Endoscope imaging device, endoscope, and endoscope tip cover

Abstract

An endoscope imaging device according to the present invention is provided at a distal end of an insertion section of an endoscope and comprises: an objective optical system; a water supply section which is capable of ejecting liquid toward the objective optical system; an illumination optical system which is provided at the periphery of the objective optical system; a suction opening which is capable of suctioning the liquid ejected by the water supply section; and a guide section which is provided on the side opposite from the the water supply section so as to sandwich the objective optical system in the direction in which the water supply section ejects the liquid, and which is formed so as to be capable of guiding the liquid to the suction opening.

Description

Endoscope imaging device, endoscope, and endoscope tip cover

[0001] The present disclosure relates to an imaging device for an endoscope, an endoscope, and a tip cover for an endoscope.

[0002] In recent years, with the aim of expanding the field of view of endoscopes, endoscopes with an optical field of view greater than 180° have been proposed. For example, by using a fisheye optical system as the objective optical system of an endoscope, an endoscope with an optical field of view greater than 180° can be realized while maintaining operability similar to that of conventional endoscopes.

[0003] Conventional endoscopes often include an illumination optical system for illuminating an object to be observed by the objective optical system. The illumination optical system is mainly provided on the distal end surface of the endoscope together with the objective optical system and is arranged around the objective optical system.

[0004] Furthermore, there is an endoscope that is equipped with a cleaning nozzle that cleans the objective optical system by spraying water, and a suction port that sucks up the water used for cleaning, in order to improve the visibility of the objective optical system (for example, Patent Document 1).

[0005] Patent No. 6050211

[0006] However, when the objective optical system is cleaned with a cleaning nozzle, water droplets may land on the tip of the endoscope or on the illumination optical system, causing the water droplets to be reflected within the field of view of the objective optical system and obstructing the field of view, or the water droplets may affect the dimming and irradiation of the illumination optical system, causing problems with endoscopic observation. In particular, when an objective optical system with an optical field of view greater than 180° is used in an endoscope, the problem of water droplets remaining after cleaning becomes more pronounced.

[0007] In consideration of the above circumstances, the present disclosure aims to provide an endoscopic imaging device, an endoscope, and an endoscope tip cover that can guide and hold remaining water droplets outside the field of view of the objective optical system so that the water droplets do not appear within the field of view, and can also be efficiently sucked in.

[0008] In order to solve the above problems, the present disclosure proposes the following means: The endoscopic imaging device of the present disclosure is an endoscopic imaging device provided at the tip of an insertion section of an endoscope, and includes an objective optical system, a water supply unit capable of injecting a liquid toward the objective optical system, an illumination optical system provided around the objective optical system, a suction opening capable of sucking in the liquid ejected by the water supply unit, and a guide unit provided on the opposite side of the objective optical system to the water supply unit in the direction in which the water supply unit ejects the liquid, the guide unit being configured to be able to guide the liquid to the suction opening.

[0009] The endoscope of the present disclosure includes the above-described endoscopic imaging device at the tip of the insertion section.

[0010] The endoscope tip cover of the present disclosure is an endoscope tip cover that is provided at the tip of an insertion portion of an endoscope, and includes a protrusion in which an objective optical system can be positioned, a water supply opening in which a water supply unit that can inject liquid toward the objective optical system can be positioned, an illumination opening in which an illumination optical system can be positioned, a treatment instrument opening provided adjacent to the protrusion, and a guide section that is provided on the opposite side of the water supply opening across the protrusion in the direction in which the water supply unit injects the liquid, and is formed so as to be able to guide the liquid to the treatment instrument opening.

[0011] The endoscopic imaging device, endoscope, and endoscope tip cover disclosed herein can provide an endoscopic imaging device, endoscope, and endoscope tip cover that can guide and hold remaining water droplets outside the field of view of the objective optical system so that the water droplets do not appear within the field of view, and can also be efficiently sucked in.

[0012] 1A and 1B are diagrams illustrating an endoscope including an endoscopic imaging device according to the present disclosure, a perspective view illustrating the endoscopic imaging device, and a front view illustrating the endoscopic imaging device.

[0013] An endoscope 100 according to this embodiment will be described with reference to the drawings.

[0014] Fig. 1 is a diagram showing an endoscope 100 including an endoscopic imaging device 10 according to this embodiment. Fig. 2 is a perspective view showing the endoscopic imaging device 10. Fig. 3 is a front view showing the endoscopic imaging device 10.

[0015] The endoscope 100 is a flexible endoscope, and includes an insertion section 110 that is inserted into the body from the tip, and an endoscope operation section 120 that is attached to the base end of the insertion section 110.

[0016] In the following description, in the longitudinal direction A of the insertion section 110, the side that is inserted into the patient's body is referred to as the "tip side (distal side) A1", and the side toward the endoscope operation section 120 is referred to as the "base side (proximal side) A2".

[0017] The insertion section 110 has an endoscopic imaging device (imaging unit) 10, a bending section 20, and a flexible section 30. The endoscopic imaging device 10, the bending section 20, and the flexible section 30 are arranged in this order from the tip of the insertion section 110.

[0018] A channel 123 for inserting an endoscopic treatment tool is provided inside the insertion section 110. A tip opening 14 of the channel 123 is provided in the endoscopic imaging device 10 provided at the tip of the insertion section 110.

[0019] The endoscopic imaging device 10 is an imaging unit that includes an objective optical system 12 that can capture an image of a region to be treated. The endoscopic imaging device 10 will be described in detail later.

[0020] The bending section 20 bends in accordance with the operator's operation of the endoscope operation section 120. The flexible section 30 is a flexible tubular section.

[0021] The endoscope operation section 120 is connected to the flexible section 30. The endoscope operation section 120 has a grip 121, an input section 122, a proximal end opening 123a of a channel 123, and a universal cord .

[0022] The grip 121 is a portion that is held by an operator. The input unit 122 receives an operation input for causing the bending portion 20 to perform a bending operation.

[0023] The universal cord 124 includes an imaging cable (not shown) connected to the objective optical system 12, which will be described later, and outputs to the outside the image captured by the endoscopic imaging device 10. The universal cord 124 is connected to a display device such as a liquid crystal display via an image processing device including a processor or the like.

[0024] The universal cord 124 also includes a light guide (not shown) connected to the illumination optical system 13 described later, a water supply tube connected to the water supply unit 15 described later, and an air supply and suction tube (not shown).

[0025] The air supply and suction tube included in the universal cord 124 joins with the channel 123 inside the endoscope 100 and is connected to the distal end opening 14 (described later) via the channel 123 .

[0026] The endoscopic imaging device 10 includes an endoscope tip cover 11 , an objective optical system 12 , an illumination optical system 13 , a tip opening (suction opening) 14 , and a water supply unit 15 .

[0027] The endoscope tip cover 11 is a cover member connected to the tip of the insertion section 110. The endoscope tip cover 11 is made of, for example, a resin material. Details of the endoscope tip cover 11 will be described later.

[0028] The objective optical system 12 includes an imaging element such as a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS), and is capable of capturing an image of the area to be treated.

[0029] The objective optical system 12 has a field axis O1 extending in the longitudinal direction A and has a field angle greater than 180°. The objective optical system 12 is, for example, a fisheye optical system.

[0030] The illumination optical system 13 is an illumination device that is provided around the objective optical system 12 and is capable of irradiating illumination light onto the tip side A1.

[0031] The endoscopic imaging device 10 illuminates a region to be treated by an illumination optical system 13 , and captures an image of the treatment region illuminated by the illumination optical system 13 by an objective optical system 12 .

[0032] The surgeon operating the endoscope 100 observes the treatment target illuminated by the illumination optical system 13 through the objective optical system 12, and can therefore adequately observe the treatment target inside the patient's body.

[0033] 2 and 3, the endoscopic imaging device 10 includes three illumination optical systems 13. Specifically, the endoscopic imaging device 10 includes a first illumination optical system 13a, a second illumination optical system 13b, and a third illumination optical system 13c.

[0034] The number and arrangement of the illumination optical systems 13 included in the endoscopic imaging device 10 can be determined appropriately depending on the illumination performance of the illumination optical systems 13, the internal structure of the insertion section 110, and the like.

[0035] The suction opening 14 is a distal opening of the channel 123 and is an opening that communicates with a proximal opening 123a of the channel 123. As shown in Figures 2 and 3, the suction opening 14 is sandwiched between the first illumination optical system 13a and the second illumination optical system 13b in the circumferential direction C of the field of view axis O1. The suction opening 14 is disposed adjacent to the objective optical system 12.

[0036] The surgeon can supply air and perform suction through the suction opening 14 by operating, for example, an air supply button or a suction button provided on the endoscope operation unit 120. In this embodiment, the suction opening 14 is mainly used for suctioning liquids and the like.

[0037] The surgeon may perform various treatments near the suction opening 14 by inserting an endoscopic treatment tool into the channel 123 from the proximal opening 123a.

[0038] For example, the surgeon may protrude and retract an endoscopic treatment tool such as a high-frequency knife, forceps, or stapler from the suction opening 14 and perform treatment using the endoscopic treatment tool.

[0039] The water supply unit 15 is a water supply device capable of injecting cleaning water for cleaning the objective optical system 12. The water supply unit 15 has a water supply port (not shown) for injecting the cleaning water. The water supply port of the water supply unit 15 is provided facing the objective optical system 12.

[0040] By supplying water from the water supply part 15 to the objective optical system 12, dirt adhering to the objective optical system 12 and the periphery of the objective optical system 12 can be washed away, and the obscuration of the field of view of the objective optical system 12 by the adhering dirt can be suppressed.

[0041] The surgeon can supply water from the water supply unit 15 by operating a water supply button provided on the endoscope operation unit 120, for example.

[0042] For example, by injecting cleaning water from the water supply unit 15 toward the objective optical system 12 to wash away dirt, and then removing the cleaning water after cleaning the objective optical system 12 by sucking it out through the suction opening 14, the surgeon can observe the inside of the patient's body while ensuring a sufficient field of view for the objective optical system 12.

[0043] The suction opening 14 is connected to a pump device via an air supply and suction tube that branches off from the channel 123 and passes through a universal cord 124. The endoscope 100 can suck liquid or the like through the suction opening 14 by driving the pump device connected to the universal cord 124.

[0044] The endoscope tip cover 11 includes a protrusion 1 , an illumination opening 2 , a treatment instrument opening 3 , a water supply opening 4 , a guide portion 5 , and a wall portion 6 .

[0045] The protruding portion 1 is a portion that protrudes from a distal end surface 11s facing the distal end side A1 in the longitudinal direction A. The distal end surface 11s is a surface facing the distal end side A1, and covers at least a portion of the distal end of the insertion portion 110 from the distal end side A1.

[0046] The tip surface 11s is a plane extending in a direction perpendicular to the longitudinal direction A. The tip surface 11s does not need to be strictly perpendicular to the longitudinal direction A, and does not need to be strictly flat.

[0047] The distal end surface 11s has a circular shape in a plan view from the distal end side A1. The distal end surface 11s is not limited to a circular shape, and may have an elliptical or polygonal shape in a plan view from the distal end side A1.

[0048] The endoscope tip cover 11 has a cylindrical shape with a bottom, and is formed by a bottom surface portion including a tip surface 11s and a flange portion extending from the outer periphery of the bottom surface portion toward the base end side A2. The endoscope tip cover 11 does not need to be strictly cylindrical.

[0049] The endoscope tip cover 11 may have any shape as long as it can be connected to the tip of the insertion section 110 , and may have any suitable shape that corresponds to the shape of the tip of the insertion section 110 .

[0050] The protrusion 1 has, for example, a hollow truncated cone shape centered on a field axis O1. As shown in Figures 2 and 3, an objective optical system 12 is disposed in the hollow portion of the protrusion 1.

[0051] By arranging the objective optical system 12 on the protrusion 1 protruding from the distal end surface 11s, the lens on the distal end side A1 of the objective optical system 12 can be arranged protruding from the distal end surface 11s to the distal end side A1.

[0052] Therefore, even when an objective optical system 12 having a field of view greater than 180° is used, the tip surface 11s of the endoscope tip cover 11 can be prevented from being reflected in the field of view range of the objective optical system 12, and the wide field of view of the objective optical system 12 can be effectively utilized to observe the inside of the patient's body.

[0053] The illumination opening 2 is an opening that penetrates the distal end surface 11s in the longitudinal direction A, and is an opening in which the illumination optical system 13 is disposed. In this embodiment, the endoscope distal end cover 11 has three illumination openings 2.

[0054] 2 and 3, the illumination opening 2 is provided around the protrusion 1 in which the objective optical system 12 is provided. The endoscope tip cover 11 is provided with an appropriate number and arrangement of illumination openings 2 corresponding to the number and arrangement of the illumination optical systems 13 of the endoscopic imaging device 10.

[0055] Specifically, the endoscope tip cover 11 has a first illumination opening 2a corresponding to the first illumination optical system 13a, a second illumination opening 2b corresponding to the second illumination optical system 13b, and a third illumination opening 2c corresponding to the third illumination optical system 13c.

[0056] The treatment instrument opening 3 is an opening that penetrates the distal end surface 11s in the longitudinal direction A and is an opening that communicates with the suction opening 14. The treatment instrument opening 3 is provided adjacent to the protrusion 1 and the first illumination opening 2a. The treatment instrument opening 3 can have an appropriate size and shape that correspond to the size and shape of the suction opening 14.

[0057] When air supply and suction are performed from the distal end of the insertion section 110 , the air supply and suction are performed via the treatment instrument opening 3 and the suction opening 14 .

[0058] Furthermore, when an endoscopic treatment tool is protruded or retracted from the distal end of the insertion section 110 , the endoscopic treatment tool inserted into the channel 123 protrudes or retracts from the treatment tool opening 3 via the suction opening 14 .

[0059] The water supply opening 4 is an opening that penetrates the tip surface 11s in the longitudinal direction A, and is an opening in which the water supply section 15 is disposed. The water supply opening 4 can have an appropriate size and shape corresponding to the size and shape of the water supply section 15.

[0060] The guide portion 5 has a groove shape recessed on the base end side A2, and is formed so as to be able to guide liquid or the like to the suction opening portion 14.

[0061] 3, the direction in which the liquid is ejected from the water supply unit 15 toward the objective optical system 12 is referred to as the water supply direction D1. The direction in which the liquid flows toward the suction opening 14 while being guided by the guide unit 5 is referred to as the flow direction D2.

[0062] The liquid flows from the upstream side to the downstream side in the flow direction D2 of the liquid flowing through the guide portion 5. In the flow direction D2, the side where the suction opening 14 is provided is also referred to as the downstream side in the flow direction D2, and the opposite side is also referred to as the upstream side in the flow direction D2.

[0063] The guide portion 5 is inclined toward the base end side A2 from the upstream side to the downstream side in the flow direction D2.

[0064] The guide unit 5 is provided on the opposite side of the water supply unit 15 across the objective optical system 12 in the water supply direction D1. The guide unit 5 does not need to be provided strictly on the opposite side of the water supply unit 15 across the objective optical system 12 in the water supply direction D1, but may be provided near the opposite side of the water supply unit 15.

[0065] The guide portion 5 has an arc shape centered on the field of view axis O1, and is shaped to follow the protrusion 1 in a plan view from the tip side A1. The flow direction D2 is a direction along the arc centered on the field of view axis O1. The guide portion 5 does not need to be strictly arc-shaped. Furthermore, the flow direction D2 does not need to be a direction along the arc strictly.

[0066] 3, the first illumination optical system 13a is provided on the opposite side of the water supply unit 15 across the objective optical system 12 in the water supply direction D1. The first illumination optical system 13a does not need to be provided strictly on the opposite side of the water supply unit 15 across the objective optical system 12 in the water supply direction D1, but may be provided near the opposite side of the water supply unit 15.

[0067] The guide unit 5 is provided adjacent to the first illumination optical system 13a and is arranged to be able to guide the liquid from the first illumination optical system 13a to the suction opening 14. In other words, the first illumination optical system 13a is provided upstream in the flow direction D2.

[0068] When liquid such as cleaning water is fed from the water feed unit 15 toward the objective optical system 12, the liquid is ejected from the water feed opening of the water feed unit 15 in a water feed direction D1.

[0069] The liquid ejected from the water supply section 15 in the water supply direction D1 cleans the objective optical system 12 and reaches the periphery of the guide section 5 and the first illumination optical system 13a, which are located on the opposite side of the objective optical system 12 from the water supply section 15.

[0070] The guide section 5 adjacent to the first illumination optical system 13a is concave on the proximal side A2, so that liquid that reaches the periphery of the first illumination optical system 13a is easily removed from the periphery of the first illumination optical system 13a by collecting on the guide section 5.

[0071] The side surface of the protrusion 1 is an inclined surface that slopes toward the base end side A2 as it moves away from the field of view axis O1. Therefore, the liquid remaining around the objective optical system 12 is collected at the guide part 5 via the inclined surface of the protrusion 1, and the liquid is removed from the periphery of the objective optical system 12. By collecting the liquid at the concave guide part 5, it is possible to prevent the liquid from being reflected on the objective optical system 12.

[0072] The guide unit 5 is inclined toward the base end side A2 in the flow direction D2 from the upstream side where the first illumination optical system 13a is provided to the downstream side where the suction opening 14 is provided. Therefore, the liquid collected in the guide unit 5 tends to flow in the flow direction D2.

[0073] The endoscopic imaging device 10 can collect water droplets remaining around the first illumination optical system 13a and the objective optical system 12 in the guide section 5. Furthermore, the water droplets collected in the guide section 5 tend to flow toward the suction opening 14. Furthermore, by performing suction through the suction opening 14, the remaining water droplets in the endoscope 100 can be efficiently sucked.

[0074] Water droplets remaining around the objective optical system 12 may flow through the objective optical system 12, the protrusion 1, and the treatment instrument opening 3 in this order, without passing through the guide section 5, and then be sucked through the suction opening 14.

[0075] An inclined portion 3a is formed on the edge of the treatment instrument opening 3. The inclined portion 3a is formed along the edge of the treatment instrument opening 3 and has a tapered shape that is inclined toward the base end side A2 from the distal end surface 11s to the center of the treatment instrument opening 3 or the suction opening 14.

[0076] Because the treatment instrument opening 3 has an inclined portion 3a, the liquid sucked into the suction opening 14 from the guide portion 5 or the tip surface 11s does not remain on the edge of the treatment instrument opening 3 but is smoothly sucked out of the suction opening 14.

[0077] The wall portion 6 is formed along the guide portion 5 and has a tapered shape that is inclined toward the base end side A2 from the distal end surface 11s to the guide portion 5. The wall portion 6 is provided on both sides of the guide portion 5, and has a first wall portion 6a and a second wall portion 6b, as shown in Figures 2 and 3 .

[0078] The first wall portion 6a is the wall portion 6 that is farthest from the field of view axis O1 among the wall portions 6 provided on both sides of the guide portion 5.

[0079] The second wall portion 6b is the wall portion 6 that is closer to the field of view axis O1 than the other wall portions 6 provided on both sides of the guide portion 5.

[0080] The second wall portion 6b allows the liquid flowing from the objective optical system 12 to the guide portion 5 via the protrusion 1 to flow smoothly into the guide portion 5 without remaining on the edge of the guide portion 5, so that water droplets at the tip of the endoscope 100 can be efficiently guided to the suction opening 14.

[0081] Furthermore, even if the force of the liquid ejected in the water supply direction D1 is strong, the liquid is blocked by the first wall portion 6a and therefore tends to remain in the guide portion 5. The first wall portion 6a can prevent the liquid from flowing radially outward of the guide portion 5 of the endoscopic imaging device 10.

[0082] Therefore, the liquid can be trapped as large clumps around the objective optical system 12, the first illumination optical system 13a and the guide section 5, and the clumped droplets can be sucked up efficiently by being sucked up through the suction opening 14.

[0083] The first wall 6a and the second wall 6b function as walls that prevent the liquid accumulated in the guide portion 5 from flowing in a direction different from the flow direction D2. Therefore, the liquid accumulated in the guide portion 5 flows smoothly in the flow direction D2 and is sucked through the suction opening 14.

[0084] The endoscopic imaging device 10 of this embodiment is an endoscopic imaging device provided at the tip of the insertion section 110 of the endoscope 100, and comprises an objective optical system 12, a water supply section 15 capable of injecting liquid toward the objective optical system 12, an illumination optical system 13 provided around the objective optical system 12, a suction opening 14 capable of sucking in the liquid ejected by the water supply section 15, and a guide section 5 provided on the opposite side of the objective optical system 12 from the water supply section 15 in the water supply direction D1, and configured to be able to guide the liquid to the suction opening 14.

[0085] In addition, the endoscopic tip cover 11 provided in the endoscopic imaging device 10 is an endoscopic tip cover provided at the tip of the insertion section 110 of the endoscope 100, and includes a protrusion 1 in which the objective optical system 12 can be placed, a water supply opening 4 in which a water supply section 15 capable of injecting liquid toward the objective optical system 12 can be placed, an illumination opening 2 in which an illumination optical system 13 can be placed, a treatment instrument opening 3 provided adjacent to the protrusion 1, and a guide section 5 provided on the opposite side of the water supply opening 4 across the protrusion 1 in the water supply direction D1, and formed so as to be able to guide liquid to the treatment instrument opening 3.

[0086] As a result, it is possible to provide an endoscopic imaging device 10, an endoscope 100, and an endoscopic tip cover 11 that can guide and hold remaining water droplets on the endoscope 100 outside the field of view of the objective optical system 12 so that the water droplets are not reflected within the field of view, and can also be efficiently sucked in.

[0087] While one embodiment of the present disclosure has been described above in detail with reference to the drawings, the specific configuration is not limited to this embodiment and includes design modifications within the scope of the present disclosure. Furthermore, the components shown in the above-described embodiment and the modified examples shown below can be configured in any suitable combination.

[0088] (Modification 1) In the above embodiment, the distal end surface 11s of the endoscope distal end cover 11 is a flat surface extending in a direction perpendicular to the longitudinal direction A, but the form of the distal end surface of the endoscope distal end cover is not limited to this.

[0089] The tip surface of the endoscope tip cover may have a sloped or concave shape or a stepped shape on the base end side A2 to prevent the outer periphery of the endoscope tip cover from obstructing the field of view of the objective optical system 12.

[0090] On the tip surface of the endoscope tip cover, the portion that may enter the field of view of the objective optical system 12 is moved to the base end side A2 and positioned outside the field of view, thereby improving the visibility of the objective optical system 12.

[0091] REFERENCE SIGNS LIST 100 Endoscope 110 Insertion section 10 Endoscope imaging device 11 Endoscope distal end cover 11s Distal end surface 1 Projection section 2 Illumination opening 3 Treatment tool opening 3a Inclined section 4 Water supply opening 5 Guide section 6 Wall section 12 Objective optical system 13 Illumination optical system 13a First illumination optical system 13b Second illumination optical system 14 Distal end opening (suction opening) 15 Water supply section O1 Field of view axis A Longitudinal direction A1 Distal end side A2 Base end side C Circumferential direction D1 Water supply direction D2 Flow direction

Claims

1. An endoscopic imaging device provided at the tip of an insertion portion of an endoscope, comprising: an objective optical system; a water supply unit capable of injecting liquid toward the objective optical system; an illumination optical system provided around the objective optical system; a suction opening capable of sucking in the liquid ejected by the water supply unit; and a guide unit provided on the opposite side of the objective optical system from the water supply unit in the direction in which the water supply unit ejects the liquid, the guide unit being capable of guiding the liquid to the suction opening.

2. The endoscopic imaging device according to claim 1, wherein the guide portion has a groove shape that is inclined from the upstream side to the downstream side in the flow direction of the liquid flowing through the guide portion toward the base end side in the longitudinal direction of the insertion portion.

3. An endoscopic imaging device as described in claim 1, further comprising a protrusion that protrudes from the distal end surface on which the illumination optical system is provided toward the distal end side in the longitudinal direction of the insertion section, and the objective optical system has a field of view axis extending in the longitudinal direction and a field of view greater than 180° and is provided on the protrusion.

4. An endoscopic imaging device according to claim 3, wherein the protrusion is in the shape of a hollow truncated cone centered on the axis of view, and the guide is in the shape of an arc centered on the axis of view.

5. The imaging device for endoscopes according to claim 4, further comprising a wall portion formed along the guide portion and inclined toward the base end in the longitudinal direction from the distal end surface to the guide portion.

6. The endoscopic imaging device according to claim 1, further comprising an inclined portion inclined from the distal end surface on which the illumination optical system is provided to the center of the suction opening toward the base end in the longitudinal direction of the insertion portion.

7. The endoscopic imaging device according to claim 1, wherein the illumination optical system is provided upstream in the flow direction of the liquid flowing through the guide section.

8. An endoscopic imaging device as described in claim 7, further comprising a second illumination optical system arranged at a position different from that of the first illumination optical system, and the suction opening is sandwiched between the first illumination optical system and the second illumination optical system in the circumferential direction of the field of view axis of the objective optical system.

9. The endoscopic imaging device according to claim 1, wherein the suction opening is disposed adjacent to the objective optical system.

10. An endoscope comprising an endoscopic imaging device according to any one of claims 1 to 9 at the tip of the insertion section.

11. An endoscope tip cover that is provided at the tip of an insertion part of an endoscope, comprising: a protrusion in which an objective optical system can be positioned; a water supply opening in which a water supply unit that can inject liquid toward the objective optical system can be positioned; an illumination opening in which an illumination optical system can be positioned; a treatment tool opening provided adjacent to the protrusion; and a guide section that is provided on the opposite side of the water supply opening across the protrusion in the direction in which the water supply unit injects the liquid, and is formed so as to be able to guide the liquid to the treatment tool opening.

12. The endoscope tip cover according to claim 11, wherein the illumination opening is provided upstream in the flow direction of the liquid flowing through the guide section.

Images