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Biomedical subjects

C E Uhlig

Publications and source records attributed to C E Uhlig.

6 recordsLinked to original sources
PubMed2004

Illuminated artificial orbit for the training of vitreoretinal surgery in vitro.

PURPOSE: Demonstrations and practical experiments are important constituents of the teaching of surgical principles and techniques to residents in ophthalmology. The objective was to develop an eye-support device for experimental and didactic use during vitreoretinal microsurgery in vitro. METHODS: Various eye-support devices with different light sources and illumination intensities were designed and tested. The main components of the final prototype are a high-intensity halogen lamp, a flexible light guide, a cylinder with a mirror inside, and a replaceable, transparent eye support with a ring-adapter. Light from the point source is reflected via the light guide into the cylinder and through the eye support transsclerally into the eye. RESULTS: The device illuminates the retina and the vitreous body sufficiently. It accentuates the transparent appearance of the retina and makes the three-dimensional structure more visible, for example, in case of retinal detachment. Subretinal tissue can be visualized and differentiated more precisely. CONCLUSIONS: The device is useful, in the teaching of residents and in experimental vitreoretinal surgery.

Animals↗
PubMed2001

[Electrical stimulation of the visual system. From empirical approach to visual prostheses].

The investigation of the influence of electrical stimulation on the visual system can be sub-divided into empirical, diagnostic and therapeutic phases of development. The first electrical stimulations of the visual system in animals dating back to the eighteenth century represent empirical approaches well before knowledge on the principles of bioelectrical nerve activity was available. Despite this lack of understanding, attempts were made at that time to treat blind people by electrical stimulation. More than 100 years later, with the advancement of technology and knowledge on nerve function, attempts were made to establish various methods of electrical stimulation for the diagnosis of different diseases of the visual system. For more than 30 years attempts to develop electrical devices have been made to by-pass defects of the visual system and to restore basic orientation. Presently nine different groups world-wide are focusing on retinal, optic or cortical implants. A short review on the historical use of electrical stimulation and new therapeutical attempts are given in this paper.

Action Potentials↗
PubMed1998

A dummy orbit for training in diagnostic procedures and laser surgery with enucleated eyes.

PURPOSE: A dummy orbit for enucleated eyes was developed for training residents in diagnostic and surgical procedures. METHODS: Porcine eyes were used to construct the model. The device is made of black anodized metal. The final prototype was tested for ease of use and optical quality. Principal elements are an adjustable eye support, a cylinder, and a removable ring. RESULTS: The dummy orbit and enucleated eye allow direct and indirect ophthalmoscopy; inspection with contact lenses, including gonioscopy; and retinal laser coagulation using contact lenses. Laser trabeculoplasty, argon laser trabeculotomy, Nd:YAG laser iridectomy, and Nd:YAG laser capsulectomy are possible, as well as training in tonometry and ultrasonography techniques. CONCLUSION: The dummy orbit is a valuable aid for teaching and training in diagnostic and laser surgery procedures with nondissected enucleated eyes.

Animals↗