IL33519A - Combined electrode and hypodermic syringe needle - Google Patents

Combined electrode and hypodermic syringe needle

Info

Publication number
IL33519A
IL33519A IL33519A IL3351969A IL33519A IL 33519 A IL33519 A IL 33519A IL 33519 A IL33519 A IL 33519A IL 3351969 A IL3351969 A IL 3351969A IL 33519 A IL33519 A IL 33519A
Authority
IL
Israel
Prior art keywords
electrode
needle
electrodes
hypodermic needle
hypodermic
Prior art date
Application number
IL33519A
Other languages
Hebrew (he)
Other versions
IL33519A0 (en
Original Assignee
Wellcome Found
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from AU47787/68A external-priority patent/AU444665B2/en
Application filed by Wellcome Found filed Critical Wellcome Found
Publication of IL33519A0 publication Critical patent/IL33519A0/en
Publication of IL33519A publication Critical patent/IL33519A/en

Links

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
    • A61N1/0502—Skin piercing electrodes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
    • A61B5/25—Bioelectric electrodes therefor
    • A61B5/279—Bioelectric electrodes therefor specially adapted for particular uses
    • A61B5/28—Bioelectric electrodes therefor specially adapted for particular uses for electrocardiography [ECG]
    • A61B5/283—Invasive
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
    • A61B5/25—Bioelectric electrodes therefor
    • A61B5/279—Bioelectric electrodes therefor specially adapted for particular uses
    • A61B5/294—Bioelectric electrodes therefor specially adapted for particular uses for nerve conduction study [NCS]
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/42—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests having means for desensitising skin, for protruding skin to facilitate piercing, or for locating point where body is to be pierced
    • A61M5/427—Locating point where body is to be pierced, e.g. vein location means using ultrasonic waves, injection site templates
    • 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
    • A61N1/36014—External stimulators, e.g. with patch electrodes
    • A61N1/36021—External stimulators, e.g. with patch electrodes for treatment of pain
    • 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
    • A61N1/36014—External stimulators, e.g. with patch electrodes
    • A61N1/36017—External stimulators, e.g. with patch electrodes with leads or electrodes penetrating the skin

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • Veterinary Medicine (AREA)
  • Vascular Medicine (AREA)
  • Anesthesiology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Biophysics (AREA)
  • Radiology & Medical Imaging (AREA)
  • Hematology (AREA)
  • Cardiology (AREA)
  • Pain & Pain Management (AREA)
  • Pathology (AREA)
  • Surgery (AREA)
  • Molecular Biology (AREA)
  • Medical Informatics (AREA)
  • Dermatology (AREA)
  • Physics & Mathematics (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)
  • Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)

Description

n'Tiy~nn ρητο-βηηι m o * >τ at7» Combined electrode and hypodermic syringe needle THE WELLCOME FOUNDATION LIMITED 0.-31744 hlB invention relates to a hypodermic syringe needle which embodies an electrode (or electrodes) for applying electrical stimulus to a patient.
The needle/electrode in accordance with the present Invention (as hereinafter defined) is adapted to be employed in conjunction with an electrical locator/stimulator, such as that disclosed in the Applicant's Israel patent No.33484 and with a hypodermic syringe attachment.
Thus, the present invention has Its application in surgical work where, inter alia, it is required that a surgeon (or anaesthetist) locate the position of a sensory or motor nerve, which is disposed beneath the skin and tissue of a patient, and that the nerre be identified (by the applicatioa of electrical stimulus) and, thereafter, be treated by the injection of a selected medicament.
Heretofore, the steps of locating and identifying a particular nerve or tissue and, thereafter, of treating that nerve or tissue by injection have been performed as separate and independent functions.
The present invention however obviates such prior art techniques by providing a hypodermic needle consisting of at least two electrode elements which are separately conneoable to an electrical supply, an inner one of said electrodes comprising a hollow tubular electrode which is connectable with a hypodermic syringe attachment and the outer one of said electrodes bing a hollow tubular electrode which la electrically insulated from said Inner electrode, the lower end of both the inner and outer electrodes terminating in a cioiwion, bevelled plane (which constitutes the "tip" of the needle), the area de ined by the inner and outer electrodes in such plane constituting a stimulation son*.
Further, separate, electrodes may be located within the insulated space between the inner and outer electrodes and be separately connectable to, for example, electrical sensory-recording apparatus.
A needle in accordance with one embodiment of the present invention consists of two coaxial electrodes, each being of stainless steel cylindrical tubing, and an inner one of which has a hub portion at its upper end for connection in the normal manner to a hypodermic syringe attachment. Thus, the Inner electrode has the appearance of a more or less conventional hypodermic needle.
The outer electrode is spaced coaxially from the loner electrode and is permanently separated therefrom along Its full length by a suitable insulating material. She outer electrode is also formed with a hub portion at its upper end.
The hah portlone of the Inner and outer electrodes are adapted to be separately connected through flexible leads with an electrical sapply such as an eleotronie nerve locator/stimulator.
A portion of the length of the outer electrode, intermediate its hub and lover end, may be encapsulated in a moulded sleeve of steriliaable thermose ting plastic material, whereby the needle nay be conveniently held by an anaesthetist during manipulation and fitting of the syringe attachment. Such sleeve may extend to and partially encapsulate the hub portion of the needle and be apertured to de ine terminal socket portions for electrical connectors to the hubs.
She outer electrode, or the exposed lower end thereof, may be coated with a material having a low co-efficient of friction, such as polytetrafluoroethylene (PTFB).
In use, the needle is connected with an electronic locator/stimulator and inserted into a patient, and, by adopting well known techniques, precise location and identification of a sensory nerve or motor nerve may he achieved. Having located and identified a particular nerve , a hypodermic syringe is attached to the needle (whilst the needle remains in the patient) and a medicament injected as required. Alternatively, location and identification of a particular nerve may he performed with the syringe pre-attached to the needle.
More specifically, the needle, when connected (through flexible leads) with the locator/stimulator device described in the above referenced co-pending application, is inserted into the patient to approximately half the anticipated depth of the nerve to be located from the surface. Thereafter, the output potential of the locator/stimulator is adjusted to approximately 10 volts and the needle is advanced closer to the anticipated position of the nerve. A single pulse output from the locator/stimulator is then initiated to test for response to stimulation.
Upon a response being produced in the patient, the voltage is then reduced below that point where no further response is demonstrated. The needle/electrode is then re-advanced and further tests are made for response to single pulse stimulation. This procedure is repeated until such time as a response can be evoked with a voltage pulse of approximately one volt amplitude. At this point the stimulating tip of the needle should be very close to the nerve to be, for example, blocked.
When the nerve has been located with adequate precision, a local anaesthetic is injected through the needle/electrode (which has until this point been employed purely as a probe) until response to stimulation is no longer demonstrated.
The needle/electrode is retained in position whilst further stimulation and physical examination is employed to confirm that a satisfactory nerve block has been achieved. In the presence of a satisfactory block, motor response to stimulation usually can be demonstrated by applying a potential of approximately 10 volts to the located nerve.
The needle/electrode above defined has obvious advantages in assisting la the reduction of the dosage of local anaesthetic or other chemical agents, thus minimising the risks of drag reaction* Further advantages lie in being able to block nerves which are difficult to locate, particularly deep nerves or those subject to vide anatomical variation, and in blocking specific nerve branches or fibre groups without imairing adjacent fibres.
Attention is drawn to U.S. Patent Speci ication ϋο· 3»078,850, which discloses a combined electrode and hypodermic syringe needle having one electrode only and which is to be used in combination with a body electrode; and to U.S. Patent Specification Ho. 3*313,293, which discloses a multi-electrode needle, wherein the lower end of the central electrode is axially spaced apart from the lower end of the other electrodes; this latter device Is not connectable to a hypodermic syringe* The invention will be more fully understood from the following description of preferred embodiments thereof taken in conjunction with the accompanying drawings wherein, Figure 1 represents an exploded assembly elevation view of needle/electrode, hypodermic sy ings and electrical connectors for the needle/electrode, Figure 2 is a magnified view of the encircled end of the needle/Electrode of Figure 1, Figure 2k is a view, similar to that of fg e 2, showing a modified form of the needle/electrode, Figure 3 is an enlarged elevation view, partly in section, of the needle/electrode of Figure 1, FIGUHE 4 is a section of the needle/ electrode taken along plane 4-4 of Figure 3, and FIGURE 5 is an enlarged elevation view, partly in section, of a modified form of the needle/electrode.
With reference to Figure 1, there is shown a needle/electrode 10 which is adapted to "be secured in a conventional manner, by way of a luer fitting, to the lower end 11 of a hypodermic syringe attachment 12. The needle/electrode 10 comprises two electrodes, as hereinafter described, and U- shaped electrical connector clips 13 are connectable to the respective electrodes.
The connector clips 13 are, in turn, electrically connectable through a two-core flex 14 with output terminals 15 of a locator/stimulator apparatus 16.
The needle/electrode 10 does, as abovementioned, consist of two coaxial electrodes 17 and 18, each being formed of stainless steel.
The inner electrode 17 has a hub portion 19 (i.e., a luer fitting) at its upper end for connection to the syringe attachment 12 and a lower needle portion 20 having a smooth lumen 21. That is, the inner elect-rode 17 has the appearance of a conventional hypodermic needle.
The outer electrode 18 is spaced co-axially from the inner electrode 17 and the two electrodes are separated by a suitable insulating material 22. The suitability of the insulating material 22 is dependent upon its insulating properties over the low voltages employed and upon its ability to withstand sterilisation temperatures or sterilising chemicals. One material found suitable for the purpose is an epoxy resin.
The outer electrode is also formed with a hub portion 24 at its upper end which, as illustrated in Figures 1 and 3 » is similar to the hub portion 19 of the inner electrode, and it has a lower needle portion 25 having a smooth outer surface. Thus the outer electrode 18 has also the appearance of a conventional hypodermic needle.
A permanent connection is made between the hub portions 19 and 24 of the respective electrodes by an epoxy resin or a thermosetting plastic material The needle portions 22 and 25 of the electrodes 17 and 18 terminate in a common bevelled plane, which constitutes the tip 26 of the needle, and the area defined by the inner and outer electrodes at the tip constitutes a stimulation zone.
As illustrated, in part, in Figure 2A additional, fine wire, electrodes 27 may be located in the space between the inner and outer electrodes 17 and 18. Such electrodes 27 may be separately electrically connectable, at a point (not shown) between the hub portions 19 and 24 of the inner and outer electrodes, to electrical sensory-recording apparatus (also not shown) by way of a multi-core flex.
Referring now to Figure 5 wherein the same reference numerals are employed to identify the like parts of the preceding Figures, there is illustrated a needle/ electrode which is in part encapsulated in a moulded sleeve 28 of a sterilisable thermosetting plastic material. The sleeve 28 extends over a major portion of the hub portions 19 and 24 of the two electrodes and for approximately half the length of the outer needle 25.
Terminal apertures 29 are moulded in the sleeve in alignment with contact sockets 30 in the respective hubs, for reception of resilient contact pins (not shown).
With this arrangement the needle/ electrode may be conveniently handled as a probe, prior to fitting of the syringe attachment 12.
Variations and modifications may be made in the embodiments above described without departing from the scope of the appended claims.

Claims (8)

33519/2 ί
1. A hypodermic needle comprising at least two electrode elements which are separately connectable to an electrical supply, an inner one of said electrodes cos-prising a hollow tubular electrode which is connectable with a hypodermic syringe attachment and the outer one of said electrodes bein a hollow tubular electrode which is electrically lnnulntod from said inner electrode* the lower, tip, end of both the inner and outer electrodes terminating in a common bevelled plane, the area defined by the inner and outer electrodes in such plane constituting a stimulation sons*
2. · A hypodermic needle as claimed in Claim 1 wherein said inner and outer electrodes are coaxial.
3. A hypodermic needle as claimed in Claim 1 or Claim 2 wherein there is at least one further electrode located within an insulated space between the inner and outer electrodes, said further electrode(a) being electrically connectable with an external apparatus,
4. · A hypodermic needle as claimed in Claim 3 wherein the, or each, said further electrode comprises a fine wire electrode*
5. · A hypodermic needle as claimed in any one of the preceding laims wherein the inner and outer electrodes both terminate In upper respective hub portions, the hub portion of the inner electrode fitting within that of the outer electrode but being electrically insulated therefrom. 33519/2
6. A hypotonic needle as claimed in any one of the preceding claims wherein the needle is encapsulated oyer a portion of ite length by a moulded sleeve of insulating Material.
7. A hypodermic needle substantially as shown in Figures 1, 2» 3 and 4 of the accompanying drawings and substantially as hereinbefore described with reference thereto.
8. A modification of the hypodermic noodle claimed in Claim 7» substantially as hereinbefore described with reference to Figure 2A of the accompanying drawings. 9· A hypodermic needle substantially as shown in Figaro 5 of the accompanying drawings and substantially as hereinbefore described with reference thereto. For the Applicants ERS EHAtCB
IL33519A 1968-12-13 1969-12-11 Combined electrode and hypodermic syringe needle IL33519A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AU47787/68A AU444665B2 (en) 1968-12-13 Combined electrode and hypodermic syringe needle

Publications (2)

Publication Number Publication Date
IL33519A0 IL33519A0 (en) 1970-02-19
IL33519A true IL33519A (en) 1973-08-29

Family

ID=3734575

Family Applications (1)

Application Number Title Priority Date Filing Date
IL33519A IL33519A (en) 1968-12-13 1969-12-11 Combined electrode and hypodermic syringe needle

Country Status (12)

Country Link
US (1) US3682162A (en)
JP (1) JPS4922435B1 (en)
BE (1) BE743027A (en)
BR (1) BR6915056D0 (en)
CH (1) CH502095A (en)
DE (1) DE1961856A1 (en)
DK (1) DK120040B (en)
FR (1) FR2026069A1 (en)
GB (1) GB1291868A (en)
IL (1) IL33519A (en)
NL (1) NL6918370A (en)
SE (1) SE364444B (en)

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US3682162A (en) 1972-08-08
CH502095A (en) 1971-01-31

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