US20030045872A1 - Instrument for interrupting conduction paths within the heart - Google Patents

Abstract

A probe for making transmural lesions in one or more walls of the atria of the heart in open-heart surgery. The lesion blocks electrical impulses in a direction crosswise to the lesion. The probe has a handle (1), a closed electrode (2) at an end of the probe, a relatively rigid member (5) of physiologically acceptable plastic connecting the probe and the electrode, and means (6, 7) for coupling the probe to an RF power source.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS
• This is a continuation of application Ser. No. 09/583,303, filed May 30, 2000, which is a divisional of application Ser. No. 09/180,124 filed Nov. 2, 1998, which is the U.S. national phase of PCT application No. PCT/NL97/00223 filed Apr. 25, 1997, which claims priority from Netherlands application No. 1003021, filed May 3, 1996.[0001]
FIELD OF THE INVENTION
• The invention relates to an instrument for making at least one transmural lesion in one or more walls of the atria of the heart, which lesion essentially blocks the electrical impulse conduction in a direction crosswise to the transmural lesion.[0002]
BACKGROUND OF THE INVENTION
• All kinds of heart arrhythmias, and in particular chronic and paroxysmal atrial fibrillation, can currently be treated by surgery.[0003]
• A known surgical procedure (MAZE) was designed to eliminate atrial fibrillation permanently. In this procedure incisions are made with a scalpel in the walls of the atria, in order to block electrical impulse conduction in a direction crosswise to the incisions, by the interruption of the tissue continuity. As a result of the subsequent scarring, these electrical blocks acquire a permanent character.[0004]
• This known technique is as yet performed only to a limited extent worldwide, owing to the complexity of the operation. The increased risk is particularly associated with the duration of the operation and the way in which the operation has to be carried out.[0005]
• The duration of the operation, and in particular the cross-clamp time (x-clamp) is so long that there is a great risk of damage to the heart muscle.[0006]
• The cross-clamp time required for the MAZE procedure alone is currently still an average of 68 min. (range 50-102 min.), and the necessary time on the heart-lung machine is on[0007]average 182 min. (range 130-256 min.). For further data you are referred to Atrial Fibrillations: Mechanisms and Therapeutic Strategies, Futura Publishing Co. Inc. Armonk, N.Y. 1994. J. L. Cox: Surgical Interruption of Atrial Reentry as a Cure for Atrial Fibrillation. The way in which the operation is performed with the scalpel produces an increased risk of vascular suture leaks and subsequent bleeding, due to the large number and location of the vascular sutures involved.
SUMMARY OF THE INVENTION
• The object of the present invention is to provide an instrument of the above-mentioned type which eliminates the abovementioned disadvantages, and which in particular shortens the time required for the operation and reduces the risk of bleeding and damage, therefore reducing the risk for the patient in open-heart surgery.[0008]
• According to the invention, the instrument indicated is characterized in that the instrument is a probe in which the end which during the operation comes into contact with the wall to be treated is a closed electrode which can interact with an RF power source, while the probe is of a relatively rigid type.[0009]
• The instrument according to the invention is a probe by means of which in open-heart surgery it is possible to make a permanent change in an atrial wall which is transmural, i.e. it extends over the entire thickness of the wall.[0010]
• As will be discussed at a later stage, during the performance of the operation the electrode at the end of the probe is brought into contact with the atrial wall to be treated and is moved along it in a linear pattern. On excitation of the electrode with RF power, dielectric (RF) heating of the wall tissue occurs. The RF treatment produces a change in the cell structure of the atrial wall, with the result that electrical impulse conduction in a direction crosswise to the transmural lesion is blocked.[0011]
• In order to be able to work well with it, the probe must be of a relatively rigid type, so that the electrode can be accurately positioned on and moved along the atrial wall. In the operation no disintegration of the tissue of the atrial wall occurs, and there is no risk of subsequent bleeding. The operation can be carried out on the outside or the inside of the atrium as desired.[0012]
• Methods of RF heating or dielectric heating are based on the use of heat generated in materials which are relatively poor electrical conductors when they are placed in high-frequency electromagnetic fields. The heat is generated as a result of dielectric losses occurring in a material situated between metal electrodes which form a capacitor which is connected to a high-frequency (RF) generator. Such heating is highly uniform and therefore extremely suitable for use of the instrument, the probe, according to the invention. During use of the probe, one of the capacitor “plates” is formed by the electrode at the end of the probe, while the other “plate” is a counter-electrode which is stuck on, for example, the patient's back; when the latter electrode is being placed, it is preferable to use a contact gel which has electrical conductance. Of course, the counter-electrode can also be placed on the outside of the atrial wall of the heart, for example if the electrode of the probe is being brought into contact with the inside of said wall.[0013]
• In connection with the invention, reference is made to WO 95/03742, which discloses a catheter comprising at the distal a metal electrode by means of which tissue erosion, also known as ablation, can be carried out.[0014]
• Such a catheter typically has a length of approximately 1 meter, a diameter of approximately 2 mm, and has an electrode of approximately 2 mm diameter, and its low thickness makes it very flexible, so that it can follow a blood vessel without any problems. This catheter is suitable for local punctate ablation. Such a catheter is not suitable for use as a probe for making stripe-shaped transmural lesions in an atrial wall.[0015]
• In particular, the probe according to the invention has at least a handle; an end; a relatively rigid member, such as a shaft, between the handle and the end, and connecting and conduction means for connecting the end of the probe to an RF power source.[0016]
• In the instrument according to the invention a temperature recorder is advantageously present near the end of the probe, which temperature recorder, operating in a feedback system with the RF power source, can regulate the temperature of the end of the probe to a preset value. Through input of the RF power, the temperature of the end of the probe will generally rise; feedback with the RF power source makes it possible to ensure that the temperature of the end does not exceed a predetermined value.[0017]
• With use of RF power it is extremely important that the fewest possible electrical blockages should be present in the body section between the end of the probe and the counter-electrode on the outside of the body. On account of this, it is preferable to ensure that the probe can interact with means for supplying a physiologically acceptable liquid to the end thereof. In its simplest form, such a liquid is supplied near the electrode of the probe by way of a line which does not form part of the probe. The function of the liquid is, on the one hand, to cool the electrode and, on the other, to prevent the occurrence of electrically insulating air gaps which adversely affect the efficiency of the RF action.[0018]
• It is very advantageous for the probe according to the invention itself to have means for discharging a physiologically acceptable liquid near the end of the probe. Said liquid will generally preferably have a certain degree of electrical conduction, and is expediently a physiological salt solution.[0019]
• In a very attractive embodiment, the instrument has between the handle of the probe and the shaft inlet means for introducing the physiologically acceptable liquid, which inside the shaft remains electrically insulated from the connecting and conduction means present in the shaft, while near the end it has outflow means for the physiologically acceptable liquid. With this embodiment, the functioning of the probe can be improved yet further, and it can be ensured that the greatest RF energy effect is concentrated in the wall of the atrium to be treated, forming the desired transmural lesion.[0020]
• At the side of the handle facing away from the end of the probe, the conduction and connecting means of the probe according to the invention comprise a connector connected thereto, with contact means for connection of the electrode to the end of the probe and the temperature recorder present therein to the RF power source.[0021]
• The connector is preferably of the rapid coupling type, so that easy coupling to the RF power source is permitted.[0022]
• In order to make handling of the instrument according to the invention, in the form of a probe, as easy as possible for the operating surgeon during an open-heart operation, the shaft of the probe preferably has an intrinsic curvature, which is expediently approximately 140 degrees.[0023]
BRIEF DESCRIPTION OF THE DRAWINGS
• The invention will now be explained with reference to the drawing, in which:[0024]
• FIG. 1 shows a schematic picture of the transmural lesions which can be made with the instrument according to the invention, and which can block electrical impulses in directions crosswise to said lesions;[0025]
• FIG. 2 shows an instrument according to the invention in a first embodiment;[0026]
• FIG. 3 shows an instrument according to the invention in a second embodiment.[0027]
DETAILED DESCRIPTION OF THE DRAWINGS
• FIG. 1 shows diagrammatically in a two-dimensional view the two atria of a human heart, in which the transmural lesions are indicated by reference letter C, the undisturbed electrical impulses by A, and the blocked electrical impulses by B. The lesions C are in the nature of scar tissue which is formed after treatment using the probe according to the invention. The atria, as viewed epicardially, include the[0028]left atrium100 and theright atrium101. Structural features of the atria include thepulmonary veins110, theinferior vena cava120, thesuperior vena cava130, the leftatrial appendage140 and the rightatrial appendage150. Afirst lesion160 is a curved lesion that is joined end-to-end such that it encircles thepulmonary veins110, and is between thepulmonary veins110 and conductive pathways in theleft atrium100 and between thepulmonary veins110 and conductive pathways in theright atrium101. Asecond lesion165 extends between thesuperior vena cava130 and theinferior vena cava120 and blocks a firstconductive pathway167. Athird lesion170 extends across theleft atrium100 from anintersection171 with a portion of thefirst lesion160 toward the leftatrial appendage140 and blocks a secondconductive pathway172. Afourth lesion175 extends along theright atrium101 laterally from anintersection176 with a portion of thesecond lesion165. Afifth lesion180 extends from a portion of thefirst lesion160 along theleft atrium100 and blocks a thirdconductive pathway182. Asixth lesion185 extends along theright atrium101 toward the rightatrial appendage150.
• FIG. 2 shows a probe according to the invention in a first embodiment, and shows a[0029]handle1, anactive metal end2 as a closed electrode with indication of the position of atemperature sensor3. The shaft of theprobe5 has acurvature4 of approximately 140 degrees, and inside the shaft run theelectrical wires6 for exciting the closed electrode-type end2 andwire7 for connecting the temperature sensor which is fitted at the position ofreference number3.
• Inside the[0030]handle1 are electrical switch means10 (not shown in any further detail) for permitting connection of the probe to the RF generator (not shown).Reference numbers8 and9 also indicate a connector making it possible to couple the probe to the RF generator.
• FIG. 3 shows a particularly advantageous embodiment of the probe according to the invention, which is identical to the probe of FIG. 2, but in which[0031]reference number11 indicates a Y-connector which makes it possible to supply a physiologically acceptable liquid by way of aport12 into theshaft5, said physiologically acceptable liquid being guided through theshaft5 without contact with the conduction means6 and7. The physiologically acceptable solution flows by way of theport12 to aninner shaft13, and from there by way of theshaft5 to the outflow ports14 which are disposed in the vicinity of themetal end2. The physiologically acceptable liquid is expediently a physiological salt solution which is readily tolerated by the body.
• The physiological salt solution, on the one hand, achieves cooling of the[0032]closed electrode2 and, on the other hand, lowers the electrical resistance between the closed electrode of theend2 and the atrial wall. Extremely good and reproducible results are obtained with the probe shown in the figure. The source of RF power is typically a generator which can deliver a power of, for example, maximum 50 watt at a frequency of 500 kHz. The power supplied is a function of the temperature set and the tissue contact of the electrode forming the end of the probe. The desired temperature can be set at the generator, and in general lies in the range 50 to 70 degrees C. If temperatures higher than the given range are permitted, burning of the tissue (coagulation) will occur, with the result that an insulating layer is formed; said layer will make further action of the RF energy difficult, with the result that underlying tissue is not treated fully, if at all.
• The[0033]end2 of the probe expediently comprises platinum and is typically a cylindrical shape with a diameter of 4 mm. The diameter can generally lie between 3 and 6 mm.
• The total length of the probe without connection means is typically approximately 35 cm, the handle being approximately 20 cm long, the shaft approximately 10 cm, and the end approximately 2 cm. In general, the length of the[0034]shaft5 lies between 8 and 15 cm, and the shaft has a diameter between 3 and 6 mm and is made of a physiologically acceptable plastic. Suitable plastics are nylon 66, polypropylene and high-density polyethylene.

Claims (14)

1. An instrument for supplying RF energy to body tissue, the instrument comprising a probe having:

a handle;

a closed electrode at one end of said probe, the instrument being adapted to allow said electrode to be accurately positioned on and moved along an atrium wall during open heart surgery and to make at least one transmural conduction blocking lesion in the atrium wall;

a connection and conduction means electrically communicating with said electrode and adapted for connecting said electrode to an RF power source;

a substantially rigid member connecting said handle and said electrode, said member formed of a physiologically acceptable plastic; and

means for supplying a physiologically acceptable liquid to said electrode, wherein said means for supplying the liquid is connected to said member,

wherein said probe is sufficiently rigid such that an operator grasping said handle of the instrument can accurately position and move said electrode along an atrium wall to be treated, whereby the instrument can be used in an open-heart operation to make at least one transmural conduction blocking lesion in the atrium wall.

2. The instrument ofclaim 1, wherein said member has an intrinsic curvature.

3. The instrument ofclaim 2, wherein said curvature of said member is approximately 140 degrees.

4. The instrument ofclaim 1, wherein said member has a length between approximately 8 and 15 cm.

5. The instrument ofclaim 1, wherein said physiologically acceptable liquid is a salt solution.

6. The instrument ofclaim 1, wherein said member is a shaft.

7. The instrument ofclaim 6, wherein said shaft has a diameter between approximately 3 and 6 mm.

8. The instrument ofclaim 6, wherein said means for supplying the physiologically acceptable liquid comprises an inner shaft located within said shaft connecting said handle and said electrode.

9. The instrument ofclaim 8, wherein said shaft connecting said handle and said electrode further comprises an inlet port for introducing the physiologically acceptable liquid into said inner shaft.

10. The instrument ofclaim 8, wherein said inner shaft comprises at least one outflow port disposed in the vicinity of said electrode.

11. The instrument ofclaim 1, wherein said electrode comprises platinum.

12. The instrument ofclaim 1, wherein said electrode is generally cylindrical.

13. The instrument ofclaim 12, wherein said electrode has a diameter between approximately 3 mm and 6 mm.

14. The instrument ofclaim 12, wherein said electrode has a length of approximately 2 cm.

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