Medical apparatus

1. A medical apparatus comprising:

an operation portion configured to be grasped by an operator;

an annular wall portion including a base portion connectedly provided to an exterior case of the operation portion and a protruding end portion protrudingly provided from the base portion by a predetermined height;

an operation lever extended outside the operation portion from inside the operation portion in an area covered by the wall portion and configured so that the operator can perform a tilt operation to the operation portion;

a cover including a first fitted portion fitted to the operation lever, a deforming portion connectedly provided to the first fitted portion and configured to deform accompanying a tilt of the operation lever, and a second fitted portion connectedly provided to the deforming portion, an inner circumferential surface of the second fitted portion being fitted to an outer circumferential surface of the wall portion; and

an elastic member formed of rubber including a contact portion in contact with an outer circumferential surface of the second fitted portion, the contact portion being fixed to the exterior case and being deformed to press the outer circumferential surface of the second fitted portion;

wherein the contact portion of the elastic member tapers off from the base portion side toward the protruding end portion side and has a triangular cross section.

2. The medical apparatus according to claim 1 , wherein watertightness of the cover against the wall portion is secured at the second fitted portion.

3. The medical apparatus according to claim 2 , further comprising a seal formed on the second fitted portion, the seal being configured to secure the watertightness between the contact portion and the wall portion.

4. The medical apparatus according to claim 3 , wherein the seal is thickest at an end of the second fitted portion.

5. The medical apparatus according to claim 1 , wherein the contact portion of the elastic member is in contact with the outer circumferential surface of the second fitted portion on a side of the base portion relative to the protruding end portion of the wall portion and the elastic member presses the second fitted portion against the wall portion.

6. A medical apparatus comprising:

an operation portion configured to be grasped by an operator;

an annular wall portion including a base portion connectedly provided to an exterior case of the operation portion and a protruding end portion protrudingly provided from the base portion by a predetermined height;

an operation lever extended outside the operation portion from inside the operation portion in an area covered by the wall portion and configured so that the operator can perform a tilt operation to the operation portion;

a cover including a first fitted portion fitted to the operation lever, a deforming portion connectedly provided to the first fitted portion and configured to deform accompanying a tilt of the operation lever, and a second fitted portion connectedly provided to the deforming portion, an inner circumferential surface of the second fitted portion being fitted to an outer circumferential surface of the wall portion;

an elastic member formed of rubber including a contact portion in contact with an outer circumferential surface of the second fitted portion, the contact portion being fixed to the exterior case and being deformed to press the outer circumferential surface of the second fitted portion; and

a rigid body at least partially disposed in the elastic member such that the rigid body presses the contact portion of the elastic member against the second fitted portion of the cover and the second fitted portion presses against the outer circumferential surface of the wall portion.

7. The medical apparatus according to claim 1 , wherein the rigid body is integrally formed with the elastic member.