Treatment apparatus for surgical correction of defective eyesight, method of generating control data therefore, and method for surgical correction of defective eyesight
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
A61B-018/18
A61F-009/008
A61B-034/10
출원번호
US-0184363
(2016-06-16)
등록번호
US-10098784
(2018-10-16)
발명자
/ 주소
Wiechmann, Martin
Bergt, Michael
Bischoff, Mark
Sticker, Markus
Stobrawa, Gregor
출원인 / 주소
Carl Zeiss Meditec AG
대리인 / 주소
Patterson Thuente Pedersen, P.A.
인용정보
피인용 횟수 :
0인용 특허 :
26
초록▼
A treatment method and apparatus for surgical correction of defective-eyesight in an eye of a patient, wherein a laser device is controlled by a control device, said laser device separating corneal tissue by irradiation of laser radiation to isolate a volume located within a cornea, wherein the cont
A treatment method and apparatus for surgical correction of defective-eyesight in an eye of a patient, wherein a laser device is controlled by a control device, said laser device separating corneal tissue by irradiation of laser radiation to isolate a volume located within a cornea, wherein the control device controls the laser device to focus the laser radiation, by providing target points located within the cornea, into the cornea, wherein the control device, when providing the target points, allows for focus position errors which lead to a deviation between the predetermined position and the actual position of the target points when focusing the laser radiation, by pre-offsets depending on the positions of the respective target points to compensate for said focus position errors.
대표청구항▼
1. A system, comprising: a planning device for determining control data for a treatment apparatus for surgical correction of defective eyesight in an eye of a patient and a measurement device connected to the planning device, whereinthe measurement device generates measurement data of parameters of
1. A system, comprising: a planning device for determining control data for a treatment apparatus for surgical correction of defective eyesight in an eye of a patient and a measurement device connected to the planning device, whereinthe measurement device generates measurement data of parameters of the eye and defective-eyesight data of the defective eyesight of the eye and supplies the data to the planning device,the planning device generates the control data for the treatment apparatus which separates eye tissue by focusing pulsed laser radiation to target points within the eye,wherein the planning device defines a boundary surface within eye tissue by using the measurement data and the defective-eyesight data, andgenerates for said boundary surface control data to control the treatment apparatus, which the control data defines as a three-dimensional pattern of the target points in the eye, which are located in the boundary surface and are arranged such that the boundary surface is obtained as a cut surface when the pulsed laser radiation is irradiated according to the control data;wherein the planning device and the measurement device are combined in one system; andwherein the control data specify target points to which pulses of the pulsed laser radiation shall be emitted and wherein the treatment apparatus shifts a focus of the laser radiation along a path extending over the target points and emits pulses of the pulsed laser radiation along the path to the target points and also to intermediate points at locations which are located between the target points wherein the target points represent a subset of all points to which the pulses of the pulsed laser radiation are applied, wherein the intermediate points of a laser application are not specified target points of the control data. 2. The system of claim 1, wherein the planning device defines a volume by using the measurement data and the deflective-eyesight data which volume is located within a cornea of the eye and removal of the volume from the cornea causes a desired correction of defective eyesight, and wherein the planning device determines the boundary surface to confine the defined volume within the cornea and make the defined volume removable. 3. The system of claim 1, further comprising a data link or a data carrier that transmits the control data from the planning device to the treatment apparatus. 4. The system of claim 1, further comprising the treatment apparatus, wherein the measurement device is directly connected to the treatment apparatus or the planning device is an element of the treatment apparatus. 5. The system of claim 1, further comprising a display device that visually represents data of the control data and an input device for subsequently modifying the control data. 6. The system of claim 1, wherein the defective-eyesight data comprise a refractive power BBR of spectacles suitable for correction of the defective eyesight, as well as a distance dHS at which the spectacles having the refractive power BBR should be located anterior of a corneal vertex to achieve the desired correction of defective eyesight by use of the spectacles. 7. The system of claim 6, wherein the planning device defines the volume such that a corneal front surface of the eye assumes a radius of curvature Rcv* after removal of the volume, the radius satisfying the following equation: Rcv*=1/((1/Rcv)+BBR/((nc−1)(1−dHS·BBR)))+F, wherein Rcv is a radius of curvature of the corneal front surface prior to removal of the volume, nc is a refractive power of tissue of the cornea and F is a factor, wherein F=(1−1/nc)·(dc*−dc) holds true, wherein dc or dc* is a thickness of the cornea before or after removal of the volume, respectively, and wherein the planning module computes the radius Rcv* in an iterative manner by deriving a quantity (dc*−dc) from a difference (Rcv*−Rcv) during each iteration step, and by applying a calculated change in thickness to calculate Rcv* in the next iteration step. 8. The system of claim 1, wherein the treatment apparatus emits the pulses of the pulsed laser radiation to the eye at a frequency fp and the control data defines the pattern of the target points such that the target points occur along the path at a frequency fs which is smaller than the frequency fp. 9. The system of claim 4, wherein the planning device writes a file comprising the control data and wherein the planning device controls the treatment apparatus to fully automatically generate the cut surface. 10. The system of claim 1, wherein the planning device defines the boundary surface as a free-form surface. 11. The system of claim 1, wherein the three-dimensional pattern comprises a path curve in form of a spiral. 12. An apparatus, comprising: a planning device adapted to generate control data for a laser based eye treatment device and a measurement device connected to the planning device, whereinthe measurement device is adapted to measure an eye of a patient and to generate eye data relating to optical parameters of the eye and to defective eyesight of the eye and to supply the eye data to the planning device,the planning device is adapted to define a cut surface based on the eye data, which cut surface is located within eye tissue and assists correction to the defective eyesight,wherein the planning device is adapted to define a three-dimensional pattern of target points in the eye to which pulsed laser radiation is to be focused for separating eye tissue along the cut surface,wherein the planning device is further adapted to generate control data which specifies the three-dimensional pattern of target points in the eye and is adapted to control laser operation of a treatment device; andwherein the control data specify target points to which pulses of the pulsed laser radiation shall be emitted and wherein the treatment apparatus shifts a focus of the laser radiation along a path extending over the target points and emits pulses of the pulsed laser radiation along the path to the target points and also to intermediate points at locations which are located between the target points wherein the target points represent a subset of all points to which the pulses of the pulsed laser radiation are applied, wherein the intermediate points of a laser application are not specified target points of the control data. 13. The apparatus of claim 12, wherein the planning device is adapted to define a volume based on the eye data the volume being located within a cornea of the eye and wherein removal of the volume from the cornea causes a desired correction of defective eyesight, and wherein the planning device is adapted to define the cut surface to confine the volume within the cornea and make the volume removable. 14. The apparatus of claim 12 further comprising the treatment device, wherein the measurement device is directly connected to the treatment device or the planning device is an element of the treatment device. 15. A system, comprising in combination: a planning device, a laser based eye treatment device and a measurement device which are all interconnected with each other, whereinthe measurement device is adapted to measure an eye of a patient and to generate eye data relating to optical parameters of the eye and to defective eyesight of the eye and to supply the eye data to the planning device,the laser based eye treatment device is adapted to separate eye tissue within the eye by focusing pulsed laser radiation to target points within the eye, andthe planning device is adapted to define a cut surface based on the eye data, the cut surface being located within the eye tissue and assisting correction of the defective eyesight, and to define a three-dimensional pattern for the target points in the eye and to compile control data, wherein the three-dimensional pattern is located in the cut surface for separating eye tissue along the cut surface when operating the treatment device according to the control data andwherein the control data specify target points to which pulses of the pulsed laser radiation shall be emitted and wherein the treatment device is adapted to shift a focus of the laser radiation along a path extending over the target points and emits pulses of the pulsed laser radiation along the path also to intermediate points at locations which are located between the target points wherein the target points represent a subset of all points to which the pulses of the pulsed laser radiation are applied, wherein the intermediate points of a laser application are not specified target points of the control data. 16. The system of claim 15, wherein the treatment device is adapted to emit the pulses of the pulsed laser radiation to the eye at a frequency fp and the control data defines the pattern of the target points such that the target points occur along the path at a frequency fs which is smaller than the frequency fp. 17. The system of claim 15, wherein the planning device writes a file comprising the control data and controls the treatment device to fully automatically generate the cut surface. 18. The system of claim 1, wherein the measurement device comprises an OCT. 19. The apparatus of claim 12, wherein the measurement device comprises an OCT. 20. The system of claim 15, wherein the measurement device comprises an OCT.
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