Apparatus for cemented implantation of prostheses

United States Patent m

Burke et al.

[li] Patent Number: 4,595,006 [45] Date of Patent: Jun. 17, 1986

[54] APPARATUS FOR CEMENTED

IMPLANTATION OF PROSTHESES

[76] Inventors: Dennis W. Burke, 24 Marine Rd.,

South Boston, Mass. 02127; William
H. Harris, 665 Concord Ave.,
Belmont, Mass. 02178

[21] Appl. No.: 408,468

[22] Filed: Aug. 16, 1982

[51] Int. CI." A61F 1/00

[52] U.S. CI 128/303 R; 623/16;

128/92 E

[58] Field of Search 222/387, 389, 525, 386.5,

222/499; 604/88, 140, 150, 152; 128/92 C, 92 E, 92 R, 92 G, 303 R; 3/1, 1.9, 1.91

[56] References Cited

U.S. PATENT DOCUMENTS

1,718,597 6/1929 Smith 604/88

1,958,429 5/1934 Hartog 222/499

3,206,073 9/1965 Scislowicz 222/52 S

3,486,539 12/1969 Jacuzzi 222/386.5

3,785,379 1/1974 Cohen 604/88

3,983,947 10/1976 Wills et al 222/389

4,375,864 3/1983 Savage 222/499

4,399,814 8/1983 Pratt, Jr. et al 128/92 E

4,405,249 9/1983 Scales 128/92 G

4,424,057 1/1984 House 604/88

Primary Examiner—Richard J. Apley Assistant Examiner—David Isabella

Attorney, Agent, or Firm—Wolf, Greenfield & Sacks

[57] ABSTRACT

Apparatus and method for polymerizing cement under pressurized conditions and for applying the cement under pressure at the appropriate time to a human bone cavity for implantation of a prosthesis, including a stemmed femoral component and an acetabular component. This apparatus alters the physical conditions under which bone cement cures, causing a decrease in cement porosity and thus increasing the resultant cement strength. The apparatus includes a pneumatically actuated gun having a piston for applying pressure to the cement, and applying cement to the bone, a pressurizable housing securable to the gun for containing the cement, and a nozzle having a valve which allows the cement to remain pressurized until application thereof through the nozzle. In one embodiment, one component of a two component polymerizable cement is provided in a sealed bladder secured to the nozzle while the other component is injected into the bladder and mixed with the first component when the cement is ready for use. A vent may be provided in the piston of the pneumatic gun to allow air to escape through the piston to prevent the injection of air into the cement. A sealing gasket may be provided on the end of the nozzle for placement over the open end of the bone cavity so that cement can be applied thereto under pressure.

12 Claims, 10 Drawing Figures