Classifications

• • 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
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
  • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
  • H01R13/02—Contact members
  • H01R13/025—Contact members formed by the conductors of a cable end
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
  • H01R2201/00—Connectors or connections adapted for particular applications
  • H01R2201/12—Connectors or connections adapted for particular applications for medicine and surgery

Definitions

• the invention relates to a neurostimulation catheter consisting of a flexible tube made of non-electrically conductive material whose distal end is rounded and which comprises an electrical conductor which extends in the length of the tube to conduct an electrical stimulation current. from one end to the other of the tube.
• Neurostimulation allows the practitioner to ensure that the catheter has achieved the desired goal by reacting the plexus block with electrical excitation from the distal end of the catheter.
• the conductor may be constituted by a metal mandrel introduced into the tube lumen and which must be removed after placing the tube in order to clear the lumen before commissioning of the catheter, as described, for example, in GB 88 03 153, DE 1,807,487 and CA 2,260,080.
• the driver can also be permanently incorporated into the tube to allow stimulation at any time, such as described for example in DE 101 00976, US 5,081,990.
• the invention aims to avoid these disadvantages.
• the conductor by at least one layer of an electrically conductive material applied to the outer face of the side wall of the tube and insulated by a non-conductive coating applied to the layer, said layer conductive forming at the distal end of the tube a distal ring which conforms to the shape of the rounding of the distal end of the tube and which is not covered by the insulating coating of the layer so as to constitute a neurostimulation contact, and said conductive layer forming at the proximal end of the tube a proximal ring which is not covered by the insulating coating to make an electrical connection.
• the light of the tube remains completely free and the manufacture of the tube remains simple.
• an ink used for the silver tracing of electric tracks with a pen and a resistant acrylic coating also applied to the pen; alternatively an epoxy adhesive containing silver particles, or an ink conductive without binder which in drying leaves only the metal.
• the application is done in a pen, or preferably by screen printing or pad printing. It has already been proposed to apply a conductive ink on the outer face of the wall of a catheter
• the catheter of the invention still has one or more of the following features:
• the conductive layer constitutes a line of calibrated width and thickness
• a split conductive tube is threaded onto the proximal end of the catheter to make an electrical connection with the proximal ring;
• the wall of the conductive tube is cut longitudinally to form at least one resilient tongue intended to ensure electrical contact between the tube and an electrical wire held in contact with the tongue;
• the catheter has a proximal hub; • a fitting is attached to the proximal end of the tube to hold the lead;
• Said layer is constituted by an ink containing silver; Said layer consists of a mixture of solvent and silver powder;
• Said layer has been applied by screen printing, pad printing or inkjet printing.
• Figure 1 is a schematic diagram of the catheter
• FIG. 2 is a perspective view of the proximal end of the catheter according to one embodiment
• FIG. 3 is a longitudinal section of an embodiment of a base for the catheter
• Figure 4 is a perspective of the tubular body of the base
• Figure 5 is a detail view of the conductive tube to be reported on the proximal end of the tubular portion of the catheter according to an embodiment of the invention
• Figure 6 is an exploded view
• FIG. 7 is a perspective view of the catheter with its base ready for use
• Figure 8 is an axial section of an alternative embodiment of the base of the catheter tube, before the introduction of the catheter in the base and the electrical connection;
• Figure 9 is a perspective of the base of Figure 8;
• FIG. 10 shows the same section as that of FIG. 8 after placement of the catheter in the base, tightening of the nut and electrical connection;
• FIG. 11 is a perspective of the base of FIG. 10, and
• Figure 12 is a cross section of the base according to the embodiment at the electrical connection.
• the catheter shown in the figures is constituted by a flexible tube (1) of non-electrically conductive material on the outer face of which has been applied along a line (2) a layer (A) of a conductive material of the electricity extending from the proximal end (1a) to the distal end (Ib) of the tube (1) and which is coated locally with a layer of insulating material (B).
• the conductive layer forms two rings (3,4) of a few millimeters in length and the insulating coating (B) was stopped before these rings.
• One of the rings will be used to power the conductive coating and the other ring will be used to transmit the electrical excitation to the nerves (plexus block) where we want to stimulate or locate the nerves.
• the human body must not be in contact with the conductor, hence the presence of an insulating coating (made of plastic and of solvent for example) on the conductive line, so that it is completely covered.
• the two conducting rings are connected by an insulated conductor.
• the conductive distal ring as an electrical contact, is a good solution for neurostimulating because it is not bulky (thickness 15 to 20 microns), and therefore does not generate a large extra thickness that could hinder the passage of the catheter in a needle ; it makes it possible to use a catheter with an unobstructed and unrestricted distal hole, which is better for the flow rate. This also avoids having to push hard on the injection syringe.
• the ring may marry the shape of the rounded (atraumatic).
• the invention also relates to embodiments of a base to be mounted on the proximal end of a neurostimulation catheter, in particular a catheter according to the invention, equipped with means for holding the catheter in the base and means to provide an electrical connection between a power supply conductor and the conductive coating of the catheter, and adapted to connect the catheter with a device for supplying a solution, for example an injection syringe.
• the base comprises a tubular body (10) on one end (10a) of which can be screwed a nut (11) so as to ensure the compression of an elastomeric sleeve (12) housed in the nut (embodiment of Figures 1 at 7) or in the tubular body (embodiment of Figures 8 to 12) and traversed by the catheter tube when it is introduced into the base; the other end (10b) of the tubular body has a conical inlet passage (taper luer) for connecting the tip of a solution delivery device.
• a conical inlet passage taper luer
• the base has a lateral hole (13) which is formed in the tubular body (embodiment of Figures 1 to 7) or in the nut
• this tube can be in vis-à-vis the lateral hole (13) of the base.
• the catheter tube is pushed into the base until it stops in the base.
• the tongue or tongues of the metal tube bear against the proximal ring of the conductive layer to ensure electrical contact.
• the catheter tube is blocked in the base by the compression sleeve (7) tightened by the nut.
• the stripped electrical wire (9) and covered with a metal ring (11) is pushed into the lateral hole
• the ring can be pushed in force, or fitted and maintained by a screw-nut type system, the lateral hole of the base is then threaded externally and the ring is equipped with a screw nut. In the latter case, the wire is removable.
• the electrical transmission between the catheter and the power supply wire is achieved by direct lateral contact between the conductive coating of the catheter and the wire.
• the proximal end of the catheter tube which comprises the outer conductive layer (A) but which is devoid of the insulating layer, is threaded freely and directly into the base (10), until a stop (19) and is locked in position, by a compression sleeve (12) which is compressed by screwing a nut (8) on the base, as before.
• the base comprises a chamber (15) for receiving the sleeve terminated at its proximal end by a conical wall (16).
• An anti-friction ring (17) can be inserted into the base if too many 'friction between the nut and the sleeve during the compression by screwing, to prevent the twist sleeve.
• the base, the sleeve and the nut are preassembled (without tightening) before introduction of the catheter into the base.
• the entire catheter length introduced into the base is conductive. Beyond the base, the catheter is covered with the electrically insulating coating (B). The nut is screwed to compress the sleeve and block the catheter. The seal is obtained at a proximal portion of the base. The liquid pushed into the female luer of the base reaches the catheter. Su di liquid is introduced between the catheter and the side wall of the lumen (20), it is collected in a very small chamber (18) whose sealing is provided by the sleeve (12) compressed against the cone (16) of the chamber (15) and against the catheter.
• the conductive plug (19) of the electrical line is introduced which will bring the electric current into a lateral hole (13) of the nut.
• the plug comes into contact with the conductive outer surface of the catheter.
• a clipping of the base (21) of this plug in the hole of the nut is possible.
• a silver-based conductive ink is preferably used.
• Silver is an ideal material for its conductivity (its resistivity is very low) and its flexibility (it follows without problem the curvatures of the tube).
• a resistance of approximately 8 ohms is obtained.
• This ink can be a mixture of solvent and very fine silver powder, for a very good electrical conductivity.
• the application can be performed by screen printing, pad printing or even inkjet. These methods of application are not limiting.

Landscapes

• Health & Medical Sciences (AREA)
• Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
• Animal Behavior & Ethology (AREA)
• Orthopedic Medicine & Surgery (AREA)
• Cardiology (AREA)
• Heart & Thoracic Surgery (AREA)
• Engineering & Computer Science (AREA)
• Biomedical Technology (AREA)
• Neurology (AREA)
• Neurosurgery (AREA)
• Radiology & Medical Imaging (AREA)
• Life Sciences & Earth Sciences (AREA)
• General Health & Medical Sciences (AREA)
• Public Health (AREA)
• Veterinary Medicine (AREA)
• Media Introduction/Drainage Providing Device (AREA)
• Materials For Medical Uses (AREA)
• Electrotherapy Devices (AREA)
• Magnetic Treatment Devices (AREA)

Priority Applications (7)

Applications Claiming Priority (2)

Publications (1)

Family

ID=37022960

Family Applications (1)

Country Status (11)

Cited By (1)

Families Citing this family (12)

Citations (10)

Family Cites Families (15)

• 2006
  • 2006-02-02 FR FR0600948A patent/FR2896698B1/fr not_active Expired - Fee Related
• 2007
  • 2007-01-15 PT PT07730823T patent/PT1984071E/pt unknown
  • 2007-01-15 PL PL07730823T patent/PL1984071T3/pl unknown
  • 2007-01-15 JP JP2008552840A patent/JP5146324B2/ja active Active
  • 2007-01-15 ES ES07730823T patent/ES2333484T3/es active Active
  • 2007-01-15 WO PCT/FR2007/000064 patent/WO2007088256A1/fr not_active Ceased
  • 2007-01-15 DE DE602007003689T patent/DE602007003689D1/de active Active
  • 2007-01-15 AT AT07730823T patent/ATE451139T1/de active
  • 2007-01-15 US US12/161,979 patent/US8798766B2/en active Active
  • 2007-01-15 EP EP07730823A patent/EP1984071B1/fr active Active
  • 2007-01-15 DK DK07730823.7T patent/DK1984071T3/da active

Patent Citations (10)

Also Published As

Similar Documents

Legal Events