The ornamental design for a surgicalinstrument, as shown and described.
1.-4. Surgical instrument
1.1 : Front
1.2 : Back
1.3 : Left
1.4 : Right
1.5 : Top
1.6 : Bottom
1.7 : Perspective
2.1 : Front
2.2 : Back
2.3 : Left
2.4 : Right
2.5 : Top
2.6 : Bottom
2.7 : Perspective
3.1 : Front
3.2 : Back
3.3 : Left
3.4 : Right
3.5 : Top
3.6 : Bottom
3.7 : Perspective
4.1 : Front
4.2 : Back
4.3 : Left
4.4 : Right
4.5 : Top
4.6 : Bottom
4.7 : Perspective
The dashed lines in reproductions 2.1 through 2.7 depict portions of the surgical instrument that form no part of the claim. The low-contrast portions of the renderings in reproductions 4.1 through 4.7 depict portions of the surgical instrument that form no part of the claim.