A saw blade quick-install structure for medical reciprocating saw

Abstract

The present invention belongs to the technical field of medical reciprocating saws, and specifically relates to a saw blade quick-installation structure of a medical reciprocating saw. In view of the shortcomings of the inconvenience of disassembling and assembling the saw blade of the existing medical reciprocating saw or the unreliable fixation of the saw blade, the present invention adopts the following technical scheme: a saw blade quick-installation structure of a medical reciprocating saw, comprising: a reciprocating saw blade, including a cutting portion, a radial positioning portion and an axial anti-slip portion; an inner cylinder, including a radial positioning groove, an axial receiving groove, an arc groove and a circumferential positioning groove; an outer cylinder, rotatably sleeved on the outside of the inner cylinder, including a center hole, an edge groove and a radial step hole; a top pin; and an elastic member. The beneficial effects of the saw blade quick-installation structure of the medical reciprocating saw of the present invention are: the reciprocating saw blade can be disassembled and assembled by simply rotating the outer cylinder, which is easy to operate; the top pin and the elastic member can effectively ensure that the outer cylinder will not rotate when not subjected to external force, thereby ensuring that the reciprocating saw blade will not fall out.

Description

Technical Field

[0001] The invention belongs to the technical field of medical reciprocating saws, and in particular relates to a saw blade quick-installation structure of a medical reciprocating saw. Background Art

[0002] The medical reciprocating saw is a common surgical device in orthopedics, including a main unit and a saw head. The saw head includes a rotating connecting piece, a reciprocating rod and a saw blade. The saw blade is connected to the reciprocating rod. The rotating connecting piece rotates when driven by a motor. The rotating connecting piece drives the reciprocating rod to perform reciprocating motion through transmission components such as a bevel gear set, thereby driving the saw blade to perform reciprocating motion to cut bone tissue.

[0003] During surgery, it is sometimes necessary to quickly replace the saw blade. Therefore, the saw blade of existing medical reciprocating saws is usually detachably connected. In the prior art, the saw blade usually uses a spring and a locking pin to compress / release the spring by pressing, thereby driving the locking pin to move and switch the locking / unlocking state of the saw blade. However, this method uses the elasticity of the spring itself to keep the saw blade locked, which is extremely dependent on the spring, and is inconvenient to assemble and maintain. The spring is difficult to make, and there is a risk that the spring will fall into the gap of the reciprocating rod. After pressing, the pressing mechanism and the locking pin will not reset, resulting in instability in the locking / release of the saw blade, affecting the normal operation. In addition, during the replacement of the saw blade of some medical reciprocating saws, tools such as chuck keys are required, which is not only inconvenient to operate, but also not conducive to the surgeon to grasp the degree of tightening. Summary of the invention

[0004] The present invention aims to solve the problem that the saw blade of the existing medical reciprocating saw is inconvenient to disassemble or the saw blade is not fixed reliably, and provides a saw blade quick-installation structure for the medical reciprocating saw to achieve quick installation of the saw blade. Furthermore, the saw blade is reliably fixed and safe to use.

[0005] To achieve the above object, the present invention adopts the following technical solution: a saw blade quick-installation structure for a medical reciprocating saw, the saw blade quick-installation structure for a medical reciprocating saw comprising:

[0006] A reciprocating saw blade, comprising a cutting portion and a radial positioning portion, wherein an axial anti-slip portion is formed between the cutting portion and the radial positioning portion and radially extends outwardly;

[0007] The inner cylinder comprises a first cylinder body, the first cylinder body is provided with a radial positioning groove matched with the radial positioning portion and an axial receiving groove accommodating the axial anti-slip portion, an arc groove is further formed on the outer surface of the first cylinder, and at least one end of the arc groove is radially inwardly formed into a circumferential positioning groove;

[0008] The outer cylinder is rotatably sleeved outside the inner cylinder and switched between a disassembly position and a working position by rotation, and comprises a second cylinder body, the second cylinder body is provided with a center hole for the radial positioning part of the reciprocating saw blade to pass through and an edge groove for the axial anti-slip part of the reciprocating saw blade to pass through, the radial size of the center hole is smaller than the axial anti-slip part of the reciprocating saw blade, and the second cylinder body is provided with a radial step hole;

[0009] A top nail is arranged in the radial step hole, comprising a small diameter portion at an inner end and a large diameter portion at an outer end, wherein the small diameter portion at the inner end of the top nail passes through the radial step hole and enters the arc-shaped groove of the inner tube;

[0010] An elastic member, generating a radially inward force on the top nail;

[0011] When the outer cylinder is in the disassembly position, the edge groove of the second cylinder body of the outer cylinder and the axial projection of the axial receiving groove of the first cylinder body of the inner cylinder at least partially overlap, so that the reciprocating saw blade can move in and out;

[0012] When the outer cylinder is in the working position, the edge groove of the second cylinder body of the outer cylinder is staggered with the axial accommodating groove of the first cylinder body of the inner cylinder, and the outer cylinder restricts the axial anti-slip portion of the reciprocating saw blade to prevent the reciprocating saw blade from slipping out. At the same time, the top pin is positioned in the circumferential positioning groove under the action of the elastic member.

[0013] The saw blade quick-installation structure of the medical reciprocating saw of the present invention comprises a reciprocating saw blade, an inner cylinder, an outer cylinder, a top nail and an elastic member. When the outer cylinder is in the disassembly position, the edge groove of the second cylinder body of the outer cylinder and the axial projection of the axial receiving groove of the first cylinder body of the inner cylinder at least partially overlap, and the reciprocating saw blade can move in and out. When the outer cylinder is in the working position, the edge groove of the second cylinder body of the outer cylinder and the axial receiving groove of the first cylinder body of the inner cylinder are staggered, and the outer cylinder restricts the axial anti-slipping part of the reciprocating saw blade to prevent the reciprocating saw blade from slipping out. At the same time, the top nail is positioned in the circumferential positioning groove under the action of the elastic member. When the saw blade needs to be installed , it is only necessary to rotate the outer cylinder in the first direction to align the edge groove of the outer cylinder with the axial receiving groove of the inner cylinder, and the saw blade can be inserted into the inner cylinder along the axial direction. After the saw blade is inserted into place, the outer cylinder is rotated to make the top nail reach the circumferential positioning groove along the arc groove, and the inner end of the top nail enters the circumferential positioning groove under the action of the elastic member, that is, it is installed in place; when the saw blade needs to be removed, it is only necessary to rotate the outer cylinder in the second direction to overcome the force of the elastic member, so that the top nail moves out of the circumferential positioning groove and reaches the other end of the arc groove along the arc groove. At this time, the edge groove of the outer cylinder is aligned with the axial receiving groove of the inner cylinder, and the saw blade can be removed axially.

[0014] As an improvement, the first cylinder body of the inner cylinder also extends radially outward to form an axial force-bearing ear, and the second cylinder body of the outer cylinder is provided with an axial force-bearing groove that cooperates with the axial force-bearing ear. When the axial force-bearing ear and the axial force-bearing groove are not provided, and the transmission of the axial force between the inner cylinder and the outer cylinder is realized by the top pin and the arc groove of the inner cylinder, it is found after a period of use that the arc groove of the inner cylinder forms a permanent axial groove under the long-term action of the top pin, and the groove makes it difficult for the outer cylinder to rotate. By forming the axial force-bearing ear on the inner cylinder and the axial force-bearing groove on the outer cylinder, the axial force is borne by the axial force-bearing ear and the axial force-bearing groove instead of the top pin and the arc groove of the inner cylinder, thereby preventing the deformation of the arc groove of the inner cylinder. After actual verification, it is proved that after the axial force-bearing ear and the axial force-bearing groove are provided, the arc groove of the inner cylinder does not undergo obvious deformation.

[0015] As an improvement, the fitting clearance between the axial force groove and the axial force ear is smaller than the fitting clearance between the top pin and the arc groove to ensure that the transmission of axial force between the inner tube and the outer tube is achieved by the axial force groove and the axial force ear.

[0016] As an improvement, the axial force-bearing groove is a 360° arc groove: an ear groove for the axial force-bearing ear to pass through is formed at one end of the second cylinder body of the outer cylinder away from the reciprocating saw blade; and the axial force-bearing ears are provided in pair.

[0017] As an improvement, the axial dimension of the axial accommodating groove of the first cylinder body of the inner cylinder is adapted to the axial dimension of the axial anti-slip portion of the reciprocating saw blade. When the reciprocating saw blade is installed into the inner cylinder, the axial accommodating groove limits the inner end position of the axial anti-slip portion of the reciprocating saw blade to ensure that the reciprocating saw blade is installed in a suitable position.

[0018] As an improvement, the outer cylinder rotates back and forth, and the rotation angle of the outer cylinder is 90°; there is a pair of axial anti-slip portions and axial accommodating grooves; there are two of each of the top pin, the arc groove, and the elastic member; both ends of the arc groove form circumferential positioning grooves radially inward; the circumferential positioning grooves are spherical grooves.

[0019] As an improvement, the outer cylinder includes a small hole section close to the reciprocating saw blade and a large hole section away from the reciprocating saw blade, and the aperture of the small hole section is smaller than the end size of the inner cylinder close to one end of the reciprocating saw blade.

[0020] As an improvement, the inner tube is provided with an anti-rotation groove for connecting to the reciprocating rod of the medical reciprocating saw, and the side wall of the anti-rotation groove is also provided with a rivet hole, in which a rivet is provided, and the inner tube is fixedly connected to the reciprocating rod through the rivet, and the outer tube is provided with a hole for the rivet to pass through.

[0021] As an improvement, the saw blade quick-installation structure of the medical reciprocating saw further includes an outer sleeve arranged outside the outer cylinder, and the outer end of the elastic member abuts against the outer sleeve.

[0022] As an improvement, a mounting groove for positioning the elastic member is provided on the inner side of the outer sleeve, and a process hole for machining the mounting groove is provided on the outer side of the outer sleeve; the elastic member is a compression spring.

[0023] The beneficial effects of the saw blade quick-installation structure of the medical reciprocating saw of the present invention are: the reciprocating saw blade can be disassembled and assembled by simply rotating the outer cylinder, which is easy to operate; the top nail and the elastic member can effectively ensure that the outer cylinder will not rotate when no external force is applied, ensuring that the reciprocating saw blade will not fall out. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the saw head of the medical reciprocating saw according to the first embodiment of the present invention (when the outer cylinder is in the working position).

[0025] Figure 2 It is a cross-sectional view of the saw head of the medical reciprocating saw according to the first embodiment of the present invention (when the outer cylinder is in the working position, only a part of the reciprocating saw blade is shown).

[0026] Figure 3 It is a structural exploded view of the saw head of the medical reciprocating saw according to the first embodiment of the present invention.

[0027] Figure 4 It is a schematic structural diagram of a reciprocating saw blade of a medical reciprocating saw according to the first embodiment of the present invention.

[0028] Figure 5 and Figure 6 Schematic diagram of the structure of the inner cylinder of the medical reciprocating saw at different angles according to the first embodiment of the present invention.

[0029] Figure 7 and Figure 8 Schematic diagram of the structure of the outer cylinder of the medical reciprocating saw at different angles according to the first embodiment of the present invention.

[0030] Fig. 9 It is a schematic structural diagram of the outer cover of the medical reciprocating saw according to the first embodiment of the present invention.

[0031] In the figure, 1, reciprocating saw blade; 11, cutting part; 12, radial positioning part; 13, axial anti-slip part;

[0032] 2. Inner cylinder; 21. First cylinder; 22. Radial positioning groove; 23. Axial accommodation groove; 24. Arc groove; 25. Circumferential positioning groove; 26. Axial force ear; 27. Anti-rotation groove;

[0033] 3. outer cylinder; 31. second cylinder; 32. center hole; 33. edge groove; 34. radial step hole; 35. ear groove; 36. axial force groove;

[0034] 4. Top nail;

[0035] 5. Elastic parts;

[0036] 6. Jacket; 61. Mounting slot; 62. Process hole;

[0037] 7. Rivets. DETAILED DESCRIPTION

[0038] The following is an explanation and description of the technical solutions of the embodiments of the present invention in conjunction with the accompanying drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the protection scope of the present invention.

[0039] See also Figures 1 to 9 The present invention provides a saw blade quick-installation structure for a medical reciprocating saw, the saw blade quick-installation structure for the medical reciprocating saw comprising:

[0040] A reciprocating saw blade, comprising a cutting portion and a radial positioning portion, wherein an axial anti-slip portion is formed between the cutting portion and the radial positioning portion and radially extends outwardly;

[0041] The inner cylinder comprises a first cylinder body, the first cylinder body is provided with a radial positioning groove matched with the radial positioning portion and an axial receiving groove accommodating the axial anti-slip portion, an arc groove is further formed on the outer surface of the first cylinder body, and at least one end of the arc groove is radially inwardly formed into a circumferential positioning groove;

[0042] The outer cylinder is rotatably sleeved outside the inner cylinder and switched between a disassembly position and a working position by rotation, and comprises a second cylinder body, the second cylinder body is provided with a center hole for the radial positioning part of the reciprocating saw blade to pass through and an edge groove for the axial anti-slip part of the reciprocating saw blade to pass through, the radial size of the center hole is smaller than the axial anti-slip part of the reciprocating saw blade, and the second cylinder body is provided with a radial step hole;

[0043] A top nail is arranged in the radial step hole, comprising a small diameter portion at an inner end and a large diameter portion at an outer end, wherein the small diameter portion at the inner end of the top nail passes through the radial step hole and enters the arc groove of the inner tube;

[0044] An elastic member, generating a radially inward force on the top nail;

[0045] When the outer cylinder is in the disassembly position, the edge groove of the second cylinder body of the outer cylinder and the axial projection of the axial receiving groove of the first cylinder body of the inner cylinder at least partially overlap, so that the reciprocating saw blade can move radially;

[0046] When the outer cylinder is in the working position, the edge groove of the second cylinder body of the outer cylinder is staggered with the axial accommodating groove of the first cylinder body of the inner cylinder, and the outer cylinder limits the axial displacement of the axial anti-detachment portion of the reciprocating saw blade to prevent the reciprocating saw blade from escaping. At the same time, the top pin is positioned in the circumferential positioning groove under the action of the elastic member.

[0047] The saw blade quick-installation structure of the medical reciprocating saw of the present invention comprises a reciprocating saw blade, an inner cylinder, an outer cylinder, a top nail and an elastic member. When the outer cylinder is in the disassembly position, the edge groove of the second cylinder body of the outer cylinder and the axial projection of the axial receiving groove of the first cylinder body of the inner cylinder at least partially overlap, and the reciprocating saw blade can move in and out. When the outer cylinder is in the working position, the edge groove of the second cylinder body of the outer cylinder and the axial receiving groove of the first cylinder body of the inner cylinder are staggered, and the outer cylinder restricts the axial anti-slipping part of the reciprocating saw blade to prevent the reciprocating saw blade from slipping out. At the same time, the top nail is positioned in the circumferential positioning groove under the action of the elastic member. When the saw blade needs to be installed , it is only necessary to rotate the outer cylinder in the first direction to align the edge groove of the outer cylinder with the axial receiving groove of the inner cylinder, and the saw blade can be inserted into the inner cylinder along the axial direction. After the saw blade is inserted into place, the outer cylinder is rotated to make the top nail reach the circumferential positioning groove along the arc groove, and the inner end of the top nail enters the circumferential positioning groove under the action of the elastic member, that is, it is installed in place; when the saw blade needs to be removed, it is only necessary to rotate the outer cylinder in the second direction to overcome the force of the elastic member, so that the top nail moves out of the circumferential positioning groove and reaches the other end of the arc groove along the arc groove. At this time, the edge groove of the outer cylinder is aligned with the axial receiving groove of the inner cylinder, and the saw blade can be removed axially.

[0048] Embodiment 1

[0049] See also Figures 1 to 9 , a saw blade quick-installation structure of a medical reciprocating saw according to a first embodiment of the present invention, the saw blade quick-installation structure of the medical reciprocating saw comprises:

[0050] The reciprocating saw blade 1 comprises a cutting portion 11 and a radial positioning portion 12. An axial anti-slipping portion 13 is radially extended outward between the cutting portion 11 and the radial positioning portion 12. The axial anti-slipping portion 13 protrudes outward from the radial positioning portion 12, and the width of the axial anti-slipping portion 13 is greater than that of the radial positioning portion 12.

[0051] The inner cylinder 2 comprises a first cylinder body 21, on which a radial positioning groove 22 matching the radial positioning portion 12 and an axial receiving groove 23 for receiving the axial anti-slip portion 13 are formed. An arc groove 24 is also formed on the outer surface of the first cylinder body 21, and at least one end of the arc groove 24 forms a circumferential positioning groove 25 radially inwardly. The radial positioning groove 22 is adapted to the width and thickness of the radial positioning portion 12, so as to limit the radial movement of the radial positioning portion 12 and also limit the rotation of the radial positioning portion 12.

[0052] The outer cylinder 3 is rotatably sleeved outside the inner cylinder 2 and can be switched between the disassembly position and the working position by rotation, and includes a second cylinder body 31, the second cylinder body 31 is provided with a center hole 32 for the radial positioning portion 12 of the reciprocating saw blade 1 to pass through and an edge groove 33 for the axial anti-slip portion 13 of the reciprocating saw blade 1 to pass through, the radial size of the center hole 32 is smaller than the axial anti-slip portion 13 of the reciprocating saw blade 1, and the second cylinder body 31 is provided with a radial step hole 34;

[0053] The top nail 4 is arranged in the radial step hole 34, including a small diameter portion at the inner end and a large diameter portion at the outer end. The small diameter portion at the inner end of the top nail 4 passes through the radial step hole 34 and enters the circumferential positioning groove 25 of the inner tube 2;

[0054] The elastic member 5 generates a radially inward force on the top nail 4;

[0055] When the outer cylinder 3 is in the disassembly position, the edge groove 33 of the second cylinder body 31 of the outer cylinder 3 and the axial projection of the axial receiving groove 23 of the first cylinder body 21 of the inner cylinder 2 at least partially overlap, so that the reciprocating saw blade 1 can move in and out;

[0056] When the outer cylinder 3 is in the working position, the edge groove 33 of the second cylinder body 31 of the outer cylinder 3 is staggered with the axial accommodating groove 23 of the first cylinder body 21 of the inner cylinder 2, and the outer cylinder 3 restricts the axial anti-slip portion 13 of the reciprocating saw blade 1 to prevent the reciprocating saw blade 1 from slipping out. At the same time, the top nail 4 is positioned in the circumferential positioning groove 25 under the action of the elastic member 5.

[0057] The radial depth of the circumferential positioning groove 25 is greater than that of the arc groove 24, and the elastic member 5 can produce elastic deformation. When the outer cylinder 3 is rotated, the elastic member 5 is further compressed, and the top nail 4 can be moved out of the circumferential positioning groove 25, so that the outer cylinder 3, the top nail 4, and the elastic member 5 can rotate as a whole.

[0058] In this embodiment, the first cylinder body 21 of the inner cylinder 2 further extends radially outward to form an axial force-bearing ear 26, and the second cylinder body 31 of the outer cylinder 3 is provided with an axial force-bearing groove 36 that cooperates with the axial force-bearing ear 26. When the axial force-bearing ear 26 and the axial force-bearing groove 36 are not provided, and the transmission of the axial force between the inner cylinder 2 and the outer cylinder 3 is realized by the top pin 4 and the arc-shaped groove 24 of the inner cylinder 2, it is found after a period of use that the arc-shaped groove 24 of the inner cylinder 2 forms an axial permanent groove under the long-term action of the top pin 4, and the groove makes it difficult for the outer cylinder 3 to rotate. By forming the axial force-bearing ear 26 on the inner cylinder 2 and the axial force-bearing groove 36 on the outer cylinder 3, the axial force is borne by the axial force-bearing ear 26 and the axial force-bearing groove 36 instead of the top pin 4 and the arc-shaped groove 24 of the inner cylinder 2, thereby preventing the arc-shaped groove 24 of the inner cylinder 2 from deforming. Practical verification has shown that after the axial force-bearing ears 26 and the axial force-bearing grooves 36 are provided, the arc grooves 24 of the inner tube 2 do not undergo obvious deformation.

[0059] In this embodiment, the fitting clearance between the axial force groove 36 and the axial force ear 26 is smaller than the fitting clearance between the top pin 4 and the arc groove 24, that is, no matter which axial end of the axial force ear 26 abuts against the side wall of the axial force groove 36, there is a gap between the top pin 4 and the side wall of the arc groove 24 of the inner tube 2, so as to ensure that the transmission of the axial force between the inner tube 2 and the outer tube 3 is realized by the axial force groove 36 and the axial force ear 26, and the top pin 4 and the arc groove 24 do not bear or hardly bear axial force.

[0060] In this embodiment, the axial force bearing groove 36 is a 360° arc groove.

[0061] In this embodiment, an ear groove 35 for the axial force-bearing ear 26 to pass through is formed at one end of the second cylinder body 31 of the outer cylinder 3 away from the reciprocating saw blade 1 .

[0062] In this embodiment, there is a pair of axial force-bearing ears 26 to ensure uniform force transmission between the inner tube 2 and the outer tube 3 .

[0063] In this embodiment, the axial dimension of the axial accommodating groove 23 of the first cylinder body 21 of the inner cylinder 2 is adapted to the axial dimension of the axial anti-slip portion 13 of the reciprocating saw blade 1. When the reciprocating saw blade 1 is installed into the inner cylinder 2, the axial accommodating groove 23 limits the inner end position of the axial anti-slip portion 13 of the reciprocating saw blade 1 to ensure that the installation position of the reciprocating saw blade 1 is appropriate.

[0064] In this embodiment, the front end of the axial receiving groove 23 is chamfered so that the reciprocating saw blade 1 can be inserted more easily.

[0065] In this embodiment, the outer cylinder 3 switches between the disassembly position and the working position by reciprocating rotation.

[0066] In this embodiment, the rotation angle of the outer cylinder 3 is 90°. Since the inner cylinder 2 and the reciprocating rod are fixedly connected by rivets 7, the rotation angle of the outer cylinder 3 is 90°, which does not affect the detachability of the rivets 7.

[0067] In other embodiments, when the fixed connection between the inner cylinder 2 and the reciprocating rod adopts other structures, the outer cylinder 3 can also adopt a 360° rotating structure, that is, the arc groove 24 on the inner cylinder 2 is a 360° circular groove.

[0068] In this embodiment, the outer cylinder 3 has a small diameter section and a large diameter section, the large diameter section is farther away from the reciprocating saw blade 1 than the small diameter section, the top nail 4 is arranged in the large diameter section, the large diameter section has a hole for the rivet 7 to pass through, and the large diameter section has an ear groove 35 and an axial force groove 36.

[0069] In this embodiment, there is a pair of the axial anti-slip portion 13 and the axial accommodating groove 23 so that the reciprocating saw blade 1 and the inner cylinder 2 are evenly stressed.

[0070] In this embodiment, there are two of each of the top pin 4, the arc-shaped groove 24, and the elastic member 5, so that the forces are evenly applied between the components.

[0071] In this embodiment, both ends of the arc-shaped groove 24 form circumferential positioning grooves 25 radially inward, so that the outer cylinder 3 will not rotate easily when in the disassembly position, which facilitates the disassembly and assembly of the reciprocating saw blade 1.

[0072] In this embodiment, the circumferential positioning groove 25 is a spherical groove, so that the top nail 4 can enter and exit the circumferential positioning groove 25 relatively smoothly.

[0073] In this embodiment, the outer tube 3 includes a small hole section close to the reciprocating saw blade 1 and a large hole section away from the reciprocating saw blade 1 , and the aperture of the small hole section is smaller than the end size of the inner tube 2 close to the reciprocating saw blade 1 .

[0074] In this embodiment, the inner tube 2 is provided with an anti-rotation groove 27 for connecting to the reciprocating rod of the medical reciprocating saw, and the side wall of the anti-rotation groove 27 is also provided with a rivet hole 7, in which a rivet 7 is provided. The inner tube 2 is fixedly connected to the reciprocating rod through the rivet 7, and the outer tube 3 is provided with a hole for the rivet 7 to pass through.

[0075] In this embodiment, the anti-rotation groove 27 and the radial positioning groove 22 both axially penetrate the inner cylinder 2 , which facilitates processing and reduces the weight of the inner cylinder 2 .

[0076] In this embodiment, the saw blade quick-installation structure of the medical reciprocating saw further includes a jacket 6 disposed outside the outer tube 3 , and the outer end of the elastic member 5 abuts against the jacket 6 .

[0077] In this embodiment, a mounting groove 61 for positioning the elastic member 5 is provided on the inner side of the outer sleeve 6 , and a process hole 62 for machining the mounting groove 61 is provided on the outer side of the outer sleeve 6 ; the elastic member 5 is a compression spring.

[0078] In this embodiment, two operating planes are formed on the outer surface of the outer cylinder 3 to facilitate the rotation of the outer cylinder 3 .

[0079] In this embodiment, the inner cylinder 2 is fixedly connected to the reciprocating rod, so the inner cylinder 2 will not rotate when the outer cylinder 3 is rotated.

[0080] In this embodiment, a decorative cover is further provided outside the outer cover 6 , and the decorative cover covers the outer cover 6 .

[0081] The saw blade quick-installation structure of the medical reciprocating saw of the first embodiment of the present invention has the following beneficial effects: the reciprocating saw blade 1 can be disassembled and assembled by simply rotating the outer cylinder 3, which is easy to operate; the outer cylinder 3 can be effectively prevented from rotating when not subjected to external force by the top pin 4 and the elastic member 5, thereby ensuring that the reciprocating saw blade 1 will not fall out; the outer cylinder 3 can be switched between the disassembly position and the working position by rotating 90° back and forth; the axial force is transmitted between the inner cylinder 2 and the outer cylinder 3 by the axial force-bearing portion and the axial force-bearing groove 36, thereby preventing the top pin 4 and the arc groove 24 from being subjected to axial force, preventing the arc groove 24 from being deformed, and ensuring smooth rotation of the top pin 4.

[0082] The above is only a specific implementation of the invention, but the protection scope of the invention is not limited thereto. Those skilled in the art should understand that the invention includes but is not limited to the contents described in the above specific implementation. Any modification that does not deviate from the functional and structural principles of the invention will be included in the scope of the claims.

Claims

1. A saw blade quick-installation structure for a medical reciprocating saw, characterized in that: The saw blade quick-install structure of the medical reciprocating saw comprises: A reciprocating saw blade (1) comprises a cutting portion (11) and a radial positioning portion (12), wherein an axial anti-slip portion (13) is formed between the cutting portion (11) and the radial positioning portion (12); The inner cylinder (2) comprises a first cylinder body (21), the first cylinder body (21) being provided with a radial positioning groove (22) matched with the radial positioning portion (12) and an axial receiving groove (23) for receiving the axial anti-slip portion (13), an arc groove (24) being formed on the outer surface of the first cylinder body (21), and at least one end of the arc groove (24) being radially inwardly formed with a circumferential positioning groove (25); The outer cylinder (3) is rotatably sleeved outside the inner cylinder (2) and can be switched between a disassembly position and a working position by rotation, and comprises a second cylinder (31). The second cylinder (31) is provided with a center hole (32) for the radial positioning portion (12) of the reciprocating saw blade (1) to pass through and an edge groove (33) for the axial anti-slip portion (13) of the reciprocating saw blade (1) to pass through, the radial dimension of the center hole (32) is smaller than the axial anti-slip portion (13) of the reciprocating saw blade (1), and the second cylinder (31) is provided with a radial step hole (34); A top pin (4) is arranged in the radial step hole (34), comprising a small diameter portion at an inner end and a large diameter portion at an outer end, wherein the small diameter portion at the inner end of the top pin (4) passes through the radial step hole (34) and enters the arc-shaped groove (24) of the inner cylinder (2); An elastic member (5) generates a radially inward force on the top nail (4); When the outer cylinder (3) is in the disassembly position, the edge groove (33) of the second cylinder body (31) of the outer cylinder (3) and the axial projection of the axial receiving groove (23) of the first cylinder body (21) of the inner cylinder (2) at least partially overlap, so that the reciprocating saw blade (1) can move in and out; When the outer cylinder (3) is in the working position, the edge groove (33) of the second cylinder body (31) of the outer cylinder (3) is staggered with the axial receiving groove (23) of the first cylinder body (21) of the inner cylinder (2), and the outer cylinder (3) restricts the axial anti-slip portion (13) of the reciprocating saw blade (1) to prevent the reciprocating saw blade (1) from slipping out. At the same time, the top nail (4) is positioned in the circumferential positioning groove (25) under the action of the elastic member (5); The first cylinder body (21) of the inner cylinder (2) further extends radially outward to form an axial force-bearing ear (26), and the second cylinder body (31) of the outer cylinder (3) is provided with an axial force-bearing groove (36) that cooperates with the axial force-bearing ear (26); The inner tube (2) is provided with an anti-rotation groove (27) for connecting with the reciprocating rod of the medical reciprocating saw, and a rivet hole is also provided on the side wall of the anti-rotation groove (27), in which a rivet (7) is provided, and the inner tube (2) is fixedly connected with the reciprocating rod through the rivet (7), and the outer tube (3) is provided with a hole for the rivet (7) to pass through; The saw blade quick-installation structure of the medical reciprocating saw also includes an outer sleeve (6) arranged outside the outer cylinder (3), and the outer end of the elastic member (5) abuts against the outer sleeve (6).

2. The saw blade quick-installation structure of a medical reciprocating saw according to claim 1, characterized in that: The matching clearance between the axial force bearing groove (36) and the axial force bearing ear (26) is smaller than the matching clearance between the top pin (4) and the arc groove (24).

3. The saw blade quick-installation structure of a medical reciprocating saw according to claim 1, characterized in that: The axial force-bearing groove (36) is a 360° arc groove: the second cylinder body (31) of the outer cylinder (3) is provided with an ear groove (35) at one end away from the reciprocating saw blade (1) for the axial force-bearing ear (26) to pass through; the axial force-bearing ear (26) is provided in pair.

4. The saw blade quick-installation structure of a medical reciprocating saw according to claim 1, characterized in that: The axial dimension of the axial accommodating groove (23) of the first cylinder body (21) of the inner cylinder (2) is adapted to the axial dimension of the axial anti-slip portion (13) of the reciprocating saw blade (1).

5. The saw blade quick-installation structure of a medical reciprocating saw according to claim 1, characterized in that: The outer cylinder (3) rotates back and forth, and the rotation angle of the outer cylinder (3) is 90°; the axial anti-slip portion (13) and the axial accommodating groove (23) are in pairs; the top nail (4), the arc groove (24), and the elastic member (5) are each in pairs; both ends of the arc groove (24) are radially inwardly formed with circumferential positioning grooves (25); the circumferential positioning groove (25) is a spherical groove.

6. The saw blade quick-installation structure of a medical reciprocating saw according to claim 1, characterized in that: The outer cylinder (3) comprises a small hole section close to the reciprocating saw blade (1) and a large hole section away from the reciprocating saw blade (1); the hole diameter of the small hole section is smaller than the end size of the inner cylinder (2) close to one end of the reciprocating saw blade (1).

7. The saw blade quick-installation structure of a medical reciprocating saw according to claim 1, characterized in that: The inner side of the outer sleeve (6) is provided with a mounting groove (61) for positioning the elastic member (5), and the outer side of the outer sleeve (6) is provided with a process hole (62) for machining the mounting groove (61); the elastic member (5) is a compression spring.

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