The standard percussor palm cups are made out of a soft vinyl material molded into shape. The outer diameter of the infant palm cup is 1-3/4 inches and there is a 1-inch diameter pocket inside this product similar to a suction cup.

This product was developed by MMRI personnel using a small custom 3D printed plastic handle and a 0.93-inch, single bellow, Buna-N rubber suction cup. The handle was made on the MMRI's 3D printer using ABS plastic and the suction cup was sourced from McMaster Carr (#5427A106). The handle is made up of three pieces; top, base and a pin that is designed to fix the top, base and suction cup to each other. There is a small hole through the pin which helps relieve some of the pressure that builds in the suction cup during use. It is not shown in the image to the right, but the handle will be coated in Plasti Dip for added user comfort.

This product was developed by MMRI personnel using a large custom 3D printed plastic handle and a 0.93-inch, single bellow, Buna-N rubber suction cup. The handle was made on the MMRI's 3D printer using ABS plastic and the suction cup was sourced from McMaster Carr (#5427A106). The handle is made up of three pieces; top, base and a pin that is designed to fix the top, base and suction cup to each other. There is a small hole through the pin which helps relieve some of the pressure that builds in the suction cup during use. It is not shown in the image to the right, but the handle will be coated in Plasti Dip for added user comfort.

Patients/guardians/caregivers will be given 3 percussor palm cups to use over the course of 6 days. Each cup will be trialed for 2 days, allowing for equal time dedicated to each.

Participants and families will be asked to report any adverse effects of the use of the PCC. These could include erythema of the skin, bruising or general discomfort using a 5-point Likert scale (1 = very disatisfied, 5 = very satisfied) and open-ended questions. A higher value on the Likert scale indicates a better outcome as the participant identifies that they were satisfied when using the cup. This will also be used to compare satisfaction between cups.

The Pictorial Single-Item Usability Scale (PSIUS) is an instrument used to measure perceived usability and satisfaction of each cup. This scale concludes three main visual elements that evaluate satisfaction and emotions experience while using a system or product. It uses visual images of disatisfaction to satisfaction, following a 9-point scale (-4 = very disatisfied, 4 = very satisfied). A higher number indicates a better experience when using the cup. This pictorial single-item scale will be used within our questionnaire to assess the overall rating of satisfaction and usability when using the Percussion Palm Cups.

The Quebec User Evaluation Utility Questionnaire (QUEST) is designed to evaluate user satisfaction and dissatisfaction with assistive devices. It is the most commonly used standardized instrument for measuring user satisfaction with a broad range of assistive technology devices. The revised QUEST 2.0 version includes a 12-item structure, with each item scored using a 5-point satisfaction scale (1= not satisfied at all, 5 = very satisfied). Additionally, the user is asked to comment on the source of their dissatisfaction or satisfaction on each item. We will use the applicable items (8 in total) Comfort, Dimensions, Simplicity of Use, Effectiveness, Durability, Adjustments, Safety, and Weight.