Patent ID: 11877939
Assignee: OTSUKA MEDICAL DEVICES CO., LTD.
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 0:
1. A stent configured to be inserted into a catheter and to be pushed out of the catheter to capture a blood clot in a blood vessel,
the stent comprising a structure configured to deploy while rotating when a portion of the stent is pushed out of the catheter while another portion of the stent is inserted in the catheter,
the stent having an expansive force of 0.05 N/mm or less per unit length when the stent has a diameter equal to a lower limit diameter of a target blood vessel and when the stent is measured
using, as a tester, a radial force testing system manufactured by Blockwise Engineering LLC,
using test conditions including
a temperature of 37° C.±2° C. in a chamber of the tester,
a stent diameter of 0.5 mm for start of test, and
a rate of increase of diameter of 0.5 mm/s in the tester, and
using a test method comprising:, setting a temperature in the chamber of the tester at 37° C.±2° C.;
placing whole of the stent in the chamber of the tester and radially contracting the stent until the stent has the diameter for the start of test;
recording an expansive force in a radial direction while gradually increasing a diameter of the chamber at the rate of increase of diameter in the tester; and
dividing the expansive force by an effective length of the stent to calculate an expansive force per unit length.