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US 9,808,332 B2Granted
Dynamic microvalve protection device
AssigneeSurefire Medical, Inc.
InventorsJames E. Chomas, Leonard Pinchuk, John Martin, Aravind Arepally, Brett E. Naglreiter, Bryan M. Pinchuk
Life of this patent
Estimating the term…
Abstract
An apparatus includes a delivery catheter having a deployable dynamic valve that dynamically opens and closes in response to relative fluid pressure thereabout, particularly while in an anatomical lumen. The valve is maintained in a collapsed configuration during introduction to a treatment site. The valve is adapted to automatically move from the collapsed configuration to a deployed configuration at the treatment site.
Claims19
An endovascular valve device for temporary use in a vessel during an intravascular procedure, comprising:
- a) a first catheter having a distal end, a lumen defining an inner diameter and terminating at a distal orifice, and an outer diameter;
- and
- b) a valve fixed to said distal end of said first catheter, said distal orifice opening into an interior of said valve, said valve having,
- i) a plurality of elongate first filaments in a braid, said first filaments having a proximal end, a distal end, and a length extending therebetween,
- said proximal ends of said first filaments secured relative to each other such that a central opening is provided between said secured proximal ends, said first filaments along said lengths distal of said proximal ends movable relative to each other,
- said first filaments fully collapsible relative to each other into an undeployed state, and expandable from said undeployed state into a radially-expanded deployed state by a spring bias of said first filaments, and
- ii) a polymeric filter coated onto said braid,
- wherein once said valve is in said deployed state in the vessel, said valve is dynamically movable between an expanded valve-open configuration and a collapsed valve-closed configuration depending on a local fluid pressure about said valve such that,
- when the fluid pressure is higher on a proximal side of said valve, the higher fluid pressure on said proximal side of said valve causes said valve to assume said valve-closed configuration in which said distal end of said valve assumes a first maximum diameter smaller than the diameter of the vessel such that fluid flow about the said valve and said filter is permitted, and
- when said fluid pressure is higher on a distal side of said valve, the higher fluid pressure on said distal side of said valve causes said valve to assume said valve-open configuration in which said distal end of said valve assumes a second maximum diameter relatively larger than said first maximum diameter and in which said valve is adapted to contact the vessel wall.
7 more elements
An endovascular valve device for temporary use in a vessel during an intravascular procedure, the device comprising:
- a) an elongated first catheter having a proximal end and a distal end, a lumen defining an inner diameter and terminating at a distal orifice, and an outer diameter;
- and
- b) a substantially frustoconical valve longitudinally fixed at said distal end of said first catheter such that said distal orifice opens into an interior of said valve, said valve having a housed state with a first smaller diameter and a radially-expanded deployed state with a second larger diameter, said second larger diameter being substantially larger than said outer diameter and capable of extending across a vessel through which said device is used, said valve comprising,
- i) a plurality of elongate first filaments in a braid, the braid expandable from an undeployed state into a radially-expanded deployed state by a spring bias of said first filaments, and
- ii) a filter comprising a polymeric coating on said braid, said filter defining a pore size not exceeding 500 μm,
- wherein once said valve is in said deployed state in the vessel, said valve is dynamically movable between an expanded valve-open configuration and a collapsed valve-closed configuration depending on a local fluid pressure about said valve,
- when the fluid pressure is higher on a proximal side of said valve, the higher fluid pressure on said proximal side of said valve causes said valve to assume said valve-closed configuration in which said distal end of said valve assumes a first maximum diameter smaller than the diameter of the vessel such that fluid flow about said valve and said filter is permitted, and
- when said fluid pressure is higher on a distal side of said valve, the higher fluid pressure on said distal side of said valve causes said valve to assume said valve-open configuration in which said distal end of said valve assumes a second maximum diameter relatively larger than said first maximum diameter and in which said valve is adapted to contact the vessel wall.
5 more elements
An endovascular valve device for temporary use in a vessel during an intravascular procedure, the device comprising:
- a) an elongated first catheter having a proximal end and a distal end, a lumen defining an inner diameter and a distal orifice, and an outer diameter;
- and
- b) a valve coupled at said distal end of said first catheter, said valve having a substantially frustoconical portion with a proximal portion and a distal portion, said proximal portion of said frustoconical portion coupled to said first catheter such that said distal orifice opens into an interior of said valve, said valve comprising,
- i) a plurality of elongate first filaments in a braid, the braid expandable from an undeployed state into a radially-expanded deployed state by a spring bias of said first filaments, and
- ii) a filter comprising a polymeric coating on said braid, said filter defining a pore size not exceeding 500 μm,
- wherein once said valve is in said deployed state in the vessel, said valve is dynamically movable between an expanded valve-open configuration and a collapsed valve-closed configuration depending on a local fluid pressure about said valve, wherein,
- when the fluid pressure is higher on a proximal side of said valve, the higher fluid pressure on said proximal side of said valve causes said valve to assume said valve-closed configuration in which said distal end of said valve assumes a first maximum diameter, and
- when said fluid pressure is higher on a distal side of said valve, the higher fluid pressure on said distal side of said valve causes said valve to assume said valve-open configuration in which said distal end of said valve assumes a second maximum diameter larger than the first maximum diameter.
5 more elements
Dependencies are inferred from the claim text.