Abstract: A seal for use in a trocar, particularly for a trocar for eye surgery, having a seal element, with a seal opening, and an instrument opening. The instrument opening extends along a center axis on both sides of the seal element all the way through the seal. The seal also has a clamp element for establishing a form-fit connection to an instrument that is inserted at least partially into the instrument opening and through the seal opening.

Abstract: A seal for use in a trocar, particularly for a trocar for eye surgery, having a seal element, with a seal opening, and an instrument opening. The instrument opening extends along a centre axis on both sides of the seal element all the way through the seal. The seal also has a clamp element for establishing a form-fit connection to an instrument that is inserted at least partially into the instrument opening and through the seal opening.

Abstract: The present invention provides a pilot tube attachment that can be connected by coupling to a pilot tube inserted into an eye. The pilot tube attachment has a centre axis. The pilot tube attachment comprises an instrument guide and a clamp unit. The clamp unit comprises at least two catch elements which are arranged symmetrically with respect to the centre axis and which can be actuated by respectively associated pressure tabs via a transition leading into the instrument guide.

Abstract: A NMR measurement apparatus comprising a cryostat (10) in which a superconducting magnet coil system (9) is disposed in a first tank (8) having cryogenic liquid and surrounded by additional cooling devices such as radiation shields (5, 6), superinsulating foil (7) and, if appropriate, a second tank (3) having cryogenic liquid, is characterized by a pulse tube cooler (11) cryotechnically connected to at least one of the additional cooling devices in a good heat conducting fashion with this cooling device being mechanically attached in the cryostat (10) in such a fashion that vibrational and cryotechnical decoupling is achieved between the cooling device and the first tank (8) having the cryogenic liquid and, in particular, between the cooling device and the superconducting magnet coil system (9).