Stylet Pulling Mechanism for Radioactive Seed Implantation
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Solution Overview
Problem
Current radioactive source implantation systems face challenges such as manual intervention exposing doctors to radiation, complex connection structures leading to tissue damage, and issues with stylet removal causing blood clotting and needle blockages during seed implantation surgeries.
Innovation Solution
A radioactive source delivery system with a stylet pulling mechanism that docks with the stylet inside a flexible delivery tube, using a friction-based mechanism to pull out the stylet and create a hollow channel for seed implantation, incorporating a flexible pushing wire and wire driving mechanism to facilitate seed placement, and a seed embedding mechanism for precise seed strand formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual intervention is used to adjust the depth of seed implantation by pulling the needle trocar, then the implantation depth can be adjusted, but doctors are exposed to radiation
Solution Approach 1:
The patent replaces manual mechanical manipulation with an automated wire-driven mechanism. The needle trocar depth adjustment is achieved through wire pulling controlled by a wire driving mechanism, eliminating the need for doctors to manually pull the needle and thereby reducing radiation exposure while maintaining implantation depth control capability
Solution Approach 2:
The system enables self-adjusting depth control through the wire-driven mechanism that can be operated remotely or automatically, allowing the implantation system to adjust its own depth without requiring direct manual intervention in the radiation field
2Stability of the object's composition
If a rigid connection structure is used between the implantation device and puncture needle, then the connection is stable, but it easily scratches the patient and leads to a complex and bulky structure
Solution Approach 1:
The patent employs a flexible tube to connect the implantation device with the puncture needle, replacing the rigid connection structure. This flexible connection maintains stability while being gentle on patient tissue, avoiding scratches and damage associated with rigid components
Solution Approach 2:
The flexible tube allows dynamic adaptation to tissue contours and movement during the procedure, providing both stability and patient comfort by conforming to the anatomical structures rather than forcing a rigid connection
3Reliability
If the stylet is not removed before implantation to prevent blood clotting, then blood clotting is prevented, but the implantation system becomes complex and the operation time increases
Solution Approach 1:
The patent incorporates a stylet pulling mechanism that automatically removes the stylet at the appropriate time during the procedure. This preliminary action of stylet removal is integrated into the workflow, preventing blood clotting and needle blockage without requiring complex manual management or increasing overall operation time
Solution Approach 2:
The stylet pulling function is merged with the existing wire driving mechanism and implantation workflow. The stylet removal is combined with the seed delivery process, eliminating the need for separate stylet management steps and reducing overall system complexity while maintaining reliable prevention of needle blockage
4Object-affected harmful factors
If a flexible tube is used between the seed implantation device and puncture needle, then the connection is less damaging to tissue, but the connection structure becomes more complex
Solution Approach 1:
The flexible tube is integrated with the wire driving mechanism and stylet pulling system, serving multiple functions simultaneously: tissue-protective connection, wire transmission medium, and stylet removal pathway. This multi-functionality reduces the need for separate components, thereby limiting complexity growth despite the flexible connection design
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 system enables automatic stylet pulling and storage, reduces radiation exposure for medical professionals, minimizes blood clotting, and allows for multi-channel implantation with improved surgical efficiency and precision.
Implementation Method 1
A part of the friction stylet pulling component presses tightly against the stylet, so the needle stylet is pulled by the frictional force generated by the pressing
Data Source
AI summary
The invention discloses a radioactive source delivery system with a stylet pulling mechanism and its method of use. The wire driving mechanism is connected to the wire output channel, and the wire driving mechanism is used to drive the pushing wire to move back and forth along the wire output channel. A stylet pulling mechanism is located on one side of the front end of the wire output channel. Through the channel-switching mechanism, the wire output channel is docked with a flexible delivery tube. The front end of the flexible the delivery tube is connected to a puncture needle or has a quick connector for connecting to the puncture needle. The stylet pulling mechanism can dock with the tail portion of the flexible stylet inside the flexible delivery tube, pulling the flexible stylet out of the flexible delivery tube to form a hollow flexible delivery channel. A radioactive source feeding mechanism is used to place the radioactive source in front of the pushing wire. The wire driving mechanism drives the pushing wire forward, pushing the radioactive source through the wire output channel, flexible delivery tube, and into the puncture needle inserted in the target object, ultimately implanting it into the target object. This invention prevents blood from entering and clotting inside the puncture needle, reduces surgery time, achieves full automation, and improves the accuracy of the implantation position.