Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Implantable prosthesis – Bone
Reexamination Certificate
2001-11-05
2004-04-06
Robert, Eduardo C. (Department: 3732)
Prosthesis (i.e., artificial body members), parts thereof, or ai
Implantable prosthesis
Bone
C623S022460, C623S023210
Reexamination Certificate
active
06716250
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to femoral prosthetic devices and, more specifically to a modular femoral prosthesis having a neck element that can be selectively positioned atop a stem element by inserting a grooved shaft that extends downward from the bottom of said neck element into a corresponding slotted recess originating on a top portion of the stem element and continuing longitudinally partially therethrough. The axial orientation of the neck element relative to the stem element can thus be rotated accordingly during insertion of the grooved shaft into the slotted recess. The stem can be cylindrical in form or tapered.
The size and the amount of grooves in the shaft and the corresponding slots in the recess predetermine the rotational variance from one position to the next, preferably in increments of 5-10 degrees per position to allow for the proper adjustment needed for a particular patient.
In addition, neck elements with varying lengths and offsets are provided to accommodate the needs of individual patients and to work in concert with the selectively rotated neck element to afford the orthopedic surgeon with a versatile modular femoral prosthetic. The surface of the stem portion can be gritblast or porous coated for press fit insertion in which the prosthesis is maintained in place by bone that grows into the porous surface or could be smooth for cementation applications. The modular characteristics of the stem element which becomes integral with the femur whether press fit or cemented and the removable neck element that is removably screwed thereto gives the orthopedic surgeon greater flexibility when a revision is necessary. Furthermore, the rotative capabilities of the neck element upon insertion or reinsertion could preclude the necessity of replacing or removing the stem element from the femur to adjust the angle to the needs of the patient during such a revision.
2. Description of the Prior Art
There are other modular femoral prosthetic devices. Typical of these is U.S. Pat. No. 5,370,706 issued to Richard Bolensky et al. on Dec. 6, 1994 and U.S. Pat. No. 5,507,830 was issued on Apr. 16, 1996 to Michael DeMane et al. On Apr. 16, 1996 Bohn was issued U.S. Pat. Nos. 5,507,833 and 5,549,706 was issued to McCarthy on Aug. 27, 1996.
Another patent was issued to Burke on Oct. 29, 1996 as U.S. Pat. No. 5,569,255. Yet another U.S. Pat. No. 5,645,607 was issued to Hickey on Jul. 8, 1997 and still yet another was issued on Aug. 5, 1997 to McTighe et al. as U.S. Pat. No. 5,653,765.
U.S. Pat. No. 5,702,480 was issued to Kropf et al. On Dec. 30, 1997 and a patent was issued to McTighe et al. on Mar. 10, 1998 as U.S. Pat. No. 5,725,594. Yet another U.S. Pat. No. 5,876,459 was issued to Powell on Mar. 2 1999. Another was issued to Lob et al. on Oct. 24, 2000 as U.S. Pat. No. 6,136,035 and still yet another was issued to Lob et al. on May 29, 2001 as U.S. Pat. No. 6,238,436.
U.S. Pat. No. 5,370,706
Inventor: Richard Bolesky et al.
Issued: Dec. 6, 1994
A modular hip prosthesis for the replacement of a portion of the femur is provided. The prosthesis is assembled from a kit that includes a stem member having an upper portion and a lower portion, with the lower portion sized to be received in the femur. The kit also includes a body member that is sized to replace a portion of the femur and is configured to be received over the upper portion of a stem member. The kit also includes a head member that is sized to replace the head of the femur. A neck member is provided to attach the head member to the body member to form an assembled prosthesis.
U.S. Pat. No. 5,507,830
Inventor: Michael Demane et al.
Issued: Apr. 16, 1996
A modular hip prosthesis can be custom fitted to a particular patient by a surgeon prior to surgical insertion. The prosthesis features a body having a neck portion for carrying a rounded head element, a transitional mid-section of the prosthesis body includes generally rectangular and generally rounded cross-sectional areas, and a stem section has a generally rounded cross-sectional area. The stem is tapered to receive a tubular extension sleeve with a hollowed portion corresponding in shape to the stem portion of the prosthesis. The tubular extension sleeve has an open end portion receptive of the lower tapering stem of the prosthesis body. The stem portion includes an internal bore, and an attachment in the form of an elongated screw is provided for connection to the stem internal bore for securing the extension sleeve and the prosthesis body together, forming a compressive sealed connection therebetween. Pads can be attached to the transitional mid-section of the prosthesis body for increasing the cross-sectional shape of the prosthesis at the transitional mid-section. The pads are loaded continuously to connect to the prosthesis body by the hip joint reaction force. Removable collars can be added to the prosthesis to form a transverse load carrying interface with the upper end of the patient's femur. Frustroconically-shaped extension sleeves can be added to the prosthesis neck for extending the neck length.
U.S. Pat. No. 5,507,833
Inventor: William W. Bohn
Issued: Apr. 16, 1996
A joint replacement system particularly useful in total hip arthroplasty includes a prosthesis presenting a macrotextured dimpled surface thereon for promoting biological fixation of the prosthesis to the surrounding bone. The prosthesis may be, for example, a femoral prosthesis, which is designed for insertion along the intramedullary canal of a bone. The femoral prosthesis presents a body portion having a cruciform cross-section and a distal portion which is wide in the coronal plane for conforming to the endosteum of the bone but narrow in the sagittal plane for provide good flexure with the bone. The femoral prosthesis is configured to leave a portion of the intramedullary canal undisturbed to provide better circulation to the bone-growth regions after surgery. The prosthesis may also be an acetabular component having the macrotextured outer surface which permits the shell-like acetabular component to be thinner and also to avoid the necessity of pins or screws ordinarily required to attach an acetabular component to the acetabulum of the pelvis. The invention further includes a novel method of implanting the prosthesis which includes leaving a portion of the intramedullary canal intact rather than reaming out the intramedullary canal to receive the prosthesis as is conventional.
U.S. Pat. No. 5,549,706
Inventor: Thomas F. McCarthy
Issued: Aug. 27, 1996
A femoral hip prosthesis comprises a main member, a modular member and a means for connecting the two. The main member has a stem portion and a body portion which are adapted for insertion into the intramedullary canal. The body portion has lateral, posterior, and anterior sides adapted to mate with the bone and has a medial side configured and dimensioned to receive a modular member. The modular member is chosen from a plurality of such members of various shapes and sizes and is adapted to fit accurately into the intramedullary canal, especially after the intramedullary canal has been deformed through the prior implantation of a prosthetic hip device.
U.S. Pat. No. 5,569,255
Inventor: Dennis W. Burke
Issued: Oct. 29, 1996
A prosthetic device for the human hip having elongated fins or other like protrusions which are provided on the underside of a collar and which extend into previously formed slots or grooves in the bone. Either a plurality of fins, or a single fin having a non-rectilinear shape is provided. Apparatus for formation of the grooves in the bone includes a mill guide which can be mounted onto the proximal end of a rasp embedded in a cavity formed in the bone. A milling bit is used in conjunction with the mill guide to form precisely located and shaped grooves into which the fins can seat. A clamp is provided for securing the prosthetic device to the femur while the cement is hardening.
U.S. Pat. No. 5,645,607
Inventor: Paul Francis Hickey
Issued: Jul
Kroll Michael I.
Ramana Anuradha
Robert Eduardo C.
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