Variable wall thickness interlocking intramedullary nail

Details Variable wall thickness interlocking intramedullary nail Variable wall thickness interlocking intramedullary nail

1988-01-29

1989-10-24

Hafer, Robert A.

Surgery

Truss

Perineal

72367, 128 92YZ, 128 92YK, A61B 1758

Patent

active

048754749

ABSTRACT:
An intramedullary nail comprises a unitary piece of elongate material of tubular cross-section having variations in wall thickness along its length. The nail has a proximal portion, a distal portion and an intermediate portion between the proximal and distal portions. The wall thicknesses of the proximal and distal portions are substantially greater than the wall thickness of the intermediate portion. In preferred embodiments, the outside diameters of the proximal, intermediate and distal portions are substantially equal or, alternatively, the outside diameter of the proximal portion is larger than the substantially equal outside diameters of the distal and intermediate portions. The nail is provided with a longitudinal slot which preferably extends along substantially the entire length of the nail. The nail is also provided with transverse openings through the proximal and distal portions to receive interlocking screws, and a portion of the inside diameter of the proximal portion is threaded to provide a point of attachment for insertion and extraction devices. The invention further includes an advantageous method of making the nail from a single length of material, such as stainless steel tubing. The advantageous method includes the two-step process of machining the intermediate portion of the length of tubing to reduce the outside diameter and wall thickness thereof, while maintaining the inside diameter substantially constant, and swaging either the proximal portion or the distal portion (or both) to reduce the inside and outside diameters thereof, such that the wall thickness of the swaged portion is substantially greater than the wall thickness of the intermediate portion of the tubing. Another aspect of the invention is the provision of a cap for the internally threaded end of the proximal portion to prevent the ingrowth of tissue.

REFERENCES:
patent: 2136471 (1938-11-01), Schneider
patent: 2518019 (1950-08-01), Kane
patent: 3334624 (1967-08-01), Schneider et al.
patent: 3433220 (1969-03-01), Zickel
patent: 3977398 (1976-08-01), Burstein
patent: 3990438 (1976-11-01), Pritchard
patent: 4103683 (1978-08-01), Neufeld
patent: 4212683 (1980-07-01), Murphy
patent: 4341206 (1982-07-01), Perrett et al.
patent: 4375810 (1983-03-01), Belykh et al.
patent: 4381770 (1983-05-01), Neufeld
patent: 4423721 (1984-01-01), Otte et al.
patent: 4446857 (1984-05-01), Otte et al.
patent: 4457301 (1984-07-01), Walker
patent: 4475545 (1984-10-01), Ender
patent: 4622959 (1986-11-01), Marcus
patent: 4628920 (1986-12-01), Mathys, Jr. et al.
patent: 4697585 (1987-10-01), Williams
patent: 4776330 (1988-10-01), Champman et al.

Affiliated with

Also associated with

Rating

Variable wall thickness interlocking intramedullary nail does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Variable wall thickness interlocking intramedullary nail, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Variable wall thickness interlocking intramedullary nail will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1583006