Pre-loaded Wire Guide Access Needle for Minimally Invasive Surgery
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing minimally invasive surgical access devices, such as those used for accessing a pancreatic pseudocyst, are inefficient due to the time-consuming process of retracting and removing a stylet to allow wire guide access, which can damage the wire guide and prolong procedure time.
Innovation Solution
An access needle device comprising an elongate flexible needle with a preloaded wire guide and an overlying sheath, allowing the needle to be advanced and retracted without damaging the wire guide, enabling efficient placement and removal while maintaining the wire guide in position for further device access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a blunt cannula is used to protect the wire guide, then the wire guide is protected from damage, but the procedure time increases due to the need to retract and remove the stylet
Solution Approach 1:
The wire guide is pre-loaded within the cannula assembly before the procedure begins. This preliminary configuration eliminates the need for stylet removal and wire guide insertion steps during the procedure, thereby reducing procedure time while maintaining wire guide protection through the cannula's blunt design
2Strength
If a sharp bevel-tipped needle is used for tissue penetration, then piercing capability is improved, but the wire guide may be stripped or damaged
Solution Approach 1:
The device is segmented into distinct functional components: a sharp bevel-tipped needle for tissue penetration, a blunt cannula for wire guide protection, and a pre-loaded wire guide. This segmentation allows each component to perform its specific function optimally without interfering with others, enabling both effective tissue penetration and wire guide protection
3Length of moving object
If the cannula length is increased to reach deep target sites like pancreatic pseudocyst, then accessibility to target site is improved, but the time to retract and remove stylet and direct wire guide increases
Solution Approach 1:
The wire guide is pre-positioned within the cannula lumen before the procedure. This preliminary action eliminates the time-consuming steps of stylet removal and wire guide insertion, which are particularly critical in long cannulas where these maneuvers would take significantly longer and pose higher risk of wire guide damage
Data Source
AI summary
A medical device is provided, configured to access a target site within a patient body. The device may be provided as a kit including pre-assembled components. Embodiments of the device include an elongate flexible access needle including a needle lumen disposed through at least a longitudinal length of the needle; an elongate wire guide pre-loaded into at least a lengthwise portion of the needle lumen and extending to at least near a distal end of the needle end; and a needle sheath including a longitudinal sheath lumen through which the access needle is disposed; where the distal needle end comprises a piercing tip configured for penetrating tissue to access a target site. A method of use is provided where the needle may be withdrawn over the pre-loaded wire guide after it has been directed to a target site and the sheath as been advanced over the needle's distal end, in a manner freeing the wire guide for further guidance or direction, and for introduction of another device along the wire guide.