Medical Device Release System With Coil Spring Securement
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Solution Overview
Problem
There is a need for alternative medical devices and methods for manufacturing and using medical devices, particularly for intracorporeal applications, to improve the delivery and deployment of medical implants within the cardiovascular system, such as vascular occlusion devices, stents, and embolic coils, which require efficient release mechanisms to ensure precise placement and functionality.
Innovation Solution
A medical device system comprising an elongate shaft with a lumen, a release wire for attaching a medical device to the distal end, and a securement member that translates proximally to release the device while remaining connected to the shaft, utilizing a coil spring mechanism for biased translation and deformation to facilitate the release of the medical device from the shaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a securement member is fixedly attached to both the proximal end of the elongate shaft and the proximal end of the release wire, then the medical device can be securely held during delivery, but the release wire cannot be translated relative to the shaft to enable device release
Solution Approach 1:
The securement member is divided into a proximal portion and a distal portion, with the distal portion being a coil spring that can deform elastically. This segmentation allows the proximal portion to translate relative to the shaft while the distal portion maintains attachment to the shaft through elastic deformation, enabling both secure holding and release functionality
Solution Approach 2:
The distal portion of the securement member is designed as a coil spring that can dynamically deform between elastic and plastic states. During normal delivery, the spring remains elastic and maintains secure attachment. During release, the spring undergoes plastic deformation to allow permanent displacement and device release
2Ease of operation
If the coil spring undergoes elastic deformation during proximal translation, then the securement member can be translated to release the device, but the spring may not return to its original position for re-use
Solution Approach 1:
The release mechanism is designed as a single-use system where the coil spring is intentionally discarded after one use. The spring undergoes plastic deformation during release to ensure it cannot return to its original position, preventing accidental re-attachment. This design prioritizes patient safety over reusability, as the deformed spring cannot be reliably reused
Solution Approach 2:
The potential harm of spring deformation is converted into a benefit by designing the spring to undergo controlled plastic deformation during release. This permanent deformation ensures the release is irreversible and prevents accidental re-attachment, turning what could be a defect (spring damage) into a safety feature
3Ease of operation
If the proximal portion of the securement member translates proximally away from the proximal end of the elongate shaft, then the release wire can be translated to release the medical device, but the securement member structure becomes more complex
Solution Approach 1:
The securement member combines multiple functions into a single component: it provides secure attachment during delivery, enables release through proximal translation, and ensures irreversible release through plastic deformation of the coil spring. This merging reduces the need for separate components and simplifies the overall release mechanism
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 system enables precise and reliable deployment of medical devices by translating the release wire relative to the elongate shaft, ensuring the medical device is securely attached and released at the treatment site, enhancing the treatment of conditions like arterial venous malformations and other vascular diseases.
Implementation Method 1
the coil spring undergoes elastic deformation during proximal translation of the proximal portion of the securement member up to a predetermined axial location
Implementation Method 2
the coil spring undergoes plastic deformation after proximal translation of the proximal portion of the securement member axially past the predetermined axial location
Data Source
AI summary
A medical device system may include an elongate shaft having a lumen extending from a proximal end to a distal end, a release wire disposed within the lumen of the elongate shaft configured to releasably attach a medical device to the distal end of the elongate shaft, and a securement member fixedly attached to the proximal end of the elongate shaft and to a proximal end of the release wire. A proximal portion of the securement member may be configured to translate proximally away from the proximal end of the elongate shaft upon application of a proximally-directed force to the proximal portion of the securement member while the elongate shaft is maintained in a fixed position, wherein the proximal portion remains connected to the proximal end of the elongate shaft after proximal translation away from the proximal end of the elongate shaft.