CN112370660A - Implantable medical device - Google Patents

Implantable medical device Download PDF

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Publication number
CN112370660A
CN112370660A CN202011257905.9A CN202011257905A CN112370660A CN 112370660 A CN112370660 A CN 112370660A CN 202011257905 A CN202011257905 A CN 202011257905A CN 112370660 A CN112370660 A CN 112370660A
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negative electrode
graphene
positive electrode
main body
titanium oxide
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陈磊
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Bengbu Keruida Machinery Design Co ltd
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Bengbu Keruida Machinery Design Co ltd
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N1/00—Electrotherapy; Circuits therefor
    • A61N1/18—Applying electric currents by contact electrodes
    • A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
    • A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
    • A61N1/3604—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation for correcting spinal deformities, e.g. scoliosis
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N1/00—Electrotherapy; Circuits therefor
    • A61N1/02—Details
    • A61N1/04—Electrodes
    • A61N1/05—Electrodes for implantation or insertion into the body, e.g. heart electrode
    • A61N1/0551—Spinal or peripheral nerve electrodes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N1/00—Electrotherapy; Circuits therefor
    • A61N1/18—Applying electric currents by contact electrodes
    • A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
    • A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
    • A61N1/372—Arrangements in connection with the implantation of stimulators
    • A61N1/378—Electrical supply
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
    • H01M4/485—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/624—Electric conductive fillers
    • H01M4/625—Carbon or graphite
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M6/00—Primary cells; Manufacture thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
    • H01M2004/027—Negative electrodes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Electrochemistry (AREA)
  • Veterinary Medicine (AREA)
  • Public Health (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Biomedical Technology (AREA)
  • General Health & Medical Sciences (AREA)
  • Radiology & Medical Imaging (AREA)
  • General Chemical & Material Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Neurology (AREA)
  • Inorganic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Neurosurgery (AREA)
  • Cardiology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Electrotherapy Devices (AREA)

Abstract

The invention provides an implantable medical device, the shape of an implanted main body can be adjusted according to the lateral bending degree of a vertebral column, so that the implantable medical device can adapt to patients with different degrees, a mounting arm can rotate, the position of an electrode can also be adjusted, and the implantable medical device can be implanted into the vertebral canal after being adjusted according to a stimulation position, so that the treatment effect is enhanced, the specific energy of a battery electrode is increased to a great extent due to the selection of a lithium titanium oxide-graphene-lithium titanium oxide composite material of a battery electrode material, and meanwhile, the implantable medical device has stable electric conduction and electric output performance, can keep higher capacity maintenance rate under the condition of high-power operation, and greatly improves the service life, stability and safety of the whole device.

Description

Implantable medical device
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of medical equipment, in particular to implantable medical equipment.
[ background of the invention ]
Scoliosis is a common disease which endangers teenagers and children, and if the scoliosis is not discovered and treated timely in time, very serious deformity can be developed, the heart and lung functions can be influenced, and even paralysis can be caused by serious people.
[ summary of the invention ]
In view of the above, embodiments of the present invention provide an implantable medical device.
An implantable medical device comprising an active assembly implanted within a spinal canal, the active assembly comprising at least:
the implantation main body is fixedly arranged in the vertebral canal, the external contour of the implantation main body is adjusted to a state which is adaptive to the lateral bending degree of the vertebra, the implantation main body comprises two sub main bodies which can move relatively, and the bottom of the first sub main body is connected with the top of the second sub main body through a connecting piece; one end part of the connecting piece is fixed at the top of the second sub-main body, a track groove is formed in the surface of the connecting piece, a circular sliding block with a screw rod is arranged at the bottom of the first sub-main body, the circular sliding block is arranged in the track groove and can move along the track groove, and the screw rod extends into the first sub-main body and is driven by a nut; the implantation main body is fixed on the yellow ligament through a fixed hand grip arranged at the bottom of the second sub-main body;
the mounting arm comprises a first mounting arm and a second mounting arm, the first mounting arm is mounted on the outer wall of the first sub-body, and the second mounting arm is mounted on the outer wall of the second sub-body;
an electrode including a positive electrode and a negative electrode, the positive electrode being disposed at an end of the first mounting arm, the negative electrode being disposed at an end of the second mounting arm
And the positive electrode and the negative electrode of the battery are respectively connected with the positive electrode and the negative electrode, and the battery is simultaneously used for supplying power to the whole active component.
Preferably, the action assembly further comprises:
and the controller is electrically connected with the positive electrode and the negative electrode and is used for receiving a control signal of an external terminal to control the on-off and the intensity of the current between the positive electrode and the negative electrode.
Preferably, the apparatus further comprises: an external terminal, the external terminal comprising at least:
the receiving module is used for receiving the input of control information of an operator;
the processing module is used for processing the control information and generating a corresponding control signal;
and the sending module is used for sending the control signal to the controller of the action assembly.
Preferably, the battery comprises a positive electrode, a negative electrode and a diaphragm, wherein the diaphragm is positioned between the positive electrode and the negative electrode, the negative electrode comprises a negative electrode current collector, the surface of the negative electrode current collector is coated with a negative electrode material, the positive electrode comprises a positive electrode current collector, and the surface of the positive electrode current collector is coated with a positive electrode material; the negative electrode material is a lithium titanium oxide-graphene-lithium titanium oxide composite material which is a particle structure formed by gathering a plurality of hammer-shaped structures on a graphene connector, the hammer head part of each hammer-shaped structure is spherical lithium titanium oxide particles, graphene thin layers distributed on the surfaces of the lithium titanium oxide particles form a graphene conductive network, the hammer handle of each hammer-shaped structure is a graphene rod, the root part of each graphene rod is connected with the graphene connector, the maximum diameter of the cross section of each graphene rod is smaller than the particle size of the lithium titanium oxide particles, and the maximum diameter of the cross section of each graphene connector is smaller than the particle size of the lithium titanium oxide particles; the positive electrode material comprises lithium manganate, a conductive agent and a binder; the diaphragm is a polypropylene/polyethylene composite film; the electrolyte comprises an organic solvent and a lithium salt, wherein the mass ratio of each component of the organic solvent is that ethylene carbonate: propylene carbonate: ethyl methyl carbonate 1:1:1, lithium salt is lithium hexafluorophosphate with concentration of 1M.
Preferably, the particle size of the lithium titanium oxide particles is 100-500nm, the thickness of the graphene thin layer is 5-20nm, and the maximum cross-sectional dimension of the graphene connector is 50-300 nm.
One of the above technical solutions has the following beneficial effects:
the invention provides an implantable medical device, the shape of an implanted main body can be adjusted according to the lateral bending degree of a vertebral column, so that the implantable medical device can adapt to patients with different degrees, a mounting arm can rotate, the position of an electrode can also be adjusted, and the implantable medical device can be implanted into the vertebral canal after being adjusted according to a stimulation position, so that the treatment effect is enhanced, the specific energy of a battery electrode is increased to a great extent due to the selection of a lithium titanium oxide-graphene-lithium titanium oxide composite material of a battery electrode material, and meanwhile, the implantable medical device has stable electric conduction and electric output performance, can keep higher capacity maintenance rate under the condition of high-power operation, and greatly improves the service life, stability and safety of the whole device.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.
FIG. 1 is a schematic structural diagram of an implantable medical device according to an embodiment of the present invention;
fig. 2 is a schematic structural view of a lithium titanium oxide-graphene-lithium titanium oxide composite material according to an embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of an implantable medical device according to an embodiment of the present invention;
fig. 4 is a block diagram of an external terminal according to an embodiment of the present invention.
[ detailed description ] embodiments
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
FIG. 1 is a schematic structural diagram of an implantable medical device according to an embodiment of the present invention; fig. 2 is a schematic structural view of a lithium titanium oxide-graphene-lithium titanium oxide composite material according to an embodiment of the present invention; FIG. 3 is a schematic circuit diagram of an implantable medical device according to an embodiment of the present invention; fig. 4 is a block diagram of an external terminal according to an embodiment of the present invention.
As shown in fig. 1-4, embodiments of the present invention provide an implantable medical device including an active component 100 implanted within a spinal canal of a spine, the active component 100 including at least:
the implant body 1 is fixedly arranged in a vertebral canal, the external contour of the implant body 1 is adjusted to a state which is suitable for the lateral bending degree of the vertebra, the implant body 1 comprises two sub-bodies which can move relatively, wherein the bottom of the first sub-body 11 is connected with the top of the second sub-body 12 through a connecting piece 13; one end of the connecting piece 13 is fixed on the top of the second sub-body 12, the surface of the connecting piece 13 is provided with a track groove 131, the bottom of the first sub-body 11 is provided with a circular sliding block 111 with a screw 112, the circular sliding block 111 is arranged in the track groove 131 and can move along the track groove 131, and the screw 112 extends into the first sub-body 12 and is carried out through a nut 113; the implantation main body 1 is fixed on the yellow ligament through a fixing hand grip 14 arranged at the bottom of the second sub-main body 12;
a mounting arm 2, the mounting arm 2 including a first mounting arm 21 and a second mounting arm 22, the first mounting arm 21 being mounted on an outer wall of the first sub-body 11, the second mounting arm 22 being mounted on an outer wall of the second sub-body 12;
the electrode 3, the electrode 3 includes positive electrode 31 and negative electrode 32, the positive electrode 31 is distributed on the end of the first mounting arm 21, the negative electrode 32 is distributed on the end of the second mounting arm 22;
and a battery 4, wherein the positive electrode and the negative electrode of the battery are respectively connected with the positive electrode and the negative electrode, and the battery is simultaneously used for supplying power to the whole active component.
It should be noted that the first sub-body can move relative to the second sub-body through the connecting member, and the movement is divided into two types: one is linear motion, namely, the distance between the first sub-main body and the second sub-main body is adjusted, so that the shape of the implanted main body is changed, the implanted main body is suitable for patients with different degrees of scoliosis, and the electrodes can be ensured to stimulate the parts needing stimulation; the other is a rotational movement, i.e. adjusting the position of the electrode on the first sub-body. After the movement adjustment is completed, the adjusted positions are fixed through nuts. The action component needs to be implanted into a human body, so the whole external material can be selected from biomedical metal materials, biomedical polymer materials with plasticity, biomedical polymer materials or biological ceramics, biological composite materials and the like. If the bulk exterior material is a non-conductive material (e.g., a bioceramic), the electrode portion needs to be coated with a conductive material (e.g., a titanium alloy), and if the bulk exterior material is a conductive material (e.g., a titanium alloy), the electrode portion needs to be coated with an insulating biomaterial (e.g., silica gel) at other locations except the electrode portion.
The positive electrode and the negative electrode are both in a disk shape, and a plurality of conductive stimulation tips are distributed on the surface of the disk-shaped electrode.
The implantation main body is fixed on the yellow tough belt through a fixing hand grip arranged at the bottom of the second sub-main body and is fixed at a target position through a fixing nail; the battery and controller are integrated within the implant body, although it is also possible to integrate the battery and controller externally of the implant body if desired.
Further, the action assembly of the present embodiment further includes:
and the controller 5 is electrically connected with the positive electrode and the negative electrode and is used for receiving a control signal of an external terminal to control the on-off and the intensity of the current between the positive electrode and the negative electrode.
The controller is used for receiving and recognizing the control signal sent by the external terminal, and controlling the opening and closing of the action component, the electric stimulation intensity and the like based on the corresponding control signal.
It should be noted that the apparatus of this embodiment further includes: an external terminal 200 including at least:
a receiving module 201 for receiving an input of control information of an operator;
the processing module 202 processes the control information and generates a corresponding control signal;
and the sending module 203 sends the control signal to the controller of the action component.
Control information includes, but is not limited to: switching information, current intensity.
Specifically, the battery comprises a positive electrode, a negative electrode and a diaphragm, wherein the diaphragm is positioned between the positive electrode and the negative electrode, the negative electrode comprises a negative electrode current collector, the surface of the negative electrode current collector is coated with a negative electrode material, the positive electrode comprises a positive electrode current collector, and the surface of the positive electrode current collector is coated with a positive electrode material; the negative electrode material is a lithium titanium oxide-graphene-lithium titanium oxide composite material, the composite material is a particle structure formed by gathering a plurality of hammer-shaped structures on a graphene connector, the hammer head part of each hammer-shaped structure is spherical lithium titanium oxide particles, a graphene thin layer distributed on the surface of each lithium titanium oxide particle forms a graphene conductive network 1000, the hammer handle of each hammer-shaped structure is a graphene rod 2000, the root of each graphene rod is connected with a graphene connector 3000 in a crossing mode, the maximum diameter of the cross section of each graphene rod is smaller than the particle size of each lithium titanium oxide particle, and the maximum diameter of the cross section of each graphene connector is smaller than the particle size of each lithium titanium oxide particle; the positive electrode material comprises lithium manganate, a conductive agent and a binder; the diaphragm is a polypropylene/polyethylene composite film; the electrolyte comprises an organic solvent and a lithium salt, wherein the mass ratio of each component of the organic solvent is that ethylene carbonate: propylene carbonate: ethyl methyl carbonate 1:1:1, lithium salt is lithium hexafluorophosphate with concentration of 1M.
The particle size of the lithium titanium oxide particles is 100-500nm, the thickness of the graphene thin layer is 5-20nm, and the maximum cross-sectional size of the graphene connector is 50-300 nm.
The thin film battery of this example was prepared by the following steps:
a. preparing lithium titanium oxide particles, the lithium titanium oxide having a spherical particle shape;
b. concentrated sulfuric acid (80% pure H by mass) is added into a reaction kettle2SO4Aqueous solution), then adding artificial flake graphite, wherein the total adding amount of the artificial flake graphite is 1/3 of concentrated sulfuric acid by mass; uniformly stirring at the temperature lower than 0 ℃, slowly dropping hydrogen peroxide at a constant speed, wherein the total adding amount of the hydrogen peroxide is 1/6 mass of concentrated sulfuric acid by mass, the adding time is 2 hours, and then continuously stirring for 2 hours; then heating in water bath, continuously stirring for 2h after the temperature is raised to 50 ℃, slowly dripping deionized water at a constant speed for dilution until the volume of the mixed solution is 2 times of that before dilution, and fully stirring; then adding potassium permanganate, wherein the total amount of potassium permanganate added is 1/9 mass of concentrated sulfuric acid by mass, fully and uniformly stirring, filtering and drying to obtain graphene oxide powder, and adding the graphene oxide powder into acetone to be uniformly dispersed by ultrasonic to obtain graphene oxide dispersion liquid;
c. adding the lithium titanium oxide particles obtained in the step a into the graphene oxide dispersion liquid obtained in the step b, fully and uniformly stirring to obtain mixed slurry, wherein the mass ratio of the lithium titanium oxide to the graphene oxide in the mixed slurry is 1:6, filtering, drying in a drying oven at the temperature of 70 ℃ to obtain a precursor of the lithium titanium oxide/graphene oxide composite material, adding a hydrofluoric acid aqueous solution with the mass concentration of 15% into the precursor, carrying out primary etching for 2 hours, cleaning an etching product, removing hydrofluoric acid on the surface of the product, filtering, and drying to obtain a composite material precursor product after the primary etching;
d. c, adding the precursor product obtained in the step c into ethanol for ultrasonic dispersion treatment, wherein the ultrasonic treatment time is 2 hours, the ultrasonic frequency is 100KHz, and filtering and drying to obtain a powdery precursor;
e. d, adding the powdery precursor obtained in the step d into N-methyl pyrrolidone which is 3 times of the mass of the precursor powder, and stirring to uniformly mix the precursor powder and the N-methyl pyrrolidone to obtain negative electrode slurry;
f. coating the negative electrode slurry obtained in the step e on an aluminum foil serving as a negative electrode current collector, drying for 4h at the temperature of 65 ℃, then carrying out heat treatment for 20h at the temperature of 180 ℃ under a vacuum condition, reducing graphite oxide into graphene with a porous cross-linked structure, coating the graphene on the surfaces of lithium titanium oxide particles, and forming the graphene into a particle structure formed by gathering a plurality of hammer-shaped structures on a graphene connector by adopting a template method, so as to obtain a negative electrode precursor coated with a negative electrode material on the surface of the negative electrode current collector;
g. soaking the negative electrode precursor obtained in the step f in a hydrofluoric acid aqueous solution with the mass concentration of 20%, performing secondary etching for 4 hours, taking out the negative electrode precursor, cleaning to remove the hydrofluoric acid on the surface of the negative electrode precursor, and drying for 8 hours at 65 ℃ under a vacuum condition to obtain a negative electrode with the surface of a negative electrode current collector coated with a negative electrode material layer, wherein the negative electrode material is the lithium titanium oxide-graphene-lithium titanium oxide composite material;
h. preparing a positive electrode by taking lithium manganate as a positive electrode active material;
i. and forming an electrode assembly by using a stacking structure of a negative electrode/a diaphragm/a positive electrode/a diaphragm/a negative electrode, putting the electrode assembly into a shell, injecting electrolyte and sealing to form a battery preformed body, and after a battery preformed body is subjected to a formation process, carrying out capacity grading and matching to obtain the thin-film secondary battery, wherein the stacking number of the electrodes of the stacking structure can be adjusted according to the output power of the battery.
The differences in capacity retention and safety between the battery of this example and the battery of the prior art are compared by table 1 below. The experimental group adopts the battery of the embodiment of the invention, the comparison group adopts graphite carbon powder as an active substance and PEO as an adhesive to prepare a negative electrode, and adopts lithium manganate as a positive electrode active material to prepare a positive electrode, and other steps are completely the same as the steps of the embodiment of the invention.
TABLE 1
Figure BDA0002773625060000101
The technical scheme of the embodiment of the invention has the following beneficial effects:
the invention provides an implantable medical device, the shape of an implanted main body can be adjusted according to the lateral bending degree of a vertebral column, so that the implantable medical device can adapt to patients with different degrees, a mounting arm can rotate, the position of an electrode can also be adjusted, and the implantable medical device can be implanted into the vertebral canal after being adjusted according to a stimulation position, so that the treatment effect is enhanced, the specific energy of a battery electrode is increased to a great extent due to the selection of a lithium titanium oxide-graphene-lithium titanium oxide composite material of a battery electrode material, and meanwhile, the implantable medical device has stable electric conduction and electric output performance, can keep higher capacity maintenance rate under the condition of high-power operation, and greatly improves the service life, stability and safety of the whole device.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (3)

1. An implantable medical device comprising an active component implanted in a spinal canal, the active component comprising at least:
the implantation main body is fixedly arranged in the vertebral canal, the external contour of the implantation main body is adjusted to a state which is adaptive to the lateral bending degree of the vertebra, the implantation main body comprises two sub main bodies which can move relatively, and the bottom of the first sub main body is connected with the top of the second sub main body through a connecting piece; one end part of the connecting piece is fixed at the top of the second sub-main body, a track groove is formed in the surface of the connecting piece, a circular sliding block with a screw rod is arranged at the bottom of the first sub-main body, the circular sliding block is arranged in the track groove and can move along the track groove, and the screw rod extends into the first sub-main body and is driven by a nut; the implantation main body is fixed on the yellow ligament through a fixed hand grip arranged at the bottom of the second sub-main body;
the mounting arm comprises a first mounting arm and a second mounting arm, the first mounting arm is mounted on the outer wall of the first sub-body, and the second mounting arm is mounted on the outer wall of the second sub-body;
the electrode comprises a positive electrode and a negative electrode, the positive electrode is distributed at the end part of the first mounting arm, and the negative electrode is distributed at the end part of the second mounting arm;
the positive electrode and the negative electrode of the battery are respectively connected with the positive electrode and the negative electrode, and the battery is simultaneously used for supplying power to the whole active component;
the device further comprises: an external terminal, the external terminal comprising at least:
the receiving module is used for receiving the input of control information of an operator;
the processing module is used for processing the control information and generating a corresponding control signal;
the sending module is used for sending the control signal to a controller of the action assembly;
the battery comprises a positive electrode, a negative electrode and a diaphragm, wherein the diaphragm is positioned between the positive electrode and the negative electrode, the negative electrode comprises a negative electrode current collector, the surface of the negative electrode current collector is coated with a negative electrode material, the positive electrode comprises a positive electrode current collector, and the surface of the positive electrode current collector is coated with a positive electrode material; the negative electrode material is a lithium titanium oxide-graphene-lithium titanium oxide composite material which is a particle structure formed by gathering a plurality of hammer-shaped structures on a graphene connector, the hammer head part of each hammer-shaped structure is spherical lithium titanium oxide particles, graphene thin layers distributed on the surfaces of the lithium titanium oxide particles form a graphene conductive network, the hammer handle of each hammer-shaped structure is a graphene rod, the root part of each graphene rod is connected with the graphene connector, the maximum diameter of the cross section of each graphene rod is smaller than the particle size of the lithium titanium oxide particles, and the maximum diameter of the cross section of each graphene connector is smaller than the particle size of the lithium titanium oxide particles; the positive electrode material comprises lithium manganate, a conductive agent and a binder; the diaphragm is a polypropylene/polyethylene composite film; the electrolyte comprises an organic solvent and a lithium salt, wherein the mass ratio of each component of the organic solvent is that ethylene carbonate: propylene carbonate: ethyl methyl carbonate 1:1:1, lithium salt is lithium hexafluorophosphate with concentration of 1M.
2. The implantable medical device of claim 1, wherein the active assembly further comprises:
and the controller is electrically connected with the positive electrode and the negative electrode and is used for receiving a control signal of an external terminal to control the on-off and the intensity of the current between the positive electrode and the negative electrode.
3. The implantable medical device of claim 1, wherein the lithium titanium oxide particles have a particle size of 100-500nm, the graphene thin layer has a thickness of 5-20nm, and the cross-sectional maximum dimension of the graphene connector is 50-300 nm.
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