Orthopedics maker Soft Tissue Regeneration is closing in on a $5 million funding round, with $4.7 million raised so far.

The New Haven, Conn.-based company is raising funds through sales of equity, options, warrants and other securities, with 14 unnamed investors listed so far in regulatory filings.

The company is working on products for soft tissue regeneration for knee ligaments using an FDA-approved polymer already common in medical implants.

STR in January won FDA clearance for its Str graft, a biodegradable scaffold that can lessen patient’s pain and reduce surgical failure rates following rotator cuff surgery.