Abstract: An electrode catheter testing device is shown which provides a practical means for determining, immediately prior to use, whether an electrode catheter is functioning properly. The device includes a pair of telescoping tube members axially displaced by means of a spring and enclosing a braided wire cylinder which defines a core for receiving the electrode end of an electrode catheter. When the spring is manually compressed, the braided wire cylinder's diameter is increased to permit insertion of the catheter. When the spring is released, the braided wire cylinder is elongated and its diameter is contracted such that the cylinder contacts the electrode rings shorting them together. Continuity to each electrode ring may then be measured electrically using a suitable instrument such as a ohmmeter.

Abstract: A outdoorsman's seat comprising a rigid rectangular seat member having canted opposed slots in its longitudinal edges to receive two limbs of a supporting line adapted to be secured to two spaced apart trees. The opposed inclined slots result in a resultant force vector which holds the seat more tightly and securely with increased weight but nevertheless affords easy sliding movement of the seat along the limbs as well as attachment and detachment therefrom.

Abstract: An instrument for the boring of bones to remove a cylindrical section of bone for medical purposes has a one-way drive means which allows the surgeon to oscillate his hand motion while the instrument cuts bone in one direction only. The instrument has a trephine engaging mechanism which allows for the interchangeability of trephines so that a plurality of different types and sizes of trephines can be used to obtain bone cores from a range of bone types.

Abstract: A device useful for the in vitro study of cell migration across a monolayer of epithelial cells while simultaneously measuring the transepithelial electrical resistance of the epithelial monolayer is provided and is characterized as including at least three components, a cylinder, a chamber and a punch. The cylinder is designed for tissue culture, the chamber provides a controlled space and/or environment for the cylinder and the punch is provided to cut the epithelial monolayer and its substrate.