CA2013153A1 - Apparatus of a spinning type of resectoscope for prostatectomy - Google Patents
Apparatus of a spinning type of resectoscope for prostatectomyInfo
- Publication number
- CA2013153A1 CA2013153A1 CA 2013153 CA2013153A CA2013153A1 CA 2013153 A1 CA2013153 A1 CA 2013153A1 CA 2013153 CA2013153 CA 2013153 CA 2013153 A CA2013153 A CA 2013153A CA 2013153 A1 CA2013153 A1 CA 2013153A1
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- Prior art keywords
- resectoscope
- prostatectomy
- tube
- spinning type
- electrode
- Prior art date
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- 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
- A61B18/149—Probes or electrodes therefor bow shaped or with rotatable body at cantilever end, e.g. for resectoscopes, or coagulating rollers
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- Health & Medical Sciences (AREA)
- Surgery (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biomedical Technology (AREA)
- Otolaryngology (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Plasma & Fusion (AREA)
- Physics & Mathematics (AREA)
- Heart & Thoracic Surgery (AREA)
- Medical Informatics (AREA)
- Molecular Biology (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Surgical Instruments (AREA)
Abstract
TITLE OF THE INVENTION: AN APPARATUS OF A SPINNING
TYPE OF RESECTOSCOPE FOR PROSTATECTOMY
ABSTRACT OF THE DISCLOSURE
An apparatus of a new type of resectoscope for prostatectomy essentially comprising an electrical driving system which is connected to a replaceable high resistivity electrotome, or a screw thread cutting-knife, and a tube-electrode to achieve the spinning-type of resection for prostate or bladder tumor. A DC-motor and a transmission-gear set are mounted within a hand grip. Other devices, such as the resectoscope sheath, telescope universal electro-surgical unit, optical light source, and universal light guide cable may be connected to this apparatus. The resectoscope provides a high speed operation, safety, effectiveness, and convenience.
TYPE OF RESECTOSCOPE FOR PROSTATECTOMY
ABSTRACT OF THE DISCLOSURE
An apparatus of a new type of resectoscope for prostatectomy essentially comprising an electrical driving system which is connected to a replaceable high resistivity electrotome, or a screw thread cutting-knife, and a tube-electrode to achieve the spinning-type of resection for prostate or bladder tumor. A DC-motor and a transmission-gear set are mounted within a hand grip. Other devices, such as the resectoscope sheath, telescope universal electro-surgical unit, optical light source, and universal light guide cable may be connected to this apparatus. The resectoscope provides a high speed operation, safety, effectiveness, and convenience.
Description
2~:131~3 AN APPARATUS OF A SPINNING TYPE
OF RESECTOSCOPE FOR PROSTATECTOMY
TECHNICAL FIELD
The present invention relates to an apparatus of a new type of resectoscope for prostatectomy.
The main structure of this apparatus involves an - electrical driving system which is connected to a replaceable high resistivity electrotome and a tube-electrode to achieve the spinning type of resection for the prostate or bladder tumor. This resectoscope is different from other conventional devices and the spinning resecting process can reduce the operation time and the surgical complications of the patient, and increase the operating number of patients per unit time. The spinning type of resecting process requires only gentle translation and small angle wiggling of the resectoscope so that the effectiveness and safety are better than conventional devices.
: ' .
BACKGROUND OF THE INVENTION
The conventional method of prostatectomy may be classified into the following four methods; the perineal prostatectomy, the suprapubic transvesical prostatectomy, the retropubic prostatectomy, and the transurethral resection of prostate which so-called TUR-P. Among these four methods, the last method is the only method which incorporates the endoscope.
Nowadays, about 90% of the prostatectomy that are performed use the technique of transurethral method 2~3~L~3 to resect the prostate, which is a well-known method.
The conventional device for the transurethral resection of prostate is a commercially available device which is a manual-type resectoscope in which the electrotome is made from a high resistivity metal wire, such as the tungsten wire or nickle-chrome alloy wire, with the electrotome having a semi-circular shape and perpendicular to the loop electrode. In operation, the electrotome is heated electrically by applying an electrical voltage across the wire which is used to resect the prostate. An operation performed using this device requires a mechanical scratch of the resectoscope to , 15 cut away the unwanted part of the tissue. This mechanical scratching process is controlled manually by the operator.
One of the disadvantages of this conventional device is that the operation is very slow because the mechanical scratching process is employed and the resecting process is a one-cut by one-cut process instead of a continuous cutting process. It usually takes at least half an hour for a skilled operator to finish an operation. Such a slow resection is certainly undesirable because it causes a long period of bleeding at the resecting portion and produces more complications for the patient, and also limits the operable number of patients in a given time interval. This leads to a high operation cost per resection.
Another disadvantage of this conventional device is that the scratching cutting process : :~ ., , .
... . :
.; .
involves a large angle movement of the resectoscope, controlled by the hands of the operator and is therefore not precise and may potentially cut through the prostate capsule and external sphincter.
This may lead to complications of capsule perforation and urination incontinence after the operation. The patient may need further operations or reconstructive procedures which may seriously injure the patient morally and physically.
SU~MARY OF THE INVENTION
The present invention relates to a new type of resectoscope for prostatectomy that is very different from that of the conventional devices.
The conventional loop electrode has been replaced by an electrotome and a tube-electrode which is connected to a motor-driving transmission gear set so that the electrotome is spinnable. The electrotome is an oval electrode made from a high resistivity metal wire as a cutting loop and a wire holder, which is replaceable and exchangeable. The wire holder is inserted into an one end of the tube-electrode, and the other end of the tube-electrode is inserted into a specially designed electrical supply source via a spring contact and is connected to a gear set. The tube-electrode is a cylinder made from a good conductive metal with its inner and outer surfaces coated by a good insulating layer to ensure the electrical insulation. The conventional telescope is coaxially inserted into the tube-electrode to provide for interior observation duringthe resection of prostate. The hand held part of 2~$~
this apparatus is a hand grip with control buttons thereon, and a DC motor therein and a gear set to facilitatQ spinning of the electrotome.
It is the primary object of this invention to provide a method and apparatus to obtain a spinning type of resectoscope for prostatectomy which mitigates the disadvantages and limitations of the conventional device.
"
Another object of this invention is to provide a method and apparatus to obtain a spinning type of resectoscope for prostatectomy of which is motor-driving spinning resection. The spinning type of resectoscope can be fixed at the interior side of the verumontanum to cut the apex tissue of the prostate by the yentle and slow circular motion of the resectoscope, and prevent it from cutting through the external sphincter and the prostate capsule under the incorporation of the U.S. Patent No. 4,651,280 "Electrosurgical control system using tissue conductivity". The apparatus of this invention provides a safer, faster, and more profitable transurethral resection of prostate .
A further object of this invention is to provide a method and apparatus to obtain a spinning type of resectoscope for prostatectomy which can speed-up the operation process, reduce operation time, reduce the bleeding of the patient, avoid complications that may be caused by the blood transfusion, and improve the safety and effectiveness of the operation.
-:-..... .
.: . .
-. . ~, . . . ;-: -,. . . ~ , . . : ~ :
:. , , :.,. . .: , Yet another object of this invention is to provide a method and apparatus to obtain a spinning type of resectoscope for prostatectomy wherein the metal-wire type electrotome and the cutting loop are 5 replaceable. ;
Still a further object of this invention is to provide a method and apparatus to obtain a spinning type of resectoscope for prostatectomy, wherein the hand-held part of the working element is equipped with push button switches that allow the selection of the cut mode or coagulation mode by using the fingers.
The hand-held part of the working element is also different from that of the prior art device which has a mechanical push-pull mechanism on it to control in-and-out movement of the loop electrode, which is not necessary with the spinning type apparatus of this învention.
Still another object of this invention is to provide a method and apparatus to obtain a spinning type of resectoscope for prostatectomy which is compatible with the commercially available versatile electrosurgical generator.
Sill a further object of this invention is to provide a method and apparatus to obtain a spinning type of resectoscope for prostatectomy which can be utilized with a robot for microcomputer-controlled electrotomy.
In a particularly preferred embodiment of the present invention there is provided an apparatus of a spinning type of resectoscope for prostatectomy, comprising: a motor drive gear transmission system including a gear box, a gear set and a DC motor and being connected to a power source supply; a resectoscope sheath consisting of an outer tube, a locker, a stopcock, and a body, wherein the stopcock is connected to the body and fi~ed by the locker thereto; an electrotome having an oval loop of metal-- 5a -wire as a cutting loop and a short section of cylindrical tube as a cutting loop holder used as a support to said oval loop of metal-wire, wherein said electrotome being spinnable by said motor-drive transmission gear set; a tube electrode being connected to said oval loop at one end thereof, : wherein the other end of the tube electrode is connected to said transmission gear set and an input power seat which is connected to a universal electrosurgical unit through a connector; a hand grip : enclosing said transmission system and equipped with controlling button to switch the motor on and off of said system, whereby the electrical voltage generated from said universal electrosurgical unit drives said DC motor and the transmission gear set to spin said tube electrode and said electrotome, and the high voltage is applied to heat the electrotome for resection or for coagulation.
-~ :
: .
- 6 .
BRIEF DESCRIPTION OF THE DRAWINGS
Regarding drawings which illustrate embodiments of this invention.
Fig. l is a perspective view. of an apparatus of resectoscope for prostatectomy in accordance with the present invention;
, '~ .
Fig. 2 is a cross-sectional view of the apparatus of a spinning type of resectoscope for prostatectomy in accordance with the present invention; it illustrates the tube-electrode which - also provides a mechanical support and a rotational axis for the electrotome; it also shows the spring contact which allows the close contact of the tube electrode during its rotation; and 15Figs. 3 and 4 are cross-sectional views of the electrotome in accordance with the present invention, which consists of an oval electrode and a short section of supporting tube. The oval electrode is made from a high resistivity metal wire and the electrotome is replaceable. The other type - of oval electrode is an open loop type of cutting knife which is made from an annealed and hardened medium or high carbon steel. This knife, which is screw threaded in shape, can cut the prostate without applying any voltage.
DEI'~ILED DESCRIPTION OF THE INVENTION
Reference is now made to the Figures, where like reference numerals indicate corresponding parts. Figs. l and 2 generally refer to the new .~, .
2 ~ :~ 3 ~ 3 type of resectoscope for prostatectomy in accordance with the present invention. As will become more apparent as the description proceeds, the resectoscope is a spinning type of device essentially comprising the following five parts:
i.e., the resectoscope sheath, the working element, the telescope, the electrotome and tube electrode, and the transmission system. Besides these five parts, there are accessories, and some external equipment rendering the resectoscope operable.
These accessories are commercially available, for example-the universal electro-surgical generator, the optical light source, the universal light guide cable, the electrical cord etc. This equipment is all compatible with the apparatus in accordance with ; the present invention.
The resectoscope sheath, as shown in Fig. 2 consists of an outer tube as the sheath 3, an inner tube (not shown), a locker 4, a stopcock 5, and a body 6. The inner tube is slightly longer than the outer tube and has a smooth head-end. In operation, the resectoscope sheath 3 is first inserted into the - tissue at the beginning of the operation and acts as a guide-tube, then the inner tube is pull out for the electrotome 1 and tube electrode 16 to coaxially sheathe into the prostate. The inner and outer surfaces of the front-end of outer tube 3 are coated with a layer of epoxy. A stabilizer 2 is located at the front-end of the tube electrode 16 to ensure stable rotation of the tube electrode 16. The stopcock 5 is connected to the body 6 and fixed by the locker 4. The stopcock 5 is connected to a water supply by a hose to clean-up the resected .
.-: : :: : :~ ; -, ., :
:
. . .
OF RESECTOSCOPE FOR PROSTATECTOMY
TECHNICAL FIELD
The present invention relates to an apparatus of a new type of resectoscope for prostatectomy.
The main structure of this apparatus involves an - electrical driving system which is connected to a replaceable high resistivity electrotome and a tube-electrode to achieve the spinning type of resection for the prostate or bladder tumor. This resectoscope is different from other conventional devices and the spinning resecting process can reduce the operation time and the surgical complications of the patient, and increase the operating number of patients per unit time. The spinning type of resecting process requires only gentle translation and small angle wiggling of the resectoscope so that the effectiveness and safety are better than conventional devices.
: ' .
BACKGROUND OF THE INVENTION
The conventional method of prostatectomy may be classified into the following four methods; the perineal prostatectomy, the suprapubic transvesical prostatectomy, the retropubic prostatectomy, and the transurethral resection of prostate which so-called TUR-P. Among these four methods, the last method is the only method which incorporates the endoscope.
Nowadays, about 90% of the prostatectomy that are performed use the technique of transurethral method 2~3~L~3 to resect the prostate, which is a well-known method.
The conventional device for the transurethral resection of prostate is a commercially available device which is a manual-type resectoscope in which the electrotome is made from a high resistivity metal wire, such as the tungsten wire or nickle-chrome alloy wire, with the electrotome having a semi-circular shape and perpendicular to the loop electrode. In operation, the electrotome is heated electrically by applying an electrical voltage across the wire which is used to resect the prostate. An operation performed using this device requires a mechanical scratch of the resectoscope to , 15 cut away the unwanted part of the tissue. This mechanical scratching process is controlled manually by the operator.
One of the disadvantages of this conventional device is that the operation is very slow because the mechanical scratching process is employed and the resecting process is a one-cut by one-cut process instead of a continuous cutting process. It usually takes at least half an hour for a skilled operator to finish an operation. Such a slow resection is certainly undesirable because it causes a long period of bleeding at the resecting portion and produces more complications for the patient, and also limits the operable number of patients in a given time interval. This leads to a high operation cost per resection.
Another disadvantage of this conventional device is that the scratching cutting process : :~ ., , .
... . :
.; .
involves a large angle movement of the resectoscope, controlled by the hands of the operator and is therefore not precise and may potentially cut through the prostate capsule and external sphincter.
This may lead to complications of capsule perforation and urination incontinence after the operation. The patient may need further operations or reconstructive procedures which may seriously injure the patient morally and physically.
SU~MARY OF THE INVENTION
The present invention relates to a new type of resectoscope for prostatectomy that is very different from that of the conventional devices.
The conventional loop electrode has been replaced by an electrotome and a tube-electrode which is connected to a motor-driving transmission gear set so that the electrotome is spinnable. The electrotome is an oval electrode made from a high resistivity metal wire as a cutting loop and a wire holder, which is replaceable and exchangeable. The wire holder is inserted into an one end of the tube-electrode, and the other end of the tube-electrode is inserted into a specially designed electrical supply source via a spring contact and is connected to a gear set. The tube-electrode is a cylinder made from a good conductive metal with its inner and outer surfaces coated by a good insulating layer to ensure the electrical insulation. The conventional telescope is coaxially inserted into the tube-electrode to provide for interior observation duringthe resection of prostate. The hand held part of 2~$~
this apparatus is a hand grip with control buttons thereon, and a DC motor therein and a gear set to facilitatQ spinning of the electrotome.
It is the primary object of this invention to provide a method and apparatus to obtain a spinning type of resectoscope for prostatectomy which mitigates the disadvantages and limitations of the conventional device.
"
Another object of this invention is to provide a method and apparatus to obtain a spinning type of resectoscope for prostatectomy of which is motor-driving spinning resection. The spinning type of resectoscope can be fixed at the interior side of the verumontanum to cut the apex tissue of the prostate by the yentle and slow circular motion of the resectoscope, and prevent it from cutting through the external sphincter and the prostate capsule under the incorporation of the U.S. Patent No. 4,651,280 "Electrosurgical control system using tissue conductivity". The apparatus of this invention provides a safer, faster, and more profitable transurethral resection of prostate .
A further object of this invention is to provide a method and apparatus to obtain a spinning type of resectoscope for prostatectomy which can speed-up the operation process, reduce operation time, reduce the bleeding of the patient, avoid complications that may be caused by the blood transfusion, and improve the safety and effectiveness of the operation.
-:-..... .
.: . .
-. . ~, . . . ;-: -,. . . ~ , . . : ~ :
:. , , :.,. . .: , Yet another object of this invention is to provide a method and apparatus to obtain a spinning type of resectoscope for prostatectomy wherein the metal-wire type electrotome and the cutting loop are 5 replaceable. ;
Still a further object of this invention is to provide a method and apparatus to obtain a spinning type of resectoscope for prostatectomy, wherein the hand-held part of the working element is equipped with push button switches that allow the selection of the cut mode or coagulation mode by using the fingers.
The hand-held part of the working element is also different from that of the prior art device which has a mechanical push-pull mechanism on it to control in-and-out movement of the loop electrode, which is not necessary with the spinning type apparatus of this învention.
Still another object of this invention is to provide a method and apparatus to obtain a spinning type of resectoscope for prostatectomy which is compatible with the commercially available versatile electrosurgical generator.
Sill a further object of this invention is to provide a method and apparatus to obtain a spinning type of resectoscope for prostatectomy which can be utilized with a robot for microcomputer-controlled electrotomy.
In a particularly preferred embodiment of the present invention there is provided an apparatus of a spinning type of resectoscope for prostatectomy, comprising: a motor drive gear transmission system including a gear box, a gear set and a DC motor and being connected to a power source supply; a resectoscope sheath consisting of an outer tube, a locker, a stopcock, and a body, wherein the stopcock is connected to the body and fi~ed by the locker thereto; an electrotome having an oval loop of metal-- 5a -wire as a cutting loop and a short section of cylindrical tube as a cutting loop holder used as a support to said oval loop of metal-wire, wherein said electrotome being spinnable by said motor-drive transmission gear set; a tube electrode being connected to said oval loop at one end thereof, : wherein the other end of the tube electrode is connected to said transmission gear set and an input power seat which is connected to a universal electrosurgical unit through a connector; a hand grip : enclosing said transmission system and equipped with controlling button to switch the motor on and off of said system, whereby the electrical voltage generated from said universal electrosurgical unit drives said DC motor and the transmission gear set to spin said tube electrode and said electrotome, and the high voltage is applied to heat the electrotome for resection or for coagulation.
-~ :
: .
- 6 .
BRIEF DESCRIPTION OF THE DRAWINGS
Regarding drawings which illustrate embodiments of this invention.
Fig. l is a perspective view. of an apparatus of resectoscope for prostatectomy in accordance with the present invention;
, '~ .
Fig. 2 is a cross-sectional view of the apparatus of a spinning type of resectoscope for prostatectomy in accordance with the present invention; it illustrates the tube-electrode which - also provides a mechanical support and a rotational axis for the electrotome; it also shows the spring contact which allows the close contact of the tube electrode during its rotation; and 15Figs. 3 and 4 are cross-sectional views of the electrotome in accordance with the present invention, which consists of an oval electrode and a short section of supporting tube. The oval electrode is made from a high resistivity metal wire and the electrotome is replaceable. The other type - of oval electrode is an open loop type of cutting knife which is made from an annealed and hardened medium or high carbon steel. This knife, which is screw threaded in shape, can cut the prostate without applying any voltage.
DEI'~ILED DESCRIPTION OF THE INVENTION
Reference is now made to the Figures, where like reference numerals indicate corresponding parts. Figs. l and 2 generally refer to the new .~, .
2 ~ :~ 3 ~ 3 type of resectoscope for prostatectomy in accordance with the present invention. As will become more apparent as the description proceeds, the resectoscope is a spinning type of device essentially comprising the following five parts:
i.e., the resectoscope sheath, the working element, the telescope, the electrotome and tube electrode, and the transmission system. Besides these five parts, there are accessories, and some external equipment rendering the resectoscope operable.
These accessories are commercially available, for example-the universal electro-surgical generator, the optical light source, the universal light guide cable, the electrical cord etc. This equipment is all compatible with the apparatus in accordance with ; the present invention.
The resectoscope sheath, as shown in Fig. 2 consists of an outer tube as the sheath 3, an inner tube (not shown), a locker 4, a stopcock 5, and a body 6. The inner tube is slightly longer than the outer tube and has a smooth head-end. In operation, the resectoscope sheath 3 is first inserted into the - tissue at the beginning of the operation and acts as a guide-tube, then the inner tube is pull out for the electrotome 1 and tube electrode 16 to coaxially sheathe into the prostate. The inner and outer surfaces of the front-end of outer tube 3 are coated with a layer of epoxy. A stabilizer 2 is located at the front-end of the tube electrode 16 to ensure stable rotation of the tube electrode 16. The stopcock 5 is connected to the body 6 and fixed by the locker 4. The stopcock 5 is connected to a water supply by a hose to clean-up the resected .
.-: : :: : :~ ; -, ., :
:
. . .
3~3 tissue in the prostate and facilltate observation of the interior reseeting portion through a telescope.
The sheath 3 has the loeker 4 to lock or unlock from the body 6.
The working element whieh is the major part of this invention consists of an eleetrotome 1, the tube electrode 16, a stop vàlve 7, a locking mechanism 8, an eleetrical adaptor for motor 9, a transmission system 10, an input power seat 11, a conneetor for the electrical cord 12, an adaptor for the telescope 13, and a hand grip 30.
The electrotome 1, as shown in Fig. 1 and Figs.
3 and 4, is an oval loop of metal-wire 14 that serves as a eutting loop and a short seetion of eylindrieal tube 15 that serves as a cutting loop holder and is used to support the oval loop 14. The oval ~oop 14 is made from a high resistivity metal wire, such as tungsten wire or niekle-chrome alloy wire or nickle-ehrome alloy wire. The eutting loop holder 15 is a highly conductive metallie tube. The eleetrotome 1 is inserted into the one end of the tube electrode 16. The other end of the tube electrode 16 is connected to the transmission gear ~- set 34 and an input power seat 11, whieh is connected to a universal electro-surgieal unit through the eonnector 12 and an eleetrieal eord. In operation, the high voltage is applied to heat the eleetrotome 1 for resection or for coagulation. The cutting loop ean also be a pure meehanical eutting knife 14-a, which is shown in Fig. 4. This eutting knife 14-a is an open elliptic loop which has a screw thread cutting curve. The cutting knife 14-a is made from an annealed and hardened medium steel or high carbon steel which is screw threaded in shape. The cutting knife 14-a can be used for resection with no external voltage, and can also be ; 5 used for coagulation if high voltage is applied.
The electrotome 1 in accordance with the present invention is replaceable and exchangeable.
The electrotome 1 is spinnable by the motor-derived transmission gear set 32 via the tube electrode 16.
The inner and outer surfaces of the tube electrode 16 are coated with a high insulating Teflon* layer to ensure excellent electrical insulation.
Referring to Figs. 1 and 3, a stop valve 7 is fixed onto the tube electrode 16 to stop water leakage and lock to the body 6. l'he locking mechanism 8, as shown in Figs. 1 and 2, is used to lock and fix the hand grip 30 to the resectoscope sheath 3 via body 6. The transmission system 10 is located inside the hand grip 30. Reference numeral 31 is a gear box. The hand grip 30 is equipped with a button 17 to switch the motor on and off.
Optionally, more buttons may be installed to select the electrical voltage for resection mode or coagulation mode for the electrotome 1. Within the gear box 31, a gear set 32 and a DC motor 3~ are installed. The electrical supply is connected to the DC motor through the adaptor 9. The detail structure of the transmission system 10 can be seen in Figs. 1 and 2. The spinning speed of the electrotome 1 is variable by adjusting the gear set 32. The lateral cross-sectional view and top view of the detail structure of input power seat 11 are *Trade mark .~ 3 shown in Fig. 2 in which the reference numeral 38 is referred to a spring contact which is always kept in close contact with the tube electrode 16 when it rotates to supply the electrical voltage to the electrotome 1 through the tube electrode 16.
~lectrical connector 12 is fixed to spring contact holder 37 by using a copper bolt 36, and 35 is the insulating-protection cover for the connector 12.
Reference numeral 13 in Figs. 1 and 2 is an adaptor for the telescope which is designed to match the telescope of the conventional device.
Therefore, the conventional telescope of the device can be adopted directly to the resectoscope in accordance with the present invention. The telescope is inserted into the tube electrode 16 coaxially. The tube electrode 16 has a stabilizer 2 at the front end thereof, as shown in Figs. 1 and 2, to ensure stable rotation of the electrode thereof.
The spinning of the tube electrode 16 does not effect the viewing of the telescope. In the resectoscope of the present invention, a telescope may be adequate for resection, although other viewing angles of telescopes can still be used.
In operation, the electrical voltage generated from a universal electro-surgical unit is transmitted by a cord to the connector 12. ~nother electrical source connected to the adaptor 9 is used to drive the DC motor 34 and the transmission gear set 32 to spin the tube electrode 16 and the electrotome 1. The telescope has a connector connected to an optical light source generator using a light cable. The irrigating water is led into the . , . ~ . . . :
.
;L ~ ~
prostate from a water source through the resectoscope sheath 3 and the stopcock 5.
This new type of resectoscope provides several important features such as safety, effectiveness, function ability, compatibility, and most importantly, it speeds up the operation.
The present invention has been described with respect only to an oval loop electrotome 1. This configuration or shape may or may not be valid, depending upon requirements. The electrotome 1 can be in the shape of 14-a, which is shown in Figs. 3 and 4 in which two pieces of medium-carbon steel or high-carbon steel are formed in the shape of a screw thread that can easily cut the tissue without applying any voltage through it.
Further variations and modifications may also be made without departing from what we regard as our invention. For example, the principles of our invention may be applied virtually to any embodiment described or suggested in the prior art devices, and current commercially available devices such as Olympus products, by substituting for its loop electrode and manual-type of working element our counterparts of the spinning mechanisms. A11 of the advantages described herein may then be obtained from such other embodiments. While the invention has been described and illustrated in detail, it should be clearly understood that this is intended by way of illustration and example only and should not to be taken in any way as a limitation. The spirit and scope of this invention are limited only by the terms of the following claims:
, ,
The sheath 3 has the loeker 4 to lock or unlock from the body 6.
The working element whieh is the major part of this invention consists of an eleetrotome 1, the tube electrode 16, a stop vàlve 7, a locking mechanism 8, an eleetrical adaptor for motor 9, a transmission system 10, an input power seat 11, a conneetor for the electrical cord 12, an adaptor for the telescope 13, and a hand grip 30.
The electrotome 1, as shown in Fig. 1 and Figs.
3 and 4, is an oval loop of metal-wire 14 that serves as a eutting loop and a short seetion of eylindrieal tube 15 that serves as a cutting loop holder and is used to support the oval loop 14. The oval ~oop 14 is made from a high resistivity metal wire, such as tungsten wire or niekle-chrome alloy wire or nickle-ehrome alloy wire. The eutting loop holder 15 is a highly conductive metallie tube. The eleetrotome 1 is inserted into the one end of the tube electrode 16. The other end of the tube electrode 16 is connected to the transmission gear ~- set 34 and an input power seat 11, whieh is connected to a universal electro-surgieal unit through the eonnector 12 and an eleetrieal eord. In operation, the high voltage is applied to heat the eleetrotome 1 for resection or for coagulation. The cutting loop ean also be a pure meehanical eutting knife 14-a, which is shown in Fig. 4. This eutting knife 14-a is an open elliptic loop which has a screw thread cutting curve. The cutting knife 14-a is made from an annealed and hardened medium steel or high carbon steel which is screw threaded in shape. The cutting knife 14-a can be used for resection with no external voltage, and can also be ; 5 used for coagulation if high voltage is applied.
The electrotome 1 in accordance with the present invention is replaceable and exchangeable.
The electrotome 1 is spinnable by the motor-derived transmission gear set 32 via the tube electrode 16.
The inner and outer surfaces of the tube electrode 16 are coated with a high insulating Teflon* layer to ensure excellent electrical insulation.
Referring to Figs. 1 and 3, a stop valve 7 is fixed onto the tube electrode 16 to stop water leakage and lock to the body 6. l'he locking mechanism 8, as shown in Figs. 1 and 2, is used to lock and fix the hand grip 30 to the resectoscope sheath 3 via body 6. The transmission system 10 is located inside the hand grip 30. Reference numeral 31 is a gear box. The hand grip 30 is equipped with a button 17 to switch the motor on and off.
Optionally, more buttons may be installed to select the electrical voltage for resection mode or coagulation mode for the electrotome 1. Within the gear box 31, a gear set 32 and a DC motor 3~ are installed. The electrical supply is connected to the DC motor through the adaptor 9. The detail structure of the transmission system 10 can be seen in Figs. 1 and 2. The spinning speed of the electrotome 1 is variable by adjusting the gear set 32. The lateral cross-sectional view and top view of the detail structure of input power seat 11 are *Trade mark .~ 3 shown in Fig. 2 in which the reference numeral 38 is referred to a spring contact which is always kept in close contact with the tube electrode 16 when it rotates to supply the electrical voltage to the electrotome 1 through the tube electrode 16.
~lectrical connector 12 is fixed to spring contact holder 37 by using a copper bolt 36, and 35 is the insulating-protection cover for the connector 12.
Reference numeral 13 in Figs. 1 and 2 is an adaptor for the telescope which is designed to match the telescope of the conventional device.
Therefore, the conventional telescope of the device can be adopted directly to the resectoscope in accordance with the present invention. The telescope is inserted into the tube electrode 16 coaxially. The tube electrode 16 has a stabilizer 2 at the front end thereof, as shown in Figs. 1 and 2, to ensure stable rotation of the electrode thereof.
The spinning of the tube electrode 16 does not effect the viewing of the telescope. In the resectoscope of the present invention, a telescope may be adequate for resection, although other viewing angles of telescopes can still be used.
In operation, the electrical voltage generated from a universal electro-surgical unit is transmitted by a cord to the connector 12. ~nother electrical source connected to the adaptor 9 is used to drive the DC motor 34 and the transmission gear set 32 to spin the tube electrode 16 and the electrotome 1. The telescope has a connector connected to an optical light source generator using a light cable. The irrigating water is led into the . , . ~ . . . :
.
;L ~ ~
prostate from a water source through the resectoscope sheath 3 and the stopcock 5.
This new type of resectoscope provides several important features such as safety, effectiveness, function ability, compatibility, and most importantly, it speeds up the operation.
The present invention has been described with respect only to an oval loop electrotome 1. This configuration or shape may or may not be valid, depending upon requirements. The electrotome 1 can be in the shape of 14-a, which is shown in Figs. 3 and 4 in which two pieces of medium-carbon steel or high-carbon steel are formed in the shape of a screw thread that can easily cut the tissue without applying any voltage through it.
Further variations and modifications may also be made without departing from what we regard as our invention. For example, the principles of our invention may be applied virtually to any embodiment described or suggested in the prior art devices, and current commercially available devices such as Olympus products, by substituting for its loop electrode and manual-type of working element our counterparts of the spinning mechanisms. A11 of the advantages described herein may then be obtained from such other embodiments. While the invention has been described and illustrated in detail, it should be clearly understood that this is intended by way of illustration and example only and should not to be taken in any way as a limitation. The spirit and scope of this invention are limited only by the terms of the following claims:
, ,
Claims (21)
1. An apparatus of a spinning type of resectoscope for prostatectomy, comprising:
a motor drive gear transmission system including a gear box, a gear set and a DC motor and being connected to a power source supply;
a resectoscope sheath consisting of an outer tube, a locker, a stopcock, and a body, wherein the stopcock is connected to the body and fixed by the locker thereto;
an electrotome having an oval loop of metal-wire as a cutting loop and a short section of cylindrical tube as a cutting loop holder used as a support to said oval loop of metal-wire, wherein said electrotome being spinnable by said motor-drive transmission gear set;
a tube electrode being connected to said oval loop at one end thereof, wherein the other end of the tube electrode is connected to said transmission gear set and an input power seat which is connected to a universal electrosurgical unit through a connector;
a hand grip enclosing said transmission system and equipped with controlling button to switch the motor on and off of said system, whereby the electrical voltage generated from said universal electrosurgical unit drives said DC motor and the transmission gear set to spin said tube electrode and said electrotome, and the high voltage is applied to heat the electrotome for resection or for coagulation.
a motor drive gear transmission system including a gear box, a gear set and a DC motor and being connected to a power source supply;
a resectoscope sheath consisting of an outer tube, a locker, a stopcock, and a body, wherein the stopcock is connected to the body and fixed by the locker thereto;
an electrotome having an oval loop of metal-wire as a cutting loop and a short section of cylindrical tube as a cutting loop holder used as a support to said oval loop of metal-wire, wherein said electrotome being spinnable by said motor-drive transmission gear set;
a tube electrode being connected to said oval loop at one end thereof, wherein the other end of the tube electrode is connected to said transmission gear set and an input power seat which is connected to a universal electrosurgical unit through a connector;
a hand grip enclosing said transmission system and equipped with controlling button to switch the motor on and off of said system, whereby the electrical voltage generated from said universal electrosurgical unit drives said DC motor and the transmission gear set to spin said tube electrode and said electrotome, and the high voltage is applied to heat the electrotome for resection or for coagulation.
2. An apparatus of a spinning type of resectoscope for prostatectomy as defined in claim 1, wherein the inner and outer surfaces of the front-end of said outer tube are coated with a layer of epoxy.
3. An apparatus of a spinning type of resectoscope for prostatectomy as defined in claim 2, wherein said outer tube is a metallic tube.
4. An apparatus of a spinning type of resectoscope for prostatectomy as defined in claim 1, wherein said stopcock is used to connect to a water supply through a hose to clean-up the resected tissue in the prostate and facilitate observation of the interior resecting portion through a telescope coaxially inserted into said tube electrode.
5. An apparatus of a spinning type of resectoscope for prostatectomy as defined in claim 1, wherein said locker is used to lock or unlock the sheath to the body.
6. An apparatus of a spinning type of resectoscope for prostatectomy as defined in claim 1, wherein said cutting loop is an oval loop of metal-wire being made from a high resistivity metal wire.
7. An apparatus of a spinning type of resectoscope for prostatectomy as defined in claim 6, wherein said metal-wire is tungsten wire or nickle-chrome alloy wire.
8. An apparatus of a spinning type of resectoscope for prostatectomy as defined in claim 7, wherein said cutting loop is soldered to a loop holder.
9. An apparatus of a spinning type of resectoscope for prostatectomy as defined in claim 8, wherein said cutting loop is a pure mechanical cutting knife.
10. An apparatus of a spinning type of resectoscope for prostatectomy as defined in claim 9, wherein said cutting knife is an open ellipse loop which has screw thread cutting curve.
11. An apparatus of a spinning type of resectoscope for prostatectomy as defined in claim 7, wherein said cutting knife is made from an annealed and hardened medium carbon steel or high carbon steel.
12. An apparatus of a spinning type of resectoscope for prostatectomy as defined in claim 1, wherein said tube-electrode is a metallic cylinder for conducting electrical current or voltage from an electrosurgical generator to the electrotome.
13. An apparatus of a spinning type of resectoscope for prostatectomy as defined in claim 1, wherein said tube-electrode is coated at the inner surface thereof by a layer of polytetrafluoroethylene resin, and is wrapped with a plastic shrinkage tube on its outer surface for electrical insulation.
14. An apparatus of a spinning type of resectoscope for prostatectomy as defined in claim 1, wherein said tube-electrode has a stabilizer located at the front-end thereof to ensure a stable rotation of said tube.
15. An apparatus of a spinning type of resectoscope for prostatectomy as defined in claim 1, wherein said tube-electrode has one end connected to a transmission system and an electrosurgical generator via a spring contact.
16. An apparatus of a spinning type of resectoscope for prostatectomy as defined in claim 1, wherein said tube-electrode is coaxial with the outer tube.
17. An apparatus of a spinning type of resectoscope for prostatectomy as defined in claim 1, wherein said stop valve is fixed onto said tube-electrode to stop water leakage.
18. An apparatus of a spinning type of resectoscope for prostatectomy as defined in claim 1, further comprising a locking mechanism to lock and fix the hand grip to the resectoscope sheath via the body.
19. An apparatus of a spinning type of resectoscope for prostatectomy as defined in claim 1, wherein said transmission system comprising a gear set and a DC motor is located within the hand grip.
20. An apparatus of a spinning type of resectoscope for prostatectomy as defined in claim 19, wherein said gear set is adjustable to vary the spinning speed of the electrotome.
21. An apparatus of a spinning type of resectoscope for prostatectomy as defined in claim 19, wherein said DC motor is connected to an electrical power source supply via a connector and is switched on and off by a button mounted onto the hand grip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2013153 CA2013153A1 (en) | 1990-03-27 | 1990-03-27 | Apparatus of a spinning type of resectoscope for prostatectomy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2013153 CA2013153A1 (en) | 1990-03-27 | 1990-03-27 | Apparatus of a spinning type of resectoscope for prostatectomy |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2013153A1 true CA2013153A1 (en) | 1991-09-27 |
Family
ID=4144610
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2013153 Abandoned CA2013153A1 (en) | 1990-03-27 | 1990-03-27 | Apparatus of a spinning type of resectoscope for prostatectomy |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2013153A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107126253A (en) * | 2017-05-05 | 2017-09-05 | 中国人民解放军第二军医大学 | A kind of tumor of bladder cutting device |
-
1990
- 1990-03-27 CA CA 2013153 patent/CA2013153A1/en not_active Abandoned
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107126253A (en) * | 2017-05-05 | 2017-09-05 | 中国人民解放军第二军医大学 | A kind of tumor of bladder cutting device |
| CN107126253B (en) * | 2017-05-05 | 2023-07-21 | 中国人民解放军第二军医大学 | Bladder tumor cutter |
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