Adjustable Cutting Wire for Precise Tumor Resection
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Solution Overview
Problem
Current medical instruments are inadequate for the precise removal of small tumors, such as mammary tumors, as they fail to maintain the original shape and structure of the tumor during removal, and often cause damage to surrounding healthy tissue.
Innovation Solution
A medical instrument featuring a hollow needle with a cutting wire and guide element that allows for adjustable cutting loops, enabling precise removal of tumors with imaging guidance, minimizing damage to healthy tissue and allowing for bipolar use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If vacuum biopsy is used to remove tumors, then tumor material can be removed from the body, but the tumor is cut up and suctioned out in small fractions making it impossible to precisely examine resection margins
Solution Approach 1:
The device segments the tumor removal process into distinct phases: positioning the hollow needle at the tumor site, deploying the cutting wire to encircle the tumor, and maintaining the tumor in its original form within the hollow needle for complete removal. This segmentation allows both efficient removal and preservation of tumor integrity for precise pathological examination of resection margins.
2Manufacturing precision
If open biopsy is used to remove tumors completely in original form, then resection margins can be precisely examined, but the procedure cannot be performed minimally invasively
Solution Approach 1:
The device employs a nested structure where the cutting wire is positioned within the hollow needle, and the tumor is captured inside the hollow needle's interior space. This nesting allows the entire tumor to be removed minimally invasively through a small incision while maintaining its original form for precise resection margin examination, combining the benefits of both open and minimally invasive approaches.
3Ease of operation
If existing biopsy devices are used on small tumors, then the procedure can be performed, but the original shape and structure of the tumor cannot be maintained during removal
Solution Approach 1:
The device performs preliminary action by positioning the hollow needle and cutting wire around the tumor before the cutting process begins. The cutting wire is deployed to encircle the tumor, and the hollow needle is positioned to receive the tumor in its original form. This preliminary positioning ensures that the tumor's shape and structure are maintained throughout the removal process, enabling precise pathological examination of resection margins.
Data Source
Figure 1~2
Figure 3
AI summary
A medical instrument (1) for minimally invasive removal of biological material from a human or animal body is described, with a hollow needle (2) which, at a distal end (4) delimiting an interior (3) of the hollow needle (2), has a peripheral border (5), which at least in part has a cutting edge, and with a cutting wire (6) which is arranged in such a way that the cutting wire (6) is movable, relative to the hollow needle (2), at least in part outside the interior (3). The described technical solution is characterized in that a guide element (7) is provided in the interior (3) of the hollow needle (2) and is displaceable in the longitudinal direction of the hollow needle (2), on which guide element (7) the cutting wire (6) is fastened at least at one location, and in that a movement means (8) is provided for moving the cutting wire (6), by which means a length of a part of the cutting wire (6) located outside the interior (3) can be modified in a targeted manner depending on the actuation of an adjustment element (11) acting on the movement means (8).