This disclosure is directed to improved opthalmological surgical procedures on the human eyeball characterized by initially utilizing ultra-pure hyaluronic acid in the form of a solution containing the sodium salt thereof, in a sufficient concentration thereof to protect delicate eye tissue and cells, e.g., 0.5 to 1.0 wt. % and higher, and thereafter, significantly diluting the concentration thereof in the aqueous media (natural and/or synthetic) within the anterior segment of the eye viz, in si...

Indicator means for showing that a surgical material or appliance has been sterilized by steam and formaldehyde vapour, the indicator means comprising a carrier for a sulphite to react with the formaldehyde to produce an alkali, and an indicator for the alkali having a change point on the alkaline side of neutrality.

Binding assay methods involving determining the presence of analytes in samples through enzymatic formation of detectable substances in amounts related to the amount of analyte present in the sample and monitoring for the presence of the substances in distinct phases. Methods according to the invention include use of labelled materials which associate with the analyte to be determined or compete with the analyte for association with an added binder. The labelled materials employed include label ...

A method of validating a procedure allows several processes to be involved in the validation of a single event. The method involves defining relationships between FSMs which describe the entities, selecting the processes which fulfill certain criteria, and processing the event in all of the selected processes.

The technique of separating a tagged bound material from the same unbound material in immunoassay procedures is improved by utilizing a clathrate sorbent to carry out the separation. A clathrate sorbent, for example, comprises a mixture of hydrate zinc sulfate and sodium hydroxide which form an inclusion compound with charcoal powder. Charcoal powder has also been combined to form a clathrate sorbent with salts of other metals which produce a gelatinous substance with alkaline hydroxides; e.g., ...

A method for stereotactic surgical procedure including securing to a predetermined region of anatomy of a patient, at least two stereotaxy frame attachment device. Tomographically scanning the predetermined region to generate scanning data relating to internal and external surfaces of the anatomical region including the frame attachment device and inputting into a data storage device the scanning data.

A searching procedure, particularly for searching on the Internet, using a search engine associated with a database and comprising submitting a request string comprising a locator (or URL) for the search engine and a search string including at least one search term. This will be an invalid address so an error signal is generated, and the generation thereof is monitored and used to trigger parsing of the request into the locator and the search string. The search string is then submitted to the se...

A method of occluding a vessel including: cinching the vessel with a ligature comprising a flexible elongate base structure having a longitudinal axis, a needle end, and a second end, a collar for receiving a needle and affixed elongate base structure, positioned on the second end, and a node for interacting with the collar, the node positioned on the elongate base structure, between the needle and second ends, transverse to the longitudinal axis and having a proximal and a distal edge with resp...

A device and procedures for endodontic therapy. An elongated flexible tubular member having a plurality of axially directed orifices formed in the distal end thereof has the proximal end thereof adapted to be connected to a source of supply of liquid. The liquid may be chemically active against necrotic tissue such as a solution of sodium hypochlorite. The distal end of the device is inserted into a root-pulp channel during a root canal procedure and liquid is delivered laterally against the wal...

Large diameter storage tanks are constructed from strip metal wound in a helical path in which the tank is built upwardly. The strip is fed to a support assembly arranged circularly on a base, and the upper edge of the strip that is fed to the support assembly is aligned with the lower edge of the helical turn immediately thereabove so that the edges are spaced apart in a vertical plane from each other and then butt welded together. The strip is vertically adjusted to maintain a predetermined sp...