Thanks for the additional input. I think I have a solution for you.
The tax issue is one aspect, but managing long distance sales is another. You have located an independent contractor who can't pay you for the equipment and resell it. If you did, easy solution, and my first answer covers it.
Salesmen are a funny breed, they think they should be paid before anyone else. Have the hospital pay you directly, then cut the commission check when the payment clears. Asking for joint checks or a check to the sales agent and another to you is unattractive.
If this contractor can't take title and pay you, finding another might be your best option. If they can not support a line of credit
or otherwise be able to pay for your product, I would steer clear of them. Just imagine the trouble and expense if you did not get paid after you shipped, and the hospital paid your contractor.
This is not tax driven advice, but it sounded like you had concerns about selling to your contractor on credit, and waiting for your payment from the other side of the country.
Thanks again for asking at Just Answer.