Dynatech Corporation

Joseph A Holroyd

J P Barger

Robert K Mitchiner

An improved liquid-filming apparatus of the type which utilizes centrifugal action to distribute blood on a specimen-display surface, i.e. on a conventional laboratory slide, and which utilizes a waste-collecting means about the perimeter of the slide display surface. The invention is based on the discovery that the display surface is advantageously related to the surrounding structure in such a way that blood does not disintegrate into minute droplets upon leaving the slide surface and before it can be immobilized in the collecting means. By providing a transitional blood-receiving surface immediately adjacent the supply surface, applicant has avoided the problem of such disintegration.

Blood filming process

An improved defrostable cryosurgical instrument has a unitary in-line valve assembly that permits the assembly to be contained right in the instrument itself without making the instrument unduly large, heavy or upsetting its balance. By a fingertip control right in the instrument itself, the valve assembly can be controlled to route refrigerant through the instrument's tip to operate the instrument in a freeze mode, a defrost mode and to turn the instrument off, while simultaneously depressurizing the tip.

Cryosurgical instrument

Apparatus for forming a film of blood or other body fluid sample on a microscope slide. The slide is surrounded by a member adapted to catch and immobilize excess blood thrown from the slide by centrifugal force. The member, which advantageously rotates with the slide while positioned in a waste-receiving mode, advantageously comprises a pocket filled with highly porous blood-receiving material and is adapted to be moved vertically out of the waste-receiving mode to facilitate positioning and removal of the slide from the apparatus.

Growing community of inventors

Nabnasset, MA, United States of America

Joseph A Holroyd