f *45 3 
one ferves to keep the Legs clofc during the time it 
is to be introduced into the Bladder, the other to 
extend the Points at the Diftance of an Inch or more, 
during the time the Operation is performing. 
The Method of ufing this Catheter is, firft, (after 
having taken the nccefiary Precautions, and filled the 
Bladder) to introduce the Catheter into the Bladder, 
then unbolt it at the Handle, and by holding the Tube 
in one Hand, and the Handle that moves the Legs in 
the other, then turn or open the Legs, till the Bolt 
becomes oppofite to the Second Hole upon the Plate 
into which the Bolt muft be thruft ; then by prelling 
gently the Handle downwards betwixt the Patient's 
Legs, the Two blunt Points will be eafily felt above 
the Os 'Pubis , in the Protuberance made by the I11- 
je&ion into the Bladder. 
The Advantages I propofe by ufing this Inftra- 
ment, are thefe : Firft, To be a Director for the Ope- 
rator, in determining the Place where the Pun&ure 
is to be made in the Bladder ; it alfo ferves as a Sup- 
port to the Bladder, when the Water flows out} and 
keeps it from fubfiding during the Time of the Ope- 
ration, and till the Stone is extracted : It ferves like- 
wife to refill the Preflure of the abdominal Mufcles 
and Peritoneum , and alfo hinders the Inteftines from 
being forced down upon the Knife; and keeps the 
Orifice open, till the Stone or Stones are brought 
away. And, laflly, by the Help of this Inftrument it 
may be difcovered, whether the Bladder is indurated 
or fcirrhous. 
The Method of performing this Operation, with 
Safety, is, after having introduced and fixed the Ca- 
theter with its Legs open, to feel for the Two Points 
5 k 2 above 
