JP6855560B1 - Transcranial electrical stimulation electrodes - Google Patents

Transcranial electrical stimulation electrodes Download PDF

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JP6855560B1
JP6855560B1 JP2019233624A JP2019233624A JP6855560B1 JP 6855560 B1 JP6855560 B1 JP 6855560B1 JP 2019233624 A JP2019233624 A JP 2019233624A JP 2019233624 A JP2019233624 A JP 2019233624A JP 6855560 B1 JP6855560 B1 JP 6855560B1
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亮介 冨尾
亮介 冨尾
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Abstract

【課題】本発明は電流量を低減し、脳表を効率よく刺激して精度の高い運動誘発電位検査を行うことができる経頭蓋電気刺激用電極を提供する。【解決手段】先端鋭利な導電性の芯部4の外周面に螺旋状の切刃5が形成されて頭蓋骨S1にねじ込む切込ねじ式の電極部1と、電極部1の基端部を被覆して頭皮S2と電極部1とを電気的に絶縁する絶縁部2と、絶縁部2を介して電極部1に給電するリード線を接続する接続部3とを備える。【選択図】図1PROBLEM TO BE SOLVED: To provide a transcranial electrical stimulation electrode capable of reducing the amount of electric current, efficiently stimulating the brain surface, and performing a highly accurate exercise-induced potential test. SOLUTION: A spiral cutting edge 5 is formed on an outer peripheral surface of a conductive core portion 4 having a sharp tip, and covers a cut screw type electrode portion 1 screwed into a skull S1 and a base end portion of the electrode portion 1. It is provided with an insulating portion 2 that electrically insulates the skull S2 and the electrode portion 1, and a connecting portion 3 that connects a lead wire that supplies power to the electrode portion 1 via the insulating portion 2. [Selection diagram] Fig. 1

Description

本発明は、頭蓋骨を介して脳に電気的な刺激を与える際に頭皮に刺入する経頭蓋電気刺激用電極に関する。 The present invention relates to transcranial electrical stimulation electrodes that are inserted into the scalp when electrical stimulation is applied to the brain via the skull.

脳神経外科や整形外科において脳や脊髄近傍の病変に対する手術操作を行う際には、術中の運動神経機能を評価するために運動誘発電位(MEP:Motor Evoked Potential)検査が行われている(例えば、特許文献1参照)。 When performing surgical operations on lesions near the brain and spinal cord in neurosurgery and orthopedics, motor evoked potential (MEP) tests are performed to evaluate intraoperative motor nerve function (for example,). See Patent Document 1).

術中の運動誘発電位検査では、経頭蓋電気刺激運動誘発電位測定用の定電流刺激装置等の給電手段にリード線を介して接続された電極が用いられ、当該電極から頭皮に印加される電流により脳表の運動野を刺激して、その運動野から錐体路を伝って末梢の筋肉群に発生する筋収縮からの電気信号(筋電図)を得ることで運動機能を評価している。 In the intraoperative exercise-induced potential test, an electrode connected via a lead wire to a feeding means such as a constant current stimulator for transcranial electrical stimulation exercise-induced potential measurement is used, and the current applied from the electrode to the scalp is used. Motor function is evaluated by stimulating the motor field on the brain surface and obtaining an electrical signal (electromyogram) from the muscle contraction generated in the peripheral muscle group along the pyramidal tract from the motor field.

近年、この種の電極として、リード線に接続された螺旋状の電極針と、該電極針の基端側を把持可能に覆う電極ホルダとを備える所謂コークスクリュー型電極が知られている。螺旋状の電極針を備える電極を用いることにより、電極ホルダを把持して回転させるだけで電極針の頭皮への刺入や抜去が容易に行える。また、電極針が螺旋状であるため頭皮に刺入されたときには外れ難く、電極の固定状態を確実に維持することができる。 In recent years, as this type of electrode, a so-called corkscrew type electrode including a spiral electrode needle connected to a lead wire and an electrode holder that grips the base end side of the electrode needle so as to be gripped is known. By using an electrode provided with a spiral electrode needle, the electrode needle can be easily inserted into or removed from the scalp simply by grasping and rotating the electrode holder. Further, since the electrode needle has a spiral shape, it does not easily come off when it is inserted into the scalp, and the fixed state of the electrode can be reliably maintained.

特開2014−150930号公報Japanese Unexamined Patent Publication No. 2014-150930

しかし、この種の電極においては、頭皮内脳波用の電極を流用する場合もあり、頭皮内脳波用の電極は螺旋状の電極針を備えるものの、穿刺量(穿刺したときの深さ)は頭の表皮から真皮に到達する程度であるから比較的浅い。 However, in this type of electrode, an electrode for intrascalp electroencephalogram may be diverted, and although the electrode for intrascalp electroencephalogram is equipped with a spiral electrode needle, the amount of puncture (depth at the time of puncture) is the head. It is relatively shallow because it reaches the dermis from the scalp.

このため、脳表を刺激するために電極から印加する刺激用の電流量については軽減の余地があり、現状では患者の頭部へ不必要に大きな電流量が流れている。電流量が多くなると、電極針からの電流漏れの量も大きくなるため、漏れ電流の影響で頸部筋群が刺激され術中に患者頭部が動き、固定された頭部および頸部に負担がかかるだけでなく、精密な手術操作を妨げることがある。また、顔面の筋群などの機能を評価する際には当該筋群が漏れ電流によって刺激されてしまい、運動誘発電位検査自体が正確に行えないおそれがある。 Therefore, there is room for reduction in the amount of stimulation current applied from the electrodes to stimulate the brain surface, and at present, an unnecessarily large amount of current is flowing to the patient's head. As the amount of current increases, the amount of current leakage from the electrode needle also increases, so the cervical muscle group is stimulated by the effect of the leakage current, the patient's head moves during the operation, and the fixed head and neck are burdened. Not only this, it may interfere with precise surgical operations. Further, when evaluating the function of the facial muscle group or the like, the muscle group may be stimulated by the leakage current, and the exercise-induced potential test itself may not be performed accurately.

上記の点に鑑み、本発明は電流量を低減し、脳表を効率よく刺激して精度の高い運動誘発電位検査を行うことができる経頭蓋電気刺激用電極を提供することを目的とする。 In view of the above points, it is an object of the present invention to provide a transcranial electrical stimulation electrode capable of reducing the amount of electric current, efficiently stimulating the brain surface, and performing a highly accurate exercise-induced potential test.

かかる目的を達成するために、本発明の経頭蓋電気刺激用電極は、先端鋭利な導電性の芯部の外周面に螺旋状の切刃が形成されて頭蓋骨にねじ込む切込ねじ式の電極部と、該電極部の基端部を被覆して頭皮と該電極部とを電気的に絶縁する絶縁部と、該絶縁部を介して前記電極部に給電するリード線を接続する接続部とを備え、前記絶縁部は、前記切刃が形成された部分よりも大径に形成されていて頭皮に挿入状態で先端側が頭蓋骨に当接する挿入部を備えることを特徴とする。 In order to achieve such an object, the transcranial electrical stimulation electrode of the present invention is a notch screw type electrode portion in which a spiral cutting edge is formed on the outer peripheral surface of a conductive core portion having a sharp tip and screwed into the skull. An insulating portion that covers the base end portion of the electrode portion and electrically insulates the skull from the electrode portion, and a connecting portion that connects a lead wire that supplies power to the electrode portion via the insulating portion. Bei example, the insulating portion, the distal end side in the inserted state than the portion where the cutting edge is formed has a larger diameter in the scalp, characterized in that it comprises an insertion portion which abuts against the skull.

本発明においては、切込ねじ式の電極部を頭蓋骨にねじ込むことにより、脳の表面に十分な強い電場を生成することができる。このとき、頭皮との接触部分は絶縁部によって電気的に絶縁されているので、電極部に印加した電流の頭皮への漏れが抑制され、電場を脳表に確実に集中させることができる。 In the present invention, a sufficiently strong electric field can be generated on the surface of the brain by screwing the notch screw type electrode portion into the skull. At this time, since the contact portion with the scalp is electrically insulated by the insulating portion, the leakage of the current applied to the electrode portion to the scalp is suppressed, and the electric field can be reliably concentrated on the brain surface.

これにより、効率的に脳表を刺激することで術中の患者の不用意な動きを防止することができる。しかも、電極部を頭蓋骨にねじ込むことで、電極部を脳表の近傍に位置させることができ、電流量を低減させて脳表を効率よく刺激することができる。 As a result, it is possible to prevent inadvertent movement of the patient during the operation by efficiently stimulating the brain surface. Moreover, by screwing the electrode portion into the skull, the electrode portion can be positioned near the brain surface, the amount of electric current can be reduced, and the brain surface can be stimulated efficiently.

また、本発明において、前記絶縁部は、前記挿入部よりも大径に形成されて頭皮の外表面に当接する鍔部を備えることを特徴とする。 Further, in the present invention, the insulating portion is characterized by including a collar portion formed having a diameter larger than that of the insertion portion and in contact with the outer surface of the scalp.

絶縁部に鍔部を設けることにより、頭蓋骨に電極部をねじ込むときに、鍔部が頭皮の表面に当接して絶縁部が頭皮に埋没することを防止することができ、絶縁部による絶縁状態を確実に維持することができる。 By providing the flange portion in the insulating portion, it is possible to prevent the flange portion from contacting the surface of the scalp and burying the insulating portion in the scalp when the electrode portion is screwed into the skull. It can be reliably maintained.

また、本発明において、前記接続部は、前記電極部を頭蓋骨にねじ込む際に回転工具が接続可能となる形状に形成されていることを特徴とする。これによれば、回転工具を使用した電極部のねじ込み作業を円滑に行うことができる。 Further, in the present invention, the connecting portion is formed in a shape that allows a rotary tool to be connected when the electrode portion is screwed into the skull. According to this, the screwing work of the electrode portion using the rotary tool can be smoothly performed.

本発明の第1の実施形態の経頭蓋電気刺激用電極の側面図。The side view of the electrode for transcranial electrical stimulation of the 1st Embodiment of this invention. 第1の実施形態の経頭蓋電気刺激用電極の平面図。The plan view of the electrode for transcranial electrical stimulation of the first embodiment. 第1の実施形態の経頭蓋電気刺激用電極の使用状態を示す説明的断面図。Explanatory sectional view which shows the use state of the electrode for transcranial electrical stimulation of 1st Embodiment. 本発明の第2の実施形態の経頭蓋電気刺激用電極の側面図。The side view of the electrode for transcranial electrical stimulation of the 2nd Embodiment of this invention. 第2の実施形態の経頭蓋電気刺激用電極の平面図。The plan view of the electrode for transcranial electrical stimulation of the second embodiment. 第2の実施形態の経頭蓋電気刺激用電極の使用状態を示す説明的断面図。Explanatory sectional view which shows the use state of the electrode for transcranial electrical stimulation of the 2nd Embodiment.

本発明の第1の実施形態について図1〜図3を用いて説明する。第1の実施形態の経頭蓋電気刺激用電極は、図1に示すように、ステンレス等の金属材料により形成された電極部1と、電気的絶縁性を有する合成樹脂を材料として形成された絶縁部2とを備えている。 The first embodiment of the present invention will be described with reference to FIGS. 1 to 3. As shown in FIG. 1, the transcranial electrical stimulation electrode of the first embodiment has an electrode portion 1 formed of a metal material such as stainless steel and an insulation formed of a synthetic resin having electrical insulating properties. It has a part 2.

絶縁部2の基端側(電極部1の反対側)からは、図示しないリード線を接続する接続部3が突出して設けられている。接続部3は、図2に示すように、六角形の柱状に形成されており、例えば、図示しない鰐口クリップ等を介してリード線を接続する。また、リード線を接続していないときには、図示しないが、ボックスレンチやスパナ等の回転工具を接続することができる。 A connecting portion 3 for connecting a lead wire (not shown) is provided so as to project from the base end side (opposite side of the electrode portion 1) of the insulating portion 2. As shown in FIG. 2, the connecting portion 3 is formed in a hexagonal columnar shape, and for example, a lead wire is connected via a crocodile clip (not shown). When the lead wire is not connected, a rotating tool such as a box wrench or a spanner can be connected, although not shown.

電極部1は、図1に示すように、先端鋭利な芯部4を備えている。芯部4の外周面には、螺旋状の切刃5が形成されている。これにより、電極部1は、タッピングねじ等の所謂切込ねじと同様の構成を備える。 As shown in FIG. 1, the electrode portion 1 includes a core portion 4 having a sharp tip. A spiral cutting edge 5 is formed on the outer peripheral surface of the core portion 4. As a result, the electrode portion 1 has a configuration similar to that of a so-called notch screw such as a tapping screw.

そして、図3に示すように、電極部1は、接続部3と一体に形成されている。これにより、接続部3を介して電極部1に回転力を付与することで、電極部1は、頭蓋骨S1にねじ込まれる。 Then, as shown in FIG. 3, the electrode portion 1 is integrally formed with the connecting portion 3. As a result, the electrode portion 1 is screwed into the skull S1 by applying a rotational force to the electrode portion 1 via the connecting portion 3.

電極部1は、頭蓋骨S1に螺着させたときに、頭蓋骨S1の厚み内に留まって螺着状態が十分深く且つ頭蓋骨S1を貫通することのない長さ寸法に設定される。電極部1の先端から絶縁部2までの長さ寸法は、具体的には、2〜5mmの範囲の何れかが選択的に設定されることが好ましい。 When the electrode portion 1 is screwed onto the skull S1, the electrode portion 1 is set to a length dimension that stays within the thickness of the skull S1 so that the screwed state is sufficiently deep and does not penetrate the skull S1. Specifically, it is preferable that the length dimension from the tip of the electrode portion 1 to the insulating portion 2 is selectively set in any range of 2 to 5 mm.

図1に示すように、絶縁部2は、電極部1の基端部を被覆して電極部1の軸線方向に延びる挿入部6を備えている。挿入部6は、図3に示すように、電極部1が頭蓋骨S1に螺着されているとき、頭皮S2の中に挿入状態となる。これにより、電極部1と頭皮S2とが非接触となる。 As shown in FIG. 1, the insulating portion 2 includes an insertion portion 6 that covers the base end portion of the electrode portion 1 and extends in the axial direction of the electrode portion 1. As shown in FIG. 3, the insertion portion 6 is inserted into the scalp S2 when the electrode portion 1 is screwed to the skull S1. As a result, the electrode portion 1 and the scalp S2 are not in contact with each other.

絶縁部2は、更に、図1に示すように、挿入部6よりも大径に形成されて外側に円盤状に張り出す鍔部7を備えている。鍔部7は、図3に示すように、頭皮S2の外表面に当接する。これにより、電極部1を頭蓋骨S1に螺着したときに、絶縁部2の挿入部6が頭皮S2に埋没することを防止することができる。 As shown in FIG. 1, the insulating portion 2 further includes a flange portion 7 formed having a diameter larger than that of the insertion portion 6 and projecting outward in a disk shape. As shown in FIG. 3, the collar portion 7 abuts on the outer surface of the scalp S2. This makes it possible to prevent the insertion portion 6 of the insulating portion 2 from being buried in the scalp S2 when the electrode portion 1 is screwed onto the skull S1.

以上の構成により、図3に示すように、電極部1を頭蓋骨S1に螺着し、接続部3にリード線を接続して電流を印加することにより、脳表に極めて強い電場を生成できる。 With the above configuration, as shown in FIG. 3, an extremely strong electric field can be generated on the brain surface by screwing the electrode portion 1 to the skull S1 and connecting a lead wire to the connecting portion 3 to apply an electric current.

しかも、絶縁部2が電極部1からの電流漏れを阻止することにより電流量が低減でき、術中の患者の不用意な動きを防止して、脳表を効率よく刺激することができる。 Moreover, the amount of current can be reduced by preventing the current leakage from the electrode portion 1 by the insulating portion 2, the careless movement of the patient during the operation can be prevented, and the brain surface can be efficiently stimulated.

次に、本発明の第2の実施形態について図4〜図6を用いて説明する。第2の実施形態の経頭蓋電気刺激用電極は、図4に示すように、ステンレス等の金属材料により形成された電極部11と、電気的絶縁性を有する合成樹脂を材料として形成された絶縁部12とを備えている。絶縁部12の近傍には、図示しないリード線を接続する接続部13が設けられている。 Next, the second embodiment of the present invention will be described with reference to FIGS. 4 to 6. As shown in FIG. 4, the transcranial electrical stimulation electrode of the second embodiment has an electrode portion 11 formed of a metal material such as stainless steel and an insulation formed of a synthetic resin having electrical insulating properties. It is provided with a unit 12. A connecting portion 13 for connecting a lead wire (not shown) is provided in the vicinity of the insulating portion 12.

また、図5及び図6に示すように、絶縁部12の基端側(電極部11の反対側)には、六角形状の工具用接続穴18が形成されている。接続穴18には、図示しないが、六角レンチ等の回転工具が接続できるようになっている。 Further, as shown in FIGS. 5 and 6, a hexagonal tool connection hole 18 is formed on the base end side (opposite side of the electrode portion 11) of the insulating portion 12. Although not shown, a rotary tool such as a hexagon wrench can be connected to the connection hole 18.

また、図示しないが、リード線の接続端部に六角柱状のプラグ端子を備えた場合、このプラグ端子を接続穴18に挿着することで安定固定と給電も可能となる。この場合、接続穴18は、接続部13と同様の機能を有するものとなり、本発明における接続部に相当する。 Further, although not shown, when a hexagonal columnar plug terminal is provided at the connection end of the lead wire, stable fixing and power supply can be performed by inserting the plug terminal into the connection hole 18. In this case, the connection hole 18 has the same function as the connection portion 13, and corresponds to the connection portion in the present invention.

電極部11は、図4に示すように、先端鋭利な芯部14を備えている。芯部14の外周面には、螺旋状の切刃15が形成されている。これにより、電極部11は、タッピングねじ等の所謂切込ねじと同様の構成を備える。 As shown in FIG. 4, the electrode portion 11 includes a core portion 14 having a sharp tip. A spiral cutting edge 15 is formed on the outer peripheral surface of the core portion 14. As a result, the electrode portion 11 has a configuration similar to that of a so-called notch screw such as a tapping screw.

そして、図6に示すように、電極部11は、その基端部が接続穴18の内部面を構成するように形成されている。接続穴18に付与された回転力は、電極部11を回転させる。電極部11は、回転することにより頭蓋骨S1にねじ込まれる。 Then, as shown in FIG. 6, the electrode portion 11 is formed so that the base end portion thereof constitutes the inner surface of the connection hole 18. The rotational force applied to the connection hole 18 rotates the electrode portion 11. The electrode portion 11 is screwed into the skull S1 by rotating.

電極部11は、頭蓋骨S1に螺着させたときに、頭蓋骨S1の厚み内に留まって螺着状態が十分深く且つ頭蓋骨S1を貫通することのない長さ寸法に設定される。電極部11の先端から絶縁部12までの長さ寸法は、具体的には、2〜5mmの範囲の何れかが選択的に設定されることが好ましい。 When the electrode portion 11 is screwed onto the skull S1, the electrode portion 11 is set to a length dimension that stays within the thickness of the skull S1 so that the screwed state is sufficiently deep and does not penetrate the skull S1. Specifically, it is preferable that the length dimension from the tip of the electrode portion 11 to the insulating portion 12 is selectively set in any range of 2 to 5 mm.

絶縁部12は、図4に示すように、電極部11の基端部を被覆して電極部11の軸線方向に延びる挿入部16を備えている。挿入部16は、図6に示すように、電極部11が頭蓋骨S1に螺着されているとき、頭皮S2の中に挿入状態となる。これにより、電極部11と頭皮S2とが非接触となる。 As shown in FIG. 4, the insulating portion 12 includes an insertion portion 16 that covers the base end portion of the electrode portion 11 and extends in the axial direction of the electrode portion 11. As shown in FIG. 6, the insertion portion 16 is inserted into the scalp S2 when the electrode portion 11 is screwed to the skull S1. As a result, the electrode portion 11 and the scalp S2 are not in contact with each other.

更に、絶縁部12は、図4に示すように、挿入部16よりも大径に形成されて外側に張り出す鍔部17を備えている。鍔部17は、図6に示すように、頭皮S2の外表面に当接する。これにより、電極部11を頭蓋骨S1に螺着したとき、絶縁部12の挿入部16が頭皮S2に埋没してしまうことを防止することができる。 Further, as shown in FIG. 4, the insulating portion 12 includes a flange portion 17 formed having a diameter larger than that of the insertion portion 16 and projecting outward. As shown in FIG. 6, the collar portion 17 comes into contact with the outer surface of the scalp S2. This makes it possible to prevent the insertion portion 16 of the insulating portion 12 from being buried in the scalp S2 when the electrode portion 11 is screwed onto the skull S1.

また、鍔部17には、図4及び図6に示すように、溝部19が形成されており、前記接続部13は、この溝部19内部に設けられている。接続部13には、リード線の接続端部が接続されるが、リード線の接続端部には、前記溝部19の形状に対応して開閉することにより接続部13を把持する把持部材を設けておくことが好ましい。 Further, as shown in FIGS. 4 and 6, the flange portion 17 is formed with a groove portion 19, and the connection portion 13 is provided inside the groove portion 19. The connection end of the lead wire is connected to the connection portion 13, and the connection end of the lead wire is provided with a gripping member that grips the connection portion 13 by opening and closing according to the shape of the groove portion 19. It is preferable to keep it.

以上の構成により、図6に示すように、電極部11を頭蓋骨S1に螺着し、接続部13にリード線を接続して電流を印加することにより、脳表に極めて強い電場を生成できる。 With the above configuration, as shown in FIG. 6, an extremely strong electric field can be generated on the brain surface by screwing the electrode portion 11 to the skull S1 and connecting a lead wire to the connecting portion 13 to apply an electric current.

しかも、絶縁部12が電極部11からの電流漏れを阻止することにより電流量が低減でき、術中の患者の不用意な動きを防止して、脳表を効率よく刺激することができる。 Moreover, the amount of current can be reduced by preventing the current leakage from the electrode portion 11 by the insulating portion 12, and the careless movement of the patient during the operation can be prevented and the brain surface can be efficiently stimulated.

S1…頭蓋骨、S2…頭皮、1,11…電極部、2,12…絶縁部、3,13…接続部、4,14…芯部、5,15…切刃、6,16…挿入部、7,17…鍔部。
S1 ... Skull, S2 ... Scalp, 1,11 ... Electrode part, 2,12 ... Insulation part, 3,13 ... Connection part, 4,14 ... Core part, 5,15 ... Cutting edge, 6,16 ... Insert part, 7, 17 ... The scalp.

Claims (3)

先端鋭利な導電性の芯部の外周面に螺旋状の切刃が形成されて頭蓋骨にねじ込む切込ねじ式の電極部と、
該電極部の基端部を被覆して頭皮と該電極部とを電気的に絶縁する絶縁部と、
該絶縁部を介して前記電極部に給電するリード線を接続する接続部とを備え、
前記絶縁部は、前記切刃が形成された部分よりも大径に形成されていて頭皮に挿入状態で先端側が頭蓋骨に当接する挿入部を備えることを特徴とする経頭蓋電気刺激用電極。
A notch-screw type electrode that has a spiral cutting edge formed on the outer peripheral surface of a conductive core with a sharp tip and is screwed into the skull.
An insulating portion that covers the base end portion of the electrode portion and electrically insulates the scalp and the electrode portion.
Bei example a connecting portion for connecting a lead wire supplying power to the electrode portion through the insulating portion,
The insulating portion is an electrode for transcranial electrical stimulation, which is formed to have a diameter larger than the portion on which the cutting edge is formed and includes an insertion portion whose tip end side abuts on the skull when inserted into the scalp.
前記絶縁部は、前記挿入部よりも大径に形成されて頭皮の外表面に当接する鍔部を備えることを特徴とする請求項1記載の経頭蓋電気刺激用電極。 The transcranial electrical stimulation electrode according to claim 1, wherein the insulating portion includes a collar portion formed having a diameter larger than that of the insertion portion and abutting on the outer surface of the scalp. 前記接続部は、前記電極部を頭蓋骨にねじ込む際に回転工具が接続可能となる形状に形成されていることを特徴とする請求項1又は2記載の経頭蓋電気刺激用電極。 The transcranial electrical stimulation electrode according to claim 1 or 2, wherein the connecting portion is formed in a shape that allows a rotating tool to be connected when the electrode portion is screwed into the skull.
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WO2024115937A1 (en) * 2022-12-02 2024-06-06 Sorin Crm Sas Cutting helix for lead fixation

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EP2515750A4 (en) * 2009-12-21 2013-07-10 Sherwin Hua Insertion of medical devices through non-orthogonal and orthogonal trajectories within the cranium and methods of using
JP2018175161A (en) * 2017-04-07 2018-11-15 学校法人慶應義塾 Electrode for transcranial electric stimulation

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* Cited by examiner, † Cited by third party
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WO2024115937A1 (en) * 2022-12-02 2024-06-06 Sorin Crm Sas Cutting helix for lead fixation

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