Source: http://www.google.com/patents/US4705500?dq=5,664,133
Timestamp: 2017-10-22 19:31:23
Document Index: 435955637

Matched Legal Cases: ['art 330', 'art 330', 'art 276', 'art 330', 'art 276', 'art 330', 'art 330', 'art 330']

Patent US4705500 - Ophthalmic aspirator-irrigator - Google Patents
An ophthalmic aspirator-irrigator system for use during cataract surgery is disclosed. The system frees both hands of the surgeon for the surgical tasks and leaves the automatic operation of the system to a single control input operated by a foot pedal. The pedal controls both the aspiration and ejection...http://www.google.com/patents/US4705500?utm_source=gb-gplus-sharePatent US4705500 - Ophthalmic aspirator-irrigator
Publication number US4705500 A
Application number US 06/886,371
Also published as DE3769019D1, EP0253478A1, EP0253478B1
Publication number 06886371, 886371, US 4705500 A, US 4705500A, US-A-4705500, US4705500 A, US4705500A
Inventors Harry G. Reimels, David A. Walsh, Michael J. Arsenault
Original Assignee Mentor O & O, Inc.
Patent Citations (6), Referenced by (106), Classifications (11), Legal Events (5)
Ophthalmic aspirator-irrigator
US 4705500 A
An ophthalmic aspirator-irrigator system for use during cataract surgery is disclosed. The system frees both hands of the surgeon for the surgical tasks and leaves the automatic operation of the system to a single control input operated by a foot pedal. The pedal controls both the aspiration and ejection functions as well as their respective speeds. The opthalmic aspirator-irrigator system essentially comprises a hand-held device, a control box operable by the foot pedal and a power cord connecting the device with the box. A source of fluid is connected via a tube to the device to effect the irrigation function. The control box includes a power source and a circuit coupled to the source and via the cord to the device. Preferably, the circuit includes a bridge output network controlled by a linear motion slide type potentiometer controlled by the foot pedal. The circuit further includes dual DC amplifiers and a pulse-width modulated gate circuit to operate the device bidirectionally with a smooth, continuous and varibale speed. The foot pedal has two zero control positions: in its off, non-depressed position and in its off position about midway through the pedal's downward travel.
1. An ophthalmic aspirator-irrigator comprising:
(a) a hand-held device;
(b) said device including a cannula having an axial channel and a surrounding annular channel, pressure-differential creating means connected to said axial channel, and drive means operatively connected to said last means for driving the same;
(c) a source of fluid connected via a flexible tube to said annular channel;
(d) foot-operable control means for controlling the operation of said drive means and provided with a pedal, a power source, a circuit connected to said source, and a socket coupled to said circuit;
(e) a flexible power cord having a plug designed to be connected to said socket for coupling power from said power source to said drive means; and
(f) a container enclosing said cannula and said pressure-differential creating means;
(g) said foot-operable control means being portable and said power source comprising a battery pack.
2. The ophthalmic aspirator-irrigator of claim 1 wherein said cannula is provided with a tapered tip, an aspiration port formed in the side of said tapered tip and connecting with said axial channel and at least one irrigation opening also formed in the side of said tapered tip and at a right angle thereto and connecting with said surrounding annular channel.
3. The ophthalmic aspirator-irrigator of claim 1 wherein said pressure differential creating means includes a D.C. micro-motor, a gear head connected to said motor, a peristaltic pump and a shaft coupling said motor via said gear head to said pump
4. The ophthalmic aspirator-irrigator of claim 1 wherein said circuit includes dual D.C. amplifiers and a pulse-width modulated gate circuit and wherein said circuit controls said drive means bidirectionally with a smooth, continuous speed control effected by an electrical signal generated by said dual D.C. amplifiers, said signal coupled to said pulse-width modulated gate circuit.
5. The ophthalmic aspirator-irrigator of claim 4 further including an audio signal generating means.
6. The ophthalmic aspirator-irrigator of claim 5 wherein said circuit includes a linear motion slide-type potentiometer controlled by said pedal.
7. The ophthalmic aspirator-irrigator of claim 1 wherein said pressure-differential creating means is provided with an externally-threaded sleeve and said drive means is provided with an internally-threaded connecting ring, whereby said drive means is releasably connected to said pressure-differential creating means.
8. An ophthalmic aspirator-irrigator comprising:
(b) a pressure-differential creating means coupled via a flexible tube to said device;
(c) a foot-operable control box;
(d) a power cord for operatively connecting said control box to said pressure differential creating means;
(e) a collection pouch coupled to said pressure-differential creating means for collecting material aspirated by said device;
(f) a source of fluid connected via a flexible tube to said hand-held device; and
(g) fastening means respectively provided for said pressure-differential creating means and said collection pouch, to secure them respectively adjacent a surgical site;
(h) said foot-operable control box provided with a pedal and including a power source and a circuit.
9. The ophthalmic aspirator-irrigator of claim 8 further including an audio signal generating means.
10. The ophthalmic aspirator-irrigator of claim 9 wherein said single control unit comprises a linear motion slide-type potentiometer controlled by said pedal and wherein said circuit comprises dual DC amplifiers coupled to said potentiometer, electronic switch means connected to the outputs of said DC amplifiers, and a pulse-width modulated gate circuit coupled to said drive means and via said electronic switch means to one of the outputs of said DC amplifiers, whereby the position of said foot pedal along its arc of displacement controls both the speed and the direction of said drive means and the operation of said audio signal generating means.
11. The ophthalmic aspirator-irrigator of claim 10 wherein said circuit further includes a comparator network to disable said switch means between the output of said pulse-width modulated gate circuit and said bridge circuit when said foot pedal is located about midway along said arc of displacement.
12. An ophthalmic aspirator-irrigator comprising:
(a) a hand-held device including a cannula, a pressure-differential creating means connected to said cannula, drive means for bidirectionally driving said pressure-differential creating means, and connecting means for releasably securing said cannula to said pressure-differential creating means;
(b) a portable control box for controlling both the speed and the direction of said drive means and provided with a foot pedal having an arc of displacement, a power source, and a circuit coupled via a switch to said foot pedal and said power source;
(c) a flexible power cord connecting said power source to said drive means;
(d) said circuit including a linear motion slide type potentiometer operatively connected to said foot pedal and generating a voltage linearly proportional to the position of said pedal along its said arc of displacement, dual DC amplifiers coupled to said potentiometer to receive said voltage at one of their inputs, a reference voltage connected to the other inputs of said amplifiers, switch means coupled to the outputs of said amplifiers, a pulse-width modulated gate circuit coupled to the output of said switch means, a bridge circuit operatively connected via said flexible power cord to said drive means, and a direction control switch coupling the output of said pulse-width modulated gate circuit to said bridge circuit.
13. The ophthalmic aspirator-irrigator of claim 12 wherein said cannula is formed with an axial channel and a surrounding annular channel and further including a source of gravity-fed fluid connected via a flexible tube to said surrounding annular channel of said cannula, and further including a plastic container for maintaining said cannula and said pressure-differential creating means in a sterile condition.
14. The ophthalmic aspirator-irrigator of claim 13 wherein said cannula is formed with a tapered tip, an aspiration port formed in said tapered tip and being in communication with said axial channel, and a pair of irrigation openings formed in said tapered tip adjacent to but at right angles to said aspiration port and being in communication with said annular channel.
15. The ophthalmic aspirator-irrigator of claim 12 wherein said circuit further includes a comparator network to disable said switch means between the output of said pulse width modulated gate circuit and said bridge curcuit when said foot pedal is located about midway along said arc of displacement.
16. An ophthalmic aspirator-irrigator comprising:
(b) said device including a cannula formed with a hollow cone and a concentric needle, said needle having a central channel in communication with said hollow cone at one end and terminating in a port at the other end and an annular channel surrounding said central channel and terminating in a pair of irrigation openings at its free end;
(c) a pressure-differential creating means operatively connected to said hollow cone and drive means for said pressure-differential creating means mounted adjacent thereto;
(d) a foot operable control box including a source of power;
(e) a power cord for operatively connecting said pressure differential creating means to said control box; and
(f) a source of fluid connected via a flexible tube to said annular channel of said cannula;
(g) said foot-operable control box provided with a foot pedal, a jack for said power cord, visible and manually operable test means for said source of power, an audio signal generating means, means for varying the intensity of said audio signal, and further including a power source and a circuit.
17. The ophthalmic aspirator-irrigator of claim 16 wherein said circuit provides said drive means bidirectionally with a smooth, continuous and variable speed control, said circuit controlling both the speed and the direction of said drive means and the operation of said audio signal generating means via a single control unit, and wherein said single control unit comprises a linear motion slide-type potentiometer controlled by said pedal.
18. The ophthalmic aspirator-irrigator of claim 16 further including a plastic container for maintaining said cannula and said pressure-differential creating means in a sterile condition.
More specifically, it is an object of the present invention to provide an ophthalmic aspirator-irrigator system particularly adapted for use during extracapsular cataract surgery and essentially comprising a hand-held device, a foot operable control box and a power cord operatively connecting the device with the control box. The hand-held device is designed to function both as an aspirator as well as an irrigator, with aspiration and ejection functions and their respective aspiration and ejection speeds controlled by a single control input. The control box is provided with a foot pedal which serves as the single control input of the ophthalmic aspirator-irrigator system. Preferably, a source of gravity-fed fluid is connected via a flexible tube to the hand-held device to effect the irrigation function. The handheld device includes a cannula formed with a hollow cone and a needle projecting therefrom, the needle having a central channel in communication with the cone at one end and terminating in an aspiration port at the other end, and an annular channel surrounding the central channel and communicating with a hollow arm provided on the cone at one end and terminating in a pair of openings at the other end; a pressure-differential creating means connected to the central channel of the cannula; drive means for bidirectionally driving the pressure-differential creating means; and a connecting member mounted adjacent the drive means and replaceably securing the cannula thereto. The control box further includes a power source, which preferably comprises a battery pack, and a circuit coupled to the source. Preferably the circuit, which includes dual D.C. amplifiers and a pulse-width modulated gate circuit, controls the drive means bidirectionally with a smooth, continuous speed control. Preferably, the system includes a linear motion slide-type potentiometer controlled by the foot pedal.
FIG. 17 is a perspective view, on an enlarged scale, of an operative part of the control means shown in FIGS. 2, 10 and 11; and
FIG. 18 is a perspective view of a revised component part of the ophthalmic aspirator-irragator instrument illustrated in FIGS. 14 and 15.
Operation of the Control Circuitry-FIGS. 12 and 13
In FIG. 16 is illustrated a graph 220 plotting the DC voltage applied by the circuitry 102 of FIG. 13 to drive the micro DC motor 62 during the downward displacement of the foot pedal 24 along the arc 26, as against a percentage of displacement along this arc 26. With the pedal 24 slightly depressed, the power switch 114 is closed and full DC power, herein positive six volts, is applied to the DC motor 62 to drive it in full speed reverse, that is clockwise. As a consequence, the peristaltic pump 16 will rotate rapidly clockwise, creating a positive ejaculatory pressure through the aspiration port 52 of the central channel 50 of the cannula 14. As the pedal 24 progressively is more and more depressed, the applied voltage to the motor 62 will fall, decreasing thereby the rotational speed of the pump 16. With the gradual decrease of the pump's 16 speed, the magnitude of the positive ejaculatory pressure through the aspiration port 52 of the cannula 14 also becomes less and less. With about 40% downward displacement of the pedal 24 along the arc 26, a zero applied voltage to the motor 62 is achieved from a previous +2.lV, and the motor 62 and its drive shaft 17 will come to a full stop. As a result, the pump 16 also will cease rotating and no further ejaculatory pressure will be emanating from the port 52. The zero applied voltage condition is maintained during a window through about 60% in the downward travel of the pedal 24 along the arc 26. Further downward motion of the pedal 24 first will apply a negative DC voltage slightly in excess of 2V to the motor 62, reversing its rotation into a counter-clockwise direction but with a slow initial speed. As a result, the pump 16 will begin slowly to rotate in a counter-clockwise direction, creating thereby a negative aspiratory pressure through the aspiration port 52 of the cannula 14. With the further gradual depression of the pedal 24, the negative applied voltage to the DC motor 62 also is increased, progressively increasing thereby the speed of rotation of the pump 16. Consequently, the negative aspiratory pressure through the aspiration port 52 also is increased. With about 90% in the extent of the downward travel of the pedal 24 along the arc 26, almost maximum -6 V is applied to the motor 62, bringing its rotational speed to the maximum. With the foot pedal 24 pressed all the way down (as shown in phantom lines in FIG. 2), maximum negative aspiration pressure is maintained through the aspiration port 52.
With the hollow cone 286 of the cannula 274 in place over the frusto-conical shaped end 298 of the pressure-differential creating means 276, the central channel of the cannula 274 is in fluid-communication with an inner chamber 300 formed within the tubular body 294 via a channel 302, all as may be best observed in FIG. 15. A plunger 304 is designed to be axially displaced within the chamber 300. The plunger 304 is formed with an axial channel 306 to accommodate an externally threaded drive shaft 308 designed to rotate, and thus be axially displaced, within a hexagonal standoff 310 secured in the rear end of the plunger 304. A hexagonal socket 312 is formed in the free end of the drive shaft 308. Rotating the drive shaft 308 clockwise will cause the plunger 304 to travel toward the rear (to the left in FIG. 15) within the tubular body 294. An externally-threaded sleeve 314 is secured about the rear end 296 of the tubular body 294 to prevent the plunger 304 from being withdrawn therefrom, the condition shown in FIG. 15. A counter-clockwise rotation of the drive shaft 308 will now cause the plunger 304 to travel forward (i.e., to the right in FIG. 15 ) within the inner chamber 300 until the plunger 304 abuts the front end of the tubular body 294.
As will be noted, part 330 takes the place of the pressure-differential creating means 276, i.e., the pump. Its forward end of the part 330 preferably is a bit longer than that of the part 276, which makes the inner chamber of the part 330 correspndingly longer than is the chamber 300 of the part 276. This enlarged chamber of the revised part 330 is preloaded with the viscous material. The viscous material is maintained in an air tight environment between the plunger 304, which of course remains the same, and a plug 332 designed temporarily to block the channel 302. The plug 332 is then broken off by the user before the part 330 is inserted into the cannula 274 immediately prior to its operative use. The plug 332 may be formed integral with the body of the part 330 or it may be inserted into the channel 302 after its inner chamber has been filled with the viscous material.
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U.S. Classification 604/35, 604/30, 604/22
International Classification A61B46/23, A61F9/007, A61F9/00, A61B17/00
Cooperative Classification A61F9/00736, A61B2017/00977, A61B2046/236
Owner name: MENTOR O & O, INC., SOUTH SHORE PARK, HINGHAM, MA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:REIMELS, HARRY G.;WALSH, DAVID A.;ARSENAULT, MICHAEL J.;REEL/FRAME:004648/0466
Owner name: MENTOR O & O, INC., A CORP OF MA,MASSACHUSETTS
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:REIMELS, HARRY G.;WALSH, DAVID A.;ARSENAULT, MICHAEL J.;REEL/FRAME:004648/0466