CA2036286A1 - Implantable electrode and method for fabrication - Google Patents
Implantable electrode and method for fabricationInfo
- Publication number
- CA2036286A1 CA2036286A1 CA002036286A CA2036286A CA2036286A1 CA 2036286 A1 CA2036286 A1 CA 2036286A1 CA 002036286 A CA002036286 A CA 002036286A CA 2036286 A CA2036286 A CA 2036286A CA 2036286 A1 CA2036286 A1 CA 2036286A1
- Authority
- CA
- Canada
- Prior art keywords
- coil
- plastic
- tubing
- electrode
- plastic tube
- 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
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N1/00—Electrotherapy; Circuits therefor
- A61N1/02—Details
- A61N1/04—Electrodes
- A61N1/05—Electrodes for implantation or insertion into the body, e.g. heart electrode
- A61N1/056—Transvascular endocardial electrode systems
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/4902—Electromagnet, transformer or inductor
- Y10T29/49071—Electromagnet, transformer or inductor by winding or coiling
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49117—Conductor or circuit manufacturing
Abstract
IMPLANTABLE ELECTRODE AND METHOD
FOR FABRICATION
ABSTRACT
An implantable electrode of the type in which an elongated wire coil forms the electrode surface. The electrode coil is mounted around an insulative lead body and is stabilized on the lead body by means of a plastic filler between the individual turns of the electrode coil, extending radially outward to approximately one-third of the diameter of the electrode coil wire. The filler is produced by stretching a portion of the lead body which normally displays an outer diameter greater than the inner diameter of the electrode coil, sliding the electrode coil over the lead body and inserting a mandrel into the lead body to urge the lead body into contact with the electrode coil. This assembly is heated to encourage flow of the lead body into the spaces between the electrode coil to stabilize the coil on electrode body and to prevent fibrotic ingrowth around the electrode coil wire.
FOR FABRICATION
ABSTRACT
An implantable electrode of the type in which an elongated wire coil forms the electrode surface. The electrode coil is mounted around an insulative lead body and is stabilized on the lead body by means of a plastic filler between the individual turns of the electrode coil, extending radially outward to approximately one-third of the diameter of the electrode coil wire. The filler is produced by stretching a portion of the lead body which normally displays an outer diameter greater than the inner diameter of the electrode coil, sliding the electrode coil over the lead body and inserting a mandrel into the lead body to urge the lead body into contact with the electrode coil. This assembly is heated to encourage flow of the lead body into the spaces between the electrode coil to stabilize the coil on electrode body and to prevent fibrotic ingrowth around the electrode coil wire.
Description
2~3~2~
IMPLANTABLE ELECTRODE AND METHOD
FOR FABRICATION
Backaround of the Invention This invention relates to medical electrical 5 stimulation electrodes in general and to defibrillation electrodes in particular.
In the past years, there has been substantial activity toward development of a practical implantable defibrillator. Most proposals involve the use of large 10 surface area implantable electrodes either to be mounted within the heart, on the exterior of the heart or subcutaneously. One common approach of providing a large surface area electrode is to employ an elongated exposed coil of biocompatible metal. In the context of an 15 endocardial lead, this is disclosed in U.S. Patent No.
4,161,952 issued to ~inney. In the context of an epicardial lead, this is disclosed in the context of U.S.
Patent No. ~,187,634 issued to Holleman et al.
In an endocardial lead, an elongated coil serving as 20 the electrode can be mounted around the exterior of an insulative lead body. It is believed desirable in this context to stabilize the electrode coil with respect tG
the lead body, both to provide mechanical integrity and to prevent fibrous ingrowth around the individual coils 25 of the electrode coil. In the above cited Kinney et al patent~ this is accomplished by sliding the coil over the lead body and backfilling the spaces between the electrode coil with a plastic material. The exterior surface of the electrode is then machined to provide a 30 smooth surface. Alternatively, the backfilling may be removed by mean~ of a plasma etch as disclosed in commonly assigned, co-pending application serial no.
07/376,731 by Kiekhafer et al, for a "Method for Fabrication of a Medical Electrode" filed July 7, 1989.
35 In this application, the backfilling is illustrated as extending radially outward between the turns of the coil about one-third to one-half the diameter of the coil -- 203~286 Summary of the Invention The present invention is directed to producing a pacing lead having a structure similar to that of a structure produced by the method disclosed in the above cited Kiekhafer application but without the necessity of the use of a backfilling step which is time consuming and generally involves a large amount of hand labor. The method of the present invention also allows the use of materials which are not readily applied using a backfilling method.
According to a broad aspect of the invention there is provided a method of fabricating a medical electrical electrode comprising the steps of:
sliding an elongated conductive coil over a length of plastic tubing;
inserting a mandrel within said plastic tubing to expand said tubing against said coil and to compress said tubing between said mandrel and said coil; and heating the assembly of said mandrel, said tubing and said coil to cause flow of said plastic tubing between individual turns of said coil.
According to another broad aspect of the invention there is provided a method of fabrication of a medical electrode com-pri8ing the steps of:
sliding a first plastic tube over a second, substan-tially longer plastic tube;
sliding a conductive coil over said first plastic tube;
inserting a mandrel within said second plastic tube to expand said first and second plastic tubes and to compress said ~^ 203~23~
- 2a- 66742-346 first and second plastic tubes between said mandrel and said coil;
and heating the assembly of said mandrel, said first and second tubes and said coil to allow the material of said first tube to flow between individual turns of said coil.
According to another broad aspect of the invention there is provided an implantable electrode lead of the type comprising:
an elongated polyurethane lead body, an elongated space wound coil exposed to the exterior of said polyurethane lead body, said polyurethane lead body extending radially outward between individual turns of said electrode coil; and conductor means for coupling said electrode coil to an implantable medical device.
Brief Description of the Drawings Fig~ 1 illustrates a side cutaway view through a defibrillation electrode manufactured according to the present invention;
Fig. 2 illustrates an initial step of the manufacture of the electrode illustrated in Fig. 1;
Figs. 2, 3 and 4 illustrate various points within the process of assembly of the electrode illustrated in Fig. 1.
Detailed Description of the ~nvention Fig. 1 is a side cutaway view through an endocardial defibrillation electrode according to the present invention. The electrode coil 10 is a space wound, single filar coil of platinum ~--` 2~362~
- 2b- 66742-346 mounted around insulative tubing 12. setween the coil 10 and the tubing 12 and between the individual. turns of the coil 10 is a filler plastic tube 14 which is preferably insulative, but may be conductive plastic in some cases. The filler plastic tube 14 extends radially outward from sheath 12 between the individual turns of coil 10 and typically extends outward between the individual turns of coil 10 to a distance of approximately one-third the diameter of the wire from which coil 10 is fabricated.
2~3~
IMPLANTABLE ELECTRODE AND METHOD
FOR FABRICATION
Backaround of the Invention This invention relates to medical electrical 5 stimulation electrodes in general and to defibrillation electrodes in particular.
In the past years, there has been substantial activity toward development of a practical implantable defibrillator. Most proposals involve the use of large 10 surface area implantable electrodes either to be mounted within the heart, on the exterior of the heart or subcutaneously. One common approach of providing a large surface area electrode is to employ an elongated exposed coil of biocompatible metal. In the context of an 15 endocardial lead, this is disclosed in U.S. Patent No.
4,161,952 issued to ~inney. In the context of an epicardial lead, this is disclosed in the context of U.S.
Patent No. ~,187,634 issued to Holleman et al.
In an endocardial lead, an elongated coil serving as 20 the electrode can be mounted around the exterior of an insulative lead body. It is believed desirable in this context to stabilize the electrode coil with respect tG
the lead body, both to provide mechanical integrity and to prevent fibrous ingrowth around the individual coils 25 of the electrode coil. In the above cited Kinney et al patent~ this is accomplished by sliding the coil over the lead body and backfilling the spaces between the electrode coil with a plastic material. The exterior surface of the electrode is then machined to provide a 30 smooth surface. Alternatively, the backfilling may be removed by mean~ of a plasma etch as disclosed in commonly assigned, co-pending application serial no.
07/376,731 by Kiekhafer et al, for a "Method for Fabrication of a Medical Electrode" filed July 7, 1989.
35 In this application, the backfilling is illustrated as extending radially outward between the turns of the coil about one-third to one-half the diameter of the coil -- 203~286 Summary of the Invention The present invention is directed to producing a pacing lead having a structure similar to that of a structure produced by the method disclosed in the above cited Kiekhafer application but without the necessity of the use of a backfilling step which is time consuming and generally involves a large amount of hand labor. The method of the present invention also allows the use of materials which are not readily applied using a backfilling method.
According to a broad aspect of the invention there is provided a method of fabricating a medical electrical electrode comprising the steps of:
sliding an elongated conductive coil over a length of plastic tubing;
inserting a mandrel within said plastic tubing to expand said tubing against said coil and to compress said tubing between said mandrel and said coil; and heating the assembly of said mandrel, said tubing and said coil to cause flow of said plastic tubing between individual turns of said coil.
According to another broad aspect of the invention there is provided a method of fabrication of a medical electrode com-pri8ing the steps of:
sliding a first plastic tube over a second, substan-tially longer plastic tube;
sliding a conductive coil over said first plastic tube;
inserting a mandrel within said second plastic tube to expand said first and second plastic tubes and to compress said ~^ 203~23~
- 2a- 66742-346 first and second plastic tubes between said mandrel and said coil;
and heating the assembly of said mandrel, said first and second tubes and said coil to allow the material of said first tube to flow between individual turns of said coil.
According to another broad aspect of the invention there is provided an implantable electrode lead of the type comprising:
an elongated polyurethane lead body, an elongated space wound coil exposed to the exterior of said polyurethane lead body, said polyurethane lead body extending radially outward between individual turns of said electrode coil; and conductor means for coupling said electrode coil to an implantable medical device.
Brief Description of the Drawings Fig~ 1 illustrates a side cutaway view through a defibrillation electrode manufactured according to the present invention;
Fig. 2 illustrates an initial step of the manufacture of the electrode illustrated in Fig. 1;
Figs. 2, 3 and 4 illustrate various points within the process of assembly of the electrode illustrated in Fig. 1.
Detailed Description of the ~nvention Fig. 1 is a side cutaway view through an endocardial defibrillation electrode according to the present invention. The electrode coil 10 is a space wound, single filar coil of platinum ~--` 2~362~
- 2b- 66742-346 mounted around insulative tubing 12. setween the coil 10 and the tubing 12 and between the individual. turns of the coil 10 is a filler plastic tube 14 which is preferably insulative, but may be conductive plastic in some cases. The filler plastic tube 14 extends radially outward from sheath 12 between the individual turns of coil 10 and typically extends outward between the individual turns of coil 10 to a distance of approximately one-third the diameter of the wire from which coil 10 is fabricated.
2~3~
Tube 14 and tubing 12 are preferably fabricated of an implantable elastic plastic, preferably a polyurethane. Tube 14 and tubing 12 together form the lead body in the vicinity of electrode coil 10. At its 5 distal end, coil 10 is coupled to a welding sleeve 16 by means of a laser weld at shoulder 18. Similarly at its proximal end, coil 10 is coupled to transition sleeve 20 by means of a laser weld at shoulder 22. Welding sleeve 16 and transitional sleeve 20 are both preferably 10 fabricated of an inert, conductive metal such as platinum to which coil 10 may be readily welded. Transitional sleeve 20 is provided with two perpendicular bores 24 and a circumferential groove 26. A band 28 of insulative material, preferably polyurethane, fills circumferential 15 groove 26, and bores 24 are backfilled with an appropriate adhesive 25 to attach band 28 to tubing 12 assisting in stabilizing the electrode assembly.
Transitional sleeve 20 extends proximally into contact with an elongated coiled conductor (not illustrated) 20 extending to the proximal end of the lead. This conductor serves to couple defibrillation electrode 10 to an implantable defibrillator and may be manufactured using any conventional technique known to the art and coupled to transitional sleeve 20 using any conventional 25 technique known to the art such as crimping, welding, etc. Surrounding the proximal portion of electrode coil 10 iB an outer insulative sheath 30 which extends proxlmally to the proximal end of the lead, covering the coil coupled to transitional sleeve 20.
At the distal end of the lead, an outer insulative ohoath 32 covers the distal end of electrode coil 10 and may extend distally to one or more pacing electrodes coupled to conductors within tubing 12. In the preferred embodiment of the present invention, outer insulative 35 sheaths 30 and 32 are fabricated of a polyurethane of one of the types typically used in conjunction with cardiac 2~62~
Transitional sleeve 20 extends proximally into contact with an elongated coiled conductor (not illustrated) 20 extending to the proximal end of the lead. This conductor serves to couple defibrillation electrode 10 to an implantable defibrillator and may be manufactured using any conventional technique known to the art and coupled to transitional sleeve 20 using any conventional 25 technique known to the art such as crimping, welding, etc. Surrounding the proximal portion of electrode coil 10 iB an outer insulative sheath 30 which extends proxlmally to the proximal end of the lead, covering the coil coupled to transitional sleeve 20.
At the distal end of the lead, an outer insulative ohoath 32 covers the distal end of electrode coil 10 and may extend distally to one or more pacing electrodes coupled to conductors within tubing 12. In the preferred embodiment of the present invention, outer insulative 35 sheaths 30 and 32 are fabricated of a polyurethane of one of the types typically used in conjunction with cardiac 2~62~
pacing leads and are preferably mechanically coupled to the proximal and distal ends of electrode coil 10 by means of an adhesive to further stabilize their locations s Fig 2 illustrates an early step in the manufacture of a defibrillation electrode according to the present invention In this early step, tube 12 is attached to a holding fixture at its proximal end (not illustrated) and filler tube 14 is slid over a ~tylet 40 Stylet 40 is 10 provided with a hooked end 42 passed through the distal end of tubing 12 Preferably tubing 12 display~ an outer diameter somewhat greater than th~ inner diam2ter of filler tube 14 For example, tubing 12 may be 068" x 082"
15 PellethaneO 2363-80A polyurethane, and filler tube 14 may b- a 079"x 095" tubo fabricated of the samo material Filler tube 14 is placed over stylst 40 The hooked end of ~tylet 40 is passed through th~ wall of tubing 12 and used to extend the wall o~ tubing 12 until the 20 diameter of tubing 12 has decreased surficiently to slide filler tube 14 over tubing 12 Preferably, approximately 1 1/2" o~ tubing 12 extends dist~l to filler tube 14 Fr~on may be used to lubricate tubing 12 to facilitate this ~tep, ir n~c-g8ary.
The a~s~mbly Or tubing 12 and filler tube 14 is then allow d to air dry for approxim~tely 1/2 hour, and a ur-th~n- adhe~iv- is then backrilled betweon filler tube 14 and tubing 12 at the proximal and distal ends of ~iller tubing 14 ThiJ a~sembly is allowed to air dry and is placed in an ov~n und~r nigrogen purge Th~ ovan temperature is gradually lncreased to 150C After about ~ive to ten minute~ at 150C, the oven i~ shut of~, and the te~perature allowed to fall This heating step relieves 35 any stresses built up in the tubing The tubing is 2031~6 -5~
removed ~rom the oven and allowed to cool to room temperature.
Fig. 3 illustrates a later step in the assembly process. Prior to this step, the transition sleeve 20 5 has been located adjacent the proximal end of filler tubing 14. Electrode coil 10, preferably has an inner diameter less than the outer diameter of the assembly comprising tubing 12 and filler tubing 14. Coil 10 may be a ~pace wound coil o~ platinum wire and may have an 10 innsr diameter of .092". Coil 10 is placed over stylet 40, and the hooked distal end 42 of stylet 40 is again passed through the dis~al end of tubinq 12. Stylet 40 is used to stretch tubing 12 and filler tube 14, allowing coll 10 to be slld proximally over filler tube 14 until 15 it~ proximal end abuts the circu~erential shoulder 22 of tran~itlon sleevo 20. Tubing 12 and tube 14 are then allowed to relax and re-~xpand into contact with th~
interior o~ electrode coil 10.
Fig. 4 illu~trates a subseguent step in the process 20 of manufacture o~ the electrode an~ shows welding sleeve 16 slipped over tubing 12 in~ido ths distal end o~
electrode coil 10. At this point, the inner diameter of tubing 12 i~ le-~ than its normal inner diameter as tublng 12 and fill0r tube 14 are under radial compression 25 by ol-ctrod- coil 10. Teflon coated mandrel 44 has an outor diameter approximately egual to the inner diameter 9f tublng 12 in it~ relax~d, uncompressed statQ. Mandrel 44 is lubricated with alcohol and slid into the interior o~ tublng 10 compr-~ing tubing 10 and filler tubing 14 30 again~t the interior o~ coil 10. This a~sembly is allowad to air dry and i~ thon placed into an oven gradually h~ated to 150C undor nitrogen purge in order to cause ~low of filler tub~ 14 between tho individual turns of electrode coil 10 to produce the structure 35 illustrated in Flg. 1 abov~. After about five to tsn ~ 2~3~2~6 minutes at 150C, the oven is turned off and the temperature is allowed to gradually fall The assembly is then removed from the oven, allowed to cool for at least 30 minutes, and the mandrel is 5 removed Removal of the mandrel ~aybe facilitated by in~ection of air between the tubing and the mandrel Alternatively, alcohol may be injected batween the tubing and the mandrel to facilitate removal of the mandrql Preferably, the relative sizes of tubing 12, filler 10 tubing 14 and electrode coil lO should be such that after this bakinq step, material from filler tube 14 extends radially within the spaces between the individual turns of electrode coil 10 a distance of approximatsly one-third to one-half of the diameter of the wire from which 15 electrode coil 10 i~ fAbricated ~ he remainder of the assembly of the lead typically follow~ the completion of this ~tep and would include la~r welding o~ the electrodQ 10 and two sleeves 16 and 20, coupling of a conductor coil to thQ proximal end of 20 sleev~ 20 and location of outer insulative sheaths 30 and 32 overlapping proximal and di~tal ends, respectively, of electroda coil 10 as illustrated in Fig 1 Assembly of the r~mainder o~ the lead may also optionally include the provision o~ on~ or mor~ pacing eloctrode8 at the distal 25 end o~ the l~ad and will includo the provision ot an el-c~rical connector a3~embly at the proximal end of the l-ad Addition of th-so as~ambli~s to the lead may be accompli~h~d u~ing any of a numb-r of available prior art ~tructure~ and manu~acturing techniqu~s such as those 30 d~clo~-d in U S Pat-nt No 4,506,680, U S Patent No 4,502,492, U S Pat~nt No 4,258,725, U S Patent No 4,106,512, or U S Patent Application Serial No 07/198,S40, filed May 25, 1988 by Doan et al for a "Connector For Nulticonductor L~adsn, 3S ~owover, it is beli~ved that one of skill in th- art would readily - ~
.
203g28~
appreciate that the present invention can be applied to any elongated medical electrical lead employing any desired combination o~ additional electrodes, sensors and connector~.
As such, the embodiment illustrated above should be considered exemplary rather than limiting with regard to the scop~ of the following claims.
15 PellethaneO 2363-80A polyurethane, and filler tube 14 may b- a 079"x 095" tubo fabricated of the samo material Filler tube 14 is placed over stylst 40 The hooked end of ~tylet 40 is passed through th~ wall of tubing 12 and used to extend the wall o~ tubing 12 until the 20 diameter of tubing 12 has decreased surficiently to slide filler tube 14 over tubing 12 Preferably, approximately 1 1/2" o~ tubing 12 extends dist~l to filler tube 14 Fr~on may be used to lubricate tubing 12 to facilitate this ~tep, ir n~c-g8ary.
The a~s~mbly Or tubing 12 and filler tube 14 is then allow d to air dry for approxim~tely 1/2 hour, and a ur-th~n- adhe~iv- is then backrilled betweon filler tube 14 and tubing 12 at the proximal and distal ends of ~iller tubing 14 ThiJ a~sembly is allowed to air dry and is placed in an ov~n und~r nigrogen purge Th~ ovan temperature is gradually lncreased to 150C After about ~ive to ten minute~ at 150C, the oven i~ shut of~, and the te~perature allowed to fall This heating step relieves 35 any stresses built up in the tubing The tubing is 2031~6 -5~
removed ~rom the oven and allowed to cool to room temperature.
Fig. 3 illustrates a later step in the assembly process. Prior to this step, the transition sleeve 20 5 has been located adjacent the proximal end of filler tubing 14. Electrode coil 10, preferably has an inner diameter less than the outer diameter of the assembly comprising tubing 12 and filler tubing 14. Coil 10 may be a ~pace wound coil o~ platinum wire and may have an 10 innsr diameter of .092". Coil 10 is placed over stylet 40, and the hooked distal end 42 of stylet 40 is again passed through the dis~al end of tubinq 12. Stylet 40 is used to stretch tubing 12 and filler tube 14, allowing coll 10 to be slld proximally over filler tube 14 until 15 it~ proximal end abuts the circu~erential shoulder 22 of tran~itlon sleevo 20. Tubing 12 and tube 14 are then allowed to relax and re-~xpand into contact with th~
interior o~ electrode coil 10.
Fig. 4 illu~trates a subseguent step in the process 20 of manufacture o~ the electrode an~ shows welding sleeve 16 slipped over tubing 12 in~ido ths distal end o~
electrode coil 10. At this point, the inner diameter of tubing 12 i~ le-~ than its normal inner diameter as tublng 12 and fill0r tube 14 are under radial compression 25 by ol-ctrod- coil 10. Teflon coated mandrel 44 has an outor diameter approximately egual to the inner diameter 9f tublng 12 in it~ relax~d, uncompressed statQ. Mandrel 44 is lubricated with alcohol and slid into the interior o~ tublng 10 compr-~ing tubing 10 and filler tubing 14 30 again~t the interior o~ coil 10. This a~sembly is allowad to air dry and i~ thon placed into an oven gradually h~ated to 150C undor nitrogen purge in order to cause ~low of filler tub~ 14 between tho individual turns of electrode coil 10 to produce the structure 35 illustrated in Flg. 1 abov~. After about five to tsn ~ 2~3~2~6 minutes at 150C, the oven is turned off and the temperature is allowed to gradually fall The assembly is then removed from the oven, allowed to cool for at least 30 minutes, and the mandrel is 5 removed Removal of the mandrel ~aybe facilitated by in~ection of air between the tubing and the mandrel Alternatively, alcohol may be injected batween the tubing and the mandrel to facilitate removal of the mandrql Preferably, the relative sizes of tubing 12, filler 10 tubing 14 and electrode coil lO should be such that after this bakinq step, material from filler tube 14 extends radially within the spaces between the individual turns of electrode coil 10 a distance of approximatsly one-third to one-half of the diameter of the wire from which 15 electrode coil 10 i~ fAbricated ~ he remainder of the assembly of the lead typically follow~ the completion of this ~tep and would include la~r welding o~ the electrodQ 10 and two sleeves 16 and 20, coupling of a conductor coil to thQ proximal end of 20 sleev~ 20 and location of outer insulative sheaths 30 and 32 overlapping proximal and di~tal ends, respectively, of electroda coil 10 as illustrated in Fig 1 Assembly of the r~mainder o~ the lead may also optionally include the provision o~ on~ or mor~ pacing eloctrode8 at the distal 25 end o~ the l~ad and will includo the provision ot an el-c~rical connector a3~embly at the proximal end of the l-ad Addition of th-so as~ambli~s to the lead may be accompli~h~d u~ing any of a numb-r of available prior art ~tructure~ and manu~acturing techniqu~s such as those 30 d~clo~-d in U S Pat-nt No 4,506,680, U S Patent No 4,502,492, U S Pat~nt No 4,258,725, U S Patent No 4,106,512, or U S Patent Application Serial No 07/198,S40, filed May 25, 1988 by Doan et al for a "Connector For Nulticonductor L~adsn, 3S ~owover, it is beli~ved that one of skill in th- art would readily - ~
.
203g28~
appreciate that the present invention can be applied to any elongated medical electrical lead employing any desired combination o~ additional electrodes, sensors and connector~.
As such, the embodiment illustrated above should be considered exemplary rather than limiting with regard to the scop~ of the following claims.
Claims (8)
1 A method of fabricating a medical electrical electrode comprising the steps of sliding an elongated conductive coil over a length of plastic tubing;
inserting a mandrel within said plastic tubing to expand said tubing against said coil and to compress said tubing between said mandrel and said coil; and heating the assembly of said mandrel, said tubing and said coil to cause flow of said plastic tubing between individual turns of said coil
inserting a mandrel within said plastic tubing to expand said tubing against said coil and to compress said tubing between said mandrel and said coil; and heating the assembly of said mandrel, said tubing and said coil to cause flow of said plastic tubing between individual turns of said coil
2 A method of fabrication according to claim 1, wherein said elongated conductive coil has an inner diameter and wherein said plastic tubing comprises an elastic plastic and has an outer diameter greater than the inner diameter of said conductor coil, and wherein said method further comprises the step of stretching said plastic tubing to reduce the diameter of said tubing prior to sliding said conductive coil over said plastic tubing
3 A method according to claim 1 wherein said plastic tubing comprises a first elongated plastic tube, surrounded by a second plastic tube having substantially shorter length than said first plastic tube, and adhered to said first plastic tube, and wherein said step of sliding said coil over said plastic tubing comprises sliding said coil over said second plastic tube
4 A method of fabrication of a medical electrode comprising the step of sliding a first plastic tubs over a second, substantially longer plastic tube;
sliding a conductive coil over said first plastic tube;
inserting a mandrel within said second plastic tube to expand said first and second plastic tubes and to comprise said first and second plastic tubes between said mandrel and said coil; and heating the assembly of said mandrel, said first and second tubes and said coil to allow the material of said first tube to flow between individual turns of said coil
sliding a conductive coil over said first plastic tube;
inserting a mandrel within said second plastic tube to expand said first and second plastic tubes and to comprise said first and second plastic tubes between said mandrel and said coil; and heating the assembly of said mandrel, said first and second tubes and said coil to allow the material of said first tube to flow between individual turns of said coil
5. A method according to claim 4 wherein said first and second plastic tubes comprise elastic plastic tubes, wherein said first plastic tube has an inner diameter and wherein said second plastic tube has an outer diameter greater than the inner diameter of said first plastic tube, and wherein said method comprises the additional step of stretching said second plastic tube to reduce its outer diameter prior to said step of sliding said first plastic tuba over said second plastic tube
6. A method according to claim 4 or claim 5 wherein said conductive coil has an inner diameter and wherein said first and second plastic tubes are elastic plastic tubes, said first plastic tube having an outer diameter, in its relaxed states, greater than the inner diameter of said conductive coil, and wherein said method comprises the further step of stretching said first and second plastic tubes to reduce the outer diameter of said first plastic tub prior to said step Or sliding aid conductive coil over said first plastic tube
7. An implantable electrod lead of the type comprising:
an elongated polyurethane lead body, an elongated space wound coil exposed to the exterior of said polyurothane lead body, said polyurethane lead body extending radially outward between individual turns of said electrode coil; and conductor means for coupling said electrode coil to an implantable medical device
an elongated polyurethane lead body, an elongated space wound coil exposed to the exterior of said polyurothane lead body, said polyurethane lead body extending radially outward between individual turns of said electrode coil; and conductor means for coupling said electrode coil to an implantable medical device
8. A lead according to claim 7 wherein said electrode coil is fabricated from a conductive wire and wherein said polyurethane lead body extends radially outward between individual turns of said electrode coil to a depth of approximately one-third to one-half of said diameter of said wire.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/479,928 | 1990-02-14 | ||
| US07/479,928 US5042143A (en) | 1990-02-14 | 1990-02-14 | Method for fabrication of implantable electrode |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2036286A1 true CA2036286A1 (en) | 1991-08-15 |
Family
ID=23906004
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002036286A Abandoned CA2036286A1 (en) | 1990-02-14 | 1991-02-13 | Implantable electrode and method for fabrication |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US5042143A (en) |
| EP (1) | EP0442444A3 (en) |
| JP (1) | JPH05103787A (en) |
| AU (1) | AU628771B2 (en) |
| CA (1) | CA2036286A1 (en) |
Families Citing this family (44)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5246014A (en) * | 1991-11-08 | 1993-09-21 | Medtronic, Inc. | Implantable lead system |
| US5292338A (en) * | 1992-07-30 | 1994-03-08 | Medtronic, Inc. | Atrial defibrillator employing transvenous and subcutaneous electrodes and method of use |
| US5403351A (en) * | 1993-01-11 | 1995-04-04 | Saksena; Sanjeev | Method of transvenous defibrillation/cardioversion employing an endocardial lead system |
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| US3541682A (en) * | 1967-08-07 | 1970-11-24 | Smith Paul Inc | Process for manufacturing coil components and transformers |
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| US4592372A (en) * | 1984-05-22 | 1986-06-03 | Cordis Corporation | Pacing/sensing electrode sleeve and method of forming same |
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| US4934049A (en) * | 1989-07-07 | 1990-06-19 | Medtronic, Inc. | Method for fabrication of a medical electrode |
-
1990
- 1990-02-14 US US07/479,928 patent/US5042143A/en not_active Expired - Lifetime
-
1991
- 1991-02-04 AU AU70231/91A patent/AU628771B2/en not_active Ceased
- 1991-02-12 EP EP19910101952 patent/EP0442444A3/en not_active Ceased
- 1991-02-13 CA CA002036286A patent/CA2036286A1/en not_active Abandoned
- 1991-02-14 JP JP3040831A patent/JPH05103787A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| AU628771B2 (en) | 1992-09-17 |
| JPH05103787A (en) | 1993-04-27 |
| AU7023191A (en) | 1991-08-15 |
| EP0442444A3 (en) | 1992-04-01 |
| US5042143A (en) | 1991-08-27 |
| EP0442444A2 (en) | 1991-08-21 |
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Legal Events
| Date | Code | Title | Description |
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| EEER | Examination request | ||
| FZDE | Discontinued |