Heatable Blade for Soft Tissue Excision
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Solution Overview
Problem
Current methods for tonsillectomy and adenoidectomy procedures result in significant post-operative bleeding and patient discomfort due to the use of mechanically sharp blades, which lead to increased intra-operative blood loss and prolonged procedure times.
Innovation Solution
A system comprising a temperature controller, a flexible cable, and a handpiece with a heatable blade coated with a non-stick material, where the blade is supported by arms with thermal barriers to maintain temperatures below 50°C, minimizing thermal injury to adjacent tissue and using resistance-feedback or temperature-sensor based control for precise heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a mechanically sharp blade is used for tissue excision, then precise removal of tonsil and adenoid tissue is achieved, but heavy bleeding occurs from the underlying tissue bed
Solution Approach 1:
The patent combines mechanical excision with electrosurgical sealing in a single integrated blade system. The blade performs both cutting and hemostasis functions simultaneously, merging two separate surgical steps into one action to reduce bleeding while maintaining precision.
Solution Approach 2:
The surgical blade is designed to perform multiple functions: mechanical cutting of tissue and electrosurgical sealing of blood vessels. This multi-functional tool eliminates the need for separate instruments and procedures, addressing both precision removal and bleeding control.
2Object-generated harmful factors
If electrosurgery is used to staunch bleeding after mechanical excision, then intra-operative blood loss is reduced, but post-operative pain increases due to thermal injury spread
Solution Approach 1:
The electrosurgical energy is applied locally only at the cutting edge where vessels are severed, rather than spreading thermal energy across a broader area. This localized application seals blood vessels precisely at the incision site without causing widespread thermal injury to adjacent tissues and nerves.
Solution Approach 2:
The blade acts as an intermediary that delivers electrosurgical energy directly to the tissue-cutting interface. This controlled delivery mechanism ensures energy is applied only where needed (at the cut edge) rather than allowing uncontrolled thermal spread to surrounding tissues.
3Object-generated harmful factors
If electrosurgery is used for both excision and vessel sealing, then intra-operative blood loss is reduced, but post-operative pain increases due to thermal injury spread
Solution Approach 1:
The electrosurgical blade concentrates energy delivery at the precise location of tissue excision and vessel severance. This localized energy application achieves hemostasis without causing the widespread thermal injury that occurs with traditional electrosurgical methods, thereby reducing post-operative pain.
4Object-generated harmful factors
If bipolar electrode configuration is used for molecular disintegration and tissue heating, then bleeding and post-operative pain are reduced, but procedure time increases significantly
Solution Approach 1:
The blade is pre-heated to electrosurgical temperatures before tissue contact, and the electrosurgical circuit is pre-established. This preliminary preparation allows immediate cutting and sealing action without the prolonged heating time required by bipolar methods, thus reducing overall procedure time while maintaining reduced bleeding and pain benefits.
Solution Approach 2:
The electrosurgical blade maintains continuous energy delivery during the excision process, allowing simultaneous cutting and sealing in one continuous action. This eliminates the intermittent heating and cooling cycles of bipolar methods, significantly reducing procedure time while achieving the same hemostatic and pain-reduction effects.
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 approach reduces intra-operative and post-operative bleeding, minimizes tissue avulsion, and decreases post-operative pain by maintaining precise temperature control and minimizing thermal injury, thereby enhancing the efficiency and safety of the surgical procedure.
Implementation Method 1
a heatable blade to incise soft tissue and/or seal transected blood vessels
Implementation Method 2
a non-stick coating to minimize the avulsion of the sealing layer formed over transected blood vessels
Implementation Method 3
blade support arms with thermal barriers to maintain temperatures below 50°C, minimizing thermal injury
Data Source
AI summary
Disclosed is a soft tissue excision apparatus having a handle and an elongated blade support member extending from the handle. The distal end of blade support member includes a first thermally conductive blade support arm and a second thermally conductive blade support arm. An electrically heatable blade is supported at and electrically isolated from the distal ends of the two thermally conductive blade support arms. A first electrically conductive lead extends from the proximal end of the thermally conductive blade support member to a first blade heater contact pad. A second electrically conductive lead extends from the proximal end of the thermally conductive blade support member to a second blade heater contact pad. First and second electrically conductive flexible leads extend from the proximal end of the thermally conductive blade support member to a controller.