Cavity retaining tool for bone surgery, a cavity retaining tool for general surgery, an endoscopic surgery system involving the use of a cavity retaining tool, and a procedure for surgery

A method involving the use of an endoscopic surgery system which comprises a sheath for surgery having a cavity-retaining means at a tip and includes a plurality of ports, and which consists of:

• a. preparing a route for advancing into the body from a specific position and with a specific angle;
• b. advancing a sheath for surgery along the route and retaining a cavity with a cavity-retaining means;
• c. inserting, after the sheath is removed from the body, sheaths for endoscopic insertion and for tool insertion into the cavity retained by the cavity-retaining means;
• d. inserting an endoscope either through the sheath for surgery or through the sheath for tool insertion, and then inserting tools through an unused sheath;
• and
• e. making an operation under endoscopic observation.

An endoscopic surgery system, comprising:

• a cavity retaining tool having a cavity-retaining means which is introduced through a skin incision into body tissues, and retains a cavity for surgery works, and a communicating means which communicates with the cavity retained by the cavity-retaining means and interconnects the cavity with the space out of the body;
• at least one port for inserting tool as endoscope and treatment tools which is introduced through a skin incision other than above to penetrate the wall of cavity-retaining tool to be led into the cavity retained by the cavity-retaining tool;
• and
• an interconnecting means which interconnects the port and the cavity-retaining tool in body tissues.

A cavity-retaining tool for retaining a cavity for surgery which is inserted through body tissues into the body comprising:

• a cavity-retaining member to retain a cavity for surgery works in the body;
• and
• a communicating member to be connected to the cavity-retaining member and to interconnect the cavity with the space outside the body,
• wherein a cross-sectional area of the communicating member is smaller than an inner cross-sectional area of the cavity retained by the cavity-retaining member, the cavity-retaining member including an end portion having contour means for mating the end portion to a selected surface of a bone.

A cavity-retaining tool for bone surgery, comprising:

• a cavity-retaining sheath which is inserted into body tissues so that an internal cavity thereof forms a work space for bone surgery;
• a treatment channel attached to the cavity-retaining sheath to guide tools necessary for bone treatment into the work space for bone surgery;
• an observation means attached to the cavity-retaining sheath by which to observe an operation field in the work space for bone surgery;
• and
• a tissue-contour fitting means placed at a tip of the cavity-retaining sheath for mating the tip faithfully to. a contour or shape of a bone.