Trocar Needle Grip Structure to Prevent Rotation During Insertion
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Solution Overview
Problem
Existing trocar needles are difficult to grip, prone to rotation, and can cause damage due to their metallic cylindrical shape, leading to potential misinsertion and complications during surgical procedures.
Innovation Solution
A trocar instrument with a fastening groove on its outer surface and an auxiliary device featuring a hook and body configuration that prevents rotation, allows one-handed removal, and provides ergonomic grip and symmetrical structure for stable support and accurate bending direction recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metallic cylindrical trocar needle is used, then the needle can be manufactured with high precision and strength, but it becomes difficult to grip and prone to rotation during penetration
Solution Approach 1:
The trocar needle is segmented into a cylindrical body portion and a separate grip portion with a non-circular cross-section. The grip portion features a polygonal or irregular shape with flattened sides or ridges that provide finger engagement surfaces, while the cylindrical body maintains manufacturing precision and structural integrity. This segmentation allows each part to optimize its form for its specific function.
Solution Approach 2:
The needle applies local quality by providing different cross-sectional geometries at different locations. The distal portion maintains a smooth cylindrical shape for precise manufacturing and penetration, while the proximal grip portion features non-circular geometry with flattened areas or ridges specifically designed for finger contact and torque application, creating localized functional zones.
2Ease of operation
If the trocar needle is made bendable by 20-30 degrees for convenience, then the needle can be guided more easily, but the sharp tip may slide and rotate causing damage to organs, blood vessels and nerves
Solution Approach 1:
The grip portion employs asymmetric or non-circular geometry with flattened sides or irregular contours that prevent rotational movement. This asymmetric shape creates a unique orientation that must be maintained during insertion, preventing the sharp tip from rotating and potentially damaging surrounding tissues while still allowing the needle to bend for guidance.
3Ease of operation
If a handle portion is formed around the trocar needle to increase frictional force, then grip ability is improved, but the device complexity increases
Solution Approach 1:
The grip portion is merged with the needle body as a single integrated component rather than a separate handle attachment. The non-circular cross-section is formed directly as part of the needle manufacturing process, combining the structural function of the needle with the gripping function in one unified element, thereby improving grip without significantly increasing device complexity.
4Adaptability or versatility
If a detachable fixing handle is coupled to a coupling portion inside the rear end of the trocar needle, then the handle can be removed, but the problems of guiding and penetrating the desired site are not completely solved
Solution Approach 1:
The grip portion is pre-formed as an integral part of the needle during manufacturing, with the optimal non-circular geometry already in place before use. This preliminary formation ensures consistent guidance control and prevents rotation from the outset, eliminating the need for separate coupling mechanisms while maintaining adaptability through the removable 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 solution enables stable grip and control of the trocar needle, preventing rotation and misinsertion, facilitating easy surgical procedures with minimal force and reducing the risk of organ, blood vessel, and nerve damage.
Implementation Method 1
a trocar instrument capable of being kept against rotation during use
Implementation Method 2
a trocar instrument having a configuration capable of applying not only a frictional force but also a push/pull force to the contact surfaces of the gripping fingers
Data Source
AI summary
An auxiliary device for use in a trocar instrument, including a trocar needle having a fastening groove formed on an outer circumferential surface thereof. The auxiliary device includes: a body into which at least a portion of the trocar needle is inserted; and a hook connected to the body and configured to be inserted into the fastening groove of the trocar needle. The hook includes a fixing portion fixed to the body and a coupling portion extending from one end of the fixing portion and configured to be inserted into the fastening groove when the trocar needle is disposed inside the body. A gap is formed between the fixing portion and the coupling portion.