Vascular filtering device

• US 6,340,364 B2
• Filed: 01/26/2001
• Issued: 01/22/2002
• Est. Priority Date: 10/22/1999
• Status: Expired due to Fees

• Current Assignee: Nozomu Kanesaka
• Original Assignee: Nozomu Kanesaka
• Inventors: Kanesaka, Nozomu
• Primary Examiner(s): Jackson, Gary
• Application Number:
  US09/769,312
• Publication Number:
  US 20010007947A1
• Time in Patent Office: 361 Days
• Field of Search: 606/159, 606/198, 606/200, 604/96, 604/101
• US Class Current: 606/200
• CPC Class Codes: A61B 17/22032 having inflatable gripping elements balloon catheters A61M25/10
• CPC Class Codes: A61F 2/0105 Open ended, i.e. legs gathered only at one side
• CPC Class Codes: A61F 2002/068 Modifying the blood flow model, e.g. by diffuser or deflector
• CPC Class Codes: A61F 2230/0006 circular
• CPC Class Codes: A61F 2250/0003 having an inflatable pocket filled with fluid, e.g. liquid or gas

Abstract

A vascular filtering device is formed of a flexible shaft having a passageway extending inside the shaft, an inflatable member communicating with the passageway and having a spiral form, and a filter member fixed to the distal end portion of the shaft. The inflatable member is attached at an inner side thereof to a distal end portion of the shaft. The filter member is attached to the shaft and fixed onto the outer side surface of the inflatable member along the entire length thereof. When the inflatable member is inflated, the filter member is enlarged to allow a blood containing debris or blood clots to flow through the filter member. Thus, the debris or blood clots are captured by the filter member. When the inflatable member is deflated, the filter member is disposed close to the side surface of the shaft. Thus, the filter member with the debris or clots can be easily removed from the blood vessel.

Claims

1. A vascular filtering device, comprising:

a flexible shaft having a side surface, a passageway extending inside the flexible shaft, and a side opening formed in the side surface at a distal end portion of the shaft and communicating with the passageway,

an inflatable member having a spiral form and attached to the distal end portion of the shaft to communicate with the passageway through the side opening of the shaft, said inflatable member having an outer side surface, and an inner side surface entirely fixed to the side wall of the shaft, and

a filter member having a distal end sealingly fixed to the distal end portion of the shaft and an open end at a side opposite to the distal end thereof, said filter member extending along the flexible shaft and fixed onto the outer side surface of the inflatable member along an entire length thereof so that when the inflatable member is inflated, the filter member is enlarged to allow a foreign substance to enter into the filter member through the open end, and when the inflatable member is deflated, the filter member is disposed close to the side surface of the shaft.

2. A vascular filtering device according to claim 1, wherein said shaft is a guide shaft for allowing a vascular treatment device to be transferred in a blood vessel.

3. A vascular filtering device according to claim 1, wherein said filter member has a bag shape opening toward a proximal end portion of the shaft.

4. A vascular filtering device according to claim 1, wherein said inflatable member has a tubular shape with a hollow portion therein extending substantially throughout an entire length thereof, said hollow portion having a diameter gradually enlarging from the distal end of the shaft.

5. A vascular filtering device according to claim 1, wherein said shaft includes a partition wall therein, and a port in the side wall near the partition wall, said partition wall dividing the passageway into a first passageway extending from a proximal end portion of the shaft to the opening to communicate with the inflatable member, and a second passageway extending from the port to a distal end of the shaft to allow a guide wire to pass therethrough.