Apparatus and method for optimum electrode placement in the treatment of disease syndromes such as spinal curvature

• US 4,026,301 A
• Filed: 04/21/1975
• Issued: 05/31/1977
• Est. Priority Date: 04/21/1975
• Status: Expired due to Term

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Wickham, Robert W. Jr., Friedman, Harry G.
• Primary Examiner(s): Kamm, William E.
• Application Number:
  US05/569,842
• Time in Patent Office: 771 Days
• Field of Search: 128/2.06 E, 128/2.1 E, 128/404, 128/418, 128/419 C, 128/419 E, 128/419 P, 128/419 R, 128/421, 128/422, 128/423, 128/2 B, 128/347, 128/303 B
• US Class Current: 607/43
• CPC Class Codes: A61B 17/70 Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
• CPC Class Codes: A61N 1/3604 for correcting spinal deformities, e.g. scoliosis

Abstract

A system for the electrical treatment of spinal curvature through the exercise of selected spinal muscles. A probe having a blunt, muscle-penetrating tip is fitted with a sleeve such that its tip extends from the sleeve. A helical electrode is mounted on an elongated tool capable of imparting a rotational force to the electrode while allowing a disengagement with the electrode in the direction of its longitudinal axis. The probe is inserted in the paraspinal muscles and is removed while leaving the sleeve within the muscle. The electrode-tool assembly is inserted through the sleeve and the electrode secured in the paraspinal muscles by a rotational force applied to the tool. After electrode securement, the tool is withdrawn from the sleeve and the sleeve withdrawn from the muscle leaving the electrode secured within the muscle. Needle electrodes may be employed to stimulate the paraspinal muscles at several sites to establish those sites at which the induced muscle contraction provides maximum correction of the spinal curvature and the blunt probe tip may be provided with an electrode for muscle stimulation at varied penetration depths to establish the optimum depth for securement of the helical electrode.

The electrodes are connected by leads to a receiver circuit implantable beneath the patient'"'"'s skin and operable to receive RF modulated stimulation impulses transmitted through the skin. The impulses are developed by a patient operated RF transmitter with a cyclic on and off stimulation and rest periods so that stimulation of the muscles may take place while the patient relaxes or sleeps.

Claims

1. Apparatus for positioning and securing an electrode within paraspinal muscles for use in the electrical treatment of spinal curvature, said apparatus comprising;

sleeve means;

probe means inserted within said sleeve means, said probe means including blunt tip means extending from said sleeve means when said probe means is inserted therein for penetrating said muscle and means engaging said sleeve means for carrying said sleeve means with said probe means during said muscle penetration while allowing said probe means to be withdrawn from said sleeve means and said muscle after said penetration; and

elongated means inserted within said sleeve means after withdrawal of said probe means, said elongated means including means engageable with said electrode for imparting a force thereto while allowing a disengagement with said electrode in one direction along the longitudinal axis of said elongated means.

2. The apparatus of claim 1 wherein said probe means tip means is provided with means for optimizing the position of said sleeve means within said paraspinal muscle.

3. The apparatus of claim 2 wherein said optimizing means comprises electrode means for delivering electrical energy to said paraspinal muscle.

4. Apparatus for positioning and securing within muscle tissue a rotationally inserted electrode having tab means and a conductive lead extending longitudinally therefrom, said apparatus comprising:

sleeve means one end of which penetrates said muscle tissue to a desired depth within said muscle; and

elongated means insertable through the other end of said sleeve means for delivering and securing said electrode within said muscle tissue at a position beyond said one sleeve means end, said elongated means including slot means on one end thereof for accepting said tab means and imparting a rotational force thereto while allowing a disengagement between said tab means and slot means in one direction along the longitudinal axis of said elongated means and said slot means including recess means extending from said one elongated means end in said one direction for accepting said conductive lead within said elongated means from said one elongated means end.

5. The apparatus of claim 4 wherein said sleeve means is provided with a slot throughout its length, said slot being at least as large as said conductive lead.

6. A method of electrode placement for use in an electrical treatment of spinal curvature comprising the steps of:

(a) inserting needle electrodes within the paraspinal muscles adjacent said spinal curvature;

(b) stimulating the paraspinal muscles with an electrical signal applied to said needle electrodes;

(c) determining the relative effect of the stimulated muscle reaction on said spinal curvature;

(d) repositioning said needle electrodes within the paraspinal muscles;

(e) repeating steps (b), (c) and (d) to establish the electrode insertion sites which maximize corrective, stimulated muscle contraction;

(f) removing said needle electrodes;

(g) inserting a blunt probe fitted with a sleeve within said paraspinal muscle at each of the sites established in step (e), said probes having an electrode extending from said sleeve;

(h) stimulating said paraspinal muscles with an electrical signal applied to said probe electrodes;

(i) determining the relative effect of the stimulated muscle reaction on said spinal curvature;

(j) altering the amount of penetration of said probes in said paraspinal muscles;

(k) repeating steps (h), (i) and (j) to establish the electrode depth which maximizes corrective, stimulated muscle contraction;

(l) removing said probes from said paraspinal muscle while leaving said sleeves within said muscle at the sites and depths established in steps (e) and (k), respectively;

(m) inserting electrodes having conductive leads through said sleeves and into engagement with said muscle at the sites and depths established in steps (e) and (k), respectively;

(n) removing said sleeves while leaving said electrodes in engagement with said muscle;

7. The method of claim 6 wherein step (m) comprises the steps of:

(o) positioning a helical electrode on one end of an elongated tool, said elongated tool securing said electrode against rotational movement relative thereto while showing said electrode to be withdrawn from said tool in one direction along the longitudinal axis of said tool;

(p) inserting said one end of said elongated tool through one of said sleeves;

(q) advancing said electrode into contact with said muscle;

(r) rotating said elongated tool to engage said helical electrode with said muscle;

(s) removing said elongated tool while leaving said electrode in engagement with said muscle; and

(t) repeating steps (o) through (s) for each sleeve.

8. Apparatus including an electrode for positioning and securing said electrode within paraspinal muscles for use in the electrical treatment of spinal curvature, said apparatus comprising:

sleeve means;

probe means inserted within said sleeve means, said probe means including blunt tip means extending from said sleeve means when said probe means is inserted therein for penetrating said muscle and means engaging said sleeve means for carrying said sleeve means with said probe means during said muscle penetration while allowing said probe means to be withdrawn from said sleeve means and said muscle after said penetration; and

elongated means inserted within said sleeve means after withdrawal of said probe means, said elongated means including means engageable with said electrode for imparting a force thereto while allowing a disengagement with said electrode in one direction along the longitudinal axis of said elongated means.

9. The apparatus of claim 8 wherein said electrode is a helical electrode having a tab, said means engageable with said electrode comprising slot means in said elongated means for accepting said electrode tab and imparting a rotational force thereto.

10. The apparatus of claim 9 wherein said electrode is secured to, and in electrical communication with, a conductive lead, said elongated means including recess means for accepting said conductive lead.

11. The apparatus of claim 10 wherein said sleeve means is provided with a slot throughout its length, said slot being at least as large as said conductive lead.

12. The apparatus of claim 11 wherein said probe means tip means is provided with means for optimizing the depth of penetration of said sleeve means in said paraspinal muscle.

13. The apparatus of claim 12 wherein said optimizing means comprises electrode means for delivering electrical energy to said paraspinal muscle.

14. Apparatus for establishing the optimum position of an electrode for use in the treatment of disease syndromes by the selective application of electrical stimulation to the body and maintaining said optimum position until positioning and securement of said electrode comprising sleeve means and probe means removably inserted within said sleeve means through one end thereof, said probe means including tip means extending from the other end of said sleeve means for penetrating body tissue and electrode means carried by said tip means in predetermined relation to said sleeve means other end, said probe means being removable from said sleeve means and said body tissue through said one end of said sleeve means and said electrode means being adapted for connection to a source of electrical stimulation energy.

15. The apparatus of claim 14 wherein said tip means comprises blunt, muscle-penetration means.

16. A method of establishing the optimum placement of electrodes to be used in an electrical treatment of spinal curvature comprising the steps of:

(a) inserting needle electrodes within the paraspinal muscles adjacent said spinal curvature;

(b) stimulating the paraspinal muscles with an electrical signal applied to said needle electrodes;

(c) determining the relative effect of the stimulated muscle reaction on said spinal curvature;

(d) repositioning said needle electrodes within the paraspinal muscles;

(e) repeating steps (b), (c) and (d) to establish the electrode insertion sites which maximize corrective, stimulated muscle contraction;

(f) removing said needle electrodes;

(g) inserting blunt probe electrodes within said paraspinal muscle at each of the sites established in step (c);

(h) stimulating said paraspinal muscles with an electrical signal applied to said probe electrodes;

(i) determining the relative effect of the stimulated muscle reaction on said spinal curvature;

(j) altering the amount of pentration of said probes in said paraspinal muscles;

(k) repeating steps (h), (i) and (j) to establish the electrode depth which maximizes corrective, stimulated muscle contraction.

17. A method of establishing the optimum electrode penetration depth within muscle tissue at a predetermined site for use in the treatment of disease syndromes through the selective application of electrical stimulation to the body comprising the steps of:

(a) inserting muscle penetrating a probe within said muscle tissue at said predetermined site, said probe having a probe electrode;

(b) applying a body stimulation signal to said probe electrode;

(c) determining the relative effect of the body reaction to said stimulation signal;

(d) altering the amount of muscle tissue penetration of said probe at said predetermined site; and

(e) repeating steps (b), (c) and (d) to establish the electrode depth which maximizes the desired body reaction.

18. The method of claim 17 wherein the step of inserting comprises the step of inserting a probe fitted with a sleeve, said probe electrode having a predetermined relation to said sleeve, the method further comprising the steps of:

(f) removing said probe while leaving said sleeve at said predetermined site and at the depth established in step (e).

19. The method of claim 18 further comprising the steps of:

(g) inserting an electrode through said sleeve and into engagement with the body tissue at said predetermined site and at the depth established in step (e); and

(h) removing said sleeve while leaving said electrode in engagement with said body tissue.