US20070056596A1 - Pulse manipulation for controlling a phacoemulsification surgical system - Google Patents
Pulse manipulation for controlling a phacoemulsification surgical system Download PDFInfo
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- US20070056596A1 US20070056596A1 US11/216,475 US21647505A US2007056596A1 US 20070056596 A1 US20070056596 A1 US 20070056596A1 US 21647505 A US21647505 A US 21647505A US 2007056596 A1 US2007056596 A1 US 2007056596A1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F9/00—Methods or devices for treatment of the eyes; Devices for putting-in contact lenses; Devices to correct squinting; Apparatus to guide the blind; Protective devices for the eyes, carried on the body or in the hand
- A61F9/007—Methods or devices for eye surgery
- A61F9/00736—Instruments for removal of intra-ocular material or intra-ocular injection, e.g. cataract instruments
- A61F9/00745—Instruments for removal of intra-ocular material or intra-ocular injection, e.g. cataract instruments using mechanical vibrations, e.g. ultrasonic
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
- B06B1/0207—Driving circuits
- B06B1/0215—Driving circuits for generating pulses, e.g. bursts of oscillations, envelopes
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B2017/00017—Electrical control of surgical instruments
- A61B2017/00137—Details of operation mode
- A61B2017/00154—Details of operation mode pulsed
- A61B2017/00159—Pulse shapes
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B2017/00017—Electrical control of surgical instruments
- A61B2017/00137—Details of operation mode
- A61B2017/00154—Details of operation mode pulsed
- A61B2017/00172—Pulse trains, bursts, intermittent continuous operation
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B2017/00017—Electrical control of surgical instruments
- A61B2017/00137—Details of operation mode
- A61B2017/00154—Details of operation mode pulsed
- A61B2017/00172—Pulse trains, bursts, intermittent continuous operation
- A61B2017/00176—Two pulses, e.g. second pulse having an effect different from the first one
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B2017/00017—Electrical control of surgical instruments
- A61B2017/00137—Details of operation mode
- A61B2017/00154—Details of operation mode pulsed
- A61B2017/00181—Means for setting or varying the pulse energy
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B2017/00973—Surgical instruments, devices or methods, e.g. tourniquets pedal-operated
- A61B2017/00977—Surgical instruments, devices or methods, e.g. tourniquets pedal-operated the depression depth determining the power rate
Definitions
- the present invention relates generally to the field of ophthalmic surgery and, more particularly, to a method of manipulating the shapes, sequences and durations of pulses of ultrasonic energy generated by an ultrasound handpiece of a phacoemulsification surgical system.
- the human eye functions to provide vision by transmitting light through a clear outer portion called the cornea, and focusing the image by way of a lens onto a retina.
- the quality of the focused image depends on many factors including the size and shape of the eye, and the transparency of the cornea and lens.
- vision deteriorates because of the diminished light that can be transmitted to the retina.
- This deficiency is medically known as a cataract.
- An accepted treatment for cataracts is to surgically remove the cataract and replace the lens with an artificial intraocular lens (IOL).
- IOL intraocular lens
- the majority of cataractous lenses are removed using a surgical technique called phacoemulsification.
- phacoemulsification a thin cutting tip or needle is inserted into the diseased lens and vibrated ultrasonically. The vibrating cutting tip liquefies or emulsifies the lens, which is aspirated out of the eye.
- the diseased lens once removed, is replaced by an IOL.
- a typical ultrasonic surgical device suitable for an ophthalmic procedure includes an ultrasonically driven handpiece, an attached cutting tip, an irrigating sleeve or other suitable irrigation device, and an electronic control console.
- the handpiece assembly is attached to the control console by an electric cable or connector and flexible tubings.
- a surgeon controls the amount of ultrasonic energy that is delivered to the cutting tip of the handpiece and applied to tissue by pressing a foot pedal to request power up to the maximum amount of power set on the console.
- Tubings supply irrigation fluid to and draw aspiration fluid from the eye through the handpiece assembly.
- the operative part of the handpiece is a centrally located, hollow resonating bar or horn that is attached to piezoelectric crystals.
- the crystals are controlled by the console and supply ultrasonic vibrations that drive both the horn and the attached cutting tip during phacoemulsification.
- the crystal/horn assembly is suspended within the hollow body or shell of the handpiece by flexible mountings.
- the handpiece body terminates in a reduced diameter portion or nosecone at the body's distal end.
- the nosecone is externally threaded to accept the irrigation sleeve.
- the horn bore is internally threaded at its distal end to receive the external threads of the cutting tip.
- the irrigation sleeve also has an internally threaded bore that is screwed onto the external threads of the nosecone.
- the cutting tip is adjusted so that the tip projects only a predetermined amount past the open end of the irrigating sleeve.
- the ends of the cutting tip and the irrigating sleeve are inserted into a small incision in the cornea, sclera, or other location.
- One known cutting tip is ultrasonically vibrated along its longitudinal axis within the irrigating sleeve by the crystal-driven ultrasonic horn, thereby emulsifying the selected tissue in situ.
- the hollow bore of the cutting tip communicates with the bore in the horn that in turn communicates with the aspiration line from the handpiece to the console.
- Other suitable cutting tips include piezoelectric elements that produce both longitudinal and torsional oscillations.
- U.S. Pat. No. 6,402,769 Boukhny
- a reduced pressure or vacuum source in the console draws or aspirates emulsified tissue from the eye through the open end of the cutting tip, the cutting tip and horn bores and the aspiration line, and into a collection device.
- the aspiration of emulsified tissue is aided by a saline solution or other irrigant that is injected into the surgical site through the small annular gap between the inside surface of the irrigating sleeve and the cutting tip.
- One known technique is to make the incision into the anterior chamber of the eye as small as possible in order to reduce the risk of induced astigmatism. These small incisions result in very tight wounds that squeeze the irrigating sleeve tightly against the vibrating tip. Friction between the irrigating sleeve and the vibrating tip generates heat. The risk of the tip overheating and burning tissue is reduced by the cooling effect of the aspirated fluid flowing inside the tip.
- Some known surgical systems use “pulse mode” in which the amplitude of fixed-width pulses can be varied using a controller, such as a foot pedal.
- Other known surgical systems utilize “burst mode” in which each pulse of a series of periodic, fixed width, constant amplitude pulses is followed by an “off” time. The off time can be varied using a controller.
- Other known systems use pulses having an initial maximum power level followed by a lower power level. For example, Publication No. PCT/US2004/007318 describes pulses that rise from zero to an initial, maximum power level, and then subsequently decrease to lower levels.
- Cavitation is the formation of small bubbles resulting from the back and forth movement of an ultrasonic tip. This movement causes pockets of low and high pressure. As the ultrasonic tip moves backwards, it vaporizes liquid due to a low local pressure and generates bubbles. The bubbles are compressed as the tip moves forwards and implode. Imploding bubbles can create unwanted heat and forces and complicate surgical procedures and present dangers to the patient.
- the method includes programming linear rise and linear decay components, which are programmed separately from a natural rise and a natural decay caused by activating and deactivating a power element that generates the pulses.
- the method also includes generating a pulse having multiple segments.
- a first segment includes the linear rise component that increases from a first amplitude to a second amplitude.
- the second segment begins at the end of the first segment and is at the second amplitude.
- the third segment includes the linear decay component that decreases from the second amplitude to a third amplitude.
- a method of generating energy for use with an ophthalmic surgical device that includes generating a plurality of pulses, each of which includes multiple segments.
- a first pulse segment increases linearly from a first amplitude to a second amplitude in about 5-500 milliseconds.
- a second pulse segment is at the second amplitude for a pre-determined amount of time.
- a third pulse segment decreases linearly between the second amplitude and the third amplitude in about 5-500 milliseconds.
- the rates at which the first and third pulse segments respectively rise and decay are programmed separately from a natural rise and decay caused by activating and deactivating a power element that generates pulses.
- the linear rise component can increase slower than a natural rise when the power element is activated.
- the linear decay component can decay slower than a natural decay when the power element is de-activated.
- the first amplitude can be zero or non-zero.
- the linear rise component can increase at a rate that is about the same as or faster than the rate at which the linear decay component decreases.
- the third amplitude can be about the same as or greater than the first amplitude.
- a method of generating energy for use in an ophthalmic surgical device includes generating a plurality of pulses having first and second rectangular pulse segments.
- the first rectangular pulse segment is at a first amplitude for a pre-determined amount of time
- the second rectangular pulse segment is at a second amplitude for a pre-determined amount of time.
- a beginning of the second rectangular pulse segment follows an end of the first rectangular pulse segment,.
- the second amplitude is greater than the first amplitude.
- a multi-segment pulse may include more than two segments, e.g., three, four, five and other numbers of segments of increasing amplitude.
- the first and second rectangular pulse segments can be about the same duration and the amplitudes of the first and second rectangular pulses can be adjusted in response to a controller, such as a foot pedal.
- FIG. 1 illustrates an exemplary phacoemulsification surgical system that may be used with various embodiments
- FIG. 2A is block diagram showing components of an exemplary phacoemulsification surgical system
- FIGS. 2B and 2C illustrate pulses for use with a phacoemulsification surgical system
- FIG. 3 illustrates pulses having linear rise and linear decay components and a constant maximum amplitude component according to one embodiment
- FIG. 4 illustrates pulses having linear rise and linear decay components that meet at a maximum point according to a further embodiment
- FIG. 5 illustrates a combination of pulses having a rectangular pulse and a pulse having a linear component according to another embodiment
- FIG. 6 illustrates a combination of pulses having a rectangular pulse and a pulse having a linear component according to further embodiment
- FIG. 7 illustrates a combination of pulses having a rectangular pulse and a pulse having a linear component according to yet a further embodiment
- FIG. 8 illustrates a combination of pulses having a rectangular pulse and a pulse having a linear component at the same amplitude according to one embodiment
- FIG. 9 illustrates pulses having linear rise and decay components, a constant amplitude component that has sequentially increasing power according to one embodiment
- FIG. 10 illustrates pulses having linear rise and decay components that meet at a maximum point and that have sequentially increasing power according to a further embodiment
- FIG. 11 illustrates a combination of rectangular pulses and pulses having a linear component having sequentially increasing power according to one embodiment
- FIG. 12 illustrates pulses having linear rise and decay components, a constant amplitude component and sequentially decreasing power according to one embodiment
- FIG. 13 illustrates pulses having linear rise and linear decay components that meet at a maximum point and having sequentially decreasing power according to a further embodiment
- FIG. 14 illustrates a combination of rectangular pulses and pulses having a linear component and that have sequentially decreasing power according to another embodiment
- FIG. 15 illustrates known fixed burst mode pulses
- FIG. 16 illustrates known linear burst mode pulses
- FIG. 17 illustrates known pulse mode pulses
- FIG. 18 illustrates continuous transformation of burst mode pulses to pulse mode pulses in response to a controller according to one embodiment
- FIG. 19 illustrates continuous transformation of pulse mode pulses to burst mode pulses in response to a controller according to another embodiment
- FIG. 20 illustrates multi-segment rectangular pulses having two pulse segments with increasing amplitude according to yet another embodiment
- FIG. 21 illustrates a multi-segment rectangular pulse according to an alternative embodiment having three pulse segments with increasing amplitude
- FIG. 22 illustrates packets of pulses of ultrasonic energy shown in FIG. 10 ;
- FIG. 23 illustrates packets of pulses of ultrasonic energy shown in FIG. 13 .
- FIGS. 1 and 2 illustrate exemplary surgical systems.
- FIG. 1 illustrates one suitable system and represents the INFINITI® Vision System available from Alcon Laboratories, Inc., 6201 South Freeway, Q-148, Fort Worth, Tex. 76134.
- FIG. 2A illustrates an exemplary control system 100 that can be used with this system.
- the control system 100 is used to operate an ultrasound handpiece 112 and includes a control console 114 , which has a control module or CPU 116 , an aspiration, vacuum or peristaltic pump 118 , a handpiece power supply 120 , an irrigation flow or pressure sensor 122 (such as in the Infiniti® system) and a valve 124 .
- a control console 114 which has a control module or CPU 116 , an aspiration, vacuum or peristaltic pump 118 , a handpiece power supply 120 , an irrigation flow or pressure sensor 122 (such as in the Infiniti® system) and a valve 124 .
- Various ultrasound handpieces 112 and cutting tips can be utilized including, but not limited to, handpieces and tips described in U.S. Pat. Nos.
- the CPU 116 may be any suitable microprocessor, micro-controller, computer or digital logic controller.
- the pump 118 may be a peristaltic, a diaphragm, a Venturi or other suitable pump.
- the power supply 120 may be any suitable ultrasonic driver.
- the irrigation pressure sensor 122 may be various commercially available sensors.
- the valve 124 may be any suitable valve such as a solenoid-activated pinch valve.
- An infusion of an irrigation fluid, such as saline may be provided by a saline source 126 , which may be any commercially available irrigation solution provided in bottles or bags.
- the irrigation pressure sensor 122 is connected to the handpiece 112 and the infusion fluid source 126 through irrigation lines 130 , 132 and 134 .
- the irrigation pressure sensor 122 measures the flow or pressure of irrigation fluid from the source 126 to the handpiece 112 and supplies this information to the CPU 116 through the cable 136 .
- the irrigation fluid flow data may be used by the CPU 116 to control the operating parameters of the console 114 using software commands.
- the CPU 116 may, through a cable 140 , vary the output of the power supply 120 being sent to the handpiece 112 and the tip 113 though a power cable 142 .
- the CPU 116 may also use data supplied by the irrigation pressure sensor 122 to vary the operation of the pump 118 and/or valves through a cable 144 .
- the pump 118 aspirates fluid from the handpiece 112 through a line 146 and into a collection container 128 through line 148 .
- the CPU 116 may also use data supplied by the irrigation pressure sensor 122 and the applied output of power supply 120 to provide audible tones to the user. Additional details concerning such surgical systems can be found in U.S. Pat. No. 6,179,808 (Boukhny, et al.) and U.S. Pat. No. 6,261,283 (Morgan, et al.), the entire contents of which are incorporated herein by reference.
- the control console 114 can be programmed to control and manipulate pulses that are delivered to the handpiece 112 and, in turn, control the power of the pulses of the handpiece that is used during surgery.
- the pulses are generated in packets or in on periods and off periods. In the illustrated example, the pulses have a 50% duty cycle. Indeed, various on-times, off-times and duty cycles can be used for different applications.
- FIGS. 3-21 Embodiments of pulse manipulation that can be used with the exemplary phacoemulsification surgical system described above are illustrated in FIGS. 3-21 , which can be organized as micro-bursts or packets of pulses, as shown in FIGS. 2B and 2C .
- the packets or bursts of pulses are provided to the ultrasound handpiece, which generates a generally corresponding output at the ultrasonic tip.
- one or both of the rise and decay components 310 and 312 of each pulse 300 can be programmed separately from a natural rise and natural decay.
- rise and decay components 310 and 312 can be programmed is with linear and/or non-linear functions separately from natural rise and decay times that occur due to switching an amplifier on and off to generate pulses.
- pulses e.g., square and rectangular pulses
- such pulses have natural rise and decay times, e.g., exponential rise and decay times, which are caused by a load or impedance.
- typical natural decay times can be about 4 milliseconds (ms).
- Embodiments in contrast, are directed to controlling linear rise and linear decay times separately from natural transitions that are caused by switching an amplifier on and off by setting or programming the rise and/or decay functions.
- Controlling the rise and decay components 310 and 312 and rise and decay times 312 and 322 provides advantageously allows different pulse configurations to be generated for particular surgical applications and systems.
- pulses having programmed rise components 310 that gradually increase in power allow the lens material to be positioned more accurately.
- Gradual power transitions for example, do not prematurely push the lens material away from the tip of the handpiece.
- known systems using pulses having sharp minimum to maximum transitions may inadvertently push lens material away from the tip too quickly, thus complicating the surgical procedure.
- pulses that include programmed rise components can improve the positioning and cutting of lens material and the effectiveness of surgical procedures.
- programming decay components and pulse times allows less energy to be delivered to the eye, resulting in less heating of the tissue.
- the programmed rise and/or decay component is programmed according to a linear function.
- each pulse 300 is programmed with two linear components-a linear rise component 310 and a linear decay component 320 .
- the linear rise component 310 increases from a first amplitude to a second amplitude.
- An intermediate component 330 extends between the linear components 310 and 320 at a second amplitude.
- the decay component 330 decreases from the second amplitude to a third amplitude.
- the linear rise component 310 has a linear rise time 312
- the linear decay component 320 has a linear decay time 322
- the maximum amplitude component 330 has a maximum amplitude or active or “on” time 332 .
- Linear rise and linear decay times 312 and 322 can vary depending on the maximum power level of a pulse since more time is typically required to reach higher power levels.
- the linear rise time 312 can be programmed to be about 5 ms to about 500 ms. If a pulse must reach 100% power, the duration of the linear rise time 312 may be longer. However, if the pulse must reach less than 100% power, then the linear rise time 312 can be shorter, e.g. less than or about 5 ms. Linear rise time 312 durations may increase with increasing power levels and can be appropriately programmed using the control console 114 . If necessary, the rate at which the linear component increases can be limited to protect power components, such as an amplifier.
- the linear decay time 322 can be programmed to be about 5 ms to about 500 ms.
- the liner decay time 322 is programmed using the control console 114 so that power decays linearly and about 70% of the power dissipates in about 2 ms, and about 98% of the power dissipates in about 4 ms.
- the linear decay time 322 may be longer than, about the same as, or shorter than the linear rise time 312 .
- FIG. 3 illustrates the decay time 322 being longer than the rise time 312 .
- the linear decay time 322 can be longer or slower than a natural decay time.
- the rise and decay rates may also be the same so that the pulse is symmetrical and has both programmed rise and decay components.
- the maximum amplitude or active or “on” time 332 can vary with different applications.
- the maximum amplitude time can be about 5 ms to about 500 ms.
- the intermediate component 330 has a constant amplitude (at the second amplitude).
- the duration of the maximum amplitude time can be less than 5 ms depending on, for example, required power and resulting heat considerations.
- the amplitude may vary across the intermediate component 330 , e.g., increase or decrease between the first and second components 310 and 320 .
- the rise component 310 begins at a non-zero level. In an alternative embodiment, the rise component 310 can begin at a zero level. The initial power level may depend on the particular surgical procedure and system configuration. Similarly, the decay component 320 can end at a zero or non-zero power level.
- FIG. 3 illustrates the first and third amplitudes being about the same. In alternative embodiments, they can be different. For example, the third amplitude at the end of the decay component 320 can be greater than the first amplitude.
- the programmed rise and/or decay component can be a non-linear component.
- a non-linear component can be programmed according to logarithmic, exponential and other non-linear functions.
- FIG. 3 illustrates linear rise and decay components.
- one or both of the rise and decay components can be programmed with a non-linear function.
- a pulse 400 is programmed with linear rise and linear decay components 310 and 320 that meet at a maximum point 410 at a second amplitude rather than having an intermediate component 330 , as shown in FIG. 3 .
- the programmed rise and decay times 312 and 322 are equal.
- the linear rise and decay components 310 and 320 meet at a midpoint.
- linear rise and decay times 312 and 322 can be programmed to be about 5 ms to about 500 ms.
- the rise and decay times may not be equal, and the maximum point 410 may not be a midpoint.
- pulses having one or more linear and/or non-linear components can be combined with other pulses and pulse patterns.
- FIGS. 5-8 illustrate pulses having programmed linear components, however, one or more programmed linear components can be replaced with a programmed non-linear component.
- FIG. 5 illustrates a sequence or combination 500 of pulses having a first rectangular pulse 510 , a second rectangular pulse 520 , a pulse 530 having a linear decay component, a pulse 540 having a linear rise component and a pulse 550 having linear rise and linear decay components, similar to the pulse shown in FIG. 4 .
- FIG. 6 illustrates a sequence or combination 600 of pulses according to another embodiment that includes a pulse 610 having linear rise and decay components and an intermediate component, similar to the pulse shown in FIG. 3 , a rectangular pulse 620 , a rectangular pulse 630 having a longer duration than pulse 620 , a pulse 640 having a linear decay component and a pulse 650 having a linear rise component.
- FIG. 7 illustrates yet a further embodiment of a sequence or combination 700 of pulses that includes a pulse 710 having a linear decay component, a multi-segment rectangular pulse 720 having decreasing amplitude, a pulse 730 having a linear decay component, a pulse 740 having a linear decay component and a 750 pulse having both linear rise and linear decay components, similar to the pulse shown in FIG. 4 , and another rectangular pulse 760 .
- FIG. 8 illustrates a further alternative embodiment of a sequence or combination 800 of pulses having the same maximum amplitude and at least one pulse having a linear component.
- FIG. 8 illustrates a pulse 810 having a linear decay component, a multi-segment rectangular pulse 820 having decreasing amplitude, a pulse 810 having a linear decay component, a pulse 840 having a linear decay component, a pulse 850 having both linear rise and decay components, similar to the pulse shown in FIG. 4 , and a rectangular pulse 860 .
- each pulse in a packet of pulses can have an attribute that differentiates it from other pulses, e.g., based on different amplitude, duration, shape, number of programmed linear components and/or power.
- pulse combinations can have pulses having different powers, amplitudes, shapes and durations.
- pulse combinations can have different numbers of pulses, different numbers of rectangular and square pulses, different numbers of pulses having linear components, different numbers of pulses having one linear component, numbers of pulses having two linear components, and different numbers of pulses having two linear components and a constant amplitude component.
- the rectangular pulses and pulses having one or more linear component can be placed in different positions and sequences, e.g., and at the beginning or end of a pulse sequence, or somewhere in between.
- the order of rectangular (or other shaped pulses) and pulses having a linear component can be altered depending on the surgical application and the system used. Certain pulses may be grouped together or commingled with other types of pulses.
- rectangular pulses 510 and 520 are grouped together and pulses 520 , 530 and 540 having a linear component are grouped together.
- one or more non-rectangular pulses can be between the rectangular pulses so that the rectangular pulses are commingled with different types pulses.
- one or more pulses that do not include a linear component can be placed between the pulses having a programmed linear component.
- pulses having a programmed linear component are included in a pattern of pulses in which each pulse has sequentially decreasing power or increasing power.
- FIGS. 9-11 illustrate pulse sequences in which each pulse has sequentially higher power
- FIGS. 12-14 illustrate pulse sequences in which each pulse has sequentially decreasing power.
- an alternative embodiment includes a sequence or combination 900 of pulses that includes pulses 910 , 920 , 930 , 940 and 950 , each of which is similar to the pulses shown in FIG. 3 .
- Each successive pulse has a higher power (P 1 -P 5 ) than a prior pulse.
- pulse 930 has a power P 3 , which is greater than the power P 2 of pulse 920 .
- FIG. 10 illustrates an alternative embodiment in which a sequence or combination 1000 of pulses includes pulses 1010 , 1020 , 1030 , 1040 , and 1050 , each of which is similar to the pulses shown in FIG. 4 .
- Each successive pulse has a higher power than a prior pulse.
- FIG. 11 illustrates yet a further embodiment in which a sequence or combination 1100 of pulses includes pulses of various shapes and sizes, including rectangular pulses and at least one pulse having a linear component. Each successive pulse has a higher power than a prior pulse.
- a sequence or group of pulses having an initial low power level and subsequent increasing power levels may be useful to effectively hold and control lens material at a tip of an ultrasound handpiece, while gradually increasing power to emulsify lens material.
- a sequence or combination 1200 of pulses includes pulses 1210 , 1220 , 1230 , 1240 and 1250 , each of which is similar to the pulse shown in FIG. 3 .
- Each pulse includes a programmed linear rise component 310 and a programmed linear decay component 320 .
- Each pulse has reduced power relative to a prior pulse. For example, pulse P 3 has less power than pulse P 2 , and pulse P 4 has less power than pulse P 3 .
- a sequence or group of pulses includes pulses 1310 , 1320 , 1330 , 1340 and 1350 .
- Each pulse is similar to the pulse shown in FIG. 4 , and each pulse has reduced power relative to a prior pulse.
- FIG. 14 illustrates yet a further embodiment in which a sequence or combination 1400 of pulses 1410 , 1420 , 1430 , 1440 and 1450 having reduced power over time.
- the combination 1400 includes pulses having different shapes and sizes, including rectangular pulses and pulses having a linear component.
- alternative embodiments are directed to transforming pulses between different pulse modes in response to a controller, such as a foot pedal or foot switch.
- a controller such as a foot pedal or foot switch.
- pulses are transferred between burst and pulse modes.
- Pulse patterns are shown relative to four foot pedal positions, which may or may not be defined by a detent or position indicator. Persons skilled in the art will appreciate that a foot pedal or switch can have other numbers of positions, and that the transitions described herein can be performed by pressing and releasing the foot pedal.
- “burst” mode provides a series of periodic, fixed width, constant amplitude pulses 1500 of ultrasonic power, each of which is followed by an “of” time 1510 .
- the off time 1510 between pulses 1500 is controlled by the surgeon's input by moving or pressing the foot pedal.
- each pulse 1500 has a fixed “on” time 1520 , and a variable “off” time 1510 , and the “off” time 1510 is adjusted based on the user's manipulation of the foot pedal.
- Burst mode pulses can have active times of about 5 ms to about 500 ms.
- burst mode pulses may be “fixed burst” mode pulses as shown in FIG. 15 or, alternatively, be “linear burst” mode pulses as shown in FIG. 16 .
- fixed burst mode pressing the foot pedal decreases the off-time 1510 , while the amplitude of the pulses remains constant.
- linear burst mode pressing the foot pedal decreases the off-time 1500 and, in addition, adjusts the amplitude. In the illustrated embodiment, pressing the foot pedal increases the amplitude.
- the power “Off” time 1510 can be adjusted, and the amplitude of pulses may or may not be adjusted.
- FIGS. 15 and 16 illustrate a foot pedal in four positions.
- the off time 1510 decreases when the foot pedal is initially at Position 1 and pressed further to Position 2 .
- the number of fixed width, constant amplitude pulses 1500 increases as the foot pedal is pressed.
- the off time 1510 eventually reaches a pre-determined off time 1520 , e.g., the on time 1520 or another suitable time. Pressing the foot pedal further from position 3 to position 4 reduces the off time 1510 to zero, i.e., a 100% on-time 1520 (continuous mode).
- FIG. 16 illustrates the pulses are linear burst mode pulses, and the amplitude of the pulses also increases as the foot pedal is moved among different positions.
- the amplitude of fixed-width pulses 1700 changes according to the position of the foot pedal. In the illustrated embodiment, the amplitude increases by pressing the foot pedal.
- FIGS. 18 and 19 alternative embodiments are directed to transforming pulses between burst and pulse modes in response to movement of the foot pedal.
- FIG. 18 illustrates transitioning from burst mode to pulse mode.
- the foot pedal is pressed from Position 1 to Position 2 to decrease the off time 1510 .
- the off-time decreases further when the foot pedal is pressed from Position 2 to Position 3 .
- the number of fixed width, constant amplitude pulses in a period of time increases as the foot pedal is pressed further.
- the off time 1510 eventually reaches a pre-determined value, such as the on time 1520 or another suitable value.
- the pre-determined value is equal to the on-time 1520 .
- the pulse amplitude is then adjusted after the off time 1510 is the same as the on time 1520 (or another suitable value), thereby increasing energy generated by the handpiece, and transforming pulses from burst mode to pulse mode pulses.
- pulses are transformed from pulse mode to burst mode pulses. If the system is initially in pulse mode and the foot pedal is pressed to position 4 , releasing the foot pedal initially decreases the amplitude of the pulses. After the amplitude reaches a pre-determined amplitude, releasing the foot pedal further results in adjusting the burst mode and increasing the power “Off” time 1510 , thereby providing fewer fixed width pulses 1500 in a given time and less power to the ultrasonic tip 113 , in order to cool the tip 113 .
- a surgeon can advantageously switch between burst mode and pulse mode pulses by manipulating a single controller, e.g., by pressing and releasing the foot pedal.
- This arrangement is particularly beneficial since these transformations can be achieved without the interruptions and adjustments that are otherwise associated with changing to different pulse modes, e.g., adjusting parameters on a display screen or interface.
- embodiments advantageously allow continuous pulse transitions by pressing and releasing the foot pedal as part of a natural and continuous motion of the surgeon's foot, thereby simplifying the configuration and operation of surgical equipment and simplifying surgical procedures.
- the amount of power of each pulse can be gradually increased by utilizing a multi-step or multi-segment pulse 2000 .
- a multi-segment pulse can have two, three, four and other numbers of segments.
- the two-segment pulse shown in FIG. 20 is provided for purposes of illustration, not limitation.
- a first step 2010 has less power than a subsequent step 2020 .
- a first pulse segment 2010 is at a first amplitude for a pre-determined time, followed by a second pulse segment 2020 at a second amplitude for a pre-determined time.
- Configuring a multi-segment pulse to provide a gradual transition from low power to higher power provides the ability to hold and emulsify lens material more accurately in contrast to abrupt transitions from low to maximum power levels such as in a typical square, which can inadvertently move lens material away from the tip during cutting of the lens material
- a multi-segment pulse 2100 may have more than two segments of increasing amplitude.
- a pulse has three pulse segments 2110 , 2120 and 2130 . Other pulses may have four, five and other numbers of pulse segments as needed.
- the different pulses and pulse patterns described above are pulses of ultrasonic energy that can be delivered in packets to transducer elements of the handpiece.
- ultrasonic energy is delivered to piezoelectric elements as intermittent packets of pulses that are separated by an off period.
- the pulses patterns according to alternative embodiments of the invention described above are delivered to piezoelectric elements of an ultrasound handpiece during these “on” times and within these packets.
- FIG. 23 illustrates packets of pulses of ultrasonic energy having sequentially increasing power, as shown in FIG. 10 .
- FIG. 24 illustrates packets of pulses of ultrasonic energy having sequentially decreasing power, as shown in FIG. 13 .
- a packet may have one or multiple groups of pulses, and that a packet may end at the end of a group of pulses or in the middle of a group of pulses.
- FIGS. 22 and 23 illustrate a packet ending with the second pulse in a group of pulses. The packet may also end with the last pulse in the group of pulses.
- FIGS. 22 and 23 are provided for purposes of illustration, not limitation. Persons skilled in the art will also appreciate that the embodiments of pulses described in this specification are not required to be framed or organized in packets in order to control the ultrasound handpiece.
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Priority Applications (27)
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US11/216,724 US20070078379A1 (en) | 2005-08-31 | 2005-08-31 | Controlling a phacoemulsification surgical system by transitioning between pulse and burst modes |
US11/216,475 US20070056596A1 (en) | 2005-08-31 | 2005-08-31 | Pulse manipulation for controlling a phacoemulsification surgical system |
CA2555955A CA2555955C (en) | 2005-08-31 | 2006-08-08 | Pulse manipulation for controlling a phacoemulsification surgical system |
AT06118991T ATE432060T1 (de) | 2005-08-31 | 2006-08-16 | Pulsmanipulation zur kontrolle eines phakoemulsifikationssystems |
EP07107964A EP1832259B1 (de) | 2005-08-31 | 2006-08-16 | Manipulation der Pulsamplitude zur Steuerung eines chirurgischen Phacoemulsifikationssystems |
AT07107964T ATE433311T1 (de) | 2005-08-31 | 2006-08-16 | Manipulation der pulsamplitude zur steuerung eines chirurgischen phacoemulsifikationssystems |
ES06118988T ES2325869T3 (es) | 2005-08-31 | 2006-08-16 | Control de un sistema quirurgico de facoemulsificacion mediante la transicion entre los modos de impulso y de rafaga. |
DE602006007209T DE602006007209D1 (de) | 2005-08-31 | 2006-08-16 | Manipulation der Pulsamplitude zur Steuerung eines chirurgischen Phacoemulsifikationssystems |
AT06118988T ATE432059T1 (de) | 2005-08-31 | 2006-08-16 | Kontrolle eines phakoemulsifikationssystems durch wechsel zwischen puls- und burst-modus |
ES06118991T ES2323809T3 (es) | 2005-08-31 | 2006-08-16 | Manipulacion de impulsos para controlar un sistema quirurgico de facoemulsificacion. |
EP06118988A EP1759672B1 (de) | 2005-08-31 | 2006-08-16 | Kontrolle eines Phakoemulsifikationssystems durch Wechsel zwischen Puls- und Burst-Modus |
DE602006006948T DE602006006948D1 (de) | 2005-08-31 | 2006-08-16 | Kontrolle eines Phakoemulsifikationssystems durch Wechsel zwischen Puls- und Burst-Modus |
ES07107964T ES2325287T3 (es) | 2005-08-31 | 2006-08-16 | Manipulacion de la amplitud de impulsos para controlar un sistema quirurgico de facoemulsificacion. |
EP06118991A EP1759674B1 (de) | 2005-08-31 | 2006-08-16 | Pulsmanipulation zur Kontrolle eines Phakoemulsifikationssystems |
DE602006006949T DE602006006949D1 (de) | 2005-08-31 | 2006-08-16 | Pulsmanipulation zur Kontrolle eines Phakoemulsifikationssystems |
EP06118989A EP1759673B1 (de) | 2005-08-31 | 2006-08-16 | Pulsmanipulation zur Kontrolle eines Phakoemulsifikationssystems |
CA2556639A CA2556639C (en) | 2005-08-31 | 2006-08-21 | Controlling a phacoemulsification surgical system by transitioning between pulse and burst modes |
CA2556527A CA2556527C (en) | 2005-08-31 | 2006-08-21 | Pulse manipulation for controlling a phacoemulsification surgical system |
AU2006203720A AU2006203720B2 (en) | 2005-08-31 | 2006-08-28 | Pulse manipulation for controlling a phacoemulsification surgical system |
AU2006203723A AU2006203723B2 (en) | 2005-08-31 | 2006-08-28 | Pulse manipulation for controlling a phacoemulsification surgical system |
AU2006203721A AU2006203721B2 (en) | 2005-08-31 | 2006-08-28 | Controlling a phacoemulsification surgical system by transitioning between pulse and burst modes |
JP2006233478A JP4838074B2 (ja) | 2005-08-31 | 2006-08-30 | 眼科手術機器で使用するエネルギーを発生させる方法 |
JP2006233694A JP4838076B2 (ja) | 2005-08-31 | 2006-08-30 | 眼科手術機器で使用するエネルギーを発生させる方法 |
JP2006233562A JP4838075B2 (ja) | 2005-08-31 | 2006-08-30 | 眼科手術機器で使用するエネルギーを発生させる方法 |
US12/875,249 US20100331764A1 (en) | 2005-08-31 | 2010-09-03 | Controlling A Phacoemulsification Surgical System By Transitioning Between Pulse and Burst Modes |
JP2011006303A JP5266345B2 (ja) | 2005-08-31 | 2011-01-14 | 眼科手術機器で使用するエネルギーを発生させる方法 |
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US11/216,475 US20070056596A1 (en) | 2005-08-31 | 2005-08-31 | Pulse manipulation for controlling a phacoemulsification surgical system |
US11/216,724 US20070078379A1 (en) | 2005-08-31 | 2005-08-31 | Controlling a phacoemulsification surgical system by transitioning between pulse and burst modes |
US11/215,923 US8353297B2 (en) | 2005-08-31 | 2005-08-31 | Pulse manipulation for controlling a phacoemulsification surgical system |
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US11/216,724 Abandoned US20070078379A1 (en) | 2005-08-31 | 2005-08-31 | Controlling a phacoemulsification surgical system by transitioning between pulse and burst modes |
US11/215,923 Active 2030-04-30 US8353297B2 (en) | 2005-08-31 | 2005-08-31 | Pulse manipulation for controlling a phacoemulsification surgical system |
US12/875,249 Abandoned US20100331764A1 (en) | 2005-08-31 | 2010-09-03 | Controlling A Phacoemulsification Surgical System By Transitioning Between Pulse and Burst Modes |
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US11/215,923 Active 2030-04-30 US8353297B2 (en) | 2005-08-31 | 2005-08-31 | Pulse manipulation for controlling a phacoemulsification surgical system |
US12/875,249 Abandoned US20100331764A1 (en) | 2005-08-31 | 2010-09-03 | Controlling A Phacoemulsification Surgical System By Transitioning Between Pulse and Burst Modes |
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AT (3) | ATE433311T1 (de) |
AU (3) | AU2006203723B2 (de) |
CA (3) | CA2555955C (de) |
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