Perforating Trocar Grooved Rod Guide Pin Trajectory
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Solution Overview
Problem
Existing perforating trocars lack precision and safety when drilling bone due to their inability to be guided on a pin, leading to difficulties in reaching deep or small bone lesions, especially in obese patients, and increased risk of accidents in dense bone areas with organs and nerves nearby.
Innovation Solution
A perforating trocar design featuring a rigid outer sleeve and a mandrel with a grooved rod that allows sliding on a guide pin, equipped with a bevelled and sharpened distal end for enhanced penetration, and the option to transition from manual to automatic rotational drive for increased precision and power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a traditional perforating trocar is used without pin guidance, then the device structure is simple, but the precision and safety of bone penetration deteriorates
Solution Approach 1:
The patent introduces a guide pin as an intermediary element that temporarily guides the trocar through the soft tissue to the bone surface. The guide pin serves as a mediator between the practitioner's entry point and the target bone lesion, ensuring precise alignment before the actual bone penetration occurs. This resolves the contradiction by adding minimal structural complexity while dramatically improving precision.
Solution Approach 2:
The patent implements preliminary action by first inserting and positioning a guide pin before using the trocar for bone penetration. This preliminary guide pin placement establishes the precise trajectory and entry point before the main drilling operation, allowing the practitioner to achieve accurate bone targeting without requiring the trocar itself to be overly complex.
2Device complexity
If a manual insertion method is used for deep bone lesions, then the device remains simple, but the ability to maintain trajectory precision deteriorates
Solution Approach 1:
The guide pin acts as a mechanical intermediary that physically maintains the desired trajectory through deep soft tissue. By engaging the guide pin with the trocar's groove, the system ensures that even during manual insertion through 150-200mm of soft tissue, the trajectory remains within millimetre precision, solving the contradiction between device simplicity and trajectory maintenance.
Solution Approach 2:
The patent replaces the reliance on purely manual mechanical control with a hybrid system where the guide pin provides passive mechanical guidance. This substitution allows the practitioner to focus on insertion while the guide pin automatically maintains trajectory precision through its physical engagement with the trocar groove, achieving high precision without complex active control mechanisms.
3Object-affected harmful factors
If the trocar diameter is reduced for minimally invasive procedures, then tissue damage is reduced, but the difficulty of maintaining trajectory precision increases
Solution Approach 1:
The guide pin serves as a mediator that compensates for the reduced diameter of the trocar. By providing an external guidance reference, the system allows the smaller-diameter trocar to maintain trajectory precision that would otherwise be difficult to achieve, thus enabling minimally invasive procedures without sacrificing accuracy.
Solution Approach 2:
The patent substitutes active manual control with passive mechanical guidance through the guide pin. This replacement allows the smaller trocar diameter to overcome the natural difficulty of maintaining precision, as the guide pin's physical engagement with the trocar groove provides continuous trajectory correction throughout the insertion path.
4Adaptability or versatility
If percutaneous procedures are performed through dense bone zones with organs and nerves, then the procedure can be performed, but the risk of accidents increases
Solution Approach 1:
The patent implements preliminary action by first establishing a guide pin in the precise trajectory before attempting bone penetration through dense zones. This preliminary placement allows the practitioner to visualize and confirm the safety of the trajectory through imaging, and ensures that the trocar follows the pre-planned safe path, thereby performing the procedure while maintaining high safety standards.
Solution Approach 2:
The guide pin acts as a safety intermediary that mediates between the desired trajectory and the risks of dense bone zones. By providing a pre-established guidance reference, the system allows controlled penetration through challenging anatomical regions while maintaining reliability, as the guide pin ensures the trocar stays within the pre-verified safe trajectory throughout the procedure.
Data Source
AI summary
The invention relates to a device in the form of a perforating trocar and is intended in particular to be used for surgery and interventional radiology. The device comprises an outer sleeve (5) having a rigid tube (8), and a mandrel (6) having a rod (18). The rod (18) is suitable for sliding in the outer sleeve (5) and has, at its distal end, a perforating tip (21, 33). The rod (18) additionally has a longitudinal groove (20) arranged on the surface of the rod (18), and extending from the distal end to the proximal end of the rod (18), in order to allow the device to slide on a guide pin.