Shape-Memory Magnetic Anastomosis Coil With Integrated Drainage
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Solution Overview
Problem
Existing anastomosis devices require multiple punctures, sharp piercing mechanisms, and rely on magnetic forces for orientation, leading to potential organ injury, tissue damage, and inefficient anastomosis formation, often necessitating additional interventions for drainage.
Innovation Solution
A shape memory alloy (SMA) wire transforms into a coil with magnets to create an anastomosis via a single puncture, using a cautery tip for tissue piercing and magnetic attraction for compression, allowing for a single-operator procedure with integrated drainage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If prior art devices use a piercing tip to create anastomosis, then anastomosis formation is achieved, but organ injury and tissue damage occur
Solution Approach 1:
The patent removes the harmful piercing tip from the device, extracting only the essential function of creating an opening while eliminating the tissue damage caused by mechanical piercing. The device uses magnetic attraction between two organs to create the anastomosis without direct mechanical contact or piercing of the organ walls.
Solution Approach 2:
The patent introduces magnetic fields as an intermediary force to bring the two organs together and create the anastomosis. Instead of directly piercing the tissue, magnetic forces act as a mediator to compress and fuse the organ walls, reducing direct mechanical trauma while achieving the same therapeutic effect.
2Ease of operation
If prior art instruments use a grasping mechanism to manipulate tissue, then tissue manipulation is achieved, but the device becomes difficult to maneuver
Solution Approach 1:
The patent replaces the complex mechanical grasping mechanism with a simpler magnetic field-based system. The magnets on the device surfaces create attractive forces that manipulate and hold the organs in position without requiring mechanical graspers, clamps, or complex actuating mechanisms, thereby simplifying the device while improving ease of operation.
3Reliability
If prior art devices require two punctures for operation, then anastomosis can be formed, but the chance of leak from puncture sites increases
Solution Approach 1:
The patent eliminates the need for puncture sites by removing the piercing function entirely. The device creates anastomosis through magnetic compression and fusion of organ walls at the interface, extracting the harmful puncture step while maintaining the therapeutic benefit of creating a functional connection between organs.
4Device complexity
If prior art magnetic anastomosis devices use a single loop polygon shape deployment configuration, then device simplicity is maintained, but out-of-plane bending capability is limited
Solution Approach 1:
The patent employs flexible materials with superelastic properties that allow the device to dynamically adapt its shape in three dimensions. The device can bend out-of-plane and conform to complex anatomical geometries while maintaining structural integrity and magnetic functionality, transitioning from a static single-loop configuration to a dynamic, multi-dimensional structure.
5Reliability
If prior art devices require additional interventions for drainage, then complete anastomosis is achieved, but treatment time and complexity increase
Solution Approach 1:
The patent combines the anastomosis creation function and drainage function into a single integrated device. The magnetic compression mechanism simultaneously creates the fistula tract and establishes drainage capability, merging what were previously separate procedural steps into one unified intervention, thereby reducing treatment time and procedural complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device facilitates efficient, minimally invasive anastomosis creation with reduced organ injury, immediate fluid communication, and integrated drainage, eliminating the need for separate devices and manual positioning.
Implementation Method 1
a wire, wherein said wire has a first state and a second state, wherein, in said first state, the wire has a substantially linear form, wherein, in said second state, the wire forms a coil... and wherein said wire is adapted to transform from the first state to the second state when exposed to a temperature greater than a threshold value
Implementation Method 2
a plurality of magnets positioned over the first loop and the second loop... a portion of said plurality of magnets in the first loop are configured to attract a portion of said plurality of magnets in the second loop
Implementation Method 3
A shape memory alloy (SMA) wire transforms into a coil with magnets to create an anastomosis via a single puncture, using a cautery tip for tissue piercing
Data Source
Figure 1~2
Figure 3A
Figure 3B
AI summary
An anastomosis device includes magnets coupled to a wire capable of changing shape from a straight wire into a coil when deployed within a body. The coil exerts compressive force upon layers of tissue caught between loops of the coil. The compressive force is enhanced by attractive forces between magnets coupled with adjacent loops of the coil and causes the coil to cut through the tissue layers, creating an anastomosis. One end of the wire is preferably provided with a connecting member, such as a screw or a nut, for connecting with a delivery device. Positioned on or around the anastomosis device is an expandable drainage mechanism, such as a stent.