Radially expandable cannula system

Abstract

A radially expandable trocar, port or cannula system is provided for use in minimally invasive surgeries. The cannula creates a port access with an initial small internal diameter. The passage of thecannula devices is defined by a plurality of elongate rigid members. A number of mechanisms are provided for expanding the passage of the cannula devices, by moving the plurality of elongate rigid members towards a larger radial location, thereby creating a larger internal diameter for the port. The elongate rigid members can be prevented from unintended movement when the system is at the un-expanded state, during expansion and when it is expanded to the desired larger diameter. Example embodiments include methods of preventing gas loss from the tissue that would occur through the gaps createdduring expansion.

Description

[0001] cross reference [0002] This application claims priority to U.S. Provisional Patent Application No. 62 / 554,802, filed September 6, 2017, entitled RADIALLY EXPANDABLE CANNULA SYSTEM, and Canadian Patent Application No. 2993590, filed January 31, 2018, entitled RADIALLY EXPANDABLE CANNULA SYSTEM The entire content of said patent application is hereby incorporated by reference into the following detailed description. technical field [0003] The technical field relates generally to methods and devices for use in minimally invasive surgery or keyhole surgery. For example, the technical field relates to cannula devices and trocar devices for insertion into an incision. Background technique [0004] In minimally invasive surgery, small incisions are made. A cannula or port device (called a trocar) is then inserted through the incision to create a passage through which a surgical device can be passed to perform the minimally invasive procedure. It is the surgeon's goal t...

AI Technical Summary

Problems solved by technology

However, insertion of large diameter ports into delicate brain tissue can cause critical tissue and nerve damage

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