Intravascular blood filters and methods of use

Abstract

Multi-filter endolumenal methods and systems for filtering fluids within the body. In some embodiments a multi-filter blood filtering system captures and removes particulates dislodge or generated during a surgical procedure and circulating in a patient's vasculature. In some embodiments a dual filter system protects the cerebral vasculature during a cardiac valve repair or replacement procedure.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation-in-part of U.S. application Ser. No. 12 / 689,997, filed Jan. 19, 2010, which claims the benefit of U.S. Provisional Patent Application No. 61 / 145,149, filed Jan. 16, 2009, both of which are incorporated herein by reference. This application also claims the benefit of U.S. Provisional Application No. 61 / 244,418, filed Sep. 21, 2009; U.S. Provisional Application No. 61 / 334,893, filed May 14, 2010; and U.S. Provisional Application No. 61 / 348,979, filed May 27, 2010, all of which are incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]Thromboembolic disorders, such as stroke, pulmonary embolism, peripheral thrombosis, atherosclerosis, and the like, affect many people. These disorders are a major cause of morbidity and mortality in the United States and throughout the world. Thromboembolic events are characterized by an occlusion of a blood vessel. The occlusion can be caused by a clot which is v...

AI Technical Summary

Benefits of technology

[0014]One aspect of the disclosure is a catheter-based endovascular system and method of use for filtering blood that captures and removes particles caused as a result of a surgical or endovascular procedures. The method and system include a first filter placed in a first vessel within the patient's vascular system and a second filter placed in a second vessel within the patient's vascular system. In this manner, the level of particulate protection is thereby increased.

[0015]One aspect of the disclosure is an endovascular filtration system and method of filtering blood that protects the cerebral vasculature from embolisms instigated or foreign bodies dislodged during a surgical procedure. In this aspect, the catheter-based filtration system is disposed at a location in the patient's arterial system between the site of the surgical procedure and the cerebral vasculature. The catheter-based filtration system is inserted and deployed at the site to capture embolisms and other foreign bodies and prevent their travel to the patient's cerebral vasculature so as to avoid or minimize thromboembolic disorders such as a stroke.

Problems solved by technology

These disorders are a major cause of morbidity and mortality in the United States and throughout the world.

When an artery is occluded by a clot, tissue ischemia (lack of oxygen and nutrients) develops.

Failure to reestablish blood-flow can lead to the loss of limb, angina pectoris, myocardial infarction, stroke, or even death.

Occlusion of the venous circulation by thrombi leads to blood stasis which can cause numerous problems.

While such surgical techniques have been useful, exposing a patient to surgery may be traumatic and is best avoided when possible.

Additionally, the use of a Fogarty catheter may be problematic due to the possible risk of damaging the interior lining of the vessel as the catheter is being withdrawn.

Balloon angioplasty is appropriate for treating vessel stenosis but is generally not effective for treating acute thromboembolisms.

Unfortunately, thrombolysis typically takes hours or days to be successful.

Additionally, thrombolytic agents can cause hemorrhage and in many patients the agents cannot be used at all.

Another problematic area is the removal of foreign bodies.

The use of such removal devices can be difficult and sometimes unsuccessful.

Moreover, systems heretofore disclosed in the art are generally limited by size compatibility and the increase in vessel size as the emboli is drawn out from the distal vascular occlusion location to a more proximal location near the heart.

If the embolectomy device is too large for the vessel it will not deploy correctly to capture the clot or foreign body, and if too small in diameter it cannot capture clots or foreign bodies across the entire cross section of the blood vessel.

Additionally, if the embolectomy device is too small in retaining volume then as the device is retracted the excess material being removed can spill out and be carried by flow back to occlude another vessel downstream.

Such devices, however, have been found to have structures which are either highly complex or lacking in sufficient retaining structure.

Disadvantages associated with the devices having highly complex structure include difficulty in manufacturability as well as difficulty in use in conjunction with microcatheters.

Additionally, due to difficult-to-access anatomy such as the cerebral vasculature and the neurovasculature, the systems should have a small collapsed profile.

The risk of dislodging foreign bodies is also prevalent in certain surgical procedures.

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