Biocompatible infused absorption glass containing FeO

• US 5,121,748 A
• Filed: 05/13/1991
• Issued: 06/16/1992
• Est. Priority Date: 05/12/1990
• Status: Expired due to Term

• Current Assignee: Schott AG (Carl-Zeiss-Stiftung)
• Original Assignee: Schott Glaswerke
• Inventors: Gaschler, Ludwig, Paschke, Hartmut, Ditz, Hermann
• Primary Examiner(s): Group, Karl
• Assistant Examiner(s): SCHULL, LISA
• Application Number:
  US07/699,038
• Time in Patent Office: 400 Days
• Field of Search: 501/70, 501/66, 501/27, 128/631
• US Class Current: 600/302
• CPC Class Codes: C03C 3/087 containing calcium oxide, e.g. common sheet or container glass
• CPC Class Codes: C03C 4/0007 for biologically-compatible glass
• CPC Class Codes: C03C 4/082 for infrared absorbing glass

Abstract

A biocompatible glass which can be melted using infra-red radiation contains, based on oxide, 65-68% by weight of SiO₂, 0-3% by weight of Li₂ O, 12-14% by weight of Na₂ O, 2.5-4% by weight of K₂ O, 15-17% by weight of Σ alkali metal oxides, 2-3% by weight of MgO, 4.2-5.5% by weight of CaO, 0-2% by weight of BaO, 3-4 % by weight of Al₂ O₃, 0-1.0 by weight of B₂ O₃ and 2.7-4.1% of FeO. The glass, due to its infra-red meltability and its physiological accertability, is suitable for the encapsulation of sensitive materials, such as transponders or minitransmitters, which are implanted in a living body, or as ampoule glass for melt-encapsulation of sensitive substances.

Claims

1. Biocompatible glass consisting essentially of, in % by weight on an oxide basis,

65-68 SiO₂

0-3 Li₂ O

12.0-14.0 Nm₂ O

2.5-4.0 K₂ O

15-17 Σ

alkali metal oxide

2-3 MgO

4.2-5.5 CaO

0-2 BaO

3-4 Al₂ O₃

0-1.0 B₂ O₃

2.7-4.1 FeO.

2. Biocompatible glass according to claim 1 in the form of tubing having a wall thickness of 0.14-1 mm.

3. An ampoule or encapsulate made of tubing according to claim 2.

4. An encapsulate according to claim 3 containing a transponder.

5. A sealed ampoule or encapsulated according to claim 3, wherein the ampoule or encapsulate is sealed by applying infrared radiation thereto.