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Separation device

A drive shaft, cam technology, applied in medical science, hip joint, prosthesis, etc., can solve the problems of easy failure of the sleeve, unusable, no space, etc.

Inactive Publication Date: 2012-03-21
SMITH & NEPHEW PLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In some cases where space is restricted, there is not enough room and therefore this sleeve cannot be used
[0004] Sockets with threaded sections are very difficult to manufacture compared to sockets without threaded sections
[0005] Sockets with threaded portions are prone to failure due to thread tampering caused by the breakaway device through the threaded plug

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0054] Figures 1a-1h A device ( 1 ) according to an embodiment of the invention is represented. The device (1) comprises a drive shaft (2) having a proximal end (3) and a distal end (4). The proximal end (3) has a protrusion (5) that is grasped by any suitable means, such as a user's fingers or pliers, in order to apply torque to the shaft (2). The distal end (4) of the drive shaft (2) has a cam (6). The cam (6) is arranged such that when torque is applied to the drive shaft (2) via the proximal end (3), the cam (6) acts in a direction substantially parallel to the axis of the drive shaft (2).

[0055] Figure 1a and 1b is a side view of device (1). Figure 1c is a bottom plan view showing cam (6). Figure 1d -g indicates cam(6) in more detail. Figure 1b The protrusion (5) is shown in more detail.

[0056] The user can insert the distal end (4) into the hollow space between the leading surface of the sleeve and the inner surface of the implant head (see Figure 6 ), ...

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PUM

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Abstract

A device (1, 7) for separating a sleeve from an implant head, comprises a drive shaft (2) having a proximal end (3) and a distal end (4), the distal end having a cam (6), wherein the cam is disposed such that when, in use, a torque is applied to the drive shaft via the proximal end the cam acts in a direction substantially parallel to the axis of the drive shaft. The invention discloses a method of separating a sleeve from an implant head using such a device.

Description

technical field [0001] The present invention relates to a detachment device, and in particular to a device for detaching a sleeve from an implant head. For example, if an incorrect selection (head or sleeve) is made, the sleeve can become stuck within the implant head, eg the hip implant head. In this case, manual force applied directly by the user (ie without the aid of a device / tool) may not be sufficient to remove the sleeve. Therefore, an appropriate device is required. Background technique [0002] Existing tapered sleeves have internal threads at the base of the cone. To remove this tapered sleeve, a device with a threaded spigot is used to screw into the bottom surface of the tapered sleeve and against the concave inner surface of the implant head, thereby forcing the sleeve and implant head separate. Such a device will not work with sockets that do not have threads. [0003] Such sleeves require sufficient space for the bottom surface at the bottom of the sleeve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61F2/46
CPCA61F2002/4623A61F2002/30332A61F2/4637A61F2220/0033A61F2002/4641A61F2/4014A61F2/3609A61F2002/30738A61F2/4603
Inventor N·特纳
Owner SMITH & NEPHEW PLC