Abstract: A resistance device for providing resistance. The device includes a flexible pulling element, a resilient arrangement and a transmission. The resilient arrangement has a first portion and a second portion. The second portion is resiliently movable relative to the first portion. The transmission connects the flexible pulling element to the resilient arrangement such that pulling upon the flexible pulling element moves the second portion relative to the first portion, and upon release of the flexible pulling element the resilient arrangement retracts the flexible pulling element. The transmission is a reduction arrangement such that pulling the flexible pulling element a distance moves the second portion, relative to the first portion, no more than a proportion of the distance. The proportion is no more than half.

Abstract: A resistance device for providing resistance. The device includes a flexible pulling element, a resilient arrangement and a transmission. The resilient arrangement has a first portion and a second portion. The second portion is resiliently movable relative to the first portion. The transmission connects the flexible pulling element to the resilient arrangement such that pulling upon the flexible pulling element moves the second portion relative to the first portion, and upon release of the flexible pulling element the resilient arrangement retracts the flexible pulling element. The transmission is a reduction arrangement such that pulling the flexible pulling element a distance moves the second portion, relative to the first portion, no more than a proportion of the distance. The proportion is no more than half.

Abstract: The present invention relates to a support arm apparatus for supporting a medical instrument including: a support arm (1) having a first end, a second end, and a chamber extending from the first end to the second end, the support arm defining a longitudinal axis (x); a support part (2) arranged at the second end of the support arm (1); a ball joint (3) arranged at the first end of the support arm (1) and including a ball head (4) and a ball seat (5); a connecting component (6) connected to the ball head (4) and configured for connection with a medical instrument (10); and a locking device (30) including an operation element (11) and a locking element (12) movably arranged in the chamber and operable by the operation element in a direction in which the ball head is locked by the locking element. The support arm apparatus enables the medical instrument to be flexibly adjusted in position and orientation.

Abstract: A resistance device for providing resistance. The device includes a flexible pulling element, a resilient arrangement and a transmission. The resilient arrangement has a first portion and a second portion. The second portion is resiliently movable relative to the first portion. The transmission connects the flexible pulling element to the resilient arrangement such that pulling upon the flexible pulling element moves the second portion relative to the first portion, and upon release of the flexible pulling element the resilient arrangement retracts the flexible pulling element. The transmission is a reduction arrangement such that pulling the flexible pulling element a distance moves the second portion, relative to the first portion, not more than a proportion of the distance. The proportion is not more than half.