Sometimes, a nail is so ingrown that it's very painful or outright impossible to insert cotton under it.
At the pointed end of the piriform recess, it was impossible to insert the tip of the IT-knife (Fig. 3b).
It also provides a means of authentication making it impossible to insert a fake fingerprint without explicit permission to do so.
Unfortunately, I lost this round of the Cheapskate Lottery: on the one I bought, the DVD tray itself refused to open, making it impossible to insert a disc and presenting something of an obstacle to my testing regimen.
The oral insertion of a gastric tube was then possible; however, it was impossible to insert a transesophageal echocardiographic probe.
It was impossible to insert an airway stent for 5 of these patients, who unfortunately rapidly died (table 2).
Fourthly, in the roughly 10% of cases where it proves impossible to insert a PEG catheter, the prophylaxis is given in vain.
Note that it is impossible to insert the teat straight between their front teeth.
Moreover, as a result of the smaller diameter at the femoral neck compared with the intertrochanteric area, it theoretically is impossible to insert a component from one side only and have a perfect anatomic fit [ 56].
However, in these conditions, it is for various reasons difficult or impossible to insert intracerebral catheters.
