US3575176A - Rechargeable cryosurgical instrument - Google Patents
Rechargeable cryosurgical instrument Download PDFInfo
- Publication number
- US3575176A US3575176A US769065A US3575176DA US3575176A US 3575176 A US3575176 A US 3575176A US 769065 A US769065 A US 769065A US 3575176D A US3575176D A US 3575176DA US 3575176 A US3575176 A US 3575176A
- Authority
- US
- United States
- Prior art keywords
- refrigerant
- end cap
- rechargeable
- cartridge
- cryosurgical instrument
- 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.)
- Expired - Lifetime
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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
- A61B18/02—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by cooling, e.g. cryogenic techniques
Definitions
- This disclosure relates to a rechargeable cryosurgical instrument having operating mechanism located at one end and a refrigerant cartridge-receiving chamber opening to the atmosphere at its other end.
- a removable end cap closes the open end of the instrument and is selectively positionable to locate a housed refrigerant cartridge in a dispensing or conserving position.
- the pressurized refrigerant is dispensed from the cartridge through a delivery tube to a boiler valve located adjacent a cooling tip to reduce the temperature of the tip.
- the spent refrigerant is exhausted from the housing through an opening in the removable end cap.
- a selectively operable finger-actuable lever located at the exterior of the housing operates the boiler valve to either cool or warm the cooling tip.
- This invention relates to a rechargeable cryosurgical instrument and, more particularly, to such a device designed for delicate surgery, which is normally cold when in use and may be rapidly warmed as desired, and in which means are provided to conserve the refrigerant when the instrument is not in use.
- cryoextraction is also utilized in removing nonmagnetic intraocular foreigt bodies, such as wood splinters.
- a cryosurgical instrument In such a surgical operation it is possible to introduce the probe of a cryosurgical instrument into the pupil and place it beside the foreign matter. As the tip of the probe is made cold, it freezes the adjacent vitreous and an expanding ice ball engulfs the foreign matter.
- withdrawing the probe towards the surface but thawing and refreezing it at frequent intervals it is possible to extract the ice-encased foreign matter from the vitreous without removing the central portion of the vitreous body in the process.
- the final removal of the foreign matter involves the loss of some of the surrounding vitreous, but this can be minimized by controlling the exit wound with sutures and by partially thawing the probe in the final stages of extraction.
- cryosurgical instruments have been developed to utilize the technique of cryosurgery. These fall into three general categories, namely: (1) continuously operating units; (2) disposable instruments which may be used but a single time; and (3) solid probes which are cooled merely by being immersed in a cold liquid such as alcohol and dry ice.
- the first category is represented by various high-priced systems such as those operating on the Peltier effect, which must be connected to a source of electrical power, or those having a remote supply tank of a suitable refrigerant which must be piped to the instrument. The latter may also require a suction pump to exhaust the refrigerant to vary the degree of cooling of the tip.
- cryosurgical instrument in the form of a rechargeable unit having a chamber therein to receive a cartridge of pressurized refrigerant.
- Another object is to provide a cryosurgical instrument of the type described in the above paragraph, wherein the instrument includes valving to render the tip of the probe normally cold and means are provided to selectively warm the tip.
- Still another object of this invention is to provide a rechargeable cryosurgical instrument which is lightweight, compact and inexpensive and which includes means to position the cartridge within the instrument body to prevent discharge of the refrigerant therefrom when the instrument is not in use.
- a rechargeable cryosurgical instrument having a body defining a refrigerant cartridge-receiving chamber opening to the atmosphere at one end and a cooling tip at the other end.
- the body houses a boiler valve adjacent the cooling tip and valveoperating means between the chamber and the cooling tip.
- Control means for the valve-operating means extends from the interior of the body to the exterior thereof and is selectively operable to move the boiler valve for cooling or warming the cooling tip.
- Means are provided for delivering the refrigerant from a refrigerant cartridge in the body chamber to the cooling tip and means are provided to exhaust the spent refrigerant from the cooling tip to the chamber.
- a removable end cap located in the open end of the body defines a vent therein and includes means for being selectively located in a refrigerant-conserving or in a refrigerant-dispensing position.
- FIG. 1 is a perspective view of the rechargeable cryosurgical instrument constructed in accordance with this invention
- FIG. 2 is a side elevational view of the rechargeable cryosurgical instrument with its end cap removed and partially broken away to show the end cap-positioning slot;
- HO. 3 is a side elevational view of a typical valved refrigerant cartridge
- HO. 4 is a partial top plan view of the end of the rechargeable cryosurgical instrument showing the end cap relative to the positioning slot;
- FIG. 5 is a longitudinal sectional view of the rechargeable cryosurgical instrument shown with the end cap in the refrigerant-conserving position;
- FIG. 6 is a longitudinal sectional view similar to that of FIG. 5 showing the rechargeable cryosurgical instrument with the end cap in the refrigerant-discharging position for normal cooling;
- FlG. 7 is a partial longitudinal sectional view similar to that of FIG. 6 showing the instrument in its thawing condition.
- FIG. 8 is an enlarged partial longitudinal sectional view showing the cooling tip in detail.
- FIG. I a rechargeable cryosurgical instrument generally referred to by the numeral 10. It is in the fonn of a pencillike instrument having a body 12 with a probe 14 at one end, terminating in a tip 16, an operating lever 18 overlying the forward portion of the body, and a removable end cap 20 selectively movable into several positions in positioning slot 22 at its other end.
- the instrument is lightweight, the body 12 being made, for example, of a suitable metal or plastic material.
- the material of which the body is made must be chosen so as to be dimensionally stable and otherwise unaffected by the use of a sterilizing gas such as ethylene oxide. Similarly, the material may be autoclavable.
- the removable end cap 20 also made of metal or plastic, comprises a cylindrical body 24 with an enlarged cylindrical knurled head 26 at one end, a smaller diameter central axial boss 28 at the other end, and an axial vent 30 passing through the body 24 and head 26.
- a radially extending positioning pin 32 located near the forward end of the body 24 cooperates with the positioning slot 22 defined in the thin wall of the instrument body.
- the positioning slot is of generally steplike configuration, including an axial entrance leg 34, a first positioning leg 36 terminating at its right end (as viewed in FIG. 4) in a first positioning seat 38, and a second positioning leg 39 having a positioning seat 40.
- Step portion 42 connects the entrance leg 34 with the first positioning leg
- step portion 44 connects the first positioning leg with the second positioning leg 39.
- the instrument body 12 is in the form of a generally cylindrical thin-walled shell defining a large chamber 46 to receive a refrigerant cartridge 48.
- the internal mechanism of the rechargeable cryosurgical instrument will now be described with reference to FIGS. 5, 6 and 7.
- a reciprocable shuttle 50 including an axial bore 52 having a chamfered entrance 54 at one end and an axial concentric passage 56 extending to its other end.
- Several finlike support ribs 57 are located at the lower end of the shuttle to assist in positioning it in the body 12 in the absence of the cartridge 48.
- a sealing O- ring 58 and a positioning ring 60 are disposed within the bore 52 and a small diameter delivery tube 62 is located within the passage 56, being secured in place within the bore of the positioning ring 60 with the left end of the delivery tube extending out of the body of the instrument.
- the shuttle 50 further includes a seat 64 defined therein to receive the end 66 of the operating lever 18 which passes through an opening 68 in the body formed through the wall thereof. The opening is sealed by a resilient sealing ring 70 encircling the lever which is held in place by means of a snap-type retaining ring 72.
- An exhaust valve 74 located at the left end of the shuttle 50 includes a sealing O-ring 76 seated in a circumferential groove 78 in the shuttle which cooperates with a radially inwardly turned lip 80 formed at the end of a thin-walled metallic cylindrical shell 82.
- the shell 82 is secured in a suitable manner to a collar 84 such as by being crimped thereon as at 86.
- An O-ring 88 seated between the shell and the collar effectively prevents gas leakage between these two members.
- the collar 84 is securely mounted upon an exhaust tube 90 at one end thereof and supports the exhaust tube so that it coaxially surrounds the delivery tube 62 forming the probe 14 extending outwardly from the body 12 through an axial opening 92 therein which opening is sealed by means of O-ring 94.
- the cooling tip 16 is in the fonn of a metal plug 96 which seals the open end of the exhaust tube 90 to prevent gas flow therefrom. It is made of a suitable metallic material selected to provide a path of high thermal conductivity therethrough. The exterior portion of the tip is shown as being rounded; however, it may comprise any configuration designed to perform a particular surgical function.
- a boiling chamber 98 formed at the interior of the probe 14 adjacent the cooling tip 16 includes a boiler valve which when closed will allow the gas to expand through a metering orifice 100.
- the form of the boiler valve illustrated in FIG. 8 is but one example of the several constructions comprehended by this invention.
- the entire assembly of: the shuttle 50 carrying the positioning ring 60, the delivery tube 62 and the O-ring 76, and the collar 84 carrying the exhaust tube 90 and the shell 82 is held in the body 12 against the sealing O-ring 94 by means of a springlike washer-type retaining ring 1 10.
- This assembly is the reusable portion of instrument 10 which receives the refrigerant cartridge 48.
- the cartridge 48 made of metal for good strength and lightweight, contains approximately l0l2 cc. of a suitable pressurized refrigerant which may be a liquid, such as Freon 12(a mark of Dupont for dichlorodifluoromethane),or a gas, such as CO
- a suitable pressurized refrigerant which may be a liquid, such as Freon 12(a mark of Dupont for dichlorodifluoromethane),or a gas, such as CO
- an aerosoltype valve 112 is disposed at one end of the cartridge 48 and is secured by means of a metal cap 114 which may be turned into a circumferential recess 116 in the cylindrical wall of the cartridge.
- the aerosol-type valve 112 clearly illustrated in FIGS.
- valve stem 118 whose right end is in the form of a solid rod portion 120 and whose left end is in the form ofa tubular portion 122 open at one end defining a radial port 124 therethrough.
- a flange 126 girdles the rod adjacent the midpoint thereof.
- Resilient sealing ring 128 is positioned adjacent the planar end wall of the cap 114 tightly encircling the left end of the valve stem 118 which passes through an opening in the cap end wall.
- a valve body includes a radially outwardly extending circumferential flange 132 captured between the cap 114 and the mouth of the tank.
- the port 124 is positioned normally at the exterior of the cartridge 48 to prevent discharge of the refrigerant.
- the rechargeable cryosurgical instrument 10 is presented to the surgeon in the operating room in a sterile condition.
- the refrigerant cartridge 48 preferably containing a sterile pressurized refrigerant, is also delivered to the surgeon in the operating room in a sterile condition and be packaged in a sterile pouch.
- the refrigerant cartridge 48 is inserted into the body chamber 46 and the tubular portion 122 of the valve stem 118 is directed into the chamfered entrance 54 and the axial bore 52 of the reciprocable shuttle 50 and is seated against the O-ring 58.
- the end cap 20 is inserted into the open end of the body, the positioning pin 32 entering the entrance leg 34 of the positioning slot 22 so that the end cap boss 28 abuts the end of the refrigerant cartridge 48 and drives it leftwardly into the body I2.
- the tubular portion 122 of the valve stem 118 is urged into contact with the sealing O-ring 58, then the shuttle 50 is moved leftwardly. urging the delivery tube 62 against the conical valve seat 102.
- Further insertion of the end cap 20 carries the tank of the refrigerant cartridge 48 over the valve stem 118 compressing the compression spring 138.
- the end cap 20 When insertion of the end cap 20 is stopped as the positioning pin 32 abuts the step portion 42, it should be rotated in a clockwise direction until the positioning pin abuts the first positioning leg 36. Releasing the end cap allows the compression spring 138 to snap it rearwardly to lodge the positioning pin in the first positioning seat 38. It should be noted with reference to FIG. 5 that in this first position the port 124 of the aerowl-typc valve underlies the resilient sealing ring 112% so that the pressurized refrigerant is unable to escape the cartridge. ln this first or ready" position of the rechargeable cryosurgical instrument it), the refrigerant may be conserved and the instrument is ready for use.
- the surgeon may initiate the nonnal cooling of the tip 16 by pushing the end cap 20 further into the body, moving the cartridge against the bias of the compression spring 138, to move the positioning pin 32 in the first positioning leg until it abuts the step portion 44 and then rotating the end cap in a clockwise direction until the positioning pin 32 abuts the second positioning leg. Releasing the end cap allows the compression spring 1133 to snap it rearwardly to lodge the positioning pin 32 in the second positioning seat. In this position, as shown in FIG. 6, the refrigerant cartridge has been moved leftvvardly over the valve stem so that the port l24l communicates the interior of the cartridge with the exterior thereof in the manner of actuating a usual aerosol-type valve.
- the pressurized refrigerant may escape the tank through the port 1124, passing between the solid rod portion 1120 of the valve stem lllb and the bore i341 of the valve body 1130 past the compression spring and the flange 12b. Since the instrument body is open to the atmosphere through the gas port 30 in the end cap 20, the pressurized refrigerant seeks an escape path thereto and flows from the cartridge d3 through the port 1241 and the tubular portion 122 of the valve stem llllb, down the delivery tube 62 to the boiling chamber 9% where it passes through the metering orifice 100 in the open end of the delivery tube.
- the sharp drop in pressure occurring across the metering orifice 100 permits the refrigerant to expand rapidly, absorbing heat from the area of the cooling tip to to cool it rapidly to a temperature low enough to cause cryoadhesion of the tip to warm moist tissue.
- the expanded and warmed spent gas is conducted through the annular passage ms to the chamber 108 where it flows out the open exhaust valve 74 through the annular passage defined between the refrigerant cartridge 48 and the inside wall of the body 12, and out the gas port 30 to the atmosphere. This is the only path available to the escaping gas since the axial opening 92 in the body is sealed by the O-ring M, and the opening 68 in the body through which the lever end 66 enters is sealed by the resilient sealing ring 7d.
- cryosurgical instrument of this invention may be temporarily deactivated to conserve the refrigerant charge. This may be accomplished by moving the end cap 20 to the first position, as clearly illustrated in FIG. 5. When the refrigerant has been exhausted, the end cap 20 can be removed to dispose of the spent cartridge and a second cartridge may be inserted if necessary.
- a rechargeable cryosurgical instrument comprising a body defining a refrigerant cartridge-receiving chamber, opening to the atmosphere, at one end and a cooling tip at the other end; boiler valve means in said body adjacent said cooling tip; a reciprocable member in said body located between said chamber and said cooling tip, carrying a delivery tube at one end and having an opening in its opposite end to receive the dispensing tube of a refrigerant cartridge; control means connected to said reciprocable member and extending to the exterior of said body, being selectively operable to move said boiler valve means for cooling or warming said cooling tip; means for exhausting spent refrigerant from said cooling tip to said chamber; a removable end cap seated in the open end of said body; and positioning means on said end cap and said body cooperating to selectively locate said end cap in a first position for retaining a refrigerant cartridge in said chamber in a nondispensing condition and a second position forcing the dispensing tube of said cartridge against said reciprocable member to release refrigerant into said delivery tube.
- said positioning means includes a positioning slot defined in the wall of said body adjacent said open end, and a radial positioning pin located on said end cap.
- said positioning means includes a positioning slot defined in the wall of said body adjacent said open end and a radial positioning pin located on said end cap, said positioning slot having a first pin-receiving seat to position said end cap relative to said body to urge a housed refrigerant cartridge into a refrigerant-conserving position and a second pin-receiving seat to position said end cap to urge a refrigerant cartridge into a refrigerant-dispensing position, and said end cap defines a vent therethrough.
- control means comprises a pivotable lever; said reciprocable member includes a seat formed therein to receive one end of said lever; and said body defines an opening therein through which said lever passes. positioned to be in substantial alignment with said seat, the rim of said opening forming a fulcrum about which said lever pivots.
Abstract
Description
Claims (9)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US76906568A | 1968-10-21 | 1968-10-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3575176A true US3575176A (en) | 1971-04-20 |
Family
ID=25084340
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US769065A Expired - Lifetime US3575176A (en) | 1968-10-21 | 1968-10-21 | Rechargeable cryosurgical instrument |
Country Status (4)
Country | Link |
---|---|
US (1) | US3575176A (en) |
ES (1) | ES176800Y (en) |
FR (1) | FR2020874A1 (en) |
GB (1) | GB1250540A (en) |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3696813A (en) * | 1971-10-06 | 1972-10-10 | Cryomedics | Cryosurgical instrument |
US3807403A (en) * | 1972-06-14 | 1974-04-30 | Frigitronics Of Conn Inc | Cryosurgical apparatus |
US3826264A (en) * | 1973-01-30 | 1974-07-30 | R Gunther | Thorn and splinter pullers |
US3830239A (en) * | 1972-09-12 | 1974-08-20 | Frigitronics Of Conn Inc | Cryosurgical device |
US3951152A (en) * | 1974-06-03 | 1976-04-20 | Dynatech Corporation | Cryosurgical probe |
US4146030A (en) * | 1976-12-27 | 1979-03-27 | Dynatech Corporation | Cryosurgical instrument |
US4602628A (en) * | 1985-01-17 | 1986-07-29 | Allen Jr Robert E | Cryogenic extractor and filler |
US5176686A (en) * | 1987-03-26 | 1993-01-05 | Poley Brooks J | Apparatus for packaging, folding, rigidifying and inserting an intraocular lens |
US6196839B1 (en) | 1999-01-29 | 2001-03-06 | Robert Gregg Ross | Continuous use orthodontic cooling appliance |
US6530946B1 (en) | 1998-04-21 | 2003-03-11 | Alsius Corporation | Indwelling heat exchange heat pipe catheter and method of using same |
WO2004089234A1 (en) * | 2003-04-08 | 2004-10-21 | 3Rd Angle (U.K.) Ltd. | Portable cryotherapeutic apparatus |
US8346373B2 (en) | 2010-08-03 | 2013-01-01 | Medtronic, Inc. | Method and apparatus for delivering a lead to a heart |
US20150148791A1 (en) * | 2011-11-05 | 2015-05-28 | Medtronic Ardian Luxemborug S.a.r.l. | Systems, devices and methods for cryogenic renal neuromodulation |
WO2019226049A3 (en) * | 2018-05-22 | 2020-01-09 | Crea Ip B.V. | Tool for cryosurgery |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CS217449B1 (en) * | 1980-07-15 | 1983-01-28 | Alexandr Belling | Exchangeable directly cooled terminal for cryosurgical tools |
GB2409815A (en) * | 2004-01-12 | 2005-07-13 | Martin Lister | Cryosurgical instrument |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3259131A (en) * | 1964-04-13 | 1966-07-05 | Schrader S Son A | Cryogenic probes for surgical use |
US3312336A (en) * | 1964-01-13 | 1967-04-04 | Whitman Publishing Company | Coin tube |
US3451395A (en) * | 1967-02-03 | 1969-06-24 | Frigitronics Of Conn Inc | Cryosurgical instruments |
-
1968
- 1968-10-21 US US769065A patent/US3575176A/en not_active Expired - Lifetime
-
1969
- 1969-07-28 GB GB1250540D patent/GB1250540A/en not_active Expired
- 1969-08-11 FR FR6927500A patent/FR2020874A1/fr not_active Withdrawn
- 1969-10-20 ES ES1969176800U patent/ES176800Y/en not_active Expired
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3312336A (en) * | 1964-01-13 | 1967-04-04 | Whitman Publishing Company | Coin tube |
US3259131A (en) * | 1964-04-13 | 1966-07-05 | Schrader S Son A | Cryogenic probes for surgical use |
US3451395A (en) * | 1967-02-03 | 1969-06-24 | Frigitronics Of Conn Inc | Cryosurgical instruments |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3696813A (en) * | 1971-10-06 | 1972-10-10 | Cryomedics | Cryosurgical instrument |
US3807403A (en) * | 1972-06-14 | 1974-04-30 | Frigitronics Of Conn Inc | Cryosurgical apparatus |
US3830239A (en) * | 1972-09-12 | 1974-08-20 | Frigitronics Of Conn Inc | Cryosurgical device |
US3826264A (en) * | 1973-01-30 | 1974-07-30 | R Gunther | Thorn and splinter pullers |
US3951152A (en) * | 1974-06-03 | 1976-04-20 | Dynatech Corporation | Cryosurgical probe |
US4146030A (en) * | 1976-12-27 | 1979-03-27 | Dynatech Corporation | Cryosurgical instrument |
US4602628A (en) * | 1985-01-17 | 1986-07-29 | Allen Jr Robert E | Cryogenic extractor and filler |
US5176686A (en) * | 1987-03-26 | 1993-01-05 | Poley Brooks J | Apparatus for packaging, folding, rigidifying and inserting an intraocular lens |
US6530946B1 (en) | 1998-04-21 | 2003-03-11 | Alsius Corporation | Indwelling heat exchange heat pipe catheter and method of using same |
US6196839B1 (en) | 1999-01-29 | 2001-03-06 | Robert Gregg Ross | Continuous use orthodontic cooling appliance |
WO2004089234A1 (en) * | 2003-04-08 | 2004-10-21 | 3Rd Angle (U.K.) Ltd. | Portable cryotherapeutic apparatus |
US8346373B2 (en) | 2010-08-03 | 2013-01-01 | Medtronic, Inc. | Method and apparatus for delivering a lead to a heart |
US20150148791A1 (en) * | 2011-11-05 | 2015-05-28 | Medtronic Ardian Luxemborug S.a.r.l. | Systems, devices and methods for cryogenic renal neuromodulation |
WO2019226049A3 (en) * | 2018-05-22 | 2020-01-09 | Crea Ip B.V. | Tool for cryosurgery |
US20210196338A1 (en) * | 2018-05-22 | 2021-07-01 | Crea Ip B.V. | Tool for cryosurgery |
Also Published As
Publication number | Publication date |
---|---|
ES176800Y (en) | 1973-03-01 |
GB1250540A (en) | 1971-10-20 |
FR2020874A1 (en) | 1970-07-17 |
ES176800U (en) | 1972-08-16 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: FRIGITRONICS OF CONN., INC. Free format text: MERGER;ASSIGNORS:FRG TWENTY-NINE CORPORATION (MERGED INTO);FRG TWENTY-EIGHT CORPORATION (CHANGED TO);REEL/FRAME:004858/0786 Effective date: 19870126 Owner name: FRIGITRONICS, INC., A CORP. OF DE Free format text: MERGER;ASSIGNORS:FRIGITRONICS, INC., A CORP. OF CT.;FRIGITRONICS OF CONN., INC., A CORP. OF CT;REEL/FRAME:004858/0780;SIGNING DATES FROM 19680314 TO 19861208 |
|
AS | Assignment |
Owner name: BANK OF NEW YORK COMMERCIAL CORPORATION, THE, 530 Free format text: SECURITY INTEREST;ASSIGNOR:FRIGITRONICS OF CONNECTICUT, INC.,;REEL/FRAME:004935/0800 Effective date: 19870724 Owner name: FRIGITRONICS INC., A DE CORPORATION Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:FRIGITRONICS OF CONN., INC.;REEL/FRAME:004935/0794 Effective date: 19870724 |
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AS | Assignment |
Owner name: FRIGI ACQUISITION, INC., A CORP. OF DE, CALIFORNIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:FRIGITRONICS OF CONN., INC.;REEL/FRAME:005262/0818 Effective date: 19900316 Owner name: FRIGI ACQUISITION, INC., 3145 PORTER DRIVE, PALO A Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:FRIGITRONICS OF CONN., INC.;REEL/FRAME:005262/0818 Effective date: 19900316 |
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AS | Assignment |
Owner name: FRIGITRONICS OF CONN., INC. Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:BANK OF NEW YORK COMMERCIAL CORPORATION, THE;REEL/FRAME:005395/0050 Effective date: 19900612 |