| 摘要 |
An improved injection molded plastic roller pinch clamp for IV sets includes a housing having side walls, a bottom wall, a top wall, a flow control region, a roller wheel and plastic tubing which is pinched between the roller wheel and the bottom wall. Methods for making the same and mold modifications to make the same are disclosed. A number of preferred dimensional relationships exist for achieving the easing of the effort required to adjust the wheel and consequent flow rate and obtaining a firm grip on the tube, while reducing the clamp weight. The ratio of the cross-sectional thickness of the top wall to the side wall is in the range of 1.3 to 4.0; the housing having a weight to length ratio in the range of 0.2 to 0.48 grams per centimeter (normalized range of 0.17 to 0.39), the side wall being between 1.1 and 2.3 times the thickness of the walls of the tubing. The housing is formed by a mold which may be easily modified from a prior mold to provide a wall thickness which is less than two thirds of the thickness of the upper wheel guide section. Methods for modifying molds having two cavity halves are also discussed, including processing the cavity halves to bring them closer by an amount equal to 20 percent to 70 percent of the original molded part.
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