Norio Daikuzono

Low-power Laserthermia for the Treatment of Small Hepatocellular Carcinoma

Laserthermia by a novel interstitial probe adapted to low power Nd-YAG laser machine was used to treat small hepatocellular carcinoma (HCC). The set condition was 43-45 degrees C in thermocouple with power of 2-3 W and the duration 20-30 min. In the 5 cases studied, 1 had a good result with total necrosis of the tumour without recurrence in 16 months. 1 died of liver failure 2.5 months later although death was not related to the procedure. 1 patient died of progressive disease 18 months later. The remaining 2 had recurrent tumours 5 and 12 months later, although the treated small tumours showed good response. Histological examination showed cell degeneration and necrosis. It is concluded that laserthermia is potentially useful in the treatment of the patients with small HCC.

Experimental and clinical studies on balloon laserthermia using Nd:YAG laser for uterine endometrial cancer

No conservative therapy for endometrial cancer exists. We therefore evaluated the new balloon laserthermia for such cases.

Transurethral balloon laser enhanced thermotherapy in the canine prostate

Hyperthermia is performed for prostate cancer. We examined the selective induction of coagulonecrotic changes in the objective area of the canine prostate in enhancing the effect of hyperthermia and treating the target area with transurethral balloon laser enhanced thermotherapy (TUBAL‐ET) using a light absorbent material.

Laserthermia for the treatment of small hepatocellular carcinoma: a preliminary study

A new designed interstitial probe (hybrid probe) was used to treat small hepatocellular carcinoma(HCC) with laserthermia. Before the human study, testing in normal rabbit liver was done to measure the thermal map. And then laserthermia was studied in human small HCC. The set condition was 43-45° C in thermocouple and the duration of laserthermia was 20 minutes. From the follow-up computed tomography and liver biopsies, laserthermia had tumorcidal effect. It is concluded that laserthermia may be helpful to the patients with small HCC.

The Effectiveness of the Nd: YAG Laser Bipolar Dissector in Laparoscopic Surgery

The Laser Bipolar Dissector(LBD, SLT Japan, Co., Ltd.) hemostatically cut through veins up to 5 mm and arteries up to 3 mm in diameter. The interluminal bursting pressure was above 346 mm Hg after transection. It was clear during laparoscopic procedure that avoiding rebleeding was necessary to observe the operative goals. This report describes the use of the LBD that was attached to a newly developed Kelly clamb to perform a laparoscopic splenectomy. The LBD hemostatically cut the short gastric vessels and the vessels in the attaching ligaments of spleen without clipping. In the LBD procedure, one action, in which the laser energy is initiated through the bipolar probes with simultaneous compression of vessel with them, is necessary to accomplish the transection of vessels. Because the goal of laparoscopic surgery is to be a minimum of operative techniques, it i s therefore reasonable to attempt to use the LBD in laparoscopic surgery. I.緒 言 近年、急速に普及 した腹腔鏡下手術では血管 を安全かっ確実に処理することが手術のポイン トである。現在行なわれている血管処理には(1) 糸 ・クリップを用いるもの、(2)高周波電流を用 いるもの(電 気メス)、(3)レ ーザーを用いるも の、(4)超音波振動による摩擦熱を利用 したもの (ハーモニ ックスカルペル)な どがあるが、出 血を最小限にするための新 しい周辺機器の開発 が望まれている。 レーザーバイポラダイセクタ ー(以 下、LBDと 略す)は ピンセッ ト型をし たNd:YAGコ ンタク トレーザー(波 長1064nm)で