A holding device for use with an elongated flexible member and a tubular introducer member, the tubular introducer member being arranged to be extended into the body of a living being, with the elongated flexible member being arranged to be extended through the tubular introducer member into the being's body for location at a desired position, said holding device comprising:
- (A) a first portion and a second portion,
- (B) said first portion of said holding device being operable to grip a portion of the periphery of the elongated flexible member to hold the elongated flexible member at the desired position within the being's body, said second portion of said holding device being arranged to cause the tubular introducer member to separate longitudinally when the tubular introducer member is pulled proximally with respect to said holding device as said holding device grips the elongated flexible member, whereupon the tubular introducer member can be removed from the elongated flexible member leaving the elongated flexible member at the desired position within the being's body.