Knife breaking prevention mechanism and milling cutter assembly for craniotomy

Abstract

The invention relates to the field of medical apparatus and instruments, and discloses a knife-breaking-preventing mechanism which comprises a limiting sleeve and a top sleeve, the limiting sleeve is detachably connected with a skull milling cutter, and when the knife-breaking-preventing mechanism is connected with the skull milling cutter, the top sleeve is matched with a milling cutter hook to clamp the two sides of a skull; the end, abutting against the skull, of the ejector sleeve is perpendicular to the axis of the skull milling cutter, so that the axis of the skull milling cutter can be always kept to be approximately perpendicular to the skull, the cutter breaking phenomenon is prevented to the maximum extent, the problem that the dura mater is damaged is effectively avoided, and the safety coefficient of the skull milling cutter is improved. The top sleeve can slide relative to the limiting sleeve, so that it is ensured that the top sleeve can abut against the outer wall of the head, and the reliability of the knife breaking prevention mechanism is improved. The invention further provides a craniotomy milling cutter assembly which comprises the skull milling cutter, the milling cutter hook and the cutter breaking prevention mechanism, and the operation safety coefficient of the craniotomy milling cutter assembly can be effectively improved through the cutter breaking prevention mechanism.

Description

Technical Field

[0001] The present invention relates to the technical field of medical equipment and peripheral supporting facilities thereof, in particular to a knife-breaking prevention mechanism and a milling cutter assembly for craniotomy. Background Art

[0002] A craniotomy cutter is a specialized medical device used for precise cutting and removal of the skull during neurosurgery. It uses a high-speed rotating cutter to precisely cut the skull. Most craniotomy cutters on the market are made of high-speed steel and carbon steel, which are hard, brittle, and easily breakable.

[0003] During the skull milling process of neurosurgery craniotomy, the skull milling cutter often breaks due to the different operating techniques and judgment of the surgeon during the bone milling process, causing certain economic losses and easily colliding with the dura mater, causing damage to it, reducing the safety factor of the craniotomy cutter. Summary of the Invention

[0004] The purpose of the present invention is to provide an anti-breakage mechanism and a milling cutter assembly for craniotomy to solve the problems existing in the above-mentioned related technologies, so that the skull milling cutter and the skull remain in a nearly vertical state, thereby avoiding the occurrence of breakage to the greatest extent, and at the same time avoiding damage to the dura mater caused by breakage during surgery, thereby improving the safety factor of the milling cutter assembly for craniotomy.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides a knife-breaking prevention mechanism, comprising:

[0007] A limiting sleeve, which can be detachably connected to the tool housing of the cranial milling cutter;

[0008] A top sleeve, one end of which is slidably connected to the limiting sleeve, and the other end of which can be abutted against the outer wall of the skull; the end of the top sleeve abutting against the outer wall of the skull cooperates with the curved hook of the milling cutter to clamp the skull, and the end of the top sleeve abutting against the outer wall of the skull is perpendicular to the feed direction of the cutter head of the skull milling cutter.

[0009] Preferably, the limiting sleeve is a cylindrical structure, one end of the top sleeve can be slidably extended into the limiting sleeve and an elastic element is provided between the two.

[0010] Preferably, the elastic element is a spring, and the elastic element is sleeved on the outside of the skull milling cutter.

[0011] Preferably, the top sleeve includes a connecting tube and a pressing block, the connecting tube is slidably connected to the limit sleeve, and the end of the connecting tube away from the limit sleeve is connected to the pressing block. Under the elastic force of the elastic element, the pressing block can be pressed on the outer wall of the skull, and the pressing block is perpendicular to the axial direction of the skull milling cutter.

[0012] Preferably, the pressing block includes two parallel support plates, and the cutter head of the skull milling cutter can pass through the gap between the two support plates.

[0013] Preferably, the pressing block is a U-shaped structure, and further comprises an intermediate connecting plate, which connects one end of the two support plates and is connected to the connecting tube.

[0014] Preferably, a retaining ring is provided between the connecting tube and the limiting sleeve to limit the extreme positions of the connecting tube and the limiting sleeve.

[0015] The present invention also provides a milling cutter assembly for craniotomy, comprising a skull milling cutter and a milling cutter hook, wherein the skull milling cutter is detachably connected to the milling cutter hook, and further comprising the above-mentioned anti-breakage mechanism, wherein the limiting sleeve is detachably connected to the tool housing of the skull milling cutter, the hook portion of the milling cutter hook can abut against the outer wall of the skull, and the top sleeve cooperates with the milling cutter hook to clamp the skull.

[0016] Preferably, the limiting sleeve is threadedly connected to the tool housing of the skull milling cutter.

[0017] Preferably, the milling cutter hook passes through the top sleeve and is connected to the skull milling cutter.

[0018] Compared with the related art, the present invention has achieved the following technical effects: the anti-breakage knife mechanism of the present invention includes a limit sleeve and a top sleeve, wherein the limit sleeve can be detachably connected to the tool housing of the skull milling cutter; one end of the top sleeve is slidably connected to the limit sleeve, and the other end of the top sleeve can be abutted against the outer wall of the skull; the end of the top sleeve abutting against the outer wall of the skull cooperates with the milling cutter hook to clamp the skull, and the end of the top sleeve abutting against the outer wall of the skull is perpendicular to the feed direction of the tool head of the skull milling cutter.

[0019] The anti-breakage mechanism of the present invention utilizes a limit sleeve to be detachably connected to the skull milling cutter. When the anti-breakage mechanism of the present invention is connected to the skull milling cutter, the top sleeve cooperates with the milling cutter hook to clamp both sides of the skull, and the end of the top sleeve that abuts the skull is perpendicular to the axis of the skull milling cutter, so that the axis of the skull milling cutter can always remain roughly perpendicular to the skull, thereby preventing the occurrence of blade breakage to the greatest extent, effectively avoiding the problem of damage to the dura mater, and improving the safety factor of the skull milling cutter. The top sleeve of the present invention can slide relative to the limit sleeve, thereby ensuring that the top sleeve can be tightly pressed against the outer wall of the skull, improving the reliability of the anti-breakage mechanism.

[0020] The present invention also provides a milling cutter assembly for craniotomy, including a skull milling cutter, a milling cutter hook, and the above-mentioned anti-breakage mechanism. The anti-breakage mechanism and the milling cutter hook are respectively detachably connected to the skull milling cutter. The use of the anti-breakage mechanism can effectively improve the operational safety factor of the milling cutter assembly for craniotomy. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 This is an axonometric diagram of a craniotomy milling cutter assembly disclosed in an embodiment of the present invention;

[0023] Figure 2 A schematic front view of a craniotomy milling cutter assembly disclosed in an embodiment of the present invention;

[0024] Figure 3 A side view schematic diagram of a craniotomy milling cutter assembly disclosed in an embodiment of the present invention;

[0025] Figure 4 The working diagram of the milling cutter assembly for craniotomy disclosed in the embodiment of the present invention is as follows Figure 1 ;

[0026] Figure 5 The working diagram of the milling cutter assembly for craniotomy disclosed in the embodiment of the present invention is as follows Figure 2 ;

[0027] Figure 6 The working diagram of the milling cutter assembly for craniotomy disclosed in the embodiment of the present invention is as follows Figure 3 .

[0028] In the figure: 1. Limit sleeve; 2. Top sleeve; 3. Head milling cutter; 301. Tool head; 302. Tool handle; 303. Tool shaft; 304. Tool housing; 4. Milling cutter hook; 5. Elastic element; 6. Connecting cylinder; 7. Pressing block; 8. Support plate; 9. Intermediate connecting plate; 10. Retaining ring; 11. Skull; 12. Dura mater. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] The purpose of the present invention is to provide an anti-breakage mechanism and a milling cutter assembly for craniotomy to solve the problems existing in the above-mentioned related technologies, so that the skull milling cutter and the skull remain in a nearly vertical state, thereby avoiding the occurrence of breakage to the greatest extent, and at the same time avoiding damage to the dura mater caused by breakage during surgery, thereby improving the safety factor of the milling cutter assembly for craniotomy.

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] Example 1

[0033] This embodiment provides a knife-breaking prevention mechanism. Figures 1-6 , including a limit sleeve 1 and a top sleeve 2, wherein the limit sleeve 1 can be detachably connected to the tool housing 304 of the skull milling cutter 3; one end of the top sleeve 2 is slidably connected to the limit sleeve 1, and the other end of the top sleeve 2 can be abutted against the outer wall of the skull 11; the end of the top sleeve 2 abutting against the outer wall of the skull 11 cooperates with the milling cutter hook 4 to clamp the skull 11, and the end of the top sleeve 2 abutting against the outer wall of the skull 11 is perpendicular to the tool head feed direction of the skull milling cutter 3.

[0034] The anti-breakage knife mechanism of the present invention utilizes a limit sleeve 1 to be detachably connected to the skull milling cutter 3. When the anti-breakage knife mechanism of the present invention is connected to the skull milling cutter 3, the top sleeve 2 cooperates with the milling cutter hook 4 to clamp both sides of the skull 11, and the end of the top sleeve 2 that abuts the skull 11 is perpendicular to the axis of the skull milling cutter 3, so that the axis of the skull milling cutter 3 can always remain roughly perpendicular to the skull 11, thereby preventing the occurrence of knife breakage to the greatest extent, effectively avoiding the problem of damage to the dura mater 12, and improving the safety factor of the skull milling cutter 3. The top sleeve 2 of the present invention can slide relative to the limit sleeve 1, thereby ensuring that the top sleeve 2 can be tightly pressed against the outer wall of the skull, improving the reliability of the anti-breakage knife mechanism.

[0035] It needs to be explained here that the present invention mentions that the axis of the skull milling cutter 3 is kept roughly perpendicular to the skull 11. Since the shape of the skull 11 is irregular, the contact area between the top sleeve 2 and the skull 11 is small. The end of the top sleeve 2 that abuts the skull 11 is perpendicular to the axis of the skull milling cutter 3, so that the contact surface between the top sleeve 2 and the skull 11 is roughly perpendicular to the axis of the milling skull milling cutter 3, thereby ensuring the smooth operation of the skull milling cutter 3. Roughly perpendicular specifically refers to an angle within a certain error range based on 90°.

[0036] Among them, the limiting sleeve 1 is a cylindrical structure, one end of the top sleeve 2 can be slidably extended into the limiting sleeve 1 and an elastic element 5 is arranged between the two. Under the elastic force of the elastic element 5, the top sleeve 2 always presses against the skull 11, further ensuring the stability and reliability of the top sleeve 2 and the milling cutter hook 4 clamping the skull 11.

[0037] In this specific embodiment, the elastic element 5 is a spring, which is cheap and easy to obtain. The elastic element 5 is sleeved on the outside of the skull milling cutter 3, and is convenient to disassemble and assemble and easy to replace.

[0038] Specifically, the top sleeve 2 includes a connecting tube 6 and a pressing block 7. The connecting tube 6 is slidably connected to the limiting sleeve 1. The elastic element 5 is disposed between the connecting tube 6 and the limiting sleeve 1. The end of the connecting tube 6 away from the limiting sleeve 1 is connected to the pressing block 7. Under the elastic force of the elastic element 5, the pressing block 7 can always be pressed against the outer wall of the skull 11. The pressing block 7 is perpendicular to the axial direction of the skull milling cutter 3. The top sleeve 2 includes a connecting tube 6 and a pressing block 7. The connecting tube 6 ensures the smooth sliding connection between the top sleeve 2 and the limiting sleeve 1. At the same time, the pressing block 7 is used to abut against the skull 11, ensuring the structural stability of the anti-breakage mechanism.

[0039] In this specific embodiment, the clamping block 7 includes two parallel support plates 8, and the cutter head of the skull milling cutter 3 can pass through the gap between the two support plates 8. The two support plates 8 are arranged to contact the skull 11, which increases the contact area between the clamping block 7 and the skull 11 and improves the stability of the clamping block 7 against the skull 11. The area where the skull milling cutter 3 performs drilling and milling work is located between the two support plates 8. While pressing against the skull 11, the force uniformity of the skull 11 around the working area is improved, which is conducive to further improving the operational safety factor.

[0040] More specifically, the clamping block 7 is a U-shaped structure, and the clamping block 7 also includes an intermediate connecting plate 9, which connects one end of the two support plates 8 and is connected to the connecting tube 6. The clamping block 7 adopts a U-shaped structure. While ensuring that the clamping block 7 stably clamps the skull 11, it also ensures the stability of the connection between the clamping block 7 and the connecting tube 6, ensures the smoothness and reliability of the movement of the top sleeve 2, and thereby improves the reliability of the anti-breakage knife mechanism. The intermediate connecting plate 9 is located at one end of the two support plates 8 to avoid affecting the drilling and milling work of the cutter head of the skull milling cutter 3.

[0041] It should also be noted that a retaining ring 10 is provided between the connecting tube 6 and the limiting sleeve 1 to limit the extreme positions of the connecting tube 6 and the limiting sleeve 1, to prevent the top sleeve 2 and the limiting sleeve 1 from slipping, and to ensure the structural stability of the anti-breakage knife mechanism.

[0042] Example 2

[0043] This embodiment provides a milling cutter assembly for craniotomy, including a skull milling cutter 3 and a milling cutter hook 4. The skull milling cutter 3 and the milling cutter hook 4 are detachably connected, and also includes the anti-breakage mechanism of embodiment one. The limiting sleeve 1 is detachably connected to the tool housing 304 of the skull milling cutter 3. The hook portion of the milling cutter hook 4 can abut against the outer wall of the skull 11, and the top sleeve 2 cooperates with the milling cutter hook 4 to clamp the skull 11.

[0044] When the craniotomy milling cutter assembly of the present invention is working, the top sleeve 2 is tightly pressed against the surface of the skull 11 under the action of the elastic element 5, and cooperates with the milling cutter hook 4 to clamp the skull 11, so that the skull milling cutter 3 can remain perpendicular to the skull 11, thereby effectively alleviating the problem of tool breakage and improving the working safety factor of the craniotomy milling cutter assembly.

[0045] It needs to be explained here that the skull milling cutter 3 includes a tool body, a tool shaft 303 and a tool housing 304, wherein the tool body includes a tool head 301 with a cutting edge and a tool handle 302 for clamping, and the tool handle 302 is connected to the tool shaft 303 to drive the tool body to rotate so as to realize drilling and milling of the skull 11. The tool shaft 303 can be rotatably connected to the tool housing 304, and the external power mechanism can be connected to the tool housing 304. The tool housing 304 supports the tool body, the power mechanism and the tool shaft 303 without affecting the rotation of the tool shaft 303 and the tool body. The specific structural composition of the skull milling cutter 3 and the selection of the power mechanism are common knowledge of those skilled in the art and will not be repeated here.

[0046] In this specific embodiment, the limiting sleeve 1 is threadedly connected to the tool housing of the head milling cutter 3, and the connection is tight and convenient for disassembly and assembly. When using head milling cutters 3 of different specifications, the anti-breakage tool mechanism can be conveniently disassembled and assembled.

[0047] In other specific embodiments that can be implemented by the present invention, the milling cutter hook 4 passes through the top sleeve 2 and is connected to the head milling cutter 3. The milling cutter hook 4 and the head milling cutter 3 are detachably connected, which facilitates the disassembly and assembly of the two and provides convenience for operations such as cleaning and disinfection. It should also be explained here that the structure and connection method of the milling cutter hook 4 and the head milling cutter 3 are conventional means used by those skilled in the art and will not be repeated here.

[0048] In the anti-breakage knife mechanism of the present invention, the top sleeve 2 always has a tendency to move downward (toward the head) under the elastic force of the elastic element 5. During craniotomy, the hook portion of the milling cutter hook 4 penetrates into the brain and hooks the inner wall of the skull 11. The top sleeve 2 always presses against the outer wall of the skull 11 under the action of the elastic element 5, thereby clamping the skull 11, so that the skull milling cutter 3 and the skull 11 remain vertical under any circumstances, thereby preventing the knife from breaking and protecting the dura mater 12 from damage.

[0049] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A knife-breaking prevention mechanism, characterized in that: include: A limiting sleeve, which can be detachably connected to the tool housing of the cranial milling cutter; A top sleeve, one end of which is slidably connected to the limiting sleeve, and the other end of which can be abutted against the outer wall of the skull; the end of the top sleeve abutting against the outer wall of the skull cooperates with the curved hook of the milling cutter to clamp the skull, and the end of the top sleeve abutting against the outer wall of the skull is perpendicular to the feed direction of the cutter head of the skull milling cutter.

2. The anti-breakage knife mechanism according to claim 1, characterized in that: The limiting sleeve is a cylindrical structure, one end of the top sleeve can be slidably extended into the limiting sleeve and an elastic element is arranged between the two.

3. The anti-breakage knife mechanism according to claim 2, characterized in that: The elastic element is a spring, and the elastic element is sleeved on the outside of the skull milling cutter.

4. The anti-breakage knife mechanism according to claim 2, characterized in that: The top sleeve includes a connecting tube and a pressing block. The connecting tube is slidably connected to the limiting sleeve. The end of the connecting tube away from the limiting sleeve is connected to the pressing block. Under the elastic force of the elastic element, the pressing block can be pressed on the outer wall of the skull. The pressing block is perpendicular to the axial direction of the skull milling cutter.

5. The anti-breakage knife mechanism according to claim 4, characterized in that: The pressing block comprises two parallel supporting plates, and the cutter head of the skull milling cutter can pass through the gap between the two supporting plates.

6. The anti-breakage knife mechanism according to claim 5, characterized in that: The pressing block is a U-shaped structure and further includes an intermediate connecting plate, which connects one end of the two support plates and is connected to the connecting tube.

7. The anti-breakage knife mechanism according to claim 4, characterized in that: A retaining ring is provided between the connecting tube and the limiting sleeve to limit the extreme positions of the connecting tube and the limiting sleeve.

8. A craniotomy milling cutter assembly, comprising a skull milling cutter and a milling cutter hook, wherein the skull milling cutter and the milling cutter hook are detachably connected, characterized in that: It also includes the anti-breakage knife mechanism according to any one of claims 1 to 7, the limiting sleeve is detachably connected to the tool housing of the skull milling cutter, the hook portion of the milling cutter hook can abut against the outer wall of the skull, and the top sleeve cooperates with the milling cutter hook to clamp the skull.

9. The craniotomy milling cutter assembly according to claim 8, characterized in that: The limiting sleeve is threadedly connected to the tool housing of the head milling cutter.

10. The craniotomy milling cutter assembly according to claim 8, characterized in that: The milling cutter hook passes through the top sleeve and is connected with the skull milling cutter.

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