til] 4,018,911  Apr. 19, 1977
 References Cited
UNITED STATES PATENTS
3,758,382 9/1973 Knorpp 195/1.8
3,851,246 11/1974 Curby et al 195/1.8
3,952,536 4/1976 Faust et al 195/1.8
Primary Examiner—Sum Rosen
Attorney, Agent, or Firm—R. S. Sciascia; L. I. Shrago; C. E. Vautrain, Jr.
A rigid metal holder having perforated side plates for containing plastic bags of human red blood cells for both freezing and thawing such cells is provided. Hydroxyethylstarch, HES, is used as the cryoprotective agent and, together with the perforated metal plates, permits the very fast freezing rates required to produce viable red cells. The HES is transfusable with the thawed cells so that post-thaw washing is obviated.
4 Claims, 6 Drawing Figures