Surgical instrument with preload assembly

• US 9,675,359 B2
• Filed: 10/10/2012
• Issued: 06/13/2017
• Est. Priority Date: 10/10/2012
• Status: Active Grant

• Current Assignee: Covidien LP (Medtronic Plc)
• Original Assignee: Covidien LP (Medtronic Plc)
• Inventors: Williams, Justin
• Primary Examiner(s): Desai, Hemant M
• Assistant Examiner(s): Ahmed, Mobeen
• Application Number:
  US13/648,692
• Publication Number:
  US 20140097226A1
• Time in Patent Office: 1,707 Days
• CPC Class Codes: A61B 17/068 Surgical staplers , e.g. containing multiple staples or clampsstaplers containing only one staple A61B17/10; magazines or containers for staples A61B17/105; for performing anastomosis A61B17/115; staplers in general B25C5/00
• CPC Class Codes: A61B 17/072 for applying a row of staples in a single action , e.g. the staples being applied simultaneously
• CPC Class Codes: A61B 17/07207 the staples being applied sequentially
• CPC Class Codes: A61B 17/115 Staplers for performing anastomosis in a single operation
• CPC Class Codes: A61B 17/1155 Circular staplers comprising a plurality of staples
• CPC Class Codes: A61B 2017/00473 Distal part, e.g. tip or head A61B2017/00464 takes precedence
• CPC Class Codes: A61B 2017/00991 Telescopic means
• CPC Class Codes: A61B 2090/034 abutting on parts of the device itself
• CPC Class Codes: A61B 2090/0811 for the position of a particular part of an instrument with respect to the rest of the instrument, e.g. position of the anvil of a stapling instrument

Abstract

A surgical instrument comprising a handle assembly, an elongated body portion extending distally from the handle assembly, a head portion and a preload assembly is disclosed. The head portion is disposed adjacent a distal end of the elongated body portion and includes an anvil assembly and a shell assembly. The anvil assembly is movable in relation to the shell assembly between spaced and approximated positions. The preload assembly is disposed in mechanical cooperation with the shell assembly and enables longitudinal movement of the shell assembly with respect to the elongated body portion.

Claims

1. A surgical instrument, comprising:

a handle assembly;

an elongated body portion extending distally from the handle assembly and defining a longitudinal axis;

a head portion disposed adjacent and in contact with a distal end of the elongated body portion and including an anvil assembly and a shell assembly, the anvil assembly being movable in relation to the shell assembly between spaced and approximated positions, wherein when the anvil assembly moves toward the approximated position, the anvil assembly moves in a proximal direction with respect to the elongated body portion; and

a preload assembly disposed in mechanical cooperation with the shell assembly, the preload assembly enabling longitudinal movement of the shell assembly with respect to the elongated body portion, the preload assembly including a housing, an outer tube, and a biasing member, the biasing member being disposed concentrically around the elongated body portion, a majority of the outer tube is disposed concentrically around the elongated body portion and in mechanical cooperation with the shell assembly, the outer tube being longitudinally translatable with respect to the elongated body portion, the biasing member being disposed in contact with a proximal portion of the outer tube and biases the outer tube distally with respect to the elongated body portion, the housing being disposed concentrically around the biasing member and concentrically around the proximal portion of the outer tube, and wherein the housing is disposed in contact with the handle assembly.