CA2081077A1 - Electrosurgial instrument with extendable sheath for irrigation and aspiration - Google Patents

Electrosurgial instrument with extendable sheath for irrigation and aspiration

Info

Publication number
CA2081077A1
CA2081077A1 CA002081077A CA2081077A CA2081077A1 CA 2081077 A1 CA2081077 A1 CA 2081077A1 CA 002081077 A CA002081077 A CA 002081077A CA 2081077 A CA2081077 A CA 2081077A CA 2081077 A1 CA2081077 A1 CA 2081077A1
Authority
CA
Canada
Prior art keywords
sheath
electrode
distal end
electrosurgical instrument
irrigation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
CA002081077A
Other languages
French (fr)
Inventor
David J. Parins
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Everest Medical Corp
Original Assignee
Everest Medical Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Everest Medical Corp filed Critical Everest Medical Corp
Publication of CA2081077A1 publication Critical patent/CA2081077A1/en
Abandoned legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
    • A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
    • A61B18/14—Probes or electrodes therefor
    • A61B18/1482—Probes or electrodes therefor having a long rigid shaft for accessing the inner body transcutaneously in minimal invasive surgery, e.g. laparoscopy
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
    • A61M1/84—Drainage tubes; Aspiration tips
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
    • A61M1/84—Drainage tubes; Aspiration tips
    • A61M1/85—Drainage tubes; Aspiration tips with gas or fluid supply means, e.g. for supplying rinsing fluids or anticoagulants
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00053—Mechanical features of the instrument of device
    • A61B2018/00184—Moving parts
    • A61B2018/00196—Moving parts reciprocating lengthwise
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M3/00—Medical syringes, e.g. enemata; Irrigators
    • A61M3/02—Enemata; Irrigators
    • A61M3/0279—Cannula; Nozzles; Tips; their connection means

Abstract

ELECTROSURGICAL INSTRUMENT WITH
EXTENDABLE SHEATH FOR IRRIGATION AND ASPIRATION
ABSTRACT OF THE DISCLOSURE

An electrosurgical instrument having a protective, extendable and retractable sheath or sleeve is disclosed.
The sheath is disposed around and coaligned with an elongated cylindrical rod, from which extends at least one electrode. A conductor extending from the electrode is joined to a conventional power supply cord for connection to a source of RF voltage. Power supply is regulated using either a conventional hand or foot switch.
The sheath protects the distal electrode(s) as the instrument is inserted through a laparoscopic trocar or endoscope. It also provides an effective extension of an irrigation/aspiration lumen which extends along the length of the cylindrical rod. The proximal end of the irrigation/aspiration lumen is joined to a supply tube which either may be connected to a fluid reservoir for irrigation or to a collection reservoir for aspiration of fluids. Alternative embodiments feature alternative mechanisms for extending the sheath. In one embodiment, the sheath is retractable and shields the electrode(s) only when placed in a distal, extended position. When this sheath is disposed proximally, the electrode is exposed for use. When the sheath is disposed distally, it permits fluid travelling through the irrigation lumen to be delivered more precisely to a region of tissue, because the projection of the electrode no longer interferes with placement. In another embodiment, the cylindrical rod-shaped housing on which the electrode resides is retractable. When the cylindrical rod is withdrawn to a proximal, retracted position with the sheath, it shields the electrode and extends the effective end of the irrigation lumen.

Description

.Q~7 ELECTROSURGICAL INSTRUMENT WITH
EXTENDABLE SHEATH FOR IRRIGATION AND ASPIRATION
BACKGROUND OF THE INVENTION
I. Field of the Invention This invention relates generally to the design of electrosurgical instruments and more particularly to a monopolar or bipolar electrosurgical in~trument having an extendable lumen which permits selective irrigation and aspiration of the treatment region. In one embodiment, a ~heath is reciprocally moveable in relation to the main housing of the electrosurgical instrument and features at least one pressure release port at its distal end to reduce the amount of suction provided to tissue. In an alternative embodiment, a tubular housing having at least one distal electrode extending therefrom is reciprocally movable within a stationary, external sleeve.
II. Discussion of the Prior Art Monopolar and bipolar electrosurgical instruments typically include an eleatrode extending from a distal end of a rigid or flexible tube. In these instruments, it is desirable to inolude a lumen with a distal exit port positioned near the electrodes to 6upply irrigation fluid and to aspirate that fluid and debris from the region. Although electrodes used on the~e instruments are configured for optimal contact with tissue, the fact that they generally pro~ect outwards make~ it difficult to manipulate the distal end of the device to position an irrigation/aspiration port ad~acent to tis~ue, in order to selectively flu~h ons area of a treatment region or to aspirate blood or bodily fluids from the region.
Although it is common to inalude a suction or irrigation lumen within such instruments, the port i8 often ; displaced too far from tissue to be optimally effective.
This obstruction occurs even when the slectrodes are specially dimensioned to enhance irrigation and 2~ 7 aspiration. Furthermore, these instruments are typically inserted through the lumen of a laparoscopic trocar or endoscope, within which the protruding electrode~s may be damaged as the instrument is negotiated through bends and curvee in the lumen.
The present invention 601ves these problems presented in the prior art by providing a retractable or extendable sleeve or sheath which may be extended distally in relation to the surface holding the electrodes and which, when extended, encompa6ses the electrode housing and electrodes of the electrosurgical instrument. When extended, the sleeve protects the electrodes during insartion and also functions as an extension of the suction and irrigation port. Thus, when extended, the point at which suction takes place is provided closer to the actual treatment site than was possible using prior art instruments. Alternatively, the housing on which the electrodes are mounted may be retracted into a stationary sleeve, again enabling the orifice of the irrigation/aspiration tube to be effectively placed nearer a treatment region than was possible in the prior art.
It is accordingly a principal ob~ect of the pre~ent invention to provide a new and improved electrosurgical instrument for insertion into a laparo~copic trocar or endos~ope.
Another ob~eot of the present invention le to provide a new and improved apparatus for irrigation and aspiration of a treatment region featuring a retractable and extendable ~heath to enable application of irrigation and aspiration nearer a treatment region.
It i~ yet another object of the present invention to provide a new and improved apparatus for irrigation and aspiration of a treatment region featuring a retractable 2~ 7 and extendable electrode hou~ing which may be withdrawn into a stationary sheath to enable application of irrigation and aspiration nearer a treatment rejgion. A
further object of the present invention i8 to provide a new and improved apparatus for attaining a level of controlled suction which will not damage tissue by grasping it too strongly.
A still further ob~ect of the present invention iB
to provide a new and improved apparatus having a sheath ; 10 which acts aB a protective sleeve as the instrument is inserted through a laparoscopic trocar or endoscope.
SUMMARY OF ~HE INVENTION
The present invention provides an electrosurgical instrument having an extendable protective sleeve or sheath which encompasses the distal end of the instrument to protect its electrodes as the instrument is fed through a laparoscopic trocar or endoscope and to provide an effective extension of an irrigation/aspiration lumen.
Extension of this sheath in the distal direction moves it to a po~ition which encompasses or ~hields the electrodes. Extension of the sheath also provides a tube through which irrigation fluid may be directed or which provide~ suction at a precise 8itQ. Thus, the protruding electrode~ no longer interfere with the efficacy of aspiration or irrigation of the treatment region as they do in prior art devices. A plurality of small holes dispen~ed along the sleeve provide relief during aspiration 80 that the tissue is not grasped too strongly while being treated.
Alternatively, the housing on which the distal electrodes are mounted may be retracted into a relatively rigid stationary sleeve. In either embodiment, the protruding electrodes no longer interfere with placement of the irrigation/aspiration port into the treatment .... . . . ... .

region.
The aforementioned ob~ects and advantages of the invention will become subse~uently apparent and jreside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming a part thereof, wherein like numerals refer to like part~ throughout.
DESCRIPTION OF THE DRAWINGS
Figure 1 shows a cross-sectioned view of a prior art electrosurgical instrument;
Figure 2 ~hows a partial, s~de elevation view of a preferred embodiment of the present invention;
Figure 3 shows a partial, cross-sectioned side view of the embodiment of Figure 2;
Figure 4 6how~ a partial, cross-sectioned side view of a bipolar electrode distal tip arrangement including the present invention; and Figure 5 shows a partial, cross-sectioned 6ide view of an alternatlve embodiment of the present invention.
DES~RIPTION OF THE PREFERRED ENBODIMENT
Figure 1 shows a partial, cross-sectioned view of a prior art electrosurgical instrument having at least one electrode extending from a distal 6urface. This electrosurgiaal instrument, generally depicted as 10, typically includes a tubular member 12 having a proximal end 14 and a distal end 16. Extending from a distal surfaae 1~ i~ at lea~t one conductive electrode 20 havlng a flexible conductor means 22 extending from an RF
voltage source (not shown). A lumen 24 extends through tubular member 12 and terminates at a distal port 26 in the region of electrode 20 on di~tal surface 18. The port 26 is u ed for irrigation and aspiration of the treatment region. Irrigation is nece6sary to periodically clean~e the treatment region with fluid from .
..
_. . . .. .. ~ .

2~ 77 a reservoir (not shown). Aspiration is necessary to remove blood and bodily fluids from discrete regions of the tissue surface before treatment can continue.
Although placed near electrode 20 in prior art devices, the irrigation/aspiration port 26 i~ nevertheless generally displaced too far from the tissue to be treated to be optimally effective. In other words, more accurate placement of the irrigation/aspiration port i5 frequently desired but not attainable due to obstruction caused by lo the projecting electrodes 20. For example, interference from the projection of the electrode permits only general flushing of the surrounding tissue, not selective flushing of a precise site.
Figure 2 shows an electrosurgical instrument 30 constructed in accordance with the present invention. It incorporates a protective sheath 32 rigidly affixed to an extender member 34 mounted on a hou~ing 36. Dlstal and proximal movement of extender member 34 causes sheath 32 to be displaced distally or proximally. Thus, extender member 34 may be displaced proximally, as indicated at 38 (in shadow), to withdraw the distal end 40 of sheath 32 to a proximal position 42. Extending from the underside of housing 36 is a hand grip 44 enclosing a tubular aspiration/irrigation member (Figure 3). Extending from the proximal end of housing 36 is a power cord 46 having a plug 48 which is adapted to be ~oined to a conventional RF voltage source (not shown) to energize the electrosurgiaal in~trument. A power switch, generally designated 50, controls voltage supply to the instrument in the known manner. For example, when knob 52 is positioned at proximal location 54, the instrument is turned o~, but when it is positioned distally (56, in shadow), it i6 turned on. Alternatively, it may be controlled by a conventional foot switch (Figure 5). One 2 ~ 7 or more ports 82 are di6posed at the distal end of ~heath 32 to moderate the amount of suction through the sleeve, as discussed more fully hereinafter.
Figure 3 chows a plan, cross-~ectional view of the electro6urgical instrument of Figure 2. In this view, it is apparent that sheath 32 ig generally tubular shaped, having a proximal end 58 and a distal end 60. Sheath 32 is preferably formed of eemi-rigid plastic material. It is also apparent from this view that sheath 32 Burrounds lo cylindrical rod 62. Rod 62 i~ prefsrably also formed from a rigid plastic and includes an insulating distal surface 64, having at least one elactrode 66 extending therefrom. Electrode 66 is preferably a hook-shaped tungsten, tung6ten alloy or stainless steel rod or tube, but its distal end may be formed in a variety of shapes, as disclosed in the co-pending application Serial No.
07/728,337, assigned to applicant's assignee. A lumen 68 is molded, drilled or otherwise formed lengthwise through the rod to receive the straight leg portion 70 of the electrode 66, which is joined at its proximal end 72 to a wire 74. The wire 74 ~oins electrode 66 to switch 50 and, thus, to RF power (not shown). Rod 62 further includes a suction and/or irrigation lumen 76 which extends the full length of the rod 62. At the distal end 25of suction/irrigation lumen 76 i8 an entry/exit port 78.
At its proximal end, the irrigation/aspiration lumen 76 iS joined to a tubular fluid delivery lumen 80, which ; extends to a fluid 60urce ~not shown). This same source can also be used as a reservoir to collect aspirate.
30Positioned near the distal end of sheath 32 is at least one pressure reliaf port 82. Although a preferred - placement that would suffice for most applications requires that two of these ports be placed at a radial distance of about 180, it is envisioned that as few as 2~ ~ .Q77 one port or as many as permitted without compromising the structural integrity of the sheath 32 may be required for some applications. It is suggested that these ports have a diameter of approximately 30/looo of an inch, although one skilled in the art will recognize that the particular application will determine the desirable port size and number. The ports 82 provide relief so that suction is not applied to the surrounding tissue with too much force, causing tissue damage by grasping the tissue too strongly.
In the view of Figure 3, the internal con~truction of extender member 34 becomes apparent. Its cylindrical internal surface 84 further includes voids 86 and 88 dimensioned for receiving detents 90 and 92. In a retracted, proximal position, void 86 mates with detent 90 and void 88 mate~ with detent 92. In an extended, distal position, void 86 mates with detent 92 and void 88 is not occupied. An o-ring 94 of rubber or other elastomeric material provides a pneumatic seal between sheath 32 and rod 62. Preferably, the O-ring 94 is positioned at the di~tal end of rod 62 to prevent leakage toward extender member 34.
Figure 4 ic included to demonstrate that the irrigation/aspiration sheath of the present invention may be used with most commonly practiced tip embodiments. In particular, a pair of bipolar electrodes 96 and 98 are shown encompassed within sleeve or sheath 100 and ~oined to conductors 102 and 104. Sleeve or sheath 100 is analogous in construction to sheath 32. In this embodiment, irrigation/aspiration port 106 is positioned at the distal end of lumen 108. Lumen 108 mates with a fluid delivery means, in a manner similar to the embodiments of Figures 2 and 3.
In operation, the extender member 34 i~ advanced . ' .
.

.`L.~J ~ 7 distally until detent 90 i~ locked within void 86, and electrode 66 is surrounded and shielded by distal end 60 of the sheath. This end is then inserted; into a laparoscopic trocar or endoscope until it is positioned within a body region to be treated. Prior to application of RF voltage to electrode 66 as previously described, the 6heath 32 mu3t first be retracted, as at 42 in Figure 2, whereupon detent 94 i~ locked within void 86. After tissue has been electrosurgically treated and it is desired to, for example, flu~h the treatment region to remove debris, the extender member 34 is again moved distally, causing aheath 32 to encompa~s electrode 66.
Fluid i6 withdrawn from a reservoir (not shown) and projected through tubular fluid delivery lumen 80 and through lumen 76, then emitted through port 78, whereupon it flows freely through the treatment reglon.
It i~ frequently desired at this time to aspirate the flush fluid from the region. Fluid delivery lumen 80 is then connected to a suation ~ourae (not ~hown), whereupon flush fluid and debris iB withdrawn into the distal end 60 of sheath 32, and through port ~8, lumen 76, and tubular fluid delivery means 80 into a conventional reservoir (not shown). ~he sheath 32 may then be withdrawn by proximal movement of extender member 34 to once again expose the eleatrode 66 to enable further electrosurgery.
In application~ ~uah a~ thoae previously de~aribed, one 6killed in the art will recognize that in addition to regulating the degree of suction applied to a treatment region, the ports ~2 also aid in di~persal of flush fluid as it exlts the irrigation/aspiration port 78.
Figure 5 shows a cros~-sectional view of an alternative embodiment of the present invention, generally designated 110. As with the embodiment of 2~ L.~r~7 Figures 2 through 4, it may be included on a monopolar or a bipolar instrument. A rigid plastic protective sleeve 112, having a di6tal end 114 and a proximal end 116, is secured to a housing 118. A cylindrical rod 120 supports 5 at least one electrode 122, which extend~ from the rod at a distal surface 12~. At its proximal end, the rod 120 i6 joined to an extender member 126. Distal movement of the extender member 126 within slot 128 shifts the proximal end of the rod 120 from a proximal position 130 to a distal position 132, until the distal 6urface 124 aligns with the opening 134 at the distal end 114 of the sleeve, thus enabling electrode 122 to protrude from within sleeve 112.
The electrode 122 may be formed from tungsten, tungsten alloy, or a curved stainless steal rod or tube, which is inserted into a lumen 136 drilled or otherwise formed lengthwise within rod 120. As described previously for the embodiment of Figure~ 2 through 4, the electrode 122 is likewi6e joined at 138 to a conductive wire 140. Wire 140 i6 joined to power supply cord 142, leading to a source of RF voltage 144. Power 6upply may be controlled by a conventional foot switch 146, or by a hand switch (not shown), as de~cribed in reference to Figure 2. An irrigation/aspiration lumen 148 i8 also drilled or formed lengthwise through rod 120 from an open end 150. The proximal end of lumen 148 is ~oined to a tubular fluid duct 152, connected to a container 154, which may alternatively be a fluid reservoir or an a6pirate receptacle. An elastomeric 0-ring 156 prevents leakage between rod 120 and sleeve 112. Preferably, 0-ring 156 is formed from silicone rubber.
The electrosurgical inE;trument of the present invention can be fabricated from a variety of available materials. For example, various medical grade plastics z~ 77 may be employed in molding the housings 36 and 118, with polycarbonate being preferred. The tubular sleeves 32 and 112 may be extruded polyethylene, polyurethane, polypropylene or Teflon~, with Teflon being preferred.
The electrode conductors 74, 102, 104 and 140 are preferably formed from braided ~trands of ~tainless steel, although other materials may be used as well.
They may be i~olated from one another in traversing the length of the rods 62 and 120, but if not isolated, they must themselves be coated with an insulator.
Thi~ invention has been de6cribed herein in considerable detail in order to comply with the Patent Statutes and to provide those skilled in the art with the information needed to apply the novel principle6 and to construct and use such specialized components as are re~uired. However, it is to be understood that the invention can be carried out by ~peaifically different equipment and devices and that various modifications, both as to equipment details and operating pr~cedures, can be accomplished without departing from the scope of the invention itself.
What is claimed is:

_. ,. , A... ':... . ' ~ ' . .

Claims (19)

1. An electrosurgical instrument comprising:
(a) an elongated tubular member having a proximal end, a distal end and a lumen extending therebetween;
(b) electrode means affixed to said distal end of said tubular member and projecting distally therefrom for electrosurgical cutting of tissue;
(c) means for creating a suction force at the distal end of said elongated tubular member by applying a negative pressure at the proximal end of said lumen;
and (d) means for selectively extending said suction force beyond said distal end of said tubular member.
2. The electrosurgical instrument as in Claim 1, wherein said means for selectively extending said suction force comprises:
a tubular sheath having a distal end coaxially disposed and longitudinally slidable relative to said tubular member.
3. The electrosurgical instrument as in Claim 2, wherein said tubular sheath can be moved from a first position wherein said distal end thereof is retracted to expose said electrode means to a second position wherein said distal end projects distally beyond and in covering relation relative to said electrode means.
4. The electrosurgical instrument as in Claim 3, wherein said tubular sheath is effectively pneumatically sealed relative to said tubular member.
5. The electrosurgical instrument as in Claim 3, further including detent means disposed between said tubular member and said tubular sheath for establishing said first and second positions.
6. The electrosurgical instrument as in Claim 1, wherein said means for selectively extending said suction force comprises:
(a) a tubular sheath having a distal end coaxially disposed relative to said elongated tubular member; and (b) a means for retracting said tubular member from a first position wherein said electrode means is exposed and projects distally relative to said distal end of the sheath, to a second position wherein said electrode means is retracted to lie in covered relation to said sheath.
7. The electrosurgical instrument as in Claim 6, wherein said tubular sheath is effectively pneumatically sealed relative to said tubular member.
8. The electrosurgical instrument as in Claim 1, further including at least one pressure relief port disposed along said means for extending suction force.
9. The electrosurgical instrument as in Claim 1, further including:
a hand switch means for controlling the supply of RF voltage to said electrode means.
10. The electrosurgical instrument as in Claim 1, further including:
a foot switch means for controlling the supply of RF voltage to said electrode means.
11. An electrosurgical instrument having a protective sleeve comprising:
(a) a housing means for grasping by a surgeon, said housing having a distal end and a proximal end (b) a rod means for supporting an electrode, said rod means having a distal surface and a proximal end and at least one lumen disposed therebetween, and affixed at said proximal end to said distal end of the housing;

(c) at least one electrode means for cutting tissue having a proximal end, said proximal end inserted at said distal surface into said lumen in said rod means and extending distally therefrom:
(d) an irrigation and aspiration lumen having a distal end and a proximal end and disposed within said cylindrical rod between said distal surface and said proximal end of the housing;
(e) a sheath means for protecting said electrode, said sheath means having a distal end and a proximal end and coaxially disposed about said rod means, and affixed at said proximal end of the sheath means to said distal end of the housing; and (f) an actuator means coupled to said sheath means, for reversibly causing said sheath means to protect and to expose said electrode means, said actuator means being moveable to a first position wherein said sheath means is in covering relation to said electrode means and moveable to a second position wherein said electrode means extends beyond said distal end of the sheath means and is exposed.
12. The electrosurgical instrument as in Claim 11, wherein:
said actuator means is moveable to cause said sheath means to be moved from a first position wherein said distal end of the sheath is in covering relation to said electrode means, to a second position wherein said distal end of the sheath means is retracted to expose said electrode means.
13. The electrosurgical instrument as in Claim 12, further including detent means disposed between said rod means and said sheath means for establishing said first and second positions.
14 14. The electrosurgical instrument as in Claim 11, wherein:
said actuator means is moveable to cause said rod means to be moved from a first position wherein said distal end of the sheath means is in covering relation to said electrode means, to a second position wherein said distal end of said rod means is extended to expose said electrode means beyond said distal end of the sheath means.
15. The electrosurgical instrument as in Claim 14, further including detent means disposed between said rod means and said sheath means for establishing said first and second positions.
16. The electrosurgical instrument as in Claim 11, wherein said tubular sheath means is effectively pneumatically sealed relative to said rod means.
17. The electrosurgical instrument as in Claim 11, further including:
at least one pressure release port disposed along said sheath means.
18. The electrosurgical instrument as in Claim 11, further including:
a hand switch means for controlling the supply of RF voltage to said electrode means.
19. The electrosurgical instrument as in Claim 11, further including:
a foot switch means for controlling the supply of RF voltage to said electrode means.
CA002081077A 1991-12-02 1992-10-21 Electrosurgial instrument with extendable sheath for irrigation and aspiration Abandoned CA2081077A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/801,385 1991-12-02
US07/801,385 US5197963A (en) 1991-12-02 1991-12-02 Electrosurgical instrument with extendable sheath for irrigation and aspiration

Publications (1)

Publication Number Publication Date
CA2081077A1 true CA2081077A1 (en) 1993-06-03

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Family Applications (1)

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Country Status (4)

Country Link
US (1) US5197963A (en)
EP (1) EP0545540A1 (en)
JP (1) JPH05237193A (en)
CA (1) CA2081077A1 (en)

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