Blood Flow Restrictor With Threaded Bolt and Elastic Loop
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Solution Overview
Problem
Conventional methods for restricting blood flow during laparoscopic surgery, such as the Pringle maneuver, are labor-intensive and time-consuming due to the need for repeated clamping and re-location of the portal triad, and are limited by the restricted working space in laparoscopic procedures.
Innovation Solution
A medical device comprising a cylindrical restrictor with a threaded inner surface and a protrusion, coupled with an elastic strip and a bolt, allows for adjustable and quick restriction of blood flow by forming a loop around the area of interest, which can be tightened and secured using the bolt, eliminating the need for additional incisions and reducing the complexity of the procedure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional Pringle manoeuvre is used with laparoscope, then blood flow restriction is achieved, but additional incision is required and working space is limited
Solution Approach 1:
The device separates the clamping function from the positioning function by using a distinct clamp body with jaws that can be independently positioned and secured, allowing the portal triad to be clamped without requiring additional incisions for haemostate insertion
Solution Approach 2:
The clamp body and jaws are designed as nested components where the jaws fit within the clamp body structure, allowing compact storage and easy manipulation through limited incisions while maintaining effective clamping capability
2Reliability
If haemostate is repeatedly clamped and released, then blood flow control is maintained, but procedure becomes labor-intensive and time-consuming
Solution Approach 1:
The portal triad is clamped once using the device, and the clamp can be maintained in position without repeated re-location, as the device design allows stable positioning and secure clamping that persists throughout the surgical procedure
Solution Approach 2:
The clamp incorporates adjustable components including the bolt mechanism that allows dynamic adjustment of clamping force and position, enabling the surgeon to optimize blood flow control for different surgical stages without re-positioning the entire device
3Reliability
If additional incision is made for haemostate insertion, then blood flow restriction is achieved, but wound size increases and infection risk rises
Solution Approach 1:
The device is designed to perform multiple functions through a single incision: positioning, clamping, and securing of the portal triad, eliminating the need for separate haemostate insertion incisions and thereby reducing overall incision count and associated infection risks
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 device simplifies blood flow restriction, allowing for real-time adjustment and reducing the time and effort required during surgical procedures, enhancing the efficiency and minimizing the need for additional abdominal incisions, thus improving surgical outcomes.
Implementation Method 1
The strip is preferably made of elastic material and is coupled to the protrusion of the restrictor at one end, while allowing the other end (i.e., the free end) to circumvent the area before passing through the passage of the cylindrical body to form a loop that can be tightened to restrict the blood flow
Implementation Method 2
The bolt has a head and a threaded shaft, wherein the bolt is capable of being driven into the cylindrical body through the open end to engage the threaded shaft of the bolt with the threaded inner surface of the cylindrical body until the end of the threaded shaft of the bolt is held against the strip so as to hold the loop in place
Data Source
AI summary
Disclosed herein are methods and devices forrestricting the blood flow of an area in a subject. The device includes a restrictor, a bolt and a strip. The restrictor includes a cylindrical body having one open end, one closed end, and a passage therethrough, in which the inner surface of the cylindrical body towards the open end is threaded; and a protrusion disposed on the outer surface of the closed end of the body. The strip is preferably made of an elastic material and is coupled to the protrusion of the restrictor at one end, while allowing the other end (i.e., the free end) to circumvent the area before passing through the passage of the cylindrical body to form a loop that can be tightened to restrict the blood flow of the area in the subject. The bolt has a head and a threaded shaft, wherein the bolt is capable of being driven into the cylindrical body through the open end to engage the threaded shaft of the bolt with the threaded inner surface of the cylindrical body until the end of the threaded shaft of the bolt is held against the strip so as to hold the loop in place and thereby restricting the blood flow of the area.