| 摘要 |
A selectively aspirating stylet assembly comprises a stylet having proximal and distal ends, the proximal end in fluid communication with a fluid supply and the distal end disposed at or near the end of a catheter, cannula or other generally tubular member that is to be inserted to a specified location within a patient's body, so as to create a fluid flow path from the fluid supply through the generally tubular member to the specified location. A valve assembly located within the fluid flow path is operable to close off a fluid column within the stylet assembly to facilitate placement of the tubular member within the body, and to control the flow of fluids within the assembly. Insertion o f the tubular member into the body is accomplished by placing a portion of the stylet within the tubul ar member, closing the valve assembly to create a closed fluid column; inserting the style/tubular member assembly into the body; and then, during the withdrawal of the stylet, opening or closing the valve assembly as necessary to control the flow of fluid within the style/tubular member assembly to avoid substantial aspiration of body fluid and tissue.
|
