Operating scalpel with shell

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention.

[0018] The detailed content of the present invention and its specific implementation will be further described below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the invention. see Figure 1-4 Shown, a kind of scalpel scalpel of the present invention comprises knife handle (1), knife tip (2), and knife handle (1) and knife tip (2) can be replaced, and knife shell (3) is positioned at knife handle (1), It can be stretched along the knife handle (1). The knife case (3) expands and contracts along the moving path (4) on the knife handle (1). There is a protrusion (5) on the cutter housing (3), and the protrusion (5) has certain elasticity, and the le