Pelvic Support Device with Ischial Gap for Traction Stability
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Solution Overview
Problem
Current pelvic support devices cause pressure damage and tilting of the pelvis during lower extremity distraction procedures, leading to complications such as sensory disturbances, functional disorders, and postoperative pain due to direct pressure on sensitive tissues and nerves.
Innovation Solution
A pelvic support device that absorbs tensile stress via the ischial tuberosities, using a support part that distributes pressure through the skin and underlying tissue, avoiding direct contact with sensitive areas, and includes additional support devices to prevent tilting and slipping, designed to be non-invasive and suitable for various imaging methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a post is used to absorb counter-pressure on the pelvis during lower extremity distraction, then the tensile stress can be counteracted, but pressure damage occurs to soft tissues and nerves in the area between the ischial tuberosities
Solution Approach 1:
The support part is designed with differentiated contact zones: a first contact zone that extends between the ischial tuberosities without pressing on them, and a second contact zone that provides support in the area of the pubic symphysis. This local differentiation allows the device to absorb counter-pressure while avoiding pressure damage to sensitive soft tissues and nerves in the perineal region.
Solution Approach 2:
The support part is divided into functionally distinct segments: a first support region that spans between the ischial tuberosities without direct contact, and a second support region that contacts the pubic symphysis area. This segmentation allows independent optimization of each zone - the first zone avoids harmful pressure while the second zone provides necessary counter-pressure support.
2Stability of the object's composition
If the pubic symphysis is pressed hard against the post to prevent pelvis tilting, then pelvic stability is improved, but additional pressure damage occurs to soft tissues and nerves
Solution Approach 1:
The support part acts as an intermediary structure that distributes counter-pressure forces across multiple pelvic landmarks (ischial tuberosities and pubic symphysis area) rather than concentrating force on a single post. This intermediary design provides pelvic stability while dispersing pressure away from sensitive soft tissues and nerves in the perineal region.
Solution Approach 2:
The support part extends in multiple spatial dimensions - spanning between the ischial tuberosities in the transverse direction and providing support in the pubic symphysis area in the anterior direction. This multi-dimensional support configuration stabilizes the pelvis without requiring direct posterior pressure on sensitive tissues.
3Ease of manufacture
If a round post with various diameters and padding is used, then some pressure distribution is achieved, but pressure damage and tilting complications still occur
Solution Approach 1:
The support part is designed to adapt dynamically to the patient's anatomy, extending flexibly between the ischial tuberosities and providing support in the pubic symphysis area. This dynamic configuration allows the device to accommodate variations in pelvic geometry while maintaining optimal pressure distribution and preventing tilting, overcoming the limitations of fixed-diameter round posts.
Data Source
Figure 1~4
Figure 5~12
Figure 13~19
AI summary
The device has a support piece (13) that is formed such that force caused by tensile stress does not act at a location of a path of a nerve over an inner side of ischial protuberances (8) or a lower pubic bone (21) of pelvis of a person, where the tensile stress is initiated at a lower extremity i.e. thigh, and received over the support piece at the ischial protuberances of the pelvis. The support piece is configured such that centering of the pelvis takes place by the tensile stress in a direction transverse to the tensile stress. An independent claim is also included for a method for distracting a lower extremity.