MemokathR: A Second Generation of Intraprostatic Spirals

Summary— MemokathR(Engineers & Doctors A/S, Hornbæk, Denmark) is a new intraprostatic spiral composed of titanium nickel alloy with shape memory effect. We describe the use of this spiral in 30 consecutive patients with prostatic outflow obstruction. Their median age was 79 years and all were either in a high risk group for surgery or had refused surgery. The spiral was inserted under sterile conditions via a delivery catheter under ultrasonic guidance. When flushed with hot water (45°C or above) one section of the spiral expands in the prostatic apex and maintains the spiral in position. When cooled with cold water (10°C or below) the spiral becomes supersoft, making removal easy.