Classifications

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  • A61B17/22004—Implements for squeezing-off ulcers or the like on inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; for invasive removal or destruction of calculus using mechanical vibrations; for removing obstructions in blood vessels, not otherwise provided for using mechanical vibrations, e.g. ultrasonic shock waves
  • A61B17/22012—Implements for squeezing-off ulcers or the like on inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; for invasive removal or destruction of calculus using mechanical vibrations; for removing obstructions in blood vessels, not otherwise provided for using mechanical vibrations, e.g. ultrasonic shock waves in direct contact with, or very close to, the obstruction or concrement
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  • A61B17/22004—Implements for squeezing-off ulcers or the like on inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; for invasive removal or destruction of calculus using mechanical vibrations; for removing obstructions in blood vessels, not otherwise provided for using mechanical vibrations, e.g. ultrasonic shock waves
  • A61B17/22012—Implements for squeezing-off ulcers or the like on inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; for invasive removal or destruction of calculus using mechanical vibrations; for removing obstructions in blood vessels, not otherwise provided for using mechanical vibrations, e.g. ultrasonic shock waves in direct contact with, or very close to, the obstruction or concrement
  • A61B17/2202—Implements for squeezing-off ulcers or the like on inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; for invasive removal or destruction of calculus using mechanical vibrations; for removing obstructions in blood vessels, not otherwise provided for using mechanical vibrations, e.g. ultrasonic shock waves in direct contact with, or very close to, the obstruction or concrement the ultrasound transducer being inside patient's body at the distal end of the catheter
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  • A61F2/02—Prostheses implantable into the body
  • A61F2/24—Heart valves ; Vascular valves, e.g. venous valves; Heart implants, e.g. passive devices for improving the function of the native valve or the heart muscle; Transmyocardial revascularisation [TMR] devices; Valves implantable in the body
  • A61F2/2442—Annuloplasty rings or inserts for correcting the valve shape; Implants for improving the function of a native heart valve
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  • A61B2017/22038—Implements for squeezing-off ulcers or the like on inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; for invasive removal or destruction of calculus using mechanical vibrations; for removing obstructions in blood vessels, not otherwise provided for with a guide wire
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  • A61B2017/22051—Implements for squeezing-off ulcers or the like on inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; for invasive removal or destruction of calculus using mechanical vibrations; for removing obstructions in blood vessels, not otherwise provided for with an inflatable part, e.g. balloon, for positioning, blocking, or immobilisation
  • A61B2017/22061—Implements for squeezing-off ulcers or the like on inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; for invasive removal or destruction of calculus using mechanical vibrations; for removing obstructions in blood vessels, not otherwise provided for with an inflatable part, e.g. balloon, for positioning, blocking, or immobilisation for spreading elements apart
• • A—HUMAN NECESSITIES
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  • A61B2017/22051—Implements for squeezing-off ulcers or the like on inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; for invasive removal or destruction of calculus using mechanical vibrations; for removing obstructions in blood vessels, not otherwise provided for with an inflatable part, e.g. balloon, for positioning, blocking, or immobilisation
  • A61B2017/22065—Functions of balloons
  • A61B2017/22069—Immobilising; Stabilising
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  • A61B2017/22079—Implements for squeezing-off ulcers or the like on inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; for invasive removal or destruction of calculus using mechanical vibrations; for removing obstructions in blood vessels, not otherwise provided for with suction of debris
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  • A61B2017/22098—Decalcification of valves
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  • A61B17/221—Gripping devices in the form of loops or baskets for gripping calculi or similar types of obstructions
  • A61B2017/2215—Gripping devices in the form of loops or baskets for gripping calculi or similar types of obstructions having an open distal end
• • A—HUMAN NECESSITIES
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  • A61B2018/00011—Cooling or heating of the probe or tissue immediately surrounding the probe with fluids
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  • A61B2018/0231—Characteristics of handpieces or probes
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  • A61M25/10—Balloon catheters
  • A61M2025/1043—Balloon catheters with special features or adapted for special applications
  • A61M2025/105—Balloon catheters with special features or adapted for special applications having a balloon suitable for drug delivery, e.g. by using holes for delivery, drug coating or membranes
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  • A61N2007/0039—Ultrasound therapy using microbubbles

Definitions

• Aortic valve stenosis is a common cardiac disease resulting in approximately 65,000 aortic valve replacement surgeries in the United States annually. Aortic valve stenosis can occur via several etiologies including rheumatic disease, congenital and degenerative calcific stenosis. In developing countries, rheumatic fever results in thickening and progressive immobility of the valve tissues. Calcific disease accounts for almost all of the cases of aortic stenosis in the United States and in developed countries where rheumatic disease is rare.
• vavuloplasty balloon designs and other approaches, including energy based therapies have been disclosed in United States Patents 3,667,474 Lapkin, 4,484,579 Meno, 4,787,388 Hoffman, 4,777,951 Cribier, 4,878,495 and 4,796,629 to Grayzel, 4,819,751 Shimada, 4,986,830 Owens, 5,443,446 and 5,295,958 to Schturman, 5,904,679 Clayman, 5,352,199 and 6,746,463 to Tower, the disclosures of which are expressly incorporated herein by reference.
• anti-calcification drugs including ACE inhibitors, statins, and angiotensins, specifically angiotensin JJ, as detailed in United States Patent Application Publication 2004/0057955, the disclosure of which is expressly incorporated herein by reference.
• the present invention provides various devices and methods that create more effective treatments for aortic stenosis and prevent or reduce the incidence and/or severity of aortic restenosis.
• the present inventions provides methods and devices for decalcification or debridement of aortic stenosis, either as a stand alone therapy or in conjunction with conventional techniques, such as traditional valvuloplasty, stenting, valve repair, and percutaneous or surgical valve replacement.
• the present invention relates to the repair of aortic and other cardiac valves, and more particularly devices and methods for calcium removal and anti-restenosis systems for achieving such repair.
• the invention can take a number of different forms, including apparatus, acute interventions performed at the time of the aortic repair or valvuloplasty, or temporary or permanent implant, and the like.
• the methods and devices of the reduce or remove calcifications on or around the valve through application or removal of energy to disrupt the calcifications.
• the present invention may apply ultrasound energy, RF energy, a mechanical energy, or the like, to the valve to remove the calcification from the valve.
• it may be desirable to instead remove energy (e.g. cryogenically cooling) from the calcification to enhance the removal of the calcification from the valve.
• it will be desirable to create an embolic containment region over a localized calcific site on or near the cardiac valve. Such containment may be achieved by creating a structure about the localized site and/or by actively aspirating embolic particles from the site as they are created. Suitable structures include filters, baskets, balloons, housings and the like.
• treatment catheters are provided to deliver a working element to the vicinity of the diseased valve.
• Working element can include an ultrasonic element, or any other delivery mechanism or element that is capable of disrupting, e.g., breaking up or obliterating calcific deposits in and around the cardiac valve.
• Such devices may be steerable or otherwise positionable to allow the user to direct the distal end of the catheter grossly for initial placement through the patient's arteries to the valve, and then precisely adjust placement prior to and/or during treatment.
• the present invention provides a treatment catheter that comprises a mechanical element that can disrupt, e.g., mechanically break up, obliterate, and remove the calcific deposits in and around the aortic valve.
• a mechanical element that can disrupt, e.g., mechanically break up, obliterate, and remove the calcific deposits in and around the aortic valve.
• the catheter comprising the mechanical element may be steerable or otherwise articulable to allow the user to direct the distal end of the catheter grossly for initial placement, and then fine tune placement during treatment.
• systems including a guide catheter may also be employed to position the treatment catheter at the site of the disease to be treated, either as a separate catheter or as part of the treatment device.
• a main guide catheter may be used to center a secondary positioning catheter that contains the treatment catheter over the aortic valve.
• the treatment catheter may then be further articulated to provide even further directionality to the working end.
• Various other apparatus and methods may be employed for positioning and stabilizing the treatment catheter, including shaped balloons, baskets or filters and methods of pacing the heart.
• methods may be used to disrupt the calcified sites and trap and evacuate emboli and other debris from the treatment site, using filters located on the treatment catheter, suction housings located on the treatment catheter, perfusion balloons linked with aspiration devices, separate suction catheters, separate filter devices either at the treatment site or downstream from the treatment site, and/or external filter and perfusion systems.
• Certain filter embodiments may be shaped to allow the treatment catheter to access the location to be treated, while still allowing flow through the valve (e.g. treating one leaflet at a time).
• methods for treating cardiac valves comprise creating an emboli containment region over a calcific site and delivering energy (including cryotherapy) to disrupt said site and potentially create emboli which are contained in the containment region.
• the containment regions will typically be localized directly over a target site, usually having a limited size so that the associated aorta or other blood vessel is not blocked or occluded.
• the containment region may be created using a barrier, such as a filter structure, basket, or balloon over the calcified site. Alternatively or additionally, the containment region may be created by localized aspiration to remove substantially all emboli as they are formed.
• the energy applied may be ultrasound, radiofrequency, microwave, mechanical, cryogenic, or any other type of energy capable of disrupting valve calcifications.
• the methods may virtually disintegrate the calcification through the use a media that contains microspheres or microbubbles, such as OptisonTM sold by GE Healthcare (www.amershamhealth-us.com/optison/). Delivery of an ultrasound energy (or other form of energy, for example, laser, RF, thermal, energy) to the media may cause the microspheres to rupture, which causes a release of energy toward the valve, which may help remove the calcification around and on the valve. Bioeffects Caused by Changes in Ascoustic Cavitation Bubble Density and Cell Concentration: A Unifed Explanation Based on Cell-to-Bubble Ratio and Blast Radius, Guzman, et al. Ultrasound in Med. & Biol., Vol. 29, No. 8, pp. 1211-1222 (2003).
• Certain imaging and other monitoring modalities may be employed prior to, during or after the procedure of the present invention, utilizing a variety of techniques, such as intracardiac echocardiography (ICE), transesophageal echocardiography (TEE), fluoroscopy, intravascular ultrasound, angioscopy or systems which use infrared technology to "see through blood", such as that under development by Cardio-Optics, Inc.
• ICE intracardiac echocardiography
• TEE transesophageal echocardiography
• fluoroscopy fluoroscopy
• intravascular ultrasound such as that under development by Cardio-Optics, Inc.
• Various energy sources may be utilized to effect the treatment of the present invention, including RF, ultrasonic energy in various therapeutic ranges, and mechanical (non-ultrasound) energy.
• the distal tips of the RF, ultrasonic treatment catheters, and mechanical treatment catheters of the present invention may have a variety of distal tip configurations, and be may be used in a variety of treatment patterns, and to target specific locations within the valve.
• intravascular implants are contemplated by the present invention, including those placed within the valve annulus, supra annular, sub annular, or a combination thereof to assist in maintaining a functional valve orifice.
• Such implants may incorporate various pharamacological agents to increase efficacy by reducing restenosis, and otherwise aiding valve function.
• Implants may be formed of various metals, biodegradable materials, or combinations thereof.
• These devices may all be introduced via either the retrograde approach, from the femoral artery, into the aorta and across the valve from the ascending aorta, or through the antegrade approach - transeptal, across the mitral valve, through the left ventricle and across the aortic valve.
• the present invention provides an anti-restenosis system for aortic valve repair.
• Acute interventions are performed at the time of the aortic repair or valvuloplasty and may take the form of a temporary or permanent implant.
• implant devices may all be introduced via either the retrograde approach, from the femoral artery, into the aorta and across the valve from the ascending aorta, or through the antegrade approach — trans-septal, across the mitral valve, through the left ventricle and across the aortic valve, and will provide for delivery of anti-restenosis agents or energy to inhibit and/or repair valve restenosis.
• Treatment catheters 10 typically comprise an elongate catheter body 12 that comprises a proximal end 14, a distal end 16, and one or more lumens 18, 20 (Fig. 2) within the catheter body.
• the distal end 16 may optionally comprise a suction housing 22 (Figs. 4 and 5) that extends distally from the distal end of the catheter body 12 for isolating the leaflet during treatment as well as providing a debris evacuation path during treatment and protecting the vasculature from adverse embolic events.
• An energy transmission element 24 (e.g., a drive shaft, wire leads, or a waveguide-ultrasonic transmission element, or the like) may be positioned in one of the lumens in the elongate body 12 and will typically extend from the proximal end to the distal end of the catheter body.
• a handle 26 is coupled to the proximal end 14 of the elongate catheter body 12.
• a generator e.g., RF generator, ultrasound generator, motor, optical energy source, etc.
• the distal working element 28 may be coupled to the distal end of the energy transmission element 24 to facilitate delivery of the energy to the calcification on the aortic valve.
• the treatment catheters 10 of the present invention are configured to be introduced to the target area "over the wire.”
• the treatment catheters may be positioned adjacent the aortic valve through a guide catheter or sheath.
• the treatment catheters of the present invention may comprise a central guidewire lumen 20 for receiving a guidewire GW (Fig. 2).
• the guidewire lumen 20 of the treatment catheters of the present invention may also be used for irrigating or aspirating the target area.
• the handle may comprise one or more ports so as to allow for irrigation of the target leaflet and/or aspiration of the target area.
• An irrigation source and/or an aspiration source may be coupled to the port(s), and the target area may be aspirated through one of the lumen of the catheter and/or irrigated through one of the lumens of the catheter.
• one of the irrigation source and aspiration source may be coupled to the central guidewire lumen (central lumen) and the other of the aspiration source and the irrigation source may be coupled to the lumen that is coaxial to the guidewire lumen. In some embodiments, however, there will be no inner guidewire lumen and the guidewire will simply extend through the ultrasound waveguide and the rotatable drive shaft, as shown in Figs. 3, 4 and 6.
• the treatment catheters 10 of the present invention may comprise a suction housing positioned at the distal end of the catheter body having an expanded configuration and a retracted configuration and configured to conform to the valve leaflet to be treated. While the suction housing 22 may be fixedly attached at the distal end, in preferred embodiments, the suction housing is movable between a retracted configuration (Fig 3) and an expanded configuration (Fig. 4 and 5). A separate sheath may also be retracted to expose the suction housing and advanced to fold the housing.
• the suction housing may be made from silicone or urethane and may be reinforced with an internal frame or mesh reinforcement to provide structural support or to enhance placement of the housing on a specified area of the valve leaflet. The housing may further act as an embolic filter as detailed later in this specification.
• the energy transmission element 24 is advanced beyond the distal end of the catheter body 12 and into the suction housing 22.
• the guidewire GW is positioned through an opening in the distal tip.
• the guidewire GW is withdrawn and the distal working element 28 is ready for use to treat the calcification.
• the suction housing 22 is shaped to substantially conform to the shape of a bicuspid valve leaflet.
• the suction housing may be better configured to isolate the target leaflet.
• the suction housing may be shaped to substantially conform to a tricuspid valve (Fig. 7 and 8), etc.
• the depth of the suction housing may take many forms such that it is compatible with the valve to be treated.
• the suction housing 22 may be shallow (Fig. 9) or deep (Fig. 10).
• the depth on the cup can reduce or eliminate obstructing the coronary ostia if one of the leaflets under treatment is a coronary leaflet.
• the suction cups/housings may also have rigid or semi-rigid members around the circumference or part of the circumference of the housing to preferentially align the cup on certain valve features, such as the annulus.
• the suction cup housings have a depth range of
• the cup or housing may have fingers 30 or longitudinal stabilizing elements 32 to assist in placing the housing against the valve as shown in Figs. 11, 12, and 13.
• Such stabilizing elements may also be in the form of pleats, rings or hemispherical elements, or other reinforcements to assist the device to seat within the annulus of the valve or against the leaflet.
• Such reinforcements or stabilizing elements may be formed of stainless steel, NiTi (superelastic or shape memory treated), Elgiloy®, cobalt chromium, various polymers, or may be in the form of an inflatable ringed cup.
• the cup or housing of the present invention is intended to function to provide sufficient approximation with the treatment area so as to stabilize or localize the working element while also minimizing embolic events. It that sense, it is substantially sealing against the treatment region, but such seal is not necessarily an "airtight" seal, but an approximation that performs the desired functions listed above.
• certain stabilizing devices 36, 38 may be located on the main catheter shaft 12 to provide stability within the aorta, and may, in some cases, extend through the valve leaflets L below the valve to further stabilize the treatment device, as shown in Fig. 14.
• a system could include a main guide catheter GC placed over the treatment area as depicted in Fig. 15:
• the treatment area include the coronary leaflet (CL), the non-coronary leaflet (NCL) and the non-coronary leaflet (center) (NCLC).
• CL coronary leaflet
• NCL non-coronary leaflet
• NCLC non-coronary leaflet
• a first treatment catheter 40 having a distal housing 42 adapted to conform to the NCL is advanced as indicated by arrow Sl.
• the leaflet is treated and the NCL housing catheter is withdrawn as indicated by S2.
• the guide catheter position is then adjusted as indicated by arrow S3 to better approximate the CL.
• CL housing catheter is the advanced through the guide as indicated by arrow S4.
• the CL housing catheter is removed as indicated by arrow S 5.
• the guide catheter GC is then repositioned to treat NCLC as indicated by arrow S6, and finally the NCLC housing catheter is advanced through the guide according to arrow S7.
• the NCLC is removed as indicated by arrow S8 and the guide is removed and procedure completed.
• one leaflet may be treated only, more than one leaflet, and in any order according to the type of calcification, health of the patient, geometry of the target region or preference of the operator.
• a treatment catheter 50 having an ultrasonic probe for decalcifying the leaflet.
• An ultrasonic probe 52 may be surrounded by a frame or sheath 54. Both the frame and the sheath may be connected to a source of ultrasonic vibration (not shown), hi certain embodiments, the probe 52 is surrounded by a sheath or housing that enables the system to be substantially sealed against the treatment surface via a source of suction attached at the proximal end of the catheter system and connected to the catheter housing via a suction lumen in the catheter body.
• the system may be placed or localized at the treatment site with a mechanical clip or interface that physically attaches the housing to the treatment area (annulus or leaflet), hi operation, the ultrasonic probe 52 is activated to disintegrate the calcium on the leaflets, creating debris that may then be removed through a suction lumen in the catheter body 50.
• the ultrasonic probe 52 is activated to disintegrate the calcium on the leaflets, creating debris that may then be removed through a suction lumen in the catheter body 50.
• the ultrasonic probe 70 may be a separate element, allowing the ultrasonic treatment catheter 72 to move independently within the sealed region.
• the treatment probe 70 may be operated in a variety of directions and patterns that are further detailed in the specification, including sweeping in a circular pattern along the cusp of each leaflet and creating concentric circles during treatment to effectively treat the entire leaflet, if necessary.
• the ultrasonic element may be coaxial with the suction housing and adapted to move independently therewithin.
• a treatment catheter 80 may be placed through a series of guide catheters 82, 84 to assist placement accuracy.
• the first guide member 84 may be placed and anchored in the aortic root using either the shape of the guide to anchor against the aortic wall, or a separate balloon or filter device to stabilize the guide or a stabilizing ring made from shape memory material or other suitable material that can provide stabilization to allow the catheter to be directed to the treatment site.
• a second steerable or articulable catheter 82 may then be placed through the initial guide to direct the treatment catheter to one area of the leaflet or other.
• the treatment catheter 80 may then be placed through the system once these guides are in place, and deployed directly to the targeted valve region.
• the steerable guide may then be actuated to target the next treatment location, thereby directing the treatment catheter (and related filtering devices) to the next site. It may only be necessary to place one guide catheter prior to the treatment catheter, or alternatively, the treatment catheter may be steerable, allowing it to be placed directly to the treatment site without the aid of other guide catheters.
• the guide catheter may also be steerable and an integral part of the treatment catheter. Steerable guides such as those depicted in US Patent Publications 2004/0092962 and 2004/0044350 are examples, the contents of which is expressly incorporated by reference in its entirety. Treatment device may then re-directed to a second treatment site, as shown in Fig. 22..
• the distal portion 90 of the treatment catheters of the present invention may be shaped to substantially correspond to a shape of the targeted leaflet L (e.g., formed to fit within shape of the leaflet cusp, with the mouth of the housing being shaped to conform to the leaflet shape as shown in Fig. 23). This also enables the surface of the leaflet to be stabilized for treatment.
• the distal portion may have an internal frame that supports the distal section during deployment and treatment but is flexible such that it collapses into the treatment catheter or sheath to assist with withdrawal.
• the treatment catheter 100 of the present invention may be formed having a circumferential, annular treatment 102 surface to apply energy/vibration to the ⁇ annulus to be treated.
• the catheter may be placed antegrade or retrograde, or two circumferential treatment surfaces may be used in conjunction with each other, as shown in Fig. 24.
• the distal tip of an ultrasonic catheter may be coupled to a ultrasound transmission member or waveguide.
• the distal tip may be chosen from the various examples below, including a blunt tip, a beveled tip, a rounded tip, a pointed tip and may further include nodules or ribs (Fig. 25C) that protrude from the surface of the tip to enhance breakup of calcium. Arrows show exemplary patterns of use.
• the distal tip of the ultrasonic catheters of the present invention may also take the shape of the waveguide tips that are shown and described in U.S. Patent No. 5,304,115, the contents of which is expressly incorporated by reference herein.
• U.S. Patent No. 5,989,208 (“Nita"), the contents of which is expressly incorporated by reference herein, illustrate some additional tips in FIGS. 2-7A that may also be useful for decalcifying a valve leaflet.
• the ultrasound transmission members of the present invention may comprise a solid tube that is coupled to an enlarged distal working end.
• a central lumen may extend throughout the ultrasonic transmission member and may be used for aspiration, suction, and/or to receive a guidewire.
• the enlarged working end 110 (which has a larger diameter than the elongate proximal portion), may comprise a cylindrical portion that comprises a plurality of elongated members 112.
• the elongated members are arranged in castellated pattern (e.g., a circular pattern in which each of the elongated members extend distally) and provide an opening along the longitudinal axis of the ultrasound transmission member. While the elongated members are cylindrically shaped, in other embodiments, the elongated members may be rounded, sharpened, or the like.
• a central lumen may extend through the ultrasound transmission element and through the enlarged distal working end.
• the distal working end 120 is enlarged and rounded.
• the portion of the ultrasound transmission element (or waveguide) that is adjacent the distal working end may be modified to amplify the delivery of the ultrasonic waves from the working end.
• the waveguide may comprises a plurality of axial slots in the tubing that act to create a plurality of "thin wires" from the tubing, which will cause the ultrasonic waves to move radially, rather than axially.
• the enlarged distal working end may then be attached to the plurality of thin wires. Two embodiments of such a configuration are illustrated in FIGS. 32 and 33.
• each castellation may be housed on its own shaft extending back to the proximal end of the device. Other potential tip geometries are depicted below.
• the ultrasonic catheters of the present invention may be adapted to impart motion to the distal tip that is oscillatory, dottering, circular, lateral or any combination thereof.
• distal tips described herein, Applicants have found that the use of a small distal tip relative to the inner diameter of the catheter body provides a better amplitude of motion and may provide improved decalcification.
• an ultrasonic tip of the present invention can be operated in a variety of treatment patterns, depending on the region of the leaflet or annulus that is being treated, among other things.
• the treatment pattern may be a circular motion to provide rings of decalcification on the surface being treated, a cross-hatching pattern to break up larger deposits of calcium (FIG. 24), or a hemispherical (FIG. 36) or wedge-shaped (FIG. 37) pattern when one leaflet or region is treated at a time. It is within the scope of the present invention to use combinations of any of the patterns listed, or to employ more random patterns, or simply a linear motion.
• Certain safety mechanisms may be incorporated on the treatment catheter and related components to ensure that the treatment device does not perforate or otherwise degrade the leaflet, hi one embodiment, a force limiting feature may be incorporated into the treatment catheter shaft as shown in FIG. 38, where a structure 140 can contract in response to force applied to catheter 142 in the direction of arrows 144.
• features of the catheter shaft may limit the force that is delivered to the tissues.
• the treatment catheter 200 may be advanced through a sheath 202 that acts as a depth limiter to the treatment catheter as shown in FIGS. 41 and 42. These various safety features may be incorporated into any of the treatment devices of the present invention, regardless of the energy employed.
• An assembly of an ultrasonic catheter of the present invention is shown in FIG. 43 , including an ultrasonic transmission member 210, a transmission-head 212, a guide wire GW, a suction cup 214, a spring 216, and catheter body 218.
• an ultrasonic catheter 220 includes a PZT stack 222 and a distal horn 224 at the distal end of the device as shown in FIG. 44
• the proximal end of the ultrasonic catheter of the present invention may be configured according to the schematic depicted in FIG. 45.
• Knobs 230 on a proximal housing 232 are coupled to control wires that are connected to the distal end of the device. These knobs operate to tension the control wires thereby manipulating the angle of the distal end.
• Controls 234 for the steerable guide, such as gearing, pins, and shafts, are housed in the control box 236 on which the knobs are located.
• the main body of the treatment device further comprises an outer shaft and an inner shaft connected to slide knob.
• the inner shaft is operatively connected at the distal end of the device to the housing such that when the slide knob is retracted the housing is translated from a retracted position to an extended position, or vice versa.
• a drive shaft or drive coil 230 that is operatively connected to an energy source or prime mover, for imparting motion to the drive coil.
• Drive coil terminates in the distal end of the device at the working element that contacts the tissue to be treated.
• the ultrasonic waveguide or transmission element may be positioned within the outer shaft and/or inner shaft.
• the catheters will comprise a catheter body that comprises one or more lumens.
• a drive shaft (or similar element) may extend from a proximal end of one of the lumens to the distal end of the lumen.
• a distal working element may be coupled to (or formed integrally from) the drive shaft and will be configured to extend at least partially beyond a distal end of the catheter body.
• the proximal end of the drive shaft maybe coupled to a source of mechanical motion (rotation, oscillation, and/or axial movement) to drive the drive shaft and distal working element.
• the catheters of the present invention may use a variety of configurations to decalcify the leaflet. Some examples of the working elements and distal ends of the catheter body that may be used are described below.
• the distal end of the catheter 240 comprises a suction housing 242 that may be used to contact and/or isolate the leaflet that is being decalcified. While the suction housing is illustrated as a funnel shaped element, in alternative embodiments, the suction housing may be of a similar shape as the leaflets that are to be treated (as described above).
• the suction housing 242 may be fixedly coupled to the distal end of the catheter body 240 or it may be movably coupled to the distal end portion, hi such movable embodiments, the suction housing may be moved from a retracted position (not shown), in which the suction housing is at least partially disposed within the lumen of the catheter body, to an expanded configuration (shown below).
• a mechanical clip, clamp or other fixation element may be used to localize the treatment device at the annulus or leaflet to be treated such as that depicted below, including an element placed from the retrograde direction and the antegrade direction to secure the leaflets.
• the distal working element may comprise a rotatable, eccentrically loaded coil 250.
• the distal portion of the coil may taper in the distal direction and may comprise a ball 252 (or other shaped element) at or near its distal end.
• one or more weighted elements may be coupled along various portions of the coil to change the dynamics of the vibration of the coil. As can be appreciated, if the weight is positioned off of a longitudinal axis of the coil, the rotation profile of the coil will change. Consequently, strategic placement of the one or more weights could change the vibration of the coil from a simple rotation, to a coil that also has an axial vibration component.
• the working element may comprise an eccentrically loaded non-tapering coil 260.
• the coil may or may not comprise a ball or weight at its distal tip.
• the distal coil may comprise an elongated distal wire tip 270 in which at least a portion extends radially beyond an outer diameter of the distal coil working element.
• the distal wire tip may comprise one (or more) balls or weights.
• the distal wire tip may be curved, straight or a combination thereof.
• the distal working element may comprise a "drill bit” type impeller or a Dremel type oscillating or rotating member at the distal tip that is configured to contact the calcification and mechanically remove the calcification from the leaflet.
• a "drill bit” type impeller or a Dremel type oscillating or rotating member at the distal tip will be rotated and oscillated in a non-ultrasonic range of operation, and typically about 10Hz to 20,000Hz, preferably 100Hz to 1000Hz.
• rotation of the shaped impellers will typically cause the calcification debris to be moved proximally toward the lumen in the catheter body.
• the impeller may comprise rounded edges so as to provide some protection to the leaflets.
• a sheath may cover the rotating elements to provide protection or to provide more directed force by transmitting the rotational and axial movements through the sheath.
• the working elements may also comprise mechanically rotating devices.
• an oval shaped burr 280 is shown that the orientation of which ranges from vertically aligned with the central axis of the device (rotating axis) to 90 degrees or more from the central axis of the device.
• This off axis orientation allows a range of debridement locations and may be more applicable for certain situations, such as stenoses that are located eccentrically within the valve annulus, or to treat leaflet surfaces that are angled with respect to the central axis of the device.
• Angulation of the treatment tip relative to the central axis of the treatment device facilitates fragmentation of the calcification by providing increased velocity at the tip region.
• a similar arrangement is shown in FIG.
• FIG. 52 shows a burr element 284 in the form of a disk having holes in the face of the disk to allow evacuation of debris through the burr element.
• any mechanical working elements may have a roughened surface, a carbide tip material, or diamond coating to enhance fragmentation of the targeted material.
• Representative burr elements are manufactured by several companies such as Ditec Manufacturing (Carpenteria, CA), Diamond Tool (Providence, RI), and Carbide Grinding Co. (Waukesha, WI).
• an impeller element 290 (FIG. 53) proximal to the aortic valve and not actually contact the leaflets.
• the rotation of the impeller may cause a vortex to remove calcific material off of the leaflet and into the suction housing and catheter body.
• the impeller may take a variety of forms such as the one described in United States Patent 4,747,821 to Kensey, the contents of which are expressly incorporated herein by reference.
• a rotating grinder head 292 may be coupled to the distal coil 294.
• the rotating grinder distal tip can take a variety of shapes.
• the grinder distal tip is convex shaped and comprises a plurality of holes that are in a radial circular pattern around a central opening that is in communication with an axial lumen of the drive shaft.
• the grinder distal tip is symmetrically positioned about the longitudinal axis of the distal coil and the rest of the drive shaft.
• the radial openings allow for irrigation and aspiration of particles.
• the grinder distal tip may comprise abrasive material, such as diamond dust, to assist in removal of the calcific material from the aortic valve.
• the grinder distal tip may comprise a flat pate 300.
• the flat grinder distal tip may comprise an abrasive material, holes, and/or machined protrusions or nubs. Such elements may be used to enhance the calcification removal from the leaflet.
• a grinder distal tip 304 may be mounted eccentrically about the distal coil 306 so that upon rotation, the grinder tips may cover a greater surface area of the leaflet without having to enlarge the size of the grinder distal tip.
• the figure below illustrates the flat grinder distal tip, but it should be appreciated that any of the distal tips described herein may be mounted eccentrically with the distal coil.
• the distal working element may comprise a castellated mechanical tip, such as that shown above for the ultrasonic working element.
• the castellated tip may have an impeller that is set back from the distal tip.
• the present invention may use the Rotablator device that is described in U.S. Patent No. 5,314,407 or 6,818,001, the complete disclosure of which are expressly incorporated herein by reference, to decalcify a leaflet.
• the Rotablator (as shown below) may be used as originally described, or the distal tip maybe modified by flattening the tip, applying diamond dust on the tip, making the distal tip more bulbous, or the like. See Fig. 58 which is taken from the '407 patent.
• the air turbine used for the Rotablator may be used to power some or all of the aforementioned mechanically-based treatment catheters. The air turbine provides an appropriate amount of torque and speed for disruption of calcium on the leaflets.
• the torque and speed combined with a low moment of inertia of the drive shaft and distal tips of the present invention, reduce the risk of catastrophic drive shaft failure. For example, when the distal tip becomes "loaded” due to contact with the calcific deposits, the speed of rotation will reduce to zero without snapping or wrapping up the drive shaft.
• the air turbine it may also be possible to use a motor with an electronic feedback system that can sense torque and speeds such that the motor may be slowed down at appropriate times.
• the treatment catheter may comprise an optional sheath that surrounds the distal working element.
• the sheath may comprise a spherical shaped distal tip 310 that surrounds the distal working element.
• An elongated proximal portion is attached to the spherical distal tip and is sized and shaped to cover some or all of the drive shaft that is within the lumen of the catheter body.
• the spherical shaped distal tip may comprise an opening 312 that will allow for the delivery of a media (e.g., contrast media, coolant, etc.) and/or for passageway of a guidewire.
• the mechanical element or ultrasonic transmission element may extend beyond the tip of the sheath.
• a similar depiction is shown in United States Patent 6,843,797 to Nash, the contents of which are expressly incorporated herein by reference.
• the sheath may comprise bellows or a flexible portion that allows for the end of the sheath to bend, extend, and/or retract.
• the sheath will typically not rotate, and the sheath will typically be sized to allow the distal working element and the drive shaft to rotate within the sheath. Rotation of the distal working element within the sheath will articulate the sheath (which will depend on the shape and type of actuation of the drive shaft) and may create a "scrubbing effect" on the calcific deposits.
• the sheath will transmit the mechanical motion of the drive shaft, while providing a layer of protection to the leaflets by controlling the oscillation of the working element.
• the sheath may be made of a variety of materials as known in the art and reinforced in such a way as to withstand the friction from the rotation of the distal working element within the spherical distal tip Consequently, one useful material for the sheath is steel, or a braided or other catheter reinforcement technique.
• a cooling fluid may be to decrease the heat energy seen by the tissue, and assist in the removal of debris during debridement. Such a fluid may also assist with tissue fragmentation by providing a cavitation effect in either the ultrasonic embodiments or the mechanical embodiments.
• the ultrasound treatment catheters and the mechanical treatment catheters comprise a lumen that runs through the catheter body to the distal end. It may be useful to deliver a media, such as a cooling fluid, an ultrasound contrast fluid, or the like, through the lumen to the target leaflet to amplify the effect of the energy delivery to the embedded calcific nodules on the leaflet.
• the media may comprise microspheres or microbubbles.
• One useful contrast media that may be used with the methods and treatment catheters of the present invention is the OptisonTM contrast agent (GE Healthcare).
• Delivery of the ultrasonic wave through the contrast media that contains the microbubbles can increase the amount of cavitation or fragmentation energy delivered to the leaflet. Applying suction during the procedure can also enhance the fragmentation energy as described by Cimino and Bond, "Physics of Ultrasonic Surgery using Tissue Fragmentation: Part I and Part II", Ultrasound in Medicine and Biology, Vol. 22, No. 1, pp. 89-100, and pp. 101-117, 1996. It has been described that the interaction of gas bodies (e.g., microbubbles) with ultrasound pulses enhances non-thermal perturbation (e.g., cavitation-related mechanical phenomena).
• gas bodies e.g., microbubbles
• ultrasound pulses enhances non-thermal perturbation (e.g., cavitation-related mechanical phenomena).
• the use of microbubbles are not limited to the ultrasound or mechanical treatment catheters.
• the contrast media may be used with an RF catheter or a piezoelectric-based catheter.
• the catheter body may comprise two RF electrodes positioned at or near the distal end of the catheter.
• the media with the microbubbles may be delivered to the target leaflet through the lumen of the catheter, and an RF energy may be delivered between two leads to deliver energy to the microbubbles.
• a piezo film 330 at the distal tip of the catheter (Fig. 60).
• Wire leads will extend through, within (or outside) the lumen of the catheter body and will be coupled to a generator. If the wire leads are disposed within the lumen of the catheter body, the catheter may comprise an inner tube to insulate the wires. The media may be delivered through the inner lumen of the catheter body and exposed to the piezo film at the distal end of the catheter body, and the energy may be delivered from the piezo film and into the media with the microbubbles.
• protection devices and methods may be used to trap and evacuate debris from the treatment site, hi one embodiment shown in Figs. 61 and 62, a filter device 336 is located on the shaft of a guide catheter 338. This structure may also provide anchoring of the guide catheter in the aortic root to provide a stable access system to the valve or placing additional treatment catheters.
• a filter device is deployed to protect the entire region of treatment and may include a systemic filtering device 340 such as those where blood and aspirate are removed from the arterial side of the vasculature, filtered and then infused back into the venous circulation, further details in United States Patent 6,423,032 to Parodi, the disclosure of which is expressly incorporated herein by reference.
• a suction port 342 surrounds the ultrasound probe 344 at the distal end of catheter 346.
• Such a filtering device may be used in conjunction with treatment devices, such as the ultrasonic suction catheter shown in Fig. 64, where filter device 350 covers a single leaflet which is also engaged by ultrasonic probe 352 at suction port 354. Further, the filter shape may be optimized to access the most relevant leaflet or treatment site, as shown in Fig. 6. Any of the above filtering or protection systems may be used with any of the treatment catheters disclosed herein.
• Numerous features of the present invention aid in directing, positioning and stabilizing the treatment catheter optimally at the site of the disease to be treated.
• certain methods may be used to position the catheter.
• the heart may be connected to a pacing lead and the heart then paced at an increased rate, for example 200 beats per minute, which then holds the aortic leaflets in a relatively fixed location arresting blood flow and allowing the treatment catheter of the present invention to be applied to at least one leaflet.
• FIG. 1 A block diagram illustrating an exemplary medical image.
• FIG. 1 A block diagram illustrating an exemplary medical image.
• FIG. 1 A block diagram illustrating an exemplary medical image.
• FIG. 1 A block diagram illustrating an exemplary medical image.
• FIG. 1 A block diagram illustrating an exemplary medical image.
• FIG. 1 A block diagram illustrating an exemplary medical image.
• FIG. 1 A block diagram illustrating an exemplary medical image.
• FIG. 1 A block diagrammatic ultrasound
• FIG. 1 A block diagram illustrating an exemplary medical image.
• FIG. 1 A block diagram illustrating an exemplary medical image.
• FIG. 1 A block diagram illustrating an exemplary medical image.
• FIG. 1 A block diagram illustrating an exemplary medical image.
• FIG. 1 A block diagram illustrating an exemplary medical image.
• FIG. 1 A block diagram illustrating an exemplary medical image.
• FIG. 1 A block diagram illustrating an exemplary medical image.
• FIG. 1 A block diagram illustrating an exemplary medical image.
• FIG. 1 A
• Imaging may become critical at various stages of the procedure, including diagnosing the type and location of the disease, placing the treatment catheter, assessing the treatment process, and verifying the function of the valve once it is treated.
• Imaging devices may be placed locally at the treatment site, such as on the catheter tip, or catheter body, alongside the treatment catheter, or in more remote locations such as known in the art (e.g. superior vena cava, esophagus, or right atrium). If the imaging element is placed on the treatment catheter, it may be adapted to be "forward looking" e.g. image in a plane or multiple planes in front of the treatment device.
• Elastography in this context may be performed using an intravascular ultrasound (IVUS) catheter, either a mechanical transducer or phased array system, such as those described in "Characterization of plaque components and vulnerability with intravascular ultrasound elastography” Phys. Med. Biol. 45 (2000) 1465 - 1475 , the contents of which is expressly incorporated by reference herein.
• IVUS intravascular ultrasound
• the transducer may be advanced to a treatment site on the valve, and using either externally applied force, or "periodic excitation" of the tissue region either by externally applied force or the naturally occurring movement in the tissue itself (such as the opening and closing of the valve leaflets), an initial baseline reading can be taken.
• This baseline could be set by engaging the region or leaflet to be treated with a suction catheter of the present invention (including circulating fluid within the treatment site), inserting an ultrasound transducer through the treatment catheter up to the treatment site, and interrogating the targeted region with the ultrasound transducer to establish the elasticity of the region (stress/strain profile).
• infusion can then be stopped, putting the leaflet under additional stress (by suction alone) and the displacement in the stress/strain profile can be noted and evaluated to direct the treatment device to those locations showing less elasticity ("stiffer" regions indicating the presence of calcific deposits. See also those techniques set forth in “Elastography - the movement begins” Phys. Med. Biol. 45 (2000) 1409-1421 and “Selected Methods for Imaging Elastic Properties of Biological Tissues" Annu. Rev. Biomed. Eng. (2003) 5:57-78, the contents of which are expressly incorporated by reference herein.
• the same transducer or fiber optic that is used to interrogate or image the region may also be used to break up or treat the underlying calcific deposits. Certain parameters may be adjusted to transition the therapy device from diagnostic to therapeutic, including frequency, power, total energy delivered, etc.
• characterization techniques may be employed to both target the calcific region to be treated or assess the result of a treatment, including MRI, Doppler, and techniques that utilize resistivity data, impedance/inductance feedback and the like.
• imaging and other monitoring techniques such as those described, can result in a more targeted procedure that focuses on removing calcific deposits and limits potential tissue damage to the leaflet and annulus that can lead to an unwanted proliferative response.
• a variety of energy modalities may be used in the treatment catheters envisioned by the present invention. Those modalities more specifically useful for breaking down or obliterating calcific deposits may be ultrasonic energy, laser energy and the like. Specifically, some Er: YAG lasers may specifically target calcium when operated in appropriate ranges. Some detail of targeted bone ablation supports this as found in "Scanning electron microscopy and Fourier transformed infrared spectroscopy analysis of bone removal using Er: YAG and CO 2 lasers" J Periodontal. 2002 Jun;73(6):643-52, the contents of which are expressly incorporated by reference herein.
• energy may be delivered to selectively remove tissue from around or over a calcium deposit by employing a resurfacing laser that selectively targets water-containing tissue resulting in controlled tissue vaporization, such as a high-energy pulsed or scanned carbon dioxide laser, a short-pulsed Er: YAG, and modulated (short-and-long-pulsed) Er: YAG system.
• a resurfacing laser that selectively targets water-containing tissue resulting in controlled tissue vaporization, such as a high-energy pulsed or scanned carbon dioxide laser, a short-pulsed Er: YAG, and modulated (short-and-long-pulsed) Er: YAG system.
• This application of energy may be useful for accessing plaque or calcium that is distributed between the leaflets (spongiosa).
• the ultrasonic treatment catheters of the present invention may be operated in ranges between 5 and 10OkHz, for example 10-5OkHz, with an oscillation rate in the range of 10-200 microns, for example 75-150 microns (maximum travel between 20-400 microns).
• a pulsed manner such as a 5-50% duty cycle, for example a 5-20% duty cycle, and to minimize the tissue that is exposed to the energy application by carefully targeting the delivery of energy to the most diseased regions.
• Figs. 66, 67, and 68 A schematic depiction of these various positions with the valve are depicted in Figs. 66, 67, and 68, where Fig. 67 and 68 are cross-sections along lines A-A and B-B of Fig. 66, respectively.
• the treatment catheters of the present invention may also be utilized to not only remove calcium, but also to remove or obliterate the leaflet itself, such as in preparation for implantation of a minimally invasive prosthetic valve, such as those disclosed in US Patents 5,840,081 and 6,582,462 to Anderson, US Patent Application 2004/0092858 to Wilson, PCT Publication WO 2004/093728 to Khairkhahan, WO 2005/009285 to Hermann and the like, the disclosures of which are expressly incorporated herein by reference.
• a minimally invasive prosthetic valve such as those disclosed in US Patents 5,840,081 and 6,582,462 to Anderson, US Patent Application 2004/0092858 to Wilson, PCT Publication WO 2004/093728 to Khairkhahan, WO 2005/009285 to Hermann and the like, the disclosures of which are expressly incorporated herein by reference.
• Pre-treatment with devices of the present invention may facilitate placement of such prosthetic valves since removing calcium from the site of implantation may reduce peri valvular leak, dislodgement, and may result in a larger prosthesis being implanted due to an increased effective valve orifice.
• devices may be provided which are temporarily or permanently implanted across or within the aortic valve.
• the devices which appear below are all intended to remain for at least a period of time within the body after the repair of the stenosis has been completed in order to prevent or delay the valves from degenerating, by either recalcifying, fusion of leaflets, and restenosing.
• An implant of the present invention is depicted in Fig. 67 in either a sub annular 360 or supra annular position 362.
• an implant such as the coil depicted below, to extend both sub annular and supra annular to provide additional support to the valve and provide a greater treatment area across the valve.
• the coil design of this embodiment has a single strut that joins the two ring portions but is low profile enough that is does not occlude the coronaries just above the valve annulus. See, Fig. 68. Because of its open structure, the supra annular portion of the implant can extend above the coronaries into the aortic root for additional anchoring. See, Fig. 69.
• the implant may be formed of a wire, series of wire, or cellular structure similar to that used in peripheral or coronary stents. To better seat in the valve annulus, or below the valve, it may be advantageous to form the implant ring to follow the cusps of the valve, in a sinusoidal form.
• the implant ring may have struts that extend to seat against the annulus of the valve to provide structure or further disseminate a pharmacologic coating at specific valve sites. See, Figs. 70, 71, and 72.
• the implant may be formed of multiple loops, such as three loops 120 degrees from each other. See, Figs. 73-76.
• the wire may have a diameter between 0.020" and 0.250" depending on the force desired, hi addition, the wire may be flat and the structure may include a mesh between the loops to provide a larger surface area for supporting the valve or delivery the pharmacologic agent.
• the loops of this device may be moved distally and proximally in a cyclic way to further open the valve leaflets and disrupt plaque as a stand alone therapy.
• the device may then be permanently implanted as detailed above. It may be desirable to recapture the device, either once the valve has been treated, or during positioning of the permanent implant to ensure proper placement.
• a recapture device may be the delivery catheter from which the implant is deployed, or may include an expandable funnel on the distal end of a retrieval catheter or may include any number of mechanical devices including a grasper or a hook that mates with a hook on the implant, or grasps the implant at some point such that it may be drawn into the delivery sheath and removed from the body.
• any of the implants described herein may have surface enhancements or coatings to make them radiopaque or echo genie for purposes of procedure assessment as is known in the art.
• the devices described may be permanent, removable, or bio-erodable. They can incorporate anti-restenosis agents or materials such as those set forth above, in the form of coatings, holes, depots, pores or surface irregularities designed into or applied onto the devices.
• the implants can be formed of certain calcification resistant materials such as those set forth in United States Patent 6,254,635, the contents of which are expressly incorporated by reference herein. Further, implants of the present invention may be configured to emit a slight electrical charge.
• Anti-restenosis agents which may be useful in this application may be chosen from any of the families of agents or energy modalities known in the art.
• pharmaceutical agents or their analogues such as rapamycin, paclitaxel, sirolimus or nitric-oxide enhancing agents may be coated onto these devices using drug eluting coatings, incorporated into intentionally created surface irregularities or specific surface features such as holes or divots.
• the devices may be designed for drug infusion through the incorporation of coatings or other surfaces to adhere the agents to the implants utilized to perform the procedures of the present invention, or may be prescribed for oral administration following procedures of the present invention.
• a patient may be prescribed a dose of statins, ACE inhibitors or other drugs to prolong the valve function provided by the intervention.
• Figs. 77-89 represent various embodiments of systems intended for acute or sub- chronic procedures. These devices may be placed across the aortic valve and expanded to reopen the aortic valve, and then left in place for a period of time in order to expose the treated valve to anti-restenosis agents or energy modalities designed to facilitate the repair and/or to prevent restenosis.
• the device shown in Figs. 77 and 78 features mechanical vanes 400 which extend outward to engage and separate the fused leaflets at the commissures.
• the vanes may be made of any suitable metal, plastic or combination.
• vanes may be self expanding (made from nitinol or elgiloy, for instance) or they might be mechanically actuated using a pneumatic, hydraulic, threaded or other mechanical actuation system.
• the vanes might be deformable members as shown above, or each vane might be made up of several more rigid parts connected at hinged portions to allow expansion and contraction of the unit.
• the vanes may be designed with a cross section which is rectangular in shape, with the narrower edge designed to facilitate separation of fused leaflets and to fit within the commissures without impacting the ability if he valves to close. The wider face of these rectangular vanes would contact the newly separated edges of the leaflets.
• the vanes might be designed to have more of a wing-shaped or other cross sectional shape to minimize turbulence within the bloodstream and to minimize trauma to the valve leaflets.
• the device of Figs. 79 and 80 shows a balloon system to be used in accordance with the inventive methods.
• the balloon 410 may feature a plurality of holes 412 to be used for the infusion of anti-restenosis agents as described in more detail below. These holes maybe small enough to allow only a slight weeping of the agents to be infused, or they might be of a size which would allow more rapid infusion or a greater volume of infusate to be delivered.
• the holes might be placed in even distribution around the circumference of the balloon, or they might be placed to align more directly with the location of the commissures.
• the device of Figs. 8 land 82 comprise a balloon system which combines features of Figures 77 and 78 with those of 79 and 80. Several balloons are placed such that each balloon aligns with a commissure 424. Inflation of this device may allow continued perfusion of blood out of the heart and into the body which the device is in place. This in turn might low for more prolonged delivery of anti-restenosis agents. Holes might be placed on the balloons of Figure 3 similar to the description for the holes on the device in Figs. 79 and 80.
• Anti-restenosis agents which may be useful in this application may be chosen from any of the families of agents or energy modalities known in the art.
• pharmaceutical agents or their analogues such as rapamycin, paclitaxel, sirolimus or nitric- oxide enhancing agents maybe coated onto any of the inventive devices using drug eluting coatings, incorporated into intentionally created surface irregularities or specific surface features such as holes or divots.
• the devices may be designed for drug infusion through the incorporation of infusion channels and infusion holes in the work-performing elements of the devices such as the balloons or commissurotomy vanes shown in the drawings.
• Energy delivery may be achieved by several different modalities and for different purposes.
• Radiofrequency energy can be applied by energizing the commissurotomy vanes or by using the pores on the balloons to achieve a wet electrode.
• Microwave, ultrasound, high frequency ultrasound energy or pulsed electric fields might be used by incorporating antennae or electrodes into the vanes, balloons or catheter shafts that support these work performing elements.
• Cryotherapy can be achieved by circulating cooling fluids such as phase-change gases or liquid nitrogen through the work performing elements. Multiple modalities might be incorporated into a single device for achieving the goal of durable aortic valve repair.
• This energy may be used to facilitate the valve repair, for instance by making easier the parting of fused leaflets.
• the energy may be used to delay or prevent restenosis of the treated valve.
• One example of the use of energy delivery for the prevention of restenosis is the use of pulsed electric fields to induce cellular apoptosis. It is known in the art that the application of pulses of electricity on the order of nanosecond duration can alter the intracellular apparatus of a cell and induce apoptosis, or programmed cell death, which is known to be a key aspect of the mechanism of action of the clinically proven anti-restenosis drugs such as paclitaxel or sirolimus.
• agents or energy applications might be administered while the patient is in the catheterization lab, over the course of minutes to hours.
• the devices may be designed to allow the patient to return to the hospital floor with the device in place, so that the infusion of agents or the application of energy could proceed over the course of hours or days.
• devices may be provided which are temporarily or permanently implanted across or within the aortic valve.
• the devices which appear below are all intended to remain for at least a period of time within the body after the repair of the stenosis has been completed in order to prevent or delay the valves from readhering to one another and restenosing.
• the devices described may be permanent, removable, or bio-erodable. They can incorporate anti-restenosis agents or materials into coatings, holes, depots, pores or surface irregularities designed into or applied onto the devices
• the struts 430 may be made of any suitable metal, plastic or combination as shown in Figs. 83 and 84. They may be self expanding (made from nitinol or elgiloy, for instance) or they might be mechanically actuated during implantation using a pneumatic, hydraulic, threaded or other mechanical actuation system and then locked into their final position prior to deployment of the device from the delivery system.
• the struts might be deformable members as shown above, or each strut might be made up of several more rigid parts connected at hinged portions to allow expansion and contraction of the unit.
• the struts may be designed with a cross section which is rectangular in shape, with the narrower edge designed to facilitate separation of fused leaflets and to fit within the commissures without impacting the ability if he valves to close. The wider face of these rectangular struts would contact the newly separated edges of the leaflets.
• the struts might be designed to have more of a wing-shaped or other cross sectional shape to minimize turbulence within the bloodstream and to minimize trauma to the valve leaflets.
• Figs. 85-89 show alternate designs for the implantable device. It should be noted that any design for the implant which achieves the goals of providing long-term anti- restenosis agents or energy modalities to the treated regions of the repaired leaflets should be considered as subjects of this invention.
• Anchoring elements which lie against the wall of the aorta and are generally contiguous with the struts (as shown in Figs. 83 and 84), which join in the center of the aorta before reforming with the struts (as in Figs. 85 and 86), or designs in which the struts themselves are the anchoring elements (as in Figs. 87-89) are all embodiments of the subject invention.
• the implantable and bio-erodable devices might all feature pharmaceutical agents or their analogues such as rapamycin, paclitaxel, sirolimus or nitric-oxide enhancing agents, which maybe coated onto any of the inventive devices using drug eluting coatings, or incorporated into intentionally created surface irregularities or specific surface features such as holes or divots.
• pharmaceutical agents or their analogues such as rapamycin, paclitaxel, sirolimus or nitric-oxide enhancing agents, which maybe coated onto any of the inventive devices using drug eluting coatings, or incorporated into intentionally created surface irregularities or specific surface features such as holes or divots.
• Additional anti-restenosis agents or energy modalities might be delivered separate from and/or in addition to those agents that are incorporated onto the implant, for instance as a feature of the delivery system.

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