BioSurface Technology Inc. of Cambridge, Mass., was issued U.S.patent No. 5,145,770 for cryopreservation, a method of freezingand thawing Allografts, or cultured human skin products, thecompany said Tuesday.

The technique allows for the long-term storage of Allografts forready use by clinicians as biologically active, wound-healingproducts. BioSurface was also given worldwide rights to basictechnology for cryopressed tissue products.

The patent covers the use of two types of freezing agents,which are used in combination, and a method for thawingfrozen epithelial tissue. The technique facilitates the large-scaleproduction of Allografts. by increasing the time

Cryopreserved Allografts are being tested for use in treatingwounds resulting from burns.

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