One-Time Expandable Balloon Speculum for Uniform Wall Retraction
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Solution Overview
Problem
Traditional specula are inadequate for providing a clear view during pelvic examinations, particularly in multiparous, obese, or patients with pelvic organ prolapse, due to insufficient lateral retraction of vaginal walls, and may transmit infections due to inadequate sterilization, causing discomfort and missed diagnoses.
Innovation Solution
A one-time use expandable speculum with inner and outer balloon layers that expand circumferentially, featuring a shape memory alloy layer that transitions with heat, allowing for uniform pressure distribution and illumination, and preventing tissue contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional metal or hard plastic specula are used, then the speculum is durable and can be sterilized, but it causes patient discomfort, pain, and coldness during examination
Solution Approach 1:
The patent replaces traditional rigid metal or hard plastic specula with a flexible balloon construct made of soft material layers. The balloon can be inflated to the required size during the examination, providing a comfortable flexible interface with the patient's tissues while maintaining the ability to be sterilized between uses.
Solution Approach 2:
The speculum's physical parameters (size, shape, rigidity) are changed dynamically. The balloon starts collapsed for insertion and then inflates to the required diameter and shape during the examination, allowing the same device to adapt to different patient anatomies and examination requirements while maintaining comfort throughout.
2Device complexity
If traditional billed specula are used, then the speculum structure is simple, but it does not retract vaginal walls laterally causing visualization problems in multiparous, obese, or patients with pelvic organ prolapse
Solution Approach 1:
The patent employs a dynamic balloon structure that can expand circumferentially to apply uniform radial pressure against the vaginal walls, causing them to retract laterally. This dynamic expansion capability allows the speculum to adapt to different vaginal anatomies and create optimal visualization conditions without the complexity of multiple rigid bills or blades.
Solution Approach 2:
The balloon's curved, circumferential expansion creates uniform pressure distribution around the vaginal canal, causing lateral retraction of the walls. This spherical expansion geometry is more effective at creating a clear view compared to the linear pressure application of traditional billed specula.
3Ease of operation
If traditional double billed specula are used, then the speculum provides adequate wall retraction, but it is painful and uncomfortable for patients due to cold, rigid, large size, and clicking during use
Solution Approach 1:
The patent replaces the rigid, clicking bills of traditional specula with a flexible, compliant balloon made of soft material. The balloon's flexible nature eliminates the clicking sound and provides a comfortable, non-painful interface with the patient's tissues while maintaining adequate wall retraction through its inflatable design.
Solution Approach 2:
The speculum transitions from a collapsed, flexible state during insertion to an inflated, firm state during examination. This parameter change allows the balloon to provide adequate wall retraction when needed while remaining comfortable during insertion and throughout the procedure, eliminating the pain and clicking associated with rigid traditional specula.
4Ease of manufacture
If traditional specula are used throughout the world, then they are cost-effective and durable, but they may not be sufficiently cleaned or sterilized between patients resulting in spread of HPV, HIV, and other infections
Solution Approach 1:
The patent describes a one-time use speculum that is discarded after a single examination. This eliminates the need for cleaning and sterilization between patients, completely preventing the transmission of HPV, HIV, and other infections. The disposable nature also keeps the device cost-effective for widespread use in resource-limited settings.
5Strength
If traditional metal specula are used for LEEP procedure, then the speculum provides structural support, but it cannot be used with hot wire loop due to heat conduction and requires specially coated speculum which is costly
Solution Approach 1:
The patent employs a flexible balloon construct that does not conduct heat like metal. This allows the use of standard, cost-effective materials without requiring expensive heat-resistant coatings or special metal alloys, while still providing adequate structural support through the inflated balloon configuration.
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 expandable speculum provides a comfortable, infection-free, and clear view of the cervix, even in challenging anatomical conditions, reducing patient discomfort and enhancing examination efficacy.
Implementation Method 1
The speculum further includes a shape memory alloy layer within the outer balloon layer configured to transition to a first shape when heated above a transition temperature
Implementation Method 2
The speculum includes an access tube for injecting the liquid into the cavity
Data Source
AI summary
Expandable specula devices and methods are disclosed. In one aspect, a speculum includes inner and outer balloon layers configured to expand circumferentially. The inner and outer balloon layers form a sealed cavity configured to hold a liquid. The speculum further includes an access tube for injecting the liquid into the cavity. The speculum further includes a shape memory alloy layer within the outer balloon layer. The shape memory alloy layer is configured to transition to a first shape when heated above a transition temperature.