| 摘要 |
In a forceps device for use with an endoscope, two jaws are displaceable towards and away from one another for engagement and separation of a portion of tissue during a closing movement of the jaws. The jaws are formed from a resilient material at one axial end of an inner sleeve received within an outer sleeve. The jaws are biassed into a normally open configuration, which they take up when inner sleeve is axially extended outwardly from outer sleeve. Closure of the jaws is brought about by withdrawing inner sleeve axially into outer sleeve. A portion of tissue separated by the jaws is withdrawn to a retaining disposition within the device past barbs or spikes extending radially inwardly into the interior of the inner sleeve from the inner face of outer sleeve through axially extending slots in the inner sleeve in the jaw region. Once a portion of tissue has been withdrawn behind these barbs, the tissue is held by the barbs when the inner sleeve is again extended axially forward to project from the end of outer sleeve. In this manner, a succession of tissue samples may be taken for a single insertion of the forceps device into the body of a patient, the successive samples being retained within the inner sleeve. Each new sample is withdrawn past the barbs and pushes previous samples farther into the sleeve. The succession of samples is held within sleeve until the device is withdrawn from within the patient's body, at which time all of the samples may be removed from the inner sleeve, such as by blowing them out again using air pressure, for subsequent analysis. The forceps device may be provided as a disposable unit and the invention also extends to further constructions of disposable and multiple-sample endoscopic forceps. |
