US3659607A - Method for performing surgical procedures on the eye - Google Patents

Abstract

The method relates to performing surgical procedures on the eye in vivo, including forming of an opening therein to permit the insertion of instrumentation within the eye for various procedures.

Description

I Unlted States Patent 1151 3,659,607 Banko 1 May 2, 1972 54 METHOD FOR PERFORMING [56] Reierences Cited SURGICAL PROCEDURES ON THE EYE UNITED STATES PATENTS [72] 5 Bmklyn 916,441 3/1909 l-lachmann ..12s/347 ux [73] Assignee: Surgical Design Corporation, Long Island, 3,039,468 6/1962 Price ..128/329 X N.Y. 3,074,407 1/1963 Moon et al.. 128/303 [22] Filed: Aim 6, 1970 3,458,870 8/1969 Stone, .lr ..3/13

[2]] Appl. No.: 25,669 Primary Examiner-Channing L. Pace Attorney-Darby & Darby Related US. Application Data [62] Division of Ser. N0. 762,286, Sept. 16, 1968, Pat. No. [571 ABSTRACT The method relates to performing surgical procedures on the eye in vivo, including forming of an opening therein to permit the insertion of instrumentation within the eye for various procedures.

16 Claims, 14 Drawing Figures Patented May 2, 1972 3 Sheets-Sheet 1OPTIC NERVE 20 INVENTOR ANTON BANKO N S MN A 55 NM E G Patented May 2, 1972 5 sheets-Shut a INVENTOR. A NTON BAN K0 M 6 I F WW W W a m I I F,

METHOD FOR PERFORMING SURGICAL PROCED ON THE EYE CROSS-REFERENCE TO RELATED APPLICATION BACKGROUND OF THE INVENTION The present invention relates generally to improvements in surgical procedures related to the eye, and more particularly for forming an opening in the eye to permit the insertion of instrumentation therein.

The outstanding and unexpected results obtained by the practice of the method and apparatus of the present invention, are attained by a series of features, steps and elements, working together in inter-related combination, and may be applied to biological organisms in generaland particularly humans, and hence will be so illustrated and described.

Applicant has found that in order to perform various exploratory, diagnostic, or other surgical procedures with respect to the eye, it is necessary for an incision or opening to be formed through the wall thereof such that the instrumentation necessary might be inserted therethrough. When the procedure intended is completed it then becomes necessary to close the opening and permit the incision in the wall of the eye to properly heal such that the eye might function in a proper manner. In applicants copending patent application referred to above, the process of retina reattachment is disclosed, and in which an incision might be formed in accordance with the present invention. To facilitate the discussion of applicants invention dealing with the formation of the incision reference is made to the copending application to merely illustrate one form of surgical procedure that might be conducted after the opening is made as hereinafter described in detail.

By way of illustration and not limitation, once the incision has been made in accordance with the present invention anda passageway formed from the interior to the exterior of the eye then a variety of instruments besides an ultrasonic probe, may be inserted within the passageway to accomplish physical tasks or transmit information to the trained individual from within the eye. For example, a two way bundle of fibers, of which one set is used for the illumination of the interior of the eye and the other set in the bundle is used to carry the image back to the viewer may be utilized. This permits a thorough inspection of the interior of the eye before and after any operation is performed. An instrument may be inserted through the passageway for removing blood clots and other impurities from vitreous material contained within the eye. instrumentation may also be utilized for replacement of lost or spoiled vitreous material. An instrument may be utilized for cutting membranes and bands tracting the retina. An instrument may also be utilized to force the subretinal fluid (vitreous) into the eye, and the retina to settle back against the choroid. An ultrasonic or other cautery for sealing retinal vessels causing hemorrhage into the vitreous or aqueous of the eye may also be used. Essentially, in all of these related illustrated procedures it is necessary that a proper sclerotomy be formed such that after the necessary time is required for carrying out the procedure the incision may be closed to permit a proper healing thereof.

Before proceeding to the details of the invention, let us first review briefly generally known facts of the eye, and the anatomy of the retina. The retina of the eye is attached to the underlying choroid at the optic nerve border posteriorly and at the ora serrata anteriorly. Between these two points it is in contact with but not attached to the choroid. The'retina covers the entire=inner aspect of the eyeball posterior to the ora serrata. The ora serrata is the junction of the retina and the ciliary body, in the average eye it is about 8 mm posterior to the limbus. The retina is composed-of inelastic nerve tissue, consistingof'ten distinct different layers, normally it is'transparent, when detached it appears gray. Most common of retina detachment is the partial separation (detachment) of the retina from'the choroid. The superior temporal part of the retina is most commonly afiected, but any part or even the entire-retina may become detached. According to this invention before the reattachment of the retina may take place an opening must be formed permitting the insertion of the required instrumentation.

OBJECTIVES OF THE-INVENTION method and apparatus 'for performing surgical procedures with respect to the eye.

Anotherobject of the present invention is to provide an improved method and apparatus for forming an incision with respect to the wall of the eye.

Another object of the present invention is to provide an improved method and apparatus to form an incision in the wall of the eye that permits the introduction into the eye of a variety of instrumentations that maybe used for exploratory, diagnostic and surgical procedures.

Another object of the present invention is to provide an improved method and apparatus for opening the eye and subsequently introducing instrumentation therein and maintaining the instrumentation in sealing engagement so as to prevent the loss of vitreous material therefrom.

Other objects and-advantages of this invention will become apparent as the disclosure proceeds.

SUMMARY OF THE INVENTION which various instruments may be inserted within the eye to perform exploratory or-surgical procedures which may be of a diagnostic or therapeutic nature. The sclerotomy or opening that is'forrned is'based on the fact that it is possible with specially designed cutting means and supporting means, assembled together, to insert them through the wall of the eye such that an opening is formed. The cutting element is designed to puncture'the wall,which'is-composed of a number of layers, when a-static 'force is applied thereto. The supporting means has retaining means associated therewith such that in its seated position through the wall it is in interlocking relationship with the wall such that the cutting element may then be disassembled from the supporting means and retracted. The supporting means has a passageway extending therethrough which permits the insertion of various tools and instruments into the eye. The supporting means is provided with one or two conventionally applied sutures-such that it is retained in sealing engagement with the wall to prevent any leakage therethrough. The passageway may contain therein sealing means in the form of an o-ring which is capable of preventing any of the material from flowing thereout as an instrument is inserted therein. 1

The cutting element is designed to have a conically pointed puncturing surface having spaced apart cutting edges such that it has the ability to severe and separate the adjacent wall portions as it is forced through the wall thereof. The cutting element acts as a two edged knife designed to start an incision and enlarge it to the proper length which thereafter continues until the supporting means reaches its seated position and held fast by the retaining means associated with the supporting means.

In practicing the invention, after the completion of the necessary procedure, the supporting means may be removed by first inserting a removing means that may be interlocked with the supporting means and after the sutures are loosened it may be removed by applying a static force outwardly directed from the eye to disengage the retaining means. The removing means also acts to increase the pressure in the eye thus reducing the clamping force around the supporting means, facilitating its removal. The sutures need only be loosened and as the supporting means is retracted they may be progressively tightened to continuously close the adjacent edges of the incision keeping the eye wall in sealed engagement with the outgoing removing means.

BRIEF DESCRIPTION OF THE DRAWINGS Although the characteristic features of this invention will be particularly pointed out in the claims, the invention itself, and the manner in which it may be made and used, may be better understood by referring to the following description taken in connection with the accompanying drawings forming a part hereof, wherein like reference numerals refer to like parts throughout the several views and in which:

FIG. 1, is a somewhat schematic view of an ultrasonic motor generator system for driving a tool member inserted in the eye through an opening formed in accordance with the present invention;

FIGS. 2 and 3, are greatly enlarged views, partly in section, illustrating the formation of an opening through the wall of the eye;

FIG. 4, is a view similar to FIG. 3, showing an instrument extending through the opening into the eye for performing various procedures;

FIG. 5, is a view similar to FIG. 3, showing the removal of the supporting means from within the opening to permit its closing;

FIG. 6, is a side elevational view of the cutting means used to form the opening in the eye;

FIG. 7, is a top view of the cutting means illustrated in FIG. 6; and

FIGS. 8-14, are cross-sectional views taken along the respective section lines in FIG. 7.

DETAILED DISCUSSION OF THE DRAWINGS Referring now to the drawings and particularly to FIG. 1 thereof, we see the schematic representation of aneye 10 having the various portions thereof including aretina 12, in aparticular area 14 with spaced apart detached portions 16 and 18 from thechoroid 20. Thearea 14 is detectable in a conventional manner such that the surgeon is'aware of its location and will conduct the operation with the intent to rejoin the detached portions, or portion, to thechoroid 20 without substantially, if at all injuring the associated parts thereof including thesclera 22. The wall is intended to define any portion of the eye which when pierced will connect the interior of the eye to the exterior and will generally include all, or portions, of the retina l2,choroid 20 andsclera 22, or thesclera 22 andciliary body 24.

Once the partial separation, or detachment of theretina 12 from thechoroid 20 is detected, and this generally occurs with respect to the superior temporal part of the retina which is most commonly affected, but any part or even the entire retina may become detached, then the reattachment of the retina is accomplished in accordance with the teachings of applicant's copending patent application. Briefly this includes first forming an incision or opening 27 in theeye 10, in accordance with the present invention, to permit the insertion of instrumentation in the form of aprobe 30 therethrough to reach the specific area to be treated. Theopening 27, as hereinafter described in greater detail, is capable of being used not only for the reattachment of the retina but for various other operative procedures and uses hereinabove disclosed, both with the eye and other portions of the anatomy and is accordingly so described and intended.

Once theopening 27 is formed theprobe 30, or other instrumentati'on, is inserted therein such that the tip ordistal end 32 thereof, which is the vibratory surface, is positioned within thevitreous material 34 contained in theeye 10 and the vibrational wave energy may be propagated through thevitreous material 34 to obtain a joining or a bonding of the detached portions 16 and 18 to thewall 25, such as thechoroid 20 and thesclera 22. The vibrational wave energy or ultrasonic energy as the terms are herein used, is intended to include vibratory energy in the frequency range of from 1,000 cycles per second to 20,000,000 cycles per second although the preferable range is generally from 10,000 cycles "per second to l ,000,000 cycles per second.

Refem'ng further to FIG. 1, it will be seen that the instrumentation in the form ofprobe 30 for ultrasonically performing surgical procedures on a biological organism, such as a human, may include an ultrasonic transducer or motor 35 for effecting the necessary high frequency vibrations of the vibratory element ortool member 36 with the distal end oroutput surface 32 transmitting the vibrations. The ultrasonic motor 35, as illustrated may be in the form of a driving member adapted for being hand held as by anoperator 38, and generally comprising a tubular housing or casing 40 into which an insert unit supporting thevibratory element 36 may be partially telescoped. The ultrasonic motor 35 is energized by anoscillation generator 42, with apower cable 44, connecting the two together. The generator is an oscillator adapted to produce electrical energy having ultrasonic frequency.

The ultrasonic motor 35 may be one of a variety of electromechanical types, such as electrodynamic, piezoelectric or magnetostrictive. The ultrasonic motor for effecting surgical procedures through hand directed tools of suitable configuration, may be of the type which are readily replaceable or interchangeable with other work performing tools in acoustically vibrated material treating devices, and each work tool member is rigidly joined, in end-to-end relationship to a connecting body or acoustic impedance transformer and to a transducer which may form an insert unit or assembly which is removably supported in a housing containing a coil in surrounding relationship to the transducer and receiving alternating current for producing an alternating electromagnetic field;

The transducer in the ultrasonic motor 35 is longitudinally dimensioned so as to have lengths which are whole multiples of half wavelengths of the compressional waves established therein at the frequency of the biased alternating current supplied so that longitudinal .loops of motion as indicated by arrow 45, occur with maximum displacement at thedistal end 32 of thevibratory element 36 that is rigidly connected to the insert unit. Thus, the optimum amplitude of longitudinal vibration and hyper-accelerations ofvibratory element 36 is achieved, and such amplitude is determined by the relationship of the masses on both sides of the nodal region of the vibratory element which may be made effective to either magnify,or reduce the amplitude of the vibrations received from the transducer.

Thegenerator 42 is provided with a control means, for setting the time of duration of the energy by adjusting thedial 47. Forpower adjustment dial 49 is provided which controls the amount of power delivered to the ultrasonic motor. The vibratory stroke of theoutput surface 32 of thevibratory element 36 is controlled by manual setting of thepower dial 49 on the generator.

Thevibratory probe 30 is provided with guard means 46 that may be secured to thecasing 40 of the motor 35 in any conventional manner and which may be in the form of atubular member 51 mounted in coaxial alignment with thevibratory element 36 and designed to provide clearance around the vibrating surface in order to prevent rubbing between the vibratory element and the housing when the tip is vibrating, thus, preventing generation of heat due to friction. Theprotective tubing 51 also serves as an insulator or as a reflector to prevent ultrasonic energy being radiated except from theoutput surface 32. Theprotective tubing 51 may extend the length of thevibratory element 36 or beyond it if desired and also serves to support the front part of theultrasonic probe 30.

Having thus briefly described one form ofinstrumentation 30 that may be utilized to perform operative procedures on the eye, it is seen that anopening 27 is first required to be formed on thewall 25 of theeye 10, which may be over the pars plana, and that as illustrated in FIG. 1, supportingmeans 50 be provided to extend through theopening 27 to lend support to theinstrumentation 30 extending therethrough. As seen with respect to FIGS. 2-5, theopening 27 extends through thesclera 22 andciliary body 24 over the most convenient region of the pars plana.

The supporting means 50, which may be of a metallic or thermoplastic material, as seen with respect to FIGS. 2-5, extends through thewall 25 and is positioned in and tightened in the incision or opening 27 by adouble mattress suture 52. The support means 50 should have the ability to rotate within theopening 27. To provide a seal with theprotective tubing 51 and facilitate its sliding, the supportingmember 50 should have a minimum outside diameter to be inserted into theincision 27, and possibly supported and rotated by a micromanipulator. Finally the supportingmember 50 should eventually provide for an increase in volume of the vitreous cavity in order to reduce the pressure in theeye 10, during the operation. The supporting means 50 comprises atubular body portion 53 which may be of circular cross-sectional area so that it may be rotatable after it is seated through thewall 25 of the eye and includes apassageway 54 connecting the interior of the eye to the exterior, and extending from thefront end 56 to therear end 58, which rear end has an upperannular flange 60 extending radially outwardly from thebody portion 53 proximate the upper end thereof and adapted to overlap the outer surface of theeye 10. A lowerannular flange 62 is provided extending radially outwardly from thebody portion 53 proximate the lower end thereof and adapted to extend over the inner surface of thewall portion 25. The spacing between the flanges forming retaining means 63 in the form of agroove 64, which as illustrated is adapted to retain thewall portion 25 of theeye 10 in fixed position.

Thepassageway 54 should be of sufficient volume for retreat of the vitreous material from the tense eye without the possibility of it running out and being lost. Sealing means 65 is provided in thepassageway 54 to prevent any of the internal fluids of the eye from flowing out when theinstrument 30 extends through thepassageway 54. The sealing means 65 may include a seat or groove 66 containing a sealingmember 68, which may be in the form of an o-ring to provide the sealing engagement with any element inserted within thepassageway 54. Due to the viscosity of the vitreous material a close tolerance at one point in THEpassageway 54 with theprotective tubing 51, or other instrument, may be sufficient to provide the sealing engagement.

The supporting means 50 has mounted coaxially therewith cutting means in the form of cuttingelement 70 which includes anenlarged head section 72, adapted to be coupled to an instrument if desired, and having abase section 74 extending through thepassageway 54 and terminating in a cuttingsurface 76 of a selected configuration. Locking means 78 is provided between the supportingmeans 50 and cutting means 70 to releasably connect them together and permit the removal of the cutting means 70 after the supportingmeans 50 has penetrated thewall 25 and is held in place by the retaining means 63. The locking means 78 may be in the form of apin 80 extending from thebase section 74 into a cooperatinggroove 82 contained within thepassageway 54 to prevent angular rotation between said respective means during their in-' sertion into the eye in the direction ofarrow 84.

The cutting means 70, which may be of a metallic material, is illustrated in greater detail in FIGS. 6-14, and is seen to include thehead section 72 that may be integrally formed with thebase section 74 terminating in a cuttingsurface 76 including spaced apart cuttingedges 77, approximately 180 apart, that are joined at one end at the pointedtip 79 and progressively taper outwardly therefrom until merging in thebase section 74 having a circular cross-section as seen in FIG. 14. The

forward end of thebase section 74 terminates in a conically taperedsection 81 that blends with the cutting edges 77. Although twocutting edges 77 have been shown on a common plane, one, or more than two, cutting edges may also be used, and spaced apart in any selective pattern. The cutting edges 77 are contained on thebase section 74 beyond the supportingmeans 50 such that the cuttingsurface 76 will first penetrate thewall 25 to form theopening 27 for receiving the supportingmeans 50 in seated position within the opening.

In actual practice the combined supporting means 50 and cutting means 70 are releasably coupled together as a unit and inserted in the direction ofarrow 84 as seen in FIG. 2, such that the cuttingsurface 76 first pierces thewall 25 and is moved axially forward until the position in FIG. 3 is reached with the supportingmeans 50 positioned in theopening 27 that is formed by the cuttingsurface 76. The contour of the cuttingsurface 76 being pressed into theeye 10 is of increasing cross-section and designed as a conical shape until it embraces thegroove 64 of the supportingmeans 50. Thelower flange 62 has a roundededge 86 and tapered front such as to continue essentially the taper of the cuttingsurface 76, as it is forced through thewall 25. Once the position in FIG. 3, is reached thewall 25 extends within thegroove 64 thereby retaining the supportingmeans 50 in fixed position against axial movement and the twomattress sutures 52 may be conveniently tightened in surrounding relation so as to prevent any of the vitreous material from flowing out and providing sealing engagement between the supportingmeans 50 andwall 25.

The cuttingelement 70 can now be withdrawn, by disengaging or unlocking the locking means 78 and removing the cuttingelement 70 in the direction ofarrow 85, leaving thepassageway 54 open and in which case part of the vitreous material will tend to flow therein. It is now possible to insert through thepassageway 54 different tools andinstruments 30 which normally could be attached to a solid structure like a micromanipulator, which will provide the stability and a Supporting point for the front of the instrument, thus relieving the strain on the surgeon's hand.

Removal of the supporting sleeve, when required, is accomplished, as seen in FIG. 5, by inserting removingmeans 87 which may include an enlargedrear section 88 that may be gripped by a surgical device, and a front section 89 adapted to extend within thepassageway 54 with a tapered front end, to minimize damage on the eye tissue during the withdrawal of the supportingmeans 50 by providing a smooth and gentle removal. During this latter process, an additional or the same pair of mattress sutures 52 are to be gradually tightened as the supportingmeans 50 and removingmeans 87 are gradually removed from thewall 25 to close up theopening 27. The locking means 78 is used to retain the removingmeans 87 and supportingmeans 50 coupled together during their removal from the wall.

As discussed above the puncturing or cuttingelement 70 is a pointed two edged knife, designed to start an incision and enlarge it to the proper length in the desired direction, the direction is defined by the positioning pin contained thereon. An advantage of reinserting of a conically pointed rod into thepassageway 54 before the removal of the supportingmember 50 is that it forces the vitreous material from thepassageway 54 back within to the eye. Insertion of the rod into the eye increases the pressure in the eye, thus reducing the clamping force around the supporting member, facilitating its removal.

Accordingly, once the supportingmember 50 is in place, as seen in FIG. 4, guard means 46 is in sealing engagement with the o-ring 68 and thevibratory element 36 extends therethrough and as seen by thearrow 48 the support member may be angularly tilted such that the distal end thereof may be properly manipulated to the desired position for propagating the energy waves.

Many other changes could be effected in the particular constructions, and in the methods of use and construction, and in specific details thereof, hereinbefore set forth, without substantially departing from the invention intended to be defined herein, the specific description being merely of embodiments capable of illustrating certain principles of the invention.

1 claim:

l. The method of positioning instruments within the eye comprising the steps of:

Positioning a supporting means having a passage therethrough adjacent a selected area of the outer wall of the eye,

Moving a cutting means into the wall of the eye within said selected area to pierce said wall and form an opening therein,

Moving said supporting means with said cutting means into said opening so that a portion of said supporting means extends through the wall of the eye to provide access for an instrument into the interior of the eye through the passageway of said supporting means.

2. The method of claim 1 further comprising the step assembling the cutting means to the supporting means to move therewith prior to moving said cutting means into the wall of the eye so that said cutting means and supporting means can be moved together, and moving said cutting means and said supporting means so that said cutting means first forms the opening and the supporting means is. thereafter moved through said opening.

3. The method ofclaim 2 wherein said assembling step comprises placing said cutting means through the passageway of said supporting means.

4. The method of claim 3 further comprising the steps of withdrawing said cutting means through said passageway of said supporting means and inserting an instrument into the eye through said passageway.

5. The method of claim 1 further comprising the step of mounting said supporting means to the wall of the eye.

6. The method according to claim 3 further comprising the steps of releasably locking said cutting means to said supporting means with said cutting means positioned within said passageway of said cutting means and having a cutting surface extending beyond the front of said supporting means, and moving said assembled cutting means and supporting means to first force the cutting surface of said cutting means into the wall of the eye to penetrate the wall to form the opening for receiving said supporting means and then move the supporting means into the opening.

7. The method according to claim 6 further comprising the steps of:

unlocking said cutting means from said supporting means,

removing said cutting means from said passageway, and inserting instrumentation through said passageway into the interior of the eye. g

8. The method according to claim 1 further comprising the step of retaining said supporting means in fixed axial position relative to the wall of said eye.

9. The method according to claim 1 further comprising the step of forming a seal between the opening formed by said cutting means and the supporting means extending therethrough to prevent the escape of the vitreous material contained within the eye through said opening.

10. The method according to claim 9 wherein the step of forming said seal includes applying at least one suture through the wall of the eye in surrounding relation to said supporting means.

1 l. The method according to claim 1 further comprising the steps of:

a. inserting an instrument through said passageway, and

b. sealing said instrument within said passageway to prevent the escape of the vitreous material contained within the eye through said passageway.

12. The method according to claim 11 further comprising the steps of:

a. removing said instrument from within said passageway,

b. inserting in said passageway means for removing said supporting means, and c. moving said removing means outwardly from the eye for disengaging said supporting means from the wall of the eye.

13. The method of positioning instrumentation within the eye utilizing cutting means having a cutting surface, and supporting means having a passageway extending therethrough, comprising the steps of: i

A. releasably assembling said cutting means with said supporting means such that said cutting means extends within said passageway and said cutting surface extends beyond the front end of said supporting means,

B. forcing said assembled supporting means and cutting means through the wall of the eye with said cutting surface first penetrating the wall of the eye to form an opening therein, and continuing said force until said supporting means extends through the wall of the eye,

C. disassembling said cutting means from said supporting means,

D. removing said cutting means from said passageway, and

E. inserting through said passageway the instrumentation.

14. The method according toclaim 13, and including the step of sealing said instrumentation within said passageway to prevent the escape of the vitreous material contained within the eye through said passageway.

15. The method according toclaim 13, and including the steps of:

a. removing said instrumentation from within said passageway,

b. inserting in said passageway removing means in sealing engagement therewith, and

c. disengaging said supporting means from the wall of the eye.

16. The method according toclaim 13, and including the step of forming a seal between the opening and the supporting means extending therethrough to prevent the escape of the vitreous material contained within the eye through said openmg.

Claims (16)

1. The method of positioning instruments within the eye comprising the steps of: Positioning a supporting means having a passage therethrough adjacent a selected area of the outer wall of the eye, Moving a cutting means into the wall of the eye within said selected area to pierce said wall and form an opening therein, Moving said supporting means with said cutting means into said opening so that a portion of said supporting means extends through the wall of the eye to provide access for an instrument into the interior of the eye through the passageway of said supporting means.

2. The method of claim 1 further comprising the step assembling the cutting means to the supporting means to move therewith prior to moving said cutting means into the wall of the eye so that said cutting means and supporting means can be moved together, and moving said cutting means and said supporting means so that said cutting means first forms the opening and the supporting means is thereafter moved through said opening.

3. The method of claim 2 wherein said assembling step comprises placing said cutting means through the passageway of said supporting means.

4. The method of claim 3 further comprising the steps of withdrawing said cutting means through said passageway of said supporting means and inserting an instrument into the eye through said passageway.

5. The method of claim 1 further comprising the step of mounting said supporting means to the wall of the eye.

6. The method according to claim 3 further comprising the steps of releasably locking said cutting means to said supporting means with said cutting means positioned within said passageway of said cutting means and having a cutting surface extending beyond the front of said supporting means, and moving said assembled cutting means and supporting means to first force the cutting surface of said cutting means into the wall of the eye to penetrate the wall to form the opening for receiving said supporting means and then move the supporting means into the opening.

7. The method according to claim 6 further comprising the steps of: unlocking said cutting means from said supporting means, removing said cutting means from said passageway, and inserting instrumentation through said passageway into the interior of the eye.

8. The method accordIng to claim 1 further comprising the step of retaining said supporting means in fixed axial position relative to the wall of said eye.

9. The method according to claim 1 further comprising the step of forming a seal between the opening formed by said cutting means and the supporting means extending therethrough to prevent the escape of the vitreous material contained within the eye through said opening.

10. The method according to claim 9 wherein the step of forming said seal includes applying at least one suture through the wall of the eye in surrounding relation to said supporting means.

11. The method according to claim 1 further comprising the steps of: a. inserting an instrument through said passageway, and b. sealing said instrument within said passageway to prevent the escape of the vitreous material contained within the eye through said passageway.

12. The method according to claim 11 further comprising the steps of: a. removing said instrument from within said passageway, b. inserting in said passageway means for removing said supporting means, and c. moving said removing means outwardly from the eye for disengaging said supporting means from the wall of the eye.

13. The method of positioning instrumentation within the eye utilizing cutting means having a cutting surface, and supporting means having a passageway extending therethrough, comprising the steps of: A. releasably assembling said cutting means with said supporting means such that said cutting means extends within said passageway and said cutting surface extends beyond the front end of said supporting means, B. forcing said assembled supporting means and cutting means through the wall of the eye with said cutting surface first penetrating the wall of the eye to form an opening therein, and continuing said force until said supporting means extends through the wall of the eye, C. disassembling said cutting means from said supporting means, D. removing said cutting means from said passageway, and E. inserting through said passageway the instrumentation.

14. The method according to claim 13, and including the step of sealing said instrumentation within said passageway to prevent the escape of the vitreous material contained within the eye through said passageway.

15. The method according to claim 13, and including the steps of: a. removing said instrumentation from within said passageway, b. inserting in said passageway removing means in sealing engagement therewith, and c. disengaging said supporting means from the wall of the eye.

16. The method according to claim 13, and including the step of forming a seal between the opening and the supporting means extending therethrough to prevent the escape of the vitreous material contained within the eye through said opening.

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