Medical device

A medical device for removing an object in a body lumen, the medical device comprising:

• a rotatable drive shaft having a lumen;
• and
• a housing that contains a proximal portion of the drive shaft and has a discharge port through which the cut object is discharged,
• wherein the drive shaft has a proximal opening portion that extends around a portion of a circumference of the drive shaft to expose a discharge opening for the cut object, and
• wherein the discharge port includes a discharge hole through which the cut object discharged through the discharge opening of the proximal opening portion is discharged from the housing, and a guide surface that protrudes toward the proximal opening portion to guide the cut object into the discharge hole.

A medical device for removing an object in a body lumen, the medical device comprising:

• a rotatable drive shaft having a lumen;
• a cutting portion fixed to a distal portion of the drive shaft to cut the object;
• and
• a housing that contains a proximal portion of the drive shaft and has a discharge port through which the cut object is discharged,
• wherein the drive shaft has a proximal opening portion that extends around a portion of a circumference of the drive shaft to expose a discharge opening for the cut object, and
• wherein the discharge port includes a discharge hole on a surface of the discharge port that faces a direction that is opposite to a moving direction of the drive shaft at a top of the drive shaft and through which the cut object discharged through the discharge opening of the proximal opening portion is discharged from the housing.

A method of removing an object in a body lumen, said method comprising:

• positioning a cutter fixed to a distal portion of a drive shaft to cut the object;
• rotating the drive shaft to cut the object with the cutter and aspirating the cut object into a lumen of the drive shaft;
• discharging the cut object in the lumen of the drive shaft to a housing that contains a proximal portion of the drive shaft, wherein the proximal portion of the drive shaft has a discharge opening for the cut object that extends around a portion of a circumference of the drive shaft;
• and
• further discharging the cut object through a discharge port of the housing, wherein the discharge port is located above the discharge opening of the drive shaft and includes a first guide surface protruding toward the discharge opening of the drive shaft to guide the cut object into a passage of the discharge port through which the cut object is further discharged.