Patent Application
20060167437
Not Applicable
Not Applicable
1. Field of the Invention
This invention pertains generally to medical device systems and methods for intra aortic fluid delivery into regions of the body. More specifically, it is related to intra aortic renal fluid delivery systems and methods.
2. Description of Related Art
Many different medical device systems and methods have been previously disclosed for locally delivering fluids or other agents into various body regions, including body lumens such as vessels, or other body spaces such as organs or heart chambers. Local “fluid” delivery systems may include drugs or other agents, or may even include locally delivering the body's own fluids, such as artificially enhanced blood transport (e.g. either entirely within the body such as directing or shunting blood from one place to another, or in extracorporeal modes such as via external blood pumps etc.). Local “agent” delivery systems are herein generally intended to relate to introduction of a foreign composition as an agent into the body, which may include drug or other useful or active agent, and may be in a fluid form or other form such as gels, solids, powders, gases, etc. It is to be understood that reference to only one of the terms fluid, drug, or agent with respect to local delivery descriptions may be made variously in this disclosure for illustrative purposes, but is not generally intended to be exclusive or omissive of the others; they are to be considered interchangeable where appropriate according to one of ordinary skill unless specifically described to be otherwise.
In general, local agent delivery systems and methods are often used for the benefit of achieving relatively high, localized concentrations of agent where injected within the body in order to maximize the intended effects there and while minimizing unintended peripheral effects of the agent elsewhere in the body. Where a particular dose of a locally delivered agent may be efficacious for an intended local effect, the same dose systemically delivered would be substantially diluted throughout the body before reaching the same location. The agent's intended local effect is equally diluted and efficacy is compromised. Thus systemic agent delivery requires higher dosing to achieve the required localized dose for efficacy, often resulting in compromised safety due to for example systemic reactions or side effects of the agent as it is delivered and processed elsewhere throughout the body other than at the intended target.
Various diagnostic systems and procedures have been developed using local delivery of dye (e.g. radiopaque “contrast” agent) or other diagnostic agents, wherein an external monitoring system is able to gather important physiological information based upon the diagnostic agent's movement or assimilation in the body at the location of delivery and/or at other locations affected by the delivery site. Angiography is one such practice using a hollow, tubular angiography catheter for locally injecting radiopaque dye into a blood chamber or vessel, such as for example coronary arteries in the case of coronary angiography, or in a ventricle in the case of cardiac ventriculography.
Other systems and methods have been disclosed for locally delivering therapeutic agent into a particular body tissue within a patient via a body lumen. For example, angiographic catheters of the type just described above, and other similar tubular delivery catheters, have also been disclosed for use in locally injecting treatment agents through their delivery lumens into such body spaces within the body. More detailed examples of this type include local delivery of thrombolytic drugs such as TPA™, heparin, cumadin, or urokinase into areas of existing clot or thrombogenic implants or vascular injury. In addition, various balloon catheter systems have also been disclosed for local administration of therapeutic agents into target body lumens or spaces, and in particular associated with blood vessels. More specific previously disclosed of this type include balloons with porous or perforated walls that elute drug agents through the balloon wall and into surrounding tissue such as blood vessel walls. Yet further examples for localized delivery of therapeutic agents include various multiple balloon catheters that have spaced balloons that are inflated to engage a lumen or vessel wall in order to isolate the intermediate catheter region from in-flow or out-flow across the balloons. According to these examples, a fluid agent delivery system is often coupled to this intermediate region in order to fill the region with agent such as drug that provides an intended effect at the isolated region between the balloons.
The diagnosis or treatment of many different types of medical conditions associated with various different systems, organs, and tissues, may also benefit from the ability to locally deliver fluids or agents in a controlled manner. In particular, various conditions related to the renal system would benefit a great deal from an ability to locally deliver of therapeutic, prophylactic, or diagnostic agents into the renal arteries.
Acute renal failure (“ARF”) is an abrupt decrease in the kidney's ability to excrete waste from a patient's blood. This change in kidney function may be attributable to many causes. A traumatic event, such as hemorrhage, gastrointestinal fluid loss, or renal fluid loss without proper fluid replacement may cause the patient to go into ARF. Patients may also become vulnerable to ARF after receiving anesthesia, surgery, or α-adrenergic agonists because of related systemic or renal vasoconstriction. Additionally, systemic vasodilation caused by anaphylaxis, and anti-hypertensive drugs, sepsis or drug overdose may also cause ARF because the body's natural defense is to shut down, i.e., vasoconstrict, non-essential organs such as the kidneys. Reduced cardiac output caused by cardiogenic shock, congestive heart failure, pericardial tamponade or massive pulmonary embolism creates an excess of fluid in the body, which can exacerbate congestive heart failure. For example, a reduction in blood flow and blood pressure in the kidneys due to reduced cardiac output can in turn result in the retention of excess fluid in the patient's body, leading, for example, to pulmonary and systemic edema.
Previously known methods of treating ARF, or of treating acute renal insufficiency associated with congestive heart failure (“CHF”), involve administering drugs. Examples of such drugs that have been used for this purpose include, without limitation: vasodilators, including for example papavarine, fenoldopam mesylate, calcium-channel blockers, atrial natriuretic peptide (ANP), acetylcholine, nifedipine, nitroglycerine, nitroprusside, adenosine, dopamine, and theophylline; antioxidants, such as for example acetylcysteine; and diuretics, such as for example mannitol, or furosemide. However, many of these drugs, when administered in systemic doses, have undesirable side effects. Additionally, many of these drugs would not be helpful in treating other causes of ARF. While a septic shock patient with profound systemic vasodilation often has concomitant severe renal vasoconstriction, administering vasodilators to dilate the renal artery to a patient suffering from systemic vasodilation would compound the vasodilation system wide. In addition, for patients with severe CHF (e.g., those awaiting heart transplant), mechanical methods, such as hemodialysis or left ventricular assist devices, may be implemented. Surgical device interventions, such as hemodialysis, however, generally have not been observed to be highly efficacious for long-term management of CHF. Such interventions would also not be appropriate for many patients with strong hearts suffering from ARF.
The renal system in many patients may also suffer from a particular fragility, or otherwise general exposure, to potentially harmful effects of other medical device interventions. For example, the kidneys as one of the body's main blood filtering tools may suffer damage from exposed to high density radiopaque contrast dye, such as during coronary, cardiac, or neuro angiography procedures. One particularly harmful condition known as “radiocontrast nephropathy” or “RCN” is often observed during such procedures, wherein an acute impairment of renal function follows exposure to such radiographic contrast materials, typically resulting in a rise in serum creatinine levels of more than 25% above baseline, or an absolute rise of 0.5 mg/dl within 48 hours. Therefore, in addition to CHF, renal damage associated with RCN is also a frequently observed cause of ARF. In addition, the kidneys' function is directly related to cardiac output and related blood pressure into the renal system. These physiological parameters, as in the case of CHF, may also be significantly compromised during a surgical intervention such as an angioplasty, coronary artery bypass, valve repair or replacement, or other cardiac interventional procedure. Therefore, the various drugs used to treat patients experiencing ARF associated with other conditions such as CHF have also been used to treat patients afflicted with ARF as a result of RCN. Such drugs would also provide substantial benefit for treating or preventing ARF associated with acutely compromised hemodynamics to the renal system, such as during surgical interventions.
There would be great advantage therefore from an ability to locally deliver such drugs into the renal arteries, in particular when delivered contemporaneous with surgical interventions, and in particular contemporaneous with radiocontrast dye delivery. However, many such procedures are done with medical device systems, such as using guiding catheters or angiography catheters having outer dimensions typically ranging between about 4 French to about 12 French, and ranging generally between about 6 French to about 8 French in the case of guide catheter systems for delivering angioplasty or stent devices into the coronary or neurovascular arteries (e.g. carotid arteries). These devices also are most typically delivered to their respective locations for use (e.g. coronary ostia) via a percutaneous, translumenal access in the femoral arteries and retrograde delivery upstream along the aorta past the region of the renal artery ostia. A Seldinger access technique to the femoral artery involves relatively controlled dilation of a puncture hole to minimize the size of the intruding window through the artery wall, and is a preferred method where the profiles of such delivery systems are sufficiently small. Otherwise, for larger systems a “cut-down” technique is used involving a larger, surgically made access window through the artery wall.
Accordingly, an intra aortic renal agent delivery system for contemporaneous use with other retrogradedly delivered medical device systems, such as of the types just described above, would preferably be adapted to allow for such interventional device systems, in particular of the types and dimensions just described, to pass upstream across the renal artery ostia (a) while the agent is being delivered into the renal arteries, and (b) while allowing blood to flow downstream across the renal artery ostia, and (c) in an overall cooperating system that allows for Seldinger femoral artery access. Each one of these features (a), (b), or (c), or any sub-combination thereof, would provide significant value to patient treatment; an intra aortic renal delivery system providing for the combination of all three features is so much the more valuable.
Notwithstanding the clear needs for and benefits that would be gained from such intra aortic drug delivery into the renal system, the ability to do so presents unique challenges as follows.
In one regard, the renal arteries extend from respective ostia along the abdominal aorta that are significantly spaced apart from each other circumferentially around the relatively very large aorta. Often, these renal artery ostia are also spaced from each other longitudinally along the aorta with relative superior and inferior locations. This presents a unique challenge to deliver drugs or other agents into the renal system on the whole, which requires both kidneys to be fed through these separate respective arteries via their uniquely positioned and substantially spaced apart ostia. This becomes particularly important where both kidneys may be equally at risk, or are equally compromised, during an invasive upstream procedure—or, of course, for any other indication where both kidneys require renal drug delivery. Thus, an appropriate intra aortic delivery system for such indications would preferably be adapted to feed multiple renal arteries perfusing both kidneys.
In another regard, mere delivery of an agent into the natural, physiologic blood flow path of the aorta upstream of the kidneys may provide some beneficial, localized renal delivery versus other systemic delivery methods, but various undesirable results still arise. In particular, the high flow aorta immediately washes much of the delivered agent beyond the intended renal artery ostia. This reduces the amount of agent actually perfusing the renal arteries with reduced efficacy, and thus also produces unwanted loss of the agent into other organs and tissues in the systemic circulation (with highest concentrations directly flowing into downstream circulation).
In still a further regard, various known types of tubular local delivery catheters, such as angiographic catheters, other “end-hole” catheters, or otherwise, may be positioned with their distal agent perfusion ports located within the renal arteries themselves for delivering agents there, such as via a percutaneous translumenal procedure via the femoral arteries (or from other access points such as brachial arteries, etc.). However, such a technique may also provide less than completely desirable results.
For example, such seating of the delivery catheter distal tip within a renal artery may be difficult to achieve from within the large diameter/high flow aorta, and may produce harmful intimal injury within the artery. Also, where multiple kidneys must be infused with agent, multiple renal arteries must be cannulated, either sequentially with a single delivery device, or simultaneously with multiple devices. This can become unnecessarily complicated and time consuming and further compound the risk of unwanted injury from the required catheter manipulation. Moreover, multiple dye injections may be required in order to locate the renal ostia for such catheter positioning, increasing the risks associated with contrast agents on kidney function (e.g. RCN)—the very organ system to be protected by the agent delivery system in the first place. Still further, the renal arteries themselves, possibly including their ostia, may have pre-existing conditions that either prevent the ability to provide the required catheter seating, or that increase the risks associated with such mechanical intrusion. For example, the artery wall may be diseased or stenotic, such as due to atherosclerotic plaque, clot, dissection, or other injury or condition. Finally, among other additional considerations, previous disclosures have yet to describe an efficacious and safe system and method for positioning these types of local agent delivery devices at the renal arteries through a common introducer or guide sheath shared with additional medical devices used for upstream interventions, such as angiography or guide catheters. In particular, to do so concurrently with multiple delivery catheters for simultaneous infusion of multiple renal arteries would further require a guide sheath of such significant dimensions that the preferred Seldinger vascular access technique would likely not be available, instead requiring the less desirable “cut-down” technique.
In addition to the various needs for delivering agents into branch arteries described above, much benefit may also be gained from simply enhancing blood perfusion into such branches, such as by increasing the blood pressure at their ostia. In particular, such enhancement would improve a number of medical conditions related to insufficient physiological perfusion into branch vessels, and in particular from an aorta and into its branch vessels such as the renal arteries.
Certain prior disclosures have provided surgical device assemblies and methods intended to enhance blood delivery into branch arteries extending from an aorta. For example, intra-aortic balloon pumps (IABPs) have been disclosed for use in diverting blood flow into certain branch arteries. One such technique involves placing an IABP in the abdominal aorta so that the balloon is situated slightly below (proximal to) the branch arteries. The balloon is selectively inflated and deflated in a counterpulsation mode (by reference to the physiologic pressure cycle) so that increased pressure distal to the balloon directs a greater portion of blood flow into principally the branch arteries in the region of their ostia. However, the flow to lower extremities downstream from such balloon system can be severely occluded during portions of this counterpulsing cycle. Moreover, such previously disclosed systems generally lack the ability to deliver drug or agent to the branch arteries while allowing continuous and substantial downstream perfusion sufficient to prevent unwanted ischemia.
It is further noted that, despite the renal risks described in relation to radiocontrast dye delivery, and in particular RCN, in certain circumstances delivery of such dye or other diagnostic agents is indicated specifically for diagnosing the renal arteries themselves. For example, diagnosis and treatment of renal stenosis, such as due to atherosclerosis or dissection, may require dye injection into a subject renal artery. In such circumstances, enhancing the localization of the dye into the renal arteries may also be desirable. In one regard, without such localization larger volumes of dye may be required, and the dye lost into the downstream aortic flow may still be additive to impacting the kidney(s) as it circulates back there through the system. In another regard, an ability to locally deliver such dye into the renal artery from within the artery itself, such as by seating an angiography catheter there, may also be hindered by the same stenotic condition requiring the dye injection in the first place (as introduced above). Still further, patients may have stent-grafts that may prevent delivery catheter seating.
Notwithstanding the interest and advances toward delivering agents for treatment or diagnosis of organs or tissues, the previously disclosed systems and methods summarized immediately above generally lack the ability to effectively deliver agents from within a main artery and locally into substantially only branch arteries extending therefrom while allowing the passage of substantial blood flow and/or other medical devices through the main artery past the branches. This is in particular the case with previously disclosed renal treatment and diagnostic devices and methods, which do not adequately provide for local delivery of agents into the renal system from a location within the aorta while allowing substantial blood flow continuously downstream past the renal ostia and/or while allowing distal medical device assemblies to be passed retrogradedly across the renal ostia for upstream use. Much benefit would be gained if agents, such as protective or therapeutic drugs or radiopaque contrast dye, could be delivered to one or both of the renal arteries in such a manner.
Several more recently disclosed advances have included local flow assemblies using tubular members of varied diameters that divide flow within an aorta adjacent to renal artery ostia into outer and inner flow paths substantially perfusing the renal artery ostia and downstream circulation, respectively. Such disclosures further include delivering fluid agent primarily into the outer flow path for substantially localized delivery into the renal artery ostia. These disclosed systems and methods represent exciting new developments toward localized diagnosis and treatment of pre-existing conditions associated with branch vessels from main vessels in general, and with respect to renal arteries extending from abdominal aortas in particular.
However, such previously disclosed designs would still benefit from further modifications and improvements in order to: maximize mixing of a fluid agent within the entire circumference of the exterior flow path surrounding the tubular flow divider and perfusing multiple renal artery ostia; use the systems and methods for prophylaxis and protection of the renal system from harm, in particular during upstream interventional procedures; maximize the range of useful sizing for specific devices to accommodate a wide range of anatomic dimensions between patients; and optimize the construction, design, and inter-cooperation between system components for efficient, atraumatic use.
A need still exists for improved devices and methods for delivering agents principally into the renal arteries of a patient from a location within the patient's aorta adjacent the renal artery ostia along the aorta wall while at least a portion of aortic blood flow is allowed to perfuse downstream across the location of the renal artery ostia and into the patient's lower extremities.
A need still exists for improved devices and methods for substantially isolating first and second portions of aortic blood flow at a location within the aorta of a patient adjacent the renal artery ostia along the aorta wall, and directing the first portion into the renal arteries from the location within the aorta while allowing the second portion to flow across the location and downstream of the renal artery ostia into the patient's lower extremities. There is a further benefit and need for providing passive blood flow along the isolated paths and without providing active in-situ mechanical flow support to either or both of the first or second portions of aortic blood flow.
A need still exists for improved devices and methods for locally delivering agents such as radiopaque dye or drugs into a renal artery from a location within the aorta of a patient adjacent the renal artery's ostium along the aorta wall, and without requiring translumenal positioning of an agent delivery device within the renal artery itself or its ostium.
A need still exists for improved devices and methods for bilateral delivery of fluids or agents such as radiopaque dye or drugs simultaneously into multiple renal arteries feeding both kidneys of a patient using a single delivery device and without requiring translumenal positioning of multiple agent delivery devices respectively within the multiple renal arteries themselves.
A need still exists for improved devices and methods for delivery of fluids or agents into the renal arteries of a patient from a location within the patient's aorta adjacent the renal artery ostia along the aorta wall, and while allowing other treatment or diagnostic devices and systems, such as angiographic or guiding catheter devices and related systems, to be delivered across the location.
A need still exists for improved devices and methods for delivering fluids or agents into the renal arteries from a location within the aorta of a patient adjacent to the renal artery ostia along the aorta wall, and other than as a remedial measure to treat pre-existing renal conditions, and in particular for prophylaxis or diagnostic procedures related to the kidneys.
A need still exists for improved devices and methods for delivery of fluids or agents into the renal arteries of a patient in order to treat, protect, or diagnose the renal system adjunctive to performing other contemporaneous medical procedures such as angiograms other translumenal procedures upstream of the renal artery ostia.
A need still exists for improved devices and methods for delivering both an intra aortic drug delivery system and at least one adjunctive distal interventional device, such as an angiographic or guiding catheter, through a common delivery sheath.
A need also still exists for improved devices and methods for delivering both an intra aortic drug delivery system and at least one adjunctive distal interventional device, such as an angiographic or guiding catheter, through a single access site, such as a single femoral arterial puncture.
A need also still exists for improved devices and methods for treating, and in particular preventing, ARF, and in particular relation to RCN or CHF, by locally delivering renal protective or ameliorative drugs into the renal arteries, such as contemporaneous with radiocontrast injections such as during angiography procedures.
A need still exists for improved devices to deliver fluid agents bilaterally to both sides of the renal system from within the aorta system.
A need still exists for improved devices to deliver fluid agents bilaterally to both sides of the renal system without requiring cannulation of the renal arteries themselves.
A need also exists for improved devices to deliver fluid agents bilaterally to both sides of the renal system without substantially occluding, isolating, or diverting blood flow within the abdominal aorta.
In addition to these particular needs for selective fluid delivery into a patient's renal arteries via their ostia along the aorta, other similar needs also exist for fluid delivery into other branch vessels or lumens extending from other main vessels or lumens, respectively, in a patient.
These present embodiments therefore generally relate to intra aortic renal drug delivery systems generally from a position proximal to the renal arteries themselves; however, it is contemplated that these systems and methods may be suitably modified for use in other anatomical regions and for other medical conditions without departing from the broad scope of various of the aspects illustrated by the embodiments. For example, intra aortic fluid delivery according to various of these embodiments benefits from particular dimensions, shapes, and constructions for the subject devices herein described. However, suitable modifications may be made to deliver fluids to other multi-lateral branch structures from main body spaces or lumens, such as for example in other locations within the vasculature (e.g. right and left coronary artery ostia, fallopian tubes stemming from a uterus, or gastrointestinal tract.
One aspect of the invention is a local renal infusion system for treating a renal system in a patient from a location within the abdominal aorta associated with first and second flow paths within an outer region of abdominal aortic blood flow generally along the abdominal aorta wall and into first and second renal arteries, respectively, via their corresponding first and second renal ostia along an abdominal aorta wall in the patient. This system includes a local injection assembly with first and second injection ports. The local injection assembly is adapted to be positioned at the location with the first and second injection ports at first and second respective positions, respectively, corresponding with the first and second flow paths. The local injection assembly is also adapted to be fluidly coupled to a source of fluid agent externally of the patient when the local injection assembly is positioned at the location. Accordingly, the local injection assembly is adapted to inject a volume of fluid agent from the source, through the first and second injection ports at the first and second positions, respectively, and bi-laterally into the first and second renal arteries, also respectively. This assembly is in particular adapted to accomplish such localized bilateral renal delivery via the respective corresponding first and second renal ostia and without substantially altering abdominal aorta flow along the location.
According to certain further modes of this aspect, the local injection assembly is adapted to inject the volume of fluid agent into the first and second flow paths such that the injected volume flows substantially only into the first and second renal arteries without substantially diverting, occluding, or isolating one region of aortic blood flow with respect to the first or second regions of aortic blood flow.
Another further mode also includes a delivery member with a proximal end location and a distal end location with a longitudinal axis. The local injection assembly comprises first and second injection members with first and second injection ports, respectively, and is adapted to extend from the distal end location of the delivery member and is adjustable between a first configuration and a second configuration as follows. The local injection assembly in the first configuration is adapted to be delivered by the delivery member to the location. The local injection assembly at the location is adjustable from the first configuration to the second configuration such that the first and second first injection members are radially extended from the longitudinal axis with the first and second injection ports located at the first and second positions, respectively, at the first and second flow paths.
According to another mode, the local injection assembly includes an elongate body that is adapted to be positioned within the outer region. The first and second injection ports are spaced at different locations around the circumference of the elongate body such that the first and second injection ports are adapted to inject the volume of fluid agent in first and second different respective directions laterally from the elongate body and generally into the first and second flow paths, respectively.
According to one embodiment of this mode, a positioner cooperates with the elongate body and is adapted to position the elongate body within the outer region at the location. In one variation of this embodiment, the positioner is coupled to the elongate body and is adjustable from a first configuration to a second configuration. The positioner in the first configuration is adapted to be delivered to the location with the elongate body. The positioner at the location is adapted to be adjusted from the first configuration to the second configuration that is biased to radially extend from the elongate body relative to the first configuration and against the abdominal aorta wall with sufficient force so as to deflect the orientation of the elongate body into the outer region. In still a further embodiment, the positioner comprises a plurality of partial loop-shaped members such as described above.
In another mode of this aspect of the invention, the local injection assembly further includes an elongate body with a longitudinal axis and that is adapted to be positioned at the location. The first and second injection members in the first configuration have first radial positions relative to the longitudinal axis, and in the second configuration have second radial positions. The second radial positions are radially extended from the longitudinal axis relative to the first radial position.
In one embodiment of this mode, the first and second injection members are located on opposite respective sides of the elongate body around a circumference of the elongate body. In one variation of this embodiment, each of the first and second injection members extends between proximal and distal respective locations on each of the opposite respective sides of the elongate body, and in the second configuration the first and second injection members are biased outward from the elongate body between the respective proximal and distal respective locations.
In another embodiment, the local injection assembly is in the form of a generally loop-shaped member, such that the first and second injection members comprise first and second regions along the loop-shaped member, and whereas the first and second injection ports are located on each of the first and second regions. The loop-shaped member in the first configuration has a first diameter between the first and second injection ports such that the loop-shaped member is adapted to be delivered to the location. The loop-shaped member in the second configuration has a second diameter between the first and second injection ports that is greater than the first diameter and is sufficient such that the first and second positions generally correspond with first and second flow paths within the outer region, respectively. According to one variation of this embodiment, the local injection assembly in the second configuration for the loop-shaped member includes a memory shape. The loop-shaped member is adjustable from the second configuration to the first configuration within a radially confining outer delivery sheath. The loop-shaped member is adjustable from the first configuration to the second configuration by removing it from radial confinement outside of the outer delivery sheath.
In a further mode, first and second markers located along first and second injection members, respectively, at locations generally corresponding with the first and second injection ports. Each of the first and second markers is adapted to indicate to an operator externally of the patient the locations of the first and second injection ports to assist their delivery to the first and second positions, respectively. In particular beneficial embodiments, the first and second markers are radiopaque and provide guidance under fluoroscopy. In a further embodiment, the first and second injection members extend distally from the delivery member from a bifurcation location, and a proximal marker is located at the bifurcation location.
In another mode, a delivery member is provided that is an introducer sheath with a proximal end location and a distal end location that is adapted to be positioned at the location with the proximal end location of the introducer sheath extending externally from the patient. The delivery member includes a delivery passageway extending between a proximal port assembly along the proximal end location of the introducer sheath and a distal port at the distal end location of the introducer sheath. The injection assembly is adjustable between first and second positions. The first and second injection members are collapsed in the first longitudinal position and are extended radially from the distal end location in the second longitudinal position. In a further embodiment of this mode, the distal end location of the introducer sheath includes a distal tip and a delivery marker at a location corresponding with the distal tip such that the delivery marker is adapted to indicate the relative position of the distal tip within the abdominal aorta at the location.
In another further embodiment, a catheter body is provided with a proximal end location and a distal end location that is adapted to be positioned at the location when the proximal end location of the catheter body extends externally from the patient. The first and second injection members are coupled to and extend radially from the distal end location of the catheter body. The proximal port assembly of the introducer sheath comprises a single proximal port, and the first and second injection members and distal end location of the catheter body are adapted to be inserted into the delivery passageway through the single proximal port.
According to another mode, the system further includes a proximal coupler assembly that is adapted to be fluidly coupled to a source of fluid agent externally of the patient, and also to the first and second injection ports at the first and second positions, respectively.
In one embodiment, the proximal coupler assembly comprises first and second proximal couplers. The first proximal coupler is fluidly coupled to the first injection port, and the second proximal coupler is fluidly coupled to the second injection port. In one variation of this embodiment, a first elongate body extends between the first proximal coupler and the first injection member, and with a first fluid passageway coupled to the first proximal coupler and the first injection port; a second elongate body extends between the second proximal coupler and the second injection member, and with a second fluid passageway coupled to the second coupler and the second injection port. In another variation, the proximal coupler assembly includes a single common coupler that is fluidly coupled to each of the first and second injection ports via a common fluid passageway. According to one feature that may be employed per this variation, an elongate body extends between the single common coupler and the first and second injection members. The elongate body has at least one delivery passageway fluidly coupled to the single common coupler and also to the first and second injection ports.
According to still a further mode of this aspect of the invention, the system further includes a source of fluid agent that is adapted to be coupled to the local injection assembly. The fluid agent may comprises one, or combinations of, the following: saline; a diuretic, such as Furosemide or Thiazide; a vasopressor, such as Dopamine; a vasodilator; another vasoactive agent; Papaverine; a Calcium-channel blocker; Nifedipine; Verapamil; fenoldapam mesylate; a dopamine DA1 agonist; or analogs or derivatives, or combinations or blends, thereof.
Another mode includes a vascular access system with an elongate tubular body with at least one lumen extending between a proximal port assembly and a distal port that is adapted to be positioned within a vessel having translumenal access to the location. The system per this mode also includes a percutaneous translumenal interventional device that is adapted to be delivered to an intervention location across the location while the local injection assembly is at the location. The local injection assembly and percutaneous translumenal interventional device are adapted to be delivered percutaneously to the location and intervention location, respectively, through the vascular access device, and are also adapted to be simultaneously engaged within the vascular access device.
In one embodiment, the percutaneous translumenal interventional device comprises an angiographic catheter. In another, the percutaneous translumenal interventional device is a guiding catheter. In another regard, the interventional device may be between about 4 French and about 8 French.
In another embodiment, the proximal port assembly includes first and second proximal ports. The percutaneous translumenal interventional device is adapted to be inserted into the elongate body through the first proximal port. The first and second ports of the injection assembly are adapted to be inserted into the elongate body through the second proximal port.
Another aspect is a local infusion system for locally delivering a volume of fluid agent from a source located externally of a patient and into a location within a body space of a patient. This system includes a delivery member with a proximal end location and a distal end location with a longitudinal axis, and a local injection assembly comprising first and second injection members with first and second injection ports, respectively. The local injection assembly extends from the distal end location of the delivery member and is adjustable between a first configuration and a second configuration as follows. The local injection assembly in the first configuration is adapted to be delivered by the delivery member to the location. The local injection assembly at the location is adjustable from the first configuration to the second configuration such that the first and second first injection members are radially extended from the longitudinal axis with the first and second injection ports located at first and second relatively unique positions, respectively, at the location. The first and second injection ports at the first and second respective positions are adapted to be fluidly coupled to a source of fluid agent externally of the patient and to inject a volume of fluid agent into the patient at the first and second positions, also respectively, at the location.
Another aspect of the invention is a local renal infusion system for treating a renal system in a patient from a location within the abdominal aorta associated with abdominal aortic blood flow into first and second renal arteries via respective first and second renal ostia having unique relative locations along the abdominal aorta wall. This system includes in one regard a delivery catheter with an elongate body having a proximal end location, a distal end location with a distal tip that is adapted to be delivered across the location and to a delivery location that is upstream of the location while the proximal end location is located externally of the patient, and a delivery lumen extending between a proximal port along the proximal end location and a distal port along the distal end location. A local injection assembly is also provided with an injection port. The local injection assembly is adapted to be delivered at least in part by the elongate body to the location such that the injection port is at a position within the location while the distal tip of the delivery catheter is at the delivery position. The injection port at the location is adapted to be fluidly coupled to a source of fluid agent located externally of the patient and to inject a volume of fluid agent from the source into abdominal aorta at the location such that the injected volume flows substantially into the first and second arteries via the first and second renal ostia, respectively.
A further aspect of the invention is a catheter for locally delivering fluid agent to the renal arteries of a patient and accommodating a medical intervention device with the catheter having a proximal end location, a mid distal location, and a distal end location and the catheter further having a central lumen and at least one outer lumen. A local injection assembly has at least one tube, wherein each tube is inserted into a corresponding outer lumen. Each tube has a proximal end location and a distal end location wherein the distal end location of each tube is coupled to the distal end location of the catheter. The local injection assembly has at least a first injection port, the injection port positioned on at least one tube between the distal end location of the tube and the mid distal location of the catheter. A fluid agent source is fluidly connected to the proximal end location of at least one tube with an injection port. Each tube is adjustable between a first position and a second position; wherein in the first position, each tube is configured to be delivered to a location within an abdominal aorta associated with a blood stream flowing into a plurality of renal artery ostia and wherein in the second position, each tube is configured to be anchored at the location and the injection port is positioned to deliver fluid agent from the fluid agent source into the blood stream. Also in the second position, the central lumen is adapted to provide a passageway from the proximal end location to the distal end location of the catheter to accommodate a medical intervention device.
In another mode of this aspect, the injection assembly has at least a second tube and at least a second injection port in the second tube.
In a further mode of this aspect, the injection assembly has at least a third tube and in a still further mode, the injection assembly has at least a fourth tube.
In a still further mode, the catheter has a longitudinal axis and the first and second tubes in the first configuration have first radial positions relative to the longitudinal axis while the first and second tubes in the second configuration have second radial positions that are radially extended from the longitudinal axis relative to the first radial position.
In another mode, the first and second tubes are located on opposite respective sides of the catheter around a circumference of the catheter.
In a further mode, each of the first and second tubes extends between the mid distal location and the distal location on each of the opposite respective sides of the catheter, and in the second configuration, the first and second tubes are biased outward from the catheter between the respective mid distal location and distal location of the catheter.
In a still further mode, first and second markers are located along the first and second tubes, respectively, at locations generally corresponding with the first and second injection ports. Each of the first and second markers is adapted to indicate to an operator externally of the patient the locations of the first and second injection ports to assist their delivery to the first and second positions, respectively.
In an embodiment of the aforementioned mode, the first and second markers are radiopaque markers.
In another mode of the invention, the first position is a memory shape for each tube and each tube is adjusted from the first position to the second position by applying an advancing force to the proximal end location of each tube in a distal direction. Further, each tube is self-adjustable from the second position to the first position with a memory recovery force upon removal of the advancing force.
Another aspect of the invention is a method for treating a renal system in a patient from a location within the abdominal aorta associated with abdominal aortic blood flow into first and second renal arteries via respective first and second renal ostia having unique relative locations along the abdominal aorta wall and performing medical intervention. This method includes in one regard delivering a delivery catheter with an elongate body and a central lumen having a proximal end location and a distal end location with a distal tip across the location and to a delivery location that is upstream of the location while the proximal end location is located externally of the patient. The method further includes delivering a local injection assembly that includes an injection port at least in part by the elongate body to the location such that the injection port is at a position within the location while the distal tip of the delivery catheter is at the delivery position. The injection port at the location is fluidly coupled to a source of fluid agent located externally of the patient. A volume of fluid agent from the source is injected through the injection port and into abdominal aorta at the location such that the injected volume flows substantially into the first and second arteries via the first and second renal ostia, respectively. Medical intervention is performed through the central lumen.
Another aspect of the invention is a method for treating a renal system in a patient from a location within the abdominal aorta associated with abdominal aortic blood flow into first and second renal arteries via their respective first and second renal ostia, respectively, at unique respective locations along the abdominal aorta wall. This method includes: positioning a local injection assembly at the location with first and second injection ports at first and second unique respective positions at the location. Also includes is fluidly coupling the local injection assembly at the location to a source of fluid agent externally of the patient. A further step includes simultaneously injecting a volume of fluid agent from the source through the first and second injection ports at the first and second positions and principally into the first and second renal arteries, respectively.
Another aspect of the invention is a method for treating a renal system in a patient from a location within the abdominal aorta associated with abdominal aortic blood flow into each of first and second renal arteries via first and second renal ostia, respectively, at unique respective locations along the abdominal aorta wall. This method includes positioning a local injection assembly at the location, and fluidly coupling to the local injection assembly at the location to a source of fluid agent externally of the patient. Also included is injecting a volume of fluid agent from the source and into the abdominal aorta at the location in a manner such that the injected fluid flows principally into the first and second renal arteries via the first and second renal ostia, respectively, and without substantially altering, occluding or isolating a substantial location of an outer region of aortic blood flow along a circumference of the abdominal aorta wall and across the location.
Another aspect of the invention is a method for treating a renal system in a patient from a location within the abdominal aorta associated with abdominal aortic blood flow into each of first and second renal arteries via first and second renal ostia, respectively, at unique respective locations along the abdominal aorta wall and performing medical intervention. This method aspect includes positioning a delivery member with a central lumen within an abdominal aorta of a patient, and delivering with the delivery member a local injection assembly having first and second injection members with first and second injection ports, respectively, in a first configuration to the location. Also included is adjusting the local injection assembly between the first configuration and a second configuration at the location. Further to this method, in the second configuration the local injection assembly extends from the distal end location of the delivery member with the first and second first injection members radially extended relative to each other across a location of the abdominal aorta at the location and with the first and second injection ports located at first and second relatively unique positions, respectively, at the location. A further mode of this aspect is fluidly coupling the first and second injection ports at the first and second respective positions to a source of fluid agent externally of the patient, and injecting a volume of fluid agent into the first and second renal arteries via their respective first and second renal ostia from the first and second positions, respectively. A still further mode is performing medical intervention through the central lumen.
Another aspect of the invention is a method for providing local therapy to a renal system in a patient from a location within the abdominal aorta associated with first and second flow paths within an outer region of abdominal aortic blood flow generally along the abdominal aorta wall and into first and second renal arteries, respectively, via their corresponding first and second renal ostia along an abdominal aorta wall in the patient. This method includes positioning a local injection assembly with a central lumen at the location with first and second injection ports at first and second respective positions, respectively, corresponding with the first and second flow paths. Also included is fluidly coupling the local injection assembly to a source of fluid agent externally of the patient when the local injection assembly is positioned at the location, and injecting a volume of fluid agent from the source, through the first and second injection ports at the first and second positions, respectively, and bilaterally into the first and second renal arteries, also respectively, via the respective corresponding first and second renal ostia without substantially occluding, isolating or altering abdominal aorta flow along the location.
Another aspect of the invention is a method for making a local renal infusion system with coronary access for treating a renal system in a patient from a location within the abdominal aorta. This method includes providing a elongated member having a central lumen and at least two outer lumens. The elongated member has a mid distal location, a distal end location, and a longitudinal axis. Each of the outer lumens has an outer wall in the elongated member. A slit of a predetermined length is made in the outer wall of each of the outer lumens parallel to the longitudinal axis of the elongated member and extending from the distal end location of the elongated member to the mid distal location of the elongated member. Single tubes to correspond with the number of outer lumens are provided where each single tube has a proximal end and a distal end. The single tubes are inserted into the corresponding outer lumens in the elongated member. The distal end of each single tube is coupled to the distal end location of the elongated member. An injection port is provided in at least two single tubes. The injection ports are positioned between the distal end of the respective single tube and the mid distal location of the elongated member. The injection ports are fluidly coupled to a source of fluid agent at the proximal end of the respective single tubes.
Further modes of these various method aspects include beneficially enhancing renal function with the injected volume of fluid agent. This may include in particular injecting the volume of fluid agent into the location while performing an interventional procedure at an intervention location within a vasculature of the patient. In one embodiment, this further includes injecting the volume of fluid agent during a period when a volume of radiocontrast dye injection is within the patient's vasculature, and such that the fluid agent is adapted to substantially prevent RCN in response to the radiocontrast dye injection. According to a further beneficial variation, the method includes treating acute renal failure with the injected volume of fluid agent.
Whereas each of these aspects, modes, embodiments, variations, and features is considered independently beneficial and are not to be required in combination with the others, nevertheless the various combinations and sub-combinations thereof as would be apparent to one of ordinary skill are further considered within the intended scope as further independently beneficial aspects of the invention.
Further aspects of the invention will be brought out in the following portions of the specification, wherein the detailed description is for the purpose of fully disclosing preferred embodiments of the invention without placing limitations thereon.
The invention will be more fully understood by reference to the following drawings which are for illustrative purposes only:
Referring more specifically to the drawings, for illustrative purposes the present invention is embodied in the apparatus generally shown in
The description herein provided relates to medical material delivery systems and methods in the context of their relationship in use within a patient's anatomy. Accordingly, for the purpose of providing a clear understanding, the term proximal should be understood to mean locations on a system or device relatively closer to the operator during use, and the term distal should be understood to mean locations relatively further away from the operator during use of a system or device. These present embodiments below therefore generally relate to local renal drug delivery generally from the aorta; however, it is contemplated that these systems and methods may be suitably modified for use in other anatomical regions and for other medical conditions without departing from the broad scope of various of the aspects illustrated by the embodiments.
In general, the disclosed material delivery systems will include a fluid delivery assembly, a proximal coupler assembly and one or more elongated bodies, such as tubes or catheters. These elongated bodies may contain one or more lumens and generally consist of a proximal region, a mid-distal region, and a distal tip region. The distal tip region will typically have means for delivering a material such as a fluid agent. Radiopaque markers or other devices may be coupled to the specific regions of the elongated body to assist introduction and positioning.
The material delivery system is intended to be placed into position by a physician, typically either an interventionalist (cardiologist or radiologist) or an intensivist, a physician who specializes in the treatment of intensive-care patients. The physician will gain access to a femoral artery in the patient's groin, typically using a Seldinger technique of percutaneous vessel access or other conventional method.
For additional understanding, further more detailed examples of other systems and methods for providing local renal drug delivery are variously disclosed in the following published references: WO 00/41612 to Keren et al.; and WO 01/083016 to Keren et al. The disclosures of these references are herein incorporated in their entirety by reference thereto. Moreover, various combinations with, or modifications according to, various aspects of the present embodiments as would be apparent to one of ordinary skill upon review of this disclosure together with these references are also considered within the scope of invention as described by the various independently beneficial embodiments described below.
The invention is also related to subject matter disclosed in other Published International Patent Applications as follows: WO 00/41612 to Libra Medical Systems, published Jul. 20, 2000; and WO 01/83016 to Libra Medical Systems, published Nov. 8, 2001. The disclosures of these Published International Patent Applications are also herein incorporated in their entirety by reference thereto.
Referring initially to
Conversely, the flow stream along an inner wall 34 of the abdominal aorta 10, as indicated by dashed box 36 and dashed box 38, contains a natural laminar flow stream into the branching arteries, e.g., the renal arteries 12, 14, as indicated by arrows 40, 42. In general, the flow stream 32 is of a higher velocity than flow stream 40 along wall 34 of aorta 10. It is to be understood that near the boundaries of dashed box 36, 38 with dashed box 30 the flow stream can contain flow streams into the branching arteries 12, 14—as well as down the abdominal aorta 10.
Further, the ostia of renal arteries 12, 14 are positioned to receive substantial blood flow from the blood flow near the posterior wall 34 of aorta 10 as well as the side walls. In other words, blood flow 40 in dashed boxes 36, 38 together is greater than blood flow 32 in dashed box 30 when along the posterior wall of aorta 10 relative to blood flow in the center of aorta 10 as shown in
Accordingly, in order to maximize the flow of a drug solution into the renal arteries using the natural flow patterns shown in
As described in much greater detail below, it is beneficial to infuse a drug solution above the renal arteries 12, 14 at two locations along the wall 34 of the abdominal aorta 10 spaced approximately one-hundred and eighty degrees (180) apart from each other.
Referring now to
It is to be understood that one or more additional struts or tubes (not shown) may be added to catheter 100 to position or stabilize the infusion tubes 104, 106 near the renal arteries. It is further understood that the additional struts may be made of different materials than the infusion tubes 104, 106.
In a beneficial embodiment, the drug infusion catheter 100 is used in lieu of the standard catheter introducer sheath, and its distal tip is placed at a level slightly above the renals, preferably at or below the level of the superior mesenteric artery (SMA). The drug desired to be infused selectively into the renal arteries is infused through the drug infusion catheter 100 while the coronary procedure is performed. This is a marked improvement over systemic infusion of a drug solution since the flow to the renal arteries 12, 14 is about 30 percent of total aortic blood flow.
Referring now to
As shown, each collapsible strut 160, 162 includes an infusion port 166. Further, each collapsible strut 160, 162 includes a first marker band 168 above the infusion port 166 and a second marker band 170 below the infusion port 166. Preferably, each marker band is radio-opaque to assist in positioning the drug infusion catheter 150 within the abdominal aorta 10.
Referring briefly to
In the expanded configuration, the infusion ports 216 are positioned immediately adjacent to the renal arteries 12, 14 and can release a drug solution directly into the renal arteries 12, 14. It can be appreciated that the drug infusion catheter 200 can be placed so that the drug solution is infused immediately above the renal arteries 12, 14 along the wall 34 of the abdominal aorta 10. After a specified dwell time within the abdominal aorta 10, the drug infusion catheter 200 can be returned to the collapsed configuration and withdrawn from the abdominal aorta 10.
Referring to
It can be appreciated that the drug infusion catheter 300 shown in
The present embodiment recognizes that experimental observations have shown that a drug solution can flow into the renal arteries 12, 14 naturally, provided the drug infusion is undertaken above the renal arteries 12, 14 and above or closely adjacent to the posterior aspect of the inner wall 34 of the abdominal aorta 10. The positioning loops 306, 308 can easily position the central catheter tube 302 against the posterior of the inner wall 34 of the abdominal aorta 10 and does not require a flow diverter, e.g., a balloon or membrane, to maximize drug infusion to the renal arteries 12, 14. As such, the possibility of thrombus formation due to the disruption of blood flow is minimized.
It can be appreciated that the drug infusion catheter 300 can easily allow various guide catheters and guide wires to pass alongside catheter tube 302 and between positioning loops 306, 308 and that passage can have minimal effect on the tactile feedback or other performance aspects of the adjunctive catheters that are typically used in a percutaneous coronary intervention (PCI).
In
A hemostasis valve 536 is attached at main port 518 and a Touhy Borst valve 538 is attached at secondary branch port 532. An intervention catheter 540 is introduced into the Y hub 510 through hemostasis valve 536. A multilumen fluid infusion catheter 542, similar to that shown in
In
In one embodiment, the distal end 546 of fluid infusion catheter 542 is a truncated cone shape (not shown). In one mode of this embodiment, fluid infusion catheter 542 is adapted to accommodate a dilator. In another embodiment one or more radiopaque marker bands (not shown) are attached at the distal end 546 of fluid infusion catheter 542. In a further embodiment one or more radiopaque marker bands (not shown) are attached to positioning tubes 550 and/or infusion tubes 552. In a still further embodiment, infusion tubes 552 and/or positioning tubes 550 are used to position the distal end 546 of catheter 542 without fluid infusion.
In another embodiment, fluid infusion catheter 542 is introduced into the vascular system through an introducer sheath (not shown). By way of example and not of limitation, proximal coupler system 500 may be adapted to advance a wide mix of medical devices such as guide wires, diagnostic catheters, flow diverters and infusion assemblies through fluid infusion catheter 542 and into a vascular system such as aorta system 10. A multiple Y proximal coupler (not shown), with two or more branch ports, can be used to control multiple positioning tubes and infusion tubes or advance multiple medical devices.
It is to be understood that each of the embodiments described in detail above provide a device that can be used for selective therapeutic drug infusion at sites remote to a primary treatment site. These devices can be applicable to interventional radiology procedures, including interventional diagnostic and therapeutic procedures involving the coronary arteries. Further, each of the devices described above, can be beneficial for delivering certain drugs, e.g., papaverine; Nifedipine; Verapamil; fenoldopam mesylate; Furosamide; Thiazide; and Dopamine; or analogs, derivatives, combinations, or blends thereof, to the renal arteries of a patient who is simultaneously undergoing a coronary intervention with the-intent of increasing the kidney's ability to process of organically-bound iodine, i.e., radiographic contrast, as measured by serum creatinine and glomerular filtration rate (GFR).
The various embodiments herein described for the present invention can be useful in treatments and therapies directed at the kidneys such as the prevention of radiocontrast nephropathy (RCN) from diagnostic treatments using iodinated contrast materials. As a prophylactic treatment method for patients undergoing interventional procedures that have been identified as being at elevated risk for developing RCN, a series of treatment schemes have been developed based upon local therapeutic agent delivery to the kidneys. Among the agents identified for such treatment are normal saline (NS) and the vasodilators papaverine (PAP) and fenoldopam mesylate (FM).
The approved use for fenoldopam is for the in-hospital intravenous treatment of hypertension when rapid, but quickly reversible, blood pressure lowering is needed. Fenoldopam causes dose-dependent renal vasodilation at systemic doses as low as approximately 0.01 mcg/kg/min through approximately 0.5 mcg/kg/min IV and it increases blood flow both to the renal cortex and to the renal medulla. Due to this physiology, fenoldopam may be utilized for protection of the kidneys from ischemic insults such as high-risk surgical procedures and contrast nephropathy. Dosing from approximately 0.01 to approximately 3.2 mcg/kg/min is considered suitable for most applications of the present embodiments, or about 0.005 to about 1.6 mcg/kg/min per renal artery (or per kidney). As before, it is likely beneficial in many instances to pick a starting dose and titrate up or down as required to determine a patient's maximum tolerated systemic dose. Recent data, however, suggest that about 0.2 mcg/kg/min of fenoldopam has greater efficacy than about 0.1 mcg/kg/min in preventing contrast nephropathy and this dose is preferred.
The dose level of normal saline delivered bilaterally to the renal arteries may be set empirically, or beneficially customized such that it is determined by titration. The catheter or infusion pump design may provide practical limitations to the amount of fluid that can be delivered; however, it would be desired to give as much as possible, and is contemplated that levels up to about 2 liters per hour (about 25 cc/kg/hr in an average about 180 lb patient) or about one liter or 12.5 cc/kg per hour per kidney may be beneficial.
Local dosing of papaverine of up to about 4 mg/min through the bilateral catheter, or up to about 2 mg/min has been demonstrated safety in animal studies, and local renal doses to the catheter of about 2 mg/min and about 3 mg/min have been shown to increase renal blood flow rates in human subjects, or about 1 mg/min to about 1.5 mg/min per artery or kidney. It is thus believed that local bilateral renal delivery of papaverine will help to reduce the risk of RCN in patients with pre-existing risk factors such as high baseline serum creatinine, diabetes mellitus, or other demonstration of compromised kidney function.
It is also contemplated according to further embodiments that a very low, systemic dose of papaverine may be given, either alone or in conjunction with other medical management such as for example saline loading, prior to the anticipated contrast insult. Such a dose may be on the order for example of between about 3 to about 14 mg/hr (based on bolus indications of approximately 10-40 mg about every 3 hours—papaverine is not generally dosed by weight). In an alternative embodiment, a dosing of 2-3 mg/min or 120-180 mg/hr. Again, in the context of local bilateral delivery, these are considered halved regarding the dose rates for each artery itself.
Notwithstanding the particular benefit of this dosing range for each of the aforementioned compounds, it is also believed that higher doses delivered locally would be safe. Titration is a further mechanism believed to provide the ability to test for tolerance to higher doses. In addition, it is contemplated that the described therapeutic doses can be delivered alone or in conjunction with systemic treatments such as intravenous saline.
From the foregoing discussion, it will be appreciated that the various embodiments described herein generally provide for infusion of renal protective drugs into each of two renal arteries perfusing both kidneys in a patient. The devices and methods of these embodiments are useful in prophylaxis or treatment of kidney malfunction or conditions, such as for example ARF. Various drugs may be delivered via the systems and methods described, including for example: vasodilators; vasopressors; diuretics; Calcium-channel blockers; or dopamine DA1 agonists; or combinations or blends thereof. Further, more specific, examples of drugs that are contemplated in the overall systems and methods described include but are not limited to: Papaverine; Nifedipine; Verapamil; Fenoldapam; Furosamide; Thiazide; and Dopamine; or analogs, derivatives, combinations, or blends thereof.
It is to be understood that the invention can be practiced in other embodiments that may be highly beneficial and provide certain advantages. For example radiopaque markers are shown and described above for use with fluoroscopy to manipulate and position the introducer sheath and the intra aortic catheters. The required fluoroscopy equipment and auxiliary equipment devices are typically located in a specialized location limiting the in vivo use of the invention to that location. Other modalities for positioning intra aortic catheters are highly beneficial to overcome limitations of fluoroscopy. For example, non-fluoroscopy guided technology is highly beneficial for use in operating rooms, intensive care units, and emergency rooms, where fluoroscopy may not be readily available or its use may cause undue radiation exposure to users and others due to a lack of specific radiation safeguards normally present in angiography suites and the like. The use of non-fluoroscopy positioning allows intra aortic catheter systems and methods to be used to treat other diseases such as ATN and CHF in clinical settings outside of the angiography suite or catheter lab.
In one embodiment, the intra aortic catheter is modified to incorporate marker bands with metals that are visible with ultrasound technology. The ultrasonic sensors are placed outside the body surface to obtain a view. In one variation, a portable, noninvasive ultrasound instrument is placed on the surface of the body and moved around to locate the device and location of both renal ostia. This technology is used to view the aorta, both renal ostia and the intra aortic catheter.
In another beneficial embodiment, ultrasound sensors are placed on the introducer sheath and the intra aortic catheter itself; specifically the tip of the aortic catheter or at a proximal section of the catheter. The intra aorta catheter with the ultrasonic sensors implemented allows the physician to move the sensors up and down the aorta to locate both renal ostia.
A further embodiment incorporates Doppler ultrasonography with the intra aortic catheters. Doppler ultrasonography detects the direction, velocity, and turbulence of blood flow. Since the renal arteries are isolated along the aorta, the resulting velocity and turbulence is used to locate both renal ostia. A further advantage of Doppler ultrasonography is it is non-invasive and uses no x rays.
A still further embodiment incorporates optical technology with the intra aorta catheter. An optical sensor is placed at the tip of the introducer sheath. The introducer sheath's optical sensor allows visualization of the area around the tip of the introducer sheath to locate the renal ostia. In a further mode of this embodiment, a transparent balloon is positioned around the distal tip of the introducer sheath. The balloon is inflated to allow optical visual confirmation of renal ostium. The balloon allows for distance between the tip of the introducer sheath and optic sensor while separating aorta blood flow. That distance enhances the ability to visualize the image within the aorta. In a further mode, the balloon is adapted to allow profusion through the balloon wall while maintaining contact with the aorta wall. An advantage of allowing wall contact is the balloon can be inflated near the renal ostium to be visually seen with the optic sensor. In another mode, the optic sensor is placed at the distal tips of the intra aortic catheter. Once the intra aortic catheter is deployed within the aorta, the optic sensor allows visual confirmation of the walls of the aorta. The intra aortic catheter is tracked up and down the aorta until visual confirmation of the renal ostia is found. With the optic image provided by this mode, the physician can then track the positioning of the intra aortic catheter to the renal arteries.
Another embodiment uses sensors that measure pressure, velocity, and/or flow rate to locate renal ostia without the requirement of fluoroscopy equipment. The sensors are positioned at the distal end of the intra aortic catheter. The sensors display real time data about the pressure, velocity, and/or flow rate. With the real-time data provided, the physician locates both renal ostia by observing the sensor data when the intra aortic catheter is around the approximate location of the renal ostia. In a further mode of this embodiment, the intra aortic catheter has multiple sensors positioned at a mid distal and a mid proximal position on the catheter to obtain mid proximal and mid distal sensor data. From this real time data, the physician can observe a significant flow rate differential above and below the renal arteries and locate the approximate location. With the renal arteries being the only significant sized vessels within the region, the sensors would detect significant changes in any of the sensor parameters.
In a still further embodiment, chemical sensors are positioned on the intra aortic catheter to detect any change in blood chemistry that indicates to the physician the location of the renal ostia. Chemical sensors are positioned at multiple locations on the intra aortic catheter to detect chemical change from one sensor location to another.
Although the description above contains many details, these should not be construed as limiting the scope of the invention but as merely providing illustrations of some of the presently preferred embodiments of this invention. Therefore, it will be appreciated that the scope of the present invention fully encompasses other embodiments which may become obvious to those skilled in the art, and that the scope of the present invention is accordingly to be limited by nothing other than the appended claims, in which reference to an element in the singular is not intended to mean “one and only one” unless explicitly so stated, but rather “one or more.” All structural, chemical, and functional equivalents to the elements of the above-described preferred embodiment that are known to those of ordinary skill in the art are expressly incorporated herein by reference and are intended to be encompassed by the present claims. Moreover, it is not necessary for a device or method to address each and every problem sought to be solved by the present invention, for it to be encompassed by the present claims. Furthermore, no element, component, or method step in the present disclosure is intended to be dedicated to the public regardless of whether the element, component, or method step is explicitly recited in the claims. No claim element herein is to be construed under the provisions of 35 U.S.C. 112, sixth paragraph, unless the element is expressly recited using the phrase “means for.”
This application claims priority from U.S. provisional application Ser. No. 60/508,751 filed on Oct. 2, 2003, incorporated herein by reference in its entirety. This application claims priority from, and is a continuation-in-part of, PCT International Application Serial No. PCT/US2003/029995 filed on Sep. 22, 2003, which designates the U.S., incorporated herein by reference in its entirety. This application claims priority to U.S. provisional application 60/502,389 filed on Sep. 13, 2003, incorporated herein by reference in its entirety. This application claims priority from U.S. provisional application Ser. No. 60/479,329 filed on Jun. 17, 2003, incorporated herein by reference in its entirety. This application claims priority from U.S. provisional application Ser. No. 60/412,343 filed on Sep. 20, 2002, incorporated herein by reference in its entirety. This application claims priority from U.S. provisional application Ser. No. 60/412,476 filed on Sep. 20, 2002, incorporated herein by reference in its entirety.
| Number | Date | Country | |
|---|---|---|---|
| 60508751 | Oct 2003 | US | |
| 60502389 | Sep 2003 | US | |
| 60479329 | Jun 2003 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | PCT/US04/08571 | Mar 2004 | US |
| Child | 11303554 | Dec 2005 | US |
