Quick release mechanism of working tip and ultrasonic osteotome with same

Abstract

The utility model discloses a kind of quick-release mechanism of working tip and the ultrasonic bone cutter with it, including fixed sleeve, one end of the fixed sleeve is used to connect on instrument equipment, and the fixed sleeve contains the connecting groove for the rod handle of working tip insertion;Locking ball, the wall body of the fixed sleeve is opened and passed through with locking hole corresponding to the connecting groove, the locking ball is movably arranged relative to the locking hole, the locking ball is displaced towards the inner side or the outer side of the connecting groove to make the rod handle be clamped or loosened;Locking sleeve, the locking sleeve is sleeved on the outer side of the fixed sleeve, the locking sleeve is adjusted in position along axial direction relative to the fixed sleeve to drive the locking ball towards the inner side or the outer side of the connecting groove displacement, simple structure, and working tip can be quickly disassembled, improve work efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of medical devices, and specifically relates to a quick-release mechanism for a working tip and an ultrasonic bone scalpel having the same. Background Technology

[0002] Ultrasonic bone scalpels are widely used due to their precision and minimally invasive nature. The working tip is the part of the ultrasonic bone scalpel that directly acts on bone tissue and needs to be frequently replaced according to surgical needs. Traditional working tip connection methods mostly use threaded connections or simple clamping structures, which have drawbacks such as cumbersome replacement operations, long time consumption, reduced surgical efficiency, and complex structures. Therefore, there is an urgent need for a quick-release mechanism for the working tip that can achieve rapid assembly and disassembly while also having a simple structure. Utility Model Content

[0003] To address the aforementioned issues, this invention provides a quick-release mechanism for the working tip and an ultrasonic bone scalpel incorporating the mechanism. The mechanism is simple in structure and enables quick assembly and disassembly of the working tip, thereby improving work efficiency.

[0004] The technical solution of this utility model is as follows:

[0005] A quick-release mechanism for a working tip, comprising:

[0006] A retaining sleeve, one end of which is used to connect to an instrument, and the retaining sleeve includes a connecting groove for inserting a shank of a working tip;

[0007] The locking ball has a locking hole on the wall of the fixed sleeve corresponding to the connecting groove. The locking ball is movably disposed relative to the locking hole. The locking ball is displaced toward the inside or outside of the connecting groove to clamp or release the rod handle.

[0008] A locking sleeve is fitted onto the outside of the fixed sleeve. The locking sleeve is axially adjusted relative to the fixed sleeve to drive the locking ball to move toward the inside or outside of the connecting groove.

[0009] In some embodiments, the inner wall of the locking sleeve includes an inner protrusion and an outer concave portion arranged adjacent to each other in the axial direction. In the radial direction of the fixing sleeve, the distance from the inner protrusion to the fixing sleeve is smaller than the distance from the outer concave portion to the fixing sleeve. The inner protrusion abuts against the locking ball in a locked state, and the inner protrusion not contacting the locking ball in an unlocked state.

[0010] In some embodiments, the locking sleeve is elastically extended and slung over the outside of the fixed sleeve by an elastic member. In the free state of the elastic member, the inner protrusion pushes the locking ball into the locking hole. In the compressed state of the elastic member, the locking ball partially or completely disengages from the locking hole.

[0011] In some embodiments, the outer recess is located on the side near the working tip, and a retaining ring is provided on the outer edge of the insertion end of the connecting groove, and the retaining ring extends toward the outer recess; in the unlocked state, the locking ball is located in the area enclosed by the retaining ring, the outer recess, and the fixing sleeve.

[0012] In some embodiments, the axial length of the concave portion in the direction of elastic displacement is not less than the compression stroke of the elastic element.

[0013] In some embodiments, the distance between the outer recess and the fixing sleeve is less than the diameter of the locking ball, and the diameter of the locking hole is less than the diameter of the locking ball.

[0014] In some embodiments, a mounting cavity is further included between the fixing sleeve and the locking sleeve, and the elastic element is correspondingly disposed in the mounting cavity, with the elastic ends of the elastic element respectively connected to the fixing sleeve and the locking sleeve.

[0015] In some embodiments, a connecting rod is provided at the end of the fixing sleeve opposite to the insertion end, and the locking sleeve is sleeved on the outside of the connecting rod and is guided by displacement through the connecting rod.

[0016] In some embodiments, the connecting groove includes an insertion section and a limiting section in the insertion direction. The insertion section is a cylindrical section, and the limiting section is a groove section. The limiting section is adapted to the shape of the top end of the handle to restrict the circumferential rotation of the handle.

[0017] In a second aspect, an ultrasonic bone scalpel is provided, having a quick-release mechanism as described in any one of the first aspects.

[0018] Beneficial effects: Compared with existing threaded connections, this invention significantly improves loading and unloading speed. The locking ball displaces towards the inside or outside of the connecting groove to clamp or release the handle. The locking ball and handle lock in a point-contact manner, resulting in concentrated contact stress and reliable locking. The entire mechanism has fewer parts, a compact structure, and is easy to process and assemble, reducing manufacturing costs. Attached Figure Description

[0019] Figure 1 This is a three-dimensional schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is an enlarged schematic diagram of the structure of part A in the locked state of this utility model;

[0021] Figure 3 This is an enlarged structural diagram of part A in the unlocked state of this utility model;

[0022] Figure 4This is an exploded view of the overall structure of this utility model.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1-Fixing sleeve; 2-Rod handle; 3-Connecting groove; 4-Locking ball; 5-Locking hole; 6-Locking sleeve; 7-Inner protrusion; 8-Outer concave part; 9-Elastic element; 10-Retaining ring; 11-Mounting cavity; 12-Limiting section; 13-Insertion end; 15-Connecting rod; 20-Locking groove; 21-Limiting flat part. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Ultrasonic bone scalpels are widely used due to their precision and minimally invasive nature. The working tip is the part of the ultrasonic bone scalpel that directly acts on bone tissue and needs to be frequently replaced according to surgical needs. Traditional working tip connection methods mostly use threaded connections or simple clamping structures, which have drawbacks such as cumbersome replacement operations, long time consumption, reduced surgical efficiency, and complex structures. Therefore, there is an urgent need for a quick-release mechanism for the working tip that can achieve rapid assembly and disassembly while also having a simple structure.

[0027] Firstly, such as Figures 1 to 4 As shown, a quick-release mechanism for a working tip is provided, comprising:

[0028] A fixing sleeve 1, one end of which is used to connect to an instrument, and the fixing sleeve 1 includes a connecting groove 3 for inserting a rod handle 2 of a working tip;

[0029] The locking ball 4 has a locking hole 5 through the wall of the fixed sleeve 1 corresponding to the connecting groove 3. The locking ball 4 is movably disposed relative to the locking hole 5. The locking ball 4 is displaced toward the inside or outside of the connecting groove 3 to clamp or release the rod handle 2.

[0030] Locking sleeve 6 is sleeved on the outside of the fixed sleeve 1. The locking sleeve 6 is axially adjusted relative to the fixed sleeve 1 to drive the locking ball 4 to move toward the inside or outside of the connecting groove 3.

[0031] The axial movement of the locking sleeve 6 is converted into the radial movement of the locking ball 4, ultimately achieving the clamping and release of the handle 2. Specifically, when locking is required, the locking sleeve 6 is driven (either manually or by elastic force) to a specific axial position. At this time, its internal structure (such as a ramp or boss) applies a radially inward pressure to the locking ball 4, forcing part of the ball 4 to pass through the locking hole 5 and enter the connecting groove 3, while part of the ball protrudes into the connecting groove 3 and embeds into the pre-set annular groove (such as the locking groove 20) or locking area on the working tip handle 2. This form of "point contact" or "partial surface contact" forms a mechanical interlock. Conversely, when disassembly is required, the locking sleeve 6 is driven to another axial position, and its internal structure provides space for the locking ball 4 to move radially outward. At this time, the force of directly pulling out the working tip forces the locking ball 4 to be pushed out of the handle groove, or the locking ball 4 naturally falls back under no-load conditions, thereby releasing the constraint on the handle 2, and the working tip can be freely removed.

[0032] The engagement of the locking ball 4 and the groove of the handle 2 forms an over-positioning mechanical lock, whose anti-loosening capability is far superior to friction locking. Especially when subjected to the high-frequency, micro-amplitude vibrations generated by the ultrasonic bone scalpel, this rigid interlocking structure effectively prevents the working tip from spontaneously loosening due to vibration, ensuring the safety of the surgery and the stability of energy transmission. Moreover, its simplified structure and high reliability, with the entire mechanism consisting of only three core components, mean a lower failure rate and a simpler assembly process.

[0033] In some embodiments, the inner wall of the locking sleeve 6 includes an inner protrusion 7 and an outer concave portion 8 arranged adjacent to each other in the axial direction. In the radial direction of the fixing sleeve 1, the distance between the inner protrusion 7 and the fixing sleeve 1 is smaller than the distance between the outer concave portion 8 and the fixing sleeve 1. The locking sleeve 6 is positioned relative to the fixing sleeve 1 in the axial direction. The inner protrusion 7 is in a locked state when it abuts against the locking ball 4, and in an unlocked state when it is not in contact with the locking ball 4.

[0034] In the locked state, the locking sleeve 6 moves until the inner protrusion 7 is directly opposite the locking ball 4. Since the gap between the inner protrusion 7 and the outer wall of the fixing sleeve 1 is smaller than the diameter of the locking ball 4, the inner surface of the inner protrusion 7 acts as a pressure block, forcibly squeezing the locking ball 4 towards the center, preventing it from remaining in its original position and forcing it to move inwards towards the connecting groove 3, thus completing the locking. In the unlocked state, the locking sleeve 6 moves axially until the outer concave portion 8 is aligned with the locking ball 4. The annular space formed by the outer concave portion 8 and the outer wall of the fixing sleeve 1 has a radial dimension larger than the diameter of the locking ball 4, thus providing a release area for the locking ball 4. After losing radial pressure, the locking ball 4 can move into this area under external force or its own weight, releasing the constraint on the handle 2. The inner protrusion 7 and the outer concave portion 8 constitute two positional states, clearly distinguishing between the locked and unlocked states.

[0035] Understandably, to facilitate the pushing of the locking ball 4 by the inner convex part 7 and prevent jamming, the inner convex part 7 and the outer concave part 8 are curved to reduce the step height difference. The inner convex part is a ring-shaped protrusion structure, and the interface shape can be rectangular, boss, arc, etc., without specific restrictions, as long as it can achieve radial displacement of the locking ball 4.

[0036] In some embodiments, the locking sleeve 6 is elastically extended and sleeved on the outside of the fixed sleeve 1 by an elastic member 9. The elastic member 9 is preferably a spring. In the free state of the elastic member 9, the inner protrusion 7 pushes the locking ball 4 into the locking hole 5. In the compressed state of the elastic member 9, the locking ball 4 partially or completely disengages from the locking hole 5.

[0037] In its natural state, without human intervention, the elastic element 9 is in an extended state. Its released elastic force pushes the locking sleeve 6 forward, typically towards the working tip insertion end, causing the inner protrusion 7 on the locking sleeve 6 to continuously press against the locking ball 4. This is a normally closed design. When unlocking is required, the operator must overcome the elastic force of the elastic element 9 and pull the locking sleeve 6 backward, compressing the elastic element 9 to store potential energy. Once the hand is released, the potential energy stored in the elastic element 9 is immediately released, driving the locking sleeve 6 to automatically reset, and the inner protrusion 7 presses against the locking ball 4 again, completing the automatic locking. This means that "locking" is the default and normal state of the mechanism, while "unlocking" requires the active application of external force.

[0038] In some embodiments, the outer recess 8 is located on the side near the working tip, and a retaining ring 10 is provided on the outer edge of the insertion end 13 of the connecting groove 3, and the retaining ring 10 extends toward the outer recess 8; in the unlocked state, the locking ball 4 is located in the area enclosed by the retaining ring 10, the outer recess 8 and the fixing sleeve 1.

[0039] When the locking sleeve 6 is pulled to the unlocked position and the outer recess 8 is aligned with the locking ball 4, the locking ball 4 gains free space to move in the radial direction. Without the retaining ring 10, the locking ball 4 might roll completely out of the locking hole 5 under gravity, resulting in its loss. The retaining ring 10, as an annular flange extending from the end of the fixed sleeve 1, has an inner diameter smaller than the size through which the locking ball 4 cannot pass, forming a physical barrier. It restricts the range of motion of the locking ball 4 within the capture cavity, allowing the locking ball 4 to fully disengage from the lever 2 during unlocking without separating from the mechanism body.

[0040] In some embodiments, the axial length of the outer recess 8 in the direction of elastic displacement is not less than the compression stroke of the elastic element 9. This ensures that the locking ball 4) obtains sufficient and consistent release space throughout the unlocking process and remains inside the locking sleeve 6, without dislodging from the mechanism body.

[0041] In some embodiments, the distance between the outer recess 8 and the fixing sleeve 1 is less than the diameter of the locking ball 4. Even in the unlocked state, the locking ball 4 cannot fall completely into the annular gap formed by the outer recess 8 and the outer wall of the fixing sleeve 1. A part of its ball will inevitably remain in the locking hole 5. This prevents the locking ball 4 from moving too radially during unlocking, causing its center of gravity to completely deviate from the locking hole 5 and making it difficult to return to its original position.

[0042] The diameter of the locking hole 5 is smaller than the diameter of the locking ball 4. Even in the unlocked state, the locking ball 4 can only fall between the fixed sleeve and the locking sleeve, and will not come out of the connecting groove 3 through the locking hole.

[0043] In some embodiments, a mounting cavity 11 is further included between the fixing sleeve 1 and the locking sleeve 6, and the elastic member 9 is correspondingly disposed within the mounting cavity 11, with its elastic ends connected to the fixing sleeve 1 and the locking sleeve 6, respectively. More specifically, the elastic ends of the elastic member 9 are connected to the wall of the fixing sleeve 1 and the inner protrusion 7 of the locking sleeve 6, respectively. Concealing the elastic member 9 allows for a regular appearance and facilitates operation.

[0044] In some embodiments, the fixed sleeve 1 is further provided with a connecting rod 15 at one end opposite to the insertion end 13. One end of the connecting rod 15 is used to connect to the fixed sleeve, and the other end is connected to the amplitude rod of the bone cutter. Alternatively, the connecting rod 15 itself is part of the amplitude rod. The locking sleeve 6 is sleeved on the outside of the connecting rod 15 and is guided by displacement through the connecting rod 15.

[0045] When a pulling or pushing force is applied to the locking sleeve 6, the cylindrical surface of the connecting rod 15 forms a sliding pair with the inner surface of the locking sleeve 6, which strictly restricts the movement of the locking sleeve 6 to a straight axial line, completely eliminating the possibility of circumferential rotation or radial oscillation.

[0046] like Figures 2 to 4 As shown, in some embodiments, the connecting groove 3 includes an insertion section and a limiting section 12 in the insertion direction. The insertion section is a cylindrical section, and the limiting section 12 is a groove section. The limiting section 12 is adapted to the shape of the top end of the handle 2 to restrict the circumferential rotation of the handle 2. It can be understood that the shape of the connecting groove 3 should be adapted to the shape of the handle 2 to ensure that it can be inserted and reduce radial clearance. Moreover, in order to prevent the working tip from rotating circumferentially during operation, a limiting flat part 21 is provided on the handle of the working tip, and a limiting section 12 matching the shape of the limiting flat part 21 is also provided at the bottom of the connecting groove 3, thereby restricting the circumferential rotation of the working tip and making its operation more stable.

[0047] Secondly, an ultrasonic bone scalpel is provided, having a quick-release mechanism as described in any one of the first aspects. It possesses all the technical effects of the quick-release mechanism in the first aspect.

[0048] A specific embodiment of a quick-release mechanism for the working tip is provided, as follows:

[0049] like Figures 1 to 4 The main components shown include a fixed sleeve 1, a locking ball 4, and a locking sleeve 6.

[0050] The fixed sleeve 1 is the basic component of the mechanism. One end of it is connected to the main unit (not shown) of the ultrasonic bone scalpel via a connecting rod 15 to transmit ultrasonic vibrations. A cylindrical connecting groove 3 is formed inside the fixed sleeve 1 for inserting the handle 2 of the working tip. The connecting groove 3 is divided into two sections: the insertion section near the insertion end 13 is a smooth cylindrical section, facilitating the guidance and centering of the handle 2; the internal limiting section 12 is a groove (e.g., a rectangular groove) that matches the shape of the top end of the handle 2, preventing the working tip from rotating circumferentially relative to the fixed sleeve 1 under high-speed vibration, ensuring energy transfer efficiency.

[0051] The side wall of the fixed sleeve 1 has a locking hole 5, in which the locking ball 4 is placed. The diameter of the locking hole 5 is slightly smaller than the diameter of the locking ball 4, so that the locking ball 4 will not fall completely into the connecting groove 3 or completely fall out of the fixed sleeve 1, but can move radially within the hole.

[0052] The locking sleeve 6 is elastically fitted onto the outside of the fixing sleeve 1 by an elastic element 9 (such as a compression spring). The inner wall of the locking sleeve 6 is machined with continuous inner protrusions 7 and outer concave portions 8. In its natural state (i.e., locked state, such as...) Figure 2 Under the influence of the elastic element 9, the elastic force pushes the locking sleeve 6, causing its inner protrusion 7 to press against the locking ball 4, forcing the locking ball 4 to protrude into the connecting groove 3, thereby locking the corresponding annular groove (not marked) on the handle 2, and achieving reliable locking of the working tip.

[0053] When the working tip needs to be replaced, the operator pulls the locking sleeve 6 backward (i.e., away from the insertion end 13) to compress the elastic element 9. When the locking sleeve 6 moves until its outer recess 8 is aligned with the locking ball 4 (as shown in the image), the operator pulls the locking sleeve 6 backward (i.e., away from the insertion end 13) to compress the elastic element 9. Figure 3 With the locking ball 4 no longer radially constrained by the inner protrusion 7, the space between the outer recess 8 and the outer wall of the fixing sleeve 1 increases. The locking ball 4 can then move radially outward within this space, thus exiting the groove of the handle 2, releasing the locking of the handle 2, and allowing the working tip to be removed. The design of the retaining ring 10 prevents the locking ball 4 from excessively shifting outward and falling off in the unlocked state, and together with the outer recess 8, forms a release space to accommodate the locking ball 4.

[0054] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for mutual communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. In the description of this application, "multiple" means two or more, unless otherwise expressly and specifically limited. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features.

[0055] The above steps are provided only to help understand the method, structure, and core ideas of this application. Those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims.

Claims

1. A quick-release mechanism for a working tip, characterized in that, include: A fixing sleeve (1), one end of which is used to connect to an instrument, and the fixing sleeve (1) includes a connecting groove (3) for inserting a rod handle (2) of a working tip. Locking ball (4), the wall of the fixing sleeve (1) is provided with a locking hole (5) corresponding to the connecting groove (3), the locking ball (4) is movably arranged relative to the locking hole (5), the locking ball (4) is displaced toward the inner or outer side of the connecting groove (3) so as to clamp or release the rod handle (2). Locking sleeve (6) is fitted on the outside of the fixed sleeve (1). The locking sleeve (6) is axially adjusted relative to the fixed sleeve (1) to drive the locking ball (4) to move toward the inside or outside of the connecting groove (3).

2. The quick-release mechanism for a working tip according to claim 1, characterized in that, The inner wall of the locking sleeve (6) includes an inner protrusion (7) and an outer concave portion (8) arranged adjacent to each other in the axial direction. In the radial direction of the fixing sleeve (1), the distance between the inner protrusion (7) and the fixing sleeve (1) is smaller than the distance between the outer concave portion (8) and the fixing sleeve (1). The inner protrusion (7) is in a locked state when it abuts against the locking ball (4), and the inner protrusion (7) is in an unlocked state when it does not contact the locking ball (4).

3. The quick-release mechanism for a working tip according to claim 2, characterized in that, The locking sleeve (6) is elastically extended and flexibly sleeved on the outside of the fixed sleeve (1) by the elastic member (9). In the free state of the elastic member (9), the inner protrusion (7) pushes the locking ball (4) into the locking hole (5). In the compressed state of the elastic member (9), the locking ball (4) partially or completely disengages from the locking hole (5).

4. The quick-release mechanism for a working tip according to claim 3, characterized in that, The outer recess (8) is located on the side near the working tip, and a retaining ring (10) is provided on the outer edge of the insertion end (13) of the connecting groove (3), and the retaining ring (10) extends toward the outer recess (8); in the unlocked state, the locking ball (4) is located in the area enclosed by the retaining ring (10), the outer recess (8) and the fixing sleeve (1).

5. The quick-release mechanism for a working tip according to claim 3, characterized in that, In the direction of elastic displacement, the axial length of the outer recess (8) is not less than the compression stroke of the elastic element (9).

6. The quick-release mechanism for a working tip according to claim 3, characterized in that, The distance between the outer recess (8) and the fixing sleeve (1) is less than the diameter of the locking ball (4), and the diameter of the locking hole (5) is less than the diameter of the locking ball (4).

7. The quick-release mechanism for a working tip according to claim 3, characterized in that, The fixed sleeve (1) and the locking sleeve (6) also include an installation cavity (11), and the elastic element (9) is correspondingly disposed in the installation cavity (11), and the elastic ends of the elastic element (9) are respectively connected to the fixed sleeve (1) and the locking sleeve (6).

8. The quick-release mechanism for a working tip according to claim 1, characterized in that, The fixed sleeve (1) is provided with a connecting rod (15) at one end opposite to the insertion end (13). The locking sleeve (6) is sleeved on the outside of the connecting rod (15) and is guided by displacement through the connecting rod (15).

9. The quick-release mechanism for a working tip according to claim 1, characterized in that, The connecting groove (3) includes an insertion section and a limiting section (12) in the insertion direction. The insertion section is a cylindrical section, and the limiting section (12) is a groove section. The limiting section (12) is adapted to the top shape of the rod handle (2) to limit the circumferential rotation of the rod handle (2).

10. An ultrasonic bone scalpel, characterized in that, It has a quick-release mechanism as described in any one of claims 1 to 9.

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