Water-cooling milling cutter for orthopedics department

Abstract

The utility model relates to the technical field of orthopedic surgical instruments, in particular to an orthopedic water-cooling milling cutter which comprises a milling cutter assembly, a sheath shell and a handle, the milling cutter assembly comprises a cutter body and a cutter handle, the cutter body comprises a cutter main body and double straight blades fixed on the periphery of the cutter main body, and the double straight blades comprise two cutting blade structures which are identical in structural shape. Each cutting edge structure comprises a side straight edge and a receding surface, the receding surface is a smooth arc-shaped surface, and the height difference between the circumference where the receding surface is located and the side straight edge is the same on any cross section in the axial direction of the cutter main body; the sheath shell comprises an outer tube and a sheath body which are connected with each other, a milling window is formed in the sheath body, the cutter body is located in the milling window, the cutter handle is arranged in the outer tube in a penetrating mode, a water injection channel is formed between the cutter handle and the outer tube, and an outlet of the water injection channel flows to the milling window; and the outer tube is fixedly inserted into the handle. The water-cooling milling cutter for the orthopedics department can be used for efficiently cutting over-thick sclerotin in cone slotting cutting.

Description

TECHNICAL FIELD

[0001] The utility model relates to orthopedic surgical instrument technical field especially relates to orthopedic water -cooling milling cutter. BACKGROUND

[0002] In the orthopedic or related surgical field such as spine surgery, neurosurgery, usually adopts bone milling cutter to mill cone plate, skull plate or other bone tissue, and the bone milling cutter usually includes handle and cutter bar installed on the handle, the cutter bar is provided with blade portion along the circumference in the front part, and the bone tissue is milled by the high-speed rotation of the cutter bar driven by the handle.

[0003] In the vertebral body resection surgery, it is necessary to first polish vertebral plate using a grinding drill bit, and the remaining thickness of the bone plate to the groove bottom needs to be less than 2mm, and then the remaining bone is removed using a manual vertebral plate rongeur to complete the surgery. If the remaining thickness is too thick after grinding, it is not conducive to using the manual rongeur, and the efficiency is low. SUMMARY

[0004] Therefore, the utility model discloses a kind of orthopedic water-cooling milling cutter, which can be used for the resection of thick bone in cone slotting, and realizes efficient resection.

[0005] The utility model solves the above-mentioned technical problems by the following technical means:

[0006] The orthopedic water-cooling milling cutter comprises:

[0007] The milling cutter assembly comprises a cutter body and a cutter handle fixedly connected, the cutter body comprises a cutter main body and double straight blades fixed on the outer periphery of the cutter main body, the double straight blades comprise two cutting blade structures with the same structure, the cutting blade structure comprises a side straight blade and a position avoiding surface, and the position avoiding surface is a smooth arc surface.

[0008] The sheath shell comprises an outer tube and a sheath body connected to each other, the sheath body has a milling window, the cutter body is located in the milling window, the cutter handle is arranged in the outer tube, and the cutter handle and the outer tube have a water injection passage therebetween, and the outlet of the water injection passage flows to the milling window.

[0009] The handle is fixedly inserted on the handle.

[0010] In some embodiments, the cutting blade structure further comprises a rake face and a relief face, the rake face is a flat surface, and the rake face is perpendicular to the cutter main body; and the intersection line between the relief face and the rake face forms the side straight blade.

[0011] In some embodiments, the position avoiding surface is connected to the relief face in a smooth transition.

[0012] In some embodiments, the angle between the flank face and the rake face is an acute angle, and the angle between the flank face and the clearance face is an obtuse angle.

[0013] In some embodiments, the radial dimension of the double straight blades formed on the outer periphery of the blade body gradually decreases from the end closer to the handle to the end farther from the handle.

[0014] In some embodiments, the two cutting edge structures are centrally symmetrical about the centerline of the blade body, and a chip removal groove is provided between the two cutting edge structures.

[0015] In some embodiments, the sheath includes a guard arm and a protective cap, one end of the guard arm being connected to the outer tube and the other end being connected to the protective cap, and a notch being formed on the guard arm between the protective cap and the outer tube, the notch forming a milled window.

[0016] In some embodiments, the outer tube has a water outlet hole that is connected to the water injection passage; the outer wall of the outer tube has a water inlet groove that is connected to the water outlet hole, and the water outlet of the water inlet groove passes through the outer wall of the outer tube and flows to the milling window.

[0017] In some embodiments, the outer tube has flat surfaces on opposite sides of its outer wall, the flat surfaces being close to the sheath.

[0018] In some embodiments, a water pipe is fitted onto the handle. The water pipe is an arc-shaped C-shaped pipe, and the gap formed between the water pipe fitted onto the handle and the outer pipe constitutes a water injection passage.

[0019] This utility model of an orthopedic water-cooled milling cutter features a double straight-edged design. On one hand, the unidirectional rotation of the cutter body allows for efficient bone removal and milling of thicker bone sections, including those requiring grooving. On the other hand, the smooth avoidance surface and side straight edges cause minimal damage to soft tissue, ensuring safe use. Placing the cutter body within the milling window allows for the milling removal of bone tissue within that window, protecting surrounding tissues from accidental injury. The water inlet channel flows to the milling window; during milling, cooling water is injected through the channel to cool the milling area, preventing thermal damage and ensuring safe use. This utility model of an orthopedic water-cooled milling cutter can replace manual laminectomy forceps for efficient removal of bone tissue in specific locations. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the orthopedic water-cooled milling cutter of this utility model;

[0021] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0022] Figure 3 This is a schematic diagram of the sheath shell structure;

[0023] Figure 4 This is a schematic diagram of the milling cutter assembly;

[0024] Figure 5 yes Figure 4 Left view of the middle milling cutter assembly;

[0025] The components include: milling cutter assembly 100, cutter body 110, cutter shank 120, side straight cutting edge 131, clearance surface 132, front cutting face 133, rear cutting face 134, sheath shell 200, outer tube 210, water outlet 211, water inlet groove 212, flat surface 213, milling window 221, guard arm 222, protective cap 223, handle 300, water inlet passage 410, chip removal groove 500, and water pipe 600. Detailed Implementation

[0026] 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.

[0027] 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.

[0028] Please refer to Figures 1-5 :

[0029] This utility model discloses an orthopedic water-cooled milling cutter for vertebral grooving resection. The cutter comprises a milling cutter assembly 100, a sheath shell 200, and a handle 300. The milling cutter assembly 100 includes a cutter body and a handle 120 fixedly connected. The cutter body includes a main body 110 and two straight cutting edges fixed to the outer periphery of the main body 110. The two straight cutting edges include two cutting edge structures with identical shapes. The cutting edge structure includes a side straight cutting edge 131 and a clearance surface 132, the clearance surface 132 being a smooth arc-shaped surface. The sheath shell 200 includes an outer tube 210 and a sheath body connected to each other. The sheath body has a milling window 221, the cutter body is located within the milling window 221, and the handle 120 passes through the outer tube 210. A water injection passage 410 is provided between the handle 120 and the outer tube 210, with the outlet of the water injection passage 410 flowing towards the milling window 221. The outer tube 210 is fixedly inserted into the handle 300.

[0030] In the milling cutter assembly 100, the shank 120 passes through the outer tube 210 and connects to the transmission component inside the handle 300. The transmission component is connected to the output shaft of the motor. The unidirectional rotation of the motor drives the shank 120 to rotate in one direction via the transmission component, which in turn causes the cutter body to rotate in one direction, thereby achieving milling and removal of bone tissue. The transmission component adopts a conventional transmission structure, such as a coupling or gear transmission structure. This utility model does not impose specific limitations, as long as the transmission between the motor and the shank 120 can be achieved. In use, the milling window is aligned with the bone to be milled, the cutter body contacts the bone to be milled, and the motor is turned on to drive the cutter body to rotate, thereby removing the bone within the milling window.

[0031] The side straight blade 131 in the cutting structure contacts the bone tissue for milling and removal. This embodiment of the orthopedic water-cooled milling cutter employs a double straight blade design. On one hand, the unidirectional rotation of the cutter body allows for efficient bone removal and milling to remove excessively thick bone through conical grooving. On the other hand, the smooth avoidance surface 132 and the side straight blade 131 cause almost no damage to soft tissue, ensuring safe use. The cross-section here refers to the surface perpendicular to the axial direction of the cutter body 110, and the circumference of the avoidance surface 132 is centered on the centerline of the cutter body 110. Placing the cutter body in the milling window 221 allows for milling and removal of bone tissue within the milling window 221, protecting surrounding tissues from accidental injury. The outlet of the water injection passage 410 flows to the milling window 221. During milling, cooling water is injected through the water injection passage 410 to cool the milling area and prevent thermal damage.

[0032] Please see Figure 4 and Figure 5The cutting edge structure also includes a front cutting face 133 and a rear cutting face 134. The front cutting face 133 is a straight surface and is perpendicular to the blade body 110. The intersection line between the rear cutting face 134 and the front cutting face 133 forms a side straight cutting edge 131. The clearance surface 132 is smoothly connected to the rear cutting face 134. The included angle between the rear cutting face 134 and the front cutting face 133 is an acute angle, and the included angle between the rear cutting face 134 and the clearance surface 132 is an obtuse angle. The two cutting edge structures are centrally symmetrical about the center line of the blade body 110, and a chip removal groove 500 is provided between the two cutting edge structures.

[0033] A rake face 133 is ground perpendicular to the tool body 110 using a grinding machine. Then, the tool body 110 is rotated 180° to grind another rake face 133 in the same manner. Next, the flank face 134 is machined by clamping the tool body 110 and rotating it back and forth 120°-160° to grind the flank face 134 and the tool clearance surface 132. During machining, the angle of rotation of the tool body 110 is limited to prevent damage to the opposite straight cutting edge 131. A right-angled notch is formed between the two cutting edge structures as a chip removal groove 500, with a right-angled cross-section. Using this machining method, the rake face 133, flank face 134, and clearance surface 132 can be stably machined, ensuring a relatively sharp side straight cutting edge 131 with almost no burrs. The difference in cutting edge between the two side straight cutting edges 131 can be less than 0.02mm.

[0034] The radial dimension of the double straight blades on the outer periphery of the blade body 110 gradually decreases from the end closer to the handle 120 to the end farther away from the handle 120. This creates a structure where the distal end is smaller and the proximal end is larger, resulting in an overall sloping design on the outer periphery of the blade.

[0035] Please see Figure 3 The sheath includes a guard arm 222 and a protective cap. One end of the guard arm 222 is connected to the outer tube 210, and the other end is connected to the protective cap 223. A notch is formed on the guard arm 222 between the protective cap 223 and the outer tube 210, forming a milling window 221. The protective cap 223 has a receiving groove on the side facing the tool body, and the end of the tool body away from the handle 120 is located in the receiving groove to protect the distal end of the tool body. The protective cap 223 can protect the tissue in front of the distal end of the tool body from injury, and the guard arm 222 can protect the tissue on the side of the tool body from injury.

[0036] The outer tube 210 has a water outlet 211, which is connected to the water injection passage 410. The outer wall of the outer tube 210 has a water inlet groove 212, the inlet end of which is connected to the water outlet 211. The outlet end of the water inlet groove 212 passes through the outer wall of the outer tube 210 and flows towards the milling window 221. To allow the cooling water in the water inlet groove 212 to flow more effectively towards the milling window, the water inlet groove 212 and the guard arm 222 are located on opposite sides of the tool holder 120. A water passage pipe 600 is fitted onto the tool holder 120. The water passage pipe 600 is an arc-shaped C-shaped pipe. The gap formed between the water passage pipe 600 and the outer tube 210 constitutes the water injection passage 410.

[0037] The handle 300 has a water injection channel similar to a water injection cavity or water injection pipe that is connected to the water injection passage 410 to inject water into the water injection passage 410. The injected cooling water flows through the water injection passage 410 and out of the water outlet 211, enters the water inlet trough 212, and flows through the water inlet trough 212 to the milling window 221 to cool down the milling position and avoid thermal damage.

[0038] To facilitate better access of the distal end of the orthopedic water-cooled end mill to the conical slot (the milling position), flat surfaces 213 are provided on the opposite outer walls of the outer tube 210. These flat surfaces 213 are located near the sheath, and are situated on opposite sides of the water inlet groove 212. The placement of flat surfaces 213 on opposite sides of the outer tube near the sheath creates a non-cylindrical structure, providing clearance on both sides of the outer tube 210 near the sheath. This allows the distal end of the orthopedic water-cooled end mill to enter narrow slit spaces for milling operations.

[0039] 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. An orthopedic water-cooled milling cutter characterized by, The application relates to a milling cutter assembly. The milling cutter assembly comprises a fixedly connected cutter body and a cutter handle, the cutter body comprises a cutter main body and double straight blades fixed on the outer periphery of the cutter main body, the double straight blades comprise two cutting blade structures which are completely identical in structure, the cutting blade structure comprises a side straight blade and a relief surface, and the relief surface is a smooth arc surface. The sheath shell comprises an outer tube and a sheath body which are connected with each other, the sheath body is provided with a milling window, the cutter body is located in the milling window, the cutter handle is arranged in the outer tube, and a water injection channel is arranged between the cutter handle and the outer tube, and the outlet of the water injection channel flows to the milling window. The outer tube is fixedly inserted into a handle.

2. The orthopedic water-cooled milling tool of claim 1, wherein, The cutting blade structure further comprises a rake face and a relief face, the rake face is a flat surface, and the rake face is perpendicular to the cutter main body; and the intersection line between the relief face and the rake face forms the side straight blade.

3. The orthopedic water-cooled milling tool of claim 2, wherein, The relief surface is connected with the relief face in a smooth transition mode.

4. The orthopedic water-cooled milling tool of claim 3, wherein, The included angle between the relief face and the rake face is an acute angle, and the included angle between the relief face and the relief surface is an obtuse angle.

5. The orthopedic water-cooled milling tool according to any one of claims 1-4, characterized in that, The radial dimension of the double straight blades gradually decreases from one end close to the cutter handle to the other end far away from the cutter handle.

6. The orthopedic water-cooled milling tool of claim 1, wherein, The two cutting blade structures are in a central symmetrical relationship with the center line of the cutter main body, and the two cutting blade structures are provided with a chip removal groove.

7. The orthopedic water-cooled milling tool of claim 1, wherein, The sheath body comprises an arm and a protection cap, one end of the arm is connected with the outer tube, the other end of the arm is connected with the protection cap, a gap is formed on the arm between the protection cap and the outer tube, and the gap forms the milling window.

8. The orthopedic water-cooled milling tool of claim 1, wherein, The outer tube is provided with a water outlet hole which is communicated with the water injection channel; the outer tube is provided with a water guide groove on the outer wall, the water inlet end of the water guide groove is communicated with the water outlet hole, and the water outlet end of the water guide groove penetrates through the outer wall of the outer tube and flows to the milling window.

9. The orthopedic water-cooled milling tool of claim 1, wherein, The outer tube is provided with flat surfaces on the opposite two outer walls, and the flat surfaces are close to the sheath body.

10. The orthopedic water-cooled milling tool of claim 1, wherein, The cutter handle is provided with a water passing pipe, the water passing pipe is a C-shaped pipe in an arc shape, and the water passing pipe is arranged on the cutter handle to form the water injection channel in the gap between the cutter handle and the outer tube.

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