Controlling flow in a medical injection system

摘要

A valve apparatus for a medical injection system includes a pinching member and at least one spring-loaded anvil. A tubing line of the injection system may be positioned between the pinching member and the anvil, such that when the pinching member is moved into a pinching position adjacent to the anvil, for example, by rotation of a shaft to which the member is coupled, the pinching member compresses the tubing line against the spring-loaded anvil. The pinching member is preferably rotatable about an auxiliary axis, which is eccentric, or offset from a central axis of the shaft. A spring member of the spring-loaded anvil is preferably pre-loaded. In certain applications, the pinching member, when moved into the pinching position, applies a pinching force of greater than approximately 45 pounds, for example, to prevent flow through the tubing line at an injection pressure of up to approximately 1200 psi.

主权项

1. A valve apparatus for controlling flow through a pair of tubing lines of a medical injection system, the apparatus comprising:
a rotatable shaft; a pinching member coupled to the rotatable shaft such that the pinching member moves around a central axis of the shaft when the shaft is rotated; a first anvil attached to a first spring member and located on a first side of the shaft; and a second anvil attached to a second spring member and located on a second side of the shaft, the second side being generally opposite the first side; wherein rotation of the shaft moves the pinching member from a first position, adjacent to the first anvil, to a second position, adjacent to the second anvil; and when the pinching member is in the first position, a minimum gap between the first anvil and the pinching member is less than twice a wall thickness of one of the pair of tubing lines, wherein each of the first and second spring members comprises an elongate flexure displaced parallel to the central axis of the shaft, each flexure having a fixed first end and a floating second end, each second end having the corresponding anvil attached thereto; further comprising a pair of pre-load supports, each pre-load support displaced between a corresponding fixed first end and a corresponding floating second end of the corresponding flexure for pre-loading thereof.