The ornamental design for a cathetergrippingaid, as shown and described.
FIG. 1 is a perspective view of a catheter gripping aid, showing the new design.
FIG. 2 is a top plan view thereof.
FIG. 3 is a bottom plan view thereof.
FIG. 4 is a right side elevational view thereof.
FIG. 5 is a left side elevational view thereof.
FIG. 6 is a rear elevational view thereof; and,
FIG. 7 is a front elevational view thereof.
The dot-dash lines depict the boundaries of the claimed design and form no part thereof. The dash-dash broken lines depict portions of the catheter gripping aid that form no part of the claimed design.