Rotatable Biopsy Forceps Actuation to Prevent Trigger Blocking
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Solution Overview
Problem
Existing surgical devices for biopsy, such as forceps, often experience undesirable blocking of the actuation mechanism and require difficult adjustments in orientation, particularly when used with instruments like anoscopes and rectoscopes.
Innovation Solution
A surgical device with a rotatable external element and biopsy forceps, featuring a cam-actuated mechanism that prevents misalignment and blocking, allowing easy orientation adjustment through a handle-activated actuation system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a trigger actuation mechanism is used in surgical forceps, then the forceps can be actuated to remove tissue, but the mechanism may block due to forces applied in unwanted directions
Solution Approach 1:
The external element is made rotatable about its main axis of extension, transforming a static structure into a dynamic one. This rotational freedom allows the forceps to self-adjust their orientation relative to the cavity walls, preventing the actuation mechanism from blocking while maintaining ease of operation. The dynamic adjustment occurs automatically during insertion and operation.
2Device complexity
If the forceps orientation is fixed relative to the external element, then the structure is simpler, but the orientation cannot be easily adjusted for different cavity configurations
Solution Approach 1:
The external element's rotatability about its main axis provides continuous orientation adjustment capability without adding complex mechanical adjustment mechanisms. The forceps rotate together with the external element, maintaining a simple fixed relative mounting while achieving versatile absolute orientation through the external element's rotation.
Solution Approach 2:
The rotatable external element serves multiple functions: it acts as both the insertion tool and the orientation adjustment mechanism. By rotating the external element about its main axis, the forceps can be oriented in any direction needed for different cavity configurations, making the device universally adaptable without adding separate adjustment components.
3Reliability
If the external element is non-rotatable, then the actuation mechanism is less prone to blocking, but the forceps cannot be easily reoriented during use
Solution Approach 1:
The external element rotates freely about its main axis without interfering with the linear actuation mechanism. The rotational degree of freedom is decoupled from the actuation direction, allowing the forceps to be reoriented easily by rotating the external element while the actuation mechanism remains reliable and free from blocking issues.
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
Prevents actuation mechanism blocking and facilitates easy orientation adjustment of the forceps, ensuring reliable tissue sampling without mechanical interference.
Implementation Method 1
a return spring connected to a proximal end of the main structure and configured to bring the main structure back from the distanced position to the rest position
Implementation Method 2
the trigger has a through hole shaped like a cam and pivoted on the pin of the main structure of the actuation mechanism
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
A surgical device (1) for biopsy comprising an external structure (2) having a handle (21), which is disposed in a proximal portion (2p) of the external structure (2) and may be gripped by a user, an external element (3) insertable, during use, into a cavity, biopsy forceps (4) retained by the external element (3), an actuation mechanism (5) for the forceps (4), disposed inside the external structure (2), and a trigger (6) pivoted and solidly joined to the external structure (2) and engaged with the actuation mechanism (5). A main structure (51) of the actuation mechanism (5) comprises a pin (58) and the trigger (6) has a through hole (61) shaped like a cam and pivoted on the pin (58) of the main structure of the actuation mechanism (5).