Granted Patent B2

US 12,359,287 · App. 18/099,384 · Granted Jul 15, 2025

Inventor: Prashant N. Kumta (Pittsburgh, PA)

Assignee: UNIVERSITY OF PITTSBURGH—OF THE COMMONWEALTH SYSTEM OF HIGHER EDUCATION

C22C23/06

Abstract

Claims (16)

1. A biodegradable medical implant device, comprising:

a metal alloy, consisting of:

from about 4.0-4.5 weight percent of zinc;

from about 0.3-0.5 weight percent of zirconium;

optionally, from about 0.25-1.0 weight percent of strontium;

optionally, from about 0.25-1.0 weight percent of cerium;

optionally, from about 1.0 to about 9.0 weight percent aluminum;

optionally, from about 0.1 to about 1.0 weight percent manganese;

optionally from about 0.25 to about 1.0 weight percent silver; and

a balance of magnesium including impurities, based on the total weight of the composition,

wherein the metal alloy has an average grain size from about 50 to about 100 μm, and wherein the metal alloy forms a primary phase of Mg (ZnZr), and an intermetallic secondary phase of Mg 7 Zn 3 precipitate is minimized or precluded in the metal alloy.

2. The device of claim 1 , wherein the zinc constitutes about 4.0 weight percent and the zirconium constitutes about 0.5 weight percent.

3. The device of claim 1 , wherein the zinc constitutes about 4.4 weight percent and the zirconium constitutes from about 0.3-0.4 weight percent.

4. The device of claim 1 , wherein strontium and/or cerium is present.

5. The device of claim 1 , wherein aluminum and/or manganese and/or silver is present.

6. The device of claim 1 , wherein the yield strength is 96 MPa or about 286.6 MPa and the ultimate tensile strength is 176 MPa or about 327.2 MPa.

Assignments (1)

Continuity (4)

References Cited (18)