Pivoting Surgical Cannula With Threaded Self-Retention
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Solution Overview
Problem
Conventional surgical cannulas are too small for unimpeded access, require external clamping arms for stability, and lack effective lighting and irrigation systems, leading to obscured visibility during surgical procedures.
Innovation Solution
A surgical cannula with a pivotally attached body, a flange portion, and threaded surface for self-retention, along with channels for light, irrigation, and suction, allowing for increased access and stability without external support, and improved visibility and material removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional surgical cannulas are used, then the surgical site can be accessed, but the diameter is too small to provide unimpeded access and external clamping arms are required to hold the cannula in position
Solution Approach 1:
The cannula incorporates a threaded surface that allows it to be screwed into the patient's body tissue, enabling self-retention without requiring external clamping arms. This self-service mechanism eliminates the need for additional external support structures while maintaining stable positioning during the surgical procedure
Solution Approach 2:
The cannula body is divided into multiple segments that can pivot relative to one another, allowing the cannula to expand or change configuration. This segmentation enables the cannula to provide greater access space while maintaining structural integrity and self-retention capabilities
2Illumination intensity
If conventional surgical cannulas are used, then access to the surgical site is provided, but visibility is obscured by smoke, bone dust, and blood
Solution Approach 1:
The cannula integrates multiple functions including illumination channels, irrigation channels, and suction channels within a single device. This multi-functionality allows the cannula to simultaneously provide lighting, deliver irrigation fluid to wash away obscuring materials, and remove smoke, bone dust, and blood through suction, thereby maintaining clear visibility at the surgical site
3Reliability
If conventional surgical cannulas are used, then the cannula can be inserted into the patient's body, but it requires full anesthesia to prevent patient movement that could dislodge the cannula
Solution Approach 1:
The threaded surface on the cannula enables it to be securely screwed into the patient's body tissue, providing self-retention and stable positioning. This reliable anchoring mechanism maintains cannula position even during patient movement, eliminating the need for full anesthesia and external clamping arms
4Quantity of substance
If conventional surgical cannulas are used, then access is provided, but irrigation liquid delivery is difficult
Solution Approach 1:
The cannula includes dedicated irrigation channels that extend from the exterior surface to the distal end at the surgical site. These integrated channels provide straightforward delivery of irrigation liquid directly to the surgical site, eliminating the difficulty associated with conventional cannulas that lack such dedicated pathways
Data Source
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AI summary
A cannula body of the surgical cannula has a flange attached to a proximal end. The cannula body is defined by two complementary portions, pivotally connected together proximate the flange. The cannula body has a bore extending from the flange to the surgical site. The cannula is inserted above the surgical site, until a lower surface of the flange contacts the superficial fascia, which acts as a stop to prevent over-insertion. A thread provided on the cannula body holds the cannula in position in the body. Apertures in the flange communicate with channels within the cannula body that extend to the surgical site to provide the surgeon with additional means to provide light, irrigation, and/or suction to and from the surgical site. The two complimentary portions can be pivoted apart from one another to provide an increased amount of access to the surgical site.