Medical plastic sagittal saw handpiece

Abstract

The utility model discloses a medical plastic sagittal saw handpiece, and relates to the technical field of medical plastic instruments. The medical plastic sagittal saw comprises a cutter body, a handle body and a transmission structure, wherein the cutter body comprises a blade part and a cutter handle part which are connected with each other; the front end of the handle body is used for being connected with the knife handle part, and the rear end of the handle body is used for being connected with an external rotation driving device. The transmission structure is mounted in the handle body, so that the rotary driving device can drive the cutter body to do reciprocating arc-shaped swinging motion through the transmission structure; the transmission structure comprises an eccentric assembly and a transmission shaft tube; the eccentric assembly comprises a swing part and an eccentric wheel part. According to the technical scheme provided by the utility model, the situation that the sagittal saw is stuck during operation can be reduced, so that the stability of an operation process is improved, and medical negligence is avoided.

Description

Technical Field

[0001] This utility model relates to the field of medical orthopedic instruments, and in particular to a medical orthopedic sagittal saw handpiece. Background Technology

[0002] In cosmetic surgery, a surgical handpiece equipped with a sagittal saw is typically used. The handpiece drives the sagittal saw in a reciprocating arc-shaped oscillating motion to cut and reshape human bone tissue. However, in current technology, the internal transmission structure of these sagittal saw handpieces is complex, making it prone to jamming during operation. This can affect the smoothness of the surgical procedure and, in severe cases, lead to medical accidents.

[0003] It should be noted that the above content is only used to help understand the technical solution of this utility model, and does not represent an admission that the above content is prior art. Utility Model Content

[0004] The main purpose of this invention is to propose a medical orthopedic sagittal saw handpiece, which aims to reduce the occurrence of jamming during operation of the sagittal saw, thereby improving the stability of the surgical process and avoiding medical accidents.

[0005] To achieve the above objectives, this utility model proposes a medical orthopedic sagittal saw handpiece;

[0006] Specifically, the medical orthopedic sagittal saw handpiece includes:

[0007] The tool body includes a blade portion and a shank portion connected together;

[0008] The handle body has a front end for connecting to the knife handle portion and a rear end for connecting to an external rotary drive device.

[0009] A transmission structure is installed inside the handle body so that the rotary drive device can drive the tool body to perform a reciprocating arc-shaped oscillating motion through the transmission structure.

[0010] Specifically, the transmission structure includes an eccentric assembly and a transmission shaft tube; the eccentric assembly includes a swing member and an eccentric wheel member, the central axis and rotation axis of the eccentric wheel member being located on different straight lines; the swing member has a recessed swing groove, the groove direction of which is arranged radially along the transmission shaft tube; the eccentric wheel member is disposed in the swing groove, wherein the swing groove has an active space for the eccentric wheel member to perform reciprocating eccentric rotation, at least a portion of the outer side surface of the eccentric wheel member is in contact with the inner sidewall of the swing groove; the eccentric wheel member can perform reciprocating eccentric rotation under the drive of the rotary drive device; the transmission shaft tube has rotating shaft pins on opposite sides of its middle section, and the transmission shaft tube is rotatably connected to the handle body through the rotating shaft pins; the front end of the transmission shaft tube is connected to the tool holder, and the rear end of the transmission shaft tube is fixedly connected to the swing member.

[0011] In one embodiment, the eccentric assembly further includes an eccentric wheel shaft and a first bearing housing. The front end of the eccentric wheel shaft is connected to the eccentric wheel component, and the eccentric wheel shaft is fitted into the first bearing housing. The eccentric wheel shaft is rotatably connected to the handle body through the first bearing housing.

[0012] In one embodiment, the transmission structure includes a gear assembly, and the rotary drive device drives the eccentric wheel to perform eccentric reciprocating motion through the gear assembly;

[0013] Specifically, the gear assembly includes an external gear and an internal gear ring. The external gear is located on the inner side of the internal gear ring and meshes with the internal gear ring for transmission. The external gear is connected to the drive end of the rotary drive device, and the internal gear ring is fixedly connected to the rear end of the eccentric wheel shaft through a connecting disc.

[0014] In one embodiment, a connecting structure is installed inside the handle body, the connecting structure being used to connect the transmission structure to the drive end of the rotary drive device;

[0015] Specifically, the connection structure includes a connecting sleeve and a connecting shaft tube arranged coaxially. The rear end of the connecting sleeve is used to connect to the driving end of the rotary drive device. The front end of the connecting sleeve is slidably sleeved on the rear end of the connecting shaft tube, and the connecting sleeve can slide relative to the connecting shaft tube. The front end of the connecting shaft tube is fixedly connected to the external gear. A fixing ring is fixedly sleeved on the connecting shaft tube, and a first spring is sleeved on the connecting shaft tube. The first spring is disposed between the fixing ring and the rear end of the connecting sleeve.

[0016] In one embodiment, the connecting structure further includes a second bearing housing, which is fitted onto the connecting shaft tube; the connecting shaft tube is rotatably connected to the handle body via the second bearing housing.

[0017] In one embodiment, a limiting groove is formed at the front end of the connecting sleeve, and the groove is oriented along the axial direction of the connecting sleeve; a limiting pin is fixedly provided at the rear end of the connecting shaft tube, and the limiting pin is slidably connected in the limiting groove.

[0018] In one embodiment, the medical orthopedic sagittal saw includes a mounting structure for fixing the handle portion to the drive shaft tube.

[0019] Specifically, the mounting structure includes a mounting cavity disposed at the front end of the drive shaft tube, the mounting cavity being used to sleeve the tool holder portion, and the inner side of the mounting cavity and the outer side of the tool holder portion fitting together to restrict the radial movement of the tool holder portion; wherein, the end of the tool holder portion away from the blade portion is provided with a limiting member, and the connection between the limiting member and the tool holder portion is provided with a notch portion; the mounting structure further includes a first positioning block and a second positioning block; the first positioning block is fixedly disposed in the mounting cavity, and the first positioning block is used to be embedded in the notch portion to restrict the axial movement of the tool holder portion; the second positioning block is slidably connected to the mounting cavity, and the second positioning block is used to abut against the side of the limiting member to restrict the circumferential movement of the tool holder portion.

[0020] In one embodiment, there is a preset gap between the first positioning block and the mounting cavity, the cross-sectional area of ​​the preset gap is larger than the cross-sectional area of ​​the limiting member, and the cross-sectional area of ​​the preset gap is smaller than the cross-sectional area of ​​the handle portion.

[0021] In one embodiment, the mounting structure further includes a sliding ring slidably sleeved on the drive shaft tube, the drive shaft tube having a sliding groove, the groove being oriented along the axial direction of the drive shaft tube; a connecting pin is slidably connected in the sliding groove, and the sliding ring is fixedly connected to the second positioning block via the connecting pin; a second spring is provided in the mounting cavity, the second spring being disposed between the second positioning block and the rear end of the drive shaft tube.

[0022] In one embodiment, the mounting structure further includes a push sleeve assembly for the operator to slide the sliding ring. Specifically, the push sleeve assembly includes a guide sleeve slidably fitted onto the drive shaft tube, and a push sleeve slidably fitted onto the front end of the guide sleeve. At least a portion of the push sleeve is exposed outside the handle body. The guide sleeve is fixedly connected to the handle body, and the rotating shaft pin is rotatably connected to the guide sleeve. The guide sleeve has a guide groove, the groove being axially aligned with the drive shaft tube. A push pin is slidably connected in the guide groove, one end of which is fixedly connected to the push sleeve, and the other end of which abuts against the end of the sliding ring away from the second spring.

[0023] In one embodiment, a limiting ring is provided at the rear end of the guide sleeve, and a third spring is sleeved on the guide sleeve, the third spring being disposed between the pusher assembly and the limiting ring;

[0024] In one embodiment, the exposed area of ​​the push kit is provided with anti-slip texture.

[0025] The technical solution of this utility model is to set up a transmission structure so that the rotary drive device can drive the tool body to perform a reciprocating arc-shaped swing motion, so that the blade part can cut and shape human bone tissue. The transmission structure includes an eccentric component and a transmission shaft tube. The eccentric component includes a swinging component and an eccentric wheel component. The central axis and the rotation axis of the eccentric wheel component are not on the same straight line. When the rotary drive device drives the eccentric wheel component to perform a reciprocating eccentric rotational motion, since at least part of the outer surface of the eccentric wheel component is in contact with the inner side wall of the swing groove, and the transmission shaft tube is rotatably connected to the handle body through a rotating shaft pin, the swinging component can drive the transmission shaft tube to perform an arc-shaped swing motion around the rotating shaft pin under the multiple constraints of the eccentric wheel component and the transmission shaft tube. Since the transmission shaft tube is connected to the tool holder, the purpose of driving the tool body to perform a reciprocating arc-shaped swing motion is achieved. Furthermore, the swing groove in the aforementioned transmission structure is provided with an active space for the eccentric wheel to reciprocate eccentrically rotate. This active space can also serve as an adjustment space for adjusting the relative position of the eccentric wheel and the swing component, thereby enabling small-amplitude position adjustments within the transmission structure to reduce the occurrence of jamming during operation of the sagittal saw; thus improving the stability of the surgical procedure and preventing medical accidents. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 A schematic diagram of one embodiment of the medical orthopedic sagittal saw handpiece provided by this utility model;

[0028] Figure 2 A second structural schematic diagram of an embodiment of the medical orthopedic sagittal saw handpiece provided by this utility model;

[0029] Figure 3 A schematic diagram of the transmission and connection structures in one embodiment of the medical orthopedic sagittal saw handpiece provided by this utility model;

[0030] Figure 4 For the appendix Figure 3 Enlarged view of a portion at point A;

[0031] Figure 5 A schematic diagram of the connection structure in one embodiment of the medical orthopedic sagittal saw handpiece provided by this utility model;

[0032] Figure 6 An exploded structural diagram of the connection structure in one embodiment of the medical orthopedic sagittal saw handpiece provided by this utility model;

[0033] Figure 7 A schematic diagram of the mounting structure in one embodiment of the medical orthopedic sagittal saw handpiece provided by this utility model;

[0034] Figure 8 An exploded view of the mounting structure in one embodiment of the medical orthopedic sagittal saw handpiece provided by this utility model;

[0035] Figure 9 One of the internal structural diagrams of the mounting structure in an embodiment of the medical orthopedic sagittal saw handpiece provided by this utility model;

[0036] Figure 10 A second internal structural diagram of the mounting structure in one embodiment of the medical orthopedic sagittal saw handpiece provided by this utility model;

[0037] Figure 11 An exploded view of the transmission shaft tube in one embodiment of the medical orthopedic sagittal saw handpiece provided by this utility model;

[0038] Figure 12One of the installation steps of the blade body in an embodiment of the medical orthopedic sagittal saw handpiece provided by this utility model;

[0039] Figure 13 The second embodiment of the medical orthopedic sagittal saw provided by this utility model shows the installation steps of the blade body.

[0040] Figure 14 The third step of the installation process of the blade body in one embodiment of the medical orthopedic sagittal saw provided by this utility model;

[0041] Figure 15 The fourth figure shows the installation steps of the blade body in one embodiment of the medical orthopedic sagittal saw provided by this utility model.

[0042] Explanation of reference numerals in the attached figures:

[0043] 100. Tool body; 110. Cutting blade section; 120. Tool holder section; 130. Limiting component; 131. Notch section; 200. Handle body; 300. Transmission structure; 400. Gear assembly; 410. External gear; 420. Internal gear ring; 430. Connecting disc; 500. Eccentric assembly; 510. Swinging component; 511. Swinging groove; 512. Movement space; 520. Eccentric wheel component; 530. Eccentric wheel shaft; 600. Transmission shaft tube; 610. Mounting cavity; 620. Sliding groove; 630. Rotating shaft pin; 700. Connecting structure; 710. Connecting sleeve 711. Limiting groove; 720. Connecting shaft tube; 721. Limiting pin; 730. Fixing ring; 740. First spring; 750. Second bearing seat; 800. Mounting structure; 810. First positioning block; 820. Second positioning block; 830. Preset gap; 840. Sliding ring; 850. Connecting pin; 860. Second spring; 900. Push sleeve assembly; 910. Guide sleeve; 911. Guide groove; 912. Swing clearance; 920. Push assembly; 921. Anti-slip texture; 930. Push pin; 940. Limiting ring; 950. Third spring;

[0044] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0045] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, what is described is only a part of the embodiments of this utility model, and not all of the embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0046] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0047] Furthermore, it should be noted that the descriptions involving "first," "second," etc., in this utility model are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0048] In cosmetic surgery, a surgical handpiece equipped with a sagittal saw is typically used. The handpiece drives the sagittal saw in a reciprocating arc-shaped oscillating motion to cut and reshape human bone tissue. However, in current technology, the internal transmission structure of these sagittal saw handpieces is complex, making it prone to jamming during operation. This can affect the smoothness of the surgical procedure and, in severe cases, lead to medical accidents.

[0049] To solve the above-mentioned technical problems, this utility model proposes a medical orthopedic sagittal saw handpiece.

[0050] Please see Figure 1-3 In one embodiment of this utility model, the medical orthopedic sagittal saw handpiece includes:

[0051] The tool body 100 includes a blade portion 110 and a shank portion 120 connected to each other.

[0052] The handle body 200 has a front end for connecting to the handle portion 120 and a rear end for connecting to an external rotary drive device (not shown in the attached figure). For ease of understanding, this application defines the direction in which the handle body 200 is used to connect to the handle portion 120 as the front end direction and the direction in which the handle body 200 is used to connect to the rotary drive device as the rear end direction.

[0053] The transmission structure 300 is installed inside the handle body 200 so that the rotary drive device can drive the tool body 100 to perform a reciprocating arc-shaped oscillating motion through the transmission structure 300. It can be understood that the rotary drive device is driven by alternating clockwise and counterclockwise rotation to achieve the purpose of driving the tool body 100 to perform a reciprocating arc-shaped oscillating motion.

[0054] Specifically, see the attached document. Figure 3-4 The transmission structure 300 includes an eccentric assembly 500 and a transmission shaft tube 600; the eccentric assembly 500 includes a swing member 510 and an eccentric wheel member 520, the central axis and the rotation axis of the eccentric wheel member 520 are not on the same straight line; the swing member 510 is provided with a recessed swing groove 511, the groove direction of the swing groove 511 is arranged radially along the transmission shaft tube 600; the eccentric wheel member 520 is disposed in the swing groove 511, wherein the swing groove 511 is provided for the eccentric wheel member 520 to perform reciprocating eccentric rotation. In the active space 512, at least a portion of the outer side of the eccentric wheel 520 is in contact with the inner sidewall of the swing groove 511; the eccentric wheel 520 can perform reciprocating eccentric rotation under the drive of the rotary drive device; the transmission shaft tube 600 is provided with rotating shaft pins 630 on opposite sides of the middle part, and the transmission shaft tube 600 is rotatably connected to the handle body 200 through the rotating shaft pins 630; the front end of the transmission shaft tube 600 is connected to the tool holder part 120, and the rear end of the transmission shaft tube 600 is fixedly connected to the swing member 510.

[0055] The technical solution of this utility model is to set up a transmission structure 300 so that the rotary drive device can drive the cutter body 100 to perform a reciprocating arc-shaped oscillating motion, so that the blade part 110 can cut and shape human bone tissue. The transmission structure 300 includes an eccentric component 500 and a transmission shaft tube 600. The eccentric component 500 includes an oscillating member 510 and an eccentric wheel 520. The central axis and the rotation axis of the eccentric wheel 520 are not on the same straight line. When the rotary drive device drives the eccentric wheel 520 to perform reciprocating eccentric motion... During rotation, since at least part of the outer side of the eccentric wheel 520 is in contact with the inner sidewall of the swing groove 511, and the drive shaft tube 600 is rotatably connected to the handle body 200 through the rotating shaft pin 630, the swing member 510 can drive the drive shaft tube 600 to swing around the rotating shaft pin 630 in an arc-shaped motion under the multiple constraints of the eccentric wheel 520 and the drive shaft tube 600; and since the drive shaft tube 600 is connected to the tool holder 120, the purpose of driving the tool body 100 to perform a reciprocating arc-shaped swing motion is achieved. Furthermore, the swing groove 511 in the aforementioned transmission structure 300 is provided with an active space 512 for the eccentric wheel 520 to perform reciprocating eccentric rotation. This active space 512 can also serve as an adjustment space for the relative position adjustment between the eccentric wheel 520 and the swing member 510, thereby enabling small-amplitude position adjustments within the transmission structure 300 to reduce the occurrence of jamming during operation of the sagittal saw; thus improving the stability of the surgical procedure and preventing medical accidents.

[0056] Further, see Appendix Figure 3-4 The eccentric assembly 500 also includes an eccentric axle 530 and a first bearing housing (not shown in the attached drawings). The front end of the eccentric axle 530 is connected to the eccentric wheel component 520, and the eccentric axle 530 is fitted into the first bearing housing. The eccentric axle 530 is rotatably connected to the handle body 200 through the first bearing housing. This configuration, by rotatably connecting the eccentric axle 530 to the handle body 200 through the first bearing housing, allows the eccentric wheel component 520 connected to the eccentric axle 530 to smoothly perform reciprocating eccentric rotational motion relative to the handle body 200, thus ensuring the successful implementation of the technical solution of this application.

[0057] Further, see Appendix Figure 3-4The transmission structure 300 includes a gear assembly 400, and the rotary drive device drives the eccentric wheel 520 to perform eccentric reciprocating motion through the gear assembly 400. The gear assembly 400 has many specific structures. In this embodiment, the gear assembly 400 includes an external gear 410 and an internal gear ring 420. The external gear 410 is located on the inner side of the internal gear ring 420 and meshes with the internal gear ring 420 for transmission. The external gear 410 is connected to the drive end of the rotary drive device, and the internal gear ring 420 is fixedly connected to the rear end of the eccentric wheel shaft 530 through a connecting disc 430. With this configuration, the gear assembly 400 is formed by combining the external gear 410 and the internal gear ring 420 to reduce the rotational driving force of the rotary drive device to a level that meets the requirements of plastic surgery. Then, the connecting disc 430 drives the eccentric wheel shaft 530 to reciprocate, which in turn drives the eccentric wheel 520 to reciprocate eccentric rotation. This embodiment has a simple structure and strong practicality.

[0058] As a preferred embodiment of the above embodiments, refer to the appendix. Figure 5-6 The handle body 200 has a connecting structure 700 installed inside. The connecting structure 700 is used to connect the transmission structure 300 to the drive end of the rotary drive device. Specifically, the connecting structure 700 includes a connecting sleeve 710 and a connecting shaft tube 720 arranged coaxially. The rear end of the connecting sleeve 710 is used to connect to the drive end of the rotary drive device. The front end of the connecting sleeve 710 is slidably sleeved on the rear end of the connecting shaft tube 720. The connecting sleeve 710 can slide relative to the connecting shaft tube 720. The front end of the connecting shaft tube 720 is fixedly connected to the external gear 410. A fixing ring 730 is fixedly sleeved on the connecting shaft tube 720. A first spring 740 is sleeved on the connecting shaft tube 720. The first spring 740 is disposed between the fixing ring 730 and the rear end of the connecting sleeve 710. With this configuration, the first spring 740 provides a certain elastic movement space between the connecting sleeve 710 and the connecting shaft tube 720. Thus, when the rotary drive device is connected to the rear end of the connecting sleeve 710, the connecting sleeve 710 can move forward a short distance along the connecting shaft tube 720. In other words, there is a buffer space between the connecting sleeve 710 and the connecting shaft tube 720, which avoids rigid contact between the rotary drive device and the handle body 200, thus preventing damage to the transmission structure 300.

[0059] Furthermore, the connecting structure 700 also includes a second bearing seat 750, which is fitted onto the connecting shaft tube 720. The connecting shaft tube 720 is rotatably connected to the handle body 200 through the second bearing seat 750. With this configuration, the connecting shaft tube 720 can rotate smoothly relative to the handle body 200 through the second bearing seat 750, resulting in a simple structure and strong practicality.

[0060] Furthermore, a limiting groove 711 is provided at the front end of the connecting sleeve 710, and the groove direction of the limiting groove 711 is arranged along the axial direction of the connecting sleeve 710; a limiting pin 721 is fixedly provided at the rear end of the connecting shaft tube 720, and the limiting pin 721 is slidably connected in the limiting groove 711. This configuration serves two purposes. First, since the limiting pin 721 is fixedly mounted on the connecting shaft tube 720 and its end is located in the limiting groove 711 of the connecting sleeve 710, when the rotary drive device drives the connecting sleeve 710 to reciprocate, the limiting pin 721 can also drive the connecting shaft tube 720 to reciprocate, ensuring that the rotary drive device can smoothly drive the external gear 410 to rotate. Second, since the limiting pin 721 is restricted from sliding in the limiting groove 711, the displacement of the connecting sleeve 710 relative to the connecting shaft tube 720 is limited, so that the connecting sleeve 710 and the connecting shaft tube 720 form a whole, preventing them from separating due to excessive displacement.

[0061] As a preferred embodiment of the above embodiments, the medical orthopedic sagittal saw handpiece includes a mounting structure 800, which is used to fix the handle portion 120 to the drive shaft tube 600; specifically, refer to the attached drawing. Figure 7-11The mounting structure 800 includes a mounting cavity 610 disposed at the front end of the drive shaft tube 600. The mounting cavity 610 is used to sleeve the tool holder portion 120, and the inner side of the mounting cavity 610 is in contact with the outer side of the tool holder portion 120 to restrict the radial movement of the tool holder portion 120. The end of the tool holder portion 120 away from the blade portion 110 is provided with a limiting member 130, and a notch 131 is provided at the connection between the limiting member 130 and the tool holder portion 120. The mounting structure 800 also includes a first positioning block 810 and a second positioning block 820. The first positioning block 810 is fixedly disposed in the mounting cavity 610 and is used to be embedded in the notch 131 to restrict the axial movement of the tool holder portion 120. The second positioning block 820 is slidably connected to the mounting cavity 610 and is used to abut against the side of the limiting member 130 to restrict the circumferential movement of the tool holder portion 120. With this configuration, the tool holder 120 is made into a cylindrical structure. When the tool holder 120 is fitted into the mounting cavity 610, the inner side of the mounting cavity 610 fits against the outer side of the tool holder 120, thus restricting the radial movement of the tool holder 120. Simultaneously, a first positioning block 810 and a second positioning block 820 are provided inside the mounting cavity 610. After the tool holder 120 is installed into the mounting cavity 610, on the one hand, the first positioning block 810 is embedded in the notch 131. At this time, both sides of the first positioning block 810 abut against the opposite ends of the tool holder 120 and the limiting member 130, respectively, preventing the tool body 100 from axially moving under the restriction of the first positioning block 810. On the other hand, the second positioning block 820 slides to abut against the side of the limiting member 130. Due to the obstruction of the second positioning block 820, the limiting member 130 cannot rotate along the axis of the tool holder 120, thus restricting the circumferential movement of the tool holder 120. In summary, the radial, axial, and circumferential movements of the tool holder 120 are all restricted, preventing the tool body 100 from displacing relative to the transmission shaft tube 600, thus ensuring the strong connection between the tool body 100 and the transmission structure 300.

[0062] Furthermore, a preset gap 830 is provided between the first positioning block 810 and the mounting cavity 610. The cross-sectional area of ​​the preset gap 830 is larger than that of the limiting member 130, and smaller than that of the tool holder portion 120. This arrangement allows the limiting member 130 to pass through the preset gap 830, while preventing the tool holder portion 120 from passing through it. After the limiting member 130 passes through the preset gap 830, the tool body 100 is rotated by a certain angle, causing the notch 131 of the limiting member 130 to engage with the first positioning block 810, thereby achieving the purpose of the first positioning block 810 restricting the axial movement of the tool holder portion 120.

[0063] Furthermore, the mounting structure 800 also includes a sliding ring 840 slidably sleeved on the drive shaft tube 600. The drive shaft tube 600 has a sliding groove 620, and the groove of the sliding groove 620 is arranged along the axial direction of the drive shaft tube 600. A connecting pin 850 is slidably connected in the sliding groove 620, and the sliding ring 840 is fixedly connected to the second positioning block 820 through the connecting pin 850. A second spring 860 is provided in the mounting cavity 610, and the second spring 860 is disposed between the second positioning block 820 and the rear end of the drive shaft tube 600. With this configuration, when the tool holder 120 is inserted into the mounting cavity 610, its limiting member 130 passes through the preset gap 830 and abuts against the end of the second positioning block 820. As the tool holder 120 continues to be inserted, the limiting member 130 drives the second positioning block 820 to move towards the rear end of the drive shaft tube 600, during which the second positioning block 820 compresses the second spring 860. When the tool body 100 rotates a certain angle so that the notch 131 of the limiting member 130 engages with the first positioning block 810, the limiting member 130 is rotated to the point where it no longer abuts against the end of the second positioning block 820, and the second positioning block 820, lacking the limiting member, is thus secured. The second positioning block 820 abuts against the limiting member 130, thereby moving towards the front end of the transmission shaft tube 600 under the elastic force of the second spring 860, so that the side of the second positioning block 820 abuts against the limiting member 130. Since the second positioning block 820 is connected to the sliding ring 840 through the connecting pin 850, and the connecting pin 850 is restricted to sliding in the sliding groove 620 of the transmission shaft tube 600, the movement trajectory of the second positioning block 820 can only move along the axial direction of the transmission shaft tube 600, and cannot move circumferentially. Thus, the limiting member 130 abutted against by the second positioning block 820 cannot move circumferentially, so as to achieve the purpose of restricting the circumferential movement of the tool holder 120.

[0064] As an alternative to the connecting pin, in another embodiment, the blade mounting structure can be designed to include a connecting bolt and a connecting nut. The connecting bolt passes sequentially through the sliding groove, the sliding ring, and the second positioning block before being threaded onto the connecting nut. This configuration allows the sliding ring and the second positioning block to combine into a single unit through the combination of the connecting bolt and the connecting nut, enabling sliding movement along the sliding groove. Understandably, through holes are provided in the sliding ring and the second positioning block for the connecting bolt to pass through, ensuring that the connecting bolt can smoothly pass through the moving ring and the second positioning block.

[0065] As a preferred embodiment of the above embodiments, refer to the appendix. Figure 7-11The mounting structure 800 also includes a push sleeve assembly 900, which allows the operator to slide the sliding ring 840. This arrangement is designed so that when replacing the tool body 100, the restriction of the second positioning block 820 on the limiting member 130 needs to be released first, allowing the tool holder 120 to rotate circumferentially until its limiting member 130 aligns with the preset gap 830, so that the limiting member 130 can pass through the preset gap 830 and pull the tool holder 120 out of the drive shaft tube 600. Therefore, the operator needs to slide the sliding ring 840 to move the second positioning member towards the rear end of the drive shaft tube 600, thereby releasing the restriction of the second positioning block 820 on the limiting member 130. To facilitate the operator's sliding operation of the sliding ring 840, this embodiment provides a push sleeve assembly 900 on the mounting structure 800.

[0066] Specifically, the push sleeve assembly 900 includes a guide sleeve 910 slidably sleeved on the drive shaft tube 600, and a push sleeve 920 slidably sleeved on the front end of the guide sleeve 910. At least a portion of the push sleeve 920 is exposed outside the handle body 200. The guide sleeve 910 is fixedly connected to the handle body 200, and the rotating pin 630 is rotatably connected to the guide sleeve 910. Understandably, since the drive shaft tube 600 needs to perform a reciprocating arc-shaped oscillating motion around the rotating pin 630, a push sleeve 920 is slidably sleeved on the drive shaft tube 600 and the guide sleeve 910. A swing gap is provided between the transmission shaft tube 600 to allow it to perform reciprocating arc swing motion, so as to ensure that the transmission shaft tube 600 will not be obstructed during the reciprocating arc swing motion; the guide sleeve 910 is provided with a guide groove 911, and the groove of the guide groove 911 is arranged along the axial direction of the transmission shaft tube 600; a push pin 930 is slidably connected in the guide groove 911, one end of the push pin 930 is fixedly connected to the push assembly 920, and the other end of the push pin 930 abuts against the end of the sliding ring 840 away from the second spring 860. With this configuration, at least a portion of the push assembly 920 in this embodiment is exposed outside the handle body 200. The operator slides the push assembly 920 through its exposed area, causing it to move towards the rear end of the drive shaft tube 600. Since the push assembly 920 is connected to a push pin 930, during the movement of the push assembly 920, the push pin 930 pushes the sliding ring 840 towards the rear end of the drive shaft tube 600, thereby releasing the second positioning block 820 from restricting the limiting member 130. At the same time, since the push pin 930 is restricted to sliding in the guide groove 911 of the guide sleeve 910, and the groove of the guide groove 911 is arranged along the axial direction of the drive shaft tube 600, the push assembly 920 can only move along the axial direction of the drive shaft tube 600 when pushed by the operator, which helps to improve the guiding performance of the push assembly 920 during movement.

[0067] Furthermore, two push pins 930 are provided, and the two push pins 930 are symmetrically arranged on opposite sides of the guide sleeve 910. Correspondingly, two guide grooves 911 are also provided. This arrangement ensures that the sliding ring 840 is subjected to balanced forces on both sides when the push pins 930 push it, which helps to improve the smoothness of the sliding ring 840 during sliding.

[0068] Furthermore, a limiting ring 940 is provided at the rear end of the guide sleeve 910, and a third spring 950 is fitted on the guide sleeve 910. The third spring 950 is located between the push assembly 920 and the limiting ring 940. With this configuration, during the process of the push assembly 920 being pushed towards the rear end of the transmission shaft tube 600, the push assembly 920 compresses the third spring 950. After the tool body 100 and the handle body 200 are separated, the operator releases the force applied to the push assembly 920. At this time, the push assembly 920 resets under the elastic force of the third spring 950, and the second positioning block 820 also resets under the elastic force of the second spring 860.

[0069] Furthermore, the exposed area of ​​the push assembly 920 is provided with anti-slip texture 921. This design increases the friction between the operator and the push assembly 920 through the anti-slip texture 921, thereby facilitating the operator to push the push assembly 920.

[0070] The disassembly and assembly process of the tool body 100 and the handle body 200 is described in detail below with reference to the above embodiments:

[0071] When the tool body 100 is installed:

[0072] Step ①: Refer to the appendix Figure 12 The tool holder 120 of the tool body 100 is inserted into the mounting cavity 610 of the drive shaft tube 600 located inside the handle body 200. Since the inner side of the mounting cavity 610 fits against the outer side of the tool holder 120, the radial movement of the tool holder 120 is restricted. At this time, the limiting member 130 of the tool holder 120 and the preset gap 830 between the first positioning block 810 and the mounting cavity 610 are aligned with each other.

[0073] Step 2: Refer to the appendix Figure 13 As the handle portion 120 continues to be inserted, its limiting member 130 passes through the preset gap 830 until the first positioning block 810 abuts against the end of the handle portion 120; during this period, after the limiting member 130 passes through the preset gap 830, it abuts against the end of the second positioning block 820, and as the handle portion 120 continues to be inserted, the limiting member 130 drives the second positioning block 820 to move towards the rear end of the transmission shaft tube 600, during which the second positioning block 820 compresses the second spring 860;

[0074] Step 3: Refer to the appendix Figure 14-15 The tool body 100 is rotated by a certain angle. On the one hand, the notch 131 of the limiting member 130 is engaged with the first positioning block 810 to restrict the axial movement of the tool holder 120. On the other hand, the limiting member 130 is rotated so that it does not abut against the end of the second positioning block 820. Since the second positioning block 820 lacks the abutment of the limiting member 130, it moves towards the front end of the transmission shaft tube 600 under the elastic force of the second spring 860, so that the side of the second positioning block 820 abuts against the limiting member 130. Since the second positioning block 820 cannot move circumferentially, the circumferential movement of the tool holder 120 is restricted. This completes the installation operation of the tool body 100.

[0075] When disassembling the tool body 100:

[0076] Step 4: Push the push assembly 920 toward the rear end of the drive shaft tube 600. The push assembly 920 pushes the sliding ring 840 toward the rear end of the drive shaft tube 600 through the push pin 930. The sliding ring 840 and the second positioning block 820 are connected to each other through the connecting pin 850. Therefore, the second positioning block 820 also moves toward the rear end of the drive shaft tube 600 at the same time. Thus, the second positioning block 820 releases the restriction on the limiting member 130, that is, the second positioning block 820 releases the restriction on the circumferential movement of the tool body 100.

[0077] Step 5: Move the tool body 100 in the circumferential direction until the limiting member 130 is aligned with the preset gap 830. At this time, the notch 131 is released from mutual engagement with the first positioning block 810, that is, the first positioning block 810 releases the restriction on the axial movement of the tool body 100.

[0078] Step 6: Move the tool holder 120 toward the front end of the drive shaft tube 600. At this time, the limiting member 130 can pass through the preset gap 830 until the tool holder 120 and the drive shaft tube 600 are separated, thereby completing the disassembly operation of the tool body 100. Then the push assembly 920 is reset under the elastic force of the third spring 950, and the second positioning block 820 is also reset under the elastic force of the second spring 860.

[0079] It should be noted that the other contents of the medical orthopedic sagittal saw handpiece disclosed in this utility model are existing technologies and will not be described in detail here.

[0080] The above are merely optional embodiments of this utility model and do not limit the patent scope of this utility model. Any application of this utility model directly or indirectly in other related technical fields is included within the patent protection scope of this utility model.

Claims

1. A medical sagittal sawing apparatus for orthopedic surgery, characterized in that, The medical orthopedic sagittal saw handpiece includes: The tool body includes a blade portion and a shank portion connected together; The handle body has a front end for connecting to the knife handle portion and a rear end for connecting to an external rotary drive device. A transmission structure is installed inside the handle body so that the rotary drive device can drive the tool body to perform a reciprocating arc-shaped oscillating motion through the transmission structure. Specifically, the transmission structure includes an eccentric assembly and a transmission shaft tube; the eccentric assembly includes a swing member and an eccentric wheel member, the central axis and rotation axis of the eccentric wheel member being located on different straight lines; the swing member has a recessed swing groove, the groove direction of which is arranged radially along the transmission shaft tube; the eccentric wheel member is disposed in the swing groove, wherein the swing groove has an active space for the eccentric wheel member to perform reciprocating eccentric rotation, at least a portion of the outer side surface of the eccentric wheel member is in contact with the inner sidewall of the swing groove; the eccentric wheel member can perform reciprocating eccentric rotation under the drive of the rotary drive device; the transmission shaft tube has rotating shaft pins on opposite sides of its middle section, and the transmission shaft tube is rotatably connected to the handle body through the rotating shaft pins; the front end of the transmission shaft tube is connected to the tool holder, and the rear end of the transmission shaft tube is fixedly connected to the swing member.

2. The medical sagittal saw according to claim 1, wherein: The eccentric assembly further includes an eccentric wheel shaft and a first bearing housing. The front end of the eccentric wheel shaft is connected to the eccentric wheel component, and the eccentric wheel shaft is fitted into the first bearing housing. The eccentric wheel shaft is rotatably connected to the handle body through the first bearing housing.

3. The medical sagittal saw according to claim 2, wherein: The transmission structure includes a gear assembly, and the rotary drive device drives the eccentric wheel to perform eccentric reciprocating motion through the gear assembly. Specifically, the gear assembly includes an external gear and an internal gear ring. The external gear is located on the inner side of the internal gear ring and meshes with the internal gear ring for transmission. The external gear is connected to the drive end of the rotary drive device, and the internal gear ring is fixedly connected to the rear end of the eccentric wheel shaft through a connecting disc.

4. The medical sagittal saw according to claim 3, wherein: The handle body has a connecting structure installed inside, which is used to connect the transmission structure to the drive end of the rotary drive device. Specifically, the connection structure includes a connecting sleeve and a connecting shaft tube arranged coaxially. The rear end of the connecting sleeve is used to connect to the driving end of the rotary drive device. The front end of the connecting sleeve is slidably sleeved on the rear end of the connecting shaft tube, and the connecting sleeve can slide relative to the connecting shaft tube. The front end of the connecting shaft tube is fixedly connected to the external gear. A fixing ring is fixedly sleeved on the connecting shaft tube, and a first spring is sleeved on the connecting shaft tube. The first spring is disposed between the fixing ring and the rear end of the connecting sleeve.

5. The medical sagittal saw according to claim 4, wherein: The connecting structure further includes a second bearing seat, which is fitted onto the connecting shaft tube; the connecting shaft tube is rotatably connected to the handle body via the second bearing seat. Furthermore, a limiting groove is provided at the front end of the connecting sleeve, and the groove direction of the limiting groove is arranged along the axial direction of the connecting sleeve; a limiting pin is fixedly provided at the rear end of the connecting shaft tube, and the limiting pin is slidably connected in the limiting groove.

6. The medical sagittal saw according to claim 1, wherein: The medical orthopedic sagittal saw includes a mounting structure, which is used to fix the handle to the drive shaft tube. Specifically, the mounting structure includes a mounting cavity disposed at the front end of the drive shaft tube, the mounting cavity being used to sleeve the tool holder portion, and the inner side of the mounting cavity and the outer side of the tool holder portion fitting together to restrict the radial movement of the tool holder portion; The tool holder portion has a limiting member at its end away from the blade portion, and a notch is provided at the connection between the limiting member and the tool holder portion. The mounting structure also includes a first positioning block and a second positioning block. The first positioning block is fixedly disposed in the mounting cavity and is used to be embedded in the notch to restrict the axial movement of the tool holder portion. The second positioning block is slidably connected to the mounting cavity and is used to abut against the side of the limiting member to restrict the circumferential movement of the tool holder portion.

7. The medical orthopedic sagittal saw handpiece as described in claim 6, characterized in that: There is a preset gap between the first positioning block and the mounting cavity. The cross-sectional area of ​​the preset gap is greater than the cross-sectional area of ​​the limiting member, and the cross-sectional area of ​​the preset gap is less than the cross-sectional area of ​​the handle portion.

8. The medical sagittal saw according to claim 6, wherein: The mounting structure further includes a sliding ring slidably sleeved on the drive shaft tube, the drive shaft tube having a sliding groove, the groove being oriented along the axial direction of the drive shaft tube; a connecting pin is slidably connected in the sliding groove, and the sliding ring is fixedly connected to the second positioning block via the connecting pin; a second spring is provided in the mounting cavity, the second spring being located between the second positioning block and the rear end of the drive shaft tube.

9. The medical sagittal saw according to claim 8, wherein: The mounting structure further includes a push sleeve assembly for the operator to slide the sliding ring. Specifically, the push sleeve assembly includes a guide sleeve slidably fitted onto the drive shaft tube, and a push sleeve slidably fitted onto the front end of the guide sleeve. At least a portion of the push sleeve is exposed outside the handle body. The guide sleeve is fixedly connected to the handle body, and the rotating shaft pin is rotatably connected to the guide sleeve. The guide sleeve has a guide groove, the groove of which is axially aligned with the drive shaft tube. A push pin is slidably connected in the guide groove, one end of which is fixedly connected to the push sleeve, and the other end of which abuts against the end of the sliding ring away from the second spring.

10. The medical orthopedic sagittal saw handpiece as described in claim 9, characterized in that: The guide sleeve is provided with a limit ring at its rear end, and a third spring is sleeved on the guide sleeve, with the third spring disposed between the pusher assembly and the limit ring; Furthermore, the exposed area of ​​the push kit is provided with anti-slip texture.

Images