Abstract: A filter device includes: a shaft having an intermediate coil wire between a proximal filter wire and a distal filter wire; a proximal filter on the proximal filter wire; and a distal filter on the distal filter wire. The intermediate coil wire is disposed to extend between downstream and upstream blood vessels to pass through a path of placement that leads to another downstream blood vessel. Both the filters have a contracted configuration for being delivered into the blood vessel and an expanded configuration for capturing an embolus inside the blood vessel. The proximal filter is oriented such that an inlet opening, for taking in the embolus, of a proximal filter body in the expanded configuration faces the distal side, and the distal filter is oriented such that an inlet opening, for taking in the embolus, of a distal filter body in the expanded configuration faces the proximal side.

Abstract: A catheter apparatus has a catheter that is inserted into a lumen of the human body, a branch portion which is connected to a base end portion of the catheter and is provided with an insertion hole to pass a guide wire used in inserting the catheter in the lumen of the human body, and a liquid introducing portion for introducing liquid such as a drug solution into the catheter through a tube connected to the branch portion, where at a front end of the catheter is disposed embolus trapping part for trapping an embolus inside the lumen of the human body.

Abstract: To provide an embolic material excision trapping device capable of excising an embolic material in an arteriole or vessel without blocking the blood flow, and further, trapping the material with reliability. A device for removing an embolic material in a lumen in a living body has a long shaft member 1 having a front end and a base end and sending the front end to a distal end of the lumen, a filter member 5 which is provided on the front-end side of the shaft member 1, and contracts linearly inside a catheter for carrying the device while expanding when released into the lumen from the catheter, and a coil member 7 which is provided in the shaft member 1 on the side closer to the base-end side than the filter member 5, and contracts linearly inside the catheter while expanding spirally when released into the lumen from the catheter, where the coil member 7 destroys and traps an embolic material in the lumen, and the filter member 5 traps an liberated piece of the embolic material.