Recently somebody donated a box of religious items to the parish. Most of it was things used at Mass. One thing in the box, however, was a sick call crucifix that I hung in one of the guest bedrooms.
Sick call crucifixes used to fascinate me as a child with its sliding secret compartment, candles, holy water, and other things. It seems a majority of Catholic homes had one usually near the bedrooms or in the living room just in case it might be needed. This does not seem to be the case anymore. Whereas Catholics are still highly encouraged to have a crucifix hanging in their houses, the sick call crucifix seems to be becoming a thing of the past. (It it is not in your area, I would be interested in hearing about it.)
In all actuality, I have never seen one used and today they are largely not necessary. I do remember my mother showing how they would be used if it were ever needed however. “Before the priest comes,” she said, “we would prepare for his arrival. He will not be very talkative because he is carrying the Blessed Sacrament and therefore will not be engaging in idle chit chat until after.” She then took the crucifix off of the wall and placed it on a table. The top of the crucifix slid off and could be set up right into the base. A small cloth (which I take to be a corporal) would be placed on the table where Father could place his pyx. Two tiny beeswax candles would also be set into the base and lit because of the presence of the Blessed Sacrament. There was also a little vile of holy water.
Today there does not seem to be the need for one of these crucifixes. The priest generally brings with him all the things he needs for a visit and such things as candles are either no longer needed or even forbidden as many people we visit are on oxygen the combination of which would send a person to his maker sooner than anticipated. But neither is there anything that forbid or make inappropriate the use thereof.