Biomedical subjects

K Dollinger

Publications and source records attributed to K Dollinger.

3 recordsLinked to original sources

PubMed2002

Field trials with low power lasers concerning the blink reflex.

Laser belonging to class 2 emit in the visible part of the spectrum. The power is limited to 1 mW in the CW mode. Up to now the protection of the eyes has been supposed to be given by the blink reflex for incidentally intrabeam viewing in many regulations. In 3 field trials with 519 test persons we have shown that only 15.9% at 670 nm, 17.2% at 635 nm, and 20.3% at 532 nm had a blink reflex under laser irradiation. An analysis of the results showed neither significant differences concerning the age and the gender of the test persons nor whether they were wearer of glasses or right sighted. The frequent lack of the blink reflex demands organizational measures like instruction using laser class 2 in medical and other applications.

Accidents, Occupational↗

PubMed2002

[Measuring eyelid reflex with electroblepharography].

Safety regulations concerning the handling of low power lasers in the visible region (Class 2, according to DIN EN 60825-1) assume that the eye is protected by the eye-blink reflex, which should have completed within 250 ms during laser impact into the eye. A method has been developed to determine the temporal progression of the blink reflex by measuring the biosignal of the upper eyelid movement. In this procedure, which we call Electroblepharography (EBG), the electrical signal of the eyelid muscle is gained by means of self adherent electrode pads and is evaluated and charted after analog signal processing in the EBG-device. The graphical representation of the biopotential corresponds to the temporal position of the upper eyelid. Characteristic values as latency-time, position and velocity of the eyelid can be deduced.

Blinking↗

PubMed1992

An electrohydrothermosation system for application in endolaryngeal and enoral surgery: a technical report.

The use of medical lasers or high-frequency (HF) devices ('electrocautery') allows the dissection of tissue by an application of heat. The main advantage of such techniques is the reduction of intra-operative bleeding. On the other hand, carbonization and coagulation lead to difficulties in the histological investigation of the resected specimen. Electrohydrothermosation (EHT) systems are irrigation-supported HF devices. The cutting or coagulation electrodes are continuously rinsed with distilled water in order to minimize thermal interactions with the tissue. We developed an EHT system for endoscopic head and neck surgery. The system was used to remove defined specimens from pig larynges and tongues experimentally. We compared the results with those obtained by a surgical CO2 laser and found that carbonization and overall tissue damage were less severe with EHT than with laser surgery. This leads to the conclusion that EHT is an improvement of conventional HF surgery and may be an alternative to laser surgery in the head and neck.

Animals↗