Neodymium-YAG laser, for ophthalmological treatment

US4652092A · kind A · utility

Assignee

• Meditec Reinhardt Thyzel GmbH · DE

Inventors

• Eckhard Schroder · Eckental, DE
• Reinhardt Thyzel · Heroldsberg, DE

Key dates

• Filing date: Jun 27, 1985
• Grant date: Mar 24, 1987
• Expiry date: Jun 27, 2005

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61F2009/00863
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

A neodymium-YAG laser is described, which can be used for ophthalmological treatment. The laser has a laser beam guide, in which the laser beam is guided as a parallel beam over a long distance and following the latter is focused onto the operating plane by a focusing optics. According to the invention, an afocal system with a plurality of optical components is placed in the parallel optical path at a distance of more than approximately 50 cm from the focusing optics. This afocal optical system substantially does not influence the beam in its normal position. As a result of an optical component in the afocal system, which is displaceable, it is possible to vary the angle of the marginal beams of the focused beam. According to the preferred embodiment, the afocal system has two single lenses, whereof one has a positive and the other a negative refractive power and one is displaceable.