Radially Folded Hemostatic Discs for Minimally Invasive Surgery
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Solution Overview
Problem
Current hemostatic solutions for minimally invasive surgeries, such as fibrin glue and collagen-based nonwovens, face challenges in effectively controlling heavy bleeding due to adhesion issues and difficulty in deployment through small trocars, leading to inadequate sealing and potential washing away of the adhesive.
Innovation Solution
Development of flat, disc-shaped hemostyptic materials with a diameter greater than the trocar, featuring radial structures like incisions or embossing that allow easy deployment and expansion, enabling efficient coverage of wound areas without gaps, and a porous structure for high absorption capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If large-area hemostyptic material is used to ensure complete wound coverage, then hemostatic effectiveness is improved, but difficulty in dispensing through trocar increases
Solution Approach 1:
The hemostyptic material is divided into multiple individual discs, each designed to be dispensed separately through the trocar. This segmentation allows large total coverage area while maintaining ease of delivery through small access points.
Solution Approach 2:
The hemostyptic discs are designed with foldable radial structures that enable them to be compressed into a compact, trocar-compatible configuration for delivery, then expanded to full diameter for effective wound coverage. This dimensional transformation resolves the contradiction between large area and small delivery aperture.
2Ease of operation
If hemostyptic material is rolled up for trocar insertion, then ease of dispensing is improved, but unrolling difficulty and sticking together worsen
Solution Approach 1:
Instead of using a single rolled fleece that must be unrolled and manipulated, the invention provides multiple pre-formed discs that are individually dispensed. This eliminates the unrolling step and associated sticking problems while maintaining ease of dispensing through the trocar.
Solution Approach 2:
The hemostyptic discs are pre-formed with radial folds during manufacturing, creating a compact, self-contained structure ready for immediate dispensing. This preliminary shaping eliminates the need for intraoperative unrolling and manipulation, reducing complexity and sticking issues.
3Reliability
If multiple fleece layers are applied to control severe bleeding, then hemostatic effectiveness is improved, but placement time and complexity increase
Solution Approach 1:
The system provides multiple individual discs that can be rapidly dispensed and stacked at the wound site. This segmented approach allows efficient layering to achieve severe bleeding control without the time-consuming manipulation required by traditional rolled fleeces.
Solution Approach 2:
The radial fold structures on the discs are self-aligning features that automatically orient the material correctly during placement. This self-service mechanism eliminates the need for precise manual positioning and alignment, reducing placement time while maintaining effective multi-layer coverage.
4Ease of operation
If small hemostyptic pieces are used to ease trocar dispensing, then ease of operation is improved, but hemostatic effectiveness deteriorates due to gaps
Solution Approach 1:
The discs are designed with radial folds that enable them to be compressed to trocar-compatible sizes for easy dispensing, then expanded to large diameters for effective wound coverage. This dimensional transformation allows each disc to provide adequate coverage area without compromising dispensing ease.
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 provides effective hemostasis by ensuring complete wound coverage and rapid absorption of body fluids, significantly reducing bleeding time and improving the ease of placement and handling during minimally invasive procedures.
Implementation Method 1
The porous material of the hemostyptic advantageously has a pore volume of >90% by volume, in particular in the range from 96 to 99% by volume
Implementation Method 2
The pore size of the hemostyptic is preferably less than 500 μm, in particular less than 300 μm, preferably less than 100 μm. The small pore size of the hemostyptic enables greater capillary forces to occur, resulting in a greater absorption capacity for liquids, in particular body liquids
Data Source
Figure 1~5
Figure 3~4
AI summary
The invention relates to a hemostatic agent for minimally invasive surgery, particularly in the abdominal cavity, in the form of an absorbent disc (11) made of porous biodegradable material with a center and a radial extension of at least 10 mm from the center, wherein the disc is designed such that it can be transformed into a radially tapered intermediate state with a substantially rotationally symmetrical tapered radius, into which it can be inserted into the body through a tube (15) and from which it can be transformed back into the planar state.