| 摘要 |
The present invention relates generally to improvements in inspection instruments or speculums used for dilating passages in the human body. And more particularly, to instruments of the above-mentioned type which may be plastic molded and hence produced at an extremely low cost. An embodiment of the invention disclosed herein comprises a pair of upper and lower pivotally coupled elongate jaw members and a handle section integral with each jaw member and extending generally laterally therefrom. A series of notches in one of the handle sections is adapted to interlock with lug means on the other handle section, said lug means being maintained in interlocking position as an incident to external pressures tending to close the jaw members.
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