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 fixed on the handheld part and is in transmission connection with the driving device; the saw blade comprises a saw blade main body, a cooling flow channel and a cover plate; the saw blade main body is mechanically connected with the transmission connecting part and is driven by the driving device to swing; the cooling flow channel is arranged on the surface of the saw blade main body and is covered by the cover plate, and the cooling flow channel is filled with a cooling medium; the cover plate is connected with the saw blade body in a sealed mode, and an outlet and an inlet which are communicated with the cooling flow channel are formed in the surface of the cover plate. The circulating refrigeration module is connected with the outlet and the inlet; and the cooling medium enters the circulating refrigeration module through the outlet to be cooled, and then enters the cooling flow channel again from the inlet. The heat dissipation efficiency of the saw blade is enhanced through the circulating refrigeration module.

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 surgery, and can reduce the heat generated by 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, which is fixed to the handheld portion and is transmission-connected to the driving device;

[0008] The saw blade comprises a saw blade body, a cooling channel, and a cover plate; the saw blade body is mechanically connected to the transmission connection portion and is driven by the drive device to swing; the cooling channel is provided on the surface of the saw blade body and covered by the cover plate, and the cooling channel is filled with a cooling medium; the cover plate is sealed to the saw blade body, and an outlet and an inlet communicating with the cooling channel are provided on the surface of the cover plate;

[0009] A circulating refrigeration module is connected to the outlet and the inlet; the cooling medium enters the circulating refrigeration module through the outlet for cooling and then re-enters the cooling channel through the inlet. By providing a recyclable cooling medium, the heat generated by the saw blade during operation can be conducted away to reduce the temperature of the saw blade. The cover plate is sealed to the saw blade body to prevent leakage of the cooling medium. Further, the circulating refrigeration module includes:

[0010] a circulation pipeline, one end of which is connected to the outlet and the other end of which is connected to the inlet;

[0011] A pump, a radiator and a refrigerator, wherein the pump, the radiator and the refrigerator are connected through the circulation pipeline, and the radiator is close to the outlet side, and the refrigerator is close to the inlet side.

[0012] Furthermore, the cooling channel is designed as a "U"-shaped loop, passing through the saw blade head end, which can increase the coverage area of ​​the cooling medium and enhance the heat dissipation efficiency of the saw blade head end.

[0013] Furthermore, the cooling channel passes through the entire saw blade body, further increasing the contact area between the cooling medium and the saw blade body, thereby increasing heat dissipation efficiency.

[0014] Furthermore, the cooling medium is physiological saline or other medical fluids.

[0015] Furthermore, the outlet and the inlet are both arranged at one end of the cover plate close to the handheld part.

[0016] Furthermore, the cover plate is connected to the saw blade body by welding.

[0017] Compared with the prior art, the utility model has the following advantages:

[0018] Through the heat dissipation of the circulating refrigeration module, the heat generated by the saw blade during operation is effectively reduced;

[0019] The "U"-shaped cooling channel design further enhances the heat dissipation efficiency of the saw blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of the medical oscillating saw of the present utility model;

[0021] Figure 2 This is a three-dimensional assembly diagram of the saw blade of the utility model;

[0022] Figure 3 This is a schematic diagram of the connection between the saw blade and the refrigeration module of the utility model;

[0023] Figure 4 This is a structural diagram of the saw blade body of the utility model;

[0024] Figure 5 It is a structural schematic diagram of the saw teeth and chip grooves of the utility model. DETAILED DESCRIPTION

[0025] 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.

[0026] 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.

[0027] like Figure 1 As shown, when performing transverse osteotomies with an oscillating saw, the longitudinal (perpendicular to the blade surface) movement of the saw blade 10 needs to be constrained by the stopper holes in the osteotomy plate 40, ensuring that the saw blade 10 oscillates only at the desired osteotomy location. 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 force exerted by the hand on the longitudinal movement of the saw blade can reduce friction between the saw blade 10 and the osteotomy plate 40, thereby reducing heat generation.

[0028] In order to reduce the frictional heat generated by an oscillating saw when cutting hard tissue and to dissipate heat from the oscillating saw, the present application provides a medical oscillating saw that can effectively reduce heat generation and has excellent heat dissipation performance.

[0029] See also Figures 1 to 3 , the medical oscillating saw comprises:

[0030] The handheld portion 20 is provided with a driving device for providing power, and the driving device can be a motor;

[0031] The transmission connection part 30 is fixedly connected to the handheld part 20 and is in transmission connection with the driving device;

[0032] The saw blade 10 includes a saw blade body 101, a cooling channel 102, and a cover plate 103. The saw blade body 101 is mechanically connected to the transmission connection portion 30 and is driven by the drive device to oscillate at a high frequency. The cooling channel 102 is provided on the surface of the saw blade body 101 and covered by the cover plate 103. The cooling channel 102 is filled with a cooling medium. The cover plate 103 is sealed to the saw blade body 101, which may be connected by welding. The surface of the cover plate 103 is provided with an outlet 1031 and an inlet 1032 that communicate with the cooling channel 102. The cooling medium is discharged from the outlet 1031 and enters the cooling channel through the inlet 1032. The cooling medium can be either gas or liquid.

[0033] The circulating refrigeration module is connected to the outlet 1031 and the inlet 1032 ; the cooling medium enters the circulating refrigeration module through the outlet 1031 to be cooled, and then re-enters the cooling channel from the inlet 1032 .

[0034] Among them, the saw blade body 101 and the cover plate 103 can be made of stainless steel, but are not limited to this material. This material has good biocompatibility with human tissue. The cover plate 103 can seal the cooling medium in the cooling channel to prevent leakage of the cooling medium. Before the oscillating saw is started, the circulating cooling module can be turned on in advance to cool the cooling medium. After the temperature of the cooling medium drops, the oscillating saw is used to cut bone tissue. The heat generated by the saw blade body 101 can be carried away by the circulating flow of the cooling medium, and the cooling medium is cooled by the circulating refrigeration module for reuse.

[0035] like Figure 3 As shown, the circulating refrigeration module includes: a circulating pipeline, a pump 501, a radiator 502, and a refrigerator 503. The pump 501, the radiator 502, and the refrigerator 503 are connected via the circulating pipeline. One end of the circulating pipeline is connected to the outlet 1031, and the other end is connected to the inlet 1032. Furthermore, the radiator 502 is located near the outlet 1031, and the refrigerator 503 is located near the inlet 1032. In this example, the input end of the pump 501 is directly connected to the outlet 1031 via the circulating pipeline, the output end of the pump 501 is connected to the input end of the radiator 502 via the circulating pipeline, the output end of the radiator 502 is connected to the input end of the refrigerator 503, and the output end of the refrigerator 503 is connected to the inlet 1032. After the cooling medium is pumped into the radiator 502 by the pump 501, it undergoes primary heat dissipation through the radiator 502 and then enters the refrigerator 503 for cooling. The cooled cooling medium re-enters the cooling channel 102 to dissipate heat for the saw blade 10, completing the recycling process.

[0036] 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.

[0037] Furthermore, if Figure 4 As shown, the cooling channel 102 is designed as a "U"-shaped loop, passing through the saw blade head end, and the cooling channel passes through the entire saw blade body. The "U"-shaped bottom of the "U"-shaped cooling channel passes through the saw blade head end (the end close to the saw teeth 1012). The "U"-shaped bottom can increase the coverage area of ​​the cooling medium and enhance the heat dissipation efficiency of the saw blade head end. The vertical section of the "U" shape passes through the entire saw blade body 101, and the open ends of the vertical section are respectively connected to the outlet 1031 and the inlet 1032. This design can increase the contact area between the cooling medium and the saw blade body, further increasing the heat dissipation efficiency.

[0038] Furthermore, the cooling medium is physiological saline or other medical fluids. It has been verified that increasing the bone chip discharge rate can reduce the heat generated by the saw teeth. In order to quickly discharge bone chips, such as Figure 4 As shown, the saw blade body 101 includes a chip groove 1013. The chip groove 1013 is set close to the root of the saw tooth 1012, one end of which starts from the root of the saw tooth 1012, and the other end extends obliquely 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 saw tooth 1012 to facilitate the discharge of bone chips. Figure 5 As 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] Compared with the prior art, the utility model has the following advantages:

[0043] Through the heat dissipation of the circulating refrigeration module, the heat generated by the saw blade during operation is effectively reduced;

[0044] The "U"-shaped cooling channel design further enhances the heat dissipation efficiency of the saw blade; the structural design of the elastic part reduces the pressure friction between the saw blade and the osteotomy plate, further reducing heat generation.

[0045] 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, which is fixed to the handheld portion and is transmission-connected to the driving device; The saw blade comprises a saw blade body, a cooling channel, and a cover plate; the saw blade body is mechanically connected to the transmission connection portion and is driven by the drive device to swing; the cooling channel is provided on the surface of the saw blade body and covered by the cover plate, and the cooling channel is filled with a cooling medium; the cover plate is sealed to the saw blade body, and an outlet and an inlet communicating with the cooling channel are provided on the surface of the cover plate; A circulating refrigeration module is connected to the outlet and the inlet; the cooling medium enters the circulating refrigeration module through the outlet to be cooled, and then re-enters the cooling flow channel from the inlet.

2. The medical oscillating saw according to claim 1, wherein: The circulating refrigeration module comprises: a circulation pipeline, one end of which is connected to the outlet and the other end of which is connected to the inlet; A pump, a radiator and a refrigerator, wherein the pump, the radiator and the refrigerator are connected through the circulation pipeline, and the radiator is close to the outlet side, and the refrigerator is close to the inlet side.

3. The medical oscillating saw according to claim 1, wherein: The cooling channel is designed as a "U"-shaped loop and passes through the head end of the saw blade.

4. The medical oscillating saw according to claim 3, wherein: The cooling channel passes through the entire saw blade body.

5. The medical oscillating saw according to claim 1, wherein: The cooling medium is physiological saline or other medical fluids.

6. The medical oscillating saw according to claim 1, wherein: The outlet and the inlet are both arranged on one end of the cover plate close to the handheld part.

7. The medical oscillating saw according to claim 1, wherein: The cover plate is connected to the saw blade body by welding.

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