JP2017153522A - Liquid injection apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce leakage from a branching portion of a double pipe.SOLUTION: A liquid injection apparatus comprises: a supply pipe for injecting a liquid; and a suction flow passage member for sucking the liquid. A portion of the supply pipe forms a double pipe in conjunction with a portion of the suction flow passage member. An inner pipe member, which includes the inner pipe of the double pipe of the supply pipe and the suction flow passage member, comprises: an inner pipe portion forming the double pipe; and a branching portion connected to the inner pipe portion and protruding through a hole opening in a wall of an outer pipe member which includes the outer pipe of the double pipe. The outer pipe member comprises a retaining portion made from an elastic member which protrudes from the periphery of the hole to the outside of the outer pipe member and seals the outer peripheral surface of the branching portion.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a liquid ejecting apparatus.

  A liquid ejecting apparatus is known as a surgical apparatus for excising a living tissue using a liquid. The liquid ejecting apparatus disclosed in Patent Document 1 includes a suction channel member for sucking the liquid and the excised tissue in addition to a supply pipe (ejection pipe) for ejecting the liquid. The supply pipe is a part that forms a double pipe with the suction flow path member as an outer pipe (hereinafter referred to as an inner pipe part) and a suction flow path member that does not form a double pipe, and the suction flow path member And a portion branched from (hereinafter referred to as a branched portion).

JP2015-58169A

  In order to realize the branching as described above, a hole is made in the wall of the suction flow path member, and the supply pipe penetrates the hole. For this reason, there is a risk of fluid leaking from the hole.

  The above-mentioned contents were common also in the case of forming a double pipe having the supply pipe as an outer pipe and the suction flow path member as an inner pipe. In addition, the above contents are common to the apparatus for the operation using the liquid. Examples of such a device include a surgical device using ultrasonic crushing.

  Based on the above-described prior art, the present invention has a problem of reducing leakage in a double pipe.

  SUMMARY An advantage of some aspects of the invention is to solve the above-described problems, and the invention can be implemented as the following forms.

  One aspect of the present invention includes a supply pipe for ejecting a liquid; a suction flow path member for sucking the liquid; a part of the supply pipe includes a part of the suction flow path member; An inner pipe member that is a member including the inner pipe of the double pipe among the supply pipe and the suction flow path member, and an inner pipe portion that forms the double pipe; A branch portion that is connected to the inner tube portion and protrudes from a hole opened in the wall of the outer tube member that is a member including the outer tube of the double tube; and the outer tube member surrounds the hole It is an elastic member which protruded toward the outside of the outer tube member from the liquid pipe and has a holding part for sealing the outer peripheral surface of the branch part. According to this embodiment, leakage in the double pipe is reduced.

  In the above aspect, the inner tube member includes a portion bent at a predetermined angle with respect to the branch portion; an angle formed by the holding portion and the outer tube member may be substantially equal to the predetermined angle. According to this aspect, the angle of the inner tube member relative to the outer tube member can be stabilized by the holding by the holding portion.

  In the above aspect, the inner tube member is formed of a conductive member; at least a part thereof may include an insulating member disposed between the branch portion and the holding portion. According to this embodiment, the occurrence of problems due to the electricity as noise flowing into the inner tube member is reduced.

  In the above embodiment, the liquid may be ejected intermittently. According to this embodiment, an operation can be performed using intermittent liquid ejection.

  The present invention can be realized in various forms other than the above. For example, it can be realized in the form of a hand piece as a part of the liquid ejecting apparatus.

1 is a schematic configuration of a liquid ejection device. The perspective view of a handpiece. The side view of a handpiece. Sectional drawing of a handpiece. Sectional drawing which expands and shows the drive part vicinity. Sectional drawing which expanded the diaphragm vicinity. The expanded sectional view of the site | part which a supply pipe and a suction flow path member branch. The perspective view which shows the handpiece of the state which removed the suction pipe from the housing | casing. Sectional drawing of a suction tube. The enlarged view of the connection part 10 of FIG. The figure which looked at the connection part 10 from the plus side of the X2 direction to the minus side. The figure for demonstrating fitting with an internal peripheral surface and the insertion part of a suction tube. FIG. 13 is an enlarged view near the contact portion 13B shown in FIG. The external view of the handpiece in a disassembled state. The figure which shows the state which removed the 2nd housing from the 1st housing. The perspective view which shows the 2nd housing in the convex part vicinity. The perspective view which shows the 2nd housing in the convex part vicinity. The perspective view of the 1st housing in the ring member vicinity. The figure which shows the state which removed the suction flow path member from the 1st housing. Sectional drawing of a suction tube and the handpiece in a disassembled state. Sectional drawing of the handpiece in the state with which the suction pipe was mounted | worn. Sectional drawing of the suction tube and handpiece in a decomposition | disassembly state (modification 1). Sectional drawing of the suction tube and handpiece in a mounting state (modification 1). The figure which looked at the connection part from the plus side of the X2 direction to the minus side (modification 2). Sectional drawing of the handpiece in the connection part vicinity (modification 2).

  FIG. 1 schematically shows the configuration of the surgical apparatus 20. The surgical device 20 is a medical device for realizing a surgery using a liquid. The surgical apparatus 20 has a function of excising the affected part (living tissue) by ejecting liquid to the affected part, and a function of sucking the ejected liquid and the excised living tissue. For this reason, the surgical apparatus 20 is a liquid ejecting apparatus and a suction apparatus.

  The surgical device 20 includes a control device 30, an actuator cable 31, a pump cable 32, a foot switch 35, a suction device 40, a suction tube 41, a liquid supply device 50, and a surgical handpiece 200 (hereinafter referred to as “surgical handpiece 200”). And handpiece 200).

  The liquid supply device 50 includes a water supply bag 51, a spike needle 52, first to fifth connectors 53a to 53e, first to fourth water supply tubes 54a to 54d, a pump tube 55, a blockage detection mechanism 56, A filter 57 and a tube pump 60 are provided. The handpiece 200 includes a supply pipe 205 and a suction pipe 400.

  The water supply bag 51 is made of a transparent synthetic resin, and is filled with a liquid (specifically, physiological saline). In addition, in this application, even if it fills with liquids other than water, it calls the water supply bag 51. FIG. The spike needle 52 is connected to the first water supply tube 54a via the first connector 53a. When the spike needle 52 is stabbed into the water supply bag 51, the liquid filled in the water supply bag 51 can be supplied to the first water supply tube 54a.

  The first water supply tube 54a is connected to the pump tube 55 via the second connector 53b. The pump tube 55 is connected to the second water supply tube 54b via the third connector 53c. The tube pump 60 sandwiches the pump tube 55 between the stator 60a and the rotor 60b. The tube pump 60 handles the pump tube 55 by rotating a plurality of rollers on the rotor by rotation of a built-in motor (supply motor 62). By being handled in this way, the liquid in the pump tube 55 is sent out from the first water supply tube 54a side to the second water supply tube 54b side. Note that rotating the supply motor 62 is referred to as “driving the tube pump 60”.

  The blockage detection mechanism 56 detects the blockage of the flow paths in the second to fourth water supply tubes 54b to 54d and the handpiece 200 by measuring the pressure in the second water supply tube 54b. When detecting the blockage, the blockage detection mechanism 56 inputs the detection result to the control device 30.

  The second water supply tube 54b is connected to the third water supply tube 54c via the fourth connector 53d. A filter 57 is connected to the third water supply tube 54c. The filter 57 collects foreign matters contained in the liquid.

  The third water supply tube 54c is connected to the fourth water supply tube 54d through the fifth connector 53e. The fourth water supply tube 54d is connected to the handpiece 200. The liquid supplied to the handpiece 200 through the fourth water supply tube 54d is intermittently ejected from the nozzle 207 provided at the tip of the supply pipe 205 by the drive of the drive unit 300 (FIGS. 4 and 5). In this way, the liquid is intermittently ejected, so that the resecting capability can be secured with a small flow rate. Thus, the supply tube 205 is a tube for supplying a liquid for excising the living tissue to the excision target site. Since the supply pipe 205 is for injecting liquid, it is also called an injection pipe. The supply pipe 205 can also be said to be a pipe through which a liquid used for surgery flows.

  The suction tube 41 is connected to the handpiece 200. The suction device 40 sucks the inside of the suction tube 400 through the suction tube 41. By this suction, liquid near the tip of the suction tube 400, a cut piece, and the like are sucked. As described above, the suction tube 400 is a tube through which a liquid used for surgery flows, like the supply tube 205.

  The control device 30 includes a CPU (Central Processing Unit) and a storage medium. A program for controlling the tube pump 60 and the piezoelectric element 360 (see FIG. 5) is stored in the storage medium. The control device 30 transmits the first drive signal via the actuator cable 31 and the second drive via the pump cable 32 while the foot switch 35 is depressed by the CPU executing this program. Send a signal. In the present embodiment, the first drive signal has a periodicity of 400 Hz and drives the drive unit 300. The second drive signal drives the tube pump 60. Therefore, the liquid is intermittently ejected while the user steps on the foot switch 35, and the liquid ejection stops while the user does not step on the foot switch 35.

  FIG. 2 shows a perspective view of the handpiece 200. FIG. 3 shows a side view of the handpiece 200. The handpiece 200 includes a supply pipe 205, a casing 210, screws 221, 222, and 223, a suction pipe 400, and a suction force adjustment mechanism 500.

  The casing 210 is a member that is gripped by the user. The housing 210 is formed by coupling the first housing 210a and the second housing 210b. Since the supply pipe 205 is made of metal, it is conductive. The casing 210 and the suction tube 400 are made of hard resin.

  As shown in FIGS. 2 and 3, two orthogonal coordinate systems based on the handpiece 200 are defined. The first is the X1-Y-Z1 coordinate system. The second is the X2-Y-Z2 coordinate system. The Y direction common to the two coordinate systems is a direction orthogonal to the boundary line between the first housing 210a and the second housing 210b, and the direction from the first housing 210a to the second housing 210b is a positive direction. . The boundary line here is a line appearing on the surface of the housing 210 as shown in FIG. However, in the definition of the Y direction, the boundary line near the connecting portion 10 is excluded. The connection unit 10 will be described later with reference to FIG.

  The X1 direction is a direction parallel to a predetermined straight line included in the boundary line, and the direction toward the opening end of the suction tube 400 is a positive direction. The predetermined straight line is a straight line appearing on both sides of the suction force adjusting mechanism 500. The Z1 direction is defined by the right hand system from the X1 direction and the Y direction.

  The X2 direction is the longitudinal direction of the suction tube 400, and the direction of the suction tube 400 toward the open end is a positive direction. The Z2 direction is defined by the right hand system from the X2 direction and the Y direction. The angle between the X1 direction and the X2 direction is 20 degrees in the present embodiment.

  The second housing 210b is fixed to the first housing 210a by fastening screws 221, 222, and 223. Of the screws 221, 222, and 223, the screw 223 is positioned closest to the minus side in the X1 direction. The position of the screw 223 is disposed in the vicinity of the end of the housing 210 on the minus side in the X1 direction. For this reason, the second housing 210b is firmly fixed to the first housing 210a in the vicinity of the end of the housing 210 on the minus side in the X1 direction.

  Among the screws 221, 222, and 223, the screw 221 is positioned closest to the X1 direction plus side. The position of the screw 221 is closer to the minus side in the X1 direction than the end of the housing 210 on the plus side in the X1 direction, that is, the vicinity of the connecting portion 10. This is because the housing 210 is designed to be narrower on the plus side in the X1 direction than the screw 221. However, the second housing 210b is firmly fixed to the first housing 210a on the plus side in the X1 direction from the screw 221 (described later with reference to FIGS. 14 and 15).

  FIG. 4 shows a cross-sectional view of the handpiece 200. Inside the casing 210, screw holes 221a, 222a, 223a, an inlet channel 241, an insulating member 270 (described later with reference to FIG. 6), and a driving unit 300 are provided.

  The surface shown as a cross section of the housing 210 in FIG. 4 is also a mating surface of the first housing 210a. The mating surface of the first housing 210a is a surface orthogonal to the Y direction and is a surface that comes into contact with the second housing 210b when assembled as the housing 210. However, a region shown as a ring member 280 (described later) shown in the enlarged view surrounded by a circle is not a mating surface but a cut surface of the ring member 280. The supply pipe 205 and the suction pipe 400 pass through the ring member 280.

  The fourth water supply tube 54d is bent in a U shape inside the casing 210 and connected to the inlet channel 241. The inlet channel 241 communicates with the supply pipe 205 via the liquid chamber 240 (see FIG. 6).

  The channel diameter of the inlet channel 241 is smaller than the channel diameter of the supply pipe 205. For this reason, even if the pressure in the liquid chamber 240 fluctuates (described later), the liquid in the liquid chamber 240 is prevented from flowing back into the inlet channel 241.

  The housing 210 includes a ring member 280. When the suction tube 400 is attached, the insertion portion 405 that is a part of the suction tube 400 is fitted to the ring member 280 (described later with reference to FIGS. 12 and 13), and the flange 410 that is a part of the suction tube 400 is It implement | achieves by contacting the ring member 280 of the housing 210a. The flow path in the attached suction pipe 400 communicates with the suction flow path member 230. The suction channel member 230 is softer than the supply pipe 205 and is made of a soft resin. The suction flow path member 230 is connected to the suction tube 41 via the suction force adjustment mechanism 500.

  The suction force adjusting mechanism 500 is provided with a suction channel member 510 that connects the suction channel member 230 and the suction tube 41, and a hole 522 that communicates with the channel in the suction channel member 510. The user can adjust the suction force by the suction pipe 400 using the hole 522. Specifically, if the area where the hole 522 is opened is reduced, the flow rate of air flowing in from the hole 522 is also reduced, so that the flow rate of fluid (air, liquid, etc.) sucked through the suction pipe 400 is reduced. growing. That is, the suction force by the suction pipe 400 is increased. On the contrary, if the area where the hole 522 is opened is increased, the flow rate of the air flowing from the hole 522 is also increased, so that the suction force by the suction pipe 400 is reduced. Usually, the user adjusts the open area of the hole 522 by adjusting the area where the hole 522 is closed by the thumb. In a state where the hole 522 is not covered at all, the shape of the hole 522 is designed so that the suction force by the suction pipe 400 becomes minute or no suction force acts. In this embodiment, although the flow area of the suction pipe 400 is larger than the opening area of the hole 522, the flow resistance of the suction pipe 400 is reduced by sufficiently increasing the length of the suction pipe 400. Is bigger than. In this way, when the hole 522 is not covered at all, the suction force by the suction tube 400 can be made minute.

The screw holes 221a, 222a, and 223a are provided in the first housing 210a. Screws 221, 222, 223 are screwed into the screw holes 221a, 222a, 223a. The screw 222 passes through a hole 255 (see FIG. 5) provided in the flow path connecting member 250 of the driving unit 300 and is inserted into the screw hole 222a.

  FIG. 5 is an enlarged sectional view showing the vicinity of the driving unit 300. The drive unit 300 includes a flow path connecting member 250, a diaphragm 260, a cylindrical member 351, a fixing member 353, a piezoelectric element 360, and a piston 362.

  The piezoelectric element 360 is a stacked piezoelectric element. The piezoelectric element 360 is disposed in the cylindrical member 351 so that the extending and contracting direction is along the X1 direction.

  The fixing member 353 is fixed to one end of the cylindrical member 351. Specifically, the fixing member 353 is fixed to one end of the cylindrical member 351 by fastening the male screw 353 a provided on the outer periphery of the fixing member 353 to the female screw 351 b provided on the inner periphery of the cylindrical member 351. Has been.

  The piezoelectric element 360 is fixed to the fixing member 353 with an adhesive. The first cable 31 a and the second cable 31 b that constitute the actuator cable 31 pass through a through hole provided in the fixing member 353 and are electrically connected to the piezoelectric element 360.

  The material of the diaphragm 260 is a metal, specifically stainless steel, and more specifically SUS304 or SUS316L. The diaphragm 260 is formed thicker (for example, 300 μm) in order to perform preloading (preloading) of the piezoelectric element 360. The diaphragm 260 is disposed so as to cover the other end of the cylindrical member 351, and is fixed to the cylindrical member 351 by welding.

  The piston 362 is fixed to one end of the piezoelectric element 360 with an adhesive and is disposed so as to contact the diaphragm 260. The piston 362 has a shape in which cylinders having different diameters are stacked as concentric circles. The smaller diameter is in contact with the diaphragm 260. For this reason, the diaphragm 260 is not pushed toward the end, and a large force does not act on the welded portion. The piston 362 and the diaphragm 260 are not fixed by an adhesive or the like, but are only in contact with each other.

  On the outer periphery of the cylindrical member 351, a male screw 351a is provided. The cylindrical member 351 is fixed to the flow path connecting member 250 by tightening the male screw 351 a to the female screw 253 provided in the flow path connecting member 250.

  The piezoelectric element 360 expands and contracts in response to a drive signal input via the actuator cable 31. When the piezoelectric element 360 expands and contracts, the piston 362 vibrates in the longitudinal direction (X1 direction) of the piezoelectric element 360. When the piston 362 vibrates, the diaphragm 260 is deformed following the vibration. Note that expanding and contracting the piezoelectric element 360 by the drive signal is referred to as driving the drive unit 300.

  FIG. 6 shows an enlarged cross section near the diaphragm 260. The channel connection member 250 is provided with a recess 244. The recess 244 is a thin and circularly recessed portion in the flow path connecting member 250. The liquid chamber 240 is formed by covering the recess 244 with the diaphragm 260. The liquid chamber 240 formed in this way can communicate with the supply pipe 205 for ejecting liquid.

  When the diaphragm 260 is deformed, the volume of the liquid chamber 240 changes. Due to this variation, the pressure of the liquid filled in the liquid chamber 240 varies. When the pressure in the liquid chamber 240 decreases, the liquid flows into the liquid chamber 240 from the inlet channel 241. When the pressure in the liquid chamber 240 increases, the liquid flows out from the liquid chamber 240 to the supply pipe 205. The liquid flows in such a direction because the flow path diameter of the inlet flow path 241 is smaller than the flow path diameter of the supply pipe 205 as described above.

  The liquid flowing out to the supply pipe 205 is ejected from the tip of the supply pipe 205. Since the pressure in the liquid chamber 240 rises intermittently, the liquid is ejected from the supply pipe 205 intermittently.

  FIG. 7 is an enlarged cross-sectional view of a portion where the supply pipe 205 and the suction flow path member 230 are branched. A hole 233 b is opened in the wall of the suction flow path member 230. The supply pipe 205 is disposed so as to penetrate the hole 233b. With this arrangement, a part of the supply pipe 205 forms a double pipe with a part of the suction flow path member 230. Part of the supply pipe 205 that constitutes the inner pipe of the double pipe with the suction flow path member 230, that is, the part from the X1 direction plus side of the hole 233b to the tip of the suction flow path member on the X2 direction plus side Is called the inner tube portion 205b1. A portion of the supply pipe 205 that is on the minus side in the X1 direction from the hole 233b, that is, a portion branched from the suction flow path member 230 is referred to as a branched portion 205a1. Since the supply pipe 205 includes the inner pipe portion 205b1, it is also referred to as an inner pipe member.

  The supply pipe 205 can also be divided into a rear end side 205a2 and a front end side 205b2. The rear end side 205a2 is a part extending in the X1 direction in the supply pipe 205. The distal end side 205b2 is a portion extending in the X2 direction in the supply pipe 205. The front end side 205b2 is located on the plus side in the X1 direction and on the plus side in the X2 direction with respect to the rear end side 205a2.

  Since the rear end side 205a2 passes through the hole 233b, the boundary between the rear end side 205a2 and the front end side 205b2 is disposed in the front end side 232. For this reason, the supply pipe 205 has a portion that is the inner pipe portion 205b1 and the rear end side 205a2.

  The suction flow path member 230 can also be divided into a rear end side 231 and a front end side 232. The distal end side 232 is a part extending in the X2 direction. The rear end side 231 is a part extending in the X1 direction. The front end side 232 is located on the X1 direction plus side and the X2 direction plus side with respect to the rear end side 231. A part of the suction channel member 230 forms a double tube with the inner tube portion 205b1, and is also referred to as an outer tube member.

  The suction channel member 230 includes a holding part 233. The holding part 233 is a tubular member branched from the main part that functions as the flow path of the suction flow path member 230. The wall of the holding portion 233 is connected to the distal end side 232 so as to surround the hole 233b. Specifically, the holding part 233 is integrally formed with the suction flow path member 230 by resin molding. Since the suction flow path member 230 and the holding portion 233 are made of a soft resin, the holding portion 233 is an elastic member. The holding portion 233 extends straight from the periphery of the hole 233b toward the X1 direction minus side, and an open end 233a is provided as an end portion on the X1 direction minus side.

  An insulating member 270 is disposed between the branch portion 205a1 and the holding portion 233. Since the insulating member 270 is made of high-density polyethylene, it is insulative. The insulating member 270 is a tubular member that forms a triple tube structure together with the holding portion 233 and the branch portion 205a1. The insulating member 270 corresponds to the second tube from the outside (that is, the second tube from the inside) in the triple tube.

  The insulating member 270 is disposed in the holding portion 233 by being inserted from the open end 233 a of the holding portion 233. The insulating member 270 is longer than the holding part 233. Therefore, a part of the insulating member 270 protrudes further to the minus side in the X1 direction than the holding portion 233. The end portion 271 on the minus side in the X1 direction of the insulating member 270 is located on the minus side in the X1 direction with respect to the portion intersecting the fourth water supply tube 54d. The end portion 271 has a longer distance from the housing 210 than a portion such as the open end 233a. For this reason, the influence of electricity as noise on the piezoelectric element 360 through the casing 210 and the supply pipe 205 is suppressed.

  The branch portion 205a1 and the insulating member 270 are in an interference fit dimension relationship. Similarly, the insulating member 270 and the holding portion 233 have an interference fit dimension relationship. The branch portion 205a1 is held by the holding portion 233 via the insulating member 270. That is, the holding unit 233 is a member for holding the supply pipe 205. Note that the holding portion 233 is sufficiently lower in rigidity than the insulating member 270. Therefore, when the insulating member 270 is inserted, the holding portion 233 is deformed more greatly than the insulating member 270. The deformation in the radial direction of the holding portion 233 is about 20% of the wall thickness of the holding portion 233.

  As described above, since the branch portion 205a1 and the insulating member 270 are in a dimensional relationship of an interference fit, the space between the branch portion 205a1 and the insulating member 270 is sealed. Similarly, since the insulating member 270 and the holding portion 233 are in a close-fitting dimensional relationship, the insulating member 270 and the holding portion 233 are sealed. Therefore, the fluid hardly leaks from the gap between the hole 233b and the rear end side 205a2.

  As described above, the holding portion 233 holds the branch portion 205a1, so that the holding portion 233 and the branch portion 205a1 are maintained in a substantially parallel state. On the other hand, the angle θ1 formed by the front end side 232 and the holding portion 233 is substantially equal to the angle θ2 formed by the rear end side 205a2 and the front end side 205b2. For this reason, the front end side 205b2 is held substantially parallel to the front end side 232. In the present embodiment, the angle θ1 and the angle θ2 are designed to be 160 degrees.

  As described above, the branch portion 205a1 is held by the holding portion 233, which is an elastic member, so that the vibration of the supply pipe 205 is absorbed by the holding portion 233. The supply pipe 205 vibrates due to driving of the piezoelectric element 360 and a force received from the nozzle 207.

  The screw hole 221a is disposed on the minus side of the hole 233b in the X1 direction, and is disposed between the branch portion 205a1 and the suction flow path member 230 in the Z1 direction. For this reason, the casing 210 is designed to be narrower in a range in which the distal end side 232 can be accommodated on the plus side in the X2 direction than the inner tube portion 205b1.

  FIG. 8 is a perspective view showing the handpiece 200 with the suction tube 400 removed from the housing 210. Hereinafter, this state is referred to as a disassembled state. On the other hand, as shown in FIG. 2 and the like, a state in which the suction tube 400 is attached is referred to as an attached state. The suction tube 400 is formed so that it can be attached to and detached from the housing 210 (can be removed or attached) by the user manually. The user may use the handpiece 200 in a disassembled state depending on the state of the surgical site and the use state of the apparatus. The surgical device 20 is not used as a suction device in the disassembled state. The structure for attaching and detaching will be described below.

  FIG. 9 is a cross-sectional view of the suction tube 400. The suction tube 400 includes an insertion portion 405, a flange 410, and a main portion 420. As described with reference to FIG. 4, the insertion portion 405 is a portion that is inserted into the ring member 280. The distal end surface of the insertion portion 405 is chamfered as shown in FIG. This chamfering facilitates the operation of inserting the insertion portion 405 into the ring member 280. The flange 410 is a part having an outer diameter larger than that of the insertion portion 405.

  FIG. 10 is an enlarged view of the connecting portion 10 of FIG. FIG. 11 is a view of the connecting portion 10 as viewed from the plus side in the X2 direction to the minus side. The outlines of the first housing 210a and the second housing 210b are substantially symmetrical with each other. However, in the connection part 10, the outlines of the first housing 210a and the second housing 210b are asymmetric.

  The first housing 210a includes the ring member 280 described with reference to FIG. The ring member 280 includes a front end surface 281, an R portion 282, an arc surface 283, two planes 284, and a curled surface 285.

  The front end surface 281 is a plane parallel to the YZ2 plane, and is the portion that is located most on the X2 direction plus side in the ring member 280. The R portion 282 is an R portion that connects the front end surface 281 and the outer peripheral surface of the ring member 280.

  The arc surface 283, the two flat surfaces 284, and the rounded surface 285 form an inner peripheral surface 288 of the through hole 289. The arc surface 283 is a portion where the shape projected onto the YZ2 plane is an arc. The curled surface 285 is a portion that is curled radially outward from the arc surface 283 so that the ring member 280 is thin. The two planes 284 are planes that connect the arcuate surface 283 and the curved surface 285.

  The second housing 210b includes a convex portion 290. The convex portion 290 is disposed so as to fill a portion that is curled by the curled surface 285. The convex portion 290 will be described in detail with reference to FIGS.

  FIG. 12 is a view for explaining the fitting between the inner peripheral surface 288 and the insertion portion 405 of the suction tube 400. FIG. 13 is an enlarged view of the vicinity of the contact portion 13B shown in FIG. In the description of FIGS. 12 and 13, the inner peripheral surface 288, the insertion portion 405, and the convex portion 290 are handled as two-dimensional lines projected on the YZ2 plane. 12 and 13 show only the outer peripheral surface of the insertion portion 405 and the convex portion 290. FIG.

  12 and 13 do not accurately show the shape in the mounted state of each of the insertion portion 405 and the inner peripheral surface 288, but show the shape in the disassembled state. As will be described later, when the transition is made from the disassembled state to the mounted state, the insertion portion 405 and the inner peripheral surface 288 are elastically deformed, so that the shapes differ between the mounted state and the disassembled state.

  12 and 13, the insertion portion 405 is arranged so that the point K overlaps the inner peripheral surface 288 and the symmetry axis O overlaps. The point K is a point defined with respect to each of the insertion portion 405 and the inner peripheral surface 288 as a point located on the most minus side in the Y direction on the YZ2 plane. The symmetry axis O is a straight line parallel to the Y direction, and is a straight line passing through the point K, the arc surface 283 and the center of the insertion portion 405.

  As shown in FIG. 13, the arc surface 283 has an inner diameter d3. The outer diameter of the insertion portion 405 is an outer diameter D2 as shown in FIGS. The virtual inscribed circle V has a diameter D1. The virtual inscribed circle V is a virtual circle that passes through the point K and touches each of the two planes 284. The plane 284 corresponds to a circular chord including the arc surface 283. Therefore, the inner diameter d3 is larger than the diameter D1. The outer diameter D2 is designed to be smaller than the inner diameter d3 and larger than the diameter D1. For this reason, as shown in FIGS. 12 and 13, a part of the plane 284 overlaps with the insertion portion 405. The overlapping parts are indicated by hatching in FIG. Therefore, when the insertion portion 405 is inserted into the inner peripheral surface 288, at least the portions indicated by hatching in the insertion portion 405 and the inner peripheral surface 288 are elastically deformed. The insertion portion 405 receives a force in the Y direction minus direction as a resultant force from the two planes 284. This resultant force acts near the portion 13A.

  In this way, when the insertion portion 405 is inserted into the through hole 289, the insertion portion 405 receives a surface pressure in the vicinity of the portions 13A, 13B, and 13C from the inner peripheral surface 288. The insertion portion 405 is held on the inner peripheral surface 288 by the frictional force accompanying the surface pressure.

  As described above, the virtual inscribed circle V is in contact with the inner peripheral surface 288 at three points. Since the shape of the circle is determined when three points are determined, the position and diameter D1 of the virtual inscribed circle V are stable even if dimensional tolerances are taken into consideration. Unlike this embodiment, if the virtual inscribed circle V is designed to be in contact with the inner peripheral surface 288 at 4 points or more, the contact points may be reduced in an actual product in consideration of dimensional tolerances and the like. obtain. When the number of contact points with the virtual inscribed circle V varies, the contact state with the insertion portion 405 becomes unstable. In the present embodiment, such a phenomenon is avoided by the virtual inscribed circle V being in contact with the inner peripheral surface 288 at three points. As a result, the above-described frictional force is stabilized, so that it is possible to realize a design in which the suction tube 400 is stably held in the mounted state and the suction tube 400 can be easily attached and detached.

  By providing the rounded surface 285, the deformability (spring property) of the inner peripheral surface is ensured. In other words, the provision of the rounded surface 285 makes it easier for the through-hole 289 to expand due to the force received by the flat surface 284 when the insertion portion 405 is inserted. For this reason, excessive force is not generated when the insertion portion 405 is inserted into the through-hole 289, which facilitates insertion.

  Since the convex portion 290 is arranged in the space formed by the bent surface 285, the insertion portion 405 can be inserted into the ring member 280 without the insertion portion 405 interfering with the convex portion 290.

  FIG. 14 shows the appearance of the handpiece 200 in the disassembled state. Since the convex part 290 is not visible in the arrow view of FIG. 14, it is indicated by a broken line. The front end surface 291 (see FIG. 16) of the convex portion 290 is positioned on the minus side in the X2 direction by the clearance C1 from the front end surface 281 of the ring member 280. That is, with respect to the X2 direction, the front end surface 291 of the convex portion 290 is retracted closer to the inner side of the housing 210 than the front end surface 281 of the ring member 280. For this reason, the convex part 290 does not interfere with the flange 410 in the mounted state.

  FIG. 15 shows a state where the second housing 210b is removed from the first housing 210a. The second housing 210b can be removed from the first housing 210a by removing the screws 221, 222, and 223. Conversely, the second housing 210b is aligned with the first housing 210a, and the screws 221, 222, and 223 are inserted into holes 221b, 222b (not shown), and 223c (not shown) provided in the second housing 210b. If tightened through, it can be attached to the first housing 210a.

  The operation of removing the second housing 210b as described above includes a step of pulling the convex portion 290 from the ring member 280 to the X2 direction minus side. The operation of attaching the second housing 210b includes a step of inserting the convex portion 290 into the ring member 280 on the plus side in the X2 direction.

  The convex portion 290 inserted into the ring member 280 as described above prevents the first housing 210a and the second housing 210b from separating in the Y direction on the plus side in the X2 direction with respect to the screw 221. For this reason, the first housing 210a and the second housing 210b can be firmly coupled without fastening the vicinity of the tip of the housing 210 with a screw. The tip here refers to the end on the plus side in the X1 direction and the end on the plus side in the X2 direction.

  As described above, since the tips are joined by the configuration provided in the first housing 210a and the second housing 210b, an increase in the number of parts is avoided, and a risk that parts added for joining fall off during the operation. Sex is also avoided.

  The suction flow path member 230 includes a head 235 (described later together with FIG. 19) at the end on the plus side in the X2 direction. In a state where the second housing 210b is removed from the first housing 210a, half of the head 235 is accommodated in the accommodation space Sa (described later with reference to FIG. 19). The half of the head 235 here is a portion located on the minus side in the Y direction in the head 235 divided into two equal parts by the Z2-X2 plane.

  On the other hand, an accommodation space Sb is provided in the second housing 210b. In a state where the second housing 210b is attached to the first housing 210a, the head 235 is accommodated in the accommodating space S formed by the accommodating space Sa and the accommodating space Sb (see FIG. 20).

  16 and 17 are perspective views showing the second housing 210b in the vicinity of the convex portion 290. FIG. The convex portion 290 includes a tip surface 291, a slope 292, an outer peripheral surface 293, and an inner peripheral surface 294. As shown in FIG. 11, the outer peripheral surface 293 and the inner peripheral surface 294 are shaped so as to be fitted on the rounded surface 285. The outer peripheral surface 293 is configured by five planes. The inner peripheral surface 294 is configured by an arc surface. The front end surface 291 is a portion that is located closest to the X2 direction plus side in the second housing 210b.

  The slope 292 is a part formed by chamfering the tip surface 291 and each surface constituting the outer peripheral surface 293. By forming the inclined surface 292, it becomes easy to insert the convex portion 290 into the twisted surface 285.

  As shown in FIG. 17, the second housing 210b is formed with a stopper 211b, a small diameter portion 212b, a large diameter portion 213b, and a wall 214b. The stopper 211b, the small diameter part 212b, the large diameter part 213b, and the wall 214b form part of the boundary surface of the accommodation space Sb described with reference to FIG. In addition to these boundaries, the accommodation space Sb is a space that is partitioned by virtually closing a through hole opened in the stopper 211b and the wall 214b.

  FIG. 18 is a perspective view of the first housing 210 a in the vicinity of the ring member 280. As shown in FIG. 18, the first housing 210a is formed with a stopper 211a, a small diameter portion 212a, a large diameter portion 213a, and a wall 214a. The stopper 211a, the small diameter part 212a, the large diameter part 213a, and the wall 214a each form part of the boundary of the accommodation space Sa described with reference to FIG. In addition to these boundaries, the accommodation space Sa is a space that is partitioned by virtually closing a through hole opened in the stopper 211a and the wall 214a. These configurations are symmetrical with respect to the stopper 211b, the small diameter portion 212b, the large diameter portion 213b, and the wall 214b of the second housing 210b.

  FIG. 19 shows a state in which the suction flow path member 230 is removed from the first housing 210 a and the supply pipe 205 penetrates the ring member 280. The suction channel member 230 includes a head 235. The head 235 is formed on the most positive side in the X2 direction of the suction flow path member 230, that is, on the most positive side in the X2 direction on the distal end side 232, and has an outer diameter larger than other portions of the suction flow path member 230. The outer diameter of the head 235 is larger than the inner diameter of the stopper 211a and smaller than the inner diameters of the small diameter portion 212a and the large diameter portion 213a.

  When attaching the suction flow path member 230 to the first housing 210a, the suction flow path member 230 is moved closer to the ring member 280, and half of the head 235 is stored in the storage space Sa. By doing so, the movement of the head 235 to the X2 direction plus side is restricted by the wall 214a. Further, the movement of the head 235 to the minus side in the X2 direction is restricted by the stopper 211a. Furthermore, the movement of the head 235 in the Y direction minus side or the Z2 direction is restricted by the small diameter portion 212a and the large diameter portion 213a.

  By fixing the second housing 210b having a similar structure to the first housing 210a, the movement of the head 235 to the plus side in the Y direction is restricted by the small diameter portion 212b and the large diameter portion 213b. As a result, the head 235 is held in the accommodation space S.

  FIG. 20 is a cross-sectional view of the handpiece 200 and the suction tube 400 in an exploded state. FIG. 21 is a cross-sectional view of the handpiece 200 in the mounted state. The seal between the suction pipe 400 and the suction flow path member 230 will be described with reference to FIGS.

  The head 235 includes a seal portion 235A. The seal portion 235A is a portion that rises from the inner wall of the head 235 toward the insertion portion 405 in the mounted state. That is, the seal portion 235 </ b> A is a portion that rises from the inner wall of the head 235 toward the central axis of the head 235.

  The inner diameter of the narrowest part in the seal portion 235A is an inner diameter d4. The seal portion 235A is located on the plus side of the center of the head 235 in the X2 direction. For this reason, the seal portion 235A is disposed within the range of the large diameter portions 213a and 213b in the X2 direction. In the head 235, the inner diameter of the most spread part is the inner diameter d5. The inner diameter d5 is larger than the outer diameter D2 of the insertion portion 405.

  Because of the dimensional relationship as described above, when the insertion portion 405 is inserted into the head 235, an interference fit is performed. That is, when the insertion portion 405 is inserted into the head portion 235, as shown in FIG. 21, the seal portion 235A receives a force outward in the radial direction, and the head portion 235 is deformed. The clearance between the suction pipe 400 and the suction flow path member 230 is sealed by the reaction force generated by this deformation and the contact pressure between the outer peripheral surface of the insertion portion 405.

  The reason why the large-diameter portion 213a and the large-diameter portion 213b are provided is to prevent the deformation from being hindered by the contact between the head 235 and the housing 210. For this reason, the position of the seal portion 235A in the X direction (insertion direction) is included in the range of the large diameter portion 213a and the large diameter portion 213b in the X2 direction.

  On the other hand, the small-diameter portion 212a and the small-diameter portion 212b are provided in order to stabilize the radial position of the head 235 and to suppress the head 235 from excessively expanding in the radial direction in the mounted state. It is.

  The user can correctly mount the suction pipe 400 by pushing the suction pipe 400 until the flange 410 contacts the ring member 280. At this time, the outer peripheral surface of the insertion portion 405 contacts only the seal portion 235A. Therefore, the contact area between the insertion portion 405 and the head portion 235 is constant and hardly changes depending on the depth of the push-in. For this reason, the frictional force between the insertion portion 405 and the head 235 hardly changes depending on the depth of the pushing. For this reason, poor mounting is unlikely to occur. In this case, the mounting failure means that the depth of the above-mentioned pressing increases, the pressing force increases, and the user stops the pressing before the flange 410 contacts the ring member 280.

  The inner diameter of the suction tube 400 is an inner diameter d6. The inner diameter of the suction channel member 230 is an inner diameter d7. The inner diameter d7 is larger than the inner diameter d6. That is, the flow path diameter of the suction flow path member 230 is larger than the flow path diameter of the suction pipe 400. For this reason, it is suppressed that the solid substance etc. which have flowed through the suction pipe 400 flow into the suction flow path member 230, and the flow as suction becomes smooth.

  The present invention is not limited to the embodiments, examples, and modifications of the present specification, and can be implemented with various configurations without departing from the spirit of the present invention. For example, the technical features in the embodiments, examples, and modifications corresponding to the technical features in the embodiments described in the summary section of the invention are to solve some or all of the above-described problems, or In order to achieve part or all of the effects described above, replacement or combination can be performed as appropriate. If the technical feature is not described as essential in this specification, it can be deleted as appropriate. For example, the following are exemplified.

  Modification 1 will be described. FIG. 22 shows a cross section of the suction tube 400a and the handpiece 200 in a disassembled state. The suction tube 400a is used instead of the suction tube 400 of the embodiment. The handpiece 200 is the same as that in the embodiment. The suction tube 400a includes a recess 405a in the insertion portion 405. The recess 405a is an annular recess provided on the outer periphery of the insertion portion 405. The cross section of the recess 405a has an arc shape.

  FIG. 23 shows a cross section of the suction tube 400a and the handpiece 200 in the mounted state. When the suction tube 400a is used, the seal portion 235A fits into the recess 405a when the insertion portion 405 is inserted to the correct position. For this reason, the user feels a click feeling when the insertion of the insertion portion 405 is performed to the correct position. Therefore, the user can easily determine by tactile sense that the suction tube 400a has been correctly attached.

  Modification 2 will be described. FIG. 24 is a diagram of the connection unit 10 as viewed from the plus side in the X2 direction to the minus side. FIG. 25 is a cross-sectional view of the handpiece 200b in the vicinity of the connecting portion 10. The hand piece 200b is used instead of the hand piece 200 of the embodiment.

  The handpiece 200b includes a first housing 200c and a second housing 200d. The first housing 200c includes a ring member 280b. The ring member 280b includes a stepped portion 287. The step portion 287 is a part of the bent surface 285. As shown in FIG. 25, the step portion 287 is a portion that forms a step on the rounded surface 285, and forms a plane parallel to the YZ2 plane.

  The second housing 200d includes a convex portion 290b. The convex part 290 b includes a claw part 299. A nail | claw part is a site | part which protruded in the Y direction plus direction from the outer peripheral surface of the convex part 290b.

  As shown in FIG. 25, the claw portion 299 is hooked on the step portion 287 in a state where the first housing 210c and the second housing 200d are coupled. For this reason, even if the screws 221, 222, and 223 are loosened, the possibility that the first housing 210c and the second housing 200d are separated is reduced.

Hereinafter, other modifications will be described.
In order to eject the liquid intermittently, a configuration may be used in which the liquid is ejected by irradiating an electromagnetic wave such as an optical maser or laser or heating the liquid with a heater or the like.

  The surgical apparatus 20 may be of a type that crushes a living tissue using an ultrasonic wave, for example, as an apparatus for performing an operation using a liquid. Even in such a surgical apparatus, a configuration similar to that described in the embodiment may be adopted for supplying liquid from the supply tube 205 and sucking the liquid or excised living tissue from the suction tube 400. Good.

  The shape of the ring member 280 and the insertion portion 405 may be changed while maintaining that the suction tube 400 is detachable from the housing 210. For example, the virtual inscribed circle V may contact the through hole 289 of the ring member 280 at four or more points.

  You may change that the convex part 290 is arrange | positioned in the drooping surface 285 in a mounting state. For example, as a configuration of the ring member 280, the crease surface 285 may not be provided. The convex portion may contact the insertion portion 405 in the mounted state.

The distal end surface of the insertion portion 405 may not be chamfered.
The suction tube 400 may not include the flange 410. Even if the flange 410 is not provided, the suction tube 400 can be correctly mounted by pushing until the distal end surface of the insertion portion 405 contacts the head 235.

The tip surface 291 of the convex portion 290 may not be chamfered.
The front end surface 291 of the convex portion 290 may protrude outward from the front end surface 281 of the ring member 280.

  The ring member 280 and the convex portion 290 may be eliminated, and the shapes of the first housing 210a and the second housing 210b may be formed symmetrically in the connection portion 10. In this case, the first housing 210a may be shaped like the ring member 280 is cut away, or the second housing 210b may be shaped like the raised portion 290 is cut away. Further, in this case, in order to connect the first housing 210a and the second housing 210b at the end portions, ring-shaped separate members may be put on the end portions of the first housing 210a and the second housing 210b.

The supply pipe 205 may not penetrate the ring member 280. In this case, the nozzle 207 that is the end of the supply pipe 205 may be disposed inside the ring member 280.
The handpiece 200 may not include the supply pipe 205. When the supply tube 205 is not held, the surgical device 20 may be used as a suction device.

Regarding the double pipe formed by the suction flow path member 230 and the supply pipe 205, the supply pipe 205 may be an outer pipe member and the suction flow path member 230 may be an inner pipe member.
The angle formed between the holding portion 233 and the outer tube member may not be equal to the angle formed between the front end side 205b2 and the rear end side 205a2.
The inner tube member may be formed of an insulating material.
The insulating member 270 may be omitted.

The interference fit between the insertion portion 405 and the head 235 may be a fit with the suction channel 400 as a hole and the suction tube 400 as a hole. In this case, the seal portion 235 </ b> A provided on the head 235 may be provided on the outer peripheral surface of the head 235.
Instead of the seal portion 235A, a seal portion may be provided in the insertion portion 405. The seal portion provided in the insertion portion 405 is a portion that rises toward the head portion 235 that is an interference fitting counterpart member. That is, this seal portion is provided on the outer peripheral surface of the insertion portion 405 when the insertion portion 405 is an interference fit shaft as in the embodiment, and unlike the embodiment, the insertion portion 405 becomes an interference fit hole. In the case, it is provided on the inner peripheral surface of the insertion portion 405.
In addition to the seal portion 235 </ b> A, the seal portion may be provided on the outer peripheral surface of the insertion portion 405.

  The head 235 may not be stored in the storage space S. For example, the head 235 may be disposed outside the ring member 280.

In the embodiment, the configuration in which the liquid is intermittently ejected is employed, but a configuration having a function of ejecting the liquid continuously may be employed. For example, the structure which can selectively use intermittent injection and continuous injection may be sufficient. In order to perform continuous injection using the hardware configuration of the embodiment, only the tube pump may be driven in a state where the drive of the drive unit is stopped or lowered. In this configuration, intermittent spraying may be performed for excision and continuous spraying may be performed for cleaning.
Or the structure which can implement only continuous injection may be sufficient. In the case of this configuration, the ablation may be performed by continuous injection.
The liquid to be ejected may be pure water or a chemical solution.

  In the content described so far, some or all of the functions and processes realized by software may be realized by hardware. In addition, some or all of the functions and processes realized by hardware may be realized by software. As the hardware, for example, various circuits such as an integrated circuit, a discrete circuit, or a circuit module obtained by combining these circuits can be used.

DESCRIPTION OF SYMBOLS 20 ... Surgical device, 30 ... Control apparatus, 31 ... Actuator cable, 31a ... 1st cable, 31b ... 2nd cable, 32 ... Pump cable, 35 ... Foot switch, 40 ... Aspirator, 41 ... Suction tube, 50 Liquid supply device 51 Water supply bag 52 Spike needle 53a First connector 53b Second connector 53c Third connector 53d Fourth connector 53e Fifth connector 54a First water supply Tube, 54b ... 2nd water supply tube, 54c ... 3rd water supply tube, 54d ... 4th water supply tube, 55 ... Pump tube, 56 ... Blockage detection mechanism, 57 ... Filter, 60 ... Tube pump, 60a ... Stator, 60b ... Rotor 62 ... Supply motor, 200 ... Handpiece, 200b ... Handpiece, 200c ... DESCRIPTION OF SYMBOLS 1 housing, 200d ... 2nd housing, 205 ... Supply pipe, 205a1 ... Branching part, 205a2 ... Rear end side, 205b1 ... Inner pipe part, 205b2 ... Front end side, 207 ... Nozzle, 210 ... Housing, 210a ... First housing 210b ... second housing 210c ... first housing 211a ... stopper 211b ... stopper 212a ... small diameter part 212b ... small diameter part 213a ... large diameter part 213b ... large diameter part 214a ... wall 214b ... wall 221 ... Screw, 221a ... Screw hole, 222 ... Screw, 222a ... Screw hole, 223 ... Screw, 223a ... Screw hole, 230 ... Suction channel member, 231 ... Rear end side, 232 ... Front end side, 233 ... Holding part 233a ... open end, 233b ... hole, 235 ... head, 235A ... seal part, 240 ... liquid chamber, 241 ... inlet channel, 250 ... flow Connection member, 253 ... female screw, 255 ... hole, 260 ... diaphragm, 270 ... insulating member, 271 ... end, 280 ... ring member, 280b ... ring member, 281 ... tip surface, 282 ... R portion, 283 ... arc surface 284: Flat surface, 285 ... Round surface, 287 ... Stepped portion, 288 ... Inner peripheral surface, 289 ... Through hole, 290 ... Convex portion, 290b ... Convex portion, 291 ... Tip surface, 292 ... Slope, 293 ... Outer peripheral surface 294 ... inner peripheral surface, 299 ... claw part, 300 ... drive part, 351 ... cylindrical member, 351a ... male screw, 351b ... female screw, 353 ... fixing member, 353a ... male screw, 360 ... piezoelectric element, 362 ... piston , 400 ... suction pipe, 400a ... suction pipe, 405 ... insertion part, 410 ... flange, 420 ... main part, 500 ... suction force adjusting mechanism, 510 ... suction channel member, 522 ... hole

Claims (4)

A supply pipe for injecting liquid;
A suction flow path member for sucking the liquid,
A part of the supply pipe forms a double pipe with a part of the suction channel member;
An inner tube member which is a member including the inner tube of the double tube among the supply tube and the suction flow path member is connected to the inner tube portion forming the double tube and the inner tube portion. A branch portion protruding from a hole opened in the wall of the outer tube member which is a member including the outer tube of the double tube, and
The outer tube member is an elastic member that protrudes from the periphery of the hole toward the outside of the outer tube member, and includes a holding portion for sealing the outer peripheral surface of the branch portion. Liquid ejecting apparatus. The inner pipe member includes a portion bent at a predetermined angle with respect to the branch portion,
The liquid ejecting apparatus according to claim 1, wherein an angle formed by the holding portion and the outer tube member is substantially equal to the predetermined angle. The inner tube member is formed of a conductive member,
The liquid ejecting apparatus according to claim 1, wherein at least a part includes an insulating member disposed between the branch portion and the holding portion. The liquid ejecting apparatus according to any one of claims 1 to 3, wherein the liquid is ejected intermittently.

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