Sternal Retractor Blade with Tamponade Insert
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional sternal retractors cause excessive bleeding and sternal fractures during cardiac surgery due to uneven pressure distribution and lack of design to prevent bleeding, leading to increased blood transfusions and complications like neurocognitive decline and delayed healing.
Innovation Solution
The sternal retractor features blades that extend the length of the sternum, with inserts to tamponade bleeding and a trapezoidal opening mechanism to distribute force evenly, reducing pressure on the sternum and minimizing fractures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional sternal retractors with blades are used to pry apart the cut edges of the sternum, then the sternal opening is created to access the heart, but excessive bleeding occurs from the cut sternal edges and sternal fractures occur
Solution Approach 1:
The sternal retractor is divided into multiple components: a body portion, a blade portion with cutting edge, and a tamponade portion. This segmentation allows each component to perform its specific function - the blade creates the opening while the tamponade portion controls bleeding, resolving the contradiction between operational effectiveness and harmful side effects
Solution Approach 2:
The tamponade portion acts as an intermediary element between the blade and the cut sternal edges. It is positioned against the cut edges to apply pressure and control bleeding, mediating the interaction between the retractor and the sternum to reduce harmful bleeding effects while maintaining the opening function
2Force
If blades contact only the central region of the sternal edge to apply opening pressure, then the sternal opening is achieved, but large pressure on small surface area causes sternal fractures
Solution Approach 1:
The blade is extended in length along the sternal edge, transitioning from a point-contact or small-area contact to a line-contact or large-area contact. This dimensional extension distributes the opening force across a larger surface area of the sternal edge, reducing pressure concentration and preventing fractures while maintaining effective opening capability
3Productivity
If conventional retractors are used without bleeding control features, then the surgical procedure can proceed, but total blood loss exceeds one liter requiring transfusion
Solution Approach 1:
The sternal retractor merges multiple functions into a single device: the body portion provides structural support, the blade portion creates the sternal opening, and the tamponade portion controls bleeding from the cut edges. This integration allows the surgical procedure to proceed efficiently while simultaneously controlling blood loss, eliminating the need for separate bleeding control measures
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
This design significantly reduces bleeding and sternal fractures, minimizing blood transfusions and improving surgical outcomes by evenly distributing force and creating a trapezoidal opening that reduces pressure on the sternum.
Implementation Method 1
the blade includes a tamponade portion positioned against the cut sternal edge to reduce bleeding
Data Source
AI summary
Devices and methods for sternal retraction that reduces bleeding from the cut edges of a sternum and reduces fracturing of the sternum during retraction. The devices and methods involve the use of sternal retractor blades having a certain geometry and inserts placed inside the sternal retractor blades during retraction of the sternotomy incision. The blades and inserts act to tamponade the blood flow from the cut sternal edge and reduce fracturing of the sternum during retraction.