the two avoidance grooves 211 are opposite to each other, and the two clamping grooves 212 are opposite to each other. The sheath 100 includes a protective cap 110, a sheath body 120 and a connecting portion 130 connected in sequence. The connecting portion 130 has a buckle 140 adapted to the clamping groove 212 on the side facing the inner tube 200. When the sheath 100 is connected to the inner tube 200, the buckle 140 is clamped in the clamping groove 212. When the sheath 100 needs to be disassembled, the sheath 100 is rotated to make the buckle 140 disengage from the clamping groove 212 and enter the avoidance groove 211, and then slide out from the avoidance groove 211, so that the sheath 100 can be disassembled.

[0034] In order to make the connection between the sheath 100 and the inner tube 200 more stable, an insert assembly 300 is installed between the inner tube 200 and the sheath 100. The insert assembly 300 includes a retaining ring 310 and an insert 320. The insert 320 is slidably arranged in the avoidance groove 211. The length of the insert 320 is less than the length of the avoidance groove 211. When the insert 320 slides to the end of the avoidance groove 211 away from the sheath 100, the insert 320 completely avoids the slot 212, forming an avoidance space for the circumferential rotation of the buckle 140. When the sheath 100 is rotated, the buckle 140 moves circumferentially to disengage from the slot 212 and enter the avoidance groove 211, thereby sliding out of the avoidance groove 211. When the insert 320 slides to the position of the slot 212, the insert 320 can limit the circumferential rotation of the buckle 140, thereby achieving a stable connection between the sheath 100 and the inner tube 200.

[0035] The driving assembly includes a sleeve 410, a spring 420 and a paddle 430. The sleeve 410 is slidably mounted on the inner tube 200. A buckle 411 is provided on the inner wall of one end of the sleeve 410. The retaining ring 310 is located inside the buckle 411 and inside the sleeve 410. The spring 420 is mounted on the inner tube 200 and inside the sleeve 410. A retaining wall 220 is provided on the outer wall of the inner tube 200. A spring installation cavity is formed between the retaining wall 220, the sleeve 410, the retaining ring 310 and the outer wall of the inner tube 200. The spring 420 is located inside the spring installation cavity. The paddle 430 is fixedly mounted on the outer wall of the other end of the sleeve 410. In order to better drive the sleeve 410 to slide, two paddles 430 are provided, and the positions of the two paddles 430 are opposite.

[0036] When the sheath 100 needs to be removed, the paddle 430 is pulled in the direction away from the sheath 100. The sliding of the paddle 430 drives the sleeve 410 to slide. The sliding of the sleeve 410 drives the insert assembly 300 to slide and compress the spring 420. At this time, the insert 320 slides in the avoidance groove 211 in the direction away from the sheath 100 until the outside of the slot 212 is completely unblocked. The sheath 100 is rotated to make the buckle 140 disengage from the slot 212 and slide out of the avoidance groove 211. The sheath 100 can be removed, the paddle 430 is released, and the insert assembly 300 is reset under the action of the spring 420. Similarly, when the sheath needs to be installed, pull the paddle 430 to make the outside of the slot 212 completely unblocked so that the buckle 140 on the sheath 100 can be inserted into the avoidance groove 211, rotate the sheath 100 to make the buckle 140 stuck in the slot 212, release the paddle 430, and under the action of the spring 420, the insert assembly 300 is reset, and the insert 320 restricts the buckle 140 in the slot 212, thereby achieving a stable connection between the sheath 100 and the inner tube 200.

[0037] The sheath 100 assembly further includes a first shell 510 and a second shell 520. The first shell 510 is sleeved on the outer wall of the sleeve 410 and one end of the inner tube 200. The second shell 520 is sleeved on the first shell 510. The paddle 430 is slidably installed between the first shell 510 and the second shell 520. The first shell 510 and the second shell 520 both have a notch 530 corresponding to the position of the paddle 430. The paddle 430 is located in the notch 530. The second shell 520 has a slide groove 540 for the paddle 430 to slide. Specifically, the outer wall of the inner tube 200 has a first step wall 230 and a second step wall 240. The first step wall 230 is used to limit the excessive sliding of the sleeve 410. The second shell 520 is fixedly installed on the second step wall 240.

[0038] Example 2

[0039] Please refer to Figure 6-7 The bone milling cutter of this embodiment includes the sheath assembly and the tool assembly of embodiment 1, and the tool assembly is inserted into the sheath assembly.

[0040] Specifically, the tool assembly includes a knife bar 610 and a toothed blade 620. The toothed blade 620 is disposed at the distal end of the knife bar 610 and arranged circumferentially along the knife bar 610. The toothed blade 620 corresponds to the position of the sheath 100. Here, the distal end of the knife bar 610 refers to the end away from the hand, and the proximal end refers to the end close to the hand. The knife bar 610 passes through the connecting portion 130 of the sheath 100, and its distal end is located in the protective cap 110, and the position of the toothed blade 620 is opposite to the position of the sheath body 120. The proximal end of the knife bar 610 is connected to an external power mechanism, and the external power mechanism can be, for example, a structure such as a motor that can drive the knife bar to rotate.

[0041] In order to make the knife rod 610 rotate more stably, a bearing sleeve 710 is sleeved on the knife rod 610. The bearing sleeve 710 is located inside the inner tube 200. Two bearings 720 are installed between the bearing sleeve 710 and the knife rod 610. The two bearings 720 are respectively located at opposite ends of the bearing sleeve 710. A bearing stop tube 730 is sleeved on the outer wall of the end of the bearing sleeve 710 close to the sheath 100, and the bearing 720 close to the tooth blade 620 is located inside the bearing stop tube 730.

[0042] A third housing 550 is also installed on the end of the inner tube 200 away from the sheath 100. Specifically, a connection groove 250 is also provided on the outer wall of the inner tube 200. A connection ring 551 is provided on the inner wall of the third housing 550. The connection ring 551 is embedded in the connection groove 250 and sealed with glue. A tool interface 800 is provided in the third housing 550. The tool rod 610 is inserted into the tool interface 800. One end of the tool interface 800 is plugged into the inner tube 200.

[0043] The bone milling cutter of the utility model can pull out the buckle 140 by turning the paddle 430 and rotating the sheath 100, thereby realizing disassembly of the sheath 100, so as to facilitate cleaning of the sheath 100. Moreover, the sheath 100 has a simple structure and fewer blind spots for cleaning, and can clean the tissue and blood remaining on the sheath 100 as completely as possible, thereby avoiding bacterial growth and ensuring safe and hygienic use.

[0044] The above embodiments are only used to illustrate the technical solution of the utility model and are not intended to limit it. Although the utility model is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model. The technology, shape, and structure that are not described in detail in the utility model are all well-known technologies.

Claims

1. A sheath assembly for a bone milling cutter, comprising a sheath, characterized in that: Also includes: An internal pipe, used for connecting the sheath; The insert assembly is installed between the inner tube and the sheath to limit the circumferential rotation of the sheath; The driving assembly is used to drive the inserting piece assembly to slide on the inner tube to form an escape space for the circumferential rotation of the sheath so as to disassemble the sheath. The driving assembly is installed on the inner tube.

2. The sheath assembly for a bone milling cutter according to claim 1, characterized in that: The end of the inner tube close to the sheath has an avoidance groove and a clamping groove, the avoidance groove is communicated with the clamping groove, the connecting part of the sheath close to the inner tube has a buckle adapted to the clamping groove, and when the sheath is connected to the inner tube, the buckle is clamped in the clamping groove.

3. The sheath assembly for a bone milling cutter according to claim 2, characterized in that: The insert assembly includes a retaining ring and an insert, the insert is slidably arranged in the avoidance groove, the insert slides to the position of the slot to limit the circumferential rotation of the buckle, and the insert assembly slides in a direction away from the sheath to form an avoidance space for the circumferential rotation of the buckle.

4. The sheath assembly for a bone milling cutter according to claim 3, characterized in that: The driving assembly includes a sleeve, a spring and a paddle. The sleeve is slidably mounted on the inner tube. A buckle is provided on the inner wall of one end of the sleeve. The retaining ring is located inside the buckle. The spring is mounted on the inner tube and inside the sleeve. The paddle is fixedly mounted on the outer wall of the other end of the sleeve.

5. The sheath assembly for a bone milling cutter according to claim 4, characterized in that: The sheath assembly further comprises a first shell and a second shell, wherein the first shell is sleeved on the outer wall of the sleeve and one end of the inner tube, the second shell is sleeved on the first shell, and the paddle is slidably mounted between the first shell and the second shell.

6. The sheath assembly for a bone milling cutter according to claim 5, characterized in that: The first shell and the second shell both have notches at positions corresponding to the paddle, the paddle is located in the notches, and the second shell has a sliding groove for the paddle to slide.

7. A bone milling cutter, characterized in that: It comprises a sheath assembly as described in any one of claims 1 to 6, and a cutter assembly, wherein the cutter assembly is inserted into the sheath assembly.

8. The bone milling cutter according to claim 7, characterized in that: The tool assembly comprises a tool rod and a toothed blade, wherein the toothed blade is arranged at the distal end of the tool rod and along the circumference of the tool rod, and the toothed blade corresponds to the position of the sheath.

9. The bone milling cutter according to claim 8, characterized in that: A bearing sleeve is sleeved on the knife rod, and the bearing sleeve is located inside the inner pipe. Two bearings are installed between the bearing sleeve and the knife rod, and the two bearings are respectively located at opposite ends of the bearing sleeve.

10. The bone milling cutter according to claim 9, characterized in that: A bearing stop tube is sleeved on the outer wall of one end of the bearing sleeve close to the sheath, and the bearing close to the tooth blade is located on the inner side of the bearing stop tube.

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