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EP-4260900-B1 - SLICED ELECTRODE AND IDENTIFICATION METHOD THEREFOR

EP4260900B1EP 4260900 B1EP4260900 B1EP 4260900B1EP-4260900-B1

Inventors

  • YI, Che
  • ZHU, YONGWEI
  • ZHANG, HAITAO

Dates

Publication Date
20260506
Application Date
20201214

Claims (8)

  1. A directional lead, comprising: a connection portion (1), and a plurality of electrode slices (2) circumferentially surrounding the connection portion (1) and arranged in an array, wherein a marking pattern (3) is disposed on a side surface of the connection portion (1), is located on a side of the plurality of electrode slices (2), and at least comprises three distinguishing feature portions, the three distinguishing feature portions are sharp corners or rounded corners; wherein the directional lead is characterized in that , positions of the plurality of electrode slices (2) are capable of being positioned by the distinguishing feature portions of the marking pattern (3) in a two-dimensional transmission scan image photographed in any direction of the directional lead; wherein the marking pattern (3) comprises a triangular pattern, the triangular pattern is an asymmetric graphic with respect to a first line, and the first line is a line that is parallel to a central axis of the connection portion (1) and located on the side surface of the connection portion (1).
  2. The directional lead of claim 1, wherein the marking pattern (3) is composed of a plurality of triangular patterns, and the marking pattern (3) is an asymmetric image with respect to the first line.
  3. The directional lead of claim 1, wherein the triangular pattern is an isosceles triangular pattern.
  4. The directional lead of claim 3, wherein a bottom edge of the isosceles triangular pattern is parallel to the central axis of the connection portion (1).
  5. The directional lead of claim 1, wherein two ends of the marking pattern (3) and a center point of a radial cross-section of the connection portion (1) form an angle of 105° to 135° on the radial cross-section of the connection portion (1).
  6. An identification method for a directional lead, comprising providing a marking pattern (3) in a non-electrode slice region of the directional lead, wherein when acquiring different two-dimensional transmission scan images of the directional lead, imaging positions or shapes of the marking pattern (3) in the different two-dimensional transmission scan images are different; and wherein the directional lead comprises: a connection portion (1), and a plurality of electrode slices (2) circumferentially surrounding the connection portion (1) and arranged in an array, wherein the marking pattern (3) is disposed on a side surface of the connection portion (1), is located on a side of the plurality of electrode slices (2), and at least comprises three distinguishing feature portions, the three distinguishing feature portions are sharp corners or rounded corners; acquiring, by a transmission optical imaging device, a two-dimensional transmission scan image photographed in any direction of the directional lead; and positioning, through an imaging of the marking pattern (3) on the two-dimensional transmission scan image, positions of the plurality of electrode slices (2); wherein the marking pattern (3) comprises a triangular pattern, the triangular pattern is an asymmetric graphic with respect to a first line, and the first line is a line that is parallel to a central axis of the directional lead and located on a side surface of the directional lead.
  7. The identification method for the directional lead of claim6, wherein the transmission optical imaging device performs an X-ray scan or an electronic computer tomography scan.
  8. The identification method for the directional lead of claim 6, wherein the directional lead comprises a connection portion (1), and a plurality of electrode slices (2) circumferentially surrounding the connection portion and arranged in an array.

Description

TECHNICAL FIELD The present invention relates to the field of medical technologies, and in particular, to a directional lead and an identification method therefor. BACKGROUND Every year, thousands of patients undergo the deep brain stimulation (DBS) surgery for treating Parkinson, obsessive-compulsive disorder, autism or the like, and matched medical appliances such as corresponding stimulators and electrode leads are implanted into the bodies of the patients. Traditional electrode leads employ annular stimulation contacts, and the annular stimulation contacts spread the electrical stimulation all around to achieve the treatment effect. However, the excessive treatment may cause some undesirable effects on brain sites not associated with treatment. In recent years, with the development of medical research, people begin to recognize that the stimulation point direction and the stimulation pulse after the electrode is implanted into the brain have significant influence on the treatment effect, and the requirement of providing different directions and different electrical stimulation pulses in a same ring-shaped circumferential direction arises. In order to improve the treatment precision, researchers divide an annular electrode into pieces, namely, multiple segments and multiple columns of electrode slices are arranged on one cylindrical annular surface, so that the generated electric stimulation can be directed at specific sites, thereby reducing the excessive treatment. However, for this directional lead, in the current actual use process, the medical staff cannot quickly and accurately position a certain one or several electrode slices so as to achieve the fixed-point electrical stimulation. Therefore, there is an urgent need for doctors to develop a mark identification method with low cost and high efficiency. Further relevant technologies are also known from US2020230397A1 which relates to imaging markers for stimulator leads, US8560085B2 which relates to methods for making leads with segmented electrodes for electrical stimulation systems and US 10067659B2 which relates to systems and methods for determining orientation of an implanted lead. SUMMARY The invention is set out in the appended set of claims. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a schematic structural diagram of a directional lead with a marking pattern according to the present invention;FIG. 2 shows an imaging of a directional lead without the marking pattern;FIG. 3 is a schematic structural diagram of different marking patterns, where FIG. 3(a) is an isosceles triangular pattern, FIG. 3(c) is a trapezoid pattern, FIG. 3(d) is a zigzag pattern, and FIG. 3(b) is a non-isosceles triangular pattern; andFIG. 4 shows imagings of a directional lead in different poses when a marking pattern is an isosceles triangular pattern. Reference numeral list 1connection portion2electrode slice3marking pattern DETAILED DESCRIPTION The present invention is further described below in conjunction with the drawings and the specific embodiments so that the present invention can be better understood by those skilled in the art and can be implemented, but the listed embodiments are not to be construed as limiting the present invention. As shown in FIG. 1, the present invention discloses a directional lead. The directional lead includes a connection portion 1, and multiple electrode slices 2 which circumferentially surround the connection portion and are arranged in an array. The connection portion has a columnar structure, and a marking pattern 3 is disposed on a side surface of the connection portion 1. The marking pattern 3 is located on a side of the electrode slices 2 and at least includes three distinguishing feature portions. The distinguishing feature portions are sharp corners or rounded corners, and positions of the electrode slices can be positioned by the distinguishing feature portions of the marking pattern 3. The working principle of the present invention is that, since the marking pattern 3 has three distinguishing feature portions, a transmission image of the directional lead is acquired when the directional lead is rotated, and the three distinguishing feature portions can form different combinations of shapes in different transmission images, so that the position of a certain electrode or several electrodes on the directional lead at this time can be distinguished. In the present invention, the electrode slice 2 is disposed on an outer periphery of the connection portion, a conductive wire is located inside the connection portion, or is molded on a same surface with the electrode slice by using the same process molding, or is located on a back surface of the electrode slice, so that the conductive wire is connected to the electrode slice 2 on the side surface of the connection portion 1 for supplying the power. As shown in FIG. 2, in the medical imaging of an existing directional lead, due to the significant difference in material between the e