Abstract: A surgical retractor device has a housing with press arms coupled thereto, each arm having rotational movement in a plane, and a gripping member pivoting at right angle with the plane, at an outer end of the arm; an attachment means at an inner end of the arm; an opening and closing mechanism with rotatable press arm attachment structures attaching the attachment means of the press arms, symmetrically positioned from a centerline of the device; rotatable handle attachment structures, and; a transfer mechanism transferring rotation from handle attachment structures to press arm attachment structures. The device also has handles for operating the opening and closing mechanism. Each handle has a handle attachment means at an inner end of the handle for attachment to the handle attachment structures; and, a handle structure. The handles have a rotational movement in the plane and are symmetrically positioned from the centerline of the device.

Abstract: The present invention relates to a rotary machine that can be employed in different applications such as, for example, a combustion engine or compressor. The invention further relates to an assembly of two or more rotary machines and a combustion engine based on the rotary machine. The machine is substantially composed of a helical screw-shaped rotor connected to an outgoing shaft journal, which screw-shaped rotor rotates in a cylindrical housing. The machine is further provided with rotating chamber dividing bodies whose rotation is synchronised with the rotating screw-shaped rotor. The chamber dividing bodies divide the helical screw grooves into chambers whose volume varies with rotation of the screw-shaped rotor.