Medical milling cutter and medical milling cutter

Abstract

The utility model discloses a medical milling cutter and a medical milling cutter, and the medical milling cutter comprises an outer cutter tube, an inner cutter tube and an inner cutter tube, the inner cutter bar is rotatably sleeved in the outer cutter tube; the wear-resistant structure is arranged at the far end of the outer knife tube; the far end of the milling head extends out of the far end of the outer cutter tube, and the near end of the milling head penetrates through the wear-resistant structure and is connected with the far end of the inner cutter bar. According to the technical scheme, the service life of the medical milling cutter is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, and particularly relates to a medical milling cutter and a medical milling tool. Background Art

[0002] Medical milling cutters are usually used in orthopedic surgeries to mill bone tissues.

[0003] There is a conventional medical milling cutter, which includes a milling head, an inner tool rod and an outer tool tube. The inner tool rod is rotatably arranged inside the outer tool tube. One end of the milling head is connected to the inner tool rod inside the outer tool tube, and the other end extends outside the outer tool tube. The rotation of the inner tool rod drives the milling head to rotate, thereby realizing the milling function.

[0004] However, during the rotation of the milling head, wear is likely to occur between the milling head and the outer tool tube, resulting in a short service life of this medical milling cutter. Summary of the Utility Model

[0005] The main purpose of the utility model is to provide a medical milling cutter, aiming to extend the service life of the medical milling cutter.

[0006] To achieve the above purpose, the medical milling cutter proposed by the utility model includes:

[0007] An outer tool tube;

[0008] An inner tool rod, rotatably sleeved inside the outer tool tube;

[0009] A wear-resistant structure, arranged at the distal end of the outer tool tube;

[0010] A milling head, the distal end of the milling head extends out of the distal end of the outer tool tube, and the proximal end of the milling head passes through the wear-resistant structure and is connected to the distal end of the inner tool rod.

[0011] In an embodiment, the wear-resistant structure includes:

[0012] A support member, the support member has a first end and a second end. The first end faces the end of the outer tool tube close to the milling head, and the second end extends in a direction away from the first end. The first end is fixedly connected to the distal end of the outer tool tube, and part of the milling head extends into and passes through the first end and is fixedly connected to the distal end of the inner tool rod;

[0013] A bearing member, sleeved inside the second end of the support member and outside the part of the milling head extending into the second end.

[0014] In an embodiment, the bearing member is a copper sleeve or a wear-resistant rubber sleeve.

[0015] In one embodiment, the outer wall of the bearing member is in interference fit with the inner wall of the support member; and / or,

[0016] The inner diameter of the support member is greater than the inner diameter of the bearing member.

[0017] In one embodiment, the wear-resistant structure includes a wear-resistant layer, and the wear-resistant layer is provided on the inner wall of the outer cutter tube facing the milling head.

[0018] In one embodiment, the outer cutter tube is provided with a bent section, and the inner cutter bar is provided with a flexible section, and the flexible section is arranged corresponding to the bent section.

[0019] In one embodiment, the bent section is arranged at one end of the outer cutter tube away from the milling head.

[0020] In one embodiment, the inner cutter bar includes:

[0021] A flexible member rotatably passing through the outer cutter tube, one end of the flexible member is connected to the milling head, and the other end of the flexible member is connected to a driving mechanism; and

[0022] A protective sleeve sleeved on the outside of the flexible member, and there is a gap between the protective sleeve and the outer cutter tube.

[0023] In one embodiment, it further includes:

[0024] A handle body, the outer cutter tube is fixed to the handle body; and

[0025] A transmission assembly rotatably arranged in the handle body and drivingly connected to the other end of the inner cutter bar.

[0026] The present utility model further provides a medical milling cutter, including:

[0027] The above-mentioned medical milling tool; and

[0028] A power handle provided with a driving mechanism, and the driving mechanism is drivingly connected to the inner cutter bar.

[0029] The medical milling cutter in the technical solution of the present utility model includes a milling head, an inner tool rod, an outer tool tube, and a wear-resistant structure. The driving mechanism of the power handle transmits power to the milling head through the inner tool rod. The inner tool rod rotates inside the outer tool tube, driving the milling head to rotate to achieve the milling function. The outer tool tube provides support and protection for the inner tool rod, and also prevents the rotating inner tool rod from accidentally injuring other tissues during the operation, and can reduce the noise during the operation of the cutter. The wear-resistant structure is arranged at one end of the outer tool tube close to the milling head. During the use of the medical milling cutter, the wear-resistant structure contacts the high-speed rotating milling head. On the one hand, the outer tool tube provides support for the milling head through the wear-resistant structure, ensuring the stability of the rotation of the milling head; on the other hand, the wear-resistant structure generates less wear during the rotation of the milling head, avoiding the direct wear of the outer tool tube by the milling head, thereby extending the service life of the medical milling cutter; on the other hand, the wear-resistant structure generates less wear during the rotation of the milling head, reducing the influence of wear debris on the surgical site and improving the safety of the operation. Description of the Drawings

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0031] Figure 1 It is a cross-sectional view of an embodiment of the medical milling cutter of the present utility model;

[0032] Figure 2 is Figure 1 a partial enlarged view of part A in

[0033] Figure 3 is Figure 1 a partial enlarged view of part B in

[0034] Figure 4 It is a structural schematic diagram of an embodiment of the medical milling cutter of the present utility model;

[0035] Figure 5 is Figure 4 a partial enlarged view of part C in

[0036] Explanation of the reference numerals in the drawings:

[0037] 100. Milling head;

[0038] 200. Inner tool rod; 210. Flexible part; 220. Protective sleeve;

[0039] 300. Outer tool tube; 310. Bending section;

[0040] 400, wear-resistant structure; 410, support member; 420, bearing member;

[0041] 500, handle body;

[0042] 600, transmission assembly.

[0043] The realization, functional features and advantages of the present utility model will be further described in conjunction with the embodiments and with reference to the accompanying drawings. Detailed implementation manners

[0044] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0045] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0046] In the present utility model, unless otherwise clearly defined and limited, terms such as "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0047] In addition, if the descriptions such as "first" and "second" are involved in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and / or" appearing throughout the text includes three parallel scenarios. Taking "A and / or B" as an example, it includes scenario A, or scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those skilled in the art can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0048] The present utility model provides a medical milling cutter.

[0049] Referring to Figures 1 to 2 , Figure 1 is a cross-sectional view of an embodiment of the medical milling cutter of the present utility model, Figure 2 is Figure 1 a partial enlarged view of part A in

[0050] In the embodiment of the present utility model, the medical milling cutter includes:

[0051] An outer cutter tube 300;

[0052] An inner cutter bar 200, rotatably sleeved inside the outer cutter tube 300;

[0053] A wear-resistant structure 400, provided at the distal end of the outer cutter tube 300;

[0054] A milling head 100, the distal end of the milling head 100 extends out of the distal end of the outer cutter tube, and the proximal end of the milling head passes through the wear-resistant structure 400 and is connected to the distal end of the inner cutter bar 200.

[0055] It should be noted that in this solution, the distal end and the proximal end are referenced based on the relative position of the instrument and the surgical site. The position close to the surgical site is the distal end of the instrument, and the position far from the surgical site is the proximal end.

[0056] The medical milling cutter in the technical solution of the present utility model includes a milling head 100, an inner cutter bar 200, an outer cutter tube 300 and a wear-resistant structure 400. The driving mechanism of the power handle transmits power to the milling head 100 through the inner cutter bar 200. The inner cutter bar 200 rotates inside the outer cutter tube 300, driving the milling head 100 to rotate to achieve the milling function. The outer cutter tube 300 provides support and protection for the inner cutter bar 200, and also prevents the rotating inner cutter bar 200 from accidentally injuring other tissues during the operation, and can reduce the noise during the operation of the cutter. The wear-resistant structure 400 is fixed to one end of the outer cutter tube 300 close to the milling head 100 (that is, the wear-resistant structure is fixedly arranged at the distal end of the outer cutter tube). During the use of the medical milling cutter, the wear-resistant structure 400 contacts the high-speed rotating milling head 100. On the one hand, the outer cutter tube 300 provides support for the milling head 100 through the wear-resistant structure 400, ensuring the stability of the rotation of the milling head 100; on the other hand, the wear-resistant structure 400 has less wear during the rotation of the milling head 100, avoiding the direct wear of the outer cutter tube 300 by the milling head 100, thereby extending the service life of the medical milling cutter; on the other hand, the wear-resistant structure 400 has less wear during the rotation of the milling head 100, reducing the influence of wear debris on the surgical site and improving the safety of the operation.

[0057] In one embodiment, the wear-resistant structure 400 includes:

[0058] A support member 410, the support member 410 has a first end and a second end. The first end faces the end of the outer cutter tube 300 close to the milling head 100, and the second end extends in a direction away from the first end. The first end is fixedly connected to the distal end of the outer cutter tube 300, and a part of the milling head 100 extends into and passes through the first end and is fixedly connected to the distal end of the inner cutter bar 200;

[0059] A bearing member 420, which is sleeved inside the second end of the support member 410 and outside the part of the milling head 100 extending into the second end.

[0060] Refer to Figure 2, in the embodiment of the present utility model, the support member 410 is fixed to one end of the outer cutter tube 300 close to the milling head 100 and sleeved on one end of the milling head 100 connected to the inner cutter bar 200. The support member 410 mainly plays a role in supporting and protecting the milling head 100. The bearing member 420 is arranged inside the support member 410 and sleeved outside the milling head 100. The bearing member 420 has good lubrication performance. During the rotation of the milling head 100, the friction between the milling head 100 and the bearing member 420 is small, and the wear is also small, so that the rotation of the milling head 100 is smoother and the service life of the medical milling tool is extended. Specifically in this embodiment, the first end of the support member 410 is inserted into the outer cutter tube 300 and fixed to the outer cutter tube 300, and the second end of the support member 410 extends outside the outer cutter tube 300, improving the connection strength between the support member 410 and the outer cutter tube 300. Among them, in combination with Figure 2 and Figure 5 , in the part of the support member 410 located outside the outer cutter tube 300, along the direction away from the outer cutter tube 300, the outer diameter of the support member 410 decreases, reducing the occlusion of the surgical field of view by the support member 410 and improving the convenience for the user to visually observe the surgical site.

[0061] In one embodiment, the bearing member 420 is a copper sleeve or a wear-resistant rubber sleeve.

[0062] In the embodiment of the present utility model, the bearing member 420 is a copper sleeve. On the one hand, the copper sleeve has good self-lubricity, which can reduce friction, thereby reducing wear and improving the smoothness of the rotation of the milling head 100; on the other hand, the copper sleeve has a simple structure, is easy to process, and has a low manufacturing cost; on the other hand, the copper sleeve has good corrosion resistance. In an environment such as blood or body fluid during the operation, the performance of the copper sleeve is not easily affected, thereby extending the service life of the medical milling tool. The bearing member 420 can also be a wear-resistant rubber sleeve. On the one hand, it has good wear resistance, and on the other hand, it has slight elasticity, avoiding the rigid collision between the milling head 100 and the bearing member 420 when the milling head 100 has radial runout, playing a certain protective role for the milling head 100 and extending the service life of the milling head 100, and further extending the service life of the medical milling tool.

[0063] In one embodiment, the outer wall of the bearing member 420 is in interference fit with the inner wall of the support member 410; and / or,

[0064] The inner diameter of the support member 410 is greater than the inner diameter of the bearing member 420.

[0065] In the embodiment of the present utility model, the bearing member 420 is installed in the support member 410 by an interference fit method, ensuring that the bearing member 420 is firmly fixed, reducing the possibility of the bearing member 420 falling off, and the assembly method is relatively simple and easy to operate.

[0066] Refer toFigure 2 , in the embodiment of the present utility model, the inner diameter of the support member 410 is larger than the inner diameter of the bearing member 420, which can ensure that the bearing member 420 contacts the milling head 100 instead of the support member 410 contacting the milling member, thereby ensuring the effect of the wear-resistant structure 400 in reducing friction and wear and prolonging the service life of the medical milling tool.

[0067] In one embodiment, the wear-resistant structure 400 includes a wear-resistant layer, and the wear-resistant layer is provided on the inner wall of the outer cutter tube 300 facing the milling head 100.

[0068] In the embodiment of the present utility model, the wear-resistant structure 400 is a wear-resistant layer, and the wear-resistant layer is provided on the inner wall of the outer cutter tube 300 facing the milling head 100 to reduce the friction between the milling head 100 and the outer cutter tube 300, thereby prolonging the service life of the medical milling tool. Among them, the wear-resistant layer can be made of highly wear-resistant materials such as cemented carbide, ceramics, etc.

[0069] In one embodiment, the outer cutter tube 300 is provided with a bending section 310, and the inner cutter rod 200 is provided with a flexible section, and the flexible section is arranged corresponding to the bending section 310.

[0070] Referring to Figure 1 and Figure 4 , in the embodiment of the present utility model, the outer cutter tube 300 is provided with a bending section 310. On the one hand, it provides more surgical operation angles, enabling the medical milling tool to be applicable to surgical sites with complex angles. On the other hand, it provides a more convenient surgical vision for the user, thereby improving the accuracy and safety of the surgery. The inner cutter rod 200 is provided with a flexible section, and through the setting of the flexible section, the inner cutter rod 200 can be bent at any angle. When the inner cutter rod 200 is inserted into the outer cutter tube 300, the flexible section is inserted into the bending section 310, enabling the inner cutter rod 200 to rotate within the outer cutter tube 300.

[0071] In one embodiment, the bending section 310 is provided at one end of the outer cutter tube 300 away from the milling head 100.

[0072] Referring to Figure 1 and Figure 4 , in the embodiment of the present utility model, the bending section 310 is provided at one end of the outer cutter tube 300 away from the milling head 100, making the bending section 310 closer to the user's hand-held part, further reducing the occlusion of the surgical site by the milling tool and providing a more convenient surgical vision for the user, thereby improving the accuracy and safety of the surgery.

[0073] In one embodiment, the inner cutter rod 200 includes:

[0074] a flexible member 210, rotatably inserted into the outer cutter tube 300, one end of the flexible member 210 is connected to the milling head 100, and the other end of the flexible member 210 is connected to the driving mechanism; and

[0075] A protective sleeve 220 is sleeved outside the flexible member 210, and there is a gap between the protective sleeve 220 and the outer cutter tube 300.

[0076] In an embodiment of the present utility model, the entire inner cutter bar 200 is designed to be flexible, so that the same inner cutter bar 200 can be applicable to outer cutter tubes 300 with different bending positions and different bending angles, broadening the adaptation range of the inner cutter bar 200 and improving the interchangeability of the inner cutter bar 200. Refer to Figure 3 , the inner cutter bar 200 includes a flexible member 210 and a protective sleeve 220. The flexible member 210 can be made of metal wire, such as steel wire or copper wire, etc., which not only ensures the flexibility of the inner cutter bar 200, but also enables the inner cutter bar 200 to have a certain strength, reducing the possibility of the inner cutter bar 200 breaking during rotation. The protective sleeve 220 is sleeved outside the flexible member 210 and plays a role in protecting the flexible member 210. On the one hand, it avoids the direct friction between the flexible member 210 and the inner wall of the outer cutter tube 300, reducing the possibility of the flexible member 210 breaking and prolonging the service life of the flexible member 210; on the other hand, even if the flexible member 210 has a breakage problem, the broken flexible member 210 is wrapped inside the protective sleeve 220, avoiding the medical milling cutter head falling into the surgical site due to the breakage of the inner cutter bar 200 and improving the safety of the operation; on the other hand, the protective sleeve 220 is made of wear-resistant and self-lubricating materials, such as polyvinyl fluoride, polyvinylidene fluoride, etc., and there is a gap between the protective sleeve 220 and the outer cutter tube 300, reducing the friction between the inner cutter bar 200 and the inner wall of the outer cutter tube 300 during rotation, thereby reducing the heat generated during the milling process.

[0077] In an embodiment, the medical milling tool further includes:

[0078] A handle body 500, the outer cutter tube 300 is fixed to the handle body 500; and

[0079] A transmission assembly 600, rotatably arranged inside the handle body 500 and drivingly connected to the other end of the inner cutter bar 200.

[0080] Refer to Figure 1, in the embodiment of the present utility model, the medical milling cutter further includes a shank 500 and a transmission assembly 600. The outer cutter tube 300 is fixed to the shank 500, and the transmission assembly 600 is rotatably arranged inside the shank 500. The shank 500 plays a role in supporting and protecting the transmission assembly 600, and the transmission assembly 600 plays a role in drivingly connecting the driving mechanism of the power handle and the inner cutter bar 200. Specifically in this embodiment, the transmission assembly 600 includes a connecting shaft and a bearing. The bearing is sleeved outside the connecting shaft and arranged inside the shank 500. One end of the connecting shaft is provided with a joint for connecting the power handle, and the other end of the transmission assembly 600 is provided with a slot. The flexible member 210 of the inner cutter bar 200 is inserted into the slot and welded and fixed. By providing the connecting shaft, it is convenient to connect the medical milling cutter and the power handle, and the disassembly and assembly difficulty of the medical milling cutter is reduced.

[0081] The present utility model also proposes a medical milling cutter, including:

[0082] The above-mentioned medical milling cutter; and

[0083] A power handle, the power handle is provided with a driving mechanism, and the inner cutter bar 200 is drivingly connected through the driving mechanism.

[0084] For the specific structure of the medical milling cutter, refer to the above-mentioned embodiment. Since this medical milling cutter adopts all the technical solutions of the above-mentioned all embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be elaborated one by one here. Among them, the power handle generally includes a handle body and a driving mechanism arranged inside the handle body. The user holds the handle body to perform a milling operation on the target tissue. The outer cutter tube 300 is connected to the handle body, and the driving mechanism drives the inner cutter bar 200 to rotate. The driving mechanism can adopt a motor or a reducer, etc.

[0085] The above are only optional embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. All equivalent structural transformations made under the inventive concept of the present utility model by using the content of the specification and drawings of the present utility model, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present utility model.

Claims

1. A medical milling tool, characterized in that: include: External knife tube; An inner knife rod is rotatably sleeved on the outer knife tube; A wear-resistant structure, arranged at the distal end of the outer knife tube; A milling head, the distal end of which extends out of the distal end of the outer tool tube, and the proximal end of which passes through the wear-resistant structure and is connected to the distal end of the inner tool rod.

2. The medical milling tool according to claim 1, characterized in that: The wear-resistant structure comprises: A support member, the support member having a first end and a second end, the first end facing one end of the outer tool tube close to the milling head, the second end extending in a direction away from the first end, the first end being fixedly connected to the distal end of the outer tool tube, and a portion of the milling head extending from the second end into and through the first end and fixedly connected to the distal end of the inner tool rod; The bearing member is internally sleeved on the second end of the support member and externally sleeved on the portion of the milling head extending into the second end.

3. The medical milling tool according to claim 2, characterized in that: The bearing member is a copper sleeve or a wear-resistant rubber sleeve.

4. The medical milling tool according to claim 2, characterized in that: The outer wall of the bearing member is interference-fitted with the inner wall of the support member; and / or, The inner diameter of the support member is larger than the inner diameter of the bearing member.

5. The medical milling tool according to claim 1, characterized in that: The wear-resistant structure comprises a wear-resistant layer, and the wear-resistant layer is arranged on the inner wall of the outer tool tube facing the milling head.

6. The medical milling tool according to claim 1, characterized in that: The outer knife tube is provided with a curved section, and the inner knife rod is provided with a flexible section, and the flexible section is arranged corresponding to the curved section.

7. The medical milling tool according to claim 6, characterized in that: The curved section is arranged at an end of the outer tool tube away from the milling head.

8. The medical milling tool according to claim 1, characterized in that: The inner shank comprises: A flexible member is rotatably disposed in the outer tool tube, one end of the flexible member is connected to the milling head, and the other end of the flexible member is connected to the driving mechanism; and A protective sleeve is sleeved on the outside of the flexible member, and a gap is provided between the protective sleeve and the outer knife tube.

9. The medical milling tool according to claim 1, characterized in that: Also includes: A handle body, the outer knife tube is fixed to the handle body; as well as The transmission assembly is rotatably arranged in the handle body and is transmission-connected to the other end of the inner knife rod.

10. A medical milling cutter, characterized in that: include: The medical milling tool according to any one of claims 1 to 9; as well as A power handle is provided with a driving mechanism, and is driven and connected to the inner knife rod through the driving mechanism.

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