FR2972053A1 - Method for dye penetrant inspection of engine blades under UV lighting in aeronautical field, involves injecting penetrant products into capillary tube and performing endoscopic visual inspection of part by inspection tube - Google Patents

Abstract

The method involves inserting a cylindrical distal inspection tube (15) of endoscopic equipment via an endoscopic inspection opening (90), close to a mechanical part (91). A capillary tube is inserted in a working channel formed in the inspection tube by positioning under endoscopic visual inspection by the inspection tube emitting a white light. Penetrant products are injected into the capillary tube by transmitting an air flow near a shielded window (10) and a lighting window (11) at a distal end of the inspection tube. The inspection of the part is performed by the inspection tube. An independent claim is also included for an endoscopic equipment.

Description

i

METHOD AND APPARATUS FOR ENDOSCOPIC INSPECTION BY RINSING

The present invention relates to a process for the control of PT under ultraviolet light mechanical parts not directly accessible, using a flexible or rigid endoscopic probe. The present invention applies in particular, but not exclusively to the control of jet blades in the aeronautical field. The reactor vanes to be inspected may have previously undergone mechanical retouching using an endoscopic grinding device called "Blending tool". A method of ultraviolet PT inspection of a mechanical part involves filling any microcracks in the part with a product which may become fluorescent under ultraviolet light, and observing the part under such illumination. More specifically, a bleeding control method of a part comprises a preparation phase of projecting on the part to be successively controlled several more or less aggressive products including in particular: a cleaning liquid to remove pollutants embedded in the microcracks and covering the surface of the workpiece, a penetrating liquid that can become fluorescent when illuminated by ultraviolet radiation, a washing liquid to remove traces of penetrating liquid present on the surface of the workpiece without removing the penetrating liquid embedded in them. microcracks, and a generally powdery developer product for releasing the penetrating liquid present in the microcracks. This control method then comprises an inspection phase of illuminating the part to be controlled by ultraviolet radiation. Such ultraviolet illumination excites the penetrating product present in any microcracks and makes it fluorescent, which reveals any defects that may be very small.

An endoscopic penetrant control consists in applying the control method described above to mechanical parts accessible only by the endoscopic route. An endoscopic system, whether of purely optical technology, as is the case with a rigid endoscope, or opto-electronic as is the case with a videoendoscopic probe with a distal image sensor, essentially comprises a lighting path and a picture channel. The illumination path generally comprises a bundle of illumination fibers housed in an inspection tube and whose distal end illuminates the target to be inspected when its proximal end is connected to a light generator. The image channel includes a distal lens that captures the image of the duly illuminated target, an image transport device, and a display device. In the case of an optical endoscope, the image transport device consists of a lens train, while the display device consists of an ocular lens. In the case of a videoendoscopic probe, the display device consists of a video screen, while the image transport device comprises a distal image sensor, a multicore cable housed in the inspection tube, and a video processor connected to the image sensor by the multicore cable. The video processor has the function of synchronizing the image sensor and transforming the electrical signal provided by the image sensor into a normalized video signal which can be viewed on the video screen. The implementation of endoscopic penetrant inspection involves taking into account a stress related to the projection of different products during the preparation phase, and a stress related to the illumination of the part to be controlled. . The constraint related to the successive projection of the different products, requires the provision of a working channel comprising a distal mouth capable of projecting the products closer to the part to be controlled and a proximal end connected to an injection device 30 products. Generally defined by the users, the injection devices may comprise injection syringes, aerosol cans in which the products to be sprayed, pistols supplied with compressed air, or pneumatic pressure containers. The stress related to lighting results from the need to be able to observe in white light the projection of penetrant materials, and in ultraviolet (UV) light the part to be controlled. The light generator connected to the proximal end of the light fiber bundle housed in the inspection tube must be able to provide, at the option of the operator, either white light or UV light. The beam of lighting fibers must therefore be able to transmit both white light and UV light. For this purpose, the selected lighting beam may consist of quartz fibers or a polymer capable of transmitting UV radiation. The patent applications FR 2 857 094 and US 2005/0200842 describe a rigid tubular cannula whose proximal part allows the lateral injection of bleeding products and whose distal end allows their lateral projection. The cannula is also designed to receive a traditional endoscope with a side view connected to a white light generator and to observe the projection of bleeding products on the test piece. The observation of the bleeding proper is carried out with the aid of a second endoscope completely independent of the cannula, connected to a UV light generator. Such a "UV" endoscope is for example described in patent applications FR 2 861 185 and US 2005/0085698. The use of such a system with two endoscopes is complex, and the cannula is not intended to project, and simultaneously, to visualize the bleeding products directly on the test piece. The videoendoscopic probes used to date for endoscopic penetrant testing include a distal head, a bowing device for orienting the distal head into space, a lighting device, a flexible working channel, and a handgrip. control connected to the béquillage and the distal head by a flexible inspection tube. The distal head houses a small optoelectronic device including an image sensor and a lens. The objective is associated with the image sensor so as to form an image on the photosensitive surface of the image sensor. The image sensor may be of the CMOS or CCD sensor type. The control handle houses an image processing device connected to the image sensor by a multicore electrical cable housed in the inspection tube. The image processing device generally comprises a video processor having the function of synchronizing the remote image sensor at the distal end of the probe and transforming into a standard video signal the electrical signal provided by the image sensor. . The lighting device comprises an optical fiber bundle capable of transmitting white or UV light. The fiber bundle has a distal end disposed in the distal head, and a proximal end connectable to a light source. s The videoendoscopic probe can be associated with a number of ancillary functions such as video display monitor, video image recorder, keypad, power supply, ultraviolet light generator, etc. Each of these ancillary functions may be either integrated in the control handle, or connected to the proximal end of an umbilical cord whose distal end is integral with the control handle. The working channel, housed in the inspection tube, has a distal mouth accommodated in the distal head and a proximal end opening outwardly from the control handle to allow the injection into the test piece of different products. necessary for penetrant testing. The light fiber bundle is connectable to a visible light source to control the emission of bleeding products, and a UV source to observe the fluorescence of the penetrant liquid. The balancing device comprises a proximal end 20 integral with the distal end of the inspection tube and a distal end integral with the distal head. The inspection tube then houses four flexible guiding sleeves of four control cables of the orientation of the béquillage. The control handle comprises a device for actuating the four control cables of the distal crotch, this device being able to be itself controlled by means of directly manual means or by motorized means themselves controlled by a joystick with manual action. The distal mouth of the working channel which is in the distal head can therefore be oriented in space through the béquillage. U.S. Patent No. 5,115,136 discloses a flexible inspection tube videoendoscopic probe for performing bleed control. In reality, the endoscopic systems in accordance with the architectures described above are practically unusable because of the rapid pollution, both of the working channel and of the distal objective, by the different penetrant products successively injected into the working channel.

It is therefore desirable to be able to perform an endoscopic inspection by bleeding while avoiding that the products used for bleeding dirty the working channel, the distal end of the endoscopic system and a lighting window at the distal end of the tube. 'inspection.

Embodiments are directed to a bleed-room inspection method, comprising the steps of: inserting an inspection tube of endoscopic equipment, through an endoscopic inspection port, proximate a mechanical part to be controlled, inserting a capillary tube in a working channel formed in the inspection tube, by positioning under endoscopic visual control by means of the inspection tube emitting a white light, the distal mouth of the capillary tube which emerges from the distal end of the working channel, in the immediate vicinity or in contact with the part to be controlled, injecting bleeding products into the capillary tube inserted in the working channel, by transmitting a flow of air close to viewing and lighting windows at the distal end of the inspection tube, and perform an endoscopic visual inspection of the test piece, using the inspection tube emitting light. ultraviolet light. According to one embodiment, the flow of air is transmitted by a space inside the working channel where the capillary tube is engaged and outside the capillary tube, the viewing and lighting windows being located on a distal face of a distal head of the inspection tube from which the capillary tube opens. According to one embodiment, the flow of air is transmitted by a blowing tube separate from the working channel, housed in the inspection tube, and opening out parallel to the viewing and lighting windows located laterally on the tube. 'inspection. According to one embodiment, the positioning of the distal end of the capillary tube is effected by means of distal bowing at the distal end of the inspection tube which is flexible. According to one embodiment, the positioning of the distal end 35 of the capillary tube comprises a step of angular positioning of a finger hinged to the distal end of the inspection tube which is rigid, the angular positioning of the finger being made between an axial position in the axis of the inspection tube and a position perpendicular to the axis of the inspection tube. According to one embodiment, the method comprises capillary tube changing steps inserted into the working channel each time a new penetrant material is injected into the working channel. According to one embodiment, the method comprises steps of connecting a bundle of illumination fibers connected to the illumination window to a white light source for positioning the distal mouth of the capillary tube in proximity to the part to be inspected and the injection of penetrant materials, and an ultraviolet light source for visual inspection of the part to be inspected. Embodiments also include endoscopic equipment including: a distal head provided with illumination and vision windows, an inspection tube having a distal end integral with the distal head, an image transmission channel connected to the viewing window and a lighting transmission channel connected to the lighting window, a control handle secured to the proximal end of the inspection tube, and a working channel housed in the inspection tube and comprising a distal end opening into the distal head and a proximal end emerging outside the control handle, the working channel being shaped to receive a capillary tube used to project on the part to be controlled different products necessary for control by bleeding, means for orienting the distal head in the space, and means for blowing air near the viewing windows on and lighting. In one embodiment, the endoscopic equipment includes means for injecting air into a space between the working channel and a capillary tube introduced into the working channel. According to one embodiment, the endoscopic equipment comprises a blowing tube separate from the working channel, housed in the inspection tube, and opening out parallel to the viewing and lighting windows located laterally on the inspection tube.

In one embodiment, the endoscopic equipment includes distal tilting at the distal end of the flexible inspection tube to spatially orient the distal head. According to one embodiment, the endoscopic equipment comprises a finger hinged to the distal end of the inspection tube which is rigid, the articulated finger having an axial channel into which a capillary tube engaged in the working channel can be introduced. the hinged finger being associated with angular positioning means for positioning the hinged finger between an axial position in the axis of the inspection tube and a position perpendicular to the axis of the inspection tube. Embodiments also relate to a bleeding tool comprising a hollow tube adapted to receive an inspection tube of an endoscope, the hollow tube comprising: a distal lateral opening to reveal windows of vision and illumination of the endoscope, a working channel in which a capillary tube may be introduced, a distal hinged finger having an axial channel in which may be introduced the distal end of a capillary tube engaged in the working channel, the hinged finger being associated angular positioning means for positioning the hinged finger between an axial position in the axis of the hollow tube and a position perpendicular to the axis of the hollow tube, and an air blowing tube separate from the working channel, opening near the windows of vision and lighting.

Exemplary embodiments of the invention will be described in the following, without limitation in connection with the accompanying figures in which: Figure 1 shows in perspective an endoscopic equipment with rigid inspection tube, adapted to bleed control In ultraviolet illumination, according to one embodiment, FIG. 2 shows in perspective an endoscope belonging to the endoscopic equipment of FIG. 1, FIG. 3 is a perspective view of a bleeding tool belonging to the endoscopic equipment. 1A, according to one embodiment, FIG. 3A is a perspective view of the distal end of the bleeding tool, FIG. 3B is a perspective and longitudinal sectional view of the tool of FIG. 4 is an exploded perspective view of the distal end s of the bleeding tool, FIG. In partial axial section, there is shown a flexible videoendoscopic probe suitable for ultraviolet light penetrant testing. According to one embodiment, FIG. 5A shows in perspective the distal end of the videoendoscopic probe. Figures 1 to 5 show endoscopic equipment adapted to the implementation of a penetrant inspection method under ultraviolet light. According to one embodiment, these endoscopic equipments comprise: an endoscopic visual inspection tube, a white light and UV light illumination device, associated with the inspection tube, a working channel formed in the tube of inspection, into which can be introduced a capillary tube for projecting directly on the target various products necessary for the implementation of a bleeding control, a mechanical means at the distal end of the inspection tube, allowing, under endoscopic visual control and under white light, to position the distal mouth of the capillary tube emerging from the working channel, in the immediate vicinity or in contact with the part to be controlled, and a channel for transmitting an air flow to clean viewing and lighting windows at the distal end of the inspection tube. According to one embodiment, the bleeding control method comprises the steps of: inserting the inspection tube of the endoscopic equipment through an endoscopic control port 90 of a mechanical part to be controlled 91, positioning under control visual endoscopic and under illumination in white light, the distal end of the inspection tube near the piece to be controlled, - insert a capillary tube in the working channel, positioning under endoscopic visual control and under white light illumination the distal mouth of the capillary tube which emerges from the distal end of the working channel, in the immediate vicinity or in contact with the part to be controlled, - inject bleeding products into the capillary tube inserted in the working channel, transmitting an airflow near vision and lighting windows at the distal end of the inspection tube, and - performing a control endoscopic visualization, under illumination in ultraviolet light, of the part to be controlled. By blowing air near the viewing and lighting windows, there is no need at any time to remove the inspection tube from the endoscopic inspection port, especially during or after the projection. penetrant materials on the part to be checked, ls to clean the windows of vision and lighting, until the end of the visual inspection of the room under illumination in UV light. Such a withdrawal operation is indeed to be avoided because it turns out to be penalizing for the duration of the control of a part. It may be preferable to avoid mixing the various bleeding products. In this case, a different capillary tube can be used for the injection of each penetrant. The capillary tubes used can thus be for single use. In the case where the equipment comprises a flexible videoendoscopic probe, a flow of air is injected into an annular volume between the capillary tube and the working channel, during the injection of the penetrant materials. It has been found that the injection of air into the working channel during the injection of the bleeding products, combined with the fact that the capillary tube emerges from the distal end of the working channel, contributes to greatly reducing the pollution of both the working channel and the distal lens 30 and the illumination window of the videoendoscopic probe. Figure 1 shows an endoscopic equipment with rigid inspection tube, according to one embodiment. The equipment comprises an endoscope 2 of the lateral aiming type (or prograde), and a bleeding tool 1 associated with the endoscope 2. The endoscope 2 is represented in particular on the 2972053 io

Figure 2, and the bleeding tool 1 is shown in Figures 3, 3A, 3B, 4 and 4A. In FIGS. 1 and 2, the endoscope 2 comprises a proximal handle 3 and a rigid distal inspection tube 4. In FIG. 1, the tube 4 s is engaged in an inspection tube 15 of the bleed tool 1. The handle 3 comprises a focusing ring 6 and an eyepiece 7 housed in a proximal lens 8 may be connected to an endoscopic camera. The endoscope 2 comprises a lighting light transmission path comprising a bundle of illumination fibers (not shown) extending into a lighting cable 5 integral with the handle 3. The distal portion of the tube 4 comprises a porthole 10 at the distal end of an optical channel image of the endoscope 2, and a window 11 behind which can be glued the previously polished distal end of the bundle of lighting fibers. The fibers of the illumination fiber bundle are of a material capable of transmitting visible light and UV light, for example quartz or a polymer capable of transmitting both white light and UV light. In FIGS. 1, 3, 3A, 3B and 4, the bleeding tool 1 comprises a proximal handle 13 and the distal cylindrical inspection tube. The tube 15 has a distal lateral opening 23 in which are positioned the viewing window 10 and the illumination window 11 of the endoscope 2 (FIG. 1). In FIGS. 1, 3, 3A, 3B and 4, the distal end of the tube 15 is integral with an articulated finger 24 having an internal channel 28 opening on one side on an orifice 25, and on the other side, in A working channel 27. The working channel 27 opens onto the handle 13, in a base 18 constituting the proximal end of the working channel. The working channel 27 is provided to allow the passage of a flexible capillary tube 70 (Figure 3B), capable of being introduced by the base 18 and out through the orifice 25. Such a capillary tube is intended for projection bleeding products on a test piece. The handle 13 further comprises a control ring 16 for manually adjusting the angulation of the hinged finger 24. The handle 13 may also comprise a base 17 connectable to a source of compressed air, in communication with a blowing tube. air 26 opening into the opening 23, parallel to the porthole 10 and the illumination window 11. ii

In FIGS. 3, 3B and 4, the handle 13 comprises a cylindrical proximal housing 20 designed to receive a cylindrical distal portion 9 of the handle 3 of the endoscope 2. The housing 20 comprises a distal partition 14 provided with an axial orifice constituting the proximal end of an internal cylindrical tube 19 intended to receive the tube 4 of the endoscope 2. Means for assembling and fixing the handle 3 in the housing 20 may comprise an indexing device and lock (not shown) for correctly positioning the distal end of the tube 4 of the endoscope under the distal opening 23 of the bleeding tool 1. The ring 16 for controlling the angulation of the distal articulated finger 24 comprises a internal helical slot in which the free end of a radial finger 22 flows, integral with a tubular shuttle 21. The shuttle 21 is integral with two longitudinal actuating rods 34, 35 whose function is to control the angular The shuttle 21 ls can circulate longitudinally around the inner tube 19. The handle 13 also comprises a proximal cylindrical piece 31 whose proximal portion has the cylindrical housing 20, and whose tubular distal portion comprises a longitudinal slot 29 in which the finger 22 circulates. The handle 13 also comprises a ring 32 provided with a helical slot 32a in which the finger 22 circulates. The rings 16 and 32 are housed around the distal part of the piece 31. handle 13 also comprises a central piece 33 and a distal piece 37 whose association with the piece 31 allows the handle 13 to be fixedly mounted while forming two lateral orifices permitting the passage and fixing of the bases 17 and 18. The pieces 31 , 33 and 37 can thus be secured for example by means of two screws 37a, 37b engaged in holes provided for this purpose in the piece 37 and coming from The tube 15 houses the following elements: the inner tube 19, the air blast tube 26, the working channel 27, the two rods 34 and 35, the proximal ends of which are integral with the shuttle. 21 and whose distal ends control the angulation of the articulated finger 24, and a distal piece 36 associated with the articulated finger 24.

In particular, in FIG. 4B which represents the distal portion of the tube 15, the distal piece 36 comprises: a proximal tubular cylindrical portion 38 having an internal orifice 39 provided for receiving the distal end of the inner tube 19, s a median tubular housing 40 having the lateral opening 23 and a distal partition 41, this housing being designed to receive the distal end of the tube 4 of the endoscope 2 introduced into the inner tube 19, two longitudinal distal lugs 42 each having a transverse orifice 43, 10 a longitudinal channel whose proximal end receives the blowing tube 26 and whose distal end opens into the housing 40, a longitudinal channel whose proximal end receives the working channel 27 and whose distal portion opens between the two ears 42, and two longitudinal channels opening between the two ears 42, provided for receiving the operating rods 34 and 35, and in the The rods 34, 35 can slide. The distal portion of the inner part 36 is associated with an inner pulley 45 comprising an axial orifice 51 and an annular groove 46 intended to guide the capillary tube 70 introduced into the working channel 27 by the base 18. The articulated finger 24 comprises at its proximal end two lugs 52 each having a proximal transverse orifice 47 and a distal transverse orifice 50. The piece 36, the pulley 45 and the articulated finger 24 are assembled by a cylindrical axis 44 passing successively through the orifice 43 of the one of the distal ears 42 of the piece 36, the orifice 47 of one of the proximal ears 52 of the finger 24, the orifice 51 of the pulley 45, the orifice 47 of the other of the proximal ears 52, and finally the orifice 43 of the other distal ears 42. The assembly of the hinged finger 24 and actuating rods 34, 35 30 is performed separately for each rod with a respective transverse cylindrical axis 49, introduced into the distal orifice 50 one of the two ears 52 of the finger 24, then in an orifice 48 provided at the distal end of each actuating rod 34, 35. The finger 24 can thus rock and be positioned angularly between an axial position, in the axis of the tube 15 (Figure 3), and a position perpendicular to the axis of the tube 15 (Figure 3A).

The introduction of a capillary tube 70 in the working channel 18, 27 and then in the channel 28 can be performed when the articulated finger 24 is in the axial position. The positioning of the distal mouth of the capillary tube on the test piece is performed by turning the control ring 16 s to orient the pallet 24 towards a direction perpendicular to the axis of the tube 15, and by adjusting under visual control to the endoscope 2, the length of the distal portion of the capillary tube which protrudes from the finger 24. FIG. 5 represents a flexible videoendoscopic probe adapted to control by bleeding under illumination by UV light. The videoendoscopic probe 10 conventionally comprises a control handle whose distal end is integral with a flexible inspection tube 78, and whose proximal end is generally integral with an umbilical cable (not shown) making it possible to connect the probe to operating devices such as a light generator.

For bleeding control, the probe control handle is attached to a specific piece 60 whose distal end is fixedly attached to a distal sleeve 77. The piece 60 is a tubular piece having an axial proximal housing in which the control handle is fixed with a distal external thread 61 and an oblique lateral tubular inlet 62, the external end of which has, for example, an internal thread 63. The sleeve 77 which can be made of a flexible material proximal end of the inspection tube 78. The inspection tube 78 has a flexible distal tilting 79 and a distal head 80 housing an optoelectronic device including an axial vision optical lens and an image sensor. A nut ring 76 is screwed onto the external thread 61 of the distal axial end of the piece 60 to seal the piece 60 to the sleeve 77. The piece 60 comprises an axial tubular channel housing the following links 30: a bundle of illumination fibers 73, four flexible sheaths 74, and a multi-conductor electric cable 75. The illumination fiber bundle 73 connects without interruption an axial illumination window 82 located on a distal face of the head distal 80, at the proximal end of the umbilical cable of the videoendoscopic probe. The proximal end of the umbilical cable can be connected to a lighting generator that can provide both white light and UV light. The fibers of the illumination beam 73 are made of a material such as quartz or a polymer capable of transmitting both white light and UV light. The four sheaths 74 are intended to guide four flexible control cables whose distal ends are integral with the distal tilting 79 and whose proximal ends are actuated by a manual or motorized control device, which can be housed in the control handle. The multicore electrical cable 75 connects the image sensor housed in the distal head 80 to a video processor that can be housed in the control handle. The main function of the video processor is to synchronize the distal image sensor and to transform the electrical signal delivered by the sensor into a normalized video signal. The image sensor is associated with an objective 81 forming a viewing window also disposed on the distal face of the head 80. The oblique tubular inlet 62 of the part 60 is provided to receive the proximal portion 71 of a channel of The workpiece, which is fixed, for example by gluing in the inlet 62. The proximal portion 71 may be made of a rigid material, for example metal. The distal end of the proximal portion 71 is fixedly secured (by means of a dismountable device for maintenance purposes and not shown) to the proximal end of a flexible proximal portion 72 of the working channel, housed in the inspection tube 78. The distal end of the proximal portion of the working channel 72 opens into an orifice 83 formed on the distal face of the distal head 80 (FIG. 5A). The oblique tubular inlet 62 of the piece 60 comprises a proximal inlet 63 in which is screwed or glued the distal end of an intermediate tubular piece 64, having a distal external thread, a proximal external thread 65 and an internal channel of a corresponding diameter. to the inner diameter of the proximal portion 71 of the working channel. A coupling device 67 comprising a lateral inlet 68 and a proximal axial inlet, may be sealingly associated with the workpiece 64 by means of a ring 66 provided to be screwed onto the proximal end 65 of the workpiece 64 and thereby clamp a O-ring seal. The proximal axial inlet of the device 67 has a diameter slightly greater than that of a flexible capillary 70 may be introduced. The proximal axial inlet of the part 67 can be equipped with a removable sealing cap 69 made of flexible material and having an axial orifice in which the operator can introduce a capillary tube 70 which is capable of sliding in the duct. 71, 72, until its distal portion emerges from the orifice 83 in the distal face of the distal head 80. The lateral inlet 68 of the device 67 is provided to receive compressed air. Under these conditions, the air introduced by the inlet 68 circulates in the annular space between the external surface of the capillary tube 70 and the inner surface of the working channel 71, 72, until it opens through the orifice 83 of the distal head 80. In this manner, the air thus introduced through the inlet 68 can prevent the bleed products projected by the distal mouth of the capillary tube 70 from being deposited on the viewing window 81 and the lighting window. 82 on the distal face of the head 80, and ensure cleaning of these windows. Being able to directly disassemble the coupling device 67 is an important maintenance advantage in that it facilitates periodic cleaning of the working channel 71, 72. According to another embodiment, the lighting device The videoendoscopic probe may comprise at least two LEDs, one emitting white light and the other UV light, both LEDs being installed in the distal end of the probe. In embodiments comprising a bundle of illumination fibers, the illumination fiber bundle may be replaced by or associated with such a liquid light guide capable of transmitting UV light and white light which can be removable.

It will be apparent to those skilled in the art that the present invention is susceptible to various embodiments and various applications. In particular, the invention is not limited to a videoendoscopic probe having no air blowing tube separate from the working channel. The videoendoscopic probe previously described may comprise an air blast tube separate from the working channel and opening into the distal head of the probe so as to send air to the illumination and vision windows. The bleeding tool 1 previously described can be used with endoscopes or videoendoscopes flexible or rigid inspection tube. In the case of an endoscope or videoendoscope with flexible inspection tube equipped with a distal crotch, the viewing and lighting windows can be lateral or axial. In the case where these windows are axial, the tube 15 has an opening for orienting these windows laterally using the béquillage. In the case where these windows are lateral, the crutch 10 is not used.

Claims (13)

REVENDICATIONS1. A bleeding-room inspection method, comprising the steps of: inserting an inspection tube (15, 78) of an endoscopic equipment, through an endoscopic control port (90), near a mechanical part to controlling (91), inserting a capillary tube (70) into a working channel (27, 71-72) formed in the inspection tube, positioning under endoscopic visual control by means of the inspection tube emitting a white light, the distal mouth of the capillary tube which emerges from the distal end of the working channel, in the immediate vicinity or in contact with the part to be inspected, inject bleeding products into the capillary tube inserted into the working channel, transmitting a flow of air near viewing windows (10, 81) and lighting (11, 82) at the distal end of the inspection tube, and performing an endoscopic visual inspection of the test piece, average of the inspection tube being ultraviolet light. The method of claim 1, wherein the airflow is transmitted by a space within the working channel (71-72) where the capillary tube (70) is engaged and outside the tube capillary, the viewing windows (81) and illumination (82) being located on a distal face of a distal head of the inspection tube (78) from which opens the capillary tube. 3. A method according to claim 1, wherein the air flow is transmitted by a blowing tube (26) separate from the working channel (27), housed in the inspection tube (15), and opening out parallel to the viewing windows (10) and lighting (11) located laterally on the inspection tube. The method according to one of claims 1 to 3, wherein the positioning of the distal end of the capillary tube (70) is effected by means of distal tilting (79) at the distal end of the tube. inspection (78) which is flexible. 17 5. Method according to one of claims 1 to 3, wherein the positioning of the distal end of the capillary tube (70) comprises a step of angular positioning of an articulated finger (24) at the distal end of the tube. said inspection (15) being rigid, the angular positioning s of the finger being effected between an axial position in the axis of the inspection tube and a position perpendicular to the axis of the inspection tube. 6. Method according to one of claims 1 to 5, comprising capillary tube changing steps (70) inserted into the working channel io (27, 71-72) each time a new penetrant product is injected. in the working channel. 7. Method according to one of claims 1 to 6, comprising steps of connecting a lighting fiber bundle connected to the lighting window (11, 82) to a white light source for the positioning of the distal mouth of the capillary tube (70) close to the test piece and the injection of the penetrant materials, and an ultraviolet light source for the visual inspection of the test piece. 20 8. Endoscopic equipment comprising: a distal head (23, 80) provided with viewing windows (10, 81) and illumination (11, 82), an inspection tube (4, 15, 78) having a distal end integral with the distal head, an image transmission channel connected to the viewing window and a lighting transmission channel connected to the illumination window, a control handle integral with the proximal end of the light tube; inspection, and a working channel (27, 71-72) housed in the inspection tube and having a distal end opening into the distal head and a proximal end opening out of the control handle, the work being shaped to receive a capillary tube (70) used to project on the piece to be controlled (91) of the different products necessary for bleeding control, means (34, 35, 79) for orienting the distal head (24, 80) in space, and means for blowing air (17, 26, 68) near the viewing and lighting windows. 9. Endoscopic equipment according to claim 8, comprising means (68) for injecting air into a space between the working channel (71-72) and a capillary tube (70) introduced into the working channel. 10 10. Endoscopic equipment according to claim 8, comprising a blowing tube (26) separate from the working channel, housed in the inspection tube (15), and opening out parallel to the viewing windows (10) and lighting (11). ) located laterally on the inspection tube. 15 The endoscopic equipment according to one of claims 8 to 10, comprising a distal tilt (79) at the distal end of the inspection tube (78) which is flexible to spatially orient the distal head (80). . 20 12. Endoscopic equipment according to one of claims 8 to 10, comprising an articulated finger (24) at the distal end of the inspection tube (15) which is rigid, the articulated finger having an axial channel (28) in which may be introduced a capillary tube (70) engaged in the working channel (27), the hinged finger being associated with angular positioning means (16, 34, 35) for positioning the hinged finger between an axial position in the axis of the inspection tube and a position perpendicular to the axis of the inspection tube. 13. A bleeding tool comprising a hollow tube (15) for receiving an inspection tube of an endoscope, the hollow tube comprising: a lateral opening (23) for revealing viewing windows (10) and illumination (11) of the endoscope, a working channel (27) in which a capillary tube (70) can be introduced, a distal hinged finger (24) having an axial channel (28) into which the end can be inserted. distal of a capillary tube (70) engaged in the working channel (27), the hinged finger being associated with angular positioning means (16, 34, 35) for positioning the hinged finger between s an axial position in the axis of the hollow tube and a position perpendicular to the axis of the hollow tube, and an air blowing tube (26) separate from the working channel, opening near the viewing windows (10) and lighting (11) .