Guards and osteotomes

Abstract

The application discloses a sheath and a bone saw device, the sheath comprising a connecting sleeve, a sheath body and a positioning structure. The connecting sleeve is used for sleeving the bone saw handle. The sheath body is connected to the connecting sleeve. The positioning structure is integrally formed with the sheath body or the connecting sleeve, and is used for fixedly matching with the bone saw handle. Thus, compared with the sheath in the prior art, the application integrally forms the positioning structure with the sheath body or the connecting sleeve, thereby omitting the complex assembly steps of fixing by relying on independent fasteners such as additional bolts in the prior art, and helping to simplify the installation process of the sheath and the bone saw handle of the bone saw device, and significantly improving the assembly efficiency and operation convenience.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a protective sheath and bone saw device. Background Technology

[0002] Bone saws are crucial medical instruments used in surgery to cut the sternum, and their operational precision and safety directly affect surgical outcomes and patient safety. To prevent bone fragments from flying during surgery, protect surrounding tissues, and improve operational stability, a protective sheath is typically fitted onto the bone saw. This sheath generally consists of a connecting sleeve and a sheath body. The connecting sleeve is used to fit over the bone saw handpiece of the bone saw, while the sheath body extends into the saw blade's working area to provide protection. To ensure that the sheath does not shift or detach during high-speed vibration and cutting, it must be securely fixed to the bone saw handpiece.

[0003] However, in related technologies, the fixation between the sheath and the bone saw handpiece usually relies on an additional assembly pin structure, which requires the assembler to perform multiple steps such as aligning the holes, inserting the pin, and locking when installing the sheath, resulting in a cumbersome and time-consuming assembly process. Utility Model Content

[0004] This application provides a sheath and bone saw device that can solve at least one of the above-mentioned technical problems.

[0005] In a first aspect, embodiments of this application provide a protective sheath, comprising:

[0006] A connecting sleeve is fitted over the bone saw handpiece;

[0007] Sheath body, the sheath body being connected to the connecting sleeve; and

[0008] A positioning structure is integrally formed with the sheath body or the connecting sleeve, and the positioning structure is used to fix and cooperate with the bone saw handpiece.

[0009] In some embodiments, the front end of the sheath body is provided with a protective cap, the rear end of the sheath body is inserted into the connecting sleeve and integrally formed with the positioning structure, and the positioning structure is located inside the connecting sleeve.

[0010] In some embodiments, the connecting sleeve has a receiving space and a insertion slot. The receiving space is for the bone saw to pass through, and the insertion slot communicates with the receiving space and is located on the periphery of the connecting sleeve. The insertion slot has an insertion port located at the end of the connecting sleeve, and the rear end of the sheath body is inserted into the insertion slot from the insertion port so that the positioning structure is located inside the connecting sleeve.

[0011] In some embodiments, the sheath body and the edge of the insertion slot enclose a solder receiving groove, which is located outside the receiving space.

[0012] In some embodiments, a locking sleeve and a locking member are also included. The connecting sleeve has a through-hole along the cylinder wall, and the locking member is movably disposed in the through-hole. The locking sleeve is sleeved outside the connecting sleeve, and the locking sleeve is movable relative to the connecting sleeve between a first position and a second position.

[0013] When the locking sleeve moves to the first position, the locking sleeve presses the locking member against the outer wall of the bone saw handpiece, and the connecting sleeve locks with the bone saw handpiece.

[0014] When the locking sleeve moves to the second position, the locking sleeve releases the locking member from pressing against the outer wall of the bone saw, and the connecting sleeve is unlocked from the bone saw.

[0015] In some embodiments, the rear end of the sheath body protrudes radially from the outer surface of the connecting sleeve, the outer surface of the connecting sleeve is provided with a limiting protrusion, the rear end of the sheath body is opposite to the limiting protrusion and spaced apart, and the locking sleeve is provided with a stop protruding on one side of the connecting sleeve, the stop being located between the rear end of the sheath body and the limiting protrusion.

[0016] In some embodiments, the sheath further includes a damping element that extends circumferentially along the connecting sleeve and abuts between the locking sleeve and the connecting sleeve.

[0017] In some embodiments, the locking sleeve or the connecting sleeve is provided with a limiting groove, and a portion of the damping element is embedded in the limiting groove.

[0018] Secondly, embodiments of this application provide a bone saw device, comprising:

[0019] The sheath of any of the above embodiments; and

[0020] The bone saw handpiece has a mating structure that is fixedly fitted with the positioning structure.

[0021] In some implementations, there are multiple mating structures arranged circumferentially along the bone saw handpiece, and the positioning structure can be fixedly mated with one of the mating structures.

[0022] This application provides a protective sheath and a bone saw device. The protective sheath includes a connecting sleeve, a sheath body, and a positioning structure. The connecting sleeve is used to fit over the bone saw handpiece. The sheath body is connected to the connecting sleeve. The positioning structure is integrally formed with the sheath body or the connecting sleeve, and is used to fix and cooperate with the bone saw handpiece. Thus, compared with the protective sheaths in related technologies, this application eliminates the complex assembly steps that rely on additional fasteners such as additional pins for fixation by integrally forming the positioning structure with the sheath body or the connecting sleeve in related technologies. This helps to simplify the installation process between the protective sheath and the bone saw handpiece of the bone saw device, significantly improving assembly efficiency and ease of operation. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application 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 application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of the protective sheath provided in an embodiment of this application.

[0025] Figure 2 for Figure 1 A schematic diagram of the dissociated structure of the middle protective sheath.

[0026] Figure 3 for Figure 1 A cross-sectional view of the middle protective sheath.

[0027] Figure 4 This is a schematic diagram of the bone saw device provided in an embodiment of this application.

[0028] Figure 5 for Figure 4 A cross-sectional view of a medium bone saw.

[0029] Figure 6 for Figure 5 Enlarged schematic diagram of point P in the middle.

[0030] Explanation of icon numbers:

[0031] 10. Sheath; 20. Bone saw; 100. Connecting sleeve; 110. Accommodating space; 120. Insertion groove; 130. Insertion port; 140. Solder receiving groove; 150. Mounting through hole; 160. Limiting protrusion; 200. Sheath body; 300. Positioning structure; 400. Locking sleeve; 410. Limiting groove; 420. Stop; 500. Locking component; 600. Damping component; 700. Bone saw handpiece; 710. Mating structure; 800. Saw blade;

[0032] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0034] In the following description, when referring to the accompanying drawings, the same numbers in different drawings denote the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0035] In the description of this application, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Furthermore, in the description of this application, unless otherwise stated, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0037] Please see Figure 1 and Figure 2 This application provides a protective sheath 10, which includes a connecting sleeve 100, a sheath body 200, and a positioning structure 300. The connecting sleeve 100 is used to fit over a bone saw handpiece 700. The sheath body 200 is connected to the connecting sleeve 100. The positioning structure 300 is integrally formed with the sheath body 200 or the connecting sleeve 100, and is used to fix and cooperate with the bone saw handpiece 700.

[0038] Thus, compared to the protective sheaths in related technologies, this application integrates the positioning structure 300 with the sheath body 200 or the connecting sleeve 100, eliminating the complex assembly steps that rely on additional fasteners such as pins for fixing in related technologies. This helps to simplify the installation process between the protective sheath 10 and the bone saw handpiece 700 of the bone saw device 20, significantly improving assembly efficiency and ease of operation.

[0039] The connecting sleeve 100 is used to fit over the bone saw handpiece 700 of the bone saw device 20. Its inner diameter matches the outer contour of the bone saw handpiece 700 at a certain position, ensuring that the connecting sleeve 100 can securely fit the bone saw handpiece 700. The sheath body 200 extends from one end of the connecting sleeve 100 and covers the vicinity of the working area of ​​the saw blade 800, serving as an isolation and guide to prevent debris or liquid generated during the operation from contaminating the surgical field or damaging adjacent tissues.

[0040] The positioning structure 300 and the sheath body 200 or connecting sleeve 100 are manufactured using an integral molding process, eliminating the need for additional independent fastening components. The positioning structure 300 can take the form of a protrusion, snap-fit, groove, or guide rib, etc., and its geometry precisely matches the corresponding mating parts on the bone saw handpiece 700 of the bone saw device 20. During installation, the operator only needs to fit the connecting sleeve 100 onto the bone saw handpiece 700 body and assemble the sheath body 200 with the connecting sleeve 100. Fixing is achieved through the direct mating between the positioning structure 300 and the bone saw handpiece 700, without requiring multiple steps such as drilling, pinning, or locking.

[0041] In some embodiments, the front end of the sheath body 200 is provided with a protective cap, which covers and guides the working end of the saw blade while forming a physical barrier over the cutting area. The shape of the protective cap is optimized according to the sternal anatomy and surgical requirements.

[0042] The rear end of the sheath body 200 is inserted into the connecting sleeve 100, forming a stable mechanical connection. The sheath body 200 has an insertion part at its end, and the connecting sleeve 100 has a corresponding slot or receiving cavity. The two are quickly aligned and initially fixed through axial or radial engagement. This insertion structure not only facilitates assembly but also effectively transmits loads, preventing relative displacement or loosening of the sheath body 200 due to vibration during the high-speed operation of the bone saw handpiece 700.

[0043] The rear end of the sheath body 200 is integrally formed with the positioning structure 300, which is located inside the connecting sleeve 100. The positioning structure 300 can take the form of a protrusion, hook, guide rib, elastic arm, or annular step, and its shape precisely matches the mating parts on the outer surface of the bone saw handpiece 700. During the installation of the sheath 10, the connecting sleeve 100 is fitted onto the outside of the bone saw handpiece 700, and the positioning structure 300 then embeds into the corresponding groove, hole, or limiting surface on the bone saw handpiece 700, achieving reliable fixation between the sheath 10 and the main unit.

[0044] In some embodiments, the connecting sleeve 100 is provided with a receiving space 110, which extends axially for the bone saw handpiece 700 to pass through. The inner contour of the receiving space 110 matches the outer surface of the bone saw handpiece 700, ensuring that the sheath 10 fits tightly against the main unit after installation, preventing shaking or displacement.

[0045] The connecting sleeve 100 has a circumferential insertion groove 120, which communicates with the receiving space 110, providing an assembly channel for the rear end of the sheath body 200. The insertion groove 120 forms an insertion port 130 at the end of the connecting sleeve 100. This insertion port 130 is axially open, facilitating the radial or oblique insertion of the rear end of the sheath body 200 from the outside. During assembly, the operator aligns the rear end of the sheath body 200 with the insertion port 130 and pushes it into the insertion groove 120 until the sheath body 200 is fully embedded in the predetermined position. At this time, the positioning structure 300, integrally formed with the sheath body 200, enters the connecting sleeve 100 along with it and is finally positioned in the inner wall area of ​​the receiving space 110, ready to mate with the mating structure 710 on the bone saw handpiece 700.

[0046] Please see Figure 2 and Figure 3 In some embodiments, the sheath body 200 and the edge of the insertion groove 120 enclose a solder receiving groove 140, which is located outside the receiving space 110. After the rear end of the sheath body 200 is inserted into the insertion groove 120 of the connecting sleeve 100, its outer surface fits against the edge of the insertion groove 120, forming a closed or semi-closed annular cavity at their intersection, which constitutes the solder receiving groove 140. The solder receiving groove 140 is located outside the receiving space 110 of the connecting sleeve 100, that is, outside the area through which the bone saw handpiece 700 passes, ensuring that the welding process does not affect the assembly or operation of the main unit.

[0047] The cross-sectional shape of the solder receiving groove 140 is optimized according to the mating contour of the sheath body 200 and the insertion groove 120. It is usually U-shaped, V-shaped, or rectangular, with clear boundaries and sufficient volume to accommodate medical-grade solder. During manufacturing, the solder is injected into the groove by dispensing, injection molding, or capillary filling. Subsequently, laser welding, hot melt welding, or ultrasonic welding processes are used to firmly connect the sheath body 200 and the connecting sleeve 100. After solidification, the solder forms a high-strength metallurgical or polymer bonding layer, significantly improving the structural rigidity and fatigue resistance of the insertion part.

[0048] Please see Figure 2 , Figure 5 and Figure 6 In some embodiments, the sheath 10 further includes a locking sleeve 400 and a locking element 500, forming a mechanical connection structure that can be quickly locked and released.

[0049] The connecting sleeve 100 has a through-hole 150 extending through the sleeve wall. The through-hole 150 radially penetrates the connecting sleeve 100, and the locking member 500 is movably disposed within the through-hole 150. The through-hole 150, which provides installation space and a movement channel for the locking member 500, is located on the sleeve wall of the connecting sleeve 100. The position of the through-hole 150 corresponds to the mating part on the bone saw handpiece 700, ensuring that the locking member 500 can accurately act on the surface of the bone saw handpiece 700 or the pre-set groove.

[0050] The locking element 500 is movably disposed within the mounting through hole 150 and is capable of reciprocating in the radial direction. One end of the locking element 500 extends toward the interior of the connecting sleeve 100 to contact and clamp the bone saw handpiece 700; the other end is located on the outside of the connecting sleeve 100 to receive the force from the locking sleeve 400. The locking element 500 may be in the form of a pin, ball, wedge, or elastic claw, and may be configured with a compression spring, elastic washer, or other reset element as needed to ensure reliable retraction in the unlocked state.

[0051] The locking sleeve 400 is sleeved around the connecting sleeve 100 and is movable relative to the connecting sleeve 100 between a first position and a second position. The locking sleeve 400 is slidably sleeved around the outer periphery of the connecting sleeve 100, and its overall structure is cylindrical, with an inner diameter slightly larger than the outer diameter of the connecting sleeve 100, allowing for smooth axial movement. The inner wall of the locking sleeve 400 has structural features such as a driving ramp, a cam profile, or a clamping step.

[0052] When the locking sleeve 400 moves to the first position, it presses the locking member 500 against the outer wall of the bone saw 700, locking the connecting sleeve 100 to the bone saw 700. Specifically, when the locking sleeve 400 slides to the first position, the inner wall structure of the locking sleeve 400 applies radial inward pressure to the locking member 500, forcing it to pass through the mounting hole 150 and advance towards the outer wall of the bone saw 700. At this time, the locking member 500 simultaneously engages with the mating interface between the connecting sleeve 100 and the bone saw 700, forming a stable three-point or double-sided clamping locking state, effectively preventing the sheath 10 from loosening, rotating, or falling off during high-speed vibration or cutting processes.

[0053] When the locking sleeve 400 moves to the second position, the locking sleeve 400 releases the pressure of the locking member 500 against the outer wall of the bone saw handpiece 700, and the connecting sleeve 100 is unlocked from the bone saw handpiece 700, allowing the connecting sleeve 100 to be detached from the bone saw handpiece 700. When it is necessary to remove the sheath 10, the operator slides the locking sleeve 400 axially to the second position. In this position, the inner wall of the locking sleeve 400 no longer applies radial pressure to the locking member 500, and the locking member 500 can retract into the mounting through hole 150 under gravity, disengaging from contact with the bone saw handpiece 700. The mechanical locking relationship between the connecting sleeve 100 and the bone saw handpiece 700 is then released, and the sheath 10 can be easily removed from the bone saw device 20 for postoperative cleaning, high-temperature and high-pressure sterilization, or replacement.

[0054] In some embodiments, the locking sleeve 400 has a stop portion 420 protruding from the side facing the connecting sleeve 100. The stop portion 420 extends axially to limit the travel range of the locking sleeve 400 during sliding. The stop portion 420 may be in the form of an annular flange, a partial protrusion, or multiple spaced limiting ribs. Its position corresponds to a specific structure on the outer surface of the connecting sleeve 100, ensuring that the locking sleeve 400 moves accurately and stays stably between a first position and a second position.

[0055] The rear end of the sheath body 200 protrudes radially from the outer surface of the connecting sleeve 100. The outer surface of the connecting sleeve 100 is provided with a limiting protrusion 160. The rear end of the sheath body 200 and the limiting protrusion 160 are opposite to each other and spaced apart. The rear end of the sheath body 200 protrudes radially outward from the connecting sleeve 100, forming a distinct radial protrusion structure. The rear end of the sheath body 200 not only serves as a transitional area between the sheath body 200 and the connecting sleeve 100 but also performs a partial mechanical limiting function. The outer surface of the connecting sleeve 100 has independent limiting protrusions 160 in corresponding areas. These limiting protrusions 160 also extend radially outward and are circumferentially opposite to and spaced apart from the rear end of the sheath body 200, forming an axially penetrating gap space between them.

[0056] The stop portion 420 is located between the rear end of the sheath body 200 and the limiting protrusion 160. The stop portion 420 is precisely positioned within the gap between the rear end of the sheath body 200 and the limiting protrusion 160. When the locking sleeve 400 slides axially along the connecting sleeve 100, the stop portion 420 reciprocates between the rear end of the sheath body 200 and the limiting protrusion 160, thereby limiting the sliding stroke of the locking sleeve 400 within a preset range. This structure effectively prevents the locking sleeve 400 from disengaging from the connecting sleeve 100 due to excessive sliding, while ensuring that it can fully press the locking member 500 in the first position and completely release the locking member 500 in the second position.

[0057] This limiting relationship not only improves the operational reliability of the locking mechanism but also enhances the overall structural integration. The rear end of the sheath body 200, the limiting protrusion 160, and the stop 420 together form a closed or semi-closed guide channel, guiding the locking sleeve 400 to slide smoothly along a predetermined path, avoiding deviation or jamming. Furthermore, since all limiting structures are located outside the connecting sleeve 100, they do not affect the insertion and fixation of the bone saw handpiece 700, nor do they interfere with the normal operation of the internal transmission components.

[0058] In some embodiments, the locking sleeve 400 is threadedly connected to the connecting sleeve 100. The locking sleeve 400 and the connecting sleeve 100 achieve relative movement through a threaded connection. The outer surface of the connecting sleeve 100 has external threads, and the inner wall of the locking sleeve 400 has corresponding internal threads. The two form a rotatable and adjustable connection structure through the threaded pair. This threaded connection not only provides stable axial guidance but also allows the locking sleeve 400 to precisely switch between a first position and a second position through rotation.

[0059] When the operator rotates the locking sleeve 400 clockwise or counterclockwise, the threaded pair converts the rotational motion into axial displacement, driving the locking sleeve 400 to move along the axis of the connecting sleeve 100. During rotation to the first position, the locking sleeve 400 gradually approaches the end of the sheath body 200 and applies radial pressure to the locking member 500 within the mounting through hole 150 through its inner wall structure, forcing the locking member 500 to press against the bone saw handpiece 700, thereby achieving reliable locking between the connecting sleeve 100 and the bone saw handpiece 700. Conversely, when the locking sleeve 400 rotates in the opposite direction to the second position, the pressure on the locking member 500 is released, and the locking member 500 is no longer subject to the force of the locking sleeve 400, allowing the connecting sleeve 100 to be easily disassembled from the bone saw handpiece 700.

[0060] In some embodiments, the sheath 10 further includes a damping element 600, which extends circumferentially along the connecting sleeve 100 and abuts against the locking sleeve 400 and the connecting sleeve 100. The damping element 600 extends circumferentially along the connecting sleeve 100 and has an overall annular, arc-shaped segment, or multi-point distributed structure, installed within the mating gap between the locking sleeve 400 and the connecting sleeve 100. The outer surface of the damping element 600 contacts the inner wall of the locking sleeve 400, while its inner surface adheres to the outer circumferential surface of the connecting sleeve 100, forming a continuous or intermittent friction interface.

[0061] The damping element 600 is made of a material with moderate elasticity and wear resistance, such as medical-grade silicone, polyurethane, thermoplastic elastomers, or engineering plastics with a lubricating coating. This material property allows the damping element 600 to provide stable frictional resistance while preventing scratches or wear on the metal or polymer connecting sleeve 100 and locking sleeve 400. The cross-sectional shape of the damping element 600 can be circular, rectangular, D-shaped, or trapezoidal, and can be optimized according to the required damping force and assembly space.

[0062] When the locking sleeve 400 moves axially along the connecting sleeve 100, the damping element 600 generates uniform resistance to the movement of the locking sleeve 400 through the friction between its elastic deformation and the contact surface. This resistance effectively suppresses the swaying, rebound, or malfunction of the locking sleeve 400 caused by inertia or vibration, allowing the locking sleeve 400 to remain smoothly and controllably in the first or second position. Especially in the environment of high-frequency vibration of the equipment during surgery, the damping element 600 significantly improves the overall stability of the locking mechanism and prevents the locking state from being accidentally released.

[0063] In addition, the damping element 600 also serves as a buffer and seal. In the tiny gap formed between the locking sleeve 400 and the connecting sleeve 100, the damping element 600 can prevent contaminants such as blood, rinsing fluid, or bone fragments from entering the internal structure, reducing cleaning difficulty and extending the service life of the sheath 10.

[0064] In some embodiments, the locking sleeve 400 or the connecting sleeve 100 is provided with a limiting groove 410, and a portion of the damping element 600 is embedded in the limiting groove 410.

[0065] At least one component of the locking sleeve 400 or the connecting sleeve 100 is provided with a limiting groove 410, which extends circumferentially and is used to position and constrain the damping element 600. A portion of the damping element 600 is embedded in the limiting groove 410, while the remaining portion protrudes from the groove opening and remains in contact with the surface of another component that is moving relative to it, thereby providing damping force while preventing itself from undergoing axial or circumferential displacement.

[0066] The limiting groove 410 can be located on the outer circumferential surface of the connecting sleeve 100 or on the inner wall surface of the locking sleeve 400, depending on the assembly process and stress requirements. When the limiting groove 410 is located on the connecting sleeve 100, the damping element 600 is first fitted onto the connecting sleeve 100 and engaged in the limiting groove 410, and then the locking sleeve 400 is slidably fitted into it from one end. When the limiting groove 410 is located on the locking sleeve 400, the damping element 600 is pre-embedded in the inner wall of the locking sleeve 400 and then fitted onto the outside of the connecting sleeve 100. Both methods ensure that the damping element 600 remains stable during the use of the sheath 10, preventing it from falling off or becoming misaligned due to vibration or repeated sliding.

[0067] The cross-sectional shape of the limiting groove 410 matches the cross-section of the damping element 600, and can be rectangular, trapezoidal, dovetail-shaped, or semi-circular to enhance the fitting strength and limit the radial movement of the damping element 600. The bottom of the groove can be designed as a smooth plane or have micro-convex textures to adjust the compression and preload of the damping element 600. In some embodiments, both the locking sleeve 400 and the connecting sleeve 100 are provided with limiting grooves 410, and the two ends of the damping element 600 are respectively embedded in the grooves on both sides to form a double-sided fixing structure, further improving the installation reliability.

[0068] Please see Figure 4 and Figure 5 This application embodiment also includes a bone saw device 20, which includes a sheath 10 and a bone saw handpiece 700 as described in any of the above embodiments. The bone saw handpiece 700 is provided with a mating structure 710, which is fixedly mated with the positioning structure 300.

[0069] In some embodiments, the bone saw device 20 also includes a saw blade 800, one end of which is connected to the bone saw handpiece 700, and the other end of which is located within the sheath 10. Because one end of the saw blade 800 is securely mounted to the bone saw handpiece 700, and the other end is guided and constrained by the sheath 10, the entire cutting system exhibits greater stability during dynamic operation. The sheath 10 not only serves as a passive protective component but also indirectly improves the consistency of the saw blade 800's trajectory and cutting accuracy through precise positioning and cooperation with the bone saw handpiece 700.

[0070] The bone saw handpiece 700 is the core functional unit of the equipment, integrating a drive motor, transmission mechanism, and saw blade 800 assembly internally, and featuring a specially designed mating structure 710 externally. This mating structure 710 is located on the outer surface of the bone saw handpiece 700, and its geometry matches the positioning structure 300 in the sheath 10. It can take the form of a groove, a locking hole, an annular step, a guide plane, or a flexible locking mechanism. During the installation of the sheath 10, the connecting sleeve 100 is fitted onto the outside of the bone saw handpiece 700, and the positioning structure 300 is then embedded or locked into the mating structure 710 on the main unit, achieving a fixed fit between the two.

[0071] This fixed fit not only provides axial restraint but also has circumferential anti-rotation function, ensuring that the sheath 10 remains stable during the high-speed reciprocating motion of the bone saw handpiece 700 and will not rotate, slip or accidentally fall off.

[0072] In some embodiments, there are multiple mating structures 710, which are arranged circumferentially along the bone saw handpiece 700, and the positioning structure 300 can be fixedly mated with one of the mating structures 710.

[0073] The outer surface of the bone saw handpiece 700 is provided with multiple mating structures 710. These mating structures 710 are arranged uniformly or non-uniformly along the circumference of the bone saw handpiece 700, forming a multi-point positioning layout around the axis of the main unit. Each mating structure 710 has the same geometric shape and functional characteristics, and can be in the form of groove, locking hole, limiting step, elastic buckle seat or guide groove, etc., for fixed mating with the positioning structure 300 in the sheath 10.

[0074] The positioning structure 300 can selectively mate and lock with one of the mating structures 710 during the installation of the sheath 10. This design allows the sheath 10 to be installed in multiple circumferential positions according to surgical needs or operating habits, thereby adjusting the orientation of the sheath body 200 relative to the working area of ​​the saw blade 800.

[0075] The multiple mating structures 710 not only improve the flexibility of sheath 10 installation, but also enhance the redundancy and reliability of the connection. Even if one mating structure 710 wears out due to long-term use, the remaining mating structures 710 can still serve as backup options to ensure that the sheath 10 continues to have stable installation capability.

[0076] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this application. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0077] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A protective sheath for use with a bone saw handpiece, characterized in that, include: A connecting sleeve is fitted over the bone saw handpiece; A sheath body, wherein the sheath body is connected to the connecting sleeve; as well as A positioning structure is integrally formed with the sheath body or the connecting sleeve, and the positioning structure is used to fix and cooperate with the bone saw handpiece.

2. The protective sheath according to claim 1, characterized in that, The front end of the sheath body is provided with a protective cap, and the rear end of the sheath body is inserted into the connecting sleeve and integrally formed with the positioning structure, and the positioning structure is located inside the connecting sleeve.

3. The protective sheath according to claim 2, characterized in that, The connecting sleeve has a receiving space and a insertion slot. The receiving space is used for the bone saw to pass through. The insertion slot is connected to the receiving space and located on the periphery of the connecting sleeve. The insertion slot has an insertion port located at the end of the connecting sleeve. The rear end of the sheath body is inserted into the insertion slot from the insertion port so that the positioning structure is located inside the connecting sleeve.

4. The protective sheath according to claim 3, characterized in that, The sheath body and the edge of the insertion slot form a solder receiving groove, which is located outside the receiving space.

5. The protective sheath according to claim 1, characterized in that, It also includes a locking sleeve and a locking member. The connecting sleeve has a through hole along the cylinder wall. The locking member is movably disposed in the through hole. The locking sleeve is sleeved outside the connecting sleeve and can move relative to the connecting sleeve between a first position and a second position. When the locking sleeve moves to the first position, the locking sleeve presses the locking member against the outer wall of the bone saw handpiece, and the connecting sleeve locks with the bone saw handpiece. When the locking sleeve moves to the second position, the locking sleeve releases the locking member from pressing against the outer wall of the bone saw, and the connecting sleeve is unlocked from the bone saw.

6. The protective sheath according to claim 5, characterized in that, The rear end of the sheath body protrudes radially from the outer surface of the connecting sleeve. The outer surface of the connecting sleeve is provided with a limiting protrusion. The rear end of the sheath body is opposite to the limiting protrusion and arranged at intervals. The locking sleeve is provided with a stop protruding on one side of the connecting sleeve. The stop is located between the rear end of the sheath body and the limiting protrusion.

7. The protective sheath according to claim 5, characterized in that, The sheath also includes a damping element that extends circumferentially along the connecting sleeve and abuts between the locking sleeve and the connecting sleeve.

8. The protective sheath according to claim 7, characterized in that, The locking sleeve or the connecting sleeve is provided with a limiting groove, and part of the damping element is embedded in the limiting groove.

9. A bone saw device, characterized in that, include: The protective sheath as described in any one of claims 1 to 8; as well as A bone saw handpiece, wherein the bone saw handpiece is provided with a mating structure, the mating structure being fixedly engaged with the positioning structure.

10. The bone saw device according to claim 9, characterized in that, The number of the mating structures is multiple, and the multiple mating structures are arranged along the circumference of the bone saw handpiece. The positioning structure is fixedly mated with one of the mating structures.

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