1. History of Invention & Role of Muscle Stimulator in Pediatric Surgery
M.J.Ansari
General & Pediatric Surgeon
May 2006

2. Introduction
Electronic Muscle Stimulation is an advanced technique used world wide for Testing ,Identification, Repair ,Reconstruction, and other purposes on Skeletal Muscles.

3. Historical Background
The history of Muscle Stimulator is closely related to the history of Anorectoplasty for Imperforated Anus :
Throughout the centuries, doctors have seen and have tried to treat babies born with imperforate anus. Very few patients are described, so most patients are assumed to have died without treatment.

4. Historical Background
Paulus Aegineta (7th century ): earliest report of a survivor of surgery . He suggested rupturing an obstructing membrane with the finger or point of a knife and then dilating the tract until healing was complete. This approach was used for many years.
Scultet (1660 ): anal stenosis with dilatation.
Cooke ( 1676 ) : incision and dilatation and advised care of the sphincter muscles
Bell ( 1787 ) : midline perineal incision to find the bowel.

5. Historical Background
Dubois ( 1783 ) : performing an Inguinal Colostomy for imperforate anus. Other surgeons followed suit, but almost all infants died, so colostomy remained unpopular and only a procedure of last resort.
Amussat ( 1835 ) : Formal Perineal Proctoplasty (ie, mobilization of the bowel through a perineal incision with suturing of it to the skin) this technique gained rapid acceptance
Dieffenbach (1826): described Anal Transposition
Chassaignac( 1856 ): used a probe through a stoma to guide the perineal dissection
Leisrink (1872), McLeod (1880), and Hadra (1884): recommended opening the peritoneum if thebowel was not encountered from below.

6. Historical Background
Wangensteen and Rice (1930 ) :Imaging to delineate the abnormality
Rhoads, Pipes, Randall, Norris, Brophy, Brayton ( ) : Single-stage Abdominoperineal Procedures
Stephens (1953) described this procedure and emphasized preservation of the Puborectalis Muscle. This surgery and its modifications were the standard approach until 1980.

7. Historical Background
In 1980 , the surgical treatment of the anorectal malformations has changed drastically with the introduction of the Posterior Sagittal Anorectoplasty, an approach developed by Prof. Dr. Alberto Peña, also known as Peña's Surgery

8. Historical Background
This surgical procedure requires a series of technical details to be observed and, a very important one, is the precise location of the external sphincter striated muscle structure, where the rectum is repositioned.

9. Technique of PSARP / Pull-Through
It entails a midline posterior sagittal incision running from the middle portion of the sacrum to the anterior edge of the external sphincter.
The sphincter mechanism is divided in a midline incision, thereby preserving the nerve fibers and decreasing the amount of postoperative pain. The back of the child's buttocks is opened like a book, and all internal structures are exposed.

10. Technique of PSARP / Pull-Through
The rectum is then meticulously separated from the genitourinary tract, dissected, and freed enough to reach its normal site without tension. The fistula site is then closed.

11. Technique of PSARP / Pull-Through
With the use of an electrical muscle stimulator, the limits of the sphincter mechanism are determined and the rectum is placed in its optimal location to achieve the best functional results.

12. Historical Background
This is achieved with the striated muscles electrical stimulation.
This technique and muscle stimulator has been developed by Prof. Pena since 1980 , reported in 1982 , and has been accepted worldwhile .

13. Historical Background
At the same period, Iranian pediatric surgeons were doing different techniques, generally without muscle stimulator.
Cut back, Y-V plasty, Transposition , Sacral Approach( Scharlie ), Abdomino-perineal Pull-through ( Stephens ) were common procedures.
Results were poor for high type malformations.
Mislocation and Incontinence were common.

15. PSARP with Faradic & Galvanic Current
Faradic ( Interrupted ) and Galvanic ( Steady ) current was available on physical therapy devices

16. PSARP with Faradic & Galvanic Current
Stimulation with this device was unsatisfactory and impractical .

17. Development of Device

19. First Operation

20. First Operation with Muscle Stimulator , 26. 11
First Operation with Muscle Stimulator , , Ali-Asghar Children Hospital

22. Post-OP Contraction

23. 1st Version
2nd Version

24. Main Characteristics
The MJA-2 is a muscle stimulator specially developed for this surgical approach. It is a current pulse generator and the pulse amplitude values available cover all the needs, from the initial transcutaneous stimulation to the direct stimulation of the exposed muscles.

25. Main Characteristics
It is easily installed close to the surgical field as it is light, compact, is powered both by AC current and batteries. An acoustical and LCD indicator informs the electrical current flow through the muscle tissue.

26. Main Characteristics Current pulse generator
Pulse amplitude: selectable values are 1-200mA.
Pulse duration: 200 µs
Pulse repetition frequency: 50 pps ( HZ )
Pulse shape: rectangular biphasic
Maximum stimulation voltage: 300 V
Batteries: two, 9 V alkaline.
Dimensions: 190 x 150 x 60 mm
Weight: 670 g (with batteries)

27. Applications
Diagnostic
Therapeutic
Follow-up

28. Applications in Anorectal Malformations
Diagnostic
Anatomy of Muscles
Quality and Force of Muscle Contraction
Anatomical Relation of Muscle to Adjacent Organs
Diagnosis of Mislocatiom

29. Applications in Anorectal Malformations
Therapeutic
General assessment of surgical anatomy
Identification of ant border of sphincter before incision
Identification of midline of muscles during deepening of incision
Recognition of ant and post border of muscle complex before reconstruction
Assessment after completion of operation

30. How to Use Always start with low voltage
40-60 mA over skin
20-40 mA directly over muscle
Moisture skin with saline before contact
Clean blood , clot , and debrie before contact
Repeat test time by time bilateraly

31. Precautions Never use the device on conscious patient
Stimulation with this device is very painful

32. Precautions Do not contact continuously
Continuous contact may result in burn

33. Precautions Do not connect the probe to device by power on
This may result to shortcut and electrical burn .

34. History of Invention & Role of Muscle Stimulator in Pediatric Surgery
M.J.Ansari
General & Pediatric Surgeon
May 2006