Accurate, non-mechanical removal of the epithelium from essentially only the area of the cornea to be treated. In particular, an epithelium-ablative laser device irradiates the selected region of the epithelium with ablative laser energy, a spectroscopic system monitors the ablation and spectroscopically determines whether epithelium is being ablated, and a control system terminates the epithelium removal upon spectroscopic determination of a substantial absence of epithelium ablation.

Cyclohexanol is removed from aqueous solutions containing it and aromatic sulfonic acids by extraction with one or more cyclohexyl ethers liquid under extraction conditions and having the formula ##STR1## where R is alkyl of from 1 to 16 catbon atoms, cycloalkyl of from 5 to 8 carbon atoms, aralkyl of from 7 to 10 carbon atoms or phenyl, which may additionally have substituents which are inert under reaction conditions.

Cyclohexanol is removed from aqueous solutions containing it and aromatic sulfonic acid by extraction using as the extractant a mixture of (a) one or more liquid aliphatic, cyloaliphatic or aromatic hydrocarbons, halohydrocarbons or ethers which are inert under extraction conditions and (b) one or more phenols.

A shaft-mounted rotatable furnace vessel or converter is provided with bearing housings journaling its shafts that are adapted to be raised and lowered on jack mounts or stands of a pair of spaced-apart stationary support piers. A driven trunnion shaft of the vessel or converter is provided with a conventional separable part type of coupling connecting it to a motor drive mechanism. Each jack mount or stand has a wedge-shaped or inclined slide part carried by a guide member for endwise guided mo...

A device for removing an incorrectly inserted weft on a jet loom includes nozzles, a scissor locking device, and a suction device operated in response to signals from sensors sensing the position of the weft. The incorrectly inserted weft picking length is removed in the shape of an evolving loop in the direction towards the shed end side by a pull exerted on the whole subsequent picking length of the weft.

A method for stripping ammonia from a film of digested sludge including flowing alkaline liquid sludge as a film on a tower's interior wall and flowing an ammonia stripping gas past the film creating a vapor containing ammonia and stripping gas; then disengaging the liquid sludge from the vapor in a tower disengaging zone.

To reduce damage to surrounding tissue while fragmenting some tissue such as for example not damaging the capsular wall while removing the lens during cataract removal surgery or not damaging artery or vein walls during bypass surgery while freeing the artery or vein to be transplanted, an incision is made for the insertion of surface--a handpiece tip. The tiop is rotated and reciprocated ultrasonically at the same time so that tissue is fragmented by the combined motion of a fragmenting surface...

To reduce damage to surrounding tissue while fragmenting some tissue such as for example not damaging the capsular wall while removing the lens during cataract removal surgery or not damaging artery or vein walls during bypass surgery while freeing the artery or vein to be transplanted, an incision is made for the insertion of surface-discriminating, rotating, fragmenting handpiece. The surface-discriminating fragmenting handpiece fragments and permits aspiration of the tissue without damaging t...

The invention relates to an assembly for the removal of a stent from a body vessel without an operation being necessary to gain access to this stent. This assembly has for this purpose an expandable element, connected to a pulling device, the outer surface of which is covered with an adhesive medium and which, when the element is positioned inside the stent, is expanded and lies with its outer surface against the inner surface of the stent and thereby causes an attachment between this outer surf...

Effluent streams from photographic processes contain both silver and thiosulphate ions, and because of the formation of complex anions it is difficult to remove the silver. The silver may be removed using a cell (12) with a cathode (24) exposed to the effluent liquid, and an anode (25) separated from the liquid by a barrier (22) permeable at least to anions. Some silver sulphide is formed electrochemically at the cathode (24); at the anode (25) water is electrolysed and becomes acidic, so the co...