IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0318825
(2002-12-13)
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발명자
/ 주소 |
- Olivera, Argelio M.
- Polski, Stanley C.
|
출원인 / 주소 |
|
인용정보 |
피인용 횟수 :
6 인용 특허 :
6 |
초록
▼
Apparatus and methods for use in ophthalmic surgery in which a container for fluid is connected to a line through which fluid flows to a surgical handpiece for the irrigation of a patient's eye are provided. A sensor emits a magnetic field and a detector causes another magnetic field to be generated
Apparatus and methods for use in ophthalmic surgery in which a container for fluid is connected to a line through which fluid flows to a surgical handpiece for the irrigation of a patient's eye are provided. A sensor emits a magnetic field and a detector causes another magnetic field to be generated. The interaction of the two magnetic fields causes a pulse to be generated. Based on the timing of the generated pulse, the apparatus or method determines the absolute position of the support coupled to the container and adjusts the height of the support. Circuitry is also provided to prevent changes in height of the support by preventing supply of drive currents and by applying a hold current or by generating an electro motive force.
대표청구항
▼
1. An apparatus for use in surgery in which a container for fluid is connected to a line through which fluid flows to a surgical handpiece for the irrigation of a patient's eye, the apparatus comprising:a) a base; b) a support extending from the base and coupled to the container from which fluid is
1. An apparatus for use in surgery in which a container for fluid is connected to a line through which fluid flows to a surgical handpiece for the irrigation of a patient's eye, the apparatus comprising:a) a base; b) a support extending from the base and coupled to the container from which fluid is supplied to the surgical handpiece; c) an encoder arranged to determine the absolute position of the support, the encoder including a sensor and a detector, the absolute position being the distance between the encoder and the detector along the support; and d) a controller arranged to adjust the height of the support based on the absolute position determined. 2. The apparatus of claim 1 further comprising a motor arranged to move the support along an axis.3. The apparatus of claim 2 wherein the controller is arranged to cause the motor to move the support.4. The apparatus of claim 1 wherein the encoder comprises:a) a sensor coupled to a portion of the support and arranged to emit a first magnetic field; and b) a detector arranged to emit a second magnetic field and to detect an indication of an interaction of the first and second magnetic fields. 5. The apparatus of claim 4 wherein the controller is arranged to determine the distance between the detector and the sensor based on a determination of the time between emission of the second magnetic field and detection of the indication of the interaction of the first and second magnetic fields.6. The apparatus of claim 5 wherein the detector comprises a signal conditioner and a waveguide.7. The apparatus of claim 6 wherein the signal conditioner generates a signal and the controller determines the height of the support based on a pulse width of the signal.8. The apparatus of claim 7 wherein the signal conditioner causes current to flow through the waveguide.9. The apparatus of claim 6 wherein the sensor comprises a magnetic element substantially surrounding the waveguide.10. The apparatus of claim 4 wherein the detector is arranged to supply a current, the current causing the second magnetic field to be emitted.11. The apparatus of claim 10 wherein the detector is arranged to detect a pulse emitted from the interaction of the first magnetic field and the second magnetic field.12. The apparatus of claim 11 wherein the controller is arranged to determine the position of the sensor based on a determination of the time between emission of the second magnetic field and detection of the pulse.13. The apparatus of claim 11 wherein the controller is arranged to determine the height of the support based on a determination of the time between emission of the second magnetic field and detection of the pulse.14. The apparatus of claim 11 further comprising a carrier coupled to the sensor and arranged to travel along a portion of the support.15. The apparatus of claim 14 further comprising a motor arranged to move the carrier along the portion of the support.16. The apparatus of claim 15 wherein the controller is arranged to cause the motor to move the carrier in a desired direction for a desired distance.17. The apparatus of claim 1 further comprising circuitry arranged to prevent movement of the support and wherein the controller is arranged to energize the circuitry based on the absolute position determined.18. The apparatus of claim 1, wherein the absolute position is defined relative to a distance between two points on the support.19. The apparatus of claim 18, wherein a first point is fixed, and a second point is variable.20. The apparatus of claim 18, wherein the absolute position is determined without determining a previous location of the support.21. The apparatus of claim 1, the detector being fixed in position relative to the base.22. The apparatus of claim 1, the sensor being fixed in position relative to the support.23. The apparatus of claim 1, the absolute position being determined without determining a previous location of the pole.24. An apparatus for use in ophthalmic surgery in which a container for fluid is connected to a line through which fluid flows to a surgical handpiece for the irrigation of a patient's eye, the apparatus comprising:a) a support coupled to the container from which fluid is supplied to the surgical handpiece; b) a motor arranged to generate an electro motive force; and c) circuitry arranged to prevent vertical movement of the support based on the electro motive force generated, the circuitry causing at least one winding of the motor to be shorted. 25. An apparatus for use in ophthalmic surgery in which a container for fluid is connected to a line through which fluid flows to a surgical handpiece for the irrigation of a patient's eye, the apparatus comprising:a) a support coupled to the container from which fluid is supplied to the surgical handpiece; b) a motor arranged to generate an electro motive force; and c) circuitry comprising a relay and drivers that supply power to the motor, the relay coupled to the drivers, the circuitry arranged to prevent vertical movement of the support based on the electro motive force generated. 26. The apparatus of claim 25 wherein the relay has an active state and an inactive state.27. The apparatus of claim 26 wherein the relay, in an active state, allows power to be supplied to the motor and, in an inactive state, prevents power from being supplied to the motor.28. The apparatus of claim 26 wherein the relay changes state based on whether power is being supplied to the relay.29. An apparatus for use in ophthalmic surgery in which a container for fluid is connected to a line through which fluid flows to a surgical handpiece for the irrigation of a patient's eye, the apparatus comprising:a) a pole; b) a magnet for emitting a first magnetic field; c) a carrier housing the magnet and coupled to a portion of the support; d) a waveguide proximate the pole, the waveguide including magnetostrictive strain material; e) a signal conditioner arranged to cause current to flow through the waveguide to emit a second magnetic field and further arranged to detect a pulse generated from an interaction of the first magnetic field and a second magnetic field; f) a motor having windings and arranged to adjust the position of the pole and the carrier; g) a control board arranged to determine the height of the pole based on a time interval between the flow of current to the detection of the pulse by the signal conditioner and further arranged to energize the motor to adjust the height of the pole; h) transistor, drivers arranged to supply drive currents to the windings of the motor; and i) transistor switches arranged to deactivate the drivers and to supply a current to one of the windings to prevent movement of the motor. 30. A method for use in ophthalmic surgery in which a container for fluid is connected to a line through which fluid flows to a surgical handpiece for the irrigation of a patient's eye, the method comprising the steps of:a) attaching to a support the container from which fluid is supplied to the surgical handpiece; b) detecting the absolute position of the support with reference to a base, the step of detecting the absolute position comprising: i) emitting, a first magnetic field proximate the support; and ii) emitting a second magnetic field along a waveguide to interact with the first magnetic field; and c) adjusting the height of the support based on the absolute position detected. 31. The method of claim 30 further comprising generating a pulse in response to the interaction of the first and second magnetic fields.32. The method of claim 31 further comprising measuring an amount of time the pulse takes to reach a predetermined location.33. The method of claim 32 wherein the step of detecting the absolute position of the support is based on a time interval between when the second magnetic field is emitted to when the pulse reaches a predetermined location.34. The method of claim 33 further comprising preventing change of position of the support based on the absolute position detected.35. A method for use in ophthalmic surgery in which a container for fluid is connected to a line through which fluid flows to a surgical handpiece for the irrigation of a patient's eye, the method comprising the steps ofa) attaching to a support the container from which fluid is supplied to the surgical handpiece; b) generating an electro motive force; c) preventing chance of height of the support based on the electro motive force generated; d) detecting a change in power and generating the electro motive force based on the chance in power detected; and e) shorting at least one winding of the motor. 36. An apparatus for use in surgery in which a container for fluid is connected to a line through which fluid flows to a surgical handpiece for the irrigation of a patient's eye, the apparatus comprising:a) a base; b) a support extending from the base and coupled ) to the container from which fluid is supplied to the surgical handpiece; c) an encoder arranged to determine the absolute position of the support, wherein the encoder comprises a sensor coupled to a portion of the support and arranged to emit a first magnetic field; and a detector arranged to emit a second magnetic field and to detect an indication of an interaction of the first and second magnetic fields; and d) a controller arranged to adjust the height of the support based on the absolute position determined. 37. An apparatus for use in ophthalmic surgery in which a container for fluid is connected to a line through which fluid flows to a surgical handpiece for the irrigation of a patient's eye, the apparatus comprising:a) a means for supporting the container from which fluid is supplied to the surgical handpiece; b) a means for determining the absolute position of the means for supporting the container with reference to a base, wherein the means for determining the absolute position comprises: a means for emitting a first magnetic field proximate the support means, and a means for emitting a second magnetic field to interact with the first magnetic field; and c) a means for adjusting the height of the support based on the absolute position determined. 38. An apparatus for use in ophthalmic surgery in which a container for fluid is connected to a line through which fluid flows to a surgical handpiece for the irrigation of a patient's eye, the apparatus comprising:a) a support coupled to the container from which fluid is supplied to the surgical handpiece; b) a motor arranged to generate an electro motive force; and c) circuitry arranged to prevent vertical movement of the support based on the electro motive force generated, wherein the circuitry causes at least one winding of the motor to be shorted. 39. An apparatus for use in ophthalmic surgery in which a container for fluid is connected to a line through which fluid flows to a surgical handpiece for the irrigation of a patient's eye, the apparatus comprising:a) a support coupled to the container from which fluid is supplied to the surgical handpiece; b) a motor arranged to generate an electro motive force; and c) circuitry arranged to prevent vertical movement of the support based on the electro motive force generated, wherein the circuitry comprises a relay and drivers that supply power to the motor, the relay coupled to the drivers. 40. A method for use in ophthalmic surgery in which a container for fluid is connected to a line through which fluid flows to a surgical handpiece for the irrigation of a patient's eye, the method comprising the steps of:a) attaching to a support the container from which fluid is supplied to the surgical handpiece; b) detecting the absolute position of the support with reference to a base, wherein the step of detecting the absolute position comprises: emitting, a first magnetic field proximate the support, and emitting a second magnetic field along a waveguide to interact with the first magnetic field; and c) adjusting the height of the support based on the absolute position detected.
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