Catheter Fluid Distribution Structure for Unobstructed Cryospray
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Solution Overview
Problem
Existing catheter systems for delivering cryogenic fluids, such as cryospray, often obstruct the spray pattern due to the presence of additional instruments like cryodecompression tubes, leading to untreated areas and inefficient treatment of target tissues.
Innovation Solution
The development of fluid distribution devices that integrate a cavity portion and instrument lumen, allowing for unobstructed delivery of cryospray through apertures while accommodating medical instruments, such as cryodecompression tubes, within the same lumen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional instruments like cryodecompression tubes are placed in the body lumen during cryosurgery, then gas evacuation function is improved, but the spray delivery is obstructed creating untreated areas
Solution Approach 1:
The instrument lumen is nested within the catheter body, allowing the cryodecompression tube to pass through the catheter structure. This nesting arrangement enables the instrument to occupy the internal space of the catheter without obstructing the external spray delivery path, thus maintaining both gas evacuation function and complete spray coverage.
Solution Approach 2:
The invention transitions from a two-dimensional spray plane to a three-dimensional fluid distribution system. The cavity portion extends in the longitudinal dimension, allowing fluid to be delivered from multiple apertures at different positions, thereby achieving complete coverage even when instruments are present in the treatment area.
2Stability of the object's composition
If instruments are placed remote to the treatment device against the body lumen surface, then instrument stability is improved, but untreated areas are created behind the tube
Solution Approach 1:
The catheter body is segmented into multiple functional zones: an instrument lumen for stable instrument placement, a cavity portion for fluid distribution, and multiple apertures at different longitudinal positions. This segmentation allows the instrument to remain stable in one location while fluid is delivered through multiple distributed apertures, ensuring complete treatment coverage without leaving untreated areas behind the instrument.
3Ease of operation
If guidewires are used to place tubes, then instrument positioning is improved, but additional obstruction is created in the working channel
Solution Approach 1:
The guidewire is nested within the instrument lumen during the positioning phase, allowing easy instrument placement. Once positioned, the guidewire can be removed, leaving the instrument lumen clear for fluid flow. This nested approach provides ease of operation during positioning without creating permanent obstruction in the working channel.
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
Enables efficient and uniform distribution of cryospray to target tissues without obstruction, ensuring complete treatment by allowing instruments to extend through the lumen while maintaining fluid delivery, thus improving treatment efficacy.
Implementation Method 1
a cryogen delivery catheter... The cryogen spray may exit the cryogen delivery catheter at a temperature ranging from 0° C. to −196° C., causing the target tissue to freeze
Implementation Method 2
one or more apertures along the wall of the body in fluid communication with the cavity portion so that a fluid delivered from the catheter may flow into the cavity portion through the inlet and out of the cavity portion through the one or more apertures
Data Source
AI summary
The present disclosure relates generally to the field of medical devices. In particular, the present disclosure relates to devices and methods to convey fluid delivered from a delivery catheter. Exemplary catheters are disclosed which include fluid distribution devices for delivery of fluid and delivery of pass-through medical instruments, such as cryodecompression tubes, within body lumens.