A body cavity inserting instrument for use in an instrument for medical treatment comprises a flexible tubular member, a bending member made of an elastic material and an operating wire, said bending member having its front end fixed to the front end of said operating wire and its rear end fixed to the vicinity of the front end portion of said tubular member, thereby the front end portion of said tubular member being bent by allowing said bending member to bend by operating said operating wire o...

A microwave cavity (1) for drying/heating having at least one microwave source (6) emitting microwave energy of wavelength W into the cavity (b 1). By design of the size, shape and dimensions of the cavity (1) and the placement of the microwave source/s (6), the number of resonance modes is maximized in a processing zone (8) in the cavity (1), and the number of resonance modes and reflected energy is minimum at the microwave source/s (6).

Polytetrafluoroethylene (PTFE), or like polymeric material is provided for use as a laser cavity material to efficiently couple flash lamp emissions into the laser medium due to its exceptionally high diffuse reflectance characteristic of better than 99%, which increases the laser output by as much as 100%. In one embodiment, a unique technique for fabricating the cavity includes both sintering and providing an optimal packing density prior to sintering, with the sintering to take place at atmos...

An oven cavity housing for a microwave heating device, an electric toaster and the like consists of component plates which are joined together by tubular pieces provided on one of the plates to be joined together and inserted through holes in the other. These pieces have closed top ends, which are crushed so that no openings are left after the plates are joined and pieces of wire or the like will not pass through them to allow microwave energy to leak out.

A seal cavity protector for use with rotary fluid equipment having a seal cavity, defined by a shaft, a shaft housing and a seal engaging the shaft, includes an annular cup-shaped element for securement to the housing at the entrance thereto. The shaft can pass through the element. A plurality of circumferentially spaced apart vent passages extend through the wall of the element. As the equipment rotates fluid passing by the vent passages creates a low pressure area outside the seal cavity where...

An electrical igniter has an outer metal shell within which extends a semiconductive tubular pellet that provides a cylindrical cavity which opens through an orifice formed by an inturned lip of the shell which forms a first electrode of the igniter. The diameter of the cavity and the diameter of the orifice are in the ratio of about 5 to 6. A second electrode extends axially within the shell into the rear end of the pellet with which it makes electrical contact. Discharge between the first and ...

A glass ceramic reflector having a uniform material composition which has an almost 100% reflectivity that is diffusive in the reflectance range of the entire solar spectrum from 450 to 900 nm wavelength. Furthermore, the ceramic material has a high absorption of ultraviolet wave lengths and low reflectivity in the infrared region to minimize thermal loading of the laser rod of high gain laser material. In one preferred embodiment, the glass ceramic reflector is mica based and has a composition ...

A lasing medium (3) and a Raman medium (20) share a common optical cavity. The lasing medium (3) projects laser light into the Raman medium (20) and, when a threshold intensity within the Raman medium is reached, the Raman medium absorbs the laser light and re-radiates coherent light at a shifted frequency. Optical elements within the system provide an optical cavity for the lasing medium and a second cavity for the Raman medium.

This invention relates to an external cavity slab laser system for pulsed or continuous wave operation consisting of an optically excited, water cooled single or multiple active mirror slab configurations with the external cavity formed by the active mirror and a passive mirror set parallel to each other and separated from each other by a distance greater than the thickness of the slab. Laser beams of both circular and elliptical cross-section can be amplified by the invention which has applicat...

A device for irrigating the teeth and bucal tissues comprises a flexible laminar adaptor for placement between the lips and teeth. The adaptor is provided with irrigation nozzles connected to a water supply, and an outlet connected to a drain. The entire mouth is irrigated, as the teeth are not enclosed.