US3859986A - Surgical device - Google Patents

Abstract

A surgical device includes a flexible inner tube having one end dipped in a liquid refrigerant, a flexible outer tube receiving the inner tube and having a freezing tip disposed at a distance from the other end of the inner tube to define a space therebetween, and a vacuum pump for evacuating the outer tube and space, so that the refrigerant is introduced into the space through the inner tube to be evaporated therein to cool the freezing tip.

Description

[ 1 Jan. 14, 1975 United States Patent [1 1 Okada et al.

1.11111 1. 333.5%3 0000 0 3333003 ////2/ onoooooo oo 2222 2 llll l mmmfllum un t.an mflh m e mmSd a k. w mmac amoymm, hahe r CLTRYB 60000 2 667777 999999 l l l l ll 9000223 J an ap Primary Examiner-Channing L. Pace [22] Filed: June 20, 1973 [21] Appl. No.: 371,935

ABSTRACT A surgical device includes a flexible inner tube having one end dipped in a liquid refrigerant, a flexible outer tube receiving the inner tube and having a freezing tip disposed at a distance from the other end of the inner %15 3 07 3 B1 0 8b B 21800 1 6%2 9 1 M J 0%0O 8/ 1 y 6 Ibo .1 m6/ m mml m. h nnc a ""e "ms L C WM te I III- U'mF .llzl. 218 555 [ll tube to define a space therebetween, and a vacuum pump for evacuating the outer tube and space, so that the refrigerant is introduced into the space through References Cited UNITED STATES PATENTS the inner tube to be evaporated therein to cool the freezing tip.

2,583,937 Fossati........ 128/303.l5 x 2,672,032 11 Claims, 4 Drawing Flgures 3/1954 Towse....................... 128/3031 UX Fill/III!!!lvlvilillllllllith PATENTED JAN 1 41975 SHEEI10F 3 FIG.

SURGICAL DEVICE BACKGROUND OF THE INVENTION This invention relates to a surgical device for freezing and treating the diseased portion of the cavity wall such as the inner wall of the stomach.

In surgical operations for cancer of the urinary bladder, hypertrophy of the prostatic gland and the like, there is commonly used a surgical device for freezing the diseased portion to destroy the affected cellular tissue. In the device, the diseased portion is frozen by a freezing metal tip which is cooled in contact with and by evaporation of a liquid refrigerant such as liquid nitrogen. The liquid refrigerant is supplied from a refrigerant container through an innertube to be evaporated near the metal tip and then the evaporated refrigerant is discharged through an outer tube.

In the conventional device, such a liquid refrigerant is supplied into the first tube by means of pressuring the liquid in the container. Such a means tends to give rise to a complicated construction and difficulties in adjusting the temperature of the metal tip. Further other means to thermally insulate a liquid refrigerant flowing through the inner tube from the outside is unable to satisfy the following requirements. The means has been required to have an excellent insulation and permit the outer tube to be of a small outer diameter.

SUMMARY OF THE INVENTION It is an object of this invention to provide a surgical device which is simple in construction andprovides sufficiently controllable low temperature for freezing the diseased portion.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a surgical device having a surgical instrument and a cystoscope; v

FIG. 2 is a side view .of a surgical device having the surgical instrument and another cystoscope;

FIG. 3 is a perspective view of an endoscope combined with the surgical instrument; and

FIG. 4 is an enlarged sectional view showing the part of the endoscope illustrated in FIG. 3.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a surgical device having a surgical instrument l and a cystoscope 2 to perform an operation for cancer of the urinary bladder. Thesurgical instrument 1 includes an elongated flexibleouter tube 3 formed of, for example, polytetrafluoroethylene or synthetic resin and a flexible inner tube 4 of a freezingresistant material e.g., fluorine resin which is inserted in theouter tube 3. The outer diameter of the inner tube 4 is made slightly smaller than the inner diameter of theouter tube 3 so as to provide a cylindrical space between thetubes 3 and 4. The outer tube, however, is movably disposed relative to the inner tube. Preferably, theouter tube 3 has a plurality of adiabatic ribs on its inner surface which extend in the lengthwise direction and are equally spaced apart from each other so that the inner tube 4 may be .coaxially supported by theouter tube 3. This insures that refrigerant flowing through the inner tube is thermally insulated from theouter tube 3. Alternatively, it is possible to form adiabatic ribs on'the outer surface of the inner tube 4.

Afreezing metal tip 5 is sealingly mounted on one end of theouter tube 3. A nozzle 6 is formed at one end of the inner tube 4 and slightly spaced apart from the inner surface of themetal tip 5 to define a space therebetween.

A rigid inner sleeve 7 is tightly connected at one end to the other end of theouter tube 3. The inner sleeve 7 is slidably inserted in anouter sleeve 8 which is closed at one end facing the other end of the inner sleeve 7. An O-ring seal 9 is fitted on the outer wall of the inner sleeve 7 so as to enable the inner sleeve 7 to slide through theouter sleeve 8 in an air-tight manner. A threaded hole is formed in the side wall of theouter sleeve 8, preferably near the open end of theouter sleeve 8. A screw 10 is inserted in the threaded hole to fix the inner sleeve 7 to theouter sleeve 8. Since theouter tube 3 is connected to the inner sleeve 7 and the inner tube 4 is fixed to theouter sleeve 8, the distance between the nozzle 6 and themetal tip 5 is easily adjusted by sliding the inner sleeve 7 through theouter sleeve 8. The adjusted distance may be maintained by tightening the screw 10 to fix the inner sleeve 7 to theouter sleeve 8.

An exhaust pipe 11 is connected at one end to the outer sleeve .8 near the closed end and at the other end to avacuum pump 12. The exhaust pipe 11 has a vacuum gauge 12a so as to measure vacuum pressure in the exhaust pipe 11,outer sleeve 8, inner sleeve 7, and theouter tube 3.

The inner tube 4 inserted in theouter tube 3 extends through sleeves 7 and .8 into refrigerant such as a liquid nitrogenin arefrigerant container 13. To the end of the inner tube 4 dipped in the refrigerant is attached afilter 14 which permits only the refrigerant to pass through the inner tube 4. Part of the inner tube 4 extending from the closed end of theouter sleeve 8 to thecontainer 13 is covered with anadiabatic member 15 of, for example, polystyrene foam.

Thesurgical instrument 1 may be assembled with the cystoscope 2 wherein the end portion of theouter tube 3 is inserted movably through the sheath 16 of the cystoscope. Thefreezing tip 5 is extended from one end of the sheath 16. A light guide 17 made of an optical fiber bundle is inserted into the sheath 16 to illuminate the area around the diseased part and freezingtip 5. The sheath 16 is provided with a water inlet 18 andoutlet 19 to pass the water through the sheath thereby melting the ice formed on the periphery of theouter tube 3.

The operation of thesurgical instrument 1 and cystoscope 2 to treat cancer of the urinary bladder is described below.

First, the diseased portion is located with-the naked eye through the sheath while illuminating the inner wall of the urinary bladder. Then, thefreezing tip 5 is brought close to the diseased portion. In this condition, theouter sleeve 8 andouter tube 3 are evacuated by operating thevacuum pump 12 so that the refrigerant in thecontainer 13 may be conducted through the inner tube 4 to the nozzle 6 and projected from the nozzle 6 to thefreezing tip 5. The refrigerant, when projected from the nozzle 6, is evaporated and discharged through theouter tube 3. Thefreezing tip 5 is cooled in contact with the refrigerant and also by evaporation of the refrigerant. While observing both thetip 5 and the diseased portion through the cystoscope 2, thetip 5 which is cooled is brought into direct contact with exactly the diseased portion to freeze the diseased portion and treat the cancer of the urinary bladder.

Another type of the cystoscope which may be assembled with thesurgical instrument 1 will be illustrated with reference to FIG. 2.

Thecystoscope 20 includes asheath 21 with a closed top end, an opening 22for the surgical instrument andwindow 23. Atelescope 24 is slidably inserted in the sheath through a guide formed in the sheath, which is provided with an ocular 25 at one end and an observingwindow 26 at its other end. An optical system constructed with lenses and a prism is mounted in thetelescope 24 to optically connect the ocular 25 to the observingwindow 26. Thetelescope 24 is further provided with alight guide 27 made of a bundle of optical fibers, which guides a light from a light source (not shown) to thewindows 23, 26.

The flexibleouter tube 3 of thesurgical instrument 1 is inserted through the sheath 21' at an opening formed on the base side thereof. The top portion of theouter tube 3 andmetal tip 5 are extended from the opening 22 near thewindow 23. The extended portion of the outer tube 3'may be controlled to vary its inclined angle to the longitudinal axis of the telescope by operating an angle adjusting mechanism 28. The mechanism 28 may be designed to have the same construction as a conventional forceps raising mechanism of an endoscope. The mechanism 28 includes a pivoted arm mounted in the sheath and a wire one end of which is connected to the arm and the other end of which is connected to alever 29 mounted on the base of the sheath. The arm may be pivoted by the operation of thelever 29 to change the inclined angle of theouter tube 3.

The operation of the surgical device shown in FIG. 2 is substantially similar to that of FIG. 1 and thus omitted in the description.

FIGS. 3 and 4 show a well knownendoscope 30 combined with thesurgical instrument 1 described above, which includes acontrol unit 31, aflexible tube 32 to be inserted into the body cavity and adistal end 33 attached to the end of theflexible tube 32. Thedistal end 33 is provided with aviewing window 34, an illuminating window 35 for illuminating the viewing field of thewindow 34 and aforceps opening 36, which are formed on the front side of thedistal end 33. Theviewing window 34 is optically connected to an ocular 37 mounted on thecontrol unit 31 through a bundle of optical fibers arranged in theflexible tube 32. The illuminating window 35 is optically connected to a light source (not shown) through a light guide disposed in theflexible tube 32 andcontrol unit 31. Thecontrol unit 31 also includesa forceps inlet opening 39 through which a forceps (not shown) may be inserted into the forceps channel provided in theflexible tube 32 until the end of the forceps extends out through the forceps opening 36 of thedistal end 33. In the distal end near the forceps opening 36 there is arranged aforceps raising mechanism 40 which is mechanically connected to thecontrol unit 31 through a wire, so that the raisingmechanism 40 is operated by thecontrol unit 31 to change the inclined angle of the extended portion of the forceps. Theendoscope 30 is further provided with a bending mechanism (not shown) which is also operated by the control unit to adjustably vary the bending angle of the portion of theflexible tube 32 near thedistal end 33.

In operation, thesurgical instrument 1 is combined with theendoscope 30, as shown in FIG. 3. Theouter tube 3 of the surgical instrument is inserted into the forceps inlet opening 39 of the latter endoscope to extend the. top of theouter tube 3 and themetal tip 5 from the forceps opening 36 in thedistal end 33, instead of a conventional forceps. Thedistal end 33;andflexible tube 32 are inserted into the cavity of a human body, together with theouter tube 3 andmetal tip 5 of the surgical instrument. Then, the diseased portion is observed through the ocular 37 and viewing window, and the inclined angle of the extended portion of theouter tube 3 is adjusted by operating the forceps raising mechanism to allow themetal tip 5 to contact with the diseased portion. Operation of the surgical instrument is similar to that detailed in connection with FIG. 1 and thus omitted in the description.

With the described surgical devices, the diseased portion of the human body may be frozen by direct contact with the metal tip which has been cooled in the following manner. The liquid refrigerant contained in thecontainer 13 is sucked into the inner tube 4 and then sprayed or projected from the nozzle 6 into the evaporating space between the nozzle 6 and the inner surface of themetal tip 5, by driving thevacuum pump 12 to evacuate said evaporating space through the discharge tube 11 and theouter tube 3. The projected refrigerant may be evaporated in the evaporation space to effectively cool the metal tip, since the evaporating space has large dimensions relative to the opening of the nozzle. The dimensions of the evaporating space may be adjustably changed by moving the inner sleeve 7 through theouter sleeve 8 along its longitudinal axis, so that the temperature of the metal tip may be easily controlled.

- The vacuum means such aspump 12 evacuates the cylindrical space between theouter tube 3 and inner tube 4, so that the liquid refrigerant in thecontainer 13 may be introduced into the evaporating space through the inner tube 4, and also the nozzle 6 and the liquid refrigerant flowing through the inner tube may be thermally insulated from the outside.

In the surgical device according to the present invention supplemental means for pressuring the liquid re-' frigerant may be added to the vacuum means so as to introduce the refrigerant into the evaporating space.

What we claim is:

l. A surgical device for treating a diseased portion comprising an inner tube having one end dipped in a liquid refrigerant and the other end provided with a nozzle, an outer tube spaced from and surrounding at least the other end portion of the inner tube and the nozzle, said tubes being movably disposed relative to each other, the outer tube having a freezing tip at one end disposed at a distance from the nozzle to define an evaporating space therebetween, vacuum means for evacuating the space between the outer periphery of the inner tube and the inner periphery of the outer tube and the evaporating space, to introduce the liquid refrigerant from said one end of the inner tube to the evaporating space, whereby the refrigerant is evaporated in said evaporating space to cool said freezing tip, the evaporated refrigerant then passing through the space between the. inner and outer tubes to thermally insulate from the ambient the liquid refrigerant passing through the inner tube, said vacuum means being connected to an outer sleeve fixed to the inner sleeve, an

inner sleeve coaxially inserted in said outer sleeve and movable along its axis, one end of said inner sleeve being connected to the other end of said outer tube, and a member for fixing the position of the inner sleeve relative'to the outer sleeve, whereby to adjust the distance between the nozzle and freezing tip to control the dimensions of the evaporating space.

2. The surgical device according toclaim 1 wherein said inner and outer tubes are flexible tubes,

3. The surgical device according to claim 2 wherein said flexible tubes are made of thermal insulating substance.

4. The surgical device according toclaim 3 wherein the thermal insulating substance is polyfluoroethylene.

5. The surgical device according to claim 2 wherein the freezing tip is attached to the end of the outer tube and made of metal.

6. The surgical device according toclaim 1 which further comprises means for observing the freezing tip.

7. The surgical device according to claim 6 wherein said observing means is a cycstoscope comprising a sheath through which the outer tube is inserted to extend the freezing tip from an open end of the sheath, and a light guide inserted in the sheath for illuminating the area around the freezing tip.

8. The surgical device according to claim 6 wherein said observing means is a cystoscope comprising a sheath with an opening and window which are formed near one end of the sheath, a light guide inserted in the sheath to illuminate the viewing field of the window, and a telescope slidably inserted in the sheath and having an ocular and optical system optically connecting the ocular to the window, the outer tube being slidably inserted through the sheath with the freezing tip extended from the opening in the sheath.

9. The surgical device according to claim 6 wherein said observing means is an endoscope comprising a distal end with a viewing window, illuminating window, opening, and a raising mechanism, a flexible tube on one end of which the distal end is mounted, and a control unit mounted on the other end of the flexible tube having an inlet opening and an ocular optically connected to the viewing window in the distal end, the outer tube being slidably inserted into the control unit inlet opening and through the endoscope, so that said one end of the outer tube and the freezing tip are extended from the opening in the distal end, and the extended portion of the outer tube end being adjustably inclined by the raising mechanism.

10. The surgical device according toclaim 1 which further comprises a container for the liquid refrigerant in which said one end of the inner tube is dipped.

11. The surgical device according to claim 10 wherein said one end of the inner tube is provided with afilter.

Claims (11)

1. A surgical device for treating a diseased portion comprising an inner tube having one end dipped in a liquid refrigerant and the other end provided with a nozzle, an outer tube spaced from and surrounding at least the other end portion of the inner tube and the nozzle, said tubes being movably disposed relative to each other, the outer tube having a freezing tip at one end disposed at a distance from the nozzle to define an evaporating space therebetween, vacuum means for evacuating the space between the outer periphery of the inner tube and the inner periphery of the outer tube and the evaporating space, to introduce the liquid refrigerant from said one end of the inner tube to the evaporating space, whereby the refrigerant is evaporated in said evaporating space to cool said freezing tip, the evaporated refrigerant then passing through the space between the inner and outer tubes to thermally insulate from the ambient the liquid refrigerant passing through the inner tube, said vacuum means being connected to an outer sleeve fixed to the inner sleeve, an inner sleeve coaxially inserted in said outer sleeve and movable along its axis, one end of said inner sleeve being connected to the other end of said outer tube, and a member for fixing the position of the inner sleeve relative to the outer sleeve, whereby to adjust the distance between the nozzle and freezing tip to control the dimensions of the evaporating space.

2. The surgical device according to claim 1 wherein said inner and outer tubes are flexible tubes.

3. The surgical device according to claim 2 wherein said flexible tubes are made of thermal insulating substance.

4. The surgical device according to claim 3 wherein the thermal insulating substance is polyfluoroethylene.

5. The surgical device according to claim 2 wherein the freezing tip is attached to the end of the outer tube and made of metal.

6. The surgical device according to claim 1 which further comprises means for observing the freezing tip.

7. The surgical device according to claim 6 wherein said observing means is a cycstoscope comprising a sheath through which the outer tube is inserted to extend the freezing tip from an open end of the sheath, and a light guide inserted in the sheath for illuminating the area around the freezing tip.

8. The surgical device according to claim 6 wherein said observing means is a cystoscope comprising a sheath with aN opening and window which are formed near one end of the sheath, a light guide inserted in the sheath to illuminate the viewing field of the window, and a telescope slidably inserted in the sheath and having an ocular and optical system optically connecting the ocular to the window, the outer tube being slidably inserted through the sheath with the freezing tip extended from the opening in the sheath.

9. The surgical device according to claim 6 wherein said observing means is an endoscope comprising a distal end with a viewing window, illuminating window, opening, and a raising mechanism, a flexible tube on one end of which the distal end is mounted, and a control unit mounted on the other end of the flexible tube having an inlet opening and an ocular optically connected to the viewing window in the distal end, the outer tube being slidably inserted into the control unit inlet opening and through the endoscope, so that said one end of the outer tube and the freezing tip are extended from the opening in the distal end, and the extended portion of the outer tube end being adjustably inclined by the raising mechanism.

10. The surgical device according to claim 1 which further comprises a container for the liquid refrigerant in which said one end of the inner tube is dipped.

11. The surgical device according to claim 10 wherein said one end of the inner tube is provided with a filter.

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