[An Integrated Audio-Visual-Olfactory Virtual Reality False Feeding Device: Research, Development, and Design].

OBJECTIVE: To resolve the problem of the lack of sensory stimulation from the colors and aromas of food when patients are given enteral nutrition support by tube feeding or simple oral administration, an immersive virtual reality (VR) sham feeding device integrating audio, visual, and olfactory sense perceptions was developed independently and the usability of the device was tested.

METHODS: Relying on the multidisciplinary cooperation of nursing, mechanical engineering, and computer science and using as a reference the characteristics of gastric tube and oxygen tube placement in clinical patients, we carried out 3D modeling and printing of the exterior framework of the odor box. Unity 3d.5.x, a mainstream virtual engine tool, was used to create scenarios. The device could create visual stimulation through 3 VR dining scenarios, 23 kinds of food, and comfortable dining environment. The sound of chewing was played to simulate the dining process and provide auditory stimulation. Through the independently researched and developed olfactory odor box, corresponding food aromas were sprayed out for olfactory stimulation. After the equipment prototype was created, 10 patients were recruited to perform users' subjective evaluation of the usability of the equipment.

RESULTS: A VR sham feeding device integrating audio-visual-olfactory stimulation was successfully developed. In the visual effect evaluation, all users commented that the vision was clear and unimpeded, and that the menu program could follow their rotation movement. Eight people considered the scenes to be rather realistic. In the auditory effect evaluation, all users stated that the volume of the sound was appropriate, and that they would hear a chewing sound being played when the food was approaching. In the olfactory effect evaluation, 9 people stated that they smelled the food aromas when the food was approaching, and that they thought the odor was real or partially real. On the whole, the equipment was convenient to use and all users thought that the equipment had clear presentation and could run stably and smoothly. No adverse reactions, such as dizziness, occurred in any users.

CONCLUSION: Successfully presenting visual, auditory, and olfactory stimuli, the prototype device passed the subjective usability test. The prototype device effectively expands the application prospects of VR in the medical field. In the future, it will be applied to patient populations, including surgical patients, patients with eating disorders, obesity, and loss of appetite, and other patients who cannot take in food through their mouths. The prototype device provides new ideas for promoting enhanced recovery after surgery and improving patient experience.