JP3054551U - Fluorescein fluorescence endoscope cap - Google Patents

Abstract

(57) [Summary] [PROBLEMS] The present invention makes it possible to alternately perform a normal endoscopy and a fluorescein fluorescence endoscopy by being attached to the tip of an electronic endoscope. SOLUTION: A filter cap 2 is provided on a transparent cap 1, and the end of the pocket is designed to cover the objective lens 3. A filter 4 is contained in the pocket 2, and a holder 5 is provided at the bottom of the filter 4. Then, the holder 5 is connected to the wire 6 of the cable release, and when the cable release is pressed and fixed, the filter 4 advances to the front of the objective lens 3. When the cable release is released, the filter 4 retreats from the front of the objective 3. The problem is solved by making it possible to alternate between white light endoscopy and fluorescein fluorescence endoscopy. The availability of fluorescein fluorescence endoscopy will clearly show the extent of early cancer in the mucous membrane and can prevent cancer from being left behind during non-operative treatments such as mucosal resection. In addition, it is expected that very small and flat cancers that have been difficult to be detected can be efficiently detected.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a cap in which a filter pocket is provided and a filter holder in the pocket is connected to a cable release so that a general-purpose electronic endoscope can be used for fluorescein fluorescence endoscopy.

[0002]

[Prior art]

 There is a transparent cap used for endoscopic mucosal resection for early gastric cancer and colorectal cancer.

[0003]

[Problems to be solved by the invention]

 On February 21, 1998, at the Ibaraki Cancer Society, I made a presentation on my invented fluorescein fluoroscopy. The abstract is as follows: (Abstract) Fluorescein fluorescence endoscopy: a new means of determining the extent of invasion of gastric cancer in the mucosa・ Panacheto Co-researcher Keiko Suzuki, Toshikatsu Shibata Pathology Department, Tsuchiura Kyodo Hospital Katsuhiro Sanada, Koichi Shibata, Fumio Kobe, Norio Takiguchi, Koji Ito, Koji Ito Junichi Tazawa Junichi Tazawa Last year, we described blood vessels at this conference. It was reported that the extent of gastric cancer in the mucous membrane could be accurately determined by doing this. Fluorescein angiography with fluorescein sodium is one of the angiography methods in vivo, and is commonly used for many cases such as diabetic retinopathy. We believe that if this method is applied to gastroscopy, it will be possible to accurately determine the extent of cancer. <Subjects and examination methods>: Fluorescent endoscopy is performed in addition to conventional examinations during mucosal resection or preoperative endoscopy for patients diagnosed with cancer by biopsy. Insert an endoscope with a yellow filter (filtration filter) attached to the tip of the lens into the stomach to project the lesion. Then, 5 ml of fluorescein is injected intravenously, and at the same time, a blue filter (excitation filter) is inserted in front of the light source for observation. <Results>: Since the cancerous part glows more or less intensely than the surrounding non-cancerous part, the boundary between the cancerous part and the non-cancerous part can be clearly seen. This is thought to be because there is a marked difference in the density of blood vessels in the mucosa and the vascular permeability of fluorescein between cancerous and non-cancerous parts. <Conclusion>: This new fluorescein fluorescence endoscopy can clearly and accurately determine the extent of cancer in the mucous membrane compared to observation with ordinary light, so mucosal or partial excision can be performed to prevent cancer from being left behind. It is a test that should be carried out by all means. At present, there are infrared endoscopy, autofluorescence endoscopy system and photochemotherapy as special endoscopy to detect the extent of cancer, but fluorescence endoscopy with fluorescein sodium Is completely different. Fluorescent endoscopy using fluorescein sodium has the following features: 1) Fluorescein sodium is routinely used in fundus examinations, so there is no problem with its safety. 2) This fluorescence endoscopy does not require any new large-scale instruments, but can be observed simply by attaching filters to existing instruments, and a sufficiently bright field of view can be obtained. Therefore, it is very economical. 3) This test can detect even very small flat lesions that are difficult to detect, and is therefore expected to be effective in screening cancer at an early stage as screening. Is raised. When performing fluorescein fluorescence endoscopy with the currently widespread electronic endoscope, a filtration filter must be placed before the objective lens at the front end, that is, before the CCD. However, if a filter is installed, observation using ordinary white light becomes impossible.

[0004]

[Means for Solving the Problems]

 According to the present invention, a filter pocket is provided in the cap, and the filter pocket is designed so that the tip of the filter pocket covers only the objective lens when it is attached to the tip of the electronic endoscope, and a filtration filter with a holder is placed in the pocket. When the cable release is connected to the cable release and the cable release is pressed and fixed, the filtration filter advances to the front of the objective lens, and when the cable release is released, the filtration filter retreats and comes off from the front of the objective lens, and the operation of the cable release at hand This solves the problem by making it possible to alternate between white light endoscopy and fluorescein fluorescence endoscopy.

[0005]

[Embodiment of the invention]

 Attach the fluorescein fluorescence endoscopy cap to the tip of the electronic endoscope, adjust the filter pocket so that the tip of the filter covers only the objective lens, and then attach the scope mount and cable to prevent the cap from moving. Secure the release to the endoscope with medical tape. The lesion should be inserted into the stomach and previously diagnosed with cancer by biopsy. When 5 ml of fluorescein is injected intravenously, an excitation filter (blue filter) is inserted in front of the light source, and when the cable release is pressed and fixed, the filter (yellow filter) advances to the end of the filter pocket and before the objective lens. Fluorescein fluorescence endoscopy can be performed. Remove the excitation filter, release the cable release, and retract the filtration filter for normal observation. As we presented at the conference, fluorescein fluorescence endoscopy provides a clearer and more accurate indication of the extent of cancer in the mucosa than normal light observation, so a transparent cap for mucosal resection combined with the present invention can be used. In this case, mucosal resection can be performed while performing fluorescein fluorescence endoscopy, thereby preventing cancer from being left behind. When performing fluorescein fluorescence endoscopy as screening, a wide field of view can be obtained by eliminating the tubular portion of the cap that obstructs the field of view. Since it is known that cancerous areas emit fluorescence different from normal mucosa, mucosal biopsy from such areas can increase the detection rate of cancer.

[0006]

【Example】

 Hereinafter, an embodiment will be described with reference to the accompanying drawings. A filter pocket 2 is provided in a rigid plastic transparent cap 1, and the tip of the pocket extends perpendicularly from the cap so as to cover the objective lens 3. In the pocket 2, a filtration filter (Kodak wratten filter No. 15) 4 having a gelatin filter property is contained. The bottom of the filter 4 is attached to the holder 5. The holder 5 is further connected to the cable 6 of the cable release, and when the cable release is pressed and fixed, the filter 4 advances to the front of the objective lens 3. When the cable release is released, the filter 4 retreats and comes off the front of the objective lens 3.

In use, the scope mounting portion 7 of the cap is fitted so that the fixing claw 8 comes in contact with the endoscope end 9, and the filter pocket 2 is not the light guide 10, the forceps outlet 11 and the nozzle 12 but the objective. Adjust so that only the lens 3 is covered. Further, the scope mounting portion 7 and the sheath 13 of the cable release are fixed to the endoscope with the medical tape 14 so that the cap does not move.

[Effect of the invention]

 As described above, the fluorescein fluorescence endoscope cap of the present invention is mounted on the tip of the currently used electronic endoscope, so that normal endoscopy and fluorescein fluorescence endoscopy can be performed alternately. Becomes possible. As a result, the extent of the cancer in the mucous membrane can be accurately known, and the cancer can be prevented from being left behind during mucosal resection. Fluorescein fluorescence endoscopy is expected to be able to efficiently detect very small cancers that have been difficult to detect. If cancer can be found in a very small time, it can be cured by non-surgical means, which has enormous benefits for patients.

[Brief description of the drawings]

FIG. 1 is an external view showing an embodiment of a fluorescein fluorescent endoscope cap of the present invention.

FIG. 2 is an upper side view showing an embodiment of the fluorescein fluorescent endoscope cap according to the present invention;

FIG. 3 is a front view showing an embodiment of the fluorescein fluorescent endoscope cap according to the present invention;

FIG. 4 is a sectional view showing an embodiment of the cap for a fluorescein fluorescent endoscope of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transparent cap 2 Filter pocket 3 Objective lens 4 Filtration filter 5 Filtration filter holder 6 Cable of cable release 7 Scope mounting part of cap 8 Fixing claw 9 Endoscope tip 10 Light guide 11 Forceps outlet 12 Nozzle 13 Cable release Sheath 14 Medical tape

Claims (1)

[Utility model registration claims] 1. A filter pocket is provided in a cap, and the tip of the filter pocket is designed to cover only an objective lens portion when attached to the tip of an electronic endoscope. A filtration filter with a holder is placed in the pocket, When the filter holder is connected to the cable release and the cable release is pressed and fixed, the filtration filter advances to the front of the objective lens, and when the cable release is released, the filtration filter retreats and can be removed from the front of the objective lens. Fluorescein fluorescence endoscope cap