US3830226A - Variable output nerve locator - Google Patents
Variable output nerve locator Download PDFInfo
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- US3830226A US3830226A US00370223A US37022373A US3830226A US 3830226 A US3830226 A US 3830226A US 00370223 A US00370223 A US 00370223A US 37022373 A US37022373 A US 37022373A US 3830226 A US3830226 A US 3830226A
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- current
- casing
- source
- probe needle
- needle
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio wavesÂ
- A61B5/053—Measuring electrical impedance or conductance of a portion of the body
- A61B5/0531—Measuring skin impedance
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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
- A61N1/36014—External stimulators, e.g. with patch electrodes
- A61N1/3603—Control systems
- A61N1/36034—Control systems specified by the stimulation parameters
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- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S128/00—Surgery
- Y10S128/908—Patient protection from electric shock
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- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Biophysics (AREA)
- Pathology (AREA)
- Dermatology (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Radiology & Medical Imaging (AREA)
- Molecular Biology (AREA)
- Surgery (AREA)
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Abstract
An electrically powered nerve locator designed to be used on animal or human bodies comprising an elongated, hollow casing having a conventional direct current power source mounted therein and electrically connected to current regulator means so as to vary the energy output of the locator. A nerve probe is rotably mounted within the casing in circuit with the power source and the current regulator. A flexible conductor is disposed in electrical contact with the current source and a grounding needle is attached to the free end of the flexible conductor wherein the conductor is disposed and dimensioned to allow the needle to cooperatively engage a test aperture formed in the casing between the current source and the current regulator.
Description
United States Patent [1 1 Staub et al.
[ Aug. 20,1974
1 1 VARIABLE OUTPUT NERVE LOCATOR [75] Inventors: David E. Staub, Clearwater; Carl L.
Foltz, Holiday, both of Fla.
[52] US. Cl. 128/2.1 R, 128/405 [51] Int. Cl. A6ll 5/00 [58] Field of Search l28/2.1 R, 2.1 C, 303.1, 128/303.13, 303.18, 405, 406, 2.06 R, 419 R; 324/51, 53
[56] References Cited UNITED STATES PATENTS 1,548,184 8/1925 Cameron 128/409 2,437,697 3/1948 Kalom l. 128/2.l R
2,949,107 8/1960 Ziegler l28/2.1 R 3,128,759 4/1964 Bellis 128/2.1 R 3,207,151 9/1965 Takagi 128/2.1 R 3,664,329 5/1972 Naylor 128/2.1 R
Primary ExaminerRichard A. Gaudet Assistant Examiner-Lee S. Cohen Attorney, Agent, or Firm-Stein and Orman [5 7 ABSTRACT An electrically powered nerve locator designed to be used on animal or human bodies comprising an elonsource and a grounding needle is attached to the free end of the flexible conductor wherein the conductor is disposed and dimensioned to allow the needle to cooperatively engage a test aperture formed in the casing between the current source and the current regulator.
9 Claims, 6 Drawing Figures PATENTED AUG 2 0 I974 MIA ow 0m 1 VARIABLE OUTPUT NERVE LOCATOR BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a portable, disposable, selftesting nerve locator including elements designed to be used on animal or human bodies such that its energy output may be varied.
2. Description of the Prior Art Various types of nerve locators/stimulators, primarily designed for medical uses, are well known in the art. These type devices have been particularly popular in surgical procedures where identification and monitoring of motor nerves is necessary; e.g., long thoracic and inner coastal nerves and chest surgery, hand and joint surgery, traumatic surgery and head and neck surgery. However, prior art devices have proved to be generally unsatisfactory because of their large size, complexity, cost of manufacturing and difficulty of operation. Furthermore, it is desirable to be able to vary the amount of electrical energy output of the nerve locator. While most body nerves will not respond to less than 2 milliamperes of current, there are some nerves that cannot tolerate this much and may even be impaired to some extent by this great an output.
One such prior art device, U.S. Pat. No. 3,664,329, discloses a nerve locator/stimulator quite similar to the present invention. However, the disclosure of that device does not show means for varying its energy output.
U.S. Pat. No. 3,128,759 discloses a tooth vitality determinin g device having a variable output. Examination of this disclosure reveals, however, that the device is not self-contained or disposable, nor does it disclose the specific structural elements comprising the present invention.
Accordingly, it can be seen that there is a great need for a'portable, disposable, self-testing nerve locator device which includes means for easily varying the energy output thereof.
SUMMARY OF THE INVENTION This invention relates to a nerve locator device which includes means whereby the energy output thereof may be easily varied. More specifically, the device comprises a casing, a source of direct current disposed within the casing and current limiting means mounted in the casing in electrical contact with the source. A nerve probe needle is rotatably mounted at one end of the casing in electrical contact with the current limiting means and a flexible insulated conductor is mounted at the other end of the casing in electrical contact-with the power source. Signal means in electrical series with'the conductor and the source may be mounted within the casing. A grounding needle is in electrical contact with the other end of the conductor. Testing means may be formed in the casing between the source and the current limiting means.
The casing comprises a rigid'tube preferably formed of polyvinyl material or a similar substance capable of being sufficiently durable to withstand'relatively abusive treatment. The casing further includes inwardly extending annular retaining flanges on each end thereof to provide a container for other elements of the invention.
A nerve probe needle comprising a blunt electrical or current conducting .probe is rigidly mounted in 'the probe needle retainer. The base of the nerve probe needle extends through the probe needle retainer and is bent across the base of the retainer into a slot formed thereon. The probe needle is formed from an insulating material and is rotably mounted within the casing. The base of the probe needle abuts the current limiting means.
The current limiting means is mounted within the casing by engaging a slot formed on the side of the current limiting means with a depression formed in the side of the casing, whereby the current limiting means is locked against rotary motion. The current limiting means comprises a housing having mounted therein a current regulator. The end of the current limiting means contacting the base of the nerve probe needle is constructed so that rotary motion of the needle results in selective engagement of the current regulator, whereby a predetermined current may be passed through the needle. The inner end of the current limit ing means has electrical contact with a conductive disc,
which inturn has electrical contact with a terminal of the direct current source.
The other terminal of the direct current source is in contact with the terminal of the test light bulb. The bulb retainer has an axial opening through which the insulated conductor is threaded, one end of which is in electrical contact with the metal casing of the bulb base,.while its other end is connected to the ground needle.
The testing means comprises an aperture formed in the casing in corresponding relation to a point of contact between the source of direct current and the current limiting means. The'aperture is configured to allow the grounding needle to pass therethrough. To test the device for operativeness the ground needle is inserted in the test aperture formed in the casing. The grounding needle contacts a spring interposed between the direct current source and the current limiting means, thereby bypassing the current limiting means. Thus, the full current output of the source is utilized to energize and light the test light bulb .as a signal that the battery is in working order.
In normal use, the operator first determines the required current output needed for a particular application. The operator then sets the device to deliver this preselected current output by rotating the probe needle retainer. The current output selected is indicated by means of aligning an'index mark formed on the'exterior of the nerve probe retainer with a scale printed around the exterior of the casing. Having thus selected the desired output, the operator nextinserts the ground needle into living subcutaneous tissue. The operator next inserts the probe needle into an incision to locate and- /or stimulate a nerve controlling a motor muscle.
single device can be-setto selectively deliver a variety of current outputs. The device can be presterilized as BRIEF DESCRIPTION OF THE DRAWINGS For a fuller understanding of the nature and objects of the invention, reference should be had to the following detailed description taken in connection with the accompanying drawings in which:
FIG. 1 illustrates the device in the manner of testing.
FIG. 2 is a schematic representation of the series circuit utilized in the device.
FIG. 3 is a sectional view through the casing showing the various structural elements of the present invention in elevation.
FIG. 4 is a longitudinal sectional view taken along line 4-4 of FIG. 3 showing the nerve probe needle mounted in the insulating retainer.
FIG. 5 is an elevational view of the end of the current limiting means which contacts the nerve probe needle.
FIG. 6 is a sectional view taken along line 6-6 of FIG. 5 showing details of the current limiting means.
Similar reference characters refer to similar parts throughout the several views of the drawings.
DETAILED DESCRIPTION This invention relates to a variable output nerve probe device generally indicated as 10 in FIGS. 1 and 3. The device comprises an elongated, hollow casing 12 having inturned annular flanges 28 and 30 formed on the ends thereof, and further includes a nerve probe needle generally indicated as 14 rotably mounted in one end of casing 12. Current limiting means 16 is mounted within casing 12 in electrical series with nerve probe needle 14 and direct current source 18. Flexible insulated conductor 22 is electrically attached to current source 18 at the other end of casing 12. Grounding needle 24 is electrically connected to the free end of conductor 22. Signal means generally indicated as 20 may be mounted in electrical series with conductor 22 and source 18. Testing means 26 may be formed in casing 12 between source 18 and current limiting means 16.
As best illustrated in FIG. 4, nerve probe needle 14 comprises a blunt current conducting probe 32 rigidly mounted in insulating retainer 34. Base 36 of current conducting probe 32 extends beyond the aft end 38 of insulating retainer 34 and is angularly oriented as much as 90 degrees or greater to retainer 34 to fit into correspondingly configured slot 40 correspondingly positioned on retainer 34. A longitudinally extending index mark 42 is formed on the exterior of insulating retainer 34 in corresponding relation to slot 40. Nerve probe needle 14 is rotably mounted in casing 12 and is held in position by engaging annular lip 44 of insulating retainer 34 with inturned annular flange 28. Base 36 of current conducting probe 32 is in electrical contact with current limiting means 16.
As best seen in FIG. 5, current limiting means 16 comprises a housing generally indicated as 46 having mounted therein a current regulator generally indicated as 48. Housing 46 comprises a manifold 50 having formed about the periphery of the end thereof in contact with blunt current conducting probe 32 an annular ridge 52 having formed therein a plurality of notches 54. Current regulator 48 comprises a plurality of resistors 56 mounted in manifold 50 in corresponding relation to notches 54 for individual contact with blunt current conducting probe 32, whereby a predetermined current is passed through nerve probe needle 14. Current limiting means 16 is mounted in casing 12 by engaging longitudinal grooves 58 formed along the periphery of manifold 50 with depression 60 formed in casing 12, whereby current limiting means 16 is locked against rotary motion. The inner end of current limiting means 16 has electrical contact with disc 62. Current limiting means 16 and disc 62 are maintained in position by the outward biasing force of conductive spring 64, as best seen in FIG. 3. The inner end of conductive spring 64 is in electrical contact with direct current source 18.
The other terminal 66 of direct current source 18 is in electrical contact with signal means 20. Signal means 20 comprises test light bulb 68 and bulb retainer 70 mounted in casing 12 in series with direct current source 18 and flexible insulated conductor 22. Signal means 20 is mounted in casing 12 by engaging annular shoulder 72 of bulb retainer 70 with inturned annular flange 30, and is maintained in position by the outward biasing force of conductive spring 64. Terminal 66 of direct current source 18 is in contact with terminal 74 of test light bulb 68. Bulb retainer 70 has an axial opening 76 through which flexible insulated conductor 22 is threaded, one end of which is in electrical contact with terminal 74, while its other end is connected to ground needle 24.
Thus, it will be seen that in testing the device for operativeness, as illustrated in FIG. 1, where ground needle 24 is inserted through test means 26 to contact conductive spring 64, current limiting means 16 is bypassed, and the full current output of direct current source 18 is utilized to energize and light test light bulb 68 as a signal that the battery is in working order.
In normal use, the operator sets the desired output of the device by rotating insulating retainer 34 to the desired position, as indicated by index mark 42. Ground needle 24 is implanted into living subcutaneous tissue and blunt current conducting probe 32 in inserted in an incision to locate and stimulate a nerve controlling motor muscle. Where the nerve probe needle is touched to exposed nerve tissue, the electical circuit is completed and contraction of normally innervated muscle will occur. Having previously determined by test that the device is in working order, the preselected resistor 56 to deliver the desired output through the tissue being probed will be activated. It will be noted that test light bulb 68 will not light because of reduced current output of the device.
It will thus be seen that the objects made apparent from the preceding description are efiiciently attained, and since certain changes may be made in the above construction without departing from the scope of the invention, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.
It is also to be understood that the following claims are intended to cover all of the generic and specific features herein described, and all statements of the scope of the invention which, as a matter of language, might be said to fall therebetween.
Now that the invention has been described, what is claimed is:
l. A nerve locator device, said device comprising: a casing, a source of direct current disposed within said casing, current limiting means mounted in said casing in electrical contact with said source, a nerve probe needle rotably mounted in said casing in electrical contact with said current limiting means, conductor means electrically connected at one end with said source, a signal means electrically connected in series with both said conductor means and said source, a grounding needle means electrically connected with said conductor means, and means formed in said casing between said source and said current limiting means for allowing electrical contact between said grounding needle means and a point of contact between said source and said current limiting means.
2. A device as in claim 1 wherein said nerve probe needle comprises a current conducting probe rigidly mounted in an insulating retainer, the base of said nerve probe needle being configured to selectively engage said current limiting means whereby a predetermined current is passed through said nerve probe needle.
3. A device as in claim 2 wherein said base extends beyond the aft end of said insulating retainer and is angularly oriented as much as 90 or greater to fit into a correspondingly configured slot correspondingly formed in said insulating retainer aft end.
4. A device as in claim 2 wherein said insulating retainer includes an index mark formed thereon in corresponding relation to the point of contact of said nerve probe needle with said current limiting means.
5. A device as in claim 1 wherein said means comprises an aperture formed in said casing in corresponding relation to the point of contact between said source and said current limiting means, said aperture being correspondingly configured as said grounding needle means.
6. A device as in claim 1 wherein said current limiting I means comprises a housing having mounted therein a current regulator.
7. A device as in claim 5 wherein said housing comprises a manifold, said manifold having an annular ridge formed about the periphery of the end thereof in contact with said nerve probe needle, said ridge having a plurality of notches formed therein, said current regulator comprises a plurality of resistors, said resistors being mounted in said manifold in corresponding relation to said notches for individual contact with said nerve probe needle whereby a predetermined current is passed through said nerve probe needle.
8. A device as in claim 5 wherein said current regulator comprises a potentiometer, said potentiometer being mounted in said housing and configured for contact with said nerve probe needle at a plurality of points, said contact at each of said points allowing a predetermined current to pass through said nerve probe needle.
9. A device as in claim 1 wherein said signal means comprises a test light bulb and a bulb retainer mounted in said casing electrically connected in series with said conductor means and said source.
Claims (9)
1. A nerve locator device, said device comprising: a casing, a source of direct current disposed within said casing, current limiting means mounted in said casing in electrical contact with said source, a nerve probe needle rotably mounted in said casing in electrical contact with said current limiting means, conductor means electrically connected at one end with said source, a signal means electrically connected in series with both said conductor means and said source, a grounding needle means electrically connected with said conductor means, and means formed in said casing between said source and said current limiting means for allowing electrical contact between said grounding needle means and a point of contact between said source and said current limiting means.
2. A device as in claim 1 wherein said nerve probe needle comprises a current conducting probe rigidly mounted in an insulating retainer, the base of said nerve probe needle being configured to selectively engage said current limiting means whereby a predetermined current is passed through said nerve probe needle.
3. A device as in claim 2 wherein said base extends beyond the aft end of said insulating retainer and is angularly oriented as much as 90* or greater to fit into a correspondingly configured slot correspondingly formed in said insulating retainer aft end.
4. A device as in claim 2 wherein said insulating retainer includes an index mark formed thereon in corresponding relation to the point of contact of said nerve probe needle with said current limiting means.
5. A device as in claim 1 wherein said means comprises an aperture formed in said casing in corresponding relation to the point of contact between said source and said current limiting means, said aperture being correspondingly configured as said grounding needle means.
6. A device as in claim 1 wherein said current limiting means comprises a housing having mounted therein a current regulator.
7. A device as in claim 5 wherein said housing comprises a manifold, said manifold having an annular ridge formed about the periphery of the end thereof in contact with said nerve probe needle, said ridge having a plurality of notches formed therein, said current regulator comprises a plurality of resistors, said resistors being mounted in said manifold in corresponding relation to said notches for individual contact with said nerve probe needle whereby a predetermined current is passed through said nerve probe needle.
8. A device as in claim 5 wherein said current regulator comprises a potentiometer, said potentiometer being mounted in said housing and configured for contact with said nerve probe needle at a plurality of points, said contact at each of said points allowing a predetermined current to pass through said nerve probe needle.
9. A device as in claim 1 wherein said signal means comprises a test light bulb and a bulb retainer mounted in said casing electrically connected in series with said conductor means and said source.
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US00370223A US3830226A (en) | 1973-06-15 | 1973-06-15 | Variable output nerve locator |
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US00370223A US3830226A (en) | 1973-06-15 | 1973-06-15 | Variable output nerve locator |
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Cited By (108)
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