CN216570349U

CN216570349U - Femoral stem capable of adjusting stem length

Info

Publication number: CN216570349U
Application number: CN202122891548.8U
Authority: CN
Inventors: 代继东
Original assignee: Tianjin Jiuzhoutong Medical Equipment Co ltd
Current assignee: Tianjin Jiuzhoutong Medical Equipment Co ltd
Priority date: 2021-11-23
Filing date: 2021-11-23
Publication date: 2022-05-24
Anticipated expiration: 2031-11-23

Abstract

The utility model relates to the technical field of femoral stems, in particular to a femoral stem capable of adjusting the length of the stem, which improves the adaptability of users, increases the functional diversity of a device and reduces the use limitation; including handle footpath portion, adjust the pole, the handle pole, the spur rack, a bearing, the hollow shaft, drive gear, adjustment mechanism and stop gear, handle footpath portion bottom is provided with the inner chamber, adjust the pole top and handle footpath portion inner chamber cooperation sliding connection, the pole cooperation is installed in adjusting the pole bottom, the spur rack cooperation is installed in adjusting pole groove intracavity portion, the bearing cooperation is installed in handle footpath portion inner chamber front and back both ends shaft hole, the hollow shaft rotates with the bearing cooperation to be connected, drive gear is connected with the coaxial cooperation of hollow shaft, drive gear is connected with spur rack meshing transmission, adjustment mechanism is connected with the hollow shaft cooperation, stop gear is connected with handle footpath portion and adjustment mechanism respectively.

Description

Femoral stem capable of adjusting stem length

Technical Field

The utility model relates to the technical field of femoral stems, in particular to a femoral stem capable of adjusting the length of the stem.

Background

As is well known, a femoral stem is a medical surgical instrument, and in artificial hip prosthesis replacement, the femoral stem of the artificial hip prosthesis needs to be implanted into a human body to replace a diseased human hip joint. During implantation, loosening of the prosthesis is a major cause of failure of the prosthesis, so that the stability of the prosthesis in the human body is an important factor affecting the service life of the prosthesis. The primary replacement hip joint prosthesis generally adopts proximal fixation, and if patients suffering from proximal osteoporosis are encountered, the stability of the prosthesis cannot be ensured. The defects of the prior art are that the stability of the implanted prosthesis can not be well guaranteed if a patient with osteoporosis is met, the handle length of the femoral stem can not be adjusted, and the distal end fixation can not be adopted.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problems, the utility model provides the femoral stem capable of adjusting the stem length, which can improve the adaptability of users, increase the functional diversity of the device and reduce the use limitation.

The utility model discloses a femoral stem capable of adjusting the length of a stem, which comprises a stem diameter part, an adjusting rod, a stem rod, a spur rack, a bearing, a hollow shaft, a driving gear, an adjusting mechanism and a limiting mechanism, wherein an inner cavity is arranged at the bottom end of the stem diameter part, the top end of the adjusting rod is matched and slidably connected with the inner cavity of the stem diameter part, the stem rod is matched and installed at the bottom end of the adjusting rod, the spur rack is matched and installed inside a groove cavity of the adjusting rod, the bearing is matched and installed in shaft holes at the front end and the rear end of the inner cavity of the stem diameter part, the hollow shaft is matched and rotatably connected with the bearing, the driving gear is coaxially matched and connected with the hollow shaft, the driving gear is meshed and in transmission connection with the spur rack, the adjusting mechanism is matched and connected with the hollow shaft, and the limiting mechanism is respectively connected with the stem diameter part and the adjusting mechanism.

The utility model relates to a femoral stem capable of adjusting the length of the stem, wherein an adjusting mechanism comprises a driving rod, a piston cylinder, a piston slide block, a positioning pin, a first spring and an adjusting cap, the driving rod is in matched sliding connection with a hollow shaft through cavity, the piston cylinder is installed inside a through hole at the rear side of the driving rod, the piston slide block is in matched sliding connection with a piston cylinder cavity, the positioning pin is installed on the piston slide block in a matched manner, the first spring is respectively in matched connection with the piston slide block, two groups of limiting grooves are formed inside the hollow shaft through cavity, the positioning pin is in matched connection with the hollow shaft limiting grooves, the adjusting cap is installed at the front end of the driving rod in a matched manner, a placing groove is formed at the front end of a stem diameter part, and the limiting mechanism is in matched connection with the driving rod.

The femoral stem capable of adjusting the stem length comprises a ratchet gear and a limiting pin, wherein the ratchet gear is coaxially matched and connected with a driving rod, the front end of the ratchet gear is matched and connected with the rear end of an adjusting cap, the limiting pin is matched and installed in a holding groove in the stem diameter part, and the limiting pin is matched and connected with the ratchet gear.

The femoral stem capable of adjusting the length of the stem further comprises a limiting plate and a second spring, wherein a stepped groove is formed in the rear end of the inner portion of the hollow shaft through cavity, the limiting plate is rotatably installed at the rear end of the driving rod in a matched mode, and the second spring is connected with the rear end of the driving rod and the front end of the limiting plate in a matched mode.

The femoral stem capable of adjusting the length of the stem further comprises openings arranged at the left end and the right end of the stem diameter part placing groove.

The femoral stem capable of adjusting the length of the stem further comprises an adjusting cap, and anti-skid lines are arranged on the outer wall of the adjusting cap.

The femoral stem capable of adjusting the length of the stem further comprises a conical connecting part of the positioning pin and the hollow shaft.

The femoral stem capable of adjusting the length of the stem further comprises a limiting pin, and the front end of the limiting pin is provided with a round angle.

Compared with the prior art, the utility model has the beneficial effects that: make handle pole and the cooperation sliding connection of handle footpath portion through adjusting the pole, make the hollow shaft rotate with the cooperation of handle footpath portion through the bearing and be connected, make drive gear rotate through bearing and hollow shaft cooperation and support in the spur rack inner chamber, make the hollow shaft provide rotation power through adjustment mechanism, it rotates to be connected with the spur rack meshing through the hollow shaft and makes the position of adjusting the pole and being located handle footpath portion inner chamber adjust, it adjusts with the interval of handle footpath portion to make the handle pole move through adjusting the pole position, make the position after handle footpath portion and the handle pole are adjusted lock through stop gear, improve and use crowd's adaptability, increase device function diversity, reduce and use the limitation.

Drawings

FIG. 1 is a schematic front view of the present invention;

FIG. 2 is a schematic cross-sectional structural view of the present invention;

FIG. 3 is an enlarged view of the portion A of FIG. 2;

FIG. 4 is a schematic view of the interior of the components of the present invention;

in the drawings, the reference numbers: 1. a shank diameter portion; 2. adjusting a rod; 3. a handle bar; 4. straight rack; 5. a bearing; 6. a hollow shaft; 7. a drive gear; 8. a drive rod; 9. a piston cylinder; 10. a piston slide block; 11. positioning pins; 12. a first spring; 13. an adjusting cap; 14. a ratchet gear; 15. a spacing pin; 16. a limiting plate; 17. a second spring.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the utility model but are not intended to limit the scope of the utility model.

As shown in fig. 1 to 4, the femoral stem capable of adjusting the stem length of the present invention comprises a stem diameter portion 1, an adjusting rod 2, a stem rod 3, a spur rack 4, a bearing 5, a hollow shaft 6, a driving gear 7, an adjusting mechanism and a limiting mechanism, wherein an inner cavity is arranged at the bottom end of the stem diameter portion 1, the top end of the adjusting rod 2 is in sliding connection with the inner cavity of the stem diameter portion 1 in a matching manner, the stem rod 3 is installed at the bottom end of the adjusting rod 2 in a matching manner, the spur rack 4 is installed inside a groove cavity of the adjusting rod 2 in a matching manner, the bearing 5 is installed in shaft holes at the front end and the rear end of the inner cavity of the stem diameter portion 1 in a matching manner, the hollow shaft 6 is in rotating connection with the bearing 5 in a matching manner, the driving gear 7 is in coaxial matching connection with the hollow shaft 6, the driving gear 7 is in transmission connection with the spur rack 4 in a meshing manner, the adjusting mechanism is connected with the hollow shaft 6 in a matching manner, and the limiting mechanism is respectively connected with the stem diameter portion 1 and the adjusting mechanism; make

handle pole

3 and 1 cooperation sliding connection of handle footpath portion through adjusting pole 2, make hollow shaft 6 rotate with the cooperation of handle footpath portion through bearing 5 and 6 cooperations of hollow shaft and be connected, make drive gear 7 rotate through bearing 5 and the cooperation of hollow shaft and support in spur rack 4 inner chamber, make hollow shaft 6 provide rotation power through adjustment mechanism, it adjusts to drive gear 7 to rotate and be connected the position that makes adjusting pole 2 be arranged in 1 inner chamber of handle footpath portion with the meshing of spur rack 4 through hollow shaft 6, make

handle pole

3 and 1 interval of handle footpath portion adjust through adjusting 2 position movements of pole, the position after stop gear makes handle footpath portion 1 and handle pole 3 adjust locks, improve and use crowd's adaptability, increase device function diversity, reduce and use the limitation.

The utility model relates to a femoral stem capable of adjusting the length of the stem, wherein an adjusting mechanism comprises a driving rod 8, a piston cylinder 9, a piston slide block 10, a positioning pin 11, a first spring 12 and an adjusting cap 13, the driving rod 8 is in matched sliding connection with a through cavity of a hollow shaft 6, the piston cylinder 9 is installed inside a through hole at the rear side of the driving rod 8, the piston slide block 10 is in matched sliding connection with a cavity of the piston cylinder 9, the positioning pin 11 is installed on the piston slide block 10 in a matched manner, the first spring 12 is respectively in matched connection with the piston slide block 10, two groups of limiting grooves are arranged inside the through cavity of the hollow shaft 6, the positioning pin 11 is in matched connection with the limiting grooves of the hollow shaft 6, the adjusting cap 13 is installed at the front end of the driving rod 8 in a matched manner, a placing groove is arranged at the front end of a stem diameter part 1, and the limiting mechanism is in matched connection with the driving rod 8; make actuating lever 8 and hollow shaft 6 cooperation position spacing through locating pin 11 and the cooperation of hollow shaft 6 spacing groove, it is spacing to make locating pin 11 removal orbit carry on through piston slide 10 and the cooperation sliding connection of piston cylinder 9, it is connected with the cooperation of hollow shaft 6 spacing groove to make locating pin 11 and piston cylinder 9 cooperation sliding connection through first spring 12, make actuating lever 8 and hollow shaft 6 be connected the push-and-pull removal of being convenient for through adjusting cap 13, prevent external interference when making adjusting cap 13 accomodate through 1 front end standing groove of handle footpath from causing the rotation, increase device operation convenience, improve device function woolen cloth variety, reduce the use limitation.

According to the femoral stem capable of adjusting the length of the stem, the limiting mechanism comprises a ratchet gear 14 and a limiting pin 15, the ratchet gear 14 is coaxially matched and connected with the driving rod 8, the front end of the ratchet gear 14 is matched and connected with the rear end of the adjusting cap 13, the limiting pin 15 is matched and installed in the placing groove of the stem diameter part 1, and the limiting pin 15 is matched and connected with the ratchet gear 14; the driving rod 8 is connected with the shank diameter part 1 for locking through the matching connection of the ratchet gear 14 and the limiting pin 15, the connection stability of the device is improved, and the interference of the rotation of the driving rod 8 to the use of the device is prevented.

The femoral stem capable of adjusting the length of the stem further comprises a limiting plate 16 and a second spring 17, a stepped groove is formed in the rear end of the inner portion of the through cavity of the hollow shaft 6, the limiting plate 16 is rotatably installed at the rear end of the driving rod 8 in a matched mode, and the second spring 17 is connected with the rear end of the driving rod 8 and the front end of the limiting plate 16 in a matched mode; rotate with the actuating lever 8 through limiting plate 16 and be connected and make hollow shaft 6 and actuating lever 8 be convenient for connect the equipment, make limiting plate 16 be connected with actuating lever 8 through second spring 17 and support, make actuating lever 8 activity stroke carry on spacingly through limiting plate 16, prevent that hollow shaft 6 and 8 cooperations of actuating lever from being connected and breaking away from, improve device connection stability, increase the simple operation nature.

The femoral stem capable of adjusting the length of the stem further comprises openings arranged at the left end and the right end of the placing groove of the stem diameter part 1; set up to the opening through handle footpath 1 standing groove left and right sides and make adjusting cap 13 be convenient for shift out handle footpath 1 and prevent the groove, reduce the device drive degree of difficulty, increase device simple operation nature.

The femoral stem capable of adjusting the length of the stem further comprises an adjusting cap 13, wherein the outer wall of the adjusting cap is provided with anti-skid lines; the anti-slip lines are arranged on the outer wall of the adjusting cap 13, so that the sliding friction force in the rotating process is increased, the adjusting operation convenience is improved, and the interference caused by hand slip is prevented.

The femoral stem capable of adjusting the length of the stem further comprises a conical connecting part of a positioning pin 11 and a hollow shaft 6; the connection part of the positioning pin 11 and the hollow shaft 6 is provided with a conical positioning pin 11 connected with a limiting groove of the hollow shaft 6 so as to be convenient to break away, the convenience of the slotted hole of the device is improved, and the dead connection lock is prevented.

The femoral stem capable of adjusting the length of the stem further comprises a limiting pin 15, wherein the front end of the limiting pin is provided with a round angle; set up the fillet through spacer pin 15 front end and make ratchet 14 and spacer pin 15 cooperation degree of difficulty reduce, improve device functional diversity, increase the device and control the convenience.

The femoral stem with the length adjustable is common in mounting mode, connecting mode or setting mode, and can be implemented as long as the beneficial effects of the femoral stem are achieved.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims

1. A femoral stem capable of adjusting the length of a stem is characterized by comprising a stem diameter part (1), an adjusting rod (2), a stem rod (3), a spur rack (4), a bearing (5), a hollow shaft (6), a driving gear (7), an adjusting mechanism and a limiting mechanism, wherein an inner cavity is arranged at the bottom end of the stem diameter part (1), the top end of the adjusting rod (2) is in matched sliding connection with the inner cavity of the stem diameter part (1), the stem rod (3) is installed at the bottom end of the adjusting rod (2) in a matched manner, the spur rack (4) is installed inside a groove cavity of the adjusting rod (2), the bearing (5) is installed in shaft holes at the front end and the rear end of the inner cavity of the stem diameter part (1) in a matched manner, the hollow shaft (6) is in matched rotating connection with the bearing (5), the driving gear (7) is in coaxial matched connection with the hollow shaft (6), the driving gear (7) is in meshed transmission connection with the spur rack (4), the adjusting mechanism is connected with the hollow shaft (6) in a matched manner, the limiting mechanism is respectively connected with the handle-diameter part (1) and the adjusting mechanism.

2. The femoral stem capable of adjusting the length of the stem according to claim 1, wherein the adjusting mechanism comprises a driving rod (8), a piston cylinder (9), a piston slider (10), a positioning pin (11), a first spring (12) and an adjusting cap (13), the driving rod (8) is in fit sliding connection with the through cavity of the hollow shaft (6), the piston cylinder (9) is installed inside the through hole at the rear side of the driving rod (8), the piston slider (10) is in fit sliding connection with the cavity of the piston cylinder (9), the positioning pin (11) is in fit installation on the piston slider (10), the first spring (12) is respectively in fit connection with the piston slider (10), two sets of limiting grooves are arranged inside the through cavity of the hollow shaft (6), the positioning pin (11) is in fit connection with the limiting groove of the hollow shaft (6), the adjusting cap (13) is in fit installation at the front end of the driving rod (8), a placing groove is arranged at the front end of the stem diameter part (1), the limiting mechanism is connected with the driving rod (8) in a matching way.

3. The femoral stem capable of adjusting the stem length according to claim 1, wherein the limiting mechanism comprises a ratchet gear (14) and a limiting pin (15), the ratchet gear (14) is coaxially and cooperatively connected with the driving rod (8), the front end of the ratchet gear (14) is cooperatively connected with the rear end of the adjusting cap (13), the limiting pin (15) is cooperatively installed inside the placing groove of the stem diameter portion (1), and the limiting pin (15) is cooperatively connected with the ratchet gear (14).

4. The femoral stem with the adjustable stem length according to claim 1, further comprising a limiting plate (16) and a second spring (17), wherein a stepped groove is formed in the rear end of the hollow shaft (6) inside the through cavity, the limiting plate (16) is rotatably mounted at the rear end of the driving rod (8) in a matched manner, and the second spring (17) is connected with the rear end of the driving rod (8) and the front end of the limiting plate (16) in a matched manner.

5. The femoral stem with the adjustable stem length as claimed in claim 1, further comprising a notch formed at the left and right ends of the placement groove of the stem diameter part (1).

6. The femoral stem with the adjustable stem length as claimed in claim 2, further comprising an adjusting cap (13) with anti-slip lines on the outer wall.

7. A femoral stem with adjustable stem length in accordance with claim 1, further comprising a tapered shape at the junction of the alignment pin (11) and the hollow shaft (6).

8. A femoral stem with adjustable stem length according to claim 1, further comprising a stop pin (15) with a rounded front end.