Geometrical instruments – Straight-line light ray type – Level
Patent
1996-05-29
1998-11-17
Bennett, G. Bradley
Geometrical instruments
Straight-line light ray type
Level
33DIG21, 33381, 33390, 362118, 362186, 362259, F21V 800
Patent
active
058360816
ABSTRACT:
A light beam leveling device and method utilizable particularly in hemodynamic cardiac monitoring of patients in which a pressure transducer is required to be leveled with the tip of a catheter placed at the heart of a patient. The light beam device, preferably a laser, is placed at the transducer and is raised and lowered therewith relative to a reference point on the patient corresponding to the level of the tip of the catheter. When the laser beam is projected horizontally as established with associated bubble level means and is directed so as to cause a reflection directly at the reference point, the transducer is assured thereby to be at the level of the catheter tip in the patient. A transparent cylindrical bar at the tip of the laser through which the laser beam passes causes a line of light to be projected at right angles to the orientation of the bar. An associated protractor permits selection of the desired angle of orientation of the line of light projected from the laser. In another embodiment a unit of two side-by-side lasers with associated line forming bars can provide lines of light selectively angularly oriented with reference to each other.
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Bennett G. Bradley
Schroeder Charles F.
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