HOMESurgical InstrumentsINNOVATIONSM-2050 Scleral depressor for premature infant, Morizane
Yuki Morizane, M.D., has designed a new scleral depressor for premature infants.
In the management of retinopathy of prematurity, it is essential to have the precise evaluation of the stage of disease process of developing from one stage or state to another and the treatment of complete and timely peripheral retinal photocoagulation.
Various scleral depressors have been introduced to the market so far, however, no product is satisfying simultaneous control of both rotation and depression of the eyeball.
Insufficient rotation and depression of the eyeball given by those depressors result in an inadequate view of the peripheral fundus, and excessive rotation and depression may cause severe deformation of the eyeball, undesirable elevation of the intraocular pressure, and bradycardia due to vagal reflex.
The newly developed depressor is a modification of M-112 retractor for premature infants of which tip is a triangular flat plate (sides of a triangle are 7mm in length) on the end of a 50mm right-angled shaft.
The plate has a tiny column-shaped-projection with a diameter of 0.6mm and a height of 4mm to depress the sclera.
The depressor has three variations in the position of projection; at 1mm, 2mm and 3mm from the edge of the plate, based of the distance from the peripheral fundus to the posterior end of the conjunctival sac of premature infants at 30 to 40 weeks' gestation.
At the point of use, physicians select an appropriate depressor to adapt to the size of the eyeball and the intended use. Because the tiny projection depresses the sclera moderately by itself, physicians can obtain an adequate view of the peripheral fundus by just rotating the eyeball to the desired position. Physicians can also perform peripheral retinal photocoagulation feasibly.
Diagram showing simultaneous attainment of rotation and depression of the eyeball. The arrow indicates the location where the projection depresses the sclera.
M-2050-1 Scleral depressor, for premature infants with a projection at 1mm, MORIZANE
M-2050-2 Scleral depressor, for premature infants with a projection at 2mm, MORIZANE
M-2050-3 Scleral depressor, for premature infants with a projection at 3mm, MORIZANE
Location of the projection. Distances between the edge of the triangular plate and the projection are 1 mm, 2 mm and 3 mm. Scale bar, 5 mm.
Y Morizane,et al
A new scleral depressor for premature infants.
Retina. 2005 Dec;25(8):1118
Name:Yuki Morizane,M.D.
AFFILIATIONS:
Department of Ophthalmology, Okayama University Graduate School of Medicine, Okayama, JAPAN
