Saw blade and swing saw

Abstract

The utility model discloses a saw blade and a swing saw, and the saw blade comprises a saw blade main body which is provided with a plurality of first through holes; a plurality of rolling elements, wherein each rolling element is correspondingly arranged in the first through hole; the at least one protective cover covers the outer side of the rolling piece and is fixedly connected with the saw blade main body; a second through hole opposite to the first through hole is formed in the protective cover, and each rolling piece is rotatably fixed in the corresponding first through hole and the second through hole; part of the rolling face of the rolling piece penetrates through the first through hole and the second through hole and protrudes out of the surface of the saw blade body and the surface of the protective cover, so that rolling friction is generated between the rolling piece and an object making contact with the rolling piece. According to the utility model, the heat generated between the saw blade main body and the osteotomy surface of the cut bone tissue can be reduced, so that the bone tissue or bone cells are prevented from thermal damage, and the survival rate, the service life and the performance of the joint prosthesis are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a saw blade and an oscillating saw. Background Art

[0002] As my country's population ages, joint diseases have become common among the elderly, seriously impacting their quality of life. When joint diseases cannot be effectively treated with medication, artificial joint replacement becomes one of the best options for treating them.

[0003] During artificial joint replacement surgery, an oscillating saw is usually used to remove diseased or damaged human joints. Currently, there are many types of oscillating saws on the market, but these oscillating saws have a common defect: when using an oscillating saw to cut bone tissue, the friction between the saw blade and the bone tissue generates a large amount of heat. This heat can cause thermal damage to the bone tissue and bone cells in contact with the saw blade, resulting in failure of the bond between the implanted joint prosthesis (especially non-bone cement fixed prosthesis) and the body's retained bone (i.e., unresected bone tissue). This can cause the implanted joint prosthesis to loosen, seriously affecting the survival rate, service life, and performance of the joint prosthesis. Therefore, it is necessary to adjust the structure of the saw blade. Utility Model Content

[0004] The purpose of the present utility model is to provide a saw blade and an oscillating saw, which can reduce the heat generated between the saw blade body and the osteotomy surface of the cut bone tissue to avoid thermal damage to the bone tissue or bone cells, thereby ensuring the survival rate, service life and performance of the joint prosthesis.

[0005] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0006] A saw blade comprising:

[0007] a saw blade body, wherein the saw blade body is provided with a plurality of first through holes;

[0008] a plurality of rolling elements, each of the rolling elements being correspondingly disposed in the first through hole; and

[0009] At least one protective cover, covering the outer side of the rolling element and fixedly connected to the saw blade body; the protective cover is provided with a second through hole opposite to the first through hole, and each of the rolling elements is rotatably fixed in the corresponding first through hole and the second through hole;

[0010] Part of the rolling surface of the rolling element passes through the first through hole and the second through hole and protrudes from the surface of the saw blade body and the protective cover, so that rolling friction is generated between the rolling element and the contact object.

[0011] Optionally, the number of the protective cover is one, and the second through hole on the protective cover cooperates with the first through hole on the saw blade body to fix the rolling element between the protective cover and the saw blade body.

[0012] Optionally, there are two protective covers, and the saw blade body is located between the two protective covers; and the second through holes on the two protective covers cooperate with the first through holes on the saw blade body to fix the rolling element between the two protective covers.

[0013] Optionally, the rolling element is a sphere.

[0014] Optionally, the rolling element is an ellipsoid, and the central axis of the rolling element during rotation is parallel to the surface where the saw blade body and / or the protective cover are located.

[0015] Optionally, when the saw blade body performs an operation of cutting bone tissue, the contact object includes an osteotomy surface of the cut bone tissue.

[0016] Optionally, an osteotomy plate is fixed on the bone tissue, and the osteotomy plate is provided with a slit for the saw blade to pass through; the contact object also includes an end face of the slit.

[0017] Optionally, in the thickness direction of the osteotomy plate, the distance between two adjacent rolling elements is greater than 1 / 3 of the thickness of the osteotomy plate and less than 2 / 3 of the thickness of the osteotomy plate.

[0018] Optionally, saw teeth are provided at the end of the saw blade body, and a chip outlet is formed between the protective cover and the saw teeth.

[0019] On the other hand, the present invention further provides an oscillating saw, comprising: the saw blade as described above; and a motor connected to the saw blade, for driving the saw blade to swing so as to cut bone tissue.

[0020] The utility model has at least one of the following advantages:

[0021] The present invention provides a saw blade and an oscillating saw, wherein the saw blade body is provided with a plurality of first through holes, the protective cover is provided with second through holes opposite to the first through holes, and a rolling element is rotatably fixed in the corresponding first and second through holes, and a portion of the rolling surface of the rolling element passes through the first and second through holes and protrudes from the surface of the saw blade body and the protective cover, so as to generate rolling friction between the rolling element and the contact object. In the present invention, when the saw blade body performs the operation of cutting bone tissue, the contact object includes the osteotomy surface of the cut bone tissue; the provision of the rolling element can convert the sliding friction between the saw blade body and the osteotomy surface of the cut bone tissue in the prior art into rolling friction, thereby effectively reducing the heat generated between the saw blade body and the osteotomy surface of the cut bone tissue, thereby avoiding thermal damage to the bone tissue or bone cells, and ensuring the survival rate, service life and performance of the joint prosthesis.

[0022] The rolling element in the present invention can also convert the sliding friction between the saw blade body and the osteotomy plate in the prior art into rolling friction, thereby effectively reducing the heat generated between the saw blade body and the osteotomy plate, thereby avoiding deformation of the saw blade body due to heat, and ensuring the reliability of the saw blade.

[0023] In the utility model, a chip outlet is formed between the protective cover and the saw teeth of the saw blade; and bone chips generated when the saw teeth cut bone tissue can be discharged from the chip outlet, thereby avoiding bone chips from gathering at the saw teeth, and further allowing the cutting heat generated when the saw teeth cut the bone tissue to be dissipated in time, so as to avoid the cutting heat generated by the saw teeth causing thermal damage to the bone tissue or bone cells.

[0024] The saw blade body in the present invention becomes thinner than the saw blade body in the prior art while ensuring the unchanged cutting performance. Therefore, the end of the saw blade body in the present invention away from the saw teeth can be formed into or regarded as a spring sheet. In the process of using the saw blade body to cut bone tissue, the spring sheet can produce elastic deformation in the Z-axis direction, which can reduce the constraint imposed on the saw blade body by the staff's hand in the Z-axis direction, thereby avoiding the phenomenon of over-constraint, and further reducing the pressure between the saw blade body and the osteotomy plate, so as to reduce the friction between the saw blade body and the osteotomy plate, and further reduce the generation of heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a structural schematic diagram of a saw blade provided by one embodiment of the present utility model;

[0026] Figure 2 This is an exploded view of a saw blade provided with a protective cover according to one embodiment of the present invention;

[0027] Figure 3 This is an exploded view of a saw blade provided with two protective covers according to one embodiment of the present invention;

[0028] Figure 4 It is a structural schematic diagram of an oscillating saw provided by one embodiment of the utility model. DETAILED DESCRIPTION

[0029] The following is a further detailed description of a saw blade and an oscillating saw proposed by the present invention in conjunction with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the present invention will become clearer. It should be noted that the drawings are in a very simplified form and use non-precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the implementation of the present invention. In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, please refer to the drawings. It should be noted that the structure, proportion, size, etc. illustrated in the drawings of this specification are only used to match the content disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions for the implementation of the present invention, so they have no technical substantive significance. Any modification of the structure, change in the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose that can be achieved by the present invention.

[0030] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0031] Combined with attachment Figures 1 to 4 As shown, this embodiment provides a saw blade 100, comprising: a saw blade body 110, at least one protective cover 120 and a plurality of rolling elements 130 (such as Figure 2 The saw blade body 110 is provided with a plurality of first through holes 111 (as shown in FIG. Figure 2 Each of the rolling elements 130 is correspondingly disposed in the first through hole 111, i.e., the number of the rolling elements 130 is the same as the number of the first through holes 111. The protective cover 120 covers the outer side of the rolling elements 130, is disposed opposite to the saw blade body 110, and is fixedly connected to the saw blade body 110; the protective cover 120 is provided with a second through hole 121 (as shown) opposite to the first through hole 111. Figure 2(as shown), that is, the number of the second through holes 121 and the first through holes 111 are the same and are arranged in a one-to-one correspondence. Furthermore, each rolling element 130 is rotatably fixed within the corresponding first through hole 111 and second through hole 121; and a portion of the rolling surface of the rolling element 130 passes through the first through hole 111 and the second through hole 121 and protrudes from the surfaces of the saw blade body 110 and the protective cover 120, thereby generating rolling friction between the rolling element 130 and the contacting object.

[0032] Specifically, the end of the saw blade body 110 is provided with saw teeth 1101 (such as Figure 2 As shown), the saw blade body 110 is capable of cutting bone tissue; and when the saw blade body 110 performs the operation of cutting the bone tissue, the contact object of the rolling member 130 includes the osteotomy surface of the cut bone tissue, but the present invention is not limited to this.

[0033] In view of the problem in the prior art that sliding friction occurs between the saw blade body and the osteotomy surface of the cut bone tissue, and the sliding friction generates a large amount of heat, causing thermal damage to the bone tissue or bone cells, in this embodiment, the protective cover 120 is fixed to the outside of the saw blade body 110, and the first through hole 111 on the saw blade body 110 and the second through hole 121 on the protective cover 120 are matched, so that a plurality of rolling members 130 can be rotatably fixed to the saw blade body 110 and the protective cover 120; and the rolling members 130 protrude from the surfaces of the saw blade body 110 and the protective cover 120 so as to be able to contact the osteotomy surface of the cut bone tissue, thereby generating rolling friction between the rolling members 130 and the osteotomy surface of the cut bone tissue, thereby converting the sliding friction between the saw blade body and the osteotomy surface of the cut bone tissue in the prior art into rolling friction. Since the heat generated by rolling friction is much smaller than the heat generated by sliding friction, the setting of the rolling element 130 in this embodiment can effectively reduce the heat generated between the saw blade body 110 and the osteotomy surface of the cut bone tissue, thereby avoiding thermal damage to the bone tissue or bone cells, and thus ensuring the survival rate, service life and performance of the joint prosthesis.

[0034] In some embodiments, when the saw blade body 110 performs the operation of cutting bone tissue, an osteotomy plate 200 (such as Figure 4), and the osteotomy plate 200 is provided with a slit 201 through which the saw blade 100 (including the saw blade body 110, the protective cover 120, and the rolling element 130) passes, thereby constraining the saw blade 100 in the Z-axis direction, thereby limiting the travel of the saw blade 100 in the Z-axis direction, thereby preventing the saw blade 100 from moving in the Z-axis direction when cutting the bone tissue, thereby ensuring the cutting accuracy of the saw blade 100. In this case, the contact object of the rolling element 130 also includes the end surfaces of the slit 201 (i.e., the two end surfaces of the slit 201 that are opposite in the Z-axis direction), and rolling friction is generated between the rolling element 130 and the end surfaces of the slit 201, thereby converting the sliding friction between the saw blade body and the osteotomy plate 200 in the prior art into rolling friction. Since the heat generated by rolling friction is much smaller than the heat generated by sliding friction, the setting of the rolling element 130 in this embodiment can also effectively reduce the heat generated between the saw blade body 110 and the osteotomy plate 200, thereby avoiding deformation of the saw blade body 110 due to heat, and thus ensuring the reliability of the saw blade 100.

[0035] Specifically, all the rolling elements 130 are evenly distributed on the saw blade body 110 and the protective cover 120 to ensure that the rolling friction between the rolling elements 130 and the objects they contact is evenly distributed, thereby evenly distributing the heat generated by the rolling friction and preventing localized overheating. Optionally, all the rolling elements 130 can be distributed in a matrix or staggered arrangement, but the present invention is not limited thereto.

[0036] In one embodiment, in the width direction of the saw blade body 110, that is, in the Y-axis direction, the rolling elements 130 are distributed in at least two rows ( Figure 2 In the embodiment, four rows are arranged to ensure the distribution density of the rolling elements 130, thereby ensuring the contact area between the rolling elements 130 and the objects they contact, thereby ensuring rolling friction between the rolling elements 130 and the objects they contact, but the present invention is not limited thereto.

[0037] In another embodiment, in the length direction of the saw blade body 110, that is, the X-axis direction, the distance between two adjacent rolling elements 130 in the same row is greater than 1 / 3 of the thickness of the osteotomy plate 200 (that is, the side length of the osteotomy plate 200 in the X-axis direction) and less than 2 / 3 of the thickness of the osteotomy plate 200, so as to ensure the distribution density of the rolling elements 130, thereby ensuring the contact area between the rolling elements 130 and the osteotomy plate 200, and further ensuring the rolling friction between the rolling elements 130 and the osteotomy plate 200, but the present invention is not limited to this.

[0038] Specifically, the rolling element 130 is a sphere (such as Figure 2 and Figure 3 ) or an ellipsoid. Optionally, the rolling element is a steel ball. Furthermore, when the rolling element 130 is an ellipsoid, the central axis of the rolling element 130 during rotation is parallel to the surface of the saw blade body 110 and / or the protective cover 120, so as to ensure rolling friction between the rolling element 130 and the contact object. More specifically, if the rolling element 130 is a sphere, the first through hole 111 and the second through hole 121 are both circular; if the rolling element 130 is an ellipsoid, the first through hole 111 and the second through hole 121 are both elliptical.

[0039] Please continue to refer to Figure 2 In some embodiments, the number of the protective cover 120 is one, and the second through hole 121 on the protective cover 120 cooperates with the first through hole 111 on the saw blade body 110 to fix the rolling element 130 between the protective cover 120 and the saw blade body 110.

[0040] In this case, if the rolling element 130 is a sphere, the apertures of the first through hole 111 and the second through hole 121 are both smaller than the diameter of the rolling element 130 , so as to constrain the rolling element 130 between the protective cover 120 and the saw blade body 110 .

[0041] If the rolling member 130 is an ellipsoid, the long axis of the first through hole 111 and the second through hole 121 is less than or equal to the long axis of the rolling member 130, and the short axis of the first through hole 111 and the second through hole 121 is less than the long axis of the rolling member 130; or, the first through hole 111 and the second through hole 121 are smaller than the long axis of the rolling member, and the short axis of the first through hole 111 and the second through hole 121 is less than or equal to the long axis of the rolling member. No limitation is made here, as long as the rolling member 130 can be constrained between the protective cover 120 and the saw blade body 110.

[0042] Please continue to refer to Figure 3 In other embodiments, there are two protective covers 120, the saw blade body 110 is located between the two protective covers 120, and the second through holes 121 on the two protective covers 120 cooperate with the first through holes 111 on the saw blade body 110 to fix the rolling element 130 between the two protective covers 120.

[0043] In this case, if the rolling element 130 is a sphere, the aperture of the first through hole 111 is greater than or equal to the diameter of the rolling element 130, and the aperture of the second through hole 121 is smaller than the diameter of the rolling element 130, so as to constrain the rolling element 130 between the two protective covers 120.

[0044] If the rolling element 130 is an ellipsoid, the major axis of the first through hole 111 is greater than or equal to the major axis of the rolling element 130, and the minor axis of the first through hole 111 is greater than or equal to the major axis of the rolling element 130. The major axis of the second through hole 121 is less than or equal to the major axis of the rolling element 130, and the minor axis of the second through hole 121 is less than or equal to the major axis of the rolling element 130; alternatively, the major axis of the second through hole 121 is less than the major axis of the rolling element, and the minor axis of the second through hole is less than or equal to the major axis of the rolling element. This is not limited here, as long as the rolling element 130 can be constrained between the two protective covers 120.

[0045] Please continue to refer to Figure 1 、 Figure 2 and Figure 3 The protective cover 120 is fixed to the saw blade body 110 by laser welding or resistance welding, thereby achieving a fixed connection between the protective cover 120 and the saw blade body 110. Furthermore, if laser welding is adopted, the protective cover 120 is also provided with a welding hole 122 (such as Figure 2 As shown), but the present invention is not limited thereto.

[0046] In one embodiment, the material of the protective cover 120 is the same as that of the saw blade body 110, so that the protective cover 120 and the saw blade body 110 have the same mechanical properties. Optionally, the material of the saw blade body 110 and the protective cover 120 are both 17-4PH (martensitic precipitation hardening) stainless steel, but the present invention is not limited thereto.

[0047] Please continue to refer to Figure 1 The length of the protective cover 120 (i.e., the side length of the protective cover 120 in the X-axis direction) is smaller than the length of the saw blade body 110 (i.e., the side length of the saw blade body 110 in the X-axis direction). When the protective cover 120 is fixed to the saw blade body 110, a chip outlet 140 is formed between the protective cover 120 and the saw teeth 1101. Bone chips generated when the saw teeth 1101 cut the bone tissue can be discharged from the chip outlet 140, thereby avoiding bone chips from gathering at the saw teeth 1101, and further allowing the cutting heat generated when the saw teeth 1101 cut the bone tissue to be dissipated in time, so as to avoid the cutting heat generated by the saw teeth 1101 causing thermal damage to the bone tissue or bone cells. Optionally, the end of the protective cover 120 close to the saw tooth 1101 is arc-shaped or V-shaped, and the tip of the arc or V-shape is close to the saw tooth 1101, so as to facilitate the discharge of bone chips from both sides of the tip, thereby improving the discharge efficiency of bone chips and improving the heat dissipation efficiency of the saw tooth 1101, but the present invention is not limited to this.

[0048] In addition, in the prior art, Figure 4 As shown, when the staff uses the saw blade body to cut the bone tissue, when the staff controls the saw blade body to move in the Y-axis direction, the staff will inevitably move the saw blade body in the Z-axis direction. At this time, the staff's hand will indirectly add a constraint in the Z-axis direction to the saw blade body. This constraint, when superimposed on the constraint of the osteotomy plate 200 on the saw blade body in the Z-axis direction, will produce an over-constraint phenomenon, causing the pressure between the saw blade body and the osteotomy plate 200 to increase and generate greater friction, thereby generating more heat. In this embodiment, since the protective cover 120 and the rolling element 130 are provided on the saw blade body 110, the gap 201 in the osteotomy plate 200 remains unchanged. In order to ensure that the saw blade 100 can pass through the gap 201, the saw blade body 110 in this embodiment becomes thinner than the saw blade body in the prior art while ensuring that the cutting performance remains unchanged; in this case, the end of the saw blade body 110 away from the saw teeth 1101 in this embodiment can be formed or regarded as a spring sheet A (such as Figure 1 (as shown); during the process of using the saw blade body 110 to cut the bone tissue, the spring piece A can produce elastic deformation in the Z-axis direction, which can reduce the constraint imposed by the operator's hand on the saw blade body 110 in the Z-axis direction, thereby avoiding the phenomenon of over-constraint, and further reducing the pressure between the saw blade body 110 and the osteotomy plate 200, thereby reducing the friction between the saw blade body 110 and the osteotomy plate 200, and further reducing the generation of heat. In addition, the width of the saw blade body (i.e., the side length of the saw blade body in the Y-axis direction) is relatively wide, so the spring piece A is not easily deformed in the Y-axis direction, so that the saw blade body 110 can normally cut the bone tissue.

[0049] In another embodiment, an oscillating saw is provided, comprising: the saw blade 100 described above and a motor 310; the motor 310 is connected to the saw blade 100 and configured to drive the saw blade 100 to oscillate to cut bone tissue. Optionally, the oscillating saw further comprises a handle 320 fixedly connected to the motor 310; a worker can grip the handle 320 to cut bone tissue, thereby improving cutting efficiency. However, the present invention is not limited to this embodiment.

[0050] In summary, the present embodiment provides a saw blade and an oscillating saw, wherein the saw blade body is provided with a plurality of first through-holes, the protective cover is provided with second through-holes opposite the first through-holes, and a rolling element is rotatably fixed within the corresponding first and second through-holes. Part of the rolling surface of the rolling element passes through the first and second through-holes and protrudes beyond the surfaces of the saw blade body and the protective cover, thereby generating rolling friction between the rolling element and the object it contacts. In this embodiment, when the saw blade body is performing an operation of cutting bone tissue, the object of contact includes the osteotomy surface of the cut bone tissue. The provision of the rolling element can convert the sliding friction between the saw blade body and the osteotomy surface of the cut bone tissue, as in the prior art, into rolling friction, thereby effectively reducing the heat generated between the saw blade body and the osteotomy surface of the cut bone tissue, thereby preventing thermal damage to the bone tissue or bone cells, and thus ensuring the survival rate, service life, and performance of the joint prosthesis. In this embodiment, the rolling element can also convert the sliding friction between the saw blade body and the osteotomy plate, as in the prior art, into rolling friction, thereby effectively reducing the heat generated between the saw blade body and the osteotomy plate, thereby preventing deformation of the saw blade body due to heat, and thus ensuring the reliability of the saw blade. In addition, this embodiment can also prevent bone chips from gathering at the saw teeth and reduce the pressure between the saw blade body and the osteotomy plate.

[0051] Although the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description should not be considered as limiting the present invention. After reading the above description, various modifications and alternatives to the present invention will be readily apparent to those skilled in the art. Therefore, the scope of protection of the present invention shall be defined by the appended claims.

Claims

1. A saw blade, characterized in that: include: a saw blade body, wherein the saw blade body is provided with a plurality of first through holes; A plurality of rolling elements, each of the rolling elements being correspondingly disposed in the first through hole; as well as At least one protective cover, covering the outer side of the rolling element and fixedly connected to the saw blade body; the protective cover is provided with a second through hole opposite to the first through hole, and each of the rolling elements is rotatably fixed in the corresponding first through hole and the second through hole; Part of the rolling surface of the rolling element passes through the first through hole and the second through hole and protrudes from the surface of the saw blade body and the protective cover, so that rolling friction is generated between the rolling element and the contact object.

2. The saw blade according to claim 1, wherein: The number of the protective cover is one, and the second through hole on the protective cover cooperates with the first through hole on the saw blade body to fix the rolling element between the protective cover and the saw blade body.

3. The saw blade according to claim 1, wherein: There are two protective covers, and the saw blade body is located between the two protective covers; and the second through holes on the two protective covers cooperate with the first through holes on the saw blade body to fix the rolling element between the two protective covers.

4. The saw blade according to any one of claims 1 to 3, wherein: The rolling element is a sphere.

5. The saw blade according to any one of claims 1 to 3, characterized in that The rolling element is an ellipsoid, and the central axis of the rolling element during rotation is parallel to the surface where the saw blade body and / or the protective cover are located.

6. The saw blade according to claim 1, wherein: When the saw blade body performs an operation of cutting bone tissue, the contact object includes the osteotomy surface of the cut bone tissue.

7. The saw blade according to claim 6, wherein: An osteotomy plate is fixed on the bone tissue, and the osteotomy plate is provided with a slit for the saw blade to pass through; the contact object also includes an end surface of the slit.

8. The saw blade according to claim 7, wherein: In the thickness direction of the osteotomy plate, a distance between two adjacent rolling elements is greater than 1 / 3 of the thickness of the osteotomy plate and less than 2 / 3 of the thickness of the osteotomy plate.

9. The saw blade according to claim 1, wherein: The end of the saw blade body is provided with saw teeth, and a chip outlet is formed between the protective cover and the saw teeth.

10. An oscillating saw, characterized in that: include: The saw blade according to any one of claims 1 to 9; and a motor connected to the saw blade, for driving the saw blade to swing so as to cut bone tissue.

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