Balloon for expanding an orifice

A balloon configured for expanding a foreskin, the balloon comprising:

• a hollow body having a head and a neck, the neck having a length and the body being closed at a distal end and open at a proximal end with a longitudinal axis extending therebetween, the body having an inner face and an outer face defining a wall thickness of the body, the head extending from the neck and terminating at the closed distal end, the closed distal end defined by a transverse end wall being that portion of the head which extends across the distal end of the body in a direction transverse to the longitudinal axis, the head having a sidewall portion being that portion of the head which is directly connected to extend between each of the transverse end wall and the neck;
• wherein a wall thickness of the neck is greater than a wall thickness of the sidewall portion of the head, and a wall thickness of the transverse end wall is greater than a wall thickness of the sidewall portion of the head, such that when the balloon is inflated the head expands in a radial direction greater than in a direction of the longitudinal axis and a diameter of an outer face of the neck remains approximately constant over the length of the neck during inflation, to thereby form the balloon with a bulbous mushroom shape, the bulbous mushroom head having an outer diameter greater than an outer diameter of the neck, the outer diameter of the neck being substantially cylindrical.