Blade mounting structure and medical plastic reciprocating saw bender

Abstract

The present invention discloses a blade mounting structure and a medical plastic reciprocating saw bender, which relates to the technical field of medical plastic instruments; the blade mounting structure includes a mounting sleeve, a core sleeve and a core tube which are sleeved and connected in sequence from outside to inside; the mounting sleeve is fixedly connected with the handle body; the core sleeve is slidably connected with the mounting sleeve along the axis of the core tube; the core tube is fixedly connected with the core sleeve, an installation channel extending along its own axis is arranged inside the core tube, the handle part can be inserted into the core tube along the installation channel, and the inner side wall of the installation channel is mutually attached to the outer side surface of the handle part to limit the radial movement of the handle part. The technical solution provided by the present invention can improve the connection firmness between the blade body and the handle body to ensure that the blade body does not deviate or vibrate during the operation.

Description

Technical Field

[0001] The present invention relates to the technical field of medical plastic surgery instruments, and particularly relates to a blade mounting structure and a medical plastic reciprocating saw bender. Background Art

[0002] A medical plastic reciprocating saw bender generally refers to a medical plastic handpiece equipped with a reciprocating saw and having a certain bending arc on its handle body; in medical plastic surgery, the medical plastic reciprocating saw bender drives the blade body to perform a linear reciprocating motion along its own axis to perform sawing and shaping operations on the human bone tissue. In the prior art, the connection firmness between the blade body and the handle body is relatively low, so that the blade body deviates and vibrates during the operation, and in severe cases, medical accidents may occur.

[0003] It should be noted that the above content is only used to assist in understanding the technical solution of the present invention, and does not represent an admission that the above content is the prior art. Summary of the Invention

[0004] The main object of the present invention is to propose a blade mounting structure and a medical plastic reciprocating saw bender, aiming to improve the connection firmness between the blade body and the handle body to ensure that the blade body does not deviate and vibrate during the operation.

[0005] To achieve the above object, the present invention proposes a blade mounting structure applied to a medical plastic reciprocating saw bender; the medical plastic reciprocating saw bender includes a blade body and a handle body, wherein the blade body includes a blade portion and a cylindrical handle portion;

[0006] Specifically, the blade mounting structure includes a mounting sleeve, a core sleeve and a core tube which are sleeved and connected in sequence from outside to inside;

[0007] The mounting sleeve is fixedly connected to the handle body;

[0008] The core sleeve is slidably connected to the mounting sleeve along the axis of the core tube;

[0009] The core tube is fixedly connected to the core sleeve, and an installation channel extending along its own axis is provided inside the core tube. The handle portion can be inserted into the core tube along the installation channel, and the inner side wall of the installation channel is mutually attached to the outer side surface of the handle portion to limit the radial movement of the handle portion;

[0010] Wherein, a limiting member is provided at an end of the handle portion away from the blade portion, and a notch portion is provided at a connection portion between the limiting member and the handle portion; the blade mounting structure further includes a first positioning block and a second positioning block; the first positioning block is fixedly arranged in the mounting channel, and the first positioning block is used for being embedded into the notch portion to limit the axial movement of the handle portion; the second positioning block is slidably connected in the mounting channel, and the second positioning block is used for abutting against a side portion of the limiting member to limit the circumferential movement of the handle portion.

[0011] In an embodiment, an inner concave portion is provided on an inner side of the mounting sleeve, a guiding groove is provided on an outer side of the core sleeve, and a groove direction of the guiding groove is arranged along an axial direction of the core tube; the blade mounting structure includes a guiding member, at least a part of the guiding member is embedded and connected with the inner concave portion, and at least a part of the guiding member is slidably connected with the guiding groove.

[0012] In an embodiment, the guiding member has a spherical structure, and the guiding member is rotatably connected with the inner concave portion.

[0013] In an embodiment, an opening portion is provided at a connection portion between the mounting sleeve and the handle body, a driving groove is provided on a side portion of the core sleeve, and the driving groove is connected with a transmission structure located inside the handle body through the opening portion, so that the transmission structure can drive the core sleeve to perform a linear reciprocating sliding movement relative to the mounting sleeve through the driving groove.

[0014] In an embodiment, a connection channel is provided between the first positioning block and the mounting channel, a cross-sectional area of the connection channel is larger than a cross-sectional area of the limiting member, and the cross-sectional area of the connection channel is smaller than a cross-sectional area of the handle portion.

[0015] In an embodiment, a projection area of the second positioning block along an axial direction of the core tube is defined as a first projection area, a projection area of the connection channel along the axial direction of the core tube is defined as a second projection area, and at least a part of the first projection area overlaps with the second projection area.

[0016] In an embodiment, the blade mounting structure further includes a movable sleeve, and the movable sleeve is used for sliding the second positioning block to a first position or a second position; when the second positioning block slides to the first position, the second positioning block abuts against a side portion of the limiting member; when the second positioning block slides to the second position, the second positioning block releases the abutting against the side portion of the limiting member.

[0017] In one embodiment, the movable sleeve is slidably disposed between the core sleeve and the core tube; the movable sleeve includes a coaxial push sleeve ring and a connecting ring, a spring member is sleeved on the connecting ring, a convex portion is provided on the inner side of the core sleeve, and two ends of the spring member are respectively abutted against the convex portion and the push sleeve ring; a sliding channel is provided between the core sleeve and the core tube along the axial direction of the core tube, a connecting member is slidably disposed in the sliding channel, and the connecting ring is fixedly connected to the second positioning block through the connecting member.

[0018] In one embodiment, at least a part of the push sleeve ring is exposed outside the core sleeve; and, an anti-slip pattern is provided on the exposed area of the push sleeve ring.

[0019] To achieve the above object, the present invention provides a medical plastic reciprocating saw bender, including the blade mounting structure described in any one of the above.

[0020] The technical solution of the present invention sets the handle portion into a cylindrical structure. When the handle portion is inserted into the interior of the core tube through the installation channel, since the inner side wall of the installation channel is mutually attached to the outer side surface of the handle portion, the purpose of restricting the radial movement of the handle portion is achieved; at the same time, a first positioning block and a second positioning block are provided inside the installation channel. After the handle portion is inserted into the installation channel, on the one hand, the first positioning block is embedded into its notch portion. At this time, both sides of the first positioning block are respectively abutted against the handle portion and the end portion on the opposite side of the limiting member, so that the handle portion cannot perform axial movement under the restriction of the first positioning block; on the other hand, the second positioning block slides to abut against the side portion of the limiting member, so as to use the second positioning block to restrict the limiting member from rotating, so that the handle portion cannot perform circumferential movement under the restriction of the second positioning block. In summary, the radial movement, axial movement and circumferential movement of the handle portion are all restricted, so that the blade body cannot be displaced relative to the core tube, thereby improving the connection firmness between the blade body and the handle body to ensure that the blade body does not deviate or vibrate during the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the blade mounting structure provided by the present invention;

[0023] Figure 2Exploded structural schematic diagram of an embodiment of the blade mounting structure provided by the present invention;

[0024] Figure 3 Internal structural schematic diagram of an embodiment of the blade mounting structure provided by the present invention;

[0025] Figure 4 Schematic diagram of the first step of installing the blade body in an embodiment of the blade mounting structure provided by the present invention;

[0026] Figure 5 Schematic diagram of the second step of installing the blade body in an embodiment of the blade mounting structure provided by the present invention;

[0027] Figure 6 Schematic diagram of the third step of installing the blade body in an embodiment of the blade mounting structure provided by the present invention;

[0028] Figure 7 Schematic diagram of the fourth step of installing the blade body in an embodiment of the blade mounting structure provided by the present invention.

[0029] Explanation of reference numerals:

[0030] 100, blade body; 110, blade part; 120, handle part; 130, limiting part; 140, notch part; 200, handle body; 210, transmission structure; 300, mounting sleeve; 310, opening part; 320, concave part; 400, shaft core sleeve; 410, driving groove; 420, guiding groove; 430, protruding part; 440, sliding channel; 500, shaft core pipe; 510, mounting channel; 520, connecting channel; 600, first positioning block; 700, second positioning block; 800, guiding part; 900, movable sleeve; 910, pushing sleeve ring; 920, connecting ring; 930, spring part; 940, connecting part;

[0031] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0032] Next, the technical solutions in the present invention will be clearly and completely described in conjunction with the accompanying drawings in the present invention. Obviously, the described ones are only some embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts shall fall within the protection scope of the present invention.

[0033] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, then such directional indications are only used to explain the relative positional relationship, movement conditions, etc. between components in a certain specific posture (as shown in the attached drawings). If this specific posture changes, then the directional indications will also change accordingly.

[0034] In addition, it should be noted that the descriptions involving "first", "second", etc. in the present invention are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. Additionally, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0035] The medical plastic reciprocating saw bender refers to a general term for a medical plastic handpiece equipped with a reciprocating saw and having a certain bending arc on its handle body; in medical plastic surgery, the medical plastic reciprocating saw bender drives the blade body to perform a linear reciprocating motion along its own axis to perform sawing and shaping operations on human bone tissue. In the prior art, the connection firmness between the blade body and the handle body is relatively low, resulting in the situation that the blade body deviates from vibration during the operation, and in severe cases, it may lead to medical accidents.

[0036] To solve the above technical problems, the present invention proposes a blade mounting structure.

[0037] Please refer to Figures 1 - 3 , in an embodiment of the present invention, the blade mounting structure is applied to a medical plastic reciprocating saw bender; the medical plastic reciprocating saw bender includes a blade body 100 and a handle body 200, wherein the blade body 100 includes a blade portion 110 and a cylindrical handle portion 120;

[0038] Specifically, the blade mounting structure includes a mounting sleeve 300, a core sleeve 400, and a core tube 500 that are sleeved and connected in sequence from outside to inside;

[0039] The mounting sleeve 300 is fixedly connected to the handle body 200;

[0040] The core sleeve 400 is slidably connected to the mounting sleeve 300 along the axis of the core tube 500;

[0041] The core tube 500 is fixedly connected to the core sleeve 400. An installation channel 510 extending along its own axis is provided inside the core tube 500. The tool holder part 120 can be inserted into the core tube 500 along the installation channel 510, and the inner side wall of the installation channel 510 is in mutual fit with the outer side surface of the tool holder part 120 to limit the radial movement of the tool holder part 120;

[0042] Wherein, a limiting member 130 is provided at the end of the tool holder part 120 far from the blade part 110, and a notch part 140 is provided at the connection between the limiting member 130 and the tool holder part 120; The blade mounting structure further includes a first positioning block 600 and a second positioning block 700; The first positioning block 600 is fixedly arranged in the installation channel 510, and the first positioning block 600 is used for being embedded into the notch part 140 to limit the axial movement of the tool holder part 120; The second positioning block 700 is slidably connected in the installation channel 510, and the second positioning block 700 is used for abutting against the side part of the limiting member 130 to limit the circumferential movement of the tool holder part 120.

[0043] The technical solution of the present invention sets the tool holder part 120 into a cylindrical structure. When the tool holder part 120 is inserted into the inside of the core tube 500 through the installation channel 510, since the inner side wall of the installation channel 510 is in mutual fit with the outer side surface of the tool holder part 120, the purpose of limiting the radial movement of the tool holder part 120 is achieved; At the same time, a first positioning block 600 and a second positioning block 700 are arranged inside the installation channel 510. After the tool holder part 120 is inserted into the installation channel 510, on the one hand, the first positioning block 600 is embedded into the notch part 140 thereof. At this time, both sides of the first positioning block 600 are respectively abutted against the tool holder part 120 and the end parts on the opposite side of the limiting member 130, so that the tool holder part 120 cannot perform axial movement under the limitation of the first positioning block 600; On the other hand, the second positioning block 700 slides to abut against the side part of the limiting member 130 to use the second positioning block 700 to limit the limiting member 130 from rotating, so that the tool holder part 120 cannot perform circumferential movement under the limitation of the second positioning block 700. To sum up, the radial movement, axial movement and circumferential movement of the tool holder part 120 are all limited, so that the blade body 100 cannot be displaced relative to the core tube 500, thereby improving the connection firmness between the blade body 100 and the handle body 200 to ensure that the blade body 100 does not deviate and vibrate during the operation.

[0044] Specifically, an opening 310 is provided at the connection between the installation sleeve 300 and the handle body 200. A driving groove 410 is provided on the side of the core sleeve 400. The driving groove 410 is connected to the transmission structure 210 located inside the handle body 200 through the opening 310, so that the transmission structure 210 can drive the core sleeve 400 to make a linear reciprocating sliding movement relative to the installation sleeve 300 through the driving groove 410. With such a setting, the transmission structure 210 located inside the handle body 200 is combined with the driving groove 410 to drive the core sleeve 400 to make a linear reciprocating sliding movement relative to the installation sleeve 300. Since the core tube 500 is fixedly connected to the core sleeve 400 and the core tube 500 is fixedly connected to the handle part 120 of the blade body 100, the blade body 100 can be driven to make a linear reciprocating movement along its own axis, so that the blade body 100 can smoothly perform sawing and shaping operations on human bone tissue.

[0045] As a preferred solution of the above embodiment, an inner concave part 320 is provided on the inner side of the installation sleeve 300, and a guiding groove 420 is provided on the outer side of the core sleeve 400. The groove direction of the guiding groove 420 is arranged along the axial direction of the core tube 500; the blade installation structure includes a guiding member 800. At least part of the guiding member 800 is embedded and connected to the inner concave part 320, and at least part of the guiding member 800 is slidably connected to the guiding groove 420. With such a setting, at least part of the guiding member 800 is embedded into the inner concave part 320 to fix the guiding member 800 to the installation sleeve 300; at the same time, at least part of the guiding member 800 is slidably connected in the guiding groove 420, and the groove direction of the guiding groove 420 is arranged along the axial direction of the core tube 500. Through the combined action of the guiding groove 420 and the guiding member 800, it is ensured that when the core sleeve 400 slides relative to the installation sleeve 300, the sliding track of the core sleeve 400 is arranged along the axial direction of the core tube 500, thereby improving the smoothness of the core sleeve 400 when sliding relative to the installation sleeve 300.

[0046] Furthermore, the guiding member 800 has a spherical structure, and the guiding member 800 is rotatably connected to the inner concave part 320. With such a setting, the guiding member 800 is set to have a spherical structure, so that the connection mode between the guiding member 800 and the guiding groove 420 forms a rolling connection, thereby reducing the friction force between the guiding member 800 and the guiding groove 420, and thus reducing the wear of the guiding member 800 and / or the guiding groove 420 caused by the long-term reciprocating movement of the core sleeve 400 relative to the installation sleeve 300, which is beneficial to extending the service life of the present application.

[0047] As a preferred solution of the above embodiment, a connection channel 520 is provided between the first positioning block 600 and the installation channel 510. The cross-sectional area of the connection channel 520 is larger than the cross-sectional area of the limiting member 130, and the cross-sectional area of the connection channel 520 is smaller than the cross-sectional area of the tool shank portion 120. With such a setting, the connection channel 520 can allow the limiting member 130 to pass through, and the tool shank portion 120 cannot pass through the connection channel 520, thereby ensuring that the subsequent first positioning block 600 can be embedded into the notch portion 140 located between the limiting member 130 and the tool shank portion 120.

[0048] Further, the projection area of the second positioning block 700 along the axis of the core tube 500 is defined as the first projection area, and the projection area of the connection channel 520 along the axis of the core tube 500 is defined as the second projection area. At least part of the first projection area overlaps with the second projection area. With such a setting, when the limiting member 130 passes through the connection channel 520, its free end will surely abut against the end of the second positioning block 700, and as the tool shank portion 120 continues to be inserted, the limiting member 130 will drive the second positioning block 700 to move in the insertion direction of the tool shank portion 120; when the tool shank portion 120 moves to abut against the first positioning block 600, the blade body 100 is rotated by a certain angle. On the one hand, the notch portion 140 thereof is fitted with the first positioning block 600, and on the other hand, the abutment of the limiting member 130 against the second positioning block 700 is released, so that the second positioning block 700 can move in the pulling-out direction of the tool shank portion 120 and the second positioning block 700 abuts against the side of the limiting member 130.

[0049] As a preferred solution of the above embodiment, the blade mounting structure further includes a movable sleeve 900 for sliding the second positioning block 700 to a first position or a second position; when the second positioning block 700 slides to the first position, the second positioning block 700 abuts against the side of the limiting member 130; when the second positioning block 700 slides to the second position, the second positioning block 700 releases the abutment with the side of the limiting member 130. With such a setting, considering that when replacing the blade body 100, it is necessary to first release the restriction of the second positioning block 700 on the limiting member 130 so that the tool shank portion 120 can rotate circumferentially until the limiting member 130 is aligned with the connection channel 520, so that the limiting member 130 can pass through the connection channel 520 to pull out the tool shank portion 120 from the installation channel 510. Therefore, by providing the movable sleeve 900, the operator can slide the second positioning block 700 to the second position through the movable sleeve 900, so that the second positioning block 700 releases the abutment with the side of the limiting member 130, and then the blade body 100 and the handle body 200 are separated from each other.

[0050] Furthermore, the movable sleeve 900 is slidably arranged between the shaft core sleeve 400 and the shaft core tube 500; the movable sleeve 900 includes a coaxially arranged push sleeve ring 910 and a connecting ring 920, a spring member 930 is sleeved on the connecting ring 920, a protrusion 430 is provided on the inner side of the shaft core sleeve 400, and the two ends of the spring member 930 are respectively abutted against the protrusion 430 and the push sleeve ring 910; a sliding channel 440 is provided between the shaft core sleeve 400 and the shaft core tube 500 and is arranged along the axial direction of the shaft core tube 500, a connecting member 940 is slidably arranged in the sliding channel 440, and the connecting ring 920 is fixedly connected to the second positioning block 700 through the connecting member 940. In this way, the movable sleeve 900 is slidably arranged between the shaft core sleeve 400 and the shaft core tube 500, so that the movable sleeve 900 can only slide along the axial direction of the shaft core tube 500 under the outer and inner limiting effects of the shaft core sleeve 400 and the shaft core tube 500. At the same time, the spring member 930 is used as one of the power sources for the movement of the push sleeve ring 910. When the operator slides the push sleeve ring 910 in the insertion direction of the handle 120 to compress the spring member 930, and then the operator releases the force on the push sleeve ring 910, the push sleeve ring 910 can slide in the direction of the handle 120 under the elastic force of the spring member 930. Since the second positioning block 700 is fixedly connected to the connecting ring 920 through the connecting member 940, the second positioning block 700 slides in the direction of the handle 120, that is, the second positioning block 700 moves from the second position to the first position, so as to ensure the smooth implementation of the technical solution of the present application.

[0051] Furthermore, at least a portion of the push collar 910 is exposed outside the shaft core sleeve 400 ; this arrangement facilitates the operator to push the push collar 910 through the exposed area, which is beneficial to speeding up the disassembly and assembly efficiency of the blade body 100 .

[0052] Furthermore, the exposed area of the push collar 910 is provided with anti-skid patterns (not shown in the drawings). In this way, the anti-skid patterns can increase the friction between the operator and the push collar 910, so that the operator can push the push collar 910 easily, thereby sliding the second positioning block 700 to the second position, so as to release the mutual contact between the second positioning block 700 and the stopper 130.

[0053] The following is a detailed description of the disassembly and assembly process of the blade body 100 and the handle body 200 in combination with the above embodiments:

[0054] When installing the blade body 100:

[0055] Step 1: Refer to the attached Figure 4, insert the handle part 120 of the blade body 100 into the installation channel 510 of the core tube 500. Since the inner side wall of the installation channel 510 fits with the outer side surface of the handle part 120, the radial movement of the handle part 120 is restricted;

[0056] Step ②: Refer to the appendix Figure 5 , as the handle part 120 continues to be inserted, its limiting member 130 passes through the connection channel 520 until the first positioning block 600 abuts against the end of the handle part 120; during this period, after its limiting member 130 passes through the connection channel 520, it abuts against the end of the second positioning block 700, and as the handle part 120 continues to be inserted, the limiting member 130 drives the second positioning block 700 to move in the insertion direction of the handle part 120. During this period, the second positioning block 700 will drive the push sleeve ring 910 to move in the insertion direction of the handle part 120 synchronously through the connecting member 940, thereby compressing the spring member 930 sleeved on the connecting ring 920;

[0057] Step ③: Refer to the appendix Figures 6 - 7 , rotate the blade body 100 by a certain angle. On the one hand, make its notch part 140 fit with the first positioning block 600 to restrict the axial movement of the handle part 120; on the other hand, release the abutment of the limiting member 130 on the second positioning block 700, so that the second positioning block 700 and the push sleeve ring 910 move together in the pulling-out direction of the handle part 120 under the elastic force of the spring member 930, so that the second positioning block 700 abuts against the side part of the limiting member 130; since the second positioning block 340 is connected to the connecting member 364, and the connecting member 364 is restricted by the sliding channel 365 and can only slide along the axial direction of the core tube 320, the second positioning block 700 cannot perform circumferential movement, thereby restricting the circumferential movement of the handle part 120; thus completing the installation operation of the blade body 100.

[0058] When disassembling the blade body 100:

[0059] Step ④: Push the push sleeve ring 910 in the insertion direction of the handle part 120, and use the push sleeve ring 910 to push the sliding connecting member 940. Since the connecting member 940 is fixedly connected to the second positioning block 700, the second positioning block 700 also moves in the insertion direction of the handle part 120 synchronously, so that the second positioning block 700 releases the restriction on the limiting member 130, that is, the second positioning block 700 releases the restriction on the circumferential movement of the handle part 120;

[0060] Step ⑤: Perform circumferential movement on the blade body 100 to rotate it until the limiting member 130 is aligned with the connection channel 520. At this time, the notch part 140 releases the mutual engagement with the first positioning block 600, that is, the first positioning block 600 releases the restriction on the axial movement of the handle part 120;

[0061] Step ⑥: Move the handle portion 120 in the pulling-out direction. At this time, the limiting member 130 can pass through the connecting channel 520 until the handle portion 120 is separated from the shaft core tube 500, thereby completing the disassembly operation of the blade body 100. Subsequently, the push collar 910 moves in the pulling-out direction of the handle portion 120 under the elastic force of the spring for resetting. During the resetting process of the push collar 910, the second positioning block 700 is also driven by the connecting member 940 to move in the pulling-out direction of the handle portion 120 for resetting.

[0062] This embodiment also discloses a medical plastic reciprocating saw bender, including the blade mounting structure of any of the above embodiments. For the specific structure of the blade mounting structure, reference may be made to the above embodiments. Since this medical plastic reciprocating saw bender adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated one by one here.

[0063] It should be noted that the other contents of the blade mounting structure and the medical plastic reciprocating saw bender disclosed in the present invention are prior art and will not be elaborated here.

[0064] The above are only optional embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. All those directly or indirectly applied in other related technical fields of the present invention are included in the patent protection scope of the present invention.

Claims

1. A medical plastic reciprocating saw bender; the medical plastic reciprocating saw bender includes a blade body and a handle body, wherein the blade body includes a blade portion and a cylindrical handle portion; characterized in that, The medical plastic reciprocating saw bender includes a blade mounting structure, and the blade mounting structure includes a mounting sleeve, a core sleeve and a core tube which are sleeved and connected in sequence from outside to inside; The mounting sleeve is fixedly connected to the handle body; The core sleeve is slidably connected to the mounting sleeve along the axis of the core tube; The core tube is fixedly connected to the core sleeve. An installation channel extending along its own axis is provided inside the core tube. The handle portion can be inserted into the core tube along the installation channel, and the inner side wall of the installation channel is mutually attached to the outer side surface of the handle portion to limit the radial movement of the handle portion; Wherein, a limiting member is provided at the end of the handle portion far from the blade portion, and a notch portion is provided at the connection portion between the limiting member and the handle portion; the blade mounting structure further includes a first positioning block and a second positioning block; the first positioning block is fixedly arranged in the installation channel, and the first positioning block is used for being embedded into the notch portion to limit the axial movement of the handle portion; the second positioning block is slidably connected in the installation channel, and the second positioning block is used for abutting against the side portion of the limiting member to limit the circumferential movement of the handle portion; An opening portion is provided at the connection portion between the mounting sleeve and the handle body, and a driving groove is provided on the side portion of the core sleeve. The driving groove is connected to a transmission structure located inside the handle body through the opening portion, so that the transmission structure can drive the core sleeve to make a linear reciprocating sliding movement relative to the mounting sleeve through the driving groove; A connection channel is provided between the first positioning block and the installation channel. The cross-sectional area of the connection channel is larger than the cross-sectional area of the limiting member, and the cross-sectional area of the connection channel is smaller than the cross-sectional area of the handle portion; Define the projection area of the second positioning block along the axial direction of the core tube as the first projection area, and define the projection area of the connection channel along the axial direction of the core tube as the second projection area. At least part of the first projection area overlaps with the second projection area; so that after the limiting member passes through the connection channel, its free end abuts against the end of the second positioning block, and as the handle portion continues to be inserted, the limiting member will drive the second positioning block to move in the insertion direction of the handle portion; after the handle portion moves to abut against the first positioning block, rotate the blade body by a certain angle. On the one hand, make the notch portion thereof fit with the first positioning block, and on the other hand, release the abutment of the limiting member against the second positioning block, so that the second positioning block can move in the pulling-out direction of the handle portion and make the second positioning block abut against the side portion of the limiting member.

2. The medical plastic reciprocating saw bender according to claim 1, characterized in that: An inner concave portion is provided on the inner side of the mounting sleeve, and a guiding groove is provided on the outer side of the core sleeve. The groove direction of the guiding groove is arranged along the axial direction of the core tube; the blade mounting structure includes a guiding member, at least part of the guiding member is embedded and connected with the inner concave portion, and at least part of the guiding member is slidably connected with the guiding groove.

3. The medical plastic reciprocating saw bender according to claim 2, characterized in that: The guiding member has a spherical structure, and the guiding member is rotatably connected to the concave portion.

4. The medical plastic reciprocating saw bender according to claim 1, wherein: The blade mounting structure further includes a movable sleeve for sliding the second positioning block to a first position or a second position; when the second positioning block slides to the first position, the second positioning block abuts against the side portion of the limiting member; when the second positioning block slides to the second position, the second positioning block is disengaged from abutting against the side portion of the limiting member.

5. The medical plastic reciprocating saw bender according to claim 4, characterized in that: The movable sleeve is slidably disposed between the shaft core sleeve and the shaft core tube; the movable sleeve includes a coaxial push sleeve ring and a connecting ring, a spring member is sleeved on the connecting ring, a convex portion is provided on the inner side of the shaft core sleeve, and two ends of the spring member respectively abut against the convex portion and the push sleeve ring; a sliding channel is provided between the shaft core sleeve and the shaft core tube along the axial direction of the shaft core tube, a connecting member is slidably disposed in the sliding channel, and the connecting ring is fixedly connected to the second positioning block through the connecting member.

6. The medical plastic reciprocating saw bender according to claim 5, characterized in that: At least a part of the push sleeve ring is exposed outside the shaft core sleeve; and, an anti-slip pattern is provided on the exposed area of the push sleeve ring.

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