Swatsurgeon,
Goodcatch with the patient. Did your patient thank you for helping?
Chance,
That's good looking work but I have strong second thoughts about making one of those myself.
Here is my take on making push daggers, as a knifemaker I'm trying to get good at making working fixed blade knives. The push dagger is not by my definition a working fixed blade and I would consider it rare for that knife to have enough use among the Quiet professional's to justify carrying.
The push dagger reminds me of something an old time gambler might carry since this was the era when the popularity of that weapon was high.
There is no grey area surrounding the function of the push dagger blade. This is not going to be helpful to the person carrying that knife if it is ever found on the person by law enforcement or used in a fully justifiable self defense situation.