Bone knife and bone knife system
The detachable blade and knob design of the bone scalpel system solves the problem of poor compatibility of existing bone scalpels, enabling flexible replacement of various blades, reducing bone and soft tissue damage, and improving surgical efficiency and safety.
Patent Information
- Application Number
- CN202422508241.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-16
- Publication Date
- 2025-12-26
- Estimated Expiration
- 2034-10-16
AI Technical Summary
Existing bone cutters have poor compatibility in knee revision surgery, making it difficult to effectively separate multiple adhesive surfaces of the prosthesis, resulting in increased bone and soft tissue loss, and prolonging the difficulty and time of the surgery.
Design a bone scalpel system that allows for the replacement of different types of blades, including straight, curved, and hook-shaped blades, through a detachable blade head and knob structure, to adapt to different separation needs, and to be combined with a bone chisel for auxiliary operation.
It improves the flexibility and safety of surgery, reduces bone and soft tissue damage, and lowers surgical risks and costs.
Smart Images
Figure CN223715765U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to medical instrument technical field, specifically, relate to a bone knife and bone knife system. BACKGROUND
[0002] In knee joint revision surgery, especially the operation involving the tibia part, usually needs to use the bone knife to separate the prosthesis and the bone. But the bone knife structure form in the prior art is single, can only separate the prosthesis front side bonding surface, for the side surface or the bonding surface behind the prosthesis needs to replace the bone knife of different types, lead to the compatibility of the bone knife is poor. In addition, the effect of separating the prosthesis through the single form bone knife is poor, is easy to lead to more bone loss and soft tissue injury, is not favorable to the postoperative recovery of patients, and increases the difficulty and time of operation. SUMMARY
[0003] The utility model aims at solving one of the technical problems in the related art at least to some extent.
[0004] Therefore, the embodiment of the utility model provides a bone knife, which can facilitate doctors to replace different types of knife heads to separate the prosthesis, and is beneficial to the intraoperative operation of doctors.
[0005] The embodiment of the utility model further provides a bone knife system.
[0006] The bone knife of the embodiment of the utility model comprises a handle, an installation channel is arranged in the handle, a knob is pivotally installed at one end of the handle, a knife head comprises a knife rod and a blade, the knife rod is detachably arranged in the installation channel, one end of the knife rod is threadedly connected with the knob, and the other end of the knife rod is connected with the blade.
[0007] According to the bone knife of the embodiment of the utility model, since the knob is pivotally installed at one end of the handle, and one end of the knife rod is threadedly connected with the knob, when installing the knife head, the doctor can pass the knife rod into the installation channel and threadedly connect the knob, when the doctor needs to replace the knife head, the knob can be rotated to be loosened from the knife rod, so that the doctor can replace different types of knife heads conveniently, and the installation and removal are convenient, and the cost is low. On the other hand, since the knob does not need to be separated from the handle when the knife head is installed and removed, the problem that the knob is loosened and falls is avoided, and the risk of operation is reduced.
[0008] In some embodiments, a first hole section is arranged in the knob, one end of the handle is pivotally installed in the first hole section, one end of the handle is provided with an annular groove, and the bone knife further comprises a limiting piece, the limiting piece is connected with the knob and extends into the annular groove in the radial direction of the first hole section.
[0009] In some embodiments, the limiting piece is threadedly connected with the knob, and / or the limiting piece is a plurality of limiting pieces, and the plurality of limiting pieces are arranged at intervals along the circumference of the knob.
[0010] In some embodiments, the osteotome further comprises a chisel, and the chisel is mounted at the end of the knob away from the handle.
[0011] In some embodiments, the chisel is detachably connected with the knob.
[0012] In some embodiments, a second hole section is arranged in the knob, and the second hole section is arranged at the end of the knob away from the handle, the chisel comprises a chisel body and a connecting section, one end of the connecting section is connected with the chisel body, and the other end of the connecting section is threadedly connected with the second hole section, and / or a weight-reducing hole is arranged in the chisel.
[0013] In some embodiments, an inner wall of the mounting channel is provided with a limiting groove, at least part of the blade extends into the mounting channel and is connected with the limiting groove, an outer circumferential wall of the knob is provided with a mounting hole, the mounting hole is used for mounting an auxiliary rod, the auxiliary rod can assist the knob to rotate relative to the handle, the osteotome further comprises an elastic layer, and the elastic layer is arranged on the outer circumferential wall of the handle, the osteotome further comprises a force applying rod, the force applying rod is connected with the handle and arranged adjacent to the knob, and the extending direction of the force applying rod is arranged orthogonally to the extending direction of the handle.
[0014] The osteotome system of another embodiment of the utility model, including osteotome, the osteotome is any one described in the embodiment of the utility model, the tool bit has multiple, and different kinds of tool bit can be replaceably mounted on the handle, and different kinds of blade have different shapes and / or bending radii.
[0015] According to the osteotome system of the embodiment of the utility model, different kinds of tool bit can be replaceably mounted on the handle, and different kinds of blade have different shapes and / or bending radii. Thus, the doctor can select different types of tool bit according to different separation conditions in operation, can reduce bone loss and soft tissue injury, and is beneficial to the postoperative recovery of the patient.
[0016] In some embodiments, the tool bit comprises a first tool bit, a second tool bit and a third tool bit, the blade of the first tool bit is a straight blade, the blade of the second tool bit is an arc-shaped blade, and the blade of the third tool bit is a hook-shaped blade.
[0017] In some embodiments, the straight blade is provided with a blade edge only on one side in the thickness direction thereof; and / or, the arc-shaped blade is provided with a blade edge on both sides in the thickness direction thereof; and / or, the hook-shaped blade has a hook body segment extending rearward in the axial direction of the shank, and the end of the hook body segment is provided with a blade edge. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 is the front view of the bone cutter (remove the cutter head) of the utility model embodiment.
[0019] Figure 2 is the cross-sectional view of the bone cutter (remove the cutter head) of the utility model embodiment.
[0020] Figure 3 is the front view of the bone cutter of an embodiment of the utility model.
[0021] Figure 4 is the cross-sectional view of the bone cutter of an embodiment of the utility model.
[0022] Figure 5 is the axial side view of the bone cutter of another embodiment of the utility model.
[0023] Figure 6 is the cross-sectional view of the bone cutter of another embodiment of the utility model.
[0024] Figure 7 is the cross-sectional view of the bone cutter of another embodiment of the utility model.
[0025] Figure 8 is the axial side view of the hook-shaped blade of the bone cutter of the embodiment of the utility model.
[0026] Figure 9 is the side view of the shank of the bone cutter of the embodiment of the utility model.
[0027] REFERENCE SIGNS:
[0028] 100, shank; 101, mounting channel; 102, annular groove; 103, limiting groove; 110, first shank segment; 120, second shank segment;
[0029] 200, knob; 201, first hole segment; 202, second hole segment; 203, mounting hole;
[0030] 300, cutter head; 310, first cutter head; 320, second cutter head; 330, third cutter head; 301, cutter rod; 302, blade; 3021, straight blade; 3022, arc-shaped blade; 3023, hook-shaped blade; 30231, hook body segment;
[0031] 400, bone chisel; 401, bone chisel body; 402, connecting segment; 403, weight-reducing hole;
[0032] 500, elastic layer;
[0033] 600, force applying rod;
[0034] 700, limiting member. DETAILED DESCRIPTION
[0035] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.
[0036] The following refers to the accompanying Figures 1 to 9 The bone cutter and the bone cutter system of the embodiments of the present application are described.
[0037] As Figures 1 to 4 shown, the bone cutter of the embodiments of the present application comprises a handle 100, a knob 200 and a cutter head 300. The handle 100 is provided with an installation channel 101, the knob 200 is pivotally installed at one end (for example, the rear end of the handle 100) of the handle 100, and the cutter head 300 comprises a cutter rod 301 and a cutter blade 302. The cutter rod 301 is detachably arranged in the installation channel 101, one end (for example, the rear end of the cutter rod 301) of the cutter rod 301 is threadedly connected with the knob 200, and the other end (for example, the front end of the cutter rod 301) of the cutter rod 301 is connected with the cutter blade 302. Figure 2 Figure 4 Figure 4
[0038] According to the bone cutter of the embodiments of the present application, since the knob 200 is pivotally installed at one end of the handle 100 and one end of the cutter rod 301 is threadedly connected with the knob 200, when the cutter head 300 is installed, the cutter rod 301 can be arranged in the installation channel 101 and screwed with the knob 200, and when the cutter head 300 needs to be replaced, the knob 200 can be rotated to loosen the knob 200 and the cutter rod 301, so that the doctor can conveniently replace different types of cutter heads 300, and the assembly and disassembly are convenient.
[0039] On the other hand, since the knob 200 does not need to be separated from the handle 100 when the cutter head 300 is disassembled, the problem of loosening and falling of the knob 200 is avoided, which is conducive to reducing the risk of surgery. It can be understood that, compared with the scheme that the knob 200 and the handle 100 are designed as an independent split structure, the bone cutter of the embodiments of the present application can reduce the risk of falling of the knob 200 during the operation of the doctor.
[0040] In addition, compared with the non-detachable scheme of the shank 100 and the tool bit 300, the bone cutter of the embodiment of the utility model can share one shank 100 by multiple tool bits 300, thereby reducing the production cost of the bone cutter.
[0041] Optionally, as shown in Figure 2 and Figure 4 , the knob 200 is provided with a first hole section 201, one end of the shank 100 is pivotally installed in the first hole section 201, one end of the shank 100 is provided with an annular groove 102, and the bone cutter further comprises a limiting piece 700, the limiting piece 700 is connected with the knob 200 and extends into the annular groove 102 along the radial direction of the first hole section 201. It can be understood that when the knob 200 rotates relative to the shank 100, the limiting piece 700 can slide in the annular groove 102, and when the knob 200 is subjected to an axial pulling force, the limiting piece 700 can be constrained by the annular groove 102 to avoid separation of the knob 200 from the shank 100.
[0042] The bone cutter of the embodiment of the utility model limits the axial movement of the knob 200 by the limiting piece 700 through the cooperation structure of the knob 200 and the shank 100, thereby preventing the knob 200 from separating from the shank 100 along the axial direction of the shank 100, and improving the stability of the installation of the knob 200.
[0043] For example, the limiting piece 700 is threadedly connected with the knob 200. It can be understood that the limiting piece 700 is a threaded pin, the threaded pin is provided in the first hole section 201 along the radial direction of the knob 200 and extends into the annular groove, thereby facilitating the disassembly and assembly of the knob 200 and the shank 100, and the manufacturing process is simple.
[0044] For another example, the limiting piece 700 is a pin, and the pin is inserted on the knob 200 in an interference fit manner and extends into the annular groove.
[0045] Optionally, the limiting piece 700 is a plurality of limiting pieces 700, and the plurality of limiting pieces 700 are arranged at intervals along the circumferential direction of the knob 200. It can be understood that the plurality of limiting pieces 700 jointly limit the axial movement of the knob 200 to improve the coaxiality of the knob 200 when rotating and avoid the problem of jamming when the knob 200 rotates.
[0046] In some embodiments, as shown in Figure 7 , the bone cutter further comprises a bone chisel 400, and the bone chisel 400 is installed at one end of the knob 200 away from the shank 100 (for example, the rear end of the knob 200 in Figure 7 . It can be understood that the bone chisel 400 has a knocking surface, and doctors can use tools to knock the knocking surface of the bone chisel 400 to help the blade 302 separate the prosthesis and the bone more quickly, which is beneficial to improve the efficiency of separating the prosthesis.
[0047] Optionally, as shown in Figure 7 The bone chisel 400 is detachably connected with the knob 200. It can be understood that when the doctor does not need to knock the bone knife, the bone chisel 400 can be detached from the knob 200 to reduce the weight of the bone knife and facilitate the intraoperative operation of the doctor.
[0048] In the examples of the present application, as shown in Figure 2 and Figure 7 The knob 200 is provided with a second hole section 202, which is located at one end of the knob 200 away from the handle 100. The bone chisel 400 has a bone chisel body 401 and a connecting section 402. One end of the connecting section 402 is connected with the bone chisel body 401, and the other end of the connecting section 402 is threadedly matched with the second hole section 202. It can be understood that the bone chisel 400 is threadedly matched with the knob 200, thereby facilitating the doctor to disassemble and assemble the bone chisel 400.
[0049] The second hole section 202 is located on the same axis as the mounting channel 101. The axis of the connecting portion and the axis of the bone chisel body 401 are collinear with the axis of the second hole section 202, thereby avoiding the problem of the bone chisel 400 being installed and sinking.
[0050] As shown in Figure 7 In order to reduce the weight of the bone chisel 400, a weight-reducing hole 403 can be provided on the bone chisel 400. For example, the weight-reducing hole 403 is a plurality of weight-reducing holes 403, which penetrate the bone chisel body 401 along the axial direction of the bone chisel body 401, and the plurality of weight-reducing holes 403 are arranged at intervals around the axial direction of the bone chisel body 401.
[0051] In some embodiments, as shown in Figure 2 and Figure 9 The inner wall of the mounting channel 101 is provided with a limiting groove 103. At least part of the blade 302 extends into the mounting channel 101 and is matched with the limiting groove 103. It can be understood that the blade 302 is a flat structure. Since at least part of the blade 302 extends into the mounting channel 101 and is matched with the limiting groove 103, when the blade 302 rotates relative to the handle 100, the blade 302 and the limiting groove 103 can be limited by the matching structure to avoid the problem of the blade 300 rotating relative to the handle 100.
[0052] For example, the limiting groove 103 is two, and the two limiting grooves 103 are symmetrically arranged on both sides of the mounting channel 101. The two side edges of the blade 302 in the width direction are respectively matched with the two limiting grooves 103.
[0053] In other examples, the tool holder 301 engages with the mounting channel 101 in an anti-rotational manner. For instance, the tool holder 301 has a non-circular cross-section, thereby limiting its rotation relative to the mounting channel 101. Alternatively, the tool holder 301 and the mounting channel 101 may have corresponding protrusions and grooves to circumferentially limit the movement of the tool holder 301. This application does not limit the anti-rotation structure of the tool head 300 and the tool shank 100.
[0054] Optionally, such as Figure 1 and Figure 2 As shown, the outer peripheral wall of the knob 200 has a mounting hole 203 for mounting an auxiliary rod (not shown). The auxiliary rod assists the knob 200 in rotating relative to the handle 100. It can be understood that when the knob 200 is tightened relatively tightly with the handle 301, the doctor can insert the auxiliary rod into the mounting hole 203. Using the principle of leverage, the doctor applies a circumferential rotational force to the auxiliary rod to help loosen the knob 200. When it is not necessary to rotate the knob 200, the doctor can detach the auxiliary rod from the mounting hole 203 to use the bone scalpel.
[0055] Optionally, such as Figure 1 and Figure 2 As shown, the bone scalpel also includes an elastic layer 500, which is disposed on the outer peripheral wall of the handle 100, thereby reducing the discomfort of doctors holding it for a long time.
[0056] For example, the elastic layer 500 is a silicone sleeve, which is injection molded onto the handle 100 to prevent the elastic layer 500 from detaching from the handle 100, thus extending the service life of the bone knife.
[0057] Specifically, such as Figure 2 and Figure 4 As shown, the tool holder 100 includes a first shank segment 110 and a second shank segment 120, which are coaxially connected. A mounting channel 101 passes through both the first shank segment 110 and the second shank segment 120. For example, a limiting groove 103 can be formed in the first shank segment 110, and an annular groove 102 can be formed in the second shank segment 120. The first shank segment 110 and the second shank segment 120 can be manufactured separately and then welded together, thereby facilitating the manufacturing of the tool holder 100.
[0058] Optionally, such as Figure 1 and Figure 3 As shown, the bone scalpel also includes a force-applying rod 600, which is connected to the handle 100 and located adjacent to the knob 200. The extension direction of the force-applying rod 600 is orthogonal to the extension direction of the handle 100. When using the bone scalpel, the surgeon can hold the force-applying rod 600 and the handle 100 with their hand, facilitating intraoperative operation and preventing slippage.
[0059] The bone knife system of another embodiment of the utility model, including bone knife, the bone knife is the bone knife of the utility model, the cutter head 300 has multiple, different kinds of cutter head 300 can be installed on the handle 100, different kinds of blade 302 have different shape and / or bending arc.
[0060] According to the embodiment of the utility model's bone knife system, because different kinds of cutter head 300 can be installed on the handle 100, different kinds of blade 302 have different shape and / or bending arc. Thus the doctor can select different types of cutter head 300 according to the different separation in operation, can reduce bone loss and soft tissue injury, is favorable for the postoperative recovery of patient.
[0061] Optionally, as shown in Figure 3 、 Figure 5 and Figure 7 , the cutter head 300 includes the first cutter head 310, the second cutter head 320 and the third cutter head 330, the blade 302 of the first cutter head 310 is straight blade 3021, the blade 302 of the second cutter head 320 is arc blade 3022, and the blade 302 of the third cutter head 330 is hook-shaped blade 3023. It can be understood that the first cutter head 310, the second cutter head 320 and the third cutter head 330 are replaceably connected with the handle 100.
[0062] As shown in Figure 3 , the first cutter head 310 (straight blade 3021) is used for preliminary separation operation in front of tibia, and the straight blade 3021 is designed without angle, which can reduce the interference of the blade 302 to other parts of the joint. For example, the straight blade 3021 is provided with a blade edge on one side in the thickness direction, that is, the straight blade 3021 adopts single-blade design, so as to avoid the problem of bone loss when the tibia is separated from the tibial support, and is favorable for the postoperative recovery of patient.
[0063] As shown in Figure 5 , the second cutter head 320 (arc blade 3022) is used for separating the areas on both sides of the tibial platform and the areas difficult to reach by the straight blade 3021, and the arc blade 3022 can provide the doctor with additional operation angle. For example, the arc blade 3022 is provided with a blade edge on both sides in the thickness direction, that is, the arc blade 3022 adopts double-blade design, so as to facilitate the simultaneous use of the inner and outer sides of the arc blade 3022.
[0064] As shown in Figure 7 and Figure 8 , the third cutter head 330 (hook-shaped blade 3023) is used for separating the posterior side of the tibia and the tibial platform, and the hook-shaped blade 3023 is provided with a hook-shaped groove for the fixation and accurate separation of the doctor in operation.
[0065] Specifically, as shown in Figure 7 and Figure 8As shown, the hook-shaped blade 3023 has a hook body segment 30231 extending axially rearwardly along the shank 100, and the end of the hook body segment 30231 has a blade edge. It can be understood that the hook body segment 30231 of the hook-shaped blade 3023 is a 180° reverse bending structure, and the end of the hook body segment 30231 has a blade edge, so that the doctor applies an external force to the hook-shaped blade 3023, and separates the tibial posterior side and the tibial platform, which is beneficial to improve the separation efficiency of the prosthesis.
[0066] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.
[0067] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.
[0068] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the internal communication or interaction relationship of two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0069] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.
[0070] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in the present application and the features of different embodiments or examples without contradiction.
[0071] Although the above embodiments have been shown and described, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. Changes, modifications, replacements and variations of the above embodiments made by those skilled in the art are within the scope of the present application.
Claims
1. An osteotome characterized by, The bone cutter comprises a handle, a mounting channel arranged in the handle, a knob pivotally arranged at one end of the handle, a cutter head comprising a cutter rod and a blade, the cutter rod being detachably arranged in the mounting channel, one end of the cutter rod being threadedly connected with the knob, and the other end of the cutter rod being connected with the blade. The knob is provided with a first hole section, one end of the handle is pivotally arranged in the first hole section, one end of the handle is provided with an annular groove, the bone cutter further comprises a limiting member, the limiting member is connected with the knob and extends into the annular groove in the radial direction of the first hole section. The limiting member is threadedly connected with the knob. The limiting member is arranged in the radial direction of the knob.
2. The osteotome of claim 1, wherein, The bone cutter further comprises a bone chisel, the bone chisel is arranged at the end of the knob away from the handle.
3. The osteotome of claim 2, wherein, The bone chisel is detachably connected with the knob. The knob is provided with a second hole section, the second hole section is arranged at the end of the knob away from the handle, the bone chisel has a bone chisel body and a connecting section, one end of the connecting section is connected with the bone chisel body, and the other end of the connecting section is threadedly connected with the second hole section.
4. The osteotome of claim 1, wherein, The bone chisel is provided with a weight-reducing hole.
5. The osteotome of claim 4, wherein, The inner wall of the mounting channel is provided with a limiting groove, at least part of the blade extends into the mounting channel and is connected with the limiting groove.
6. The osteotome of claim 5, wherein, The outer peripheral wall of the knob is provided with a mounting hole, the mounting hole is used for mounting an auxiliary rod, the auxiliary rod can assist the knob to rotate relative to the handle. The bone cutter further comprises an elastic layer, the elastic layer is arranged on the outer peripheral wall of the handle.
7. The osteotome of any one of claims 1-6, wherein, The bone cutter further comprises a force applying rod, the force applying rod is connected with the handle and arranged adjacent to the knob, the extending direction of the force applying rod is arranged perpendicular to the extending direction of the handle. The bone cutter comprises a bone cutter according to any one of claims 1-7, the cutter head has multiple types, different types of the cutter head are detachably arranged on the handle, and different types of the blade have different shapes and / or bending radii. The cutter head comprises a first cutter head, a second cutter head and a third cutter head, the blade of the first cutter head is a flat blade, the blade of the second cutter head is an arc-shaped blade, and the blade of the third cutter head is a hook-shaped blade. The flat blade is provided with a blade edge only on one side in the thickness direction of the flat blade.
8. An osteotome system characterized by, The arc-shaped blade is provided with a blade edge on both sides in the thickness direction of the arc-shaped blade.
9. The osteotome system of claim 8, wherein, The hook-shaped blade has a hook body section, the hook body section extends rearward in the axial direction of the handle, and the end of the hook body section has a blade edge.
10. The osteotome system of claim 9, wherein,