In the Principles of Medical Ethics of the American Medical Association it is stated quite plainly that:
It is unprofessional to receive remuneration from patents for surgical instruments or medicines; to accept rebates on prescriptions or surgical appliances, or perquisites from attendants who aid in the care of patients.
Through the centuries medicine has given freely of its discoveries for the benefit of mankind. Vaccination against smallpox, inoculation against hydrophobia, digitalis and innumerable other methods and medicaments became the property of all who cared to employ them in the control of disease. Now as medicine has become more complex, involving technical assistants in the fields of biochemistry, physiology, physics and associated branches, great numbers of people who give their full time to the work of the hospital, the laboratory or the care of the sick work with the medical profession but are not bound in any way by the
FISHBEIN M. MEDICAL PATENTS. JAMA. 1937;109(19):1539-1543. doi:10.1001/jama.1937.92780450009012