CA2085403A1 - Bipolar biopsy device utilizing a rotatable, single-hinged moving element - Google Patents
Bipolar biopsy device utilizing a rotatable, single-hinged moving elementInfo
- Publication number
- CA2085403A1 CA2085403A1 CA002085403A CA2085403A CA2085403A1 CA 2085403 A1 CA2085403 A1 CA 2085403A1 CA 002085403 A CA002085403 A CA 002085403A CA 2085403 A CA2085403 A CA 2085403A CA 2085403 A1 CA2085403 A1 CA 2085403A1
- Authority
- CA
- Canada
- Prior art keywords
- biopsy device
- bipolar
- bipolar biopsy
- tubular member
- core wire
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
- A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
- A61B18/14—Probes or electrodes therefor
- A61B18/1442—Probes having pivoting end effectors, e.g. forceps
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B10/00—Other methods or instruments for diagnosis, e.g. instruments for taking a cell sample, for biopsy, for vaccination diagnosis; Sex determination; Ovulation-period determination; Throat striking implements
- A61B10/02—Instruments for taking cell samples or for biopsy
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B10/00—Other methods or instruments for diagnosis, e.g. instruments for taking a cell sample, for biopsy, for vaccination diagnosis; Sex determination; Ovulation-period determination; Throat striking implements
- A61B10/02—Instruments for taking cell samples or for biopsy
- A61B10/06—Biopsy forceps, e.g. with cup-shaped jaws
Abstract
BIPOLAR BIOPSY DEVICE UTILIZING A ROTATABLE, SINGLE-HINGED MOVING ELEMENT
ABSTRACT OF THE DISCLOSURE
A bipolar biopsy device for removing tissue samples for biopsy purposes or other purposes. The bipolar biopsy device has an elongated flexible end and a lumen extending therebetween. A
cutting head is mounted on the distal end and has a hollow fixed member containing an electrode having an electrical surface thereon and a hollow cup-shaped moveable relative to the fixed member. The electrode surfaces are electrically connected to an outside voltage source.
A handle is affixed to the proximal end and a core wire is affixed to the handle which extends through the lumen and is affixed to the movable hollow cup-shaped member. The core wire manipulated by way of the handle facilitates the movement of the movable cup-shaped member. Tissue samples are obtained by positioning the electrode surfaces close to each other about the tissue sample. An arc is created to break tissue down by applying a voltage to the 2 electrode surfaces. The cut tissue remains within the cup-shaped members as the device is withdrawn from the body for later biopsy purposes.
ABSTRACT OF THE DISCLOSURE
A bipolar biopsy device for removing tissue samples for biopsy purposes or other purposes. The bipolar biopsy device has an elongated flexible end and a lumen extending therebetween. A
cutting head is mounted on the distal end and has a hollow fixed member containing an electrode having an electrical surface thereon and a hollow cup-shaped moveable relative to the fixed member. The electrode surfaces are electrically connected to an outside voltage source.
A handle is affixed to the proximal end and a core wire is affixed to the handle which extends through the lumen and is affixed to the movable hollow cup-shaped member. The core wire manipulated by way of the handle facilitates the movement of the movable cup-shaped member. Tissue samples are obtained by positioning the electrode surfaces close to each other about the tissue sample. An arc is created to break tissue down by applying a voltage to the 2 electrode surfaces. The cut tissue remains within the cup-shaped members as the device is withdrawn from the body for later biopsy purposes.
Description
4 ~ 3 B~POLAR BIOPSY DEVICE UTILIZING A ROTATABLE, SINGLE-IIINGED MOVING ELEMENT
FIELD OF TIIE INVENTION
The present invention relates to bipolar biopsy devices and, in particular, to a bipolar biopsy device utilizing a rotatable, sinyle hinged or unhinged moving element for its cutting head.
BACKGROUND OF THE INVENTI~N
obtaining tissue samples for diagnostic purposes is a commonly performed surgical procedure known as a biopsy. Such a procedure requires two steps: cutting a tissue sample and then retrieving the cut sample. Electrosurgical devices are a well known surgical instrument. Such devices cut the tissue by applying a voltage across two electrodes, creating an arc discharye which creates such a high heat energy that the cells comprising the tissue break down. Electrosurgical cutting has been utilized on catheters for a less invasive procedure such as shown in U.S. Patent 4,976,711 to Parins et al.
The prior art has shown various ways to retrieve the cut tissue. U.S. Patent 4,655,216 to Tischer utilizes an open ended basket. U.S. Patent q,953,559 to Salerno utilizes a cup shaped forceps on the end of a linkage arm.
What is needed is a biopsy device which is minimally invasive by utilizing electric surgical cutting and coagulating and a means to retrieve the cut tissue sample withou~ the complicated linkage arms.
Therefore the primary object of the present invention is to provide a b;polar blopsy device providing for electrosurgical cutting and coagulation by way of a catheter containing a cutting electrode which is moveable by manipulation of a core wire.
. .
, - ~O~a~Q3 Another object of the invention is to utiliz~ a rotatable, single-hinyed moving element having mating electrodes for the cutting head.
Yet another object of the invention is to provide a ~iopsy device with a RF cutting/coagulating head on the distal end of a catheter, the head having a member reciprocably moveable xelative to a member fixed to the catheter by utilizing a core wire running the length of the catheter.
Another object of the invention is to provide a bipolar electrode biopsy device having varying means for rotationally journaling the cutting head.
SUMMARY OF T~IE INVENTION
The present invention is a device for performing a cutting operation electrosurgically and especially designed to capture a severed tissue sample for subsequent analysis. The device comprises an elongated tube having a specially designed cutting head on the distal end thereof. In accordance with a first embodiment the cutting head is rotatably mounted on the distal end of the tube. By rotating a central core wire, the cutting head can be made to spin or rotate 360 degrees.
The head itself comprises a fixed member and a movable member pivotally secured to the fixed member. A first electrode surfacè is provided on the fixed member and a corresponding second electrode surface on the movable member. When the two electrode surf~aces are brought together about a piece of tissue, and an appropriate RF voltage is applied to the instrument, electrosurgical cutting or coagulation can take place. The movable member is opened and closed by advancing and retracting a core wire. The cut tissue sample is captured in a cup-like cavity formed within the Eixed and movable member.
FIELD OF TIIE INVENTION
The present invention relates to bipolar biopsy devices and, in particular, to a bipolar biopsy device utilizing a rotatable, sinyle hinged or unhinged moving element for its cutting head.
BACKGROUND OF THE INVENTI~N
obtaining tissue samples for diagnostic purposes is a commonly performed surgical procedure known as a biopsy. Such a procedure requires two steps: cutting a tissue sample and then retrieving the cut sample. Electrosurgical devices are a well known surgical instrument. Such devices cut the tissue by applying a voltage across two electrodes, creating an arc discharye which creates such a high heat energy that the cells comprising the tissue break down. Electrosurgical cutting has been utilized on catheters for a less invasive procedure such as shown in U.S. Patent 4,976,711 to Parins et al.
The prior art has shown various ways to retrieve the cut tissue. U.S. Patent 4,655,216 to Tischer utilizes an open ended basket. U.S. Patent q,953,559 to Salerno utilizes a cup shaped forceps on the end of a linkage arm.
What is needed is a biopsy device which is minimally invasive by utilizing electric surgical cutting and coagulating and a means to retrieve the cut tissue sample withou~ the complicated linkage arms.
Therefore the primary object of the present invention is to provide a b;polar blopsy device providing for electrosurgical cutting and coagulation by way of a catheter containing a cutting electrode which is moveable by manipulation of a core wire.
. .
, - ~O~a~Q3 Another object of the invention is to utiliz~ a rotatable, single-hinyed moving element having mating electrodes for the cutting head.
Yet another object of the invention is to provide a ~iopsy device with a RF cutting/coagulating head on the distal end of a catheter, the head having a member reciprocably moveable xelative to a member fixed to the catheter by utilizing a core wire running the length of the catheter.
Another object of the invention is to provide a bipolar electrode biopsy device having varying means for rotationally journaling the cutting head.
SUMMARY OF T~IE INVENTION
The present invention is a device for performing a cutting operation electrosurgically and especially designed to capture a severed tissue sample for subsequent analysis. The device comprises an elongated tube having a specially designed cutting head on the distal end thereof. In accordance with a first embodiment the cutting head is rotatably mounted on the distal end of the tube. By rotating a central core wire, the cutting head can be made to spin or rotate 360 degrees.
The head itself comprises a fixed member and a movable member pivotally secured to the fixed member. A first electrode surfacè is provided on the fixed member and a corresponding second electrode surface on the movable member. When the two electrode surf~aces are brought together about a piece of tissue, and an appropriate RF voltage is applied to the instrument, electrosurgical cutting or coagulation can take place. The movable member is opened and closed by advancing and retracting a core wire. The cut tissue sample is captured in a cup-like cavity formed within the Eixed and movable member.
2 0 ~ 3 In an alt:ernative embodiment the movable member is affixed to the end of the core wire and movable longitudinally therewith instead of being pivotally coupled to the fixed member. The movable member can be advanced and retracted longitudinally to an electrode surface on the fixed member of the instrument. By appropriate manipulation oE the core wire at its proximal end.
The electrode surfaces extend along the entire circumference of each cutting head member, thereby eliminating the need for rotational movement.
DESCRIPTION OF THE DRAWINGS
The foregolny features and advantages of the invention will become apparent to those skilled in the art from the following detailed description of the present invention, in which like numerals in the several ~ ews refer to corresponding parts.
Figure 1 is a partial side sectional view showing the proximal and rlistal ends of the electrosurgical biopsy device of the present invention.
Figure 2 is an enlarged view of the distal portion of the device oE Figure 1 showing the cutting head in its closed position.
Figure 3 is an enlarged view oE the distal portion of the invention of Figure 1 showing the cutting head in an open position.
Figure 4 is a view taken along line 4-4 of ~igure 3.
Figure 5 is an enlarged view of the distal portion of an alternative embodiment in a closed position with broken lines showing an open position.
Figure 6 is a view taken along line 6-6 of Figure 5.
~ o ~
DESCRIPTION OF THE PREFERRED EMBODIMENT
~ igure 1 depicts the general configuration of the bipolar biopsy device which is indicated generally by numeral 5 and utilizes a rotatable, single-hinged, pivotable element. The device has an elongated, flexible tubular member 10 having a proximal end 15, a distal end 20, and a cutting head 30. The tubular member 10 is surrounded by a sheath 25. A core wire 28 extends through the lumen of the tubular member 10. Affixed to the distal end 20 is a rota-table, single-hinged moving element 0 WhiC}I comprises the head 30 and which will be more fully described later in this specification.
Affixed to the proximal end of the tubular member 10 is a handle indicated generally by numeral 35. The handle preferably comprised a mo:Lded plastic cylindrical body 36 having a longitudinal slot 37 formed therethrough and disposed within the slot is a knurled knob 40 for providing rotational movement to the cutting head 30. More particularly, knob 40 is affixed to a core wire 28 ~hich passes loosely through aliyned apertures formed in the proximal end 38 and to distal end 39 of the handle 35. By way of a bearing means (spring 45~ and a thumb-engageable ring member 50, reciprocal movement is provided to the cutting head by way of core wire 28. The handle 35 contains ~inger Elanges 60 anl G2 for ease in gripping the handle and manipulating ring. Also connected to the handle and not shown is means for connecting the device to a voltage source.
The tubular member 10 and sheath 25 are made from a medical ~rade plastic such as nylon, polye-thylene or TEFLON~
polypropylene. The tubular member 10 can be withdrawn into the sheath 25 during introduction of the bipolar biopsy device 5 into a body lumen or cavity.
2 0 ~ a ~ ~ 3 The cut-ting head COllSiStS of a fixed member 65 attached to the tubular catheter 10 and movable member 70 pivotally attached to the fixed member. In the first embodiment, shown in Figures 2 and 3, the movable member 70 has a hol]ow hemispherical or cup shape and is pivotally hinged to the hollow fixed member at 75.
When the cutting head 30 is in the closed position, a closed cavity 80 is formed therein. The core wire 28 is connected to the movable cup member as shown at 85. A first electrode surEace 90 is located on the fixed member 65 and a second electrode surface is located on the movable member 7~. The electrodes are ideally made of tungsten or stainless steel but other materials may also be used. The electrode surface does not extend around the entire circumference of the moveable or fixed member. As shown in Figure 4, the edges of the surface are separated by about a 90 angle. I'his optimal angle ensures the proper arc is created without creating a short circuit at the hinged area.
Core wire 28 is connected to an outside voltage source not shown and contains two wires 98 and 99 insulated from each other for applying the voltage across the first and second electrical surfaces. ~ first lead 100 runs from the core wire 28 to the first electrode surface 90 on the fixed member 65 and a second lead 105 (figure 4) runs from the core wire 28 to the second electrode surface 95. The two insulated wires do not need to be contained within the core wire 28. Other arrangements, such as having the wires separately extend through the tubular member, are acceptable.
In the alternative embodiment shown in Figure 5 the movab]e member 110 is not pivotally hinged to the fixed portion 115 and does not contain a bearing means for allowinq the cutting head .~.. .. . .
~3~3 assembly to rotate. lnstead, the movable member 110 is connected to the device by means of the core wire 111 attached at 112.
Like the cutting head of the first embodiment, the fixed member 11~ is generally hollow. However, in this embodiment the entire fixed member 120 operates as the first electrode and can be conveniently fabricated from a suitable metal. As before, the movable member 110 has a hollow cup shape and operates as the second electrode 130. The electrodes on both me~bers extend about the entire circumference as shown in Figure 6.
As with the first embodiment, two insulated wires extending through the lumen of the member 10 are necessary to connect the electrodes to the voltage source (not shown). Furthermore, the two wires are not restricted to the core wire interior. Other suitable arrangements, such as having the wires separately extend throuy}l the tubular member, are acceptable~
In operation, and first considering the embodiment of Figures 1-3, the elongated tube 10 and cutting head 30 within the sheath 25 are routed through the pat:ient to the area to be electrosurgically cut. Upon reaching the site, the cutting head 30 is a~vanced dis-tally relative to the sheath 25 until the head is exposed. The movable member 70 is opened relative to the fixed member 65 by manipulating the core wire 28 using the thumb-ring 50 on the handle 35 and a tissue sample for later biopsy procedures is positioned between the two electrode surfaces 90 and 95. As the electrodes are closed relative to one another and a voltage is applied to the electrode surfaces, an arc is created therebetween ~or cutting the tissue. The cutting head 30 may then be completely closed, thereby retaining the cut tissue within the cavity portion 80 as it is drawn into the sheath 25.
The cutting head 30 and elongated tube 10 may be removed from the 2 ~
body while retaining the tissue within the cutting head 30 for later biopsy purposes. It is also possible -to obtain multiple samples by repeating the above procedure but without withdrawing tlle instrumenc between cuttings. The moveable member 70 is opened and closed by advancing and retracting the core wire 28 by manipulation of ring member 50 on the handle. The rotational knob 40 and bearing means (spring 45) allow the operator to rotate the cutting head 35 in its cutting location for obtaining tissue samples nearby without moving the entire tubular member 10 and sheath 25 within the patient's body.
The alternative embodiment shown in Figure 4 operates as follows. When the core wire 28 is manipulated with the thumb-ring, the entire moveable llo member can be reciprocated, thus enabling the cutting head to first be opened wider and then closed after a tissue sample is selected for excision.
Furthermore as shown in Figure 6, because the segments 110 and 115 are fabricated totally from metal, electrode surfaces 120 and 130 extend completely around the circumference of the fixed and moveable members since.
The invention is versatile and can be usPd for non-biopsy surgical procedures such as removing plaque deposits in blood vessels, removing polyps from the intestinal wall and other comparable procedures.
The invention has been described here in considerable detail in order to comply with the patent statutes and to provide those skilled in the art with the information needed to apply the novel principles and to construct and use such sp~cialized components as are required. However, it is to be understood that the invention can be carried out by specifically different equipment and devices, and that the various modifications, both 2~403 as to the e~u.i.pment de-tails in operating proce(~ures, can be accomplished without departing from the scope of the invention itself.
What is claimed is:
... . .. .. ..
The electrode surfaces extend along the entire circumference of each cutting head member, thereby eliminating the need for rotational movement.
DESCRIPTION OF THE DRAWINGS
The foregolny features and advantages of the invention will become apparent to those skilled in the art from the following detailed description of the present invention, in which like numerals in the several ~ ews refer to corresponding parts.
Figure 1 is a partial side sectional view showing the proximal and rlistal ends of the electrosurgical biopsy device of the present invention.
Figure 2 is an enlarged view of the distal portion of the device oE Figure 1 showing the cutting head in its closed position.
Figure 3 is an enlarged view oE the distal portion of the invention of Figure 1 showing the cutting head in an open position.
Figure 4 is a view taken along line 4-4 of ~igure 3.
Figure 5 is an enlarged view of the distal portion of an alternative embodiment in a closed position with broken lines showing an open position.
Figure 6 is a view taken along line 6-6 of Figure 5.
~ o ~
DESCRIPTION OF THE PREFERRED EMBODIMENT
~ igure 1 depicts the general configuration of the bipolar biopsy device which is indicated generally by numeral 5 and utilizes a rotatable, single-hinged, pivotable element. The device has an elongated, flexible tubular member 10 having a proximal end 15, a distal end 20, and a cutting head 30. The tubular member 10 is surrounded by a sheath 25. A core wire 28 extends through the lumen of the tubular member 10. Affixed to the distal end 20 is a rota-table, single-hinged moving element 0 WhiC}I comprises the head 30 and which will be more fully described later in this specification.
Affixed to the proximal end of the tubular member 10 is a handle indicated generally by numeral 35. The handle preferably comprised a mo:Lded plastic cylindrical body 36 having a longitudinal slot 37 formed therethrough and disposed within the slot is a knurled knob 40 for providing rotational movement to the cutting head 30. More particularly, knob 40 is affixed to a core wire 28 ~hich passes loosely through aliyned apertures formed in the proximal end 38 and to distal end 39 of the handle 35. By way of a bearing means (spring 45~ and a thumb-engageable ring member 50, reciprocal movement is provided to the cutting head by way of core wire 28. The handle 35 contains ~inger Elanges 60 anl G2 for ease in gripping the handle and manipulating ring. Also connected to the handle and not shown is means for connecting the device to a voltage source.
The tubular member 10 and sheath 25 are made from a medical ~rade plastic such as nylon, polye-thylene or TEFLON~
polypropylene. The tubular member 10 can be withdrawn into the sheath 25 during introduction of the bipolar biopsy device 5 into a body lumen or cavity.
2 0 ~ a ~ ~ 3 The cut-ting head COllSiStS of a fixed member 65 attached to the tubular catheter 10 and movable member 70 pivotally attached to the fixed member. In the first embodiment, shown in Figures 2 and 3, the movable member 70 has a hol]ow hemispherical or cup shape and is pivotally hinged to the hollow fixed member at 75.
When the cutting head 30 is in the closed position, a closed cavity 80 is formed therein. The core wire 28 is connected to the movable cup member as shown at 85. A first electrode surEace 90 is located on the fixed member 65 and a second electrode surface is located on the movable member 7~. The electrodes are ideally made of tungsten or stainless steel but other materials may also be used. The electrode surface does not extend around the entire circumference of the moveable or fixed member. As shown in Figure 4, the edges of the surface are separated by about a 90 angle. I'his optimal angle ensures the proper arc is created without creating a short circuit at the hinged area.
Core wire 28 is connected to an outside voltage source not shown and contains two wires 98 and 99 insulated from each other for applying the voltage across the first and second electrical surfaces. ~ first lead 100 runs from the core wire 28 to the first electrode surface 90 on the fixed member 65 and a second lead 105 (figure 4) runs from the core wire 28 to the second electrode surface 95. The two insulated wires do not need to be contained within the core wire 28. Other arrangements, such as having the wires separately extend through the tubular member, are acceptable.
In the alternative embodiment shown in Figure 5 the movab]e member 110 is not pivotally hinged to the fixed portion 115 and does not contain a bearing means for allowinq the cutting head .~.. .. . .
~3~3 assembly to rotate. lnstead, the movable member 110 is connected to the device by means of the core wire 111 attached at 112.
Like the cutting head of the first embodiment, the fixed member 11~ is generally hollow. However, in this embodiment the entire fixed member 120 operates as the first electrode and can be conveniently fabricated from a suitable metal. As before, the movable member 110 has a hollow cup shape and operates as the second electrode 130. The electrodes on both me~bers extend about the entire circumference as shown in Figure 6.
As with the first embodiment, two insulated wires extending through the lumen of the member 10 are necessary to connect the electrodes to the voltage source (not shown). Furthermore, the two wires are not restricted to the core wire interior. Other suitable arrangements, such as having the wires separately extend throuy}l the tubular member, are acceptable~
In operation, and first considering the embodiment of Figures 1-3, the elongated tube 10 and cutting head 30 within the sheath 25 are routed through the pat:ient to the area to be electrosurgically cut. Upon reaching the site, the cutting head 30 is a~vanced dis-tally relative to the sheath 25 until the head is exposed. The movable member 70 is opened relative to the fixed member 65 by manipulating the core wire 28 using the thumb-ring 50 on the handle 35 and a tissue sample for later biopsy procedures is positioned between the two electrode surfaces 90 and 95. As the electrodes are closed relative to one another and a voltage is applied to the electrode surfaces, an arc is created therebetween ~or cutting the tissue. The cutting head 30 may then be completely closed, thereby retaining the cut tissue within the cavity portion 80 as it is drawn into the sheath 25.
The cutting head 30 and elongated tube 10 may be removed from the 2 ~
body while retaining the tissue within the cutting head 30 for later biopsy purposes. It is also possible -to obtain multiple samples by repeating the above procedure but without withdrawing tlle instrumenc between cuttings. The moveable member 70 is opened and closed by advancing and retracting the core wire 28 by manipulation of ring member 50 on the handle. The rotational knob 40 and bearing means (spring 45) allow the operator to rotate the cutting head 35 in its cutting location for obtaining tissue samples nearby without moving the entire tubular member 10 and sheath 25 within the patient's body.
The alternative embodiment shown in Figure 4 operates as follows. When the core wire 28 is manipulated with the thumb-ring, the entire moveable llo member can be reciprocated, thus enabling the cutting head to first be opened wider and then closed after a tissue sample is selected for excision.
Furthermore as shown in Figure 6, because the segments 110 and 115 are fabricated totally from metal, electrode surfaces 120 and 130 extend completely around the circumference of the fixed and moveable members since.
The invention is versatile and can be usPd for non-biopsy surgical procedures such as removing plaque deposits in blood vessels, removing polyps from the intestinal wall and other comparable procedures.
The invention has been described here in considerable detail in order to comply with the patent statutes and to provide those skilled in the art with the information needed to apply the novel principles and to construct and use such sp~cialized components as are required. However, it is to be understood that the invention can be carried out by specifically different equipment and devices, and that the various modifications, both 2~403 as to the e~u.i.pment de-tails in operating proce(~ures, can be accomplished without departing from the scope of the invention itself.
What is claimed is:
... . .. .. ..
Claims (33)
1. A bipolar biopsy device comprising:
a. an elongated flexible tubular member having a proximal end, a distal end, and a lumen extending from said proximal end to said distal end;
b. a handle affixed to said proximal end;
c. a core wire extending through said lumen, said core wire affixed to said handle for facilitating reciprocal movement of said core wire;
d. A cutting head mounted on the distal end of said tubular member, said cutting head comprising:
i. a hollow fixed member having a first electrode surface thereon and mounted on said distal end of said tubular member.
ii. a hollow cup-shaped member having a second electrode surface thereon and movable relative to said fixed member.
e. bearing means for rotationally journaling said cutting head; and f. conductor means extending from said proximal end of said tubular member to said first and second electrode surfaces for applying a voltage across said first and second electrode surfaces.
a. an elongated flexible tubular member having a proximal end, a distal end, and a lumen extending from said proximal end to said distal end;
b. a handle affixed to said proximal end;
c. a core wire extending through said lumen, said core wire affixed to said handle for facilitating reciprocal movement of said core wire;
d. A cutting head mounted on the distal end of said tubular member, said cutting head comprising:
i. a hollow fixed member having a first electrode surface thereon and mounted on said distal end of said tubular member.
ii. a hollow cup-shaped member having a second electrode surface thereon and movable relative to said fixed member.
e. bearing means for rotationally journaling said cutting head; and f. conductor means extending from said proximal end of said tubular member to said first and second electrode surfaces for applying a voltage across said first and second electrode surfaces.
2. A bipolar biopsy device of claim 1 wherein said conductor means includes a first and second elongated wire insulated from each other said first wire of said conductor means being electrically joined to said first electrode surface and said second wire being electrically joined to said second electrode surface.
3. The bipolar biopsy device of claim 1 wherein said electrode surfaces are tungsten.
4 The bipolar biopsy device of claim 1 wherein said voltage applied between said first and second electrode surfaces is sufficient to cut tissue.
5. The bipolar biopsy device as in claim 1 wherein said conductor means comprise said core wire.
6. The bipolar biopsy device of claim 1 wherein said tubular member is made from a medical grade plastic.
7. The bipolar biopsy device of claim l further including a tubular sheath surrounding said tubular member.
8. The bipolar biopsy device of claim 7 wherein said tubular sheath is made from a medical grade plastic.
9. The bipolar biopsy device of claim 1 wherein said core wire is coaxially aligned within said tubular member.
10. The bipolar biopsy device of claim 1 wherein said bearing means is a spring.
11. The bipolar biopsy device of claim 1 wherein said hollow cup-shaped member is pivotally attached to said hollow fixed member.
12. The bipolar biopsy device of claim 1 wherein said fixed member is attached to said bearing means for rotationally journaling said cutting head.
13. The bipolar biopsy device of claim 1 wherein said hollow cup-shaped member is reciprocally moveable relative to said fixed member.
14. A bipolar biopsy device comprising:
a. an elongated, flexible tubular member having a proximal end, a distal end, and a lumen extending from said proximal end to said distal end;
b. a cutting head mounted on said distal end of said tubular member, said cutting head comprising:
i. a hollow fixed member having a first electrode surface;
ii. a movable hollow cup-shaped member and having a second electrode surface;
c. a handle affixed to said proximal end;
d. a core wire extending through said lumen, said core wire hinged to interior of said movable hollow cup-shaped member and fixed to said handle for facilitating reciprocal movement of said core wire;
e. conductor means extending from said proximal end of said tubular member to said first and second electrodes for applying a voltage across said first and second electrodes.
a. an elongated, flexible tubular member having a proximal end, a distal end, and a lumen extending from said proximal end to said distal end;
b. a cutting head mounted on said distal end of said tubular member, said cutting head comprising:
i. a hollow fixed member having a first electrode surface;
ii. a movable hollow cup-shaped member and having a second electrode surface;
c. a handle affixed to said proximal end;
d. a core wire extending through said lumen, said core wire hinged to interior of said movable hollow cup-shaped member and fixed to said handle for facilitating reciprocal movement of said core wire;
e. conductor means extending from said proximal end of said tubular member to said first and second electrodes for applying a voltage across said first and second electrodes.
15. The bipolar biopsy device of claim 14 wherein said electrodes are tungsten.
16. The bipolar biopsy device of claim 14 wherein said cutting head has a diameter at most the diameter of said tubular member.
17. The biopsy device of claim 14 wherein said tubular member is made from a medical grade plastic.
18. A bipolar biopsy device of claim 14 wherein said core wire comprises said conductor means and includes a first and second elongated wires insulated from each other with the first wire electrically jointed to said first electrode surface and said second wire electrically joined to said second electrode surface.
19. The bipolar biopsy device of claim 14 wherein said electrode surfaces are tungsten.
20. The bipolar biopsy device of claim 14 wherein said voltage applied between said first and second electrode surfaces is sufficient to cut tissue.
21. The bipolar biopsy device of claim 14 wherein said tubular member is made from a medical grade plastic.
22. The bipolar biopsy device of claim 14 further including a tubular sheath surrounding said tubular member.
23. The bipolar biopsy device of claim 22 wherein said tubular sheath is made from a medical grade plastic.
24. The bipolar biopsy device of claim 14 wherein said core wire is coaxially aligned within said tubular member.
25. A bipolar biopsy device comprising:
a. an elongated, flexible tubular member having a proximal end, a distal end, and a lumen extending from said proximal end to said distal end;
b. a cutting head mounted on said distal end of said tubular member, said cutting head comprising:
i. a hollow fixed member having a first electrode surface;
ii. a hollow cup-shaped member moveable relative to said fixed member and having a second electrode surface;
c. a handle affixed to said proximal end;
d. a core wire extending through said lumen, said core wire connected to interior of said movable hollow cup-shaped member and fixed to said handle for facilitating movement of said core wire; and e. conductor means extending from said proximal end of said tubular member to said first and second electrodes for applying a voltage across said first and second electrodes.
a. an elongated, flexible tubular member having a proximal end, a distal end, and a lumen extending from said proximal end to said distal end;
b. a cutting head mounted on said distal end of said tubular member, said cutting head comprising:
i. a hollow fixed member having a first electrode surface;
ii. a hollow cup-shaped member moveable relative to said fixed member and having a second electrode surface;
c. a handle affixed to said proximal end;
d. a core wire extending through said lumen, said core wire connected to interior of said movable hollow cup-shaped member and fixed to said handle for facilitating movement of said core wire; and e. conductor means extending from said proximal end of said tubular member to said first and second electrodes for applying a voltage across said first and second electrodes.
26. A bipolar biopsy device of claim 25 wherein said core wire includes said conductor means, said conductor means comprising a first and a second elongated wire insulated from each other, said first wire of said conductor means being electrically jointed to said first electrode surface and said second wire of said conductor means electrically joined to said second electrode surface.
27. The bipolar biopsy device of claim 25 wherein said electrode surfaces are tungsten.
28. The bipolar biopsy device of claim 25 wherein said voltage applied between said first and second electrode surfaces is sufficient to cut tissue.
29. The bipolar biopsy device of claim 25 wherein said tubular member is made from a medical grade plastic.
30. The bipolar biopsy device of claim 25 further including a tubular sheath surrounding said tubular member.
31. The bipolar biopsy device of claim 30 wherein said tubular sheath is made from a medical grade plastic.
32. The bipolar biopsy device of claim 25 wherein said core wire is coaxially aligned within said tubular member.
33. The bipolar biopsy device of claim 25 wherein said moveable hollow cup-shaped member is attached to bearing means for rotationally journaling said cup-shaped member relative to said tubular member.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US07/866,191 | 1992-04-09 | ||
US07/866,191 US5217458A (en) | 1992-04-09 | 1992-04-09 | Bipolar biopsy device utilizing a rotatable, single-hinged moving element |
Publications (1)
Publication Number | Publication Date |
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CA2085403A1 true CA2085403A1 (en) | 1993-10-10 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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CA002085403A Abandoned CA2085403A1 (en) | 1992-04-09 | 1992-12-15 | Bipolar biopsy device utilizing a rotatable, single-hinged moving element |
Country Status (4)
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US (1) | US5217458A (en) |
EP (1) | EP0564743A1 (en) |
JP (1) | JPH05337114A (en) |
CA (1) | CA2085403A1 (en) |
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-
1992
- 1992-04-09 US US07/866,191 patent/US5217458A/en not_active Expired - Fee Related
- 1992-12-15 CA CA002085403A patent/CA2085403A1/en not_active Abandoned
- 1992-12-24 EP EP92311788A patent/EP0564743A1/en not_active Withdrawn
-
1993
- 1993-02-18 JP JP5028719A patent/JPH05337114A/en active Pending
Also Published As
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JPH05337114A (en) | 1993-12-21 |
EP0564743A1 (en) | 1993-10-13 |
US5217458A (en) | 1993-06-08 |
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