Trocar Cannula with Slanted Tip and Linear Blade
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Solution Overview
Problem
Conventional trocars require significant time to close incisional wounds due to valve-shaped incision sections, and the process of screwing cannula portions into tissues can cause tissue damage and prolonged healing.
Innovation Solution
The trocar design features a cannula portion with a slanting cut end and a detachable incision member with a nearly straight-line cutting blade, allowing for easy penetration and self-sealing of incisional wounds without screwing, reducing tissue damage and healing time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cannula portion is screwed into the tissue to ensure penetration, then the penetration reliability is improved, but the tissue is damaged by dissection and healing time increases
Solution Approach 1:
The cannula tip geometry is changed from a conventional design to a specific angled configuration (with the tip surface forming an angle of 30-60 degrees with the longitudinal axis). This parameter change allows the cannula to penetrate tissue through controlled incision rather than screwing, eliminating tissue dissection damage while maintaining reliable penetration.
2Ease of operation
If conventional incision instruments with triangular or semicircular cutting blades are used, then the cannula can be inserted into the incised site, but valve-shaped incision sections are formed that require significant time to close
Solution Approach 1:
The cutting blade is designed with an asymmetric linear configuration rather than symmetric triangular or semicircular shapes. The blade has a specific geometry where the tip surface forms a controlled angle with the longitudinal axis, creating a linear incision that does not form valve-shaped sections, thereby enabling rapid wound closure while maintaining ease of cannula insertion.
3Ease of manufacture
If the cutting blade has a triangular or semicircular shape, then the incision instrument can effectively cut the tissue, but the resulting valve-shaped incision sections prevent quick sealing
Solution Approach 1:
The cutting blade employs an asymmetric linear design with specific angular geometry (tip surface at 30-60 degrees to the longitudinal axis) rather than symmetric triangular or semicircular shapes. This asymmetric configuration achieves effective tissue incision while creating a linear wound tract that seals quickly without forming valve-shaped sections that delay closure.
4Ease of manufacture
If the cannula tip is cut at a right angle to the shaft line, then the manufacturing is simple, but the cannula must be screwed into the tissue causing dissection damage
Solution Approach 1:
The cannula tip cutting angle is changed from a right angle (90 degrees) to a controlled angle range (30-60 degrees) relative to the longitudinal axis. This parameter modification enables the cannula to penetrate tissue through a controlled linear incision mechanism rather than requiring screwing motion, thereby eliminating tissue dissection while maintaining manufacturing simplicity.
Data Source
Figure 1A
Figure 1B
Figure 2A
AI summary
The invention provides a trocar (D) for penetrating body tissue and being placed, which allows for shortening the time required to seal an opening, regardless of the size of the opening. In a first trocar used in performing surgery, an incision member (A) is detachably inserted into the cannula portion (10) and a cutting blade (2) with a shape of a nearly straight line is formed at the tip. In a second trocar, the tip part of the cannula portion that detachably inserts the incision member has a slanting cut end (12), and the slanting cut end is formed in a tapered shape.