The invention relates to a medical instrument with an endoscope, in which a wire loop, gripping arms or the like are arranged in displaceable manner in the longitudinal direction of the endoscope, as well as with a telescopic periscope which is displaceable together with the wire loop electrode or the like and in which between a ring connected to the telescopic periscope and an axially displaceable slide, which, is connected to the wire loop or the like, are arranged first and second levers interconnected by means of a first joint so that the first lever is connected by means of a second joint to the slide, while the second lever is connected by means of a third joint to the ring, a connection between its end to the periscope and at its other end by a fourth joint being connected between the two joints of the second lever so that the ratio of the spacing of the fourth joint with respect to the first joint is selected so that there is a smaller periscope displacement than wire loop electrode displacement. In order to simplify construction and make handling easier, the invention proposes that the fourth joint of the second lever by arranged on the fixed ring and that the third joint be directly connected to the movable ring.
A thumb ring for an endoscopic instrument is rotatably mounted at an affixation site to be rotatable about an axis parallel to the instrument longitudinal axis. A thumb insertion aperture has a concave rest surface in the ring opposite the affixation site. The rest surface is substantially shaped like a cylinder segment of which the axis, as seen in the direction of thumb insertion, forms an acute angle with the ring axis.
A field-of-view switching and focusing system of a common-optical-path periscope, having an aspherical reflecting mirror system, a field-of-view driving system and a focus driving system. The field-of-view driving system and the focus driving system are located at two sides of the aspherical reflecting mirror system. The field-of-view driving system allows the aspherical reflecting mirror system to rotate, thereby, different curved faces of the aspherical reflecting mirror can reflect the incident light, so that the field of view can be switched. Further, by a linear movement of the aspherical reflecting mirror system driven along the optical path by the focus driving system, the focus fine adjustment is performed.
A surgical instrument assembly includes a surgical instrument having a proximal handle (16) for control by the surgeon, the handle being ergonomically configured and having surface depressions (17, 18, 19, 20) to accommodate thumb and finger tips. The handle extends no more than about 5 cm beyond the point of grip so that the surgeon can rotate his/her hand over the end of the handle in unrestricted movement while maintaining the grip between thumb and middle finger. Improvements in the support means for the endoscope telescope and instrument shaft, as well as in the lighting system of the assembly are also disclosed, together with improvements in the mechanisms for moving a distal end of the instrument in the operating zone within a patient.
The present invention relates to an improved resectoscope which enhances versatile and ergonomic operating and handling performance thereof. The resectoscope includes a plurality of thumb engageable portion's a central block assembly used to displace an electrode from a sheath of the resectoscope. Also disclosed is a drip guard assembly which coacts with the outer sheath and is releasably retained in any one of a plurality of positions on the outer sheath so as to accommodate different operations and patients. Additionally, provision is made for improved electrode guiding and stabilizing structures which enhance stability of the electrode assembly by facilitating easy and correct insertion of the electrode without requiring disassembly of resectoscope components.
