Patent ID: 9649035
Date: 2017-05-16
CPC Classifications: A61B,A61M

Claim:
1. A method of treating comprising: inserting an introducer into a first blood vessel of a patient, the introducer comprising a dilator positioned inside a selected sheath which possesses open distal and proximal ends, the dilator comprising a distal end, the introducer being inserted into the first blood vessel while the distal end of the dilator extends distally beyond the distal end of the selected sheath, the selected sheath comprising an outer diameter substantially equal to an outer diameter of a first sheath and an inner diameter substantially equal to an inner diameter of a second sheath which has a Fr size that is one Fr size larger than a Fr size of the first sheath; drawing out the dilator from the first blood vessel and from the selected sheath while the selected sheath is kept indwelled in the first blood vessel; inserting a diagnostic instrument into the selected sheath that is indwelled in the first blood vessel, through the first blood-vessel and into a second blood vessel, the diagnostic instrument having an outer diameter inserted into the selected sheath that is smaller than a maximum outer diameter which can be inserted into and moved along the selected sheath; diagnosing, through use of the diagnostic instrument, whether a stenosis exists in the second blood vessel; drawing out the diagnostic instrument from the second blood vessel, the first blood vessel and the selected sheath; inserting a therapeutic instrument or a catheter permitting insertion of the therapeutic instrument, through the selected sheath that is indwelled in the first blood vessel so that the therapeutic instrument or the catheter is inserted through the first blood vessel and then into the second blood vessel, the therapeutic instrument or the catheter having the maximum outer diameter which is permitted to be inserted into the selected sheath and moved along the selected sheath, and when the catheter permitting insertion of the therapeutic instrument is inserted through the selected sheath and the first blood vessel and into the second blood vessel, the therapeutic instrument is inserted through the catheter and the first blood vessel and into the second blood vessel; and treating the stenosis in the second blood vessel through use of the therapeutic instrument, the first blood vessel being either a radial artery or a ulnar artery of the patient and the second blood vessel being a coronary artery of the patient.