Corneal measurement and control of corneal crosslinking
US11020608B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 28, 2017 |
| Grant date | Jun 1, 2021 |
| Priority date | — |
| Expiry date | Feb 4, 2039 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61N2005/0648
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Systems and methods for monitoring properties of the cornea and controlling the crosslinking treatment. The thickness of the cornea during crosslinking may be measured by using ultrasonic reflections to determine an anterior distance (D1′) between a reference location (37) on a device resting on the eye and an anterior surface (66) of the cornea and to determine a posterior distance (D3′) between a posterior surface (63) of the cornea and an element of the eye such as an anterior surface (72) of the lens of the eye. These distances are subtracted from a reference distance (D0) between the reference location and the element of the eye. The reference distance (D0) may be determined using ultrasonic reflections to determine the corresponding anterior and posterior distances and the thickness (D2) of the cornea prior to crosslinking. The speed of sound in the cornea during crosslinking may be derived using the thickness (D2′) and time of flight of ultrasound through the cornea. The position of the cornea relative to a reference location may be determined. In still other embodiments, location of a surface of demarcation (86) within the cornea formed as a result of crosslinking may be de…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.