Thighbone shaft

• US 7,753,961 B2
• Filed: 01/14/2005
• Issued: 07/13/2010
• Est. Priority Date: 01/14/2005
• Status: Active Grant

• Current Assignee: Chen-Yu Lung, Tain-Hsiung Chen
• Original Assignee: United Orthopedic Corporation
• Inventors: Lung, Chen-Yu, Chen, Tain-Hsiung
• Primary Examiner(s): Willse; David H.
• Application Number:
  US11/034,942
• Publication Number:
  US 20060161262A1
• Time in Patent Office: 2,006 Days
• Field of Search: 623 211- 214, 623 224- 2242, 623 2243- 2244, 623/22.46, 623/23.24, 623/23.26, 623/23.27, 623/23.29, 623/23.3, 623/23.31, 623/20.36, 623/23.14, 623/23.15, 623/23.18, 623/23.23, 623/23.33, 623/23.35, 623/23.44, 623/23.46, 606/84, 606/85, 606/89, 606 62- 63
• US Class Current: 623/22.46
• CPC Class Codes: A61B 17/744 the longitudinal elements coupled to an intramedullary nail
• CPC Class Codes: A61F 2/3601 for replacing only the epiphyseal or metaphyseal parts of the femur, e.g. endoprosthetic femoral heads or necks directly fixed to the natural femur by internal fixation devices non-prosthetic internal fixation devices for the femoral head or neck A61B17/74
• CPC Class Codes: A61F 2002/30153 rectangular
• CPC Class Codes: A61F 2002/30332 Conically- or frustoconically-shaped protrusion and recess
• CPC Class Codes: A61F 2002/30354 Cylindrically-shaped protrusion and recess, e.g. cylinder of circular basis
• CPC Class Codes: A61F 2002/30405 made by screwing complementary threads machined on the parts themselves
• CPC Class Codes: A61F 2002/30433 using additional screws, bolts, dowels, rivets or washers e.g. connecting screws
• CPC Class Codes: A61F 2002/30604 modular
• CPC Class Codes: A61F 2002/30774 internally-threaded
• CPC Class Codes: A61F 2002/30782 inclined obliquely
• CPC Class Codes: A61F 2002/30787 inclined obliquely with respect to each other
• CPC Class Codes: A61F 2002/3079 Stepped or enlarged apertures, e.g. having discrete diameter changes
• CPC Class Codes: A61F 2002/30797 internally-threaded
• CPC Class Codes: A61F 2002/30878 with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
• CPC Class Codes: A61F 2002/30904 serrated profile, i.e. saw-toothed
• CPC Class Codes: A61F 2002/3625 Necks
• CPC Class Codes: A61F 2002/365 Connections of heads to necks
• CPC Class Codes: A61F 2220/0025 Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
• CPC Class Codes: A61F 2220/0033 made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2220/0041 using additional screws, bolts, dowels or rivets, e.g. connecting screws
• CPC Class Codes: A61F 2230/0019 : rectangular

Abstract

A thighbone shaft has a pole and a bolt. The pole defines an inclined threaded hole therein. Tooth portions are respectively formed at opposite sides of the pole. A head is arranged on a front portion of the pole. A sleeve is provided on the head. A threaded portion is formed on the bolt and is retained in the inclined threaded hole for engaging the bolt and the pole. The thighbone shaft is assembled easily, reduces planting area and replacement cost, decreases stress force, and promotes planting fixedness.

Claims

1. A thighbone shaft comprising:

a) a pole having;

i) an inclined threaded hole extending through an outer periphery thereof; and

ii) a plurality of steps located on opposing sides of the outer periphery thereof, each of the plurality of steps is offset relative to an adjacent step forming a continuous stepped surface;

b) a head having;

i) a projection having a first end connected to an end of the pole; and

ii) a sleeve located on a second end of the projection;

c) a bolt inserted into the inclined threaded hole and having a threaded portion threadedly connected to the inclined threaded hole; and

d) a fixing element having a shoulder, the pole has a through hole extending axially through a length thereof, the through hole of the pole has a step, the projection of the head has a positioning hole located on the first end and the first end is inserted into the through hole, the fixing element is inserted into the through hole and connected to the positioning hole, and the shoulder of the fixing element engaging the step of the through hole.

2. The thighbone shaft according to claim 1, wherein the sleeve is spaced apart from the pole by a portion of the projection.

3. The thighbone shaft according to claim 1, wherein the threaded portion of the bolt is located on a middle portion thereof, two ends of the bolt protruding from the opposing sides of the pole.