Medical swing saw

Abstract

The utility model relates to a medical swing saw, which comprises a handheld part, a swing saw blade and a swing saw blade, the transmission connecting part is arranged at the front end of the handheld part and is in transmission connection with the driving device; the saw blade comprises a saw blade body, a heat conduction piece, a cover plate and a refrigeration piece. The saw blade main body is mechanically connected with the transmission connecting part, and the heat conduction piece is embedded in a groove in the saw blade main body; the cover plate covers the heat conduction part and is fixedly connected with the saw blade main body; the refrigeration part is fixedly connected to the saw blade body and connected with the heat conduction part. According to the utility model, heat generated when the saw blade works can be effectively reduced.

Description

Technical Field

[0001] The utility model relates to the field of medical instruments, in particular to a medical oscillating saw. Background Art

[0002] During artificial joint replacement surgery, diseased or damaged joints are surgically removed. This involves the use of tools such as electric oscillating saws for osteotomy. The use of oscillating saws greatly facilitates surgical procedures. When cutting bone tissue with an oscillating saw, friction between the saw blade and the tissue generates significant heat, causing thermal damage to bone cells and tissue in contact with the blade. This can lead to failure of the joint prosthesis' bond with the remaining bone after implantation. This is particularly true for joint prostheses that utilize biological fixation, which severely impacts their lifespan and performance.

[0003] In order to increase the survival rate of artificial joint prostheses, reducing the heat generated during the cutting process of electric oscillating saws has become a key issue in artificial joint prosthesis replacement surgery.

[0004] The same problem is faced not only in joint orthopedics, but also in fields such as dentistry and spine that involve cutting of hard human tissues. Utility Model Content

[0005] In order to solve the above problems, the present invention aims to provide a medical oscillating saw with cooling function, which can be applied in fields such as joint orthopedics, dentistry and spinal medicine, and can reduce the heat generation of the saw blade when cutting hard tissue. The medical oscillating saw comprises:

[0006] A handheld portion, in which a driving device is provided;

[0007] A transmission connection portion, fixedly connected to the handheld portion and transmission-connected to the driving device;

[0008] The saw blade comprises a saw blade body, a heat conducting member, a cover plate and a cooling member;

[0009] The saw blade body is mechanically connected to the transmission connection part and is driven by the driving device to swing;

[0010] The heat conducting member is embedded in the saw blade body and can conduct away the heat generated by the saw blade when it is working, so as to reduce the temperature of the saw blade;

[0011] The cover plate covers the heat conducting member and is fixedly connected to the saw blade body, and is used to protect the heat conducting member and isolate the heat conducting member from human tissue. At the same time, the cover plate is fixedly connected to the saw blade body to enhance the stability of the overall structure.

[0012] The refrigeration component is fixedly connected to the saw blade body and connected to the heat conducting component, and is connected to the heat conducting component to further reduce the temperature of the saw blade through the refrigeration effect.

[0013] Furthermore, the saw blade body comprises:

[0014] a fixing portion connected to the transmission connection portion;

[0015] a groove, which is provided on the surface of the saw blade body and is used to accommodate the heat conducting member;

[0016] The elastic part is arranged between the fixing part and the groove, and is used to reduce the restraining force from the hand. Through the bending function of the elastic part, the contact pressure between the saw blade body and the osteotomy plate is reduced, thereby reducing the friction and further reducing the heat of the saw blade body.

[0017] Furthermore, the saw blade body includes teeth and a chip groove. The teeth are disposed at the end of the saw blade body away from the handle, and the surface of the chip groove is lower than the surface of the teeth. The front end of the chip groove begins at the root of the teeth and the rear end extends obliquely to both sides to form two chip outlets. The chip groove improves the removal of bone chips, keeps the cutting surface clean, reduces friction on the teeth, and thus reduces heat generation.

[0018] Furthermore, the saw blade body and the cover plate are both made of stainless steel, which has good biocompatibility with human tissue.

[0019] Furthermore, the elastic portion is realized by thinning the thickness of the corresponding area of ​​the saw blade body, which can reduce the weight of the saw blade body.

[0020] Furthermore, the heat conducting member is a hollow copper tube, which can further reduce the weight of the saw blade body.

[0021] Furthermore, the interior of the heat conducting member is filled with coolant.

[0022] Furthermore, the cooling element is a semiconductor cooling plate, which includes a cooling side and a heat dissipation side, the cooling side is connected to the heat conducting element, and the heat dissipation side is arranged away from the heat conducting element.

[0023] Furthermore, the cover plate does not completely cover the heat conducting element, and the uncovered portion is close to the handheld portion and is completely covered by the refrigeration element.

[0024] Compared with the prior art, the utility model has the following advantages:

[0025] The heat generated by the saw blade during operation can be effectively reduced by using the heat conducting parts and the cooling parts in combination;

[0026] The structural design of the elastic part reduces the pressure friction between the saw blade and the osteotomy plate, further reducing the generation of heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic structural diagram of the medical oscillating saw of the present utility model;

[0028] Figure 2 This is a three-dimensional assembly diagram of the saw blade of the utility model;

[0029] Figure 3 This is the assembly drawing of the saw blade of the utility model;

[0030] Figure 4 This is a structural diagram of the saw blade body of the utility model;

[0031] Figure 5 This is a schematic diagram of the structure of the refrigeration component of the utility model;

[0032] Figure 6 It is a structural schematic diagram of the saw teeth and chip grooves of the utility model. DETAILED DESCRIPTION

[0033] The following is a further detailed description of a medical 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 are not in 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 structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents 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 structural modification, change in proportional relationship or adjustment of 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.

[0034] There are three main sources of heat generated by a saw blade cutting bone. First, there's the friction between the saw blade and the bone surface being cut. Second, there's the friction between the saw teeth as they cut the bone, which is primarily concentrated in the teeth. Third, there's the friction between the saw blade and the osteotomy plate.

[0035] like Figure 1As shown, when performing transverse osteotomies with an oscillating saw, the longitudinal movement (perpendicular to the blade surface) of the saw blade 10 must be constrained by the stopper holes in the osteotomy plate 40, ensuring that the saw blade 10 moves only in the desired location and direction. However, due to manual grip, it is impossible to ensure that the saw blade 10 and the osteotomy plate 40 do not contact each other during cutting. Furthermore, the saw blade 10 is currently made of rigid materials, and this contact generates significant friction, which increases heat generation. Therefore, reducing the hand's restraining force on the longitudinal movement of the saw blade 10 can reduce friction between the saw blade 10 and the osteotomy plate 40, thereby reducing heat generation.

[0036] In order to reduce the heat generated by the friction between the oscillating saw and the hard tissue during use and to dissipate the heat of the oscillating saw, the present application provides a medical oscillating saw that can effectively reduce heat generation and has good heat dissipation performance. Figures 1 to 4 , the medical oscillating saw comprises:

[0037] The handheld portion 20 is provided with a driving device for providing power, and the driving device can be a motor;

[0038] The transmission connection part 30 is fixedly connected to the handheld part 20 and is in transmission connection with the driving device;

[0039] The saw blade 10 includes a saw blade body 101 , a heat conducting member 102 , a cover plate 103 and a cooling member 104 .

[0040] The saw blade body 101 is mechanically connected to the transmission connection part 30, which transmits the power of the drive device to the saw blade 10, controlling the high-frequency oscillation of the saw blade 10. The heat conducting member 102 is embedded in the groove 1015 on the saw blade body 101 and is used to conduct heat generated by the saw blade body 101. The cover plate 103 covers the heat conducting member 102 and is fixedly connected to the saw blade body 101, and is used to fix the heat conducting member 102 in the groove 1015. The cooling member 104 is fixedly connected to the saw blade body 101 and connected to the heat conducting member 102, and is used to cool the heat conducting member 102.

[0041] The saw blade body 101 and the cover plate 103 can both be made of stainless steel (the present invention is not limited to this material and can also be made of other thermally conductive materials). This material has good biocompatibility with human tissue, and the cover plate 103 can isolate the heat conductor 102 from human tissue. Therefore, the heat conductor 102 can be made of copper, which has poor biocompatibility but good thermal conductivity. When the oscillating saw is in use, the heat generated by the saw blade body 101 is transferred to the cooling element 104 through the heat conductor 102. The cooling element 104 then dissipates the heat into the air, thereby achieving cooling.

[0042] Furthermore, the heat conductor 102 is designed as a hollow copper tube (the present invention is not limited to this material and can also be other heat-conducting materials), the interior of which can be filled with coolant or not. The heat conductor 102 can reduce the weight of the saw blade 10 while maintaining efficient heat conduction. The heat conductor 102 can be U-shaped, elongated, or cylindrical, etc. If it is an elongated strip, it can be one or multiple strips. In order to enhance the heat conduction effect, the coverage area of ​​the heat conductor 102 can be increased or the heat conductor 102 can be provided on both the front and back sides of the saw blade body 101.

[0043] like Figure 5 As shown, the cooling element 104 is a semiconductor refrigeration chip, comprising a cooling side 1041 and a heat dissipation side 1042. The cooling side 1041 is connected to the heat conductive element 102 using bolts, glue, or snaps. The heat dissipation side 1042 is located away from the heat conductive element 102. The semiconductor refrigeration chip does not require any refrigerant, does not generate refrigerant pollution during operation, and can operate continuously without vibration or noise. The semiconductor refrigeration chip is connected to a power source via a lead wire 1043. When powered on, heat from the cooling side 1041 is transferred to the heat dissipation side 1042, causing the temperature of the cooling side 1041 to decrease while the temperature of the heat dissipation side 1042 increases. The heat from the heat dissipation side 1042 is then dissipated through the air. Furthermore, the cover 103 does not completely cover the heat conductive element 102. The uncovered portion is adjacent to the handheld portion 20 and is completely covered by the cooling side 1041 of the cooling element 104.

[0044] Furthermore, if Figure 4 As shown, one end of the saw blade body 101 is provided with a fixing portion 1011 for connecting to the transmission connection portion 30, and the other end opposite to the fixing portion 1011 is provided with saw teeth 1012, and the saw teeth 1012 are staggeredly distributed on the front and back sides of the saw blade body 101.

[0045] It has been verified that increasing the bone chip discharge rate can reduce the heat generated by the teeth. In order to quickly discharge bone chips and reduce the heat generated at the teeth 1012, the saw blade body 101 includes a chip groove 1013. The chip groove 1013 is set close to the root of the teeth 1012, one end of which starts at the root of the teeth 1012, and the other end is inclined and extended to both sides of the saw blade body 101 to form two chip outlets 1016. The surface of the chip groove 1013 is lower than the surface of the teeth 1012 to facilitate the discharge of bone chips. Figure 6As shown, the chip flutes 1013 extend from the chip outlets 1016 on either side toward the interior of the saw blade body 101, forming two wedge-shaped structures. The center of the chip flutes 1013 protrudes toward the saw teeth 1012, with the protruding portion forming a sharp arc. During operation, the saw blade body 101 oscillates back and forth laterally at a high frequency to cut bone tissue. The resulting bone chips are separated by the sharp arc-shaped protruding portion and discharged from the chip outlets 1016. The chip flutes 1013 can be provided on both the front and back sides of the saw blade body 101 to further improve the efficiency of bone chip removal.

[0046] When using the oscillating saw, the saw blade body 101 swings back and forth laterally at a high frequency under the drive of the driving device. The operator holds the hand-held part 20 and gives the saw blade 10 a thrust. At the same time, the hand also gives the saw blade 10 a longitudinal restraining force to prevent the saw blade 10 from shaking longitudinally. Since the longitudinal restraining force cannot be precisely controlled during operation, it is necessary to cooperate with the osteotomy plate 40 to further restrain the cutting position. When the saw blade 10 contacts the osteotomy plate 40, the longitudinal restraining force will be applied to the osteotomy plate 40, thereby generating a large friction force between the saw blade 10 and the osteotomy plate 40, which in turn causes the saw blade 10 to heat up severely. To solve this problem, the saw blade body 101 is also provided with an elastic part 1014, such as Figure 4 As shown, the elastic portion 1014 is arranged closely against the fixing portion 1011. The elastic portion 1014 is achieved by thinning the thickness of the corresponding area of ​​the saw blade body 101. In this example, the elastic portion 1014 is formed by grooving the surface of the saw blade body 101 and thinning the thickness to 0.3-0.4 mm. Due to the material properties of the saw blade body 101 itself, the thinned area has elasticity in the longitudinal direction. When the longitudinal restraining force is applied to the saw blade 10, due to the presence of the elastic portion 1014, the saw blade 10 will bend at the contact portion with the osteotomy plate 40 to reduce the pressure between the saw blade 10 and the osteotomy plate 40, thereby reducing the friction between the two and further reducing heat generation.

[0047] In some cases, when operating an oscillating saw, the operator cannot ensure that the saw blade 10 and the limiting holes on the osteotomy plate 40 are completely parallel. The saw blade 10 may tilt up or down (longitudinally), forming an oblique contact with the osteotomy plate 40 and generating friction. The more severe the tilt, the greater the friction and the more heat generated. The elastic portion 1014 can reduce the friction between the saw blade 10 and the osteotomy plate 40 in this situation. Specifically, the elastic portion 1014 allows the saw blade 10 to bend in the longitudinal direction. When the saw blade 10 and the osteotomy plate 40 are in oblique contact, the pressure between them causes the saw blade 10 to deform, thereby reducing the pressure between them. Unlike the longitudinal restraining force from the hand mentioned above, the force that deforms the saw blade 10 in this case mainly comes from the pressure of the osteotomy plate 40. The more the saw blade 10 tilts within the limiting hole of the osteotomy plate 40, the greater the deformation of the saw blade 10. The operator can adjust the grip angle in real time according to the deformation to correct the tilt angle.

[0048] In short, the elastic saw blade 10 can reduce the friction between the saw blade 10 and the osteotomy plate 40, thereby making osteotomy smoother and generating less heat.

[0049] Compared with the prior art, the utility model has the following advantages:

[0050] The heat generated by the saw blade during operation can be effectively reduced by using the heat conducting parts and the cooling parts in combination;

[0051] The structural design of the elastic part reduces the pressure friction between the saw blade and the osteotomy plate, further reducing the generation of heat.

[0052] 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 medical oscillating saw, characterized in that: include: A handheld portion, in which a driving device is provided; A transmission connection portion, fixedly connected to the handheld portion and transmission-connected to the driving device; The saw blade comprises a saw blade body, a heat conducting member, a cover plate and a cooling member; The saw blade body is mechanically connected to the transmission connection part and is driven by the driving device to swing; The heat conducting member is embedded in the saw blade body; The cover plate covers the heat conducting member and is fixedly connected to the saw blade body; The cooling element is fixedly connected to the saw blade body and is connected to the heat conducting element.

2. The medical oscillating saw according to claim 1, wherein: The saw blade body comprises: a fixing portion connected to the transmission connection portion; a groove, which is provided on the surface of the saw blade body and is used to accommodate the heat conducting member; The elastic portion is arranged between the fixing portion and the groove.

3. The medical oscillating saw according to claim 2, wherein: The saw blade body also includes saw teeth and a chip groove. The saw teeth are arranged at one end of the saw blade body away from the handheld part, and the surface of the chip groove is lower than the surface of the saw teeth. The front end of the chip groove starts at the root of the saw teeth, and the rear end is inclined and expanded to both sides to form two chip outlets.

4. The medical oscillating saw according to claim 2, wherein: The saw blade body and the cover plate are both made of stainless steel.

5. The medical oscillating saw according to claim 2, wherein: The elastic portion is realized by thinning the thickness of the corresponding area of ​​the saw blade body.

6. The medical oscillating saw according to claim 1, wherein: The heat conducting member is a hollow copper tube.

7. The medical oscillating saw according to claim 1, wherein: The interior of the heat conducting member is filled with coolant.

8. The medical oscillating saw according to claim 1, wherein: The cooling element is a semiconductor cooling plate, which includes a cooling side and a heat dissipation side. The cooling side is connected to the heat conducting element, and the heat dissipation side is arranged away from the heat conducting element.

9. The medical oscillating saw according to claim 1, wherein: The cover plate does not completely cover the heat conducting component, and the uncovered portion is close to the handheld portion and is completely covered by the refrigeration component.

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