36-year-old Charles Haig Guenther was arrested on Tuesday for a domestic violence incident in Los Osos.
The victim received injuries to her hands, fingers, stomach and leg.
Guenther is charged with assault with a deadly weapon and inflicting corporal injury on a spouse.
The investigation has been forwarded to the San Luis Obispo County District Attorney's Office. Additional charges may be filed, including: attempted murder, false imprisonment and making terrorist threats.