Annuloplasty Stitching Device Pivoting Loop Mechanism
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Solution Overview
Problem
Current stitching devices for medical implants cause substantial tissue damage, are difficult to use in tight spaces, and are time-consuming due to the need for multiple punctures, leading to increased patient risk and prolonged surgery.
Innovation Solution
A single-action stitching device with a support structure and movable stitching arrangement that allows for a compact, pivoting mechanism to create a thread loop around an implant in a single movement, reducing tissue damage and improving navigation in limited spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sewing-machine like arrangement with needle projection and retraction is used, then the implant can be secured to tissue, but substantial tissue damage occurs due to multiple punctures
Solution Approach 1:
The patent combines multiple puncture actions into a single puncture event. The device creates one puncture through the tissue and forms a loop structure that allows the implant to be secured without requiring additional puncture strokes, thereby reducing tissue damage while maintaining reliable implant attachment
Solution Approach 2:
The device employs a dynamic loop formation mechanism where the stitching member creates a movable loop structure after a single puncture. This dynamic structure allows the implant to be captured and secured through the loop without requiring the needle to retract and re-puncture the tissue multiple times
2Reliability
If a bent needle with thread is used to puncture tissue, then the implant can be secured, but large spacing is required at the stitch site for needle maneuvering
Solution Approach 1:
The patent transitions from a two-dimensional needle maneuvering approach to a three-dimensional loop structure. The stitching member forms a loop that extends in multiple dimensions, allowing the implant to be captured spatially without requiring large lateral spacing at the stitch site for needle manipulation
3Reliability
If sequential stitching approach is used, then the implant can be secured with proper stitching, but the procedure is time consuming
Solution Approach 1:
The device performs preliminary loop formation during the initial puncture action. The loop structure is pre-formed and positioned ready to capture the implant in a single action, eliminating the need for sequential stitching steps and significantly reducing surgery time while maintaining proper stitching quality
Solution Approach 2:
The patent enables continuous action where the puncture, loop formation, and implant capture occur in an uninterrupted sequence. The stitching member maintains continuous engagement with the tissue and implant throughout the process, eliminating idle time between discrete stitching operations
Data Source
AI summary
An annuloplasty stitching device (1) is disclosed for stitching at a stitch site in a patient. The stitching device comprises a support structure (2) comprising, an elongate center support (21) extending along an axial direction (27) between a proximal end and a distal end, a stitching arrangement (3) comprising, at least one elongate linkage section (31) being movably attached at a support end (25) of the linkage section to the center support, and at least one stitching member (32) arranged at a stitch end (26) of the linkage section and being movable along said axial direction by a pivoting action of the linkage section.