A TUNNELED hemispherical muscle cone implant and the stages in its development are described. This implant is covered completely by conjunctival tissue, thereby overcoming difficulties encountered with partially covered types. It is so designed that movement is transmitted quickly and adequately to the prosthetic eye, although there is no direct contact between the implant and the prosthesis.
DEVELOPMENT OF THE MUSCLE CONE IMPLANT
—The first of the series of muscle cone implants1 described here was used originally in April 1946. It was a variation of the basic integrated type devised by Cutler.2 The differences were in the mechanical principles and the surgical technics involved. The implant was designed to distribute the work of support and rotation to larger areas of the rectus muscles than is possible with Cutler's implant. It (fig. 1 A) was 17 mm. in lateral diameter and 13 mm. in its anteroposterior dimension. A
ALLEN JH, ALLEN L. A BURIED MUSCLE CONE IMPLANTI. Development of a Tunneled Hemispherical Type. Arch Ophthalmol. 1950;43(5):879-890. doi:10.1001/archopht.1950.00910010894013