Medical device, medical device assembly, balloon device, and treatment method for treating urethral stricture

A balloon device comprising:

• a flexible main body that extends in an axial direction;
• and
• a balloon that includes an effectively dilatable portion on which a medical member is mounted, that has a dilating space into which a pressurizing medium flows between an outer surface of the main body and the balloon, and that is capable of dilating deformation and deflating deformation,
• wherein the main body has a lumen which extends in the axial direction, an opening portion for inserting an elongated guide member into the lumen, and a hole portion which extracts the guide member from the lumen to the outside of the main body, and
• wherein the balloon includes an extracting portion for extracting the guide member extracted from the hole portion to an outer surface side of the balloon.

A balloon device comprising:

• a flexible main body that extends in an axial direction;
• multiple balloons that respectively include an effectively dilatable portion on which a medical member is mounted, that are respectively arranged at different positions in the axial direction of the main body, that have a dilating space into which a pressurizing medium flows between an outer surface of the main body and the balloon, and that are capable of dilating deformation and deflating deformation;
• and
• a flexible film material that is arranged so as to cover the respective effectively dilatable portions of the multiple balloons,
• wherein the main body has a lumen which extends in the axial direction, an opening portion for inserting an elongated guide member into the lumen, and a hole portion which extracts the guide member from the lumen to the outside of the main body, and
• wherein the film material includes an extracting portion for extracting the guide member extracted from the hole portion to an outer surface side of the film member.

A treatment method for a urethral stricture comprising:

• a forming process of forming a treatment site by performing predetermined treatment on a scar tissue formed in a urethra;
• an arrangement process of arranging an elongated guide member at the treatment site via the urethra;
• a delivery process of delivering a medical device including a balloon having a medical member mounted thereon to the treatment site along the guide member;
• and
• an indwelling process of causing the medical member to indwell over a predetermined period of time by dilating the balloon positioned at the treatment site and maintaining a state where the medical member is brought into contact with the treatment site.