I don't believe that 97750 would be appropriate for wound care training of a caregiver as the code is defined as:
Caregiver training in strategies and techniques to facilitate the patient's functional performance in the home or community (eg, activities of daily living [ADLs], instrumental ADLs [iADLs], transfers, mobility, communication, swallowing, feeding, problem solving, safety practices) (without the patient present), face to face;
Wound care isn't about ADLs.