Circular Stapling Anvil with Integrated Wound Treatment Material
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Solution Overview
Problem
Current surgical stapling devices for circular anastomosis lack effective means to enhance tissue repair and joining, particularly in minimizing foreign body reactions and scarring, and in providing immediate hemostasis and tissue reinforcement during the procedure.
Innovation Solution
The anvil assembly for a circular stapling device incorporates a wound treatment material delivery system, where an adhesive, sealant, or hemostat is disposed within recesses or pockets of the anvil plate, released during stapling to promote tissue bonding and hemostasis, and includes a liner to contain the material, ensuring its application directly to the tissue interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If surgical staples are used for circular anastomosis, then tissue joining is achieved, but tissue strength and healing are insufficient
Solution Approach 1:
The patent combines surgical staples with wound treatment materials (adhesives, sealants, hemostats) in a single anvil assembly. The staples provide mechanical joining while the wound treatment materials provide chemical bonding and hemostasis, creating a composite repair system that addresses both mechanical strength and biological healing requirements simultaneously.
Solution Approach 2:
The anvil assembly integrates multiple functional materials: biocompatible adhesives (e.g., cyanoacrylate, protein-based), sealants (e.g., fibrin, collagen-based), and hemostatic agents (e.g., fibrinogen-thrombin, gelatin-based). These composite materials work together to provide enhanced tissue joining, sealing, and hemostasis that exceeds staple alone capabilities.
2Strength
If adhesive materials are applied to tissue interface, then tissue bonding is enhanced, but foreign body reaction and scarring increase
Solution Approach 1:
The patent employs biocompatible, absorbable adhesive materials that degrade naturally in the body. The adhesives are designed to provide temporary bonding during healing, then disappear through absorption, eliminating permanent foreign bodies. Examples include protein-based adhesives and fibrin-based materials that are metabolically active and non-permanent.
Solution Approach 2:
The adhesive materials are formulated with specific chemical parameters to optimize biocompatibility. The materials undergo controlled degradation through hydrolysis and enzymatic breakdown, changing their physical and chemical properties over time from bonded state to absorbed state, thereby maintaining strength during healing while minimizing long-term foreign body reactions.
3Reliability
If wound treatment material is applied manually, then tissue repair is enhanced, but procedure time and complexity increase
Solution Approach 1:
The wound treatment materials are pre-loaded into the anvil assembly during manufacturing. The adhesives, sealants, and hemostats are positioned in predetermined locations within the anvil, ready for immediate deployment during the surgical procedure. This eliminates the need for manual preparation and application steps during surgery.
Solution Approach 2:
The anvil assembly is designed to automatically dispense wound treatment materials during the stapling process. As the anvil compresses against the tissue, the materials are released through built-in delivery mechanisms, requiring no separate application steps. The system performs both mechanical stapling and chemical wound treatment through a single integrated action.
4Adaptability or versatility
If multiple separate components are used for stapling and wound treatment, then functional requirements are met, but device complexity increases
Solution Approach 1:
The patent integrates the anvil, staple cartridge, and wound treatment material delivery system into a single unified anvil assembly. The anvil head incorporates recesses and channels that simultaneously hold staples, adhesives, sealants, and hemostats, allowing all components to be delivered and deployed through one surgical instrument rather than multiple separate devices.
Solution Approach 2:
The anvil assembly serves multiple functions: mechanical compression for staple driving, chemical adhesive application, sealant deployment, and hemostat activation. The single anvil structure performs what would traditionally require separate stapling instruments, adhesive applicators, and hemostatic devices, thereby reducing overall device complexity while maintaining comprehensive functional requirements.
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 solution enhances tissue strength, reduces bleeding, and minimizes foreign body reactions by applying wound treatment materials directly to the anastomosis site, improving the healing process and mechanical integrity of the tissue junction.
Implementation Method 1
biological tissue adhesives. Biological adhesives generally bond separated tissues together to aid in the healing process and to enhance the tissue strength
Implementation Method 2
applying (e.g., by spraying, brushing, etc.) an adhesive material and/or a sealant material to the external surface of the target surgical site
Implementation Method 3
The wound treatment material may be a hemostat... The hemostat material may include a fibrin-based material, a collagen-based material, an oxidized regenerated cellulose-based material, a gelatin-based material and/or a fibrinogen-thrombin material
Data Source
AI summary
An anvil assembly for a circular stapling device includes an anvil head configured to support an anvil plate thereon, a shaft extending from the anvil head and configured to selectively engage a rod member of the circular stapling device, an anvil plate operatively connected to the anvil head, wherein the anvil plate includes an inner diametral edge, and wherein the anvil plate defines a plurality of staple forming pockets therein at a location radially outward of the inner diametral edge, a recess formed in the anvil head, wherein the recess is defined by the inner diametral edge of the anvil plate and a rear surface of the anvil head, and a wound treatment material disposed substantially within the recess.