The present invention provides a method of using autologous fibroblasts to promote wound or fistula healing in an animal. The device includes a first anchor configured to be positioned within and anchored to the coronary sinus of the heart adjacent the mitral valve annulus within the heart and a second anchor configured to be positioned within the coronary sinus of the heart proximal to the first anchor and adjacent the mitral valve annulus within the heart. The base member is brought into pressure-contact with the fixed member by a tightening force of a bolt.