Blank for acetabular prosthesis

• US 4,324,006 A
• Filed: 05/11/1978
• Issued: 04/13/1982
• Est. Priority Date: 05/30/1977
• Status: Expired due to Term

• Current Assignee: Charnley Surgical Inventions Limited
• Original Assignee: Charnley Surgical Inventions Limited
• Inventors: Charnley, John
• Primary Examiner(s): Crowder, Clifford D.
• Application Number:
  US05/904,752
• Time in Patent Office: 1,433 Days
• Field of Search: 3/1.912, 3/1.913, 3/1.9, 3/1.91, 3/1.911, 128/92 CA, 128/92 C
• US Class Current: 623/22.21
• CPC Class Codes: A61F 2/34 Acetabular cups
• CPC Class Codes: A61F 2002/30576 with extending fixation tabs
• CPC Class Codes: A61F 2002/30708 Means for distinguishing between left-sided and right-sided devices, Sets comprising both left-sided and right-sided prosthetic parts
• CPC Class Codes: A61F 2002/3071 Identification means; Administration of patients
• CPC Class Codes: A61F 2002/30822 Circumferential grooves
• CPC Class Codes: A61F 2002/30827 Plurality of grooves
• CPC Class Codes: A61F 2002/30831 perpendicular with respect to each other
• CPC Class Codes: A61F 2002/3096 trimmed or cut to a customised size
• CPC Class Codes: A61F 2002/3429 with an integral peripheral collar or flange, e.g. oriented away from the shell centre line
• CPC Class Codes: A61F 2002/3493 Spherical shell significantly greater than a hemisphere, e.g. extending over more than 200 degrees
• CPC Class Codes: A61F 2002/4631 the prosthesis being specially adapted for being cemented
• CPC Class Codes: A61F 2250/0084 Means for distinguishing between left-sided and right-sided devices; Sets comprising both left-sided and right-sided prosthetic parts
• CPC Class Codes: A61F 2250/0089 coded with symbols, e.g. dots, numbers, letters, words

Abstract

An acetabular prosthesis for use in an artificial hip joint. Because acetabula vary in size, it is not practicable to produce a single prosthesis for each acetabulum, being preferable to provide a blank which can be manually trimmed to fit each acetabulum. Here a blank is used in the formation of an acetabular prosthesis comprising a body surrounding and defining a part-spherical socket whose entrance is surrounded by an annular rim and having a flange extending outwardly and rearwardly from the periphery of the rim and made of a material capable of being manually trimmed to be asymmetrical. The flange may be marked with cutting lines to indicate where it should be trimmed to fit a left or right acetabulum.

Claims

1. A blank for use in the formation of an acetabular prosthesis and comprising:

a body having a blind part-spherical socket, an annular rim surrounding the socket entrance and having a flange extending outwardly of and rearwardly from the rim periphery, the flange being marked with cutting lines for the trimming of same to a non-uniform width.

2. A blank as claimed in claim 1, wherein the flange is in the form of two diametrically opposite lobes.

3. A blank as claimed in claim 2, wherein each lobe is marked with cutting lines.