A dental mirror comprising a handle with a reflecting mirror mounted at one end, an air jet tube secured to the handle and arranged to direct a flow of air onto the reflecting face of the mirror, and including a water supply tube from which droplets of water are supplied into the air stream from the air jet tube, this water clearing the mirror face of any debris obscuring the dentist's vision.

A vibration device is provided for use with a tooth-extracting instrument. In one embodiment, the device comprises an integral power-driven unit adapted to be strapped to the hand holding the instrument. In another embodiment, both the instrument and the vibrating device are carried by an arm of a dental machine. The vibrations imparted to the instrument facilitate removal of the tooth.

A vibratory massage apparatus comprises a frame from which is suspended a pair of rings lying in a vertical plane and at a height allowing a person to hang by his hands freely from the rings. Each of these rings is carried in a respective rider that is mounted on an eccentric disc carried on a common horizontal shaft of a motor. The disks are offset by 180.degree. to each other so that as the motor shaft rotates the one ring goes up and the other down and vice versa. A crosspiece at the lower re...

A saliva ejector is formed with a flattened body having an internal suction passage extending along the bottom and continuous to the top of the body. Suction apertures are provided in both the bottom and the top so that suction relief is provided at the top of the ejector, even though lower apertures are blocked by soft tissue. The body of the ejector is made of two mating plates that are snapped together and clamp over the end of a vacuum tube to be connected to the ejector. The extent of the f...

A far-field radio frequency (RF) telemetry system for communicating with an implantable medical device includes a diversity antenna system. Multi-frame messages each including multiple outgoing data frames are transmitted to the implantable medical device. In response, the implantable medical device transmits response data frames each following one or more of the outgoing data frames, according to a predetermined communication protocol. An antenna control circuit selects an antenna of the divers...

An optical wireless communications system has a first optical wireless communications apparatus for transmitting a pilot beam and a second optical wireless communications apparatus for receiving the pilot beam to have a match for an optical axis of the first optical wireless communications apparatus and another optical axis of the second optical wireless communications apparatus. The first optical wireless communications apparatus has a modulator for modulating the pilot beam with a specific sig...

An electrosurgical apparatus having improved placement accuracy is provided. The electrosurgical apparatus comprises an elongate shaft having a proximal end, a distal end and at least one lumen therethrough, a stylet positioned within a lumen, a conductive tip at the distal end for delivery of energy to the tissue, an electrical coupling at or near the proximal end for flexibly coupling a power source control unit to supply energy to the conductive tip, a fluid delivery connection interface flex...

A wireless communications system optimizes performance by dividing communications functionality between a wireless pacemaker and a wireless monitoring base station according to the design constraints imposed by the system elements. Typical design constraints include high frequency operation, low pacemaker power consumption, reasonable range, high data rate, minimal RF radiation of internal circuitry, small pacemaker antenna system, simple pacemaker RF circuit design, high reliability, low pacema...

An electrosurgical system comprises a generator and an instrument including a first electrode, a second electrode, and an insulating spacer separating the first and second electrodes. The generator repeatedly measures a characteristic of the radio frequency output such as the impedance between the first and second electrodes. The generator analyses the impedance measurements, and interrupts the radio frequency signal when the rate of change of the impedance is such as to indicate the onset of a ...

Charge removing light is guided by an optical path defining member (623) from a charge removing unit (6) toward a photosensitive drum (2). A distance between an end surface (623e) of the optical path defining member (623) and a surface on an axially central part of the photosensitive drum (2) is less than a distance between the end surface (623e) and the surface on the axially opposite ends of the photosensitive drum (2). Thus an irradiation width and an amount of the charge removing light proje...