CN115484873A - Medical applicator - Google Patents

Abstract

A nozzle (16) of a medical application device (10) has a liquid feeding section (46) and a gas supply member (50). The liquid feeding unit (46) includes a double-walled pipe section (62) in which a 2 nd pipe (60) is disposed inside a 1 st pipe (58), the double-walled pipe section (62) extending from a base end portion of the gas supply member (50) toward a base end side of the nozzle (16), the liquid feeding unit (46) including: a 1 st portion (47 a) extending to the tip side of the nozzle (16) than the base end of the gas supply member (50); and a 2 nd portion (47 b) that extends to the base end side of the nozzle (16) than the base end of the gas supply member (50). The double-walled pipe section (62) in the 2 nd section (47 b) is longer than the 1 st section (47 a).

Description

Medical applicator

Technical Field

The present invention relates to a medical applicator.

Background

For example, japanese patent application laid-open No. 2009-131590 discloses a medical applicator including a nozzle for spraying a mixed solution (an anti-adhesion material, a biological tissue adhesive, or the like) obtained by mixing a first solution 1 and a second solution 2 to a target site in a living body. The nozzle includes: a liquid feeding unit having a 1 st tube through which a 1 st liquid flows and a 2 nd tube through which a 2 nd liquid flows; and a gas supply member provided at a distal end portion of the liquid feeding portion, forming a mixing chamber for mixing the 1 st liquid and the 2 nd liquid, and supplying a gas into the mixing chamber. The liquid feeding portion is formed by arranging the 1 st tube and the 2 nd tube in parallel with each other on the base end side of the nozzle from the base end of the gas supply member (see, for example, fig. 19 of jp 2009-131590 a).

Disclosure of Invention

Problems to be solved by the invention

The nozzle of the medical applicator is inserted into a living body, and therefore, it is desired to reduce the diameter. However, in the above-described conventional technique, the liquid feeding portion is such that the 1 st tube and the 2 nd tube are arranged in parallel with each other on the base end side of the nozzle with respect to the base end of the gas supply member. Therefore, the outer diameter of the liquid feeding portion is less likely to be reduced on the base end side of the nozzle than the base end of the gas supply member.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a medical applicator capable of reducing the diameter of a nozzle or the injection resistance of at least one of the first liquid 1 and the second liquid 2 without increasing the nozzle diameter.

One aspect of the present invention is a medical application instrument including a nozzle for spraying a mixed liquid in which a 1 st liquid and a 2 nd liquid are mixed into a living body, the medical application instrument including: a liquid feeding unit including a 1 st tube through which the 1 st liquid flows and a 2 nd tube through which the 2 nd liquid flows; and a gas supply member provided at a distal end portion of the liquid supply portion, the gas supply member forming a mixing chamber for mixing the 1 st liquid and the 2 nd liquid and supplying a gas into the mixing chamber, wherein the liquid supply portion includes a double-walled pipe portion in which the 2 nd pipe is disposed inside the 1 st pipe, the double-walled pipe portion extending from a proximal end portion of the gas supply member toward a proximal end side of the nozzle, and the liquid supply portion includes a 1 st portion extending toward the distal end side of the nozzle from the proximal end of the gas supply member and a 2 nd portion extending toward the proximal end side of the nozzle from the proximal end of the gas supply member, and the double-walled pipe portion in the 2 nd portion is longer than the 1 st portion.

According to the present invention, the liquid feeding portion includes a double-walled pipe portion in which the 2 nd pipe is disposed inside the 1 st pipe, and the double-walled pipe portion extends from the base end portion of the gas supply member toward the base end side of the nozzle. The liquid feeding portion has a 1 st portion extending toward the tip end of the nozzle from the base end of the gas supply member and a 2 nd portion extending toward the base end of the nozzle from the base end of the gas supply member, and the double-walled tube portion in the 2 nd portion is longer than the 1 st portion. Therefore, the outer diameter of the 2 nd portion of the liquid feeding portion can be made small. This enables the nozzle to have a smaller diameter. Further, if the nozzle diameter is not reduced (the same nozzle diameter as the conventional one), the diameter of the 1 st pipe can be increased, and therefore, at least one of the flow path cross-sectional area of the 1 st pipe and the flow path cross-sectional area of the 2 nd pipe is increased. This makes it possible to reduce the injection resistance of at least one of the 1 st and 2 nd liquids without increasing the nozzle diameter.

Drawings

FIG. 1 is a schematic configuration diagram of a medical applicator according to an embodiment of the present invention.

Figure 2 is a longitudinal cross-sectional view of the nozzle of figure 1.

Fig. 3 is an enlarged sectional view of the tip side of the nozzle of fig. 2.

Fig. 4 is a cross-sectional view taken along line IV-IV of fig. 3.

Fig. 5 is an explanatory view of a method of using the medical application instrument of fig. 1.

Detailed Description

Hereinafter, a medical application instrument according to the present invention will be described with reference to the drawings by referring to preferred embodiments.

As shown in fig. 5, the medical application instrument 10 according to one embodiment of the present invention is, for example, a spray type application instrument that sprays (sprays) an anti-adhesion material (mixed liquid G) for preventing post-surgical adhesion to a target site 208 (damaged site) in a living body. Specifically, the medical applicator 10 is used in laparoscopic surgery. In this case, the medical applicator 10 is inserted into the abdominal cavity 206 through the trocar 204. The medical applicator 10 is not limited to the example used in laparoscopic surgery, and can be used in laparoscopic surgery. The medical applicator 10 may be an applicator for spraying a living tissue adhesive (mixed solution) for adhering living tissue to a target site in a living body.

As shown in fig. 1 and 5, the medical application tool 10 sprays a mixed liquid G obtained by mixing a 1 st liquid M1 and a 2 nd liquid M2 with a gas. The 1 st liquid M1 is an acidic liquid. The 2 nd liquid M2 is an alkaline liquid (hardening material). The viscosity of the 1 st liquid M1 is higher than that of the 2 nd liquid M2. The volume ratio of the 1 st liquid M1 to the 2 nd liquid M2 in the mixed liquid G is preferably 4:1 (1 st liquid M1: 2 nd liquid M2= 4:1). The volume ratio of the 1 st liquid M1 to the 2 nd liquid M2 in the mixed liquid G can be appropriately set. The 1 st liquid M1 may be an alkaline or neutral liquid, and the 2 nd liquid M2 may be an acidic or neutral liquid.

When the mixed solution G is an anti-blocking material, for example, a mixture of NHS-formed CM dextrin with trehalose hydrate is used as the 1 st liquid M1, and a mixture of sodium carbonate and sodium bicarbonate is used as the 2 nd liquid M2. The 1 st liquid M1 and the 2 nd liquid M2 are mixed with a gas (compressed air) to be gelled. The gelled mixture G is white including a micro valve. Therefore, the mixed solution G can be reliably retained at the target site 208 in the living body, and can be easily visually recognized.

In fig. 1, a medical application tool 10 includes a liquid supply unit 12, a gas supply device 14, and a nozzle 16.

The liquid supply unit 12 supplies the 1 st liquid M1 and the 2 nd liquid M2 to the nozzle 16. The liquid supply section 12 has an injector section 18 and a pusher 20. The injector portion 18 is integrally molded from a resin material. The syringe part 18 includes a 1 st syringe outer cylinder 22 (1 st liquid supply part), a 2 nd syringe outer cylinder 24 (2 nd liquid supply part), a coupling part 26, and a flange part 28.

The 1 st syringe barrel 22 and the 2 nd syringe barrel 24 are arranged side by side so that the axis of the 1 st syringe barrel 22 and the axis of the 2 nd syringe barrel 24 are parallel to each other. The 1 st syringe outer cylinder 22 contains the 1 st liquid M1. The 2 nd syringe outer cylinder 24 contains the 2 nd liquid M2. The 1 st syringe barrel 22 has a larger volume than the 2 nd syringe barrel 24. Specifically, the volume of the 1 st syringe barrel 22 is 4 times the volume of the 2 nd syringe barrel 24. The volumes of the 1 st syringe outer tube 22 and the 2 nd syringe outer tube 24 can be set as appropriate. The overall length of the 1 st syringe barrel 22 is the same as the overall length of the 2 nd syringe barrel 24.

The coupling portion 26 couples the distal end side of the 1 st syringe outer tube 22 and the distal end side of the 2 nd syringe outer tube 24 to each other. The flange 28 is connected to the base end of the 1 st syringe outer tube 22 and the base end of the 2 nd syringe outer tube 24. The flange 28 extends in the direction in which the 1 st syringe outer cylinder 22 and the 2 nd syringe outer cylinder 24 are arranged. The flange portion 28 is formed in a size capable of hooking a finger of a user.

The pusher 20 has a 1 st washer 30, a 2 nd washer 32, a 1 st pusher body 34, a 2 nd pusher body 36, a pusher coupling portion 38, and a pressing portion 40. The 1 st gasket 30 is disposed in the inner cavity of the 1 st syringe outer cylinder 22 so as to be slidable in the axial direction of the 1 st syringe outer cylinder 22. The 1 st gasket 30 is in liquid-tight contact with the inner peripheral surface of the 1 st syringe outer cylinder 22. The 2 nd gasket 32 is disposed in the inner cavity of the 2 nd syringe outer cylinder 24 so as to be slidable in the axial direction of the 2 nd syringe outer cylinder 24. The 2 nd gasket 32 is in liquid-tight contact with the inner peripheral surface of the 2 nd syringe outer cylinder 24. The 1 st gasket 30 and the 2 nd gasket 32 are each made of an elastic material such as rubber.

The 1 st pusher main body 34, the 2 nd pusher main body 36, the pusher coupling portion 38, and the pressing portion 40 are integrally molded from a resin material. The 1 st pusher body 34 pushes the 1 st gasket 30 toward the distal end of the 1 st syringe outer cylinder 22. The 1 st pusher body 34 extends in the axial direction of the 1 st syringe outer cylinder 22. One end of the 1 st pusher body 34 is coupled to the 1 st washer 30. The 2 nd pusher main body 36 presses the 2 nd gasket 32 toward the distal end of the 2 nd syringe outer cylinder 24. The 2 nd pusher body 36 extends in the axial direction of the 2 nd syringe outer cylinder 24. One end of the 2 nd pusher main body 36 is coupled to the 2 nd washer 32.

The pusher connecting portion 38 connects the other end portion of the 1 st pusher main body 34 and the other end portion of the 2 nd pusher main body 36 to each other. The pressing portion 40 is provided at the other end portion of the 1 st pusher main body 34. The pressing portion 40 is located on the axis of the 1 st pusher body 34. The pressing portion 40 is formed in a plate shape.

The gas supply device 14 is connected to the nozzle 16 via a gas supply pipe 42. The gas supply device 14 supplies gas (compressed air). The gas pressure of the gas supply device 14 is set to, for example, 0.1MPa. The gas pressure of the gas supply device 14 can be set as appropriate, and is preferably set to 0.01MPa to 0.2 MPa.

As shown in fig. 2, the nozzle 16 includes a shaft 44, a liquid feeding portion 46, a support member 48, a gas supply member 50, a nozzle pipe 52, a tip 54, and a sheath member 56. In the following description, the side of the nozzle 16 where the discharge port 84 for spraying the mixed liquid G is located is referred to as a "tip end", and the opposite side is referred to as a "base end".

The shaft portion 44 is a tubular member extending in one direction. Shaft portion 44 has a constant inner diameter and a constant outer diameter over its entire length. The shaft 44 is preferably made of, for example, stainless steel. The material of the shaft 44 can be appropriately set. That is, the shaft portion 44 may be made of a metal material such as titanium, a titanium alloy, aluminum, an aluminum alloy, or an iron alloy (other than stainless steel), a hard resin material, or ceramics.

The overall length of the shaft 44 is preferably set to 100mm to 500mm, more preferably 200mm to 400mm, and still more preferably 250mm to 350 mm. The entire length of the shaft portion 44 can be set as appropriate.

In fig. 2 to 4, the liquid feeding portion 46 is inserted into the inner cavity of the shaft portion 44. The liquid feeding unit 46 has a 1 st pipe 58 through which the 1 st liquid M1 flows and a 2 nd pipe 60 through which the 2 nd liquid M2 flows. The 1 st tube 58 and the 2 nd tube 60 may be respectively flexible, or may be made of a hard material. Preferably, the 1 st tube 58 and the 2 nd tube 60 are each made of Polyetheretherketone (PEEK). In this case, the thickness of each of the 1 st tube 58 and the 2 nd tube 60 can be made thin. Therefore, the liquid feeding portion 46 can be reduced in diameter.

The constituent material of each of the 1 st tube 58 and the 2 nd tube 60 can be set as appropriate. That is, the 1 st tube 58 and the 2 nd tube 60 may be made of a resin material (for example, urethane rubber) or a metal material other than PEEK. The 1 st tube 58 has an inner diameter greater than the outer diameter of the 2 nd tube 60.

In fig. 2, the liquid feeding portion 46 includes a double-walled pipe portion 62 in which a 2 nd pipe 60 is disposed inside a 1 st pipe 58. The overall length L1 of the double-walled tube portion 62 is longer than the overall length L2 of the shaft portion 44. In other words, the double-walled tube portion 62 penetrates the shaft portion 44 over the entire length of the shaft portion 44. A gas flow passage 64 through which gas flows is formed between the outer peripheral surface of the double-walled pipe portion 62 (the 1 st pipe 58) and the inner peripheral surface of the shaft portion 44.

As shown in fig. 2 and 3, the 1 st tip opening 58a of the 1 st tube 58 and the 2 nd tip opening 60a of the 2 nd tube 60 are located at the tip of the double-walled tube portion 62. The tip of the 2 nd pipe 60 may be positioned closer to the base end of the nozzle 16 than the tip of the 1 st pipe 58, or closer to the tip of the nozzle 16 than the tip of the 1 st pipe 58.

The double-walled pipe portion 62 protrudes toward the tip end of the nozzle 16 from the tip end of the shaft portion 44. The distal end portion of the double-walled tube portion 62 is inserted into the inner cavity of the tubular (tubular) gas supply member 50. At the tip end of the double-walled tube portion 62, the 1 st tube 58 is radially inwardly reduced in diameter. The double-walled pipe portion 62 extends from the base end portion of the gas supply member 50 toward the base end side of the nozzle 16.

In fig. 2, the liquid feeding portion 46 includes: a 1 st portion 47a extending toward the tip end side of the nozzle 16 than the base end of the gas supply member 50; and a 2 nd portion 47b extending toward the base end side of the nozzle 16 than the base end of the gas supply member 50. The length L3 of the double-walled tube portion 62 in the 2 nd portion 47b is longer than the length L4 of the 1 st portion 47 a. The length L3 is a length from the base end of the gas supply member 50 to the base end of the double-walled tube portion 62. The length L4 is a length from the distal end of the double-walled tube portion 62 (liquid feeding portion 46) to the proximal end of the gas supply member 50 (the length of the portion of the double-walled tube portion 62 inserted into the inner cavity of the gas supply member 50). The double-walled pipe portion 62 protrudes toward the base end of the nozzle 16 from the base end of the shaft portion 44.

The double-walled pipe portion 62 has a coaxial portion 63 disposed coaxially with the 1 st pipe 58 and the 2 nd pipe 60. The coaxial portion 63 extends from the distal end of the liquid feeding portion 46 toward the proximal end side of the nozzle 16. The base end of the shaft portion 63 is located closer to the base end of the nozzle 16 than the base end of the shaft portion 44. That is, the length of the coaxial portion 63 is longer than the entire length of the shaft portion 44. The axis of the 1 st tube 58 and the axis of the 2 nd tube 60 are arranged to be offset from each other over the entire length of the double-walled tube portion 62.

In the double-walled tube portion 62, the 1 st flow path sectional area S1 of the 1 st tube 58 (the sectional area of the space between the outer peripheral surface of the 2 nd tube 60 and the inner peripheral surface of the 1 st tube 58) is larger than the 2 nd flow path sectional area S2 of the 2 nd tube 60 (the sectional area of the lumen of the 2 nd tube 60) (see fig. 4). The size of each of the 1 st channel cross-sectional area S1 and the 2 nd channel cross-sectional area S2 is appropriately set in accordance with the viscosity and the liquid amount of each of the 1 st liquid M1 and the 2 nd liquid M2.

A hole 66 for guiding the 2 nd pipe 60 to the outside of the 1 st pipe 58 is formed in the peripheral wall portion of the 1 st pipe 58 on the proximal end side of the nozzle 16 with respect to the proximal end of the shaft portion 44. The wall surface forming the hole 66 and the outer peripheral surface of the 2 nd pipe 60 are sealed in a liquid-tight manner by a sealing member, not shown. That is, the 1 st tube 58 and the 2 nd tube 60 are divided into two at the base end portion of the liquid feeding portion 46.

The support member 48 supports the base end of the 1 st tube 58 and the base end of the 2 nd tube 60 in a state of being provided at the base end of the shaft 44. The support member 48 is integrally molded from a hard resin material.

The support member 48 includes a support main body 68, a 1 st connection portion 70, and a 2 nd connection portion 72. The support body 68 is formed to cover the base end portion of the 1 st tube 58 and the base end portion of the 2 nd tube 60. The support body 68 is formed to be wider from a distal end portion connected to a proximal end portion of the shaft portion 44 toward the proximal end portion. The air supply pipe 42 is connected to the distal end portion of the support main body 68. The support member 48 is formed with: a gas introduction hole 74 through which the gas introduced from the gas supply pipe 42 is introduced; a 1 st arrangement hole 76 in which a proximal end portion of the 1 st tube 58 is arranged; and a 2 nd arrangement hole 78 for the base end portion of the 2 nd tube 60.

The gas introduction hole 74 opens at the front end surface of the support main body 68. The proximal end portion of the shaft portion 44 is inserted into the gas introduction hole 74. The outer peripheral surface of the base end portion of the shaft portion 44 is hermetically joined to the inner surface of the gas introduction hole 74. The gas introduction hole 74 communicates with the gas flow path 64. The hole portion 66 of the 1 st tube 58 is located at the gas introduction hole 74. That is, a portion (branching portion) of the liquid feeding portion 46 where the 1 st tube 58 and the 2 nd tube 60 branch into two is positioned in the gas introduction hole 74.

The 1 st arrangement hole 76 is provided on the base end side of the gas introduction hole 74. The outer peripheral surface of the base end portion of the 1 st tube 58 contacts the inner surface of the 1 st arrangement hole 76. The 2 nd arrangement hole 78 is provided on the base end side of the gas introduction hole 74. The outer peripheral surface of the base end portion of the 2 nd tube 60 contacts the inner surface of the 2 nd arrangement hole 78.

The 1 st connection part 70 and the 2 nd connection part 72 protrude from the base end surface of the support main body 68. The 1 st connecting portion 70 is formed with a 1 st connecting hole 70a which is liquid-tightly fitted to the distal end portion of the 1 st syringe outer cylinder 22. The 1 st coupling hole 70a is tapered as it goes from the projecting end of the 1 st coupling part 70 toward the support body 68. The 1 st connecting hole 70a communicates with the 1 st base end opening 58b of the 1 st tube 58. The 2 nd connecting portion 72 is formed with a 2 nd connecting hole 72a which is liquid-tightly fitted to the distal end portion of the 2 nd syringe outer cylinder 24. The 2 nd connecting hole 72a is tapered as it goes from the projecting end of the 2 nd connecting part 72 toward the support main body 68. The 2 nd connecting hole 72a communicates with the 2 nd base end opening 60b of the 2 nd pipe 60.

As shown in fig. 3, the gas supply member 50 is a gas transmission tube provided at the distal end of the liquid feeding portion 46 and forming a mixing chamber 51 for mixing the 1 st liquid M1 and the 2 nd liquid M2 with gas. The reduced diameter distal end of the liquid feeding portion 46 is inserted into the proximal end of the gas supply member 50. The gas supply member 50 is liquid-tightly bonded to the outer peripheral surface of the liquid feeding portion 46 (the 1 st tube 58). The tip of the shaft 44 is located closer to the base end of the nozzle 16 than the base end of the gas supply member 50.

The gas supply member 50 is made of a flexible material. The wall of the gas supply member 50 is formed to be impermeable to liquid. The wall of the gas supply member 50 is preferably formed to allow the gas to permeate from the outside into the mixing chamber 51 and to suppress or prevent the gas from permeating from the mixing chamber 51 to the outside.

The gas supply member 50 is formed in a tubular shape by a hydrophobic filter. Specifically, the gas supply member 50 is preferably formed in a tubular shape from Polytetrafluoroethylene (PTFE). The gas supply member 50 may be formed in a tubular shape by a hydrophilic filter. The gas supply member 50 may be a tubular net member. In this case, the mesh size of the net is set to a size that does not allow the 1 st liquid M1 and the 2 nd liquid M2 to permeate therethrough. The gas supply member 50 may be formed of a tightly wound coil spring. In this case, the pitch of the coils is preferably set to a size that allows the gas to flow into the mixing chamber 51 from the outside of the gas supply member 50 and prevents or inhibits the 1 st liquid M1 and the 2 nd liquid M2 from passing through the mixing chamber 51 to the outside of the gas supply member 50.

The nozzle pipe 52 is disposed on the outer peripheral side of the gas supply member 50. In other words, the gas supply member 50 is inserted into the nozzle pipe 52. The tip of the gas supply member 50 protrudes toward the tip of the nozzle 16 beyond the tip opening 52a of the nozzle pipe 52. The inner peripheral surface of the base end portion of the nozzle pipe 52 is airtightly joined to the outer peripheral surface of the tip end portion of the shaft portion 44. The nozzle pipe 52 is made of a material having flexibility. The walls of the nozzle tube 52 are impervious to gas. The nozzle pipe 52 is made of a soft resin material such as polyurethane. The material of the nozzle pipe 52 can be set as appropriate.

The front tip 54 is provided at the front end of the nozzle pipe 52. The front tip 54 can be made of the same material as the nozzle tube 52, for example. The material of the front end 54 can be appropriately set. The tip 54 is formed with a recess 80 into which the tip of the nozzle tube 52 is inserted. The front end surface of the gas supply member 50 abuts against the bottom surface 80a of the recess 80. The outer peripheral surface of the tip end portion of the nozzle pipe 52 is airtightly joined to the side surface 80b of the recess 80. The front end portion of the gas supply member 50 is joined to the front head 54 in a liquid-tight and gas-tight manner by a joint portion 82. The joint 82 is made of, for example, an adhesive.

The tip 54 is formed with a discharge port 84, and the discharge port 84 communicates with the tip opening 50a of the gas supply member 50 to spray the mixed liquid G. The discharge port 84 is located on the axis of the gas supply member 50. The inner diameter (bore diameter) of the discharge port 84 is smaller than the inner diameter (bore diameter) of the distal end opening 50a of the gas supply member 50.

In fig. 2, the sheath member 56 includes a sheath tube 86 extending in one direction and a sheath hub 88 provided at a proximal end portion of the sheath tube 86. The sheath pipe 86 is positioned on the outer peripheral side of the nozzle pipe 52 and the outer peripheral side of the shaft portion 44. In other words, the shaft 44 is inserted into the sheath tube 86. The shaft 44 has a greater thickness than the sheath 86. The sheath tube 86 is movable (slidable) in the axial direction of the shaft portion 44.

Preferably, the sheath tube 86 is constructed of, for example, stainless steel. The material of the sheath 86 can be appropriately set. That is, the sheath tube 86 may be made of a metal material such as titanium, a titanium alloy, aluminum, an aluminum alloy, or an iron alloy (other than stainless steel), a hard resin material, or ceramics.

The outer diameter of the sheath tube 86 (outer diameter d of the nozzle 16) is set to be less than 5mm (see fig. 3). The outer diameter of the sheath tube 86 is preferably 4mm or less, more preferably 3mm or less. In this case, the sheath tube 86 can be inserted into the trocar 204 (see fig. 5) in the laparoscopic surgery. The sheath hub 88 is formed in a ring shape in a size that is easy to handle manually.

As shown in fig. 3, a gap 90 for discharging air from the distal end of the sheath tube 86 to the proximal end is formed inside the sheath tube 86. This prevents the abdominal pressure from becoming too high when the nozzle 16 is inserted into the abdominal cavity 206 (see fig. 5) in the laparoscopic surgery. A side hole (not shown) penetrating in the thickness direction of the sheath tube 86 may be provided on the distal end side of the sheath tube 86. Thus, the shield tube 86 is moved toward the distal end side of the nozzle 16, and the air exhaust function in the abdominal cavity 206 is not lost even when the spraying operation is performed in a state where the shield tube 86 is in close contact with the difference in level between the nozzle tube 52 and the distal tip 54.

In a state where the sheath member 56 is moved maximally toward the base end side of the nozzle 16 with respect to the nozzle pipe 52, the nozzle pipe 52 and the gas supply member 50 are exposed toward the tip end side of the nozzle 16 than the sheath pipe 86 and are bent in an arc shape. In a state where the sheath member 56 is moved maximally toward the tip end side of the nozzle 16 with respect to the nozzle pipe 52, the nozzle pipe 52 and the gas supply member 50 linearly extend along the shape of the sheath pipe 86.

Next, a method of using the medical application tool 10 configured as described above will be described. First, as shown in FIG. 1, the user fills the 1 st syringe outer tube 22 with the 1 st liquid M1 and fills the 2 nd syringe outer tube 24 with the 2 nd liquid M2. Then, the operation of the gas supply device 14 is performed to supply the gas to the nozzle 16. Thus, the gas introduced from the gas supply device 14 into the gas introduction hole 74 through the gas feed pipe 42 is introduced into the nozzle pipe 52 through the gas flow path 64 between the shaft 44 and the 1 st pipe 58. The gas introduced into the nozzle pipe 52 permeates the wall of the gas supply member 50, flows into the mixing chamber 51, and is sprayed from the discharge port 84.

Further, the user connects the distal end of the 1 st syringe outer tube 22 to the 1 st connection hole 70a and connects the distal end of the 2 nd syringe outer tube 24 to the 2 nd connection hole 72a. Then, as shown in fig. 5, in the case of laparoscopic surgery, the sheath member 56 is moved to the distal end side of the nozzle 16 so that the distal end portion of the nozzle 16 is straight, and is inserted into an abdominal cavity 206 (into a living body) through a trocar 204 provided in the skin 202 of the patient 200.

Next, the user moves the sheath member 56 toward the proximal end side of the nozzle 16, bends the distal end portion of the nozzle 16 into an arc shape, and directs the discharge port 84 toward the target site 208 (lesion site) in the abdominal cavity 206. In this case, the spray distance is set to be 2cm to 5cm from the discharge port 84. Next, the user presses the pressing portion 40 of the liquid supply portion 12. Thereby, the 1 st gasket 30 moves in the distal direction of the 1 st syringe outer cylinder 22, and the 2 nd gasket 32 moves in the distal direction of the 2 nd syringe outer cylinder 24. The 1 st liquid M1 pressed by the 1 st gasket 30 is introduced into the mixing chamber 51 through an inner cavity of the 1 st pipe 58 (a space between an outer peripheral surface of the 2 nd pipe 60 and an inner peripheral surface of the 1 st pipe 58). The 2 nd liquid M2 pressed by the 2 nd gasket 32 is introduced into the mixing chamber 51 through the inner cavity of the 2 nd tube 60.

In the mixing chamber 51, the 1 st liquid M1 and the 2 nd liquid M2 are mixed with a gas. At this time, a micro valve is generated in the liquid mixture G. The mixture G including the micro valve is sprayed (misted) from the discharge port 84 to the target site 208. The mixed liquid G sprayed from the discharge port 84 is gelled and applied to the target site 208 to form a physical partition wall. Thereby preventing adhesion at the injured part. The air in the abdominal cavity 206 is exhausted through the gap 90 inside the sheath tube 86.

After the application of the mixed liquid G is completed, the user moves the sheath member 56 toward the distal end side of the nozzle 16, and pulls out the trocar 204 from the nozzle 16 while straightening the distal end portion of the nozzle 16.

In this case, the medical application instrument 10 of the present embodiment has the following effects.

The liquid feeding portion 46 includes a double-walled pipe portion 62 in which the 2 nd pipe 60 is disposed inside the 1 st pipe 58. The double-walled pipe portion 62 extends from the base end portion of the gas supply member 50 toward the base end side of the nozzle 16. The liquid feeding portion 46 includes a 1 st portion 47a and a 2 nd portion 47b, wherein the 1 st portion 47a extends toward the tip end side of the nozzle 16 from the base end of the gas supply member 50, and the 2 nd portion 47b extends toward the base end side of the nozzle 16 from the base end of the gas supply member 50. The double-walled tube portion 62 of the 2 nd portion 47b is longer than the 1 st portion 47 a.

With this configuration, the outer diameter of the 2 nd portion 47b of the liquid feeding portion 46 can be made small. This enables the nozzle 16 to have a smaller diameter. Further, if the nozzle 16 is not reduced in diameter (if the nozzle diameter is the same as the conventional one), the diameter of the 1 st pipe 58 can be increased, and therefore at least one of the 1 st flow path cross-sectional area S1 and the 2 nd flow path cross-sectional area S2 is increased. This makes it possible to reduce the injection resistance of at least one of the 1 st liquid M1 and the 2 nd liquid M2 without increasing the nozzle diameter.

The double-walled pipe portion 62 has a coaxial portion 63 in which the 1 st pipe 58 and the 2 nd pipe 60 are coaxially arranged. The coaxial portion 63 extends from the distal end of the liquid feeding portion 46 to a position closer to the proximal end side of the nozzle 16 than the proximal end of the gas supply member 50.

With this configuration, the structure of the double-walled pipe portion 62 can be simplified.

The tip of the 1 st tube 58 is inserted into the inner cavity of the gas supply member 50. The 1 st tip opening 58a of the 1 st tube 58 and the 2 nd tip opening 60a of the 2 nd tube 60 are located at the tip of the double-walled tube portion 62.

With this configuration, the 1 st liquid M1 led out from the 1 st tip opening 58a and the 2 nd liquid M2 led out from the 2 nd tip opening 60a can be efficiently mixed in the mixing chamber 51.

The nozzle 16 includes a tubular shaft 44 for guiding the gas to the gas supply member 50, and a double-walled pipe 62 is disposed in the shaft 44.

With such a configuration, the outer diameter of the shaft 44 can be reduced. This can effectively reduce the diameter of the nozzle 16.

The double-walled tube portion 62 extends over the entire length of the shaft portion 44.

With this configuration, the outer diameter of the shaft 44 can be reduced over the entire length of the shaft 44.

A hole 66 for guiding the 2 nd pipe 60 to the outside of the 1 st pipe 58 is formed in the peripheral wall portion of the 1 st pipe 58 on the base end side of the shaft portion 44.

With such a configuration, the 1 st tube 58 and the 2 nd tube 60 can be arranged in parallel at the base end of the liquid feeding portion 46. Thus, the 1 st syringe outer tube 22 and the 2 nd syringe outer tube 24 can be arranged side by side.

A support member 48 for supporting the base end portions of the 1 st and 2 nd tubes 58, 60 is provided at the base end portion of the shaft portion 44. The support member 48 has: a 1 st connection part 70 to which the 1 st syringe outer tube 22 (1 st liquid supply part) for introducing the 1 st liquid M1 into the 1 st proximal end opening 58b of the 1 st tube 58 can be attached and detached; and a 2 nd connection part 72 to which the 2 nd syringe outer cylinder 24 (2 nd liquid supply part) for introducing the 2 nd liquid M2 into the 2 nd base end opening 60b of the 2 nd tube 60 can be attached and detached.

With such a configuration, the 1 st liquid M1 can be introduced into the 1 st pipe 58 and the 2 nd liquid M2 can be introduced into the 2 nd pipe 60 with a simple configuration.

The tip of the shaft 44 is located closer to the base end of the nozzle 16 than the base end of the gas supply member 50.

According to such a configuration, the shaft 44 and the gas supply member 50 do not overlap in the radial direction, and therefore the nozzle 16 can be effectively reduced in diameter.

The nozzle 16 includes a sheath tube 86 disposed on an outer peripheral side of the shaft 44, and the shaft 44 has a thickness larger than that of the sheath tube 86.

With such a configuration, the rigidity of the shaft portion 44 can be improved while reducing the diameter of the nozzle 16.

The gas supply member 50 is formed of a hydrophobic filter.

With such a configuration, the 1 st liquid M1 and the 2 nd liquid M2 can be prevented from leaking from the mixing chamber 51 to the outside of the gas supply member 50.

The gas supply member 50 is formed in a tubular shape, and an outlet 84 for spraying the mixture G led out from the distal end opening 50a of the gas supply member 50 is formed at the distal end of the nozzle 16.

With this configuration, the mixed liquid G obtained by mixing the 1 st liquid M1 and the 2 nd liquid M2 with the gas in the mixing chamber 51 can be efficiently sprayed from the discharge port 84.

In the double-walled tube part 62, the 1 st flow path cross-sectional area S1 of the 1 st tube 58 is larger than the 2 nd flow path cross-sectional area S2 of the 2 nd tube 60.

With such a configuration, when the 1 st liquid M1 has a higher viscosity than the 2 nd liquid M2, the 1 st liquid M1 and the 2 nd liquid M2 can be smoothly introduced into the mixing chamber 51.

The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

The above embodiments are summarized as follows.

The embodiment described above discloses a medical application device (10) including a nozzle (16) for spraying a mixed liquid (G) obtained by mixing a 1 st liquid (M1) and a 2 nd liquid (M2) into a living body (206), the nozzle including: a liquid feeding unit (46) including a 1 st tube (58) through which the 1 st liquid flows and a 2 nd tube (60) through which the 2 nd liquid flows; and a gas supply member (50) that is provided at a distal end portion of the liquid supply portion, forms a mixing chamber (51) for mixing the 1 st liquid and the 2 nd liquid, and supplies a gas into the mixing chamber, wherein the liquid supply portion includes a double-walled pipe portion (62) in which the 2 nd pipe is disposed inside the 1 st pipe, the double-walled pipe portion extending from a proximal end portion of the gas supply member toward a proximal end side of the nozzle, and the liquid supply portion includes: a 1 st portion (47 a) extending toward the tip end side of the nozzle than the base end of the gas supply member; and a 2 nd portion (47 b) extending toward a base end side of the nozzle than a base end of the gas supply member, the double-walled tube portion in the 2 nd portion being longer than the 1 st portion.

In the medical applicator, the double-layer tube part may have a coaxial part (63) in which the 1 st tube and the 2 nd tube are coaxially arranged, and the coaxial part may extend from a distal end of the liquid feeding part to a proximal end side of the nozzle with respect to a proximal end of the gas supply member.

In the medical applicator, the distal end portion of the 1 st tube may be inserted into the lumen of the gas supply member, and the 1 st distal end opening (58 a) of the 1 st tube and the 2 nd distal end opening (60 a) of the 2 nd tube may be positioned at the distal end of the double-walled tube portion.

In the medical applicator, the nozzle may include a tubular shaft portion (44) for guiding the gas to the gas supply member, and the double-walled tube portion may be disposed in the shaft portion.

In the medical application instrument, the double-walled tube may extend over the entire length of the shaft portion.

In the medical applicator, a hole (66) for guiding the 2 nd tube out of the 1 st tube may be formed in a peripheral wall portion of the 1 st tube on a proximal end side of the shaft portion.

In the medical applicator, a support member (48) for supporting the proximal end portions of the 1 st and 2 nd tubes may be provided at the proximal end portion of the shaft portion, and the support member may include: a 1 st connection part (70) to which a 1 st liquid supply part (22) for introducing the 1 st liquid into a 1 st base end opening (58 b) of the 1 st tube can be attached and detached; and a 2 nd connection part (72) to which a 2 nd liquid supply part (24) for introducing the 2 nd liquid into the 2 nd base end opening (60 b) of the 2 nd tube can be attached and detached.

In the medical applicator, a distal end of the shaft may be located closer to a proximal end side of the nozzle than a proximal end of the gas supply member.

In the medical applicator, the nozzle may have a sheath tube (86) disposed on an outer peripheral side of the shaft portion, and the thickness of the shaft portion may be larger than that of the sheath tube.

In the medical applicator, the gas supply member may be formed of a hydrophobic filter.

In the medical applicator, the gas supply member may be formed in a tubular shape, and a discharge port (84) for spraying the mixed liquid led out from a distal end opening (50 a) of the gas supply member may be formed at a distal end of the nozzle.

In the medical applicator, the 1 st tube may have a 1 st flow path cross-sectional area (S1) larger than a 2 nd flow path cross-sectional area (S2) of the 2 nd tube in the double-walled tube portion.

Claims (12)

1. A coating device for medical use, comprising a coating body,

which comprises a nozzle for spraying a mixed solution obtained by mixing a solution 1 and a solution 2 into a living body,

the nozzle has:

a liquid feeding unit including a 1 st tube through which the 1 st liquid flows and a 2 nd tube through which the 2 nd liquid flows; and

a gas supply member provided at a distal end portion of the liquid feeding portion, forming a mixing chamber for mixing the 1 st liquid and the 2 nd liquid, and supplying a gas into the mixing chamber,

the liquid feeding part comprises a double-layer pipe part formed by arranging the 2 nd pipe on the inner side of the 1 st pipe,

the double-walled pipe portion extends from a base end portion of the gas supply member toward a base end side of the nozzle,

the liquid feeding section has a 1 st portion and a 2 nd portion, wherein the 1 st portion extends toward the tip end of the nozzle from the base end of the gas supply member, and the 2 nd portion extends toward the base end of the nozzle from the base end of the gas supply member,

the double-walled tube portion in the 2 nd section is longer than the 1 st section.

2. The medical coating device according to claim 1,

the double-walled pipe section has a coaxial section in which the 1 st pipe and the 2 nd pipe are coaxially arranged,

the coaxial portion extends from a distal end of the liquid feeding portion to a proximal end side of the nozzle with respect to a proximal end of the gas supply member.

3. The medical coating device according to claim 1 or 2,

the tip of the 1 st pipe is inserted into the lumen of the gas supply member,

the 1 st front end opening of the 1 st pipe and the 2 nd front end opening of the 2 nd pipe are positioned at the front end of the double-layer pipe part.

4. The medical coating device according to any one of claims 1 to 3,

the nozzle includes a tubular shaft portion for guiding the gas to the gas supply member,

the double-walled tube portion is disposed within the shaft portion.

5. The medical coating device according to claim 4,

the double-walled tube portion extends over the entire length of the shaft portion.

6. The medical coating device according to claim 5,

a hole portion for guiding the 2 nd tube out of the 1 st tube is formed in a peripheral wall portion of the 1 st tube on a base end side of the shaft portion.

7. The medical coating device according to claim 6,

a support member for supporting the base end portions of the 1 st and 2 nd tubes is provided at the base end portion of the shaft portion,

the support member has:

a 1 st connection part to which a 1 st liquid supply part for introducing the 1 st liquid into a 1 st base end opening of the 1 st tube is attachable and detachable; and

and a 2 nd connection part to which a 2 nd liquid supply part for introducing the 2 nd liquid into the 2 nd base end opening of the 2 nd tube is attachable and detachable.

8. The medical coating device according to any one of claims 4 to 7,

the tip of the shaft portion is located closer to the base end side of the nozzle than the base end of the gas supply member.

9. The medical coating device according to any one of claims 4 to 8,

the nozzle has a sheath pipe disposed on an outer peripheral side of the shaft portion,

the shaft portion has a wall thickness greater than that of the sheath tube.

10. The medical coating device according to any one of claims 1 to 9,

the gas supply member is formed of a hydrophobic filter.

11. The medical coating device according to any one of claims 1 to 10,

the gas supply member is formed in a tubular shape,

a discharge port for spraying the mixed liquid led out from the distal end opening of the gas supply member is formed at the distal end of the nozzle.

12. The medical coating device according to any one of claims 1 to 11,

in the double-layer pipe portion, a 1 st flow path sectional area of the 1 st pipe is larger than a 2 nd flow path sectional area of the 2 nd pipe.

Images