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At least 397 records · Page 22Linked to original sources
PubMed1975

Prototype for an implantable micropump powdered by piezoelectric disk benders.

A prototype for an implantable mul pump to be used in an artificial pancreas has been constructed, in which pressure is developed by a bellows formed from 2 apposed piezoelectric disk benders connected to the high impedance secondary winding of aminiature transformer. Active valving, properly phased, is achieved by a miniature solenoid valve connected in series with the transformer primary winding and a rectangular wave generator.

Artificial Organs↗
PubMed1975

A new radioisotope-powered cardiac pacer.

A small lighweight nuclear pacer is described. The unit weighs 6) Gm. and occupies a bolume of 33 c.c. It is a standard, R-wave inhibited, demand pacer and has been shown to be insensitive to electromagnetic interference. The unit has met all United States and Foreign Atomic Energy Commission (AEC) safety specification requirements, including cechanical shock, industrial fire, accidental crush, cremation, impact, and corrosion. Its calculated life is in excess of 20 years. Extensive dog testing has been completed and will be described in detail elsewhere. The United States AEC has been issued a license to conduct extensive clinical trials. These began in October 1974, and will be the subject of a later report.

Animals↗
PubMed2001

Prosthetic arm monitoring system using a programmable interface controller.

Children with upper extremity limb deficiency are often prescribed a prosthetic arm to assist with daily function. Three types of prostheses are available: passive, active body-powered, and active myoelectric; costs range from $3,000 to $15,000. Clinicians rely on parent and child feedback regarding the usefulness of the prosthesis, and may assess the child's skill in using the device in a controlled setting. However, these methods do not provide an objective quantification of the wear and use of the device during daily activities. The purpose of this project is to develop a sensor to record the amount of time per day the prosthetic arm is worn, and to count the number of times per day the child activates (closes) the prosthetic hand (or terminal device). The system that has been developed can be integrated unobtrusively into a child's prosthetic arm. A programmable interface controller (PIC) with interface circuitry and memory was developed to record the daily wear pattern and hand usage of the prosthesis at 15-minute intervals. Memory and battery capacities are sufficient to record data over a three-month period. A personal computer interface downloads the collected data and may be used to reprogram the device for different time periods of data collection. All components, including the battery, have a mass of 87 grams and fit inside the forearm cavity of a 9-year old's prosthesis. Controlled trials are underway at Shriners Hospital for Children, Northern California, to determine system reliability.

Arm↗
PubMedDate not supplied

Long-term in vivo behavior of a platinum endoauricular-magnesium hybrid battery.

A hybrid bioelectric battery designed for pacemaker feeding was developed and implanted in 15 dogs for a period of 18 or more months. The smooth platinum cathode, set on an intra-cavitary pacing lead, is located in the bloodstream of the right auricle. The anode of pure (99.9 percent) Domal magnesium is placed in the subcutaneous tissue, which is then consumed by a uniform corrosion process. The theoretical consumption for a current output of 200 muA was evaluated according to Faraday's law at 7 g in 9 years; however, the real consumption, taking into account the corrosion phenomenon, is estimated at 14 g in 9 years. This histological tolerance to the magnesium is excellent. The fundamental characteristic of this platinum-magnesium battery is the great reproducibility of the output parameters (voltage, power) and the excellent stability with time, for any chosen platinum surface or load resistance. For an output current of 200 muA, the battery provides an available output power of 100 muW at a reproducible and stable voltage of 0.5 v. This stability is demonstrated in a long-term study on 15 beagles.

Animals↗
PubMed1975

Hemodynamic analysis on prolonged survival cases (30 days and 20 days) of artificial total heart replacement.

High output AH pumping causes a marked decrease in hematocrit, as well as peripheral circulatory insufficiency. By the application of a new control method, based on our hypothesis of regulating the output of the pump, maintenance of normal outputs, long term survival, after total heart replacement, has improved from 10 days to 37 days, with the average survival of 18 days. In addition, the experimentsl animals' general condition has been markeldy improved.

Animals↗
PubMed1975

Electrical neurological stimulation systems: a review of contemporary methodology.

An analysis of the essentials of both external and implantable neurologic stimulation devices is presented. Specific system requirements have been extracted from clinical experience with neurologic hardware for pain inhibition. Application of these devices includes dorsal column stimulation, transcutaneous nerve stimulation and peripheral nerve stimulation. The electrode, an essential component of any neuro-stimulation system, is examined critically, with particular attention to unanswered questions regarding the electrode tissue interface.

Bioelectric Energy Sources↗
PubMed1975

New techniques for vocal rehabilitation.

Following laryngectomy only 40 per cent of patients are able to attain esophageal speech. Several surgical and nonsurgical methods have been devised to solve this problem, but non is fully satisfactory. This paper describes two different experimental apporaches to the problem. A segment of trachea is isolated with an intact blood supply and anastomosed to the skin and esophagus, thus producing a fistula where the characteristic of the tracheo-esophageal junction can be studied. Efforts to implant a valve into this fistula have been unsuccessful but the fistula alone is patent after one year. The isolated tracheal segment provides an ideal model for study in an untracheatomized animal. In the second approach an electromagnetic sound device is being devised which can be implanted in the neck as near as possible to the previous site of the larynx. The results have been encouraging.

Animals↗