Abstract: A rotatable arm is provided which provides an ability to rotate a working end of an instrument such as a surgical retractor. Rotation of a key hub transfers torque to a drive hub which causes an extension or retraction of a lead screw along a center axis of the rotating arm. The extension or retraction forces a drive pin to bear against sides of helical slots of a driven tip, producing a rotation of the driven tip along a pitch line of the helical slots. The driven tip is connected to the working end such that the two rotate together. The rotatable arm has a low profile, a non-reversible torque transmission, and may be hermetically sealed.

Abstract: A dining plate includes a top portion with a substantially transparent window therein. The plate also includes a bottom portion with a bottom surface having a first outside receiving groove and second inside receiving groove. The bottom portion has a generally planar shape that corresponds generally to the shape of the top portion. The bottom portion also has a top surface with a continuous inner standing rib and an outward rim. The top and bottom portions are joined together so that the inner standing rib is releaseably positioned in the inside receiving groove and the outward rim is releaseably positioned in the outside receiving groove. A substantially watertight cavity is formed between a central section of each of the top and bottom portions. The cavity is aligned with the window in the top portion.

Abstract: A rotatable arm is provided which provides an ability to rotate a working end of an instrument such as a surgical retractor. Rotation of a key hub transfers torque to a drive hub which causes an extension or retraction of a lead screw along a center axis of the rotating arm. The extension or retraction forces a drive pin to bear against sides of helical slots of a driven tip, producing a rotation of the driven tip along a pitch line of the helical slots. The driven tip is connected to the working end such that the two rotate together. The rotatable arm has a low profile, a non-reversible torque transmission, and may be hermetically sealed.

Abstract: A dining plate includes a top portion with a substantially transparent window therein. The plate also includes a bottom portion with a bottom surface having a first outside receiving groove and second inside receiving groove. The bottom portion has a generally planar shape that corresponds generally to the shape of the top portion. The bottom portion also has a top surface with a continuous inner standing rib and an outward rim. The top and bottom portions are joined together so that the inner standing rib is releaseably positioned in the inside receiving groove and the outward rim is releaseably positioned in the outside receiving groove. A substantially watertight cavity is formed between a central section of each of the top and bottom portions. The cavity is aligned with the window in the top portion.