Tourniquet with Mechanical Pressure Dial and Spring Feedback
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Solution Overview
Problem
Existing tourniquets lack accurate pressure display and easy adjustment, making it difficult for medical staff to maintain stable hemostasis during procedures.
Innovation Solution
A tourniquet with a fixing module, hemostatic module, and indication module, featuring a rotating knob, threaded pressure stud, floating nut, spinning press block, spring, pointer, and dial, allowing for precise pressure adjustment and display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a tourniquet without pressure display is used, then the structure is simpler, but the pressure value cannot be observed and adjusted accurately
Solution Approach 1:
The patent replaces complex electronic pressure sensing systems with a simple mechanical spring-based indication mechanism. The spring compresses under pressure and drives a pointer to rotate on a dial, providing visual pressure feedback without requiring power sources, sensors, or electronic displays. This mechanical substitution achieves accurate pressure measurement while keeping the device structure simple and reliable.
Solution Approach 2:
The patent uses visual changes in the pointer position on the dial to indicate pressure values. As the spring compresses under increasing pressure, the pointer rotates to different positions on the calibrated dial face, providing clear visual feedback about the applied pressure. This visual indication method allows medical staff to easily observe and adjust pressure without complex electronic interfaces.
2Reliability
If manual pressure is applied to stop bleeding, then the tourniquet structure is simpler, but the implementation force is unstable and hemostasis fails
Solution Approach 1:
The patent incorporates a feedback mechanism where the spring compression distance (which reflects the applied pressure) is visually indicated by the pointer position on the dial. This real-time feedback allows medical staff to adjust the pressure applied by the tourniquet to achieve and maintain stable hemostasis. The feedback loop enables precise pressure control, ensuring reliable bleeding control while reducing the need for repeated adjustment.
3Reliability
If pressure is increased to ensure hemostasis, then the bleeding control is more effective, but the patient experiences more pain
Solution Approach 1:
The patent enables dynamic pressure adjustment through the threaded connection between the adjustment nut and the pressure application component. Medical staff can rotate the adjustment nut to increase or decrease the pressure in controlled increments. This dynamic control allows optimization of pressure to achieve effective hemostasis while minimizing excessive pressure that would cause patient pain. The spring mechanism provides progressive resistance, making pressure adjustment smoother and more comfortable for the patient.
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 tourniquet provides accurate and visible pressure display, enabling precise control and reducing the labor intensity of medical staff, while ensuring effective hemostasis.
Implementation Method 1
a spring (9), with the upper end of the spring abutting against a top inner surface of the protrusion (3), and the lower end of the spring abutting against the upper end of the spinning press block (8)
Implementation Method 2
the upper part of the pressure stud (5) is threadedly connected with the knob (4), and the lower end of the pressure stud (5) is fixedly connected with the hemostatic pad (6), and the pressure stud threadedly matched with the knob moves downward by rotating the knob (4)
Implementation Method 3
the floating nut (7) is arranged around the pressure stud (5), the upper end thereof being fixedly connected with the knob (4), and the lower end thereof being provided with a supporting part
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
Disclosed is a tourniquet, comprising a fixing module, a hemostasis module, and an indication module, wherein the indicating module includes a floating nut, a spinning press block, a spring, a connecting piece, a pointer and a dial. A floating nut is arranged around a pressure stud, with the upper end of the floating nut being fixedly connected to a rotary knob, and the lower end of the floating nut being provided with a support part; the spinning press block is arranged around the floating nut, with an inner side of the spinning press block abutting against the floating nut, an outer side of the spinning press block being in thread-fit connection with an inner side of a protrusion, and the lower end of the spinning press block being supported by the support part; the spinning press block is provided with a holding hole penetrating through from top to bottom; the spring is sheathed outside the floating nut, with the upper end of the spring abutting against the top face of the protrusion, and the lower end thereof abutting against the upper end of the spinning press block; the connecting piece is disposed in the holding hole; the connecting piece does not rise along with the spinning press block, but rotates along with the spinning press block, and the lower end of the connecting piece is fixedly connected to the pointer; and the pointer rotates along with the connecting piece to point to different pressure values on the dial plate. The present invention is simple in terms of structure and easy to process, easier to observation of the value of applied pressure, and has higher precise.