Any ideas on an automatic collection device?

Working on a project. Looking for ideas.
a collection device that will be mounted on a toilet for automatic collection of human stool

The technical requirements and development constraints of the system are:

Requirements
Attach to a patient toilet with a ‘universal’ design (i.e. can attach to both round and elongated toilet shapes)
With no or minimal interaction with the patient, collect > 1 gram of stool during the bowel movement
Stool cannot come into contact with the toilet bowl or water
Stool sample is internalized and liquified

Constraints
System must be mostly, if not fully automated
System must attach to a patient toilet and be as discrete as possible (reference: commercial bidet designs)
System must be cleanable or have a disposable sample contacting part