| 摘要 |
A deformation detector for use with IV needles or catheters inserted into the human body is disclosed. Swelling and deformation attributal to other sources is also detectable. The apparatus in particular has a preferred embodiment which comprises a generally rectangular body enclosing an air chamber. The chamber is rectangular and is open on one face thereof, a thin diaphragm is attached. The body has an encircling lip which is joined by a suitable adhesive to the body adjacent to a IV needle or catheter. In the event of swelling as a result of improper operation of the injection which swelling, while hardly visible to the eye, is detected by protrusion of the body into the chamber to increase air pressure in the chamber. Swelling or edema from other sources is similarly detectable. The swelling decreases the internal volume of the chamber and thereby forms a pneumatic signal supplied through a tubing to a transducer or recording device. This is used to form a signal of swelling or edema. |
