WO2005032649A1 - Drug-eluting electrode - Google Patents
Drug-eluting electrode Download PDFInfo
- Publication number
- WO2005032649A1 WO2005032649A1 PCT/US2004/032064 US2004032064W WO2005032649A1 WO 2005032649 A1 WO2005032649 A1 WO 2005032649A1 US 2004032064 W US2004032064 W US 2004032064W WO 2005032649 A1 WO2005032649 A1 WO 2005032649A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- agent
- layer
- electrode
- pharmacological
- pharmacological agent
- Prior art date
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
- A61N1/0565—Electrode heads
- A61N1/0568—Electrode heads with drug delivery
Definitions
- the present invention relates generally to leads for conducting electrical signals to and from the heart. More particularly, it pertains to electrodes for leads.
- Electrodes implanted in the body for electrical cardioversion or pacing of the heart are generally known in the art.
- electrically transmissive leads may be implanted in or about the heart to reverse (i.e., defibrillate or cardiovert) certain life threatening arrhythmias or to stimulate contraction (pacing) of the heart.
- Electrical energy is applied to the heart via one or more electrodes on the leads to return the heart to normal rhythm.
- Leads have also been used to sense conditions, materials or events (generally referred to as "sense” or “sensing") in the body, such as in the atrium or ventricle of the heart and to deliver pacing pulses to the atrium or ventricle.
- Tachy leads generally can at least sense, pace, and deliver def ⁇ brillation shocks. Brady leads can at least perform the combination functions of pacing and sensing the heart.
- One of the available functions of the pacemaker or the automatic implantable cardioverter defibrillator (AICD) is to receive signals from a lead and interpret signals. In response to these signals, the pacemaker can pace or not pace.
- the AICD can pace or not pace, and shock or not shock.
- Some leads include drug eluting structures proximate the electrodes to deliver therapeutic drugs near the electrode/tissue interface. However, current leads utilize either a drug plug or a drug collar to store and control the release of the drugs. However, as leads become smaller, the size of the drug plugs and collars becomes incompatible with the lead size.
- a lead includes a lead body and an electrical conductor.
- An electrode is coupled to the electrical conductor.
- the electrode includes a coating on at least a portion of the electrode, the coating including two or more layers, with a first layer adjacent the surface of the electrode comprising an insulative material and a second layer adjacent the first layer comprising at least one pharmacological agent.
- Figure 1 shows a lead and pulse generator in accordance with one embodiment.
- Figure 2 shows an electrode in accordance with one embodiment.
- Figure 3 shows a helix in accordance with one embodiment.
- Figure 4 shows a cross section view of the helix of Figure 3.
- Figure 1 shows a lead 10 coupled to a pulse generator 15.
- Lead 10 comprises a lead body 11, an elongate conductor 13 contained within the lead body, and a lead tip 20 with an electrode 24 at the lead tip 20.
- a brady lead body is shown, although some embodiments of the present system can be incorporated with other leads, such as tachy leads.
- the lead body 11 consists of electrical conductors 13 which are covered by a biocompatible insulating material 22. Polymers, such as silicone rubber, fluorinated resins, polyacrylates, polyamides ceramic or composite materials or other insulating material can be used for covering the lead body 11.
- Figure 2 shows a side view of electrode 24, in according with one embodiment.
- Electrode 24 includes a base material body 26 which can include titanium, platinum, and platinum iridium, among other material.
- a coating 28 covers at least a portion of the outer surface of the electrode.
- coating 28 includes one or more pharmaceutical agents to provide therapy to the tissue adjacent the electrode when the electrode is implanted.
- Electrode 24 is designed to be in contact with endocardium or myocardium tissue and to deliver both pacing therapy and therapeutic agents to the site of trauma.
- the therapeutic agents either a homogeneous drug or a combination of several drugs, are fixated to the surface of the electrode. Applying coating 28 directly to the electrode allows for the removal of a drug collar from the lead. This saves significant space on the tip configuration. Additionally, by placing the therapeutic agent directly on the electrode surface, there is an immediate proximity to the site of trauma. The therapeutic agent will be more efficient at reaching the wound.
- FIG. 3 shows a helix 30 coupled to lead 11, in accordance with one embodiment.
- Helix 30 includes a body 32 having a coating 34 covering at least a portion of the helix surface. Coating 34 is similar to coating 28 described above, and the above discussion is incorporated herein.
- Helix 30 provides a technique for securing an electrode assembly to the heart.
- helix 30 can be coupled to conductor 13 ( Figure 1) and can be formed of an electrically conductive material offering low electrical resistance and is also resistant to corrosion by body fluids.
- a biocompatible metal such as titanium, platinum, or platinum-iridium alloy are examples of suitable materials.
- the helix 100 can be electrically inactive or insulated.
- helix 30 can be constructed of a rigid, corrosion resistant, non-electrically-conductive material (e.g., a ceramic).
- helix 30 can extend through a mesh electrode 36 at the distal end of lead 11.
- helix 30 can be retractable, as known in the art.
- Figure 4 shows a cross section of coating 34 of helix 30 of Figure 3. Coating 34 is similar to coating 28 and the following discussion applies to coating 28 of electrode 24 also.
- the drug-coated electrode 30 is used for delivering therapeutic agents to the site of contact with the endocardium.
- coating 28 includes from the surface of helix body 32 outward: a first layer 40, such as a polymer primer layer that also functions to increase electrode impedance, a second layer 42 comprising a therapeutic layer which can include a pharmacological agent 44 and polymer matrix 46, a third layer 48 including a release-control layer of polymer, and a fourth layer 50 including a layer of pure drug. Characteristics of the coatings such as surface area of coverage, layer thickness, and mass ratio can be varied. In some embodiments, one or more of the layers described above can be omitted.
- first layer 40 can include a polymeric base coat on the electrode surface.
- the polymeric base coat can include an ethyl ene vinyl alcohol.
- the material used for the coating is biocompatible and, in one option, non- thrombogenic. In other embodiments, materials such as Parylene TM, polyurethanes, polyacrylates (including polymethacrylates), polyesters, polyamides, polyethers, polysiloxanes, polyepoxide resins and the like can be used.
- the coating of first layer 40 is at least one micron up to about 100 microns in thickness. In some embodiments, the coating is between 1 and 30 microns, between 1.5 and 20 microns, between 1.5 and 15 microns, or between 2 and 10 microns.
- First layer 40 acts as a primer layer for attaching second layer 42 and also provides increased impedance by insulating at least a portion of the electrode surface.
- the insulated portion can cover a majority of the electrically active surface of the fixation helix, leaving a relatively small uninsulated region of the fixation helix.
- This approach functionally increases the impedance of the electrode to reduce energy dissipation in pulsing functions, such as pacing functions.
- Other varying embodiments include, but are not limited to, a portion which is approximately or substantially equal to half of the fixation helix, and a portion which is approximately or substantially equal to a minority of the fixation helix. Such embodiments provide different amounts of uninsulated region and different amounts of impedance.
- second layer 42 includes a polymer and drug matrix to deliver and gradually release a therapeutic or pharmacological agent 44 intended to prevent the formation of scar tissue around the electrode.
- the pharmacological agent may consist of either one drug or a combination of drugs depending on the desired affect. Providing several different drugs to the area of trauma will allow for more complete treatment of cellular responses to the electrode.
- second layer 42 can comprise a matrix comprising a polymer 46, such as one of the polymers discussed above for layer 40, and at least one pharmacological agent 44, wherein the second layer at least partially covers the polymeric base coat 40.
- the pharmacological agent 44 can include an anti-arrhythmic agent, an angiogenic growth factor, an anti-inflammatory agent, an anti-proliferative agent, an anti-coagulant, an antibiotic, or a combination thereof.
- the agent 44 agent is dexamethasone, clobetasol, beclomethasone, paclitaxel, actinomycin-D, everolimus, or a pharmaceutically acceptable salt thereof.
- the ratio of pharmacological agent to polymer in the second layers can be 30% to 40% by weight in some embodiments. Other embodiments have a ratio of up to 44% by weight, up to 50% by weight, and up to 60% by weight. Some embodiments can be less than 30% or greater than 60%.
- third layer 48 includes a porous barrier including a polymeric coating having a porosity to regulate the release of the pharmacological agent 44 from the matrix.
- the polymers discussed above can be used for third layer 48.
- the third layer has a thickness of about 1 or 2 microns.
- the third layer 48 is coated multiple times to provide the desired porosity.
- the outer, fourth layer 50, a drug-only coat functions to provide immediate therapeutic treatment to the site of electrode contact and tissue trauma. Single or multiple drug configurations may be used in the fourth coating layer 50.
- the fourth coating layer 50 composed strictly of drug, will be exposed to tissue upon implant and will provide immediate therapy to the site of trauma while the second layer 42 will be responsible for a more regulated, chronic release of drug therapy. This combination of both quick and chronic release will better prevent the formation of scar tissue. This in turn will lower acute and chronic voltage thresholds.
- fourth layer 50 can include an anti -arrhythmic agent, an angiogenic growth factor, an anti-inflammatory agent, an anti-proliferative agent, an anti-coagulant, an antibiotic, or a combination thereof.
- the pharmaceutical agent of the fourth layer can include dexamethasone, clobetasol, beclomethasone, paclitaxel, actinomycin-D, everolimus, or a pharmaceutically acceptable salt thereof.
- One technique to form the electrode described above is coating or spraying the tip with a first layer of a polymeric base coat and then coating the helical tip with a second layer, wherein the second layer comprises a polymer and at least one pharmacological agent, and at least partially coats the first layer.
- the coatings of any of the layers can be applied by any convenient method, including, but not limited to coating (e.g., dip coating), printing, spraying, brush application, resist application and removal and the like.
- the above-described embodiments allow for elimination of large and cumbersome drug collars, while allowing for direct application of drug at the site of the trauma, providing immediate delivery at the site of the trauma.
- the additional layers assist in providing a more regulated, chronic release of the drug.
- the combination of both direct and quick release with a chronic release will better prevent the formation of scar tissue. This will lower acute and chronic voltage thresholds.
- Providing the drug on the electrode further prevents the washing away of the drug and maximizes the effectiveness of drug reaching the tissue.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT04785284T ATE532556T1 (en) | 2003-09-30 | 2004-09-30 | MEDICINAL ELUTION ELECTRODE |
JP2006534073A JP4597133B2 (en) | 2003-09-30 | 2004-09-30 | Device equipped with drug eluting electrode and method of manufacturing the device |
EP04785284A EP1670543B1 (en) | 2003-09-30 | 2004-09-30 | Drug-eluting electrode |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/675,920 | 2003-09-30 | ||
US10/675,920 US7953499B2 (en) | 2003-09-30 | 2003-09-30 | Drug-eluting electrode |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2005032649A1 true WO2005032649A1 (en) | 2005-04-14 |
WO2005032649A8 WO2005032649A8 (en) | 2006-05-26 |
Family
ID=34377311
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2004/032064 WO2005032649A1 (en) | 2003-09-30 | 2004-09-30 | Drug-eluting electrode |
Country Status (5)
Country | Link |
---|---|
US (1) | US7953499B2 (en) |
EP (1) | EP1670543B1 (en) |
JP (1) | JP4597133B2 (en) |
AT (1) | ATE532556T1 (en) |
WO (1) | WO2005032649A1 (en) |
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2003
- 2003-09-30 US US10/675,920 patent/US7953499B2/en not_active Expired - Fee Related
-
2004
- 2004-09-30 JP JP2006534073A patent/JP4597133B2/en not_active Expired - Fee Related
- 2004-09-30 AT AT04785284T patent/ATE532556T1/en active
- 2004-09-30 EP EP04785284A patent/EP1670543B1/en not_active Not-in-force
- 2004-09-30 WO PCT/US2004/032064 patent/WO2005032649A1/en active Application Filing
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EP0791372A1 (en) * | 1996-02-21 | 1997-08-27 | Medtronic, Inc. | Medical electrical lead |
US6263249B1 (en) * | 1999-02-26 | 2001-07-17 | Medtronic, Inc. | Medical electrical lead having controlled texture surface and method of making same |
US20020077685A1 (en) * | 2000-12-20 | 2002-06-20 | Medtronic, Inc. | Medical electrical lead and method of use |
Also Published As
Publication number | Publication date |
---|---|
US7953499B2 (en) | 2011-05-31 |
EP1670543A1 (en) | 2006-06-21 |
EP1670543B1 (en) | 2011-11-09 |
WO2005032649A8 (en) | 2006-05-26 |
US20050070985A1 (en) | 2005-03-31 |
JP2007507303A (en) | 2007-03-29 |
ATE532556T1 (en) | 2011-11-15 |
JP4597133B2 (en) | 2010-12-15 |
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