Medical spray device

Abstract

Provided is a medical spray device having a novel structure capable of stably spraying two liquids discharged from a tip part of a flow passage member toward a tip side while being atomized by injection gas and mixed.　In this medical spray device 12, a first liquid discharge hole 36 and a second liquid discharge hole 38 from which mutually different chemical liquids are discharged are formed so as to be opened to one of mountain-shaped inclined surfaces 28, 28 sandwiching, in the left-right width direction, a mountain ridge part 26 extending from a base end side to a tip side.

Description

Medical Nebulizer Device

[0001] The present invention relates to a medical spray device that sprays a mixture of multiple liquid substances into the body.

[0002] Conventionally, multiple types of liquids have been mixed and used in medical treatments. However, in cases where multiple types of liquids react with each other when mixed, it is not possible to mix the multiple types of liquids in advance.

[0003] Therefore, as disclosed in Japanese Patent No. 6911542 (Patent Document 1), a medical spray device has been proposed, such as a medical liquid injection tool for living bodies, in which two types of medicinal liquid are sprayed from the tip of a device inserted into the body and sprayed onto an affected area, etc., mixing the two types of medicinal liquid.

[0004] The biomedical liquid injection device of Patent Document 1 is designed to spray two types of medicinal liquids that are respectively ejected from two cylindrical portions protruding from the nozzle tip surface, and then atomize and mix the liquids with gas injected from a gas passage opening at the nozzle tip surface.

[0005] Patent No. 6911542

[0006] However, the inventors' investigations have revealed that in medical spray devices with a conventional structure such as that described in Patent Document 1, the two types of medicinal liquids sprayed in mist and mixed together react to gel, harden, or otherwise adhere to the vicinity of the medicinal liquid discharge port, which can easily stagnate or adhere and cause problems with stable discharge of the medicinal liquid. In particular, in the medical liquid injection device for living organisms described in Patent Document 1, the tubular portion for discharging the medicinal liquid protrudes from the nozzle tip, so that the sprayed mixed medicinal liquid is likely to be drawn into the outer periphery of the tubular portion and adhere thereto due to vortexes, entrainment, turbulence, etc. of air generated at the nozzle tip.

[0007] Furthermore, it was found that medical spray devices with conventional structures do not have sufficient mixing performance when spraying two types of medicinal liquids in mist form. For example, depending on the medicinal liquid being sprayed, the liquids may not mix well, resulting in insufficient mixing, and the mixed medicinal liquid may not be able to perform to its full potential.

[0008] The present invention aims to solve the newly discovered problems described above, and one of the problems to be solved is to provide a novel medical spray device that makes it possible to stably mix and spray multiple liquid substances.

[0009] The following describes preferred embodiments for understanding the present invention, but the embodiments described below are merely examples and may be appropriately combined with one another. Multiple components described in each embodiment may be recognized and employed independently to the greatest extent possible, and may also be appropriately combined with any of the components described in other embodiments. Accordingly, the present invention is not limited to the embodiments described below, and various other embodiments may be realized.

[0010] A first aspect is as follows: A medical spray device in which a medicinal liquid is discharged from a liquid discharge hole at a tip portion of a flow path member having a liquid discharge hole and a gas jet hole, and the medicinal liquid discharged from the liquid discharge hole is sprayed in the form of a mist by gas jetted from the gas jet hole, the liquid discharge holes having a first liquid discharge hole and a second liquid discharge hole through which different medicinal liquids are discharged, the tip surface of the flow path member is formed with a liquid discharge surface that protrudes while sloping outwardly toward the tip of the flow path member, the liquid discharge surface being a mountain-shaped inclined surface having a ridge portion extending from the base end side toward the tip side of the flow path member, the first liquid discharge hole opening on one side of the mountain-shaped inclined surface, and the second liquid discharge hole opening on the other side.

[0011] According to this aspect, the opening of the first liquid discharge hole and the opening of the second liquid discharge hole are provided on opposite inclined surfaces of a mountain-shaped inclined surface that constitutes the liquid discharge surface, sandwiching a ridge portion therebetween. Therefore, compared to when the chemical liquid is discharged from a tubular portion protruding from the nozzle tip surface as described in Prior Art Document 1, stagnation of the chemical liquid around the discharge port due to turbulence, etc. is suppressed, and the chemical liquid is atomized by the gas and smoothly guided toward the tip side. Furthermore, a ridge portion extending from the base end toward the tip side is provided between the openings of the first liquid discharge hole and the second liquid discharge hole. This prevents the chemical liquids discharged from the respective openings and atomized by the gas from immediately mixing near the openings and actively and continuously guides the chemical liquids toward the tip side along the ridge portion. This effectively prevents adhesion of gelled chemical liquid near the chemical liquid discharge port and improves and stabilizes the mixing of the two types of chemical liquids.

[0012] A second aspect is the medical spray device according to the first aspect, as follows: The opening of the gas injection hole is located closer to the base end of the flow path member than the openings of the first liquid discharge hole and the second liquid discharge hole, and the gas injection hole opens at an angle in the direction of inclination of the liquid discharge surface.

[0013] According to this aspect, the gas ejected from the gas injection hole is easily guided along the liquid ejection surface where the liquid chemical outlet opens, and a stable gas flow is formed along the liquid ejection surface, making it possible to spray and mix the liquid chemical ejected from the liquid chemical outlet more smoothly and stably in a mist without stagnation.

[0014] A third aspect is a medical spray device according to the first or second aspect, as follows: The gas injection hole has a first gas injection hole and a second gas injection hole, and in a front view of the tip surface of the flow path member, the centers of the openings of the first gas injection hole and the second gas injection hole are both located outside the centers of the openings of the first liquid discharge hole and the second liquid discharge hole in the direction of separation from each other.

[0015] According to this aspect, it is easy to suppress outward diffusion (to both outward sides in the direction of separation between the first liquid discharge hole and the second liquid discharge hole) of the liquid chemical that is discharged from the openings of the first liquid discharge hole and the second liquid discharge hole and sprayed in mist form by the gas ejected from the openings of the first gas injection hole and the second gas injection hole, and as a result, it is possible to efficiently mix and spray the two types of liquid chemical that are discharged from the openings of the first liquid discharge hole and the second liquid discharge hole.

[0016] A fourth aspect is a medical spray device according to any one of the first to third aspects, as follows: The liquid ejection surface is provided in a partial region on the tip surface of the flow path member, and a gas ejection surface is formed in a region different from the liquid ejection surface, the gas ejection surface is inclined toward the liquid ejection surface relative to a plane perpendicular to the central axis of the flow path member, and the gas ejection holes open into the gas ejection surface.

[0017] According to this aspect, the gas injected from the gas injection hole is prevented from stagnating near the gas injection surface, and is guided smoothly and stably toward the opening of the liquid discharge hole, thereby making it possible to spray the medicinal liquid, which is atomized by the gas, more stably.

[0018] A fifth aspect is a medical spray device according to any one of the first to fourth aspects, as follows: The gas injection hole has a first gas injection hole and a second gas injection hole, the liquid ejection surface is provided in a partial region of the tip end face of the flow path member, the gas injection surface is formed in a region different from the liquid ejection surface, and the gas injection surface is a valley-shaped inclined surface, and when viewed from the front of the tip end face of the flow path member, the first gas injection hole opens on one surface sandwiching the valley bottom of the valley-shaped inclined surface, and the second gas injection hole opens on the other surface.

[0019] According to this aspect, the gas injection surfaces into which the first gas injection holes and the second gas injection holes open are formed as valley-shaped inclined surfaces that are inclined inward relative to each other, which suppresses diffusion of the gas injected from the first gas injection holes and the second gas injection holes, particularly outward diffusion in the direction of separation between the first gas injection holes and the second gas injection holes. This suppresses outward diffusion of the chemical liquid atomized by the gas, making it possible to more efficiently mix and spray the two chemical liquids.

[0020] A sixth aspect is the medical spray device according to the fifth aspect, wherein the angle of intersection between the mountain-shaped inclined surface and the valley-shaped inclined surface is 90±30 degrees on at least one of a plane that includes the center of the opening of the first liquid discharge hole and the center of the opening of the first gas jet hole and is perpendicular to the liquid discharge surface on which the first liquid discharge hole opens, and a plane that includes the center of the opening of the second liquid discharge hole and the center of the opening of the second gas jet hole and is perpendicular to the liquid discharge surface on which the second liquid discharge hole opens.

[0021] According to this aspect, the inclination angle of the valley-shaped inclined surface that constitutes the gas ejection surface is set corresponding to the inclination angle of the mountain-shaped inclined surface that constitutes the liquid ejection surface, which makes it possible to more appropriately set the effect of suppressing the diffusion of the gas ejected from the valley-shaped inclined surface, the effect of mixing the chemical liquid ejected from the mountain-shaped inclined surface, etc. Furthermore, in this aspect, by adjusting the intersection angle (relative inclination angle) between the mountain-shaped inclined surface and the valley-shaped inclined surface within the above-mentioned range, it becomes easy to appropriately adjust and set the degree of mixing of the two types of sprayed chemical liquid, taking into account, for example, the type of chemical liquid and the ejection amount.

[0022] A seventh aspect is the medical spray device according to the fifth or sixth aspect, as follows: A medical spray device wherein an angle of intersection between the valley-shaped inclined surface and at least one of a plane that includes the center of the opening of the first liquid discharge hole and the center of the opening of the first gas injection hole and is perpendicular to the liquid discharge surface on which the first liquid discharge hole opens, and a plane that includes the center of the opening of the second liquid discharge hole and the center of the opening of the second gas injection hole and is perpendicular to the liquid discharge surface on which the second liquid discharge hole opens, is 90±30 degrees.

[0023] According to this aspect, in a plan view of the liquid discharge surface as illustrated in Figure 4 of the embodiment described below, the inclination angle of the valley-shaped inclined surface can be more appropriately set in consideration of the relative positional relationship between the openings of the liquid discharge holes and the gas injection holes, and the chemical liquid discharged from the mountain-shaped inclined surface can be more effectively atomized and mixed by the gas injected from the valley-shaped inclined surface while suppressing diffusion. Note that, in this aspect as well, by adjusting the inclination angle of the mountain-shaped inclined surface specified in this aspect within the above-mentioned range, it is easy to appropriately adjust and set the degree of mixing of the chemical liquid, etc.

[0024] An eighth aspect is a medical spray device according to any one of the first to seventh aspects, as follows: The gas injection holes include a first gas injection hole having an opening facing the opening of the first liquid discharge hole and a second gas injection hole having an opening facing the opening of the second liquid discharge hole, and an extension line of the central axis of the opening side of the first gas injection hole and an extension line of the central axis of the opening side of the second gas injection hole are inclined in directions approaching each other.

[0025] According to this aspect, the chemical liquid discharged from the first chemical liquid discharge port and sprayed into a mist by the gas ejected from the first gas injection hole and the chemical liquid discharged from the second chemical liquid discharge port and sprayed into a mist by the gas ejected from the second gas injection hole can be mixed more actively or efficiently. Furthermore, by adjusting the relative inclination angle of the extension line of the central axis of the opening side of the first gas injection hole and the extension line of the central axis of the opening side of the second gas injection hole in the direction of approach, it becomes easy to appropriately adjust and set the degree of mixing of the two types of sprayed chemical liquids.

[0026] A ninth aspect is a medical spray device according to any one of the first to eighth aspects, as follows: The liquid discharge surface is formed by a tip protrusion that is provided on the tip surface of the flow path member so as to partially protrude toward the tip, and the tip edge of the tip protrusion is a cut end surface that extends in the thickness direction of the tip protrusion between the outer circumferential surface of the flow path member and the liquid discharge surface.

[0027] According to this aspect, even if the liquid medicine or its mixture flows along the surface of the liquid discharge surface that is inclined from the base end side to the tip end side of the flow path member toward the outer periphery, it is possible to prevent the liquid medicine from collecting in one place at the tip edge of the tip protrusion, thereby reducing or avoiding problems such as the liquid medicine pooling at the tip edge of the tip protrusion and gelling, causing it to droop.

[0028] A tenth aspect is a medical spray device according to any one of the first to eighth aspects, as follows: The liquid discharge surface is formed by a distal protrusion provided on the distal end surface of the flow path member so as to partially protrude toward the distal end, and the distal end portion of the distal protrusion has an outer peripheral inclined surface provided on the outer peripheral surface thereof, the outer peripheral surface being inclined in a direction approaching the liquid discharge surface toward the distal end of the flow path member.

[0029] According to this aspect, by providing an outer peripheral inclined surface at the tip portion of the tip protrusion, it is possible to suppress the gas flow along the surface of the inclined liquid discharge surface from being drawn in from the tip edge of the liquid discharge surface to the outer peripheral surface side. Therefore, even if the chemical solution or its mixture flows along the surface of the liquid discharge surface, it is likely to be scattered forward from the tip edge of the liquid discharge surface, and it is possible to reduce or avoid problems such as the chemical solution accumulating at the tip edge of the tip protrusion and gelling, causing it to droop.

[0030] An eleventh aspect is a medical spray device according to any one of the first to tenth aspects, as follows: The liquid discharge surface is formed by a tip protrusion provided on the tip surface of the flow path member so as to partially protrude toward the tip side, and the tip protrusion is provided with a cavity that opens to the outer peripheral surface behind the liquid discharge surface.

[0031] According to this aspect, as can be seen from the exemplary aspects of Figures 10 to 11 of the embodiment described later, adhesion of the mixed chemical liquid, gelled substance, etc., which flows from the tip of the inclined liquid ejection surface to the back surface and is drawn in, to the outer peripheral surface is reduced or prevented, and it becomes easy to blow it away with ejected air, for example, before it gels and hardens completely.

[0032] A twelfth aspect is a medical spray device according to any one of the first to eleventh aspects, as follows: A visor-shaped portion extending from an outer peripheral edge toward the tip side is provided on the tip surface of the flow path member, the visor-shaped portion covers the entire opening of the gas injection hole when viewed from the side of the flow path member, and at least half of the openings of the first liquid discharge hole and the second liquid discharge hole are covered by the visor-shaped portion.

[0033] According to this aspect, the openings of the gas injection holes and the liquid discharge holes are surrounded by the eave-shaped portion extending from the outer periphery of the flow path member toward the tip, thereby more effectively suppressing unwanted spreading of the injected gas and the discharged and sprayed mist of the liquid medicine toward the outer periphery, thereby enabling the liquid medicine discharged from the openings of the first and second liquid discharge holes and sprayed into a mist by the gas to be mixed more stably and to be sprayed more stably toward the target site.

[0034] In the medical spray device according to the present invention, the first and second liquid discharge holes are provided on opposite sides of the ridge of the mountain-shaped inclined surface that constitutes the liquid discharge surface, so that the liquid medicines discharged from the respective holes and atomized by the gas are guided toward the tip along the liquid discharge surface while being prevented from immediately mixing near the holes. As a result, adhesion of gelled liquid medicines near the openings of the first and second liquid discharge holes is prevented, making it possible to spray the liquid medicines discharged from the first and second liquid discharge holes in a stable mixed mist at the tip of the mountain-shaped inclined surface, and improving and stabilizing the mixing of the two types of liquid medicine.

[0035] 1 is a side view of the medical spray device shown in FIG. 1, with liquid discharge holes and gas injection holes indicated by hidden lines (broken lines); sectional view of the medical spray device shown in FIG. 1, corresponding to the IV-IV section of FIG. 3; lateral view of the medical spray device shown in FIG. 1, corresponding to the V-V section of FIG. 2; sectional view of the medical spray device shown in FIG. 1, cut along a plane perpendicular to the mountain-shaped inclined surface; sectional view of the medical spray device shown in FIG. 1, cut along a plane parallel to the mountain-shaped inclined surface; sectional view corresponding to FIG. 4, showing the tip portion of a medical spray device according to another embodiment of the present invention; longitudinal section corresponding to FIG. 5, showing the tip portion of a medical spray device according to another embodiment of the present invention;

[0036] In order to clarify the present invention more specifically, embodiments of the present invention will be described in detail below with reference to the drawings.

[0037] 1 to 5 show the tip portion, which is a key part, of a medical spray device 12 according to a first embodiment of the present invention. That is, the medical spray device 12 according to the present invention is provided with a tubular flow path member in which liquid discharge holes and gas injection holes are formed extending in the length direction, and the tip portion of this flow path member has the structure shown in FIGS.

[0038] Such a medical spray device 12 is inserted into the patient's body from the tip side of the flow path member, guides a liquid supplied from outside the body into the body, and sprays it in the form of a mist from the tip. In the following description, as a general rule, the up-down direction refers to the up-down direction in Figures 2, 3, and 5, the front-rear direction refers to the left-right direction in Figures 3 and 5, which is the longitudinal or axial direction of the medical spray device 12, and the left-right direction refers to the left-right direction in Figure 2. Furthermore, as a general rule, the tip side refers to the left side in Figures 3 and 5, which is the patient side (distal side) when in use, and the base side refers to the right side in Figures 3 and 5, which is the practitioner side (proximal side) when in use.

[0039] Furthermore, the tip portion of the flow path member shown as the medical spray device 12 in Figures 1 to 5 may be integrally formed on the tip side of the tubular flow path member, but in this embodiment, as shown in Figure 3, it is formed as a separate member from the flow path tube 14 in which the liquid discharge holes and gas injection holes are formed extending in the length direction, and has an attachment structure in which it is fixed to the tip side opening of the flow path tube 14.

[0040] More specifically, the medical spray device 12 of this embodiment is a block-shaped device with a linearly extending cylindrical outer surface. The material is not limited, and can be selected from various materials such as metals and synthetic resins, taking into consideration factors such as not damaging body tissues that come into contact with it and corrosion resistance to the medicinal solution used.

[0041] A circumferentially extending step 16 is formed in the middle portion of the outer surface of the medical spray device 12 in the longitudinal direction, and the outer surface on the base end side is an engagement surface 18 with a smaller diameter than the tip end side, while the outer surface on the tip end side is an exposed surface 20 with a larger diameter than the base end side.

[0042] The cylindrical opening at the tip end of the flow path tube 14 (see FIG. 3) is fitted onto and fixed to the fitting surface 18, thereby connecting to the flow path tube 14. The exposed surface 20 protrudes from the tip end opening of the flow path tube 14 and is exposed when connected to the flow path tube 14.

[0043] The base end surface in the axial direction of the medical spray device 12 is a flat circular shape that extends in the direction perpendicular to the axis, but the tip surface has a complex shape with irregularities and a concave center.

[0044] A lower protrusion 22 is formed in a lower region of the distal end surface as a distal protrusion that protrudes toward the distal end like a lower jaw. An upper surface 24 of the lower protrusion 22 is set with an axial inclination angle that extends downward from the base end toward the distal end (downward in FIGS. 2, 3, and 5). Furthermore, a linear ridgeline 26 is set in the approximate center of the upper surface 24 in the left-right width direction as a mountain ridge extending from the base end of the lower protrusion 22 toward the distal end. As a result, the upper surface 24 of the lower protrusion 22 has mountain-shaped inclined surfaces 28, 28 on both left and right width sides of the ridgeline 26, each of which has a widthwise inclination angle that extends downward as it extends outward in the left-right width direction.

[0045] The inclination angle α (see FIG. 5) in the axial direction of the upper surface 24 of the lower protrusion 22 is not limited, but is preferably set within a range of 10 to 60 degrees, for example, and more preferably within a range of 20 to 50 degrees. The inclination angle β (see FIG. 2) in the left-right width direction of the mountain-shaped inclined surfaces 28, 28 is also not limited, but is preferably set within a range of 5 to 45 degrees, for example, and more preferably within a range of 10 to 35 degrees.

[0046] 4, the left and right edges of the distal end of the lower protrusion 22 are tapered so that the width gradually decreases toward the distal end (although the present invention is not limited to this tapered shape). The tapered tip (the distal end edge on the left in FIG. 4) forms a cut end surface 30 as if cut along a cross section in the thickness direction.

[0047] In particular, in this embodiment, the cut end surface 30 extends downward so as to be approximately perpendicular to the upper surface 24 of the lower protrusion 22 (see Figure 5), but the inclination angle γ with respect to the upper surface 24 is not limited and is preferably set within the range of 30 to 150 degrees, for example, and more preferably within the range of 60 to 120 degrees.

[0048] 4, the cut end surface 30 has a shape in plan view that resembles a fan-shaped cut-off tip of the lower protrusion 22, widening toward the tip at a predetermined angle θ in the left-right width direction, and has a tip edge shape that gradually indents toward the base end as it moves from both left-right width ends toward the center in the left-right width direction where the ridge line 26 is located. Note that the angle θ (the central angle of the fan-shaped tip of the lower protrusion 22) is not limited, but is preferably set within the range of an obtuse angle (90°<θ<180°), and more preferably set so that 120°<θ<170°.

[0049] Furthermore, in this embodiment, an outer peripheral inclined surface 32 that gradually inclines inward as it approaches the tip end is formed on the outer peripheral surface (exposed surface 20) of the tip portion of the lower protrusion 22. The inclination angle δ (see FIG. 5) of the outer peripheral inclined surface 32 is not limited, but is preferably set within a range of 2 to 30 degrees, for example, and more preferably within a range of 10 to 20 degrees.

[0050] A first liquid discharge hole 36 and a second liquid discharge hole 38 that guide the chemical liquid supplied through the flow path tube 14 are opened on the upper surface 24 of the lower protrusion 22, and the upper surface 24 forms the liquid discharge surface.

[0051] That is, the medical spray device 12 has a first liquid discharge hole 36 and a second liquid discharge hole 38 formed in the lower portion thereof, which are parallel to and independent of each other and extend axially from the base end toward the tip end. The specific shapes of the first liquid discharge hole 36 and the second liquid discharge hole 38 are not limited in any way, and various cross-sectional shapes such as polygonal or elliptical shapes can be adopted. It is also possible to adopt a shape in which the cross-sectional shape or cross-sectional area varies along the length of the hole. For example, a liquid discharge hole having a larger cross-sectional area at the tip end than at the base end can be adopted. However, in the illustrated example of this embodiment, the first liquid discharge hole 36 and the second liquid discharge hole 38 both have a circular cross-sectional shape and extend straight in the axial direction. Furthermore, a radial step is provided on the inner peripheral surface of the first liquid discharge hole 36 and the second liquid discharge hole 38 in the longitudinal intermediate portion of the medical spray device 12 (near the step 16 formed on the outer peripheral surface), making the diameter slightly smaller at the tip end than at the base end. (As mentioned above, the specific shape of the liquid discharge holes 36, 38 is not limited, and for example, in this embodiment, the base end side is made larger in diameter than the tip end side in anticipation of fitting a medicinal liquid tube inside the liquid discharge holes 36, 38, but if, for example, the liquid discharge holes 36, 38 are made to protrude cylindrically on the base end side and a medicinal liquid tube is to be fitted thereon, it is preferable to make the base end side have a smaller inner diameter than the tip end side, and the difference in diameter between the base end side and the tip end side in the length direction can be selected appropriately depending on the connection form of the medicinal liquid tube, etc.) The same applies to the structure of the connecting portion of the flow path tube 14 to the chair 12; for example, in this embodiment, the flow path tube 14 is intended to be connected by external fitting, and the base end side of the medical spray device 12 has an outer circumferential surface with a smaller diameter than the tip end side; however, if the medical spray device 12 is to be extended cylindrically toward the base end and the flow path tube 14 is to be connected by internal fitting, the outer diameter of the medical spray device 12 may be constant over its entire length, or the base end side may be made larger in diameter than the tip end side.

[0052] The first liquid discharge hole 36 and the second liquid discharge hole 38 are opened on one of the mountain-shaped inclined surfaces 28, 28 located on both the left and right sides of the ridge line 26 on the upper surface 24 of the lower protruding portion 22. The specific opening positions of the first liquid discharge hole 36 and the second liquid discharge hole 38 on the mountain-shaped inclined surfaces 28, 28 are not limited, and for example, they may be opened in positions that are asymmetrical to each other on both the left and right sides of the ridge line 26. However, in this embodiment, as can be seen from Figures 1 and 2, the first liquid discharge hole 36 and the second liquid discharge hole 38 are opened in approximately the center of each of the mountain-shaped inclined surfaces 28, 28, so as to be symmetrical to each other on either side of the ridge line 26.

[0053] As described above, the first liquid discharge hole 36 and the second liquid discharge hole 38 in the illustrated example have a substantially circular cross section in the axis-perpendicular direction, but the mountain-shaped inclined surfaces 28 on which the opening ends 40 are located are not perpendicular to the central axes of the first liquid discharge hole 36 and the second liquid discharge hole 38 but are inclined, so that the opening ends 40 are not truly circular but rather elliptical or oblong. That is, the inclined surfaces of the mountain-shaped inclined surfaces 28 are composite inclined surfaces with an inclination angle α in the axial direction of the top surface 24 and an inclination angle β in the left-right width direction. Therefore, the opening ends 40 of the first liquid discharge hole 36 and the second liquid discharge hole 38 provided on this composite inclined surface are each formed on the composite inclined surface as a substantially ellipse having a minor axis 42 in the maximum inclination direction of the composite inclined surface and a major axis 44 in the minimum inclination direction (see FIG. 4 ).

[0054] 4 , which shows the upper surface 24, which is the liquid ejection surface, as a projection onto a horizontal plane parallel to the device central axis or as a plan view perpendicular to the device central axis when viewed from above downward, the maximum inclination direction line extending through the centers of the opening ends 40 of the first liquid ejection hole 36 and the second liquid ejection hole 38 is the minor axis 42 of the opening ends 40, and the maximum inclination perpendicular line is the major axis 44 of the opening ends 40. In this embodiment, since the opening ends 40 of the first liquid ejection hole 36 and the second liquid ejection hole 38 are provided symmetrically on the left and right, the extension lines of the major axes 44, which are the two maximum inclination perpendicular lines, intersect with each other on the extension line of the ridge line 26 at position P, which is off the upper surface 24 of the lower protrusion 22 toward the tip, but the present invention is not limited to this.

[0055] On the other hand, it is desirable to provide an upper vertical wall portion 48 that extends upward from the base end edge of the lower protrusion 22 in the upper region of the axial tip surface of the medical spray device 12. As will be described later, this upper vertical wall portion 48 is provided with at least one gas injection hole (56, 58) located on each of the left and right sides.

[0056] The tip surface of the upper vertical wall portion 48 may be, for example, a surface that rises up and down approximately perpendicular to a horizontal plane parallel to the central axis of the device, or a surface that is slightly inclined backward, but in this embodiment, as shown in Figure 5, it is a forward inclined surface 50 that gradually inclines forward in the axial direction from the lower end upward.

[0057] Furthermore, the front inclined surface 50 may be a single flat surface extending across the entire width on both sides, or a mountain-like surface with a central portion protruding forward. However, in this embodiment, as shown in Fig. 4, the front inclined surface 50 is also inclined in the width direction, with a concave shape that slopes from the center in the width direction toward the tip on both sides of the width direction. That is, the front inclined surface 50 has a valley line 52 extending vertically through the center in the width direction, and has valley-shaped inclined surfaces 54, 54 on both sides that widen forward in the width direction from the valley line 52. In this embodiment, the valley line 52 between the valley-shaped inclined surfaces 54, 54 is located in the center in the width direction, extends linearly in the vertical direction, and is connected to the ridge line 26 of the lower protrusion 22, as shown in Fig. 2, but the relative positional relationship and continuity between the valley line 52 and the ridge line 26 are not limited. For example, the valley line 52 and the ridge line 26 do not need to be connected to each other, and may be separated from each other or may be set at positions that are relatively offset in the left-right width direction.

[0058] The specific design values ​​of the forward inclined surface 50 formed by such valley-shaped inclined surfaces 54, 54, such as the size of each surface and the inclination angle of each surface, are not particularly limited and can be adjusted and set appropriately taking into consideration, for example, the type of chemical solution used, as well as the flow rate of the chemical solution and gas, etc.

[0059] Specifically, for example, the relative inclination angle (intersection angle) μ of the upper surface 24 of the lower protrusion 22 with respect to the ridge line 26 in the longitudinal cross section including the device central axis shown in Figure 5 is not particularly limited and can be adjusted and set taking into consideration the type of chemical liquid, as described above. However, considering the efficiency and stability of atomization and mixing of the chemical liquid by gas, it is desirable that the intersection angle between the mountain-shaped inclined surface 28 and the valley-shaped inclined surface 54 is 90±30 degrees on at least one of the following planes: a plane that includes the centers of the openings of the first liquid discharge holes 36 and the first gas injection holes 56 and is perpendicular to one mountain-shaped inclined surface 28, which is the first liquid discharge surface; and a plane that includes the centers of the openings of the second liquid discharge holes 38 and the second gas injection holes 58 and is perpendicular to the other mountain-shaped inclined surface 28, which is the second liquid discharge surface. The plane perpendicular to the first liquid discharge surface (one of the convex slopes 28) and the plane perpendicular to the second liquid discharge surface (the other convex slope 28) can be understood as a plane that includes the major axis 44 shown in Fig. 4 and is perpendicular to the convex slope 28. Specifically, Fig. 6 shows a cross-sectional view of the medical spray device 12 cut along a plane that includes the major axis 44 of the opening end 40 of the first liquid discharge hole 36 and is perpendicular to the convex slope 28. Therefore, in Fig. 6, the intersection angle a between the convex slope 28 and the concave slope 54 is the intersection angle described above, and it is preferable that this intersection angle be 90±30 degrees, and more preferably 90±10 degrees.

[0060] Furthermore, the intersection angle (central angle) φ of the left and right valley-shaped inclined surfaces 54, 54 sandwiching the valley line 52 is not limited either, and for example, as described above, it is possible to set φ = 180° so that the entire forward inclined surface (gas injection surface) 50 extending to the left and right is a flat surface, but it can be set appropriately taking into consideration, for example, the relative positional relationship between the liquid discharge holes 36, 38 and the gas injection holes 56, 58. However, when considering the efficiency and stability of atomization and mixing of the chemical solution by the gas, it is preferable to set the intersection angle φ of the left and right valley-shaped inclined surfaces 54, 54 so as to satisfy, for example, the following condition. That is, in a plan view of the upper surface 24, which is the liquid ejection surface, viewed from above (see Figure 4), it is desirable that the intersection angle between a plane perpendicular to the first liquid ejection surface (one of the mountain-shaped inclined surfaces 28) that includes the centers of the openings of the first liquid ejection holes 36 and the first gas injection holes 56 and a plane perpendicular to the second liquid ejection surface (the other mountain-shaped inclined surface 28) that includes the centers of the openings of the second liquid ejection holes 38 and the second gas injection holes 58 and each valley-shaped inclined surface 54 on at least one of the planes be 90±30 degrees, and more preferably the intersection angle be 90±10 degrees. The plane perpendicular to the first liquid discharge surface (one of the convex slopes 28) and the plane perpendicular to the second liquid discharge surface (the other convex slope 28) can both be understood as a plane that includes the major axis 44 of the opening end 40 of the liquid discharge hole and is perpendicular to the convex slope 28. The intersection angle between such a plane and the valley-shaped slope 54 can be roughly understood as a dihedral angle indicated as ρ in FIG. 4, which shows a plan view. More precisely, in FIG. 7, which shows a cross section cut by a plane parallel to the convex slope 28, the intersection angle is the dihedral angle b between the valley-shaped slope 54 and a plane that is perpendicular to the convex slope 28 and that includes the center of the opening of the first liquid discharge hole 36 and the center of the opening of the first gas injection hole 56. Therefore, it is preferable that the dihedral angle b be 90±30 degrees, and more desirably 90±10 degrees.

[0061] A first gas injection hole 56 and a second gas injection hole 58 that guide the gas supplied through the flow path tube 14 are opened in the forward inclined surface 50 of the upper vertical wall portion 48, and the gas injection surface is formed by this forward inclined surface 50.

[0062] That is, a gas supply channel 60 is formed in the upper portion of the medical spray device 12, extending axially from the base end to the tip end. The gas supply channel 60 is not limited in any way in terms of its specific cross-sectional shape, size, longitudinal flow path configuration, position, number, etc. However, in this embodiment, a single gas supply channel 60 is formed straight and has a generally crescent-shaped cross section extending from the base end to the middle portion in the axial direction, and the wall portion on the tip side of this gas supply channel 60 is formed by the upper vertical wall portion 48. Furthermore, the upper vertical wall portion 48 is formed with a first gas injection hole 56 and a second gas injection hole 58, each opening into valley-shaped inclined surfaces 54, 54 located on both left and right sides of the valley line 52 on the front inclined surface 50. The specific shape, size, position, number, etc. of these gas injection holes are also not limited. For example, the opening of the gas injection hole may be located at the same position as the opening of the liquid discharge hole in the axial direction of the spray device, or may be located closer to the tip end. Furthermore, for example, the opening of the gas injection hole may be constituted by an injection nozzle protruding from the gas injection surface.

[0063] The specific opening positions of the first gas injection holes 56 and the second gas injection holes 58 in the valley-shaped inclined surfaces 54, 54 are not limited, but in this embodiment, as can be seen from FIGS. 1 and 2, the opening ends 62, 62 of the first gas injection holes 56 and the second gas injection holes 58 are both set at positions closer to the lower ends of the valley-shaped inclined surfaces 54, 54 in the vertical direction than to the upper ends thereof, and are set to open close to the left and right mountain-shaped inclined surfaces 28, 28 at which the first and second liquid discharge holes 36, 38 open.

[0064] In this embodiment, the penetration direction of the first gas injection holes 56 and the second gas injection holes 58 in the upper vertical wall portion 48 is inclined downward from the base end side to the tip end side. As a result, the central axes of the first gas injection holes 56 and the second gas injection holes 58 are set to extend substantially along the surfaces of the left and right mountain-shaped inclined faces 28, 28 on which the first and second liquid discharge holes 36, 38 open. Preferably, the central axes of the openings of the first gas injection holes 56 and the second gas injection holes 58 are set to be substantially perpendicular to the front inclined face 50 of the upper vertical wall portion 48.

[0065] Furthermore, in this embodiment, as shown in Fig. 2, the separation distance La between the centers of the opening ends 62, 62 of the first gas injection holes 56 and the second gas injection holes 58 is greater than the separation distance Lb between the centers of the opening ends 40, 40 of the first liquid discharge holes 36 and the second liquid discharge holes 38. As a result, in the left-right width direction of the medical spray device 12, the opening ends 40, 40 of the first liquid discharge holes 36 and the second liquid discharge holes 38 are positioned closer to the center in the width direction than the opening ends 62, 62 of the first gas injection holes 56 and the second gas injection holes 58. In other words, the opening ends 62, 62 of the first gas injection holes 56 and the second gas injection holes 58 extend outward on both sides in the left-right width direction beyond the opening ends 40, 40 of the first liquid discharge holes 36 and the second liquid discharge holes 38.

[0066] Furthermore, the distal end surface of the medical spray device 12 is provided with a visor-shaped portion 66 extending distally from the outer peripheral edge. In this embodiment, the visor-shaped portions 66 extend circumferentially from both circumferential edges of the lower protrusion 22 on the base end side where the outer peripheral inclined surface 32 is not provided, and are connected to each other at the upper end, thereby protruding axially in a circumferentially extending arc shape from approximately the upper portion of the medical spray device 12. The circumferential length of the visor-shaped portion 66 is not limited and can be selected as appropriate, but is preferably a continuous arc shape extending approximately 1 / 4 to 1 / 2 of the circumference. The axial protrusion length of the visor-shaped portion 66 also varies circumferentially, with the axial tip of the visor-shaped portion 66 protruding significantly at the top and inclining downward toward the base end on both circumferential sides.

[0067] 2, the eave-shaped portion 66 is provided to sandwich and cover the opening ends 40, 40 of the first liquid discharge holes 36 and the second liquid discharge holes 38 and the opening ends 62, 62 of the first gas injection holes 56 and the second gas injection holes 58 in the left-right width direction. Furthermore, in a side view of the medical spray device 12 shown in FIG. 3, the eave-shaped portion 66 covers the entire front inclined surface 50 of the upper vertical wall portion 48, covers the upper surface 24 of the lower protrusion 22 except for the tip portion, and covers more than half (in this embodiment, the entire) of the opening ends 40, 40 of the first liquid discharge holes 36 and the second liquid discharge holes 38 formed on the upper surface 24. In this embodiment, the tip portion of the liquid discharge surface (the upper surface 24 of the lower protrusion 22) consisting of a mountain-shaped inclined surface protrudes from the eave-shaped portion 66 toward the tip.

[0068] The medical spray device 12 constructed as described above is connected to the tip opening of the flow path tube 14, thereby connecting the first liquid discharge hole 36 and the second liquid discharge hole 38 of the medical spray device 12 to the gas supply path 60, respectively, with three independent flow paths formed inside the flow path tube 14 and extending independently of one another in the longitudinal direction. That is, the flow path tube 14 has a first liquid flow path and a second liquid flow path that are independent of one another formed in a lower portion corresponding to the first liquid discharge hole 36 and the second liquid discharge hole 38, and the first liquid flow path is connected and communicated with the first liquid discharge hole 36, and the second liquid flow path is connected and communicated with the second liquid discharge hole 38. In addition, the flow path tube 14 has a gas flow path formed in an upper portion corresponding to the gas supply path 60, and this gas flow path is connected and communicated with the gas supply path 60.

[0069] As a result, a first chemical liquid supplied from the outside through the first liquid flow path of the flow path tube 14 is guided to the first liquid discharge hole 36, and a second chemical liquid supplied from the outside through the second liquid flow path of the flow path tube 14 is guided to the second liquid discharge hole 38, while a gas supplied from the outside through the gas flow path of the flow path tube 14 is guided to the first gas injection hole 56 and the second gas injection hole 58 via the gas supply path 60. The first chemical liquid discharged from the first liquid injection hole 36 and the second chemical liquid discharged from the second liquid injection hole 38 are sprayed independently in mist form by the gas injected from the first gas injection hole 56 and the gas injected from the second gas injection hole 58, respectively, and then collide with each other to mix. In this way, two different chemical liquids are mixed and sprayed in mist form toward the tip side.

[0070] In the medical spray device 12 of this embodiment, the opening ends 40, 40 of the first liquid discharge hole 36 and the second liquid discharge hole 38 are located on either side of the mountain-like inclined surfaces 28, 28 on either side of the ridge line 26, preventing the two liquids sprayed as mist from being immediately mixed together after being discharged from the opening ends 40, 40. This prevents problems such as the medicinal liquids gelling after mixing and adhering to the periphery of the opening ends 40, 40 and impairing the spray state.

[0071] In particular, in this embodiment, the opening ends 40, 40 of the first liquid discharge hole 36 and the second liquid discharge hole 38 are formed in a generally elliptical shape on the mountain-like inclined surfaces 28, 28, and therefore the opening area is larger than the cross-sectional area in the direction perpendicular to the axis of the first liquid discharge hole 36 and the second liquid discharge hole 38. This allows the chemical liquid to be efficiently dispersed from the large opening area, and the gas ejected from the first gas injection hole 56 and the second gas injection hole 58 acts efficiently on the chemical liquid, improving the action due to the Coanda effect and the like, thereby allowing the chemical liquid to be sprayed more effectively and stably.

[0072] Furthermore, by setting the direction of gas ejection from the first gas injection hole 56 and the second gas injection hole 58 so that it roughly follows the surface of the mountain-shaped inclined faces 28, 28 into which the first liquid discharge hole 36 and the second liquid discharge hole 38 open, a more efficient atomization effect is exerted on each chemical liquid ejected from each opening end 40, 40 of the first liquid discharge hole 36 and the second liquid discharge hole 38, and the flow of the mist-like chemical liquid can be stabilized, making it possible to spray the mist-like mixed chemical liquid more smoothly by avoiding it from accumulating in any particular location.

[0073] The mist-like mixed chemical solution is then guided by the gas flow toward the tip along the upper surface 24 of the lower protruding portion 22, but because the cut end surface 30 is formed at the tip of the upper surface 24, it is possible to prevent the mist-like mixed chemical solution and any gelled or other deposits from concentrating at a single point at the tip of the upper surface 24. In addition, because the tip portion of the lower protruding portion 22 is formed with the outer peripheral inclined surface 32, it is possible to reduce the problem of the mist-like mixed chemical solution and its gelled substance being drawn toward the tip along the upper surface 24 being drawn in from the tip edge of the upper surface 24 and adhering to the outer peripheral surface.

[0074] Furthermore, in this embodiment, the opening ends 62, 62 of the first gas injection holes 56 and the second gas injection holes 58 extend further outward on both sides in the left and right width direction than the opening ends 40, 40 of the first liquid discharge holes 36 and the second liquid discharge holes 38 (for example, La > Lb in FIG. 2 ). As a result, the chemical liquid discharged from the first liquid discharge holes 36 and the second liquid discharge holes 38 is sprayed so as to be surrounded by the gas ejected from the first gas injection holes 56 and the second gas injection holes 58, and outward scattering in particular to the left and right is suppressed, thereby making it possible to efficiently and stably mix the sprayed chemical liquid.

[0075] In particular, in this embodiment, the front inclined surface 50 where the first gas injection holes 56 and the second gas injection holes 58 open is formed as a valley-shaped inclined surface 54, 54, and therefore, as can be seen in Figure 4, for example, the left and right widthwise outer ends of the opening ends 62, 62 of each gas injection hole 56, 58 are located axially further forward than the left and right widthwise inner ends. This causes the gas discharged from each opening end 62, 62 to be directed from the outside to the inside in the left and right width direction, making it possible to more effectively prevent the chemical liquid discharged from the first liquid discharge hole 36 and the second liquid discharge hole 38 from scattering outward to the left and right.

[0076] Additionally, in this embodiment, a visor-shaped portion 66 is provided that extends forward and surrounds the periphery of the forward inclined surface 50 where the first gas injection holes 56 and the second gas injection holes 58 open. This visor-shaped portion 66 prevents the gas ejected from the opening ends 62, 62 of the first gas injection holes 56 and the second gas injection holes 58 from diffusing to the surroundings, thereby generating a more stable and effective forward gas flow. Moreover, the visor-shaped portion 66 also covers the opening ends 40, 40 of the first liquid discharge holes 36 and the second liquid discharge holes 38 that open to the upper surface 24 of the lower protrusion 22, and therefore can stably guide the mist-like chemical liquid ejected from the opening ends 40, 40 of the first liquid discharge holes 36 and the second liquid discharge holes 38 and sprayed by the gas ejected from the opening ends 62, 62 of the first gas injection holes 56 and the second gas injection holes 58 forward while preventing it from scattering to the surroundings.

[0077] Although one embodiment of the present invention has been described above, the present invention should not be construed as being limited by the description of the above embodiment.

[0078] For example, as shown in the medical spray device 12' illustrated in Fig. 8, the central axes of the first gas injection holes 56' and second gas injection holes 58' provided through the upper vertical wall portion 48 may be inclined so as to gradually approach each other in the left-right width direction from the base end toward the tip end (opening ends 62, 62). Note that it is desirable that the first gas injection holes 56' and second gas injection holes 58' be inclined downward from the base end toward the tip end in the vertical direction, inclined in approximately the same direction as the ridge line 26, as in the first embodiment shown in Fig. 3.

[0079] By tilting the first gas injection holes 56' and the second gas injection holes 58' in a direction approaching the center in the left-right direction from the base end to the tip end in this manner, it is possible to more efficiently suppress outward diffusion of the gas ejected from the first gas injection holes 56' and the second gas injection holes 58' to both the left and right. Furthermore, it is also possible to suppress diffusion in the left-right width direction of the chemical liquid sprayed in mist form from the first liquid discharge holes 36 and the second liquid discharge holes 38 located in front of the openings of the first gas injection holes 56' and the second gas injection holes 58', thereby making it possible to efficiently mix the two chemical liquids.

[0080] Furthermore, as shown in the medical spray device 12" exemplified in Figure 9, the first liquid discharge hole 36 and the second liquid discharge hole 38 that penetrate the inside of the lower protruding portion 22 and open onto the mountain-shaped inclined surfaces 28, 28 on both the left and right sides may also be bent toward their opening portions so that they open with central axes that are approximately perpendicular to the mountain-shaped inclined surfaces 28, 28. Furthermore, by appropriately adjusting the angle and direction of the bend at the opening portions of the first liquid discharge hole 36 and the second liquid discharge hole 38, it is also possible to adjust and set the shape, size, position, etc. of the opening ends 40', 40' that open onto the mountain-shaped inclined surfaces 28, 28.

[0081] 10 and 11 show a medical spray device 68 of another embodiment. As with FIGS. 8 and 9, components and parts having the same structure as those in the first embodiment are designated by the same reference numerals as those in the first embodiment, and their description will be omitted. That is, in this medical spray device 68, the upper surface (inner peripheral surface) 24 of the lower protrusion 22 serving as the distal end protrusion serves as the liquid discharge surface where the first and second liquid discharge ports 36, 38 open. Meanwhile, the lower surface (outer peripheral surface) of the lower protrusion 22, which is behind the liquid discharge surface, has a cavity 70 that opens at the outer peripheral surface 20.

[0082] The cavity 70 is not limited to a specific shape or size, but in this embodiment, it has a shape in which the radial depth gradually increases from the distal end toward the proximal end along the upper surface 24. As a result, the bottom surface 72 on the distal end side of the cavity 70 is an inclined surface, and a wall thickness is ensured to form the upper surface 24 where the first and second liquid discharge ports 36, 38 open. Note that, in this embodiment, the cavity 70 extends to the back side of the forward inclined surface (gas ejection surface) 50, but the shape is not limited to this.

[0083] The formation of cavity 70 reduces the axial dimension of back surface (outer peripheral surface) 20a, which is located behind top surface 24 and extends in the axial direction, at the tip portion of lower protrusion 22. As a result, even if the mixed medicinal liquid or its gelled substance discharged from first liquid discharge hole 36 and second liquid discharge hole 38 and guided along top surface 24 toward the tip end side is rolled in from the tip edge of top surface 24 toward the outer peripheral side, the adhesion area from cut end surface 30 to back surface 20a can be reduced. Furthermore, the mixed medicinal liquid or gelled substance adhering there can be blown away toward the tip end side (in the direction of spraying toward the patient) by gas injected from first and second gas injection holes 56, 58 before it completely solidifies.

[0084] In the medical spray device 68 of this embodiment, notches 76 are formed in the circumferential end portions of the eave portion 66 that connect to the upper surface 24 of the lower protruding portion 22, thereby reducing the protruding length of the eave portion 66. This reduces or prevents the accumulation of the mixed medicinal solution and its gelled substance at the connecting corners with the eave portion 66 located at both widthwise end portions of the upper surface 24 of the lower protruding portion 22. However, the size and shape of such notches 76 are not limited, and the use of such notches 76 is optional.

[0085] Furthermore, in the medical spray device 12 of the above embodiment, the entire device, including the hill-shaped inclined surfaces 28, 28, the first liquid discharge holes 36, the second liquid discharge holes 38, the first gas injection holes 56, the valley-shaped inclined surfaces 54, 54, the second gas injection holes 58, and the overhanging portion 66, is formed with a symmetrical structure on both the left and right sides. However, an asymmetrical structure can also be adopted partially or entirely. For example, the first liquid discharge holes 36 and the second liquid discharge holes 38 can be formed with different cross-sectional areas or opening areas, and the first gas injection holes 56 and the second gas injection holes 58 can be formed with different cross-sectional areas or opening areas correspondingly. Such an embodiment can be suitably adopted, for example, when the mixing ratio of two types of liquid is not equal. Furthermore, the number of liquid injection holes and gas injection holes is not limited to one on each side. Different numbers of liquid injection holes and / or gas injection holes can also be provided on the left and right sides. For example, a total of three, four, or more liquid injection holes and / or gas injection holes can be provided.

[0086] Furthermore, in the medical spray device 12 of the above embodiment, the first gas injection hole 56 and the second gas injection hole 58 are used as gas injection holes, but the number and shape of the gas injection holes are not limited, and it is also possible to use, for example, a single slit-shaped gas injection hole that extends in the left and right width directions on the forward inclined surface 50.

[0087] Furthermore, the ridge portion need only extend from the base end toward the tip end on the liquid discharge surface at the tip end of the flow path member to form a mountain-shaped inclined surface in which the first liquid discharge hole and the second liquid discharge hole open on one side of each surface, and is not limited to the linear ridge line 26 exemplified in the embodiment. For example, it is possible to provide a recessed groove or a protruding stripe extending over the entire length or part of the ridge line 26, to provide a flat surface at the apex of the ridge line 26, to partially lower the height of the ridge line 26 in the length direction of the ridge line 26 to change the inclination angle of the mountain-shaped inclined surfaces on both sides, or to curve the ridge line 26, which makes it possible to adjust, for example, the mixed state of the liquid discharged from the first and second liquid discharge holes or to adjust the flow of gas injected from the gas injection holes.

[0088] Similarly to the ridge portion, the valley bottom is not limited to the linear valley line 52 illustrated in the embodiment, but may be any valley-shaped inclined surface that opens on one side of each of the first gas injection holes 56 and the second gas injection holes 58. For example, a groove or a ridge extending along the valley line 52 may be provided, the bottom of the valley line 52 may be flat or curved, the depth or shape of the valley bottom may be varied along the length of the valley line 52, or the valley line 52 may be curved.

[0089] Furthermore, although the medical spray device 12 has been illustrated as a preferred embodiment in the above embodiment, it is not necessarily required to provide, for example, the eaves portion 66, the cut end surface 30, the outer peripheral inclined surface 32, and the like.

[0090] Furthermore, the medical spray device 12 in the above embodiment has an assembled structure in which multiple components are combined together, taking into consideration the formation of the gas supply path 60, etc., but the specific component structure is not limited, and it is also possible, for example, to drill and form first and second liquid discharge holes and gas injection holes in a single block.

[0091] Furthermore, the medical spray device to which the tip portion of the present invention is applied is not limited in its specific use. That is, the medical spray device of the present invention may be inserted into the body via the working channel of an endoscope or may be inserted into a patient's body through an incision made during abdominal surgery, for example, to spray a liquid substance into the body. Examples of medicinal liquids supplied through the first liquid discharge hole 36 and the second liquid discharge hole 38 include bioadhesives and hemostatic agents that increase in viscosity when mixed together to cover a wound, but the specific medicinal liquids used are not limited.

[0092] 12 Medical spray device 14 Flow path tube 16 Step 18 Fitting surface 20 Exposed surface 22 Lower protrusion (tip protrusion) 24 Upper surface 26 Ridge line 28 Mountain-shaped inclined surface 30 Cut-shaped end surface 32 Outer peripheral inclined surface 36 First liquid discharge hole 38 Second liquid discharge hole 40 Opening end 42 Minor axis 44 Major axis 48 Upper vertical wall portion 50 Forward inclined surface (gas injection surface) 52 Valley line 54 Valley-shaped inclined surface 56 First gas injection hole 58 Second gas injection hole 60 Gas supply path 62 Opening end 66 Eave-shaped portion 68 Medical spray device 70 Cavity portion 72 Bottom surface 76 Notched portion

Claims

1. A medical spray device having a flow path member having a liquid discharge hole and a gas injection hole at the tip portion thereof, in which a medicinal liquid is discharged from the liquid discharge hole and sprayed in a mist by gas injected from the gas injection hole, the liquid discharge holes comprising a first liquid discharge hole and a second liquid discharge hole through which different medicinal liquids are discharged, the tip surface of the flow path member being formed with a liquid discharge surface that protrudes while sloping outward toward the tip of the flow path member, the liquid discharge surface being a mountain-shaped inclined surface with a ridge portion extending from the base end side of the flow path member toward the tip side, the first liquid discharge hole opening on one side of the inclined surface sandwiching the ridge portion, and the second liquid discharge hole opening on the other side.

2. A medical spray device as described in claim 1, wherein the opening of the gas injection hole is located closer to the base end of the flow path member than the openings of the first liquid discharge hole and the second liquid discharge hole, and the gas injection hole opens at an angle in the direction of the inclination of the liquid discharge surface.

3. A medical spray device according to claim 1 or 2, wherein the gas injection holes have a first gas injection hole and a second gas injection hole, and when viewed from the front of the tip surface of the flow path member, the centers of the openings of the first gas injection hole and the second gas injection hole are both located outside in the direction of separation from each other relative to the centers of the openings of the first liquid discharge hole and the second liquid discharge hole.

4. A medical spray device according to claim 1 or 2, wherein the liquid ejection surface is provided in a partial region on the tip surface of the flow path member, and a gas injection surface is formed in a region different from the liquid ejection surface, the gas injection surface is inclined toward the liquid ejection surface more than a plane perpendicular to the central axis of the flow path member, and the gas injection holes open into the gas injection surface.

5. A medical spray device according to any one of claims 1 to 4, wherein the gas injection holes have a first gas injection hole and a second gas injection hole, the liquid ejection surface is provided in a partial region on the tip end surface of the flow path member, and the gas injection surface is formed in a region different from the liquid ejection surface, and the gas injection surface is a valley-shaped inclined surface, and when viewed from the front on the tip end surface of the flow path member, the first gas injection hole opens on one surface sandwiching the valley bottom of the valley-shaped inclined surface, and the second gas injection hole opens on the other surface.

6. A medical spray device as described in claim 5, wherein the angle of intersection between the mountain-shaped inclined surface and the valley-shaped inclined surface is 90±30 degrees on at least one of the following planes: a plane that includes the center of the opening of the first liquid discharge hole and the center of the opening of the first gas injection hole and is perpendicular to the liquid discharge surface on which the first liquid discharge hole opens; and a plane that includes the center of the opening of the second liquid discharge hole and the center of the opening of the second gas injection hole and is perpendicular to the liquid discharge surface on which the second liquid discharge hole opens.

7. A medical spray device as claimed in claim 5 or 6, wherein the angle of intersection between the valley-shaped slope and at least one of a plane that includes the centre of the opening of the first liquid discharge hole and the centre of the opening of the first gas injection hole and is perpendicular to the liquid discharge surface on which the first liquid discharge hole opens, and a plane that includes the centre of the opening of the second liquid discharge hole and the centre of the opening of the second gas injection hole and is perpendicular to the liquid discharge surface on which the second liquid discharge hole opens, is 90±30 degrees.

8. A medical spray device according to any one of claims 1 to 7, wherein the gas injection holes include a first gas injection hole having an opening facing the opening of the first liquid discharge hole and a second gas injection hole having an opening facing the opening of the second liquid discharge hole, and the extension line of the central axis on the opening side of the first gas injection hole and the extension line of the central axis on the opening side of the second gas injection hole are inclined in directions approaching each other.

9. A medical spray device as claimed in any one of claims 1 to 8, wherein the liquid discharge surface is formed by a tip protrusion provided on the tip surface of the flow path member so as to partially protrude towards the tip, and the tip edge of the tip protrusion is a cut end surface that extends in the thickness direction of the tip protrusion between the outer circumferential surface of the flow path member and the liquid discharge surface.

10. A medical spray device as claimed in any one of claims 1 to 9, wherein the liquid discharge surface is formed by a tip protrusion that is provided on the tip surface of the flow path member and protrudes partially towards the tip, and the outer peripheral surface of the tip portion of the tip protrusion is provided with an outer peripheral inclined surface that is inclined in the direction approaching the liquid discharge surface towards the tip side.

11. A medical spray device as claimed in any one of claims 1 to 10, wherein the liquid discharge surface is formed by a tip protrusion provided on the tip surface of the flow path member so as to partially protrude towards the tip, and the tip protrusion is provided with a cavity that opens onto the outer peripheral surface behind the liquid discharge surface.

12. A medical spray device according to any one of claims 1 to 11, wherein the tip surface of the flow path member is provided with a visor-like portion extending from the outer periphery toward the tip, and when viewed from the side of the flow path member, the entire opening of the gas injection hole is covered by the visor-like portion, and at least half of the openings of the first liquid discharge hole and the second liquid discharge hole are covered by the visor-like portion.

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