Power output mechanism

Abstract

The utility model discloses a power output mechanism, and relates to the technical field of medical instruments. In order to solve the problem that the grinding efficiency is affected due to the fact that an existing tool and a tool handle cannot be stably connected, the following technical scheme is provided: the tool comprises a shell and a screwing sleeve, and a connecting cylinder is arranged in the tool; an output shaft and an abrasive drill which are sequentially connected are arranged in the connecting cylinder, a plurality of open holes are sequentially formed in the output shaft in the axial direction, a first locking piece, a second locking piece and a third locking piece are sequentially arranged in the open holes, a push ring is arranged in the connecting cylinder, a lock sleeve is arranged in the push ring, a first spring sleeves the lock sleeve, a second spring sleeves the output shaft, and a steel ball is arranged in the connecting cylinder. And the steel ball is clamped in the push ring and the screwing sleeve. Through the refined structural design, the performance of the power output mechanism is effectively improved, reliable locking and unlocking of the abrasive drill are achieved, the stability of the whole mechanism is enhanced, the abrasive drill can still be stabilized after being used for a long time, and the grinding efficiency of an operation is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, and particularly relates to a power output mechanism. Background Art

[0002] Surgical power instruments are widely used in minimally invasive bone surgeries in departments such as otolaryngology, orthopedics, neurosurgery, and spinal surgery, providing various functions such as grinding, milling, drilling, and sawing. Surgical power instruments generally include a tool, a tool handle, and a handheld power motor. The tool is clamped at the front end of the tool handle, and the handheld power motor is clamped at the rear end of the tool handle. Its motor output shaft is docked with the power input shaft inside the tool handle to provide power for the tool.

[0003] Among them, the stable connection between the tool and the tool handle determines whether the tool can effectively grind the target bone tissue. Currently, in surgical power instruments, the tool is connected to the tool handle through a collet. For example, the Chinese Utility Model Patent CN218792393U provides a power output mechanism and a grinding drill handle. The power output mechanism includes a connecting cylinder, a locking sleeve, and an output assembly. The locking sleeve is rotatably sleeved on the connecting cylinder, and the output assembly is arranged inside the connecting cylinder, including an output shaft, a collet, a driving component, a return spring, and a ball. The collet is slidably inserted into the clamping hole for clamping the tool. The front end of the collet includes three split petals, each split petal can undergo a certain degree of elastic deformation, and a shrinkage notch is arranged between adjacent split petals. The shrinkage notch is arranged along the axial direction of the collet. Generally speaking, the tool is for single use, while the tool handle can be reused. After the elastic collet is inserted and pulled out multiple times, it may deform, resulting in an unstable connection between the tool and the tool handle and affecting the grinding efficiency. Therefore, the connection method between the tool and the tool handle needs to be improved. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a power output mechanism to solve the problem that the existing tool and tool handle cannot be stably connected, affecting the grinding efficiency.

[0005] The technical solution of the utility model to solve the above technical problems is as follows:

[0006] A power output mechanism, which includes: a housing and a screwing sleeve coaxially arranged with the housing and movably connected to the housing. A connecting cylinder is arranged inside the housing and the screwing sleeve.

[0007] Inside the connecting cylinder, there is an output shaft and a grinding drill connected in sequence. The output shaft is provided with a plurality of openings along the axial direction. Inside the plurality of openings of the output shaft, there are a first locking member, a second locking member, and a third locking member in sequence. Inside the connecting cylinder, there is a movable push ring. Outside the plurality of openings located inside the push ring and outside the output shaft, there is a locking sleeve. A first spring is sleeved on the locking sleeve, and a second spring is sleeved on the output shaft. There are steel balls in the spiral groove of the connecting cylinder. The steel balls are respectively clamped in the push ring groove opened in the circumferential direction of the push ring and the linear groove opened on the screwing sleeve at the same time.

[0008] Further, the spiral groove includes a front card slot and a rear card slot. The front card slot deviates towards the rear end of the connecting cylinder with respect to the trajectory of the spiral groove, and the rear card slot deviates towards the front end of the connecting cylinder with respect to the trajectory of the spiral groove.

[0009] Further, the end of the grinding drill is a flat part, and a circle of grinding drill grooves is opened along the circumferential direction at the adjacent position of its end. After the grinding drill is locked, the first locking member abuts against the flat part, and the second locking member is pressed into the grinding drill groove by the locking sleeve.

[0010] Further, in the bending power instrument, the end of the output shaft is connected to the power transmission shaft through a gear, and in the straight cylinder power instrument, the end of the output shaft is directly connected to the power transmission shaft.

[0011] Further, the locking sleeve is integrally in the shape of a hollow cylinder. The inner side of its front end is wedge-shaped towards the position of the front end opening, and an annular baffle protruding radially outwards is provided at its rear end. Blind holes are provided on the inner circumferential surface of the locking sleeve.

[0012] Further, a first bearing is sleeved on the end of the output shaft, a second bearing is sleeved on the middle part of the grinding drill, and a third bearing is sleeved on the front end of the grinding drill.

[0013] Further, inside the housing and at the front end of the connecting cylinder, there is a bearing stabilizing member, and the bearing stabilizing member abuts against the front end of the connecting cylinder and the rear end of the third bearing respectively.

[0014] Further, the first locking member and the second locking member are steel balls, and the third locking member is a cylinder.

[0015] The utility model has the following beneficial effects:

[0016] By setting a multi-stage locking mechanism (the first, second, and third locking members) on the output shaft, and using springs (the first spring and the second spring) and the design of steel balls cooperating with the spiral groove, the utility model not only realizes the reliable locking and unlocking of the grinding drill, but also enhances the stability of the whole mechanism during the working process. Since the locking device does not adopt an elastic bushing, the grinding drill can still be firmly fixed after long-term use, ensuring the grinding efficiency of the operation. Description of the Drawings

[0017] Figure 1It is a cross-sectional view of the power output mechanism in the locked state;

[0018] Figure 2 It is a cross-sectional view of the power output mechanism in the unlocked state;

[0019] Figure 3 It is a structural diagram of a grinding drill;

[0020] Figure 4 It is a structural diagram of a connecting cylinder;

[0021] Figure 5 It is a structural diagram of a lock sleeve.

[0022] Figures 1 to 5 The reference numerals shown in the figure are respectively represented as: 1 - outer shell; 2 - screwing sleeve; 3 - connecting cylinder; 31 - output shaft; 311 - first bearing; 312 - second bearing; 313 - third bearing; 32 - spiral groove; 321 - front card slot; 322 - rear card slot; 41 - second spring; 42 - first spring; 5 - lock sleeve; 51 - annular baffle; 52 - blind hole; 61 - first locking member; 62 - second locking member; 63 - third locking member; 7 - bearing stabilizer; 8 - grinding drill; 81 - flat part; 82 - grinding drill groove; 9 - push ring; 91 - push ring groove; 10 - steel ball. Specific embodiments

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts fall within the protection scope of the present invention.

[0024] The present invention provides a power output mechanism, which includes: an outer shell 1 and a screwing sleeve 2 coaxially arranged with the outer shell 1 and movably connected to the outer shell 1. A connecting cylinder 3 is provided inside the outer shell 1 and the screwing sleeve 2.

[0025] Refer to Figure 1 , inside the connecting cylinder 3, there are an output shaft 31 and a grinding drill 8 connected in sequence. The output shaft 31 is provided with a plurality of openings along the axial direction. Inside the plurality of openings of the output shaft 31, there are a first locking member 61, a second locking member 62 and a third locking member 63 in sequence. The first locking member 61 and the second locking member 62 are steel balls, and the third locking member 63 is a cylinder. A movable push ring 9 is provided inside the connecting cylinder 3. A circular push ring groove 91 is arranged along the circumferential direction on the push ring 9. The push ring groove 91 is arc-shaped. A lock sleeve 5 is provided at the plurality of openings located inside the push ring 9 and sleeved outside the output shaft 31. The lock sleeve 5 is integrally in the shape of a hollow cylinder (as Figure 5As shown, the inner side of its front end is wedge-shaped towards the position of the front-end opening, and an annular baffle 51 protruding radially outwards is provided at its rear end. Blind holes 52 are provided on the inner circumferential surface of the lock sleeve 5.

[0026] Referring to Figures 1-2 , the first spring 42 is sleeved on the outer surface of the lock sleeve 5, with one end abutted against the front side of the push ring 9 and the other end abutted against the step inside the connecting cylinder 3. The second spring 41 is sleeved on the output shaft 31, with one end abutted against the annular baffle 51 of the lock sleeve 5 and the other end abutted against the outer shell of the first bearing 311. A spiral groove 32 with clamping grooves at both ends is provided on the connecting cylinder 3. Among them, the front clamping groove 321 faces the rear end of the connecting cylinder 3, and the rear clamping groove 322 faces the front end of the connecting cylinder 3. Here, the end closer to the doctor during the operation is defined as the rear end of the connecting cylinder 3, and the farther end is defined as the front end of the connecting cylinder 3. The steel ball 10 is arranged in the spiral groove 32 and is clamped into the push ring groove 91 of the push ring 9. The inner surface of the screwing sleeve 2 is provided with an axial linear groove, and the steel ball 10 is also clamped into this linear groove at the same time.

[0027] In the bending power instrument, the end of the output shaft 31 is connected to the power transmission shaft through a gear. In the straight tube power instrument, the end of the output shaft 31 is directly connected to the power transmission shaft.

[0028] Please refer to Figure 3 , in cooperation with this improved power output mechanism, the structure of the drill 8 is also improved. Specifically, the end of the drill 8 is flat, and a circle of drill grooves 82 is arranged circumferentially not far from the end. After inserting the drill 8 and locking the drill, the first locking member 61 abuts against the flat part 81, and the second locking member 62 is pressed by the lock sleeve into the circumferential drill grooves 82 of the drill 8.

[0029] Referring to Figure 4 , the spiral groove 32 includes a front clamping groove 321 and a rear clamping groove 322. After the drill 8 is locked, the steel ball 10 moves into the front clamping groove 321 of the spiral groove 32. After the drill 8 is unlocked, the steel ball 10 moves into the rear clamping groove 322 of the spiral groove 32.

[0030] Referring to Figure 1 , a first bearing 311 is sleeved on the end of the output shaft 31, a second bearing 312 is sleeved in the middle of the drill 8, and a third bearing 313 is sleeved on the front end of the drill 8. A bearing stabilizer 7 is provided inside the housing 1 and at the front end of the connecting cylinder 3. The bearing stabilizer 7 can be a cylindrical sleeve sleeved on the front end of the drill 8, and the bearing stabilizer 7 abuts against the front end of the connecting cylinder 3 and the rear end of the third bearing 313 respectively.

[0031] The working principle of this embodiment is as follows:

[0032] 1. When unlocking (referring to Figure 2), Rotate the screwing sleeve 2, the steel ball 10 drives the pushing ring 9 to move towards the rear end of the power transmission mechanism. The pushing ring 9 moves towards the locking sleeve 5 until it abuts against the annular baffle 51. The pushing ring 9 continues to move, pushing the locking sleeve 5 backward until the blind hole 52 of the locking sleeve 5 moves above the second locking member 62. At this time, the second locking member 62 cannot fully abut against the inner wall of the locking sleeve 5, and the third locking member 63 is located below the wedge-shaped portion at the front end of the locking sleeve 5 and also cannot fully abut against the inner wall of the locking sleeve 5, realizing the unlocking of the grinding drill 8. At this time, the steel ball 10 moves into the rear card slot 322 of the spiral groove 32. The second spring 41 is in a compressed state and has a tendency to move forward, pressing the steel ball 10 against the rear card slot 322. The first spring 42 is also in a compressed state and has a tendency to move backward, keeping the blind hole 52 of the locking sleeve 5 always above the second locking member 62, thus maintaining the unlocked state.

[0033] 2. When locking (refer to Figure 1 ), Insert the grinding drill 8 into the connecting cylinder 3 and rotate the screwing sleeve 2 in the reverse direction. The steel ball 10 drives the pushing ring 9 to move towards the front end of the power transmission mechanism until the pushing ring 9 separates from the annular baffle 51 of the locking sleeve 5. The pushing ring 9 continues to move forward, compressing the first spring 42. At the same time, the second spring 41 pushes the locking sleeve 5 forward. The second locking member 62 and the third locking member 63 fully abut against the inner wall of the locking sleeve 5, thus locking the grinding drill 8. At this time, the steel ball 10 moves into the front card slot 321 of the spiral groove 32. The first spring 42 is in a compressed state and has a tendency to move backward, which can press the steel ball 10 in the front card slot 321. The second spring 41 is also in a compressed state and has a tendency to move forward, continuously pushing against the locking sleeve 5, so that the second locking member 62 and the third locking member 63 always fully abut against the locking sleeve 5, maintaining the locking state of the locking sleeve 5.

[0034] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A power output mechanism, characterized in that: include: A housing (1) and a screw sleeve (2) coaxially arranged with the housing (1) and movably connected to the housing (1); a connecting tube (3) is provided inside the housing (1) and the screw sleeve (2); The connecting tube (3) is provided with an output shaft (31) and a grinding drill (8) connected in sequence. The output shaft (31) is provided with a plurality of openings in sequence along the axial direction. A first locking member (61), a second locking member (62) and a third locking member (63) are provided in sequence in the plurality of openings of the output shaft (31). A movable push ring (9) is provided in the connecting tube (3). A locking sleeve (5) is provided inside the push ring (9) and outside the plurality of openings of the output shaft (31). A first spring (42) is sleeved on the locking sleeve (5). A second spring (41) is sleeved on the output shaft (31). A steel ball (10) is provided in the spiral groove (32) of the connecting tube (3). The steel ball (10) is respectively clamped in a push ring groove (91) provided in the circumferential direction of the push ring (9) and in a linear groove provided on the screw sleeve (2).

2. The power output mechanism according to claim 1, characterized in that: The spiral groove (32) comprises a front groove (321) and a rear groove (322); the front groove (321) is biased towards the rear end of the connecting tube (3) relative to the trajectory of the spiral groove (32); and the rear groove (322) is biased towards the front end of the connecting tube (3) relative to the trajectory of the spiral groove (32).

3. The power output mechanism according to claim 1, characterized in that: The end of the burr (8) is a flat portion (81), and a circle of burr grooves (82) are provided adjacent to the end along the circumferential direction. After the burr (8) is locked, the first locking piece (61) abuts against the flat portion (81), and the second locking piece (62) is pressed into the burr groove (82) by the locking sleeve (5).

4. The power output mechanism according to claim 1, characterized in that: In the bending power apparatus, the end of the output shaft (31) is connected to the power transmission shaft via a gear, and in the straight power apparatus, the end of the output shaft (31) is directly connected to the power transmission shaft.

5. The power output mechanism according to claim 1, characterized in that: The locking sleeve (5) is in the shape of a hollow cylinder as a whole, the inner side of its front end is wedge-shaped towards the front end opening, and the rear end is provided with an annular baffle (51) protruding radially outward, and the inner circumferential surface of the locking sleeve (5) is provided with a blind hole (52).

6. The power output mechanism according to claim 1, characterized in that: The end of the output shaft (31) is sleeved with a first bearing (311), the middle of the drill (8) is sleeved with a second bearing (312), and the front end of the drill (8) is sleeved with a third bearing (313).

7. The power output mechanism according to claim 6, characterized in that: A bearing stabilizing member (7) is provided in the housing (1) and at the front end of the connecting tube (3); the bearing stabilizing member (7) abuts against the front end of the connecting tube (3) and the rear end of the third bearing (313) respectively.

8. The power output mechanism according to claim 1, characterized in that: The first locking member (61) and the second locking member (62) are steel balls, and the third locking member (63) is a cylinder.

Images