CN210582625U

CN210582625U - Micro-torque handle

Info

Publication number: CN210582625U
Application number: CN201920969694.8U
Authority: CN
Inventors: 孙圳; 刘文静; 王秀平
Original assignee: Shandong Xinhua Health Industry Co ltd
Current assignee: Shandong Xinhua Health Industry Co ltd
Priority date: 2019-06-25
Filing date: 2019-06-25
Publication date: 2020-05-22
Anticipated expiration: 2029-06-25

Abstract

The utility model belongs to the technical field of medical equipment, and relates to a micro-torque handle, which comprises a tail end sleeve, wherein the tail end sleeve is in a ladder shape, a big end of the tail end sleeve is provided with a middle hole along the axis, one end of a gear shaft is arranged in the middle hole, and the periphery of the middle hole inner gear shaft is sequentially sleeved with a bearing, a first gear, a second gear meshed with the first gear, a disc spring and a jackscrew flange; the meshing surface of the first gear and the second gear is provided with a tooth shape, the first gear is fixedly connected with a gear shaft, one end of the bearing is tightly attached to the tail end of the bearing and sleeved with a shaft shoulder, and the other end of the bearing is tightly attached to the non-meshing surface of the first gear; pin holes are formed in the positions, corresponding to the outer walls of the gear II and the tail end sleeve large end, and fixing pins are inserted into the pin holes; a screwdriver shell is sleeved outside the large end of the tail end sleeve, and one end of the large end of the tail end sleeve is fixed with the screwdriver shell through threaded connection; the other end of the gear shaft is connected with the head. The utility model has the advantages of reasonable design, adopt bearing and tail end cover to cooperate, reduce the influence of radial friction to torsion.

Description

Micro-torque handle

Technical Field

The utility model relates to a little torsion handle belongs to medical instrument technical field.

Background

The small-torque handle is mainly applied to absorbable implant surgeries with low rigidity, such as absorbable bone nails and the like. In order to prevent the implant from being broken due to excessive torque and influence the success of the operation, the torque handle is required to be used for controlling the torque within the bearable range of the implant. At present, the upper torsion handle on the market is matched with the shaft sleeve in the tail end sleeve, however, when torsion occurs, radial friction force exists between the shaft sleeve and the tail end sleeve, a part of torsion is lost, and the torsion is unstable due to friction loss.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a little torque handle, this little torque handle adopt bearing and tail end cover to cooperate, reduce the influence of radial friction to torsion.

The micro-torque handle comprises a head part and a tail part, wherein the head part is matched with a clamp holder to clamp an implant, the tail part is matched with the handle to facilitate rotation, the tail part comprises a tail end sleeve, the tail end sleeve is in a step shape, a middle hole is formed in the large end of the tail end sleeve along the axis, one end of a gear shaft is installed in the middle hole, and a bearing, a first gear, a second gear meshed with the first gear, a disc spring and a jackscrew flange are sequentially sleeved on the periphery of the middle hole inner gear shaft; the meshing surface of the first gear and the second gear is provided with a tooth shape, the first gear is fixedly connected with a gear shaft, one end of the bearing is tightly attached to the tail end of the bearing and sleeved with a shaft shoulder, and the other end of the bearing is tightly attached to the non-meshing surface of the first gear; pin holes are formed in the positions, corresponding to the outer walls of the gear II and the tail end sleeve large end, and fixing pins are inserted into the pin holes; a screwdriver shell is sleeved outside the large end of the tail end sleeve, and one end of the large end of the tail end sleeve is fixed with the screwdriver shell through threaded connection; the other end of the gear shaft is connected with the head.

And a seat ring of the bearing is tightly matched with the inner wall of the middle hole, a shaft ring of the bearing is tightly matched with the gear shaft, and the butterfly spring is compressed between the jackscrew flange and the non-meshing surface of the second gear. The periphery of the big end of the tail end sleeve close to the small end is provided with external threads which are in threaded connection with the internal threads of the screw driver shell. The second gear and the tail end sleeve are connected and limited through a fixing pin, a pin hole in the outer wall of the big end of the tail end sleeve is a counter bore, and the fixing pin is a T-shaped pin. During assembly, a gear shaft provided with a first gear is placed in the large end of the tail end sleeve, then a bearing is installed, a second gear and a butterfly spring are installed, food-grade high-temperature lubricating grease is coated between the first gear and the second gear and between the butterfly springs, and finally a jackscrew flange is screwed in; the assembled components are then adjusted to a nominal torque using a torque tester and finally screwed into the driver housing. The other end of the gear shaft is provided with threads which are convenient for being in threaded connection with the head component, and the small end of the tail end sleeve is fixed with the handle. The non-meshing ends of the first gear and the second gear are not in a tooth shape, so that the first gear and the second gear can be conveniently matched and connected with other components. The bearing is used for replacing the original shaft sleeve, and the influence of radial friction force on the torsion is reduced.

Preferably, the jackscrew flange is fixed on the end part of the big head end of the tail end sleeve through threaded connection, and if necessary, the jackscrew flange and the tail end sleeve are fixed by matching with a pin.

Preferably, the tooth profiles of the first gear meshing surface and the second gear meshing surface are provided with round corners, and the round corners can reduce friction loss.

Preferably, the bearing is a plane thrust ball bearing.

Preferably, belleville spring's thickness be 0.2mm-0.3mm, through many times actual adjustment, experiment, thinner belleville spring more is favorable to the adjustment of little torsion, the utility model discloses a belleville spring, torsion is stable.

Compared with the prior art, the utility model beneficial effect who has is:

the utility model has reasonable structural design, and reduces the influence of radial friction force on torsion by matching the bearing with the tail end sleeve; the first gear and the second gear are additionally provided with fillets to reduce friction loss, the belleville springs are stable, and the phenomenon that torsion is unstable and even fails due to gear meshing and friction loss of the shaft sleeve and the tail end sleeve is avoided.

Drawings

FIG. 1 is a schematic view of a micro-torque handle;

FIG. 2 is a schematic view of the structure of the tail end sleeve;

FIG. 3 is a schematic structural view of a first gear;

fig. 4, a-a cross-sectional view.

In the figure: 1. a tail end sleeve; 2. a big head end; 3. a bearing; 4. a first gear; 5. a second gear; 6. a fixing pin; 7. a screwdriver shell; 8. a pin; 9. a jackscrew flange; 10. a belleville spring; 11. a gear shaft; 12. an external thread; 13. a pin hole; 14. a mesopore; 15. a head portion; 16. and (4) rounding.

Detailed Description

The invention will be further described with reference to the accompanying drawings:

as shown in fig. 1-4, the micro-torque handle of the present invention comprises a head portion 15 and a tail portion, wherein the head portion 15 cooperates with a holder to hold an implant, the tail portion cooperates with the handle to facilitate rotation, the tail portion comprises a tail end sleeve 1, the tail end sleeve 1 is in a step shape, a big end 2 of the tail end sleeve 1 is provided with a middle hole 14 along an axis, one end of a gear shaft 11 is installed in the middle hole 14, and the periphery of the gear shaft 11 in the middle hole 14 is sequentially sleeved with a bearing 3, a gear one 4, a gear two 5 engaged with the gear one 4, a disc spring 10 and a jackscrew flange 9; the meshing surface of the first gear 4 and the second gear 5 is provided with a tooth form, the first gear 4 is fixedly connected with the gear shaft 11, one end of the bearing 3 is tightly attached to the shaft shoulder of the tail end sleeve 1, and the other end of the bearing is tightly attached to the non-meshing surface of the first gear 4; a pin hole 13 is formed in the outer wall of the gear II 5 and the outer wall of the big head end 2 of the tail end sleeve 1, and a fixing pin 6 is inserted into the pin hole 13; a screwdriver shell 7 is sleeved outside the large end 2 of the tail end sleeve 1, and one end of the large end 2 of the tail end sleeve 1 is fixed with the screwdriver shell 7 through threaded connection; the other end of the gear shaft 11 is connected with the head 15.

In this embodiment:

the jackscrew flange 9 is fixed at the end part of the big end 2 of the tail end sleeve 1 through threaded connection, and if necessary, the jackscrew flange 9 and the tail end sleeve 1 are fixed by a pin 8; the tooth profiles of the meshing surfaces of the first gear 4 and the second gear 5 are additionally provided with fillets 16, and the fillets 16 can reduce friction loss; the bearing 3 is a plane thrust ball bearing 3; the thickness of disc spring 10 is 0.2mm-0.3mm, through many times actual adjustment, experiment, and thinner disc spring 10 more is favorable to the adjustment of little torsion, the utility model discloses a disc spring 10, torsion is stable.

The race of the bearing 3 is tightly matched with the inner wall of the middle hole 14, the shaft ring of the bearing 3 is tightly matched with the gear shaft 11, and the belleville spring 10 is compressed between the jackscrew flange 9 and the non-meshing surface of the second gear 5. The periphery of the big end 2 of the tail end sleeve 1 close to the small end is provided with an external thread 12 which is in threaded connection with the internal thread of the screw driver shell 7. The second gear 5 and the tail end sleeve 1 are connected and limited through a fixing pin 6, the fixing pin 6 only limits radial movement of the second gear 5 but not micro axial movement of the second gear 5, a pin hole 13 in the outer wall of the large end 2 of the tail end sleeve 1 is a counter bore, and the fixing pin 6 is a T-shaped pin. During assembly, a gear shaft 11 provided with a first gear 4 is placed in the big end 2 of the tail end sleeve 1, then a bearing 3 is installed, then a second gear 5 and a belleville spring 10 are installed, food-grade high-temperature lubricating grease is smeared between the first gear 4 and the second gear 5 and between the belleville springs 10, and finally a jackscrew flange 9 is screwed in; and then, adjusting the assembled components to a rated torque by using a torque tester, fixing the top thread flange 9 and the tail end sleeve 1 by matching a pin 8, and finally screwing the screw into the screwdriver shell 7. The other end of the gear shaft 11 is provided with threads, so that the gear shaft can be conveniently in threaded connection with the head 15 assembly, and the small end of the tail end sleeve 1 is fixed with the handle. The non-meshing ends of the first gear 4 and the second gear 5 are not provided with tooth shapes, so that the gear is conveniently matched and connected with other components. The bearing 3 is used for replacing the original shaft sleeve, and the influence of radial friction on the torsion is reduced. The utility model discloses redesign gear appearance structure, tolerance etc. on the basis of guaranteeing the axiality, replace the axle sleeve with plane thrust ball bearing 3 and reduce the influence of radial friction to torsion.

During use, the handle rotates to gradually implant the implant, during screwing, the torque force for screwing the implant is gradually increased, the acting force between the implant and the handle is opposite, when the rated torque force of the assembly component is achieved, the handle continues to rotate, the implant rotates oppositely, so that the implant rotates to drive the screwdriver shell 7 and the gear shaft 11 to rotate, the gear I4 on the gear shaft 11 is meshed with the gear II 5 to rotate, during the meshing rotation process of the gear I and the gear II, axial displacement can be generated due to meshing of the teeth, the force is applied to the belleville spring 10, the belleville spring 10 is deformed, the torque is generated, the effect of controlling the screwing torque force is achieved, and safe implantation of the implant is completed.

Claims

1. The utility model provides a little torque handle, includes head (15) and afterbody, and its head (15) cooperation holder centre gripping implant, afterbody cooperation handle are convenient for rotate, its characterized in that: the tail part comprises a tail end sleeve (1), the tail end sleeve (1) is in a step shape, a middle hole (14) is formed in the large end (2) of the tail end sleeve (1) along the axis, one end of a gear shaft (11) is installed in the middle hole (14), and a bearing (3), a gear I (4), a gear II (5) meshed with the gear I (4), a butterfly spring (10) and a jackscrew flange (9) are sequentially sleeved on the periphery of the gear shaft (11) in the middle hole (14); the meshing surface of the first gear (4) and the second gear (5) is provided with a tooth form, the first gear (4) is fixedly connected with a gear shaft (11), one end of the bearing (3) is tightly attached to a shaft shoulder of the tail end sleeve (1), and the other end of the bearing is tightly attached to the non-meshing surface of the first gear (4); a pin hole (13) is formed in the outer wall of the gear II (5) and the outer wall of the big head end (2) of the tail end sleeve (1) in a corresponding position, and a fixing pin (6) is inserted into the pin hole (13); a screwdriver shell (7) is sleeved outside the large end (2) of the tail end sleeve (1), and one end of the large end (2) of the tail end sleeve (1) is fixed with the screwdriver shell (7) through threaded connection; the other end of the gear shaft (11) is connected with the head part (15).

2. The micro-torque handle according to claim 1, wherein: the jackscrew flange (9) is fixed at the end part of the big end (2) of the tail end sleeve (1) through threaded connection.

3. The micro-torque handle according to claim 1, wherein: and the tooth profiles of the meshing surfaces of the first gear (4) and the second gear (5) are additionally provided with round corners (16).

4. The micro-torque handle according to claim 1, wherein: the bearing (3) is a plane thrust ball bearing.

5. The micro-torque handle according to claim 1, wherein: the thickness of the belleville spring (10) is 0.2mm-0.3 mm.