A medical surgery imaging device (305, 500, 805) designed to be inserted into a patient's body, comprising: a tube in the form of a cylinder-shaped tube, comprising a medical imaging device, comprising a half-round-shaped base and an elongated half cylinder tube, the elongated half cylinder tube having a supporting stair positioned orthogonally to a flat surface of the elongated half cylinder tube, a front interface, a camera module (350, 450); and a replaceable surgical gas path apparatus, comprising a half-rounded base, a half-cylinder-shaped tube (370, 530, 650,840), an entrance gas path located within the half-cylinder-shaped tube (370, 530) and defined between an entrance gas port (220,315, 535,610, 825, 907) and a gas exit port (225, 365, 830) in which gas is dispensed into a body cavity and a release gas path located within the half-cylinder-shaped tube (370, 530) and defined between a gas releasing port (210,310, 525, 615, 815, 908) and a gas entry port (230, 360, 835) in which gas is dispensed out of the body cavity, characterized in that the half-rounded base is configured to be attached to the half-round-shaped base to form a top round surface (850, 715), and wherein the supporting stair is configured to facilitate the half-cylinder-shaped tube to be attached to elongated half cylinder tube to jointly form the cylinder-shaped tube, wherein the attachment of the replaceable gas path apparatus to the medical imaging device forms the medical surgery imaging device (305, 500, 805) and wherein the gas path apparatus is located inside the tube and designed to maintain a gas pressure level within said cavity or hollow in a body. a medical imaging device, comprising a half-round-shaped base and an elongated half cylinder tube, the elongated half cylinder tube having a supporting stair positioned orthogonally to a flat surface of the elongated half cylinder tube, a front interface, a camera module (350, 450); and a half-round-shaped base and an elongated half cylinder tube, the elongated half cylinder tube having a supporting stair positioned orthogonally to a flat surface of the elongated half cylinder tube, a front interface, a camera module (350, 450); and a replaceable surgical gas path apparatus, comprising a half-rounded base, a half-cylinder-shaped tube (370, 530, 650,840), an entrance gas path located within the half-cylinder-shaped tube (370, 530) and defined between an entrance gas port (220,315, 535,610, 825, 907) and a gas exit port (225, 365, 830) in which gas is dispensed into a body cavity and a release gas path located within the half-cylinder-shaped tube (370, 530) and defined between a gas releasing port (210,310, 525, 615, 815, 908) and a gas entry port (230, 360, 835) in which gas is dispensed out of the body cavity, a half-rounded base, a half-cylinder-shaped tube (370, 530, 650,840), an entrance gas path located within the half-cylinder-shaped tube (370, 530) and defined between an entrance gas port (220,315, 535,610, 825, 907) and a gas exit port (225, 365, 830) in which gas is dispensed into a body cavity and a release gas path located within the half-cylinder-shaped tube (370, 530) and defined between a gas releasing port (210,310, 525, 615, 815, 908) and a gas entry port (230, 360, 835) in which gas is dispensed out of the body cavity,