OLYMPUS On-Demand Library
Add to Watch


Dr. Haruhiro Inoue
Showa University Koto Toyosu Hospital, Digestive Disease Center


  • Achalasia is a primary esophageal motility disorder. A-chalasia means "no relaxation" in Greek. The main symptoms of achalasia are dysphasia (Swallowing difficulty), regurgitation of undigested food and chest pain. Dysphagia tends to become worse slowly but progressively.

  • POEM (Per-Oral Endoscopic Myotomy) is a newly developed endoscopic procedure intending eternal cure from the disease. In POEM procedure esophageal myotomy is done similar to conventional surgery, but with no incision.

  • Several thousand cases in various grades of achalasia received POEM procedure worldwide. Clinical results are excellent with no major complications with skillful doctors' hands.


TriangleTipKnifeJ (KD-645L)

Model Min. working channel Ø Working length Cutting knife length Cutting knife diameter Triangular tip length Triangular tip thickness Sterile, single-use Built-in handle
KD-645L 2.8 mm or more 1,650 mm 4.5 mm 0.4 mm 0.4 mm 0.3 mm Yes Yes

TriangleTipKnife J


Flushing pump - OFP-2

Electrosurgical unit - ESG-300

Setting for Electrosurgical unit ESG-300

Procedure Mode Power [w] Effect
Incision PulseCut slow 30 2
Dissection SprayCoag 30 3
Myotomy SprayCoag 30 3
Hemostasis by knife SprayCoag 30 3
Hemostasis by Coagrasper SoftCoag 50 2

Related Devices

Items Quantity
EVIS EXERA III Video System Center CV-190 1
EVIS EXERA III Xenon Light Source CLV-190 1

EVIS EXERA II Gastroscope GIF-H180J


EVIS EXERA lll Gastroscope GIF-HQ190 / H190

EVIS EXERA lll Gastroscope GIF-XP190N 1
Electrosurgical unit ESG-300 / 400 1
Endoscopic CO2 regulation unit UCR 1
Low flow tubing for UCR MAJ-1742 1
Single Use Electrosurgical Knife TriangleTipKnife J KD-645L 1
Coagrasper FD-411UR 1
Distal Attachment MH-588 1
Injection Needle NM-610L-0426 1
Hemostasis Clip HX-202LR 2
Hemostasis Clip (Long arm) HX-201LR-135L 15


This procedure requires advanced endoscopic skills and should be done with the collaboration between expert endoscopists and expert surgeons. It is also highly recommended to perform the POEM under the guidance of experienced medical doctors especially for initial several cases.


4.1 Pretreatment
4.2 Anesthesia
(1) General anesthesia with controlled ventilation (positive pressure) is required. That means the procedure should be done under control with anesthesiologist.
(2) In a patient with dilated esophagus esophageal content should be cleared with therapeutic endoscope. It potentially avoids aspiration pneumonia during intubation.


5.1 Patient Position
(1) Supine Position
(2) Expose the patient belly (upper abdomen) to check the pneumoperitoneum quickly.
(3) 8% patient of all cases becomes pneumoperitoneum during procedure.

5.2 Configuration
(1) General anesthesia with intratracheal intubation is required. That means the procedure should be done under control of anesthesiologist.
(2) All endoscopic devices should be sterilized with ethylene oxide gas (EOG).