A device which is to be used with a tonometer for facilitating the operation thereof. The device includes a pair of retractors for respectively retracting the upper and lower eyelids of an eye which is to be examined. A holding unit holds and carries the pair of retractors in a position where they conveniently pull the eyelids apart from each other with a regulated force. A supporting device is provided for supporting a tonometer in a convenient position of operation while the eyelids are held back by the retractors.
A retractor of human or animal tissue comprises two arms with a spoon at one end, the other end being connected to a housing. The housing contains a spring which produces a force which spreads the two arms apart. The foot is connected to the housing by means of the spindle and a ball-joint. The lower face of the foot has a double-face adhesive.
The retractor device for human or animal tissues, and more particularly for retracting upper and lower eyelids to expose the underlying eyeball for surgery, comprises a pair of retracting arms each having a spoon articulatingly mounted at one first end of said retracting arm to pivot about an axe that is in substantially perpendicular relationship with said retracting arm. A retracting means joins the second ends of the arms in a cooperating relationship and biases the first ends of said retracting arms into retracted positions. Each spoon has a first curvature adapted to the shape of an eyeball and a second curvature adapted to the shape of an eyelid.
A tonometer divides internally incident light at the applanating surface of a prism so that light incident in the applanation area is refracted into the eye and light incident around the applanation area is internally reflected within the prism. Infrared light is preferred for this, and the amount of the reflected light is detected to provide an objective indication of the size of the area that is applanated. This allows intraocular pressure to be determined objectively from the force difference applied to the prism to change the applanation area between reference and measurement sizes, both of which are reliably determined from previous calibration for the amount of the reflected light. Many variations are possible in applying a variable force to the applanating prism and on operating the instrument with the preferred microprocessor, which can also store, display, and manipulate relevant patient data.
The present invention relates to a single-use disposable eyelid speculum and scleral depressor. The eyelid speculum comprises an elongated curved arm formed from an elastic single piece element. The elongated curved arm terminates in integrally formed spoons, each spoon being configured to engage an eyelid. The eyelid speculum and scleral depressor may be provided as a kit in either separate or combined packing in a sterilized condition. The kit is intended to be disposable after a single use.
The present invention describes apparatus and methods for long-term, repeatable measurement of pressure in vessels by measuring distortion signatures of the external surfaces of a vessel through calibration against a known and verifiable reference standard. It is particularly useful for measuring intraocular pressure, pressure in blood vessels and other physiological pressures. It is also adaptable for measuring pressure changes in virtually any vessel whose external surface is deformable such that pressure changes are transduced to the external surface of the confining vessel, as exemplified by process piping.
