JP5782763B2 - Fluid ejection device - Google Patents

Description

  The present invention relates to a fluid ejection device having an ejection tube and a suction tube.

  A method of excising, incising, and crushing a living tissue using a fluid ejecting apparatus has excellent characteristics as a surgical tool, such as being free from thermal damage and capable of preserving tubule tissue such as blood vessels. When an operation or the like is performed using such a fluid ejecting apparatus, the ejected liquid or ablated tissue may accumulate in the surgical site and a visual field may not be secured. For this purpose, there are some which are provided with a suction tube for sucking and removing liquid and excised tissue.

  As an example of such a fluid ejecting apparatus, an apparatus in which an ejecting pipe for ejecting high-pressure fluid is arranged in a suction channel of the suction pipe so as to be concentric with the suction channel. (For example, refer to Patent Document 1).

  As another example, there has been proposed a fluid ejecting apparatus in which an ejection pipe for ejecting high-pressure fluid is inserted in a state of being eccentric with respect to an inner peripheral surface of a suction pipe (see, for example, Patent Document 2). ).

Japanese Patent Laid-Open No. 1-313047 JP-A-6-90957

  In Patent Document 1 described above, since the inner peripheral surface of the suction tube and the outer peripheral surface of the injection tube are arranged concentrically, the size of the suction flow path of the suction opening (the inner peripheral surface of the suction tube) And the outer peripheral surface of the injection tube) is half of the difference between the inner diameter of the suction tube and the outer shape of the injection tube, and it is difficult to suck and remove excised tissue larger than this size. In addition, if the diameter of the suction tube is increased in order to ensure the size of the suction channel, there is a problem that the surgical field of view is narrowed.

  In addition, in the configuration in which the injection pipe is eccentrically inserted into the suction pipe as in Patent Document 2, the size of the suction channel is increased, but what is sucked adheres to the gap inside the suction pipe. There is a problem that the suction tube is easily clogged.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  Application Example 1 A fluid ejection device according to this application example includes a pulsating flow generation unit that converts a continuous flow into a pulsating flow, a suction pipe that protrudes from the pulsating flow generation unit, and the suction pipe An injection tube that is eccentrically inserted to contact the inner peripheral surface of the tube and has an injection opening communicating with the pulsating flow generating portion, and an inner peripheral surface of the suction tube and an outer peripheral surface of the injection tube A suction flow path and a suction opening formed, and a vibration generating part that is arranged on an outer periphery of the suction pipe and generates a vibration. It is fixed to the peripheral surface.

  In the fluid ejecting apparatus of Application Example 1, since the ejection pipe is inserted in an eccentric state so as to be in contact with the inner peripheral surface of the suction pipe, the size of the suction flow path is determined by the inner diameter of the suction pipe and the ejection pipe. It becomes a difference from the external shape. For example, if the inner diameter of the suction tube is d1 and the outer shape of the injection tube is d2, the suction channel size (gap size) is d1-d2, and the suction channel in the case where the suction tube and the injection tube are concentric with each other. The size is (d1-d2) / 2. Therefore, the size of the suction channel when eccentric is larger than the size of the suction channel when concentric. Therefore, when the ejection tube and the suction tube are eccentric, a larger excised tissue can be aspirated than when the ejection tube and the suction tube are concentric, the amount of ejected drainage is increased, and a good surgical field is obtained.

  In addition, by arranging the vibration generating portion on the outer peripheral portion of the suction tube, it is possible to remove the adhered matter such as excised tissue and blood adhering to the gap between the ejection tube and the suction tube by the vibration generated from the vibration generating portion. . Thereby, it can prevent that a suction flow path becomes narrow by adhesion of excised material.

The structure explanatory view showing the fluid ejecting device as a surgical instrument concerning this embodiment. Sectional drawing which shows the cut surface which cut | disconnected the pulsating flow generation part which concerns on a present Example, the injection pipe, and the suction pipe along the injection direction of a fluid. It is sectional drawing which shows the AA cut surface of FIG. 2, (A) is a present Example, (B) is sectional drawing which shows a prior art example. 2A is a diagram illustrating a state when the vibration generating unit is not driven, and FIG. 3A is a cross-sectional view taken along the line AA in FIG. 2, and FIG.

Embodiments of the present invention will be described below with reference to the drawings.
(Embodiment)

  FIG. 1 is a configuration explanatory view showing a fluid ejection device as a surgical instrument according to the present embodiment. Therefore, the fluid (continuous flow) described below is physiological saline. In FIG. 1, a fluid ejecting apparatus 1 includes a fluid supply container 2 that contains a fluid, a supply pump 10 as a fluid supply unit, and a fluid supplied from the supply pump 10 as a pulsating flow (hereinafter referred to as a pulse flow). A pulsating flow generation unit 20 to be converted to the pulsating flow generation unit 20, an injection pipe 70 communicating with the pulsating flow generation unit 20, a suction pipe 80 protruding from the pulsation flow generation unit 20, a suction pump 11 as a suction means, and a suction And a drainage container 3 for storing the drained fluid and the excised tissue. The pulsating flow generation unit 20, the supply pump 10, and the fluid supply container 2 are connected by a fluid supply tube 4. The suction tube 80, the suction pump 11, and the drainage container 3 are connected by the suction tube 5.

  Note that the pulsating flow generation unit 20 is suitable as long as it is a piezo method using a piezoelectric element, a bubble jet (registered trademark) method, or the like that can convert a fluid into a pulsating flow and eject it in pulses. Although it is possible, the pulsating flow generation unit described below will be described by exemplifying a piezo method.

  The ejection pipe 70 has an ejection flow path 71 that communicates with a fluid chamber 60 formed inside the pulsating flow generation section 20, and an ejection opening 72 having a reduced flow path is opened at the tip.

  The ejection tube 70 is eccentrically inserted into the suction tube 80 so that the outer peripheral surface is in contact with the inner peripheral surface of the suction tube 80. The injection pipe 70 is fixed to the inner peripheral surface of the suction pipe 80 by a fixing means such as adhesion. A gap formed between the inner peripheral surface of the suction tube 80 and the outer peripheral surface of the injection tube 70 is a suction flow path 81 and is a suction opening 82. It is desirable that the ejection pipe 70 has a rigidity that does not deform during fluid ejection, and that the suction pipe 80 has a higher rigidity than the ejection pipe 70.

Next, the flow of fluid in the fluid ejecting apparatus 1 configured as described above will be briefly described. The fluid stored in the fluid supply container 2 is absorbed by the supply pump 10 and is supplied to the pulsating flow generation unit 20 through the fluid supply tube 4 at a constant pressure. The pulsating flow generation unit 20 includes a fluid chamber 60, and a piezoelectric element 30 and a diaphragm 40 as volume changing means for changing the volume of the fluid chamber 60. The fluid chamber is driven by driving the piezoelectric element 30. A pulsating flow is generated in 60, and the fluid is jetted at high speed from the jet opening 72 through the jet flow path 71.
When the pulsating flow generation unit 20 stops driving, that is, when the volume of the fluid chamber 60 is not changed, the fluid supplied at a constant pressure from the supply pump 10 passes through the fluid chamber 60 and is ejected through the ejection opening. The continuous flow is ejected from the section 72.

  Here, the pulsating flow means a fluid flow in which the fluid flow direction is constant and the fluid flow rate or flow velocity is accompanied by periodic or irregular fluctuations. The pulsating flow includes an intermittent flow in which the flow and stop of the fluid are repeated. However, since the flow rate or flow rate of the fluid only needs to change periodically or irregularly, the pulsating flow is not necessarily an intermittent flow.

  Similarly, ejecting fluid in a pulsed manner means ejecting fluid in which the flow rate or moving speed of the fluid to be ejected varies periodically or irregularly. An example of pulsed injection is intermittent injection in which fluid injection and non-injection are repeated. However, since the flow rate or moving speed of the fluid to be injected only needs to fluctuate periodically or irregularly, it is not always intermittent injection. Need not be.

  Next, suction will be described. The fluid ejected from the ejection opening 72 stays as drainage at the surgical site. In addition, an incised living tissue exists in the surgical site. These drainage and excised tissue are sucked by the suction pump 11 and stored in the drainage container 3 from the suction opening 82 via the suction flow path 81 and the suction tube 5. The driving of the suction pump 11 may be interlocked with the driving of the pulsating flow generation unit 20 or may be intermittently driven periodically.

The shapes and structures of the injection tube 70 and the suction tube 80 will be described as specific examples with reference to the drawings.
(Example)

First, this embodiment will be described.
FIG. 2 is a cross-sectional view illustrating a cut surface obtained by cutting the pulsating flow generation unit 20, the ejection pipe 70, and the suction pipe 80 according to the present embodiment along the fluid ejection direction. The pulsating flow generation unit 20 includes an inlet channel 61 that supplies a fluid from the supply pump 10 to the fluid chamber 60 via the fluid supply tube 4, a piezoelectric element 30 that serves as a volume changing unit that changes the volume of the fluid chamber 60, and a diaphragm. 40 and an outlet channel 62 communicating with the fluid chamber 60.

  The diaphragm 40 is made of a disk-shaped metal thin plate, and is tightly fixed by a lower case 50 and an upper case 52. In the present embodiment, the piezoelectric element 30 is an example of a laminated piezoelectric element, and one of both ends is fixed to the diaphragm 40 via the upper plate 35 and the other is fixed to the bottom plate 51.

  The fluid chamber 60 is a space formed by a recess formed on the surface of the upper case 52 facing the diaphragm 40 and the diaphragm 40. An outlet channel 62 is opened at a substantially central portion of the fluid chamber 60.

  The upper case 52 and the lower case 50 are joined and integrated on opposite surfaces (diaphragm 40 is interposed in FIG. 2). An injection pipe 70 having an injection flow path 71 communicating with the outlet flow path 62 is fitted into the upper case 52, and an injection opening 72 having a reduced flow path diameter is formed at the tip of the injection pipe 70. . In addition, you may comprise the injection opening part 72 with a nozzle.

  Further, the upper case 52 is provided with a suction tube 80 as an outer tube of the injection tube 70. An opening 83 penetrating the side wall is opened near the proximal end of the suction pipe 80 on the pulsating flow generation unit 20 side, and the suction tube 5 is attached so as to communicate with the opening 83. Since the surgeon grasps and operates the pulsating flow generation unit 20, the extending direction of the suction tube 5 near the pulsating flow generation unit 20 is the same direction as the fluid supply tube 4, thereby improving operability. can do.

  As shown in the drawing, the ejection pipe 70 is inserted in the suction pipe 80 in an eccentric state. Therefore, the outer peripheral surface of the injection tube 70 and the inner peripheral surface of the suction tube 80 are in contact with each other within the length of the suction tube 80 or have a small gap.

  The vibration generating means 90 is arranged on the outer periphery of the suction pipe 80 on the side fixed to the injection pipe 70. The vibration generating unit 90 is provided with a plurality of vibration generating units 91. Here, the vibration generating unit 91 may be any unit that generates ultrasonic waves. For example, a piezoelectric element, an ultrasonic transducer, or the like is used.

  3A and 3B are cross-sectional views showing the AA section of FIG. 2, wherein FIG. 3A shows this embodiment and FIG. 3B shows a conventional example. As shown to (A), the outer peripheral surface of the injection tube 70 and the inner peripheral surface of the suction tube 80 are in contact. A gap between the flow path of the suction pipe 80 and the outer peripheral surface of the injection pipe 70 formed in this way is the suction flow path 81, the flow path diameter of the suction pipe 80 is d1, and the outer diameter of the injection pipe 70 is d2. Then, (d1-d2) becomes the maximum size of the suction flow path 81.

  By the way, in Patent Document 1, the injection tube 70 is inserted so as to be concentric with the suction tube 80. In such a case, the maximum size of the suction flow path 81 is (d1-d2) / 2, and even if the total area of the suction flow path 81 is the same, the size of the suction flow path 81 is eccentric. The embodiment is larger. The size of the suction opening 82 is the same as that of the suction channel 81.

  In this embodiment, the outer peripheral surface of the injection tube 70 is in contact with the inner peripheral surface of the suction tube 80. In such a structure, the injection tube 70 is inserted into the suction tube 80, and is fixed with an adhesive or the like while the inner peripheral surface of the suction tube 80 and the outer peripheral surface of the injection tube 70 are in contact with each other. If it is press-fitted into the case 52, it can be assembled. At this time, as shown in FIG. 2, the upper case 52 side base end portion of the injection pipe 70 protrudes from the base end portion of the suction pipe 80 and is press-fitted into the upper case 52, and the suction pipe 80 is free from the upper case 52. What is necessary is just to fix with an adhesive etc. in relation to intuition. In order to fix the injection pipe 70 and the suction pipe 80 to the upper case 52, it is desirable to reinforce the sealing with an adhesive, a brazing agent, or the like.

  It should be noted that the injection tube 70 and the suction tube 80 are preferably fixed to the entire contact range in the lengthwise direction. By adopting such a configuration, the ultrasonic vibration from the vibration generating means 90 can be directly transmitted to the ejection tube 70. Directly transmitted ultrasonic waves generate fine bubbles on the surfaces of the ejection tube 70 and the suction tube 80. By applying the peeling effect due to the generation of microbubbles on the surface of the tube and the impact force of the generated microbubbles themselves, the deposit 110 easily adheres to the gap and is not easily peeled off by simple suction. Even so, it can be effectively removed.

  Further, it is desirable that the size of the flow path of the opening 83 and the suction tube 5 provided in the suction pipe 80 is the same as or larger than the flow path cross-sectional area of the suction opening 82. By doing in this way, the excised material sucked through the suction tube 80 can be sucked into the suction tube 5 without adhering at the opening 83.

  4 shows a state where the adhering matter 110 sucked in FIG. 3 is clogged, (A) is a state where the vibration generating means 90 is not driven, and (B) is a state where the vibration generating means 90 is being driven. Is shown. As shown in FIG. 4, by bringing the spray tube 70 into contact with the inner peripheral surface of the suction tube 80, the area of the suction channel 81 is increased, but the deposit 110 is easily clogged with the gap 100.

  Therefore, when the vibration generating means 90 is driven, ultrasonic vibration is transmitted to the suction tube 80 as shown in FIG. It can move gradually and can be sucked by the suction tube 80. A plurality of vibration generating means 90 may be disposed along the outer periphery of the suction pipe 80. By arranging a plurality of vibration generating means 90, a larger vibration can be given to the small gap 100 portion in contact with the injection pipe 70, particularly the inner peripheral portion of the suction pipe. Further, if a liquid is flowing in the suction pipe 80, bubbles are generated by ultrasonic vibration, and the removal ability is improved by the peeling effect of the bubbles and the impact force of the bubbles. Further, by arranging a plurality of vibration generating portions 91, bubbles are also generated on the inner surface of the suction tube 80 where no bubbles are generated in one vibration generating portion 91. Therefore, it is possible to improve the ability to remove the deposit 110 that is difficult to peel off.

  In addition, as shown in FIG. 2, a plurality of vibration generators 91 can be arranged in the longitudinal direction and individually controlled. By controlling the vibration generators 91 individually, monotonous ultrasonic vibrations can be obtained. In addition, since it is possible to give a complicated vibration instead, it is possible to give an optimum vibration according to characteristics such as elasticity and viscosity of the object to be sucked, and thus the deposit 110 can be more effectively removed. .

  Next, the pulse flow ejection operation of the pulsating flow generation unit 20 in the present embodiment will be described with reference to FIGS. A fluid is supplied to the inlet channel 61 by the supply pump 10 at a constant pressure. The fluid supply amount from the supply pump 10 may be an amount that is substantially equal to the pulse flow injection amount from the injection opening 72. Here, when the piezoelectric element 30 does not operate, the fluid flows into the fluid chamber 60 due to the difference between the discharge force of the supply pump 10 and the channel resistance on the entire inlet channel 61 side.

  When a drive signal is input to the piezoelectric element 30 and the piezoelectric element 30 rapidly expands in a direction perpendicular to the surface of the diaphragm 40 on the fluid chamber 60 side, the volume of the fluid chamber 60 is reduced, and the pressure in the fluid chamber 60 is It rises rapidly and reaches several tens of atmospheres.

  At this time, since the increase amount of the fluid discharged from the outlet channel 62 is larger than the decrease amount of the flow rate of the fluid flowing from the inlet channel 61 into the fluid chamber 60, the pulsating flow is generated in the ejection channel 71. . The pressure fluctuation at the time of discharge propagates through the ejection pipe 70, and the fluid pulsed from the ejection opening 72 at the tip is ejected at high speed.

  According to the present embodiment described above, since the injection pipe 70 is inserted in a state of being eccentric to the suction pipe 80, the size of the suction flow path 81 and the suction opening 82 is the inner diameter of the suction pipe 80. And the difference in the outer shape of the injection pipe 70. Therefore, the size of the suction channel 81 and the suction opening 82 when eccentric is larger than the size when concentric. Therefore, when the ejection tube 70 and the suction tube 80 are decentered, a larger excised tissue can be aspirated than in the case of concentricity, and the amount of ejected waste liquid is increased, resulting in a good surgical field of view. It is done. In addition, clogging of the attached material 110 such as ablated tissue and blood generated inside the suction tube 80 can be removed by ultrasonic vibration generated from the vibration generating unit 91. It is possible to prevent the suction channel 81 from becoming narrow.

  FIG. 5 shows a state of (A) one mark and (B) another mark on the AA cut plane of FIG. As shown in FIG. 5A, a notch 73 as a mark indicating the position of the ejection opening 72 may be provided in the vicinity of the suction opening 82 of the suction tube 80. According to this, even in the configuration in which the ejection tube 70 is eccentrically inserted with respect to the suction tube 80, the position of the ejection opening 72 is determined by providing the notch 73 indicating the position of the ejection opening 72. Therefore, fluid can be ejected accurately with respect to the surgical site position.

  Further, as shown in FIG. 5B, the notch portions 74a, 74b, 74c, and 74d formed around the periphery of the suction opening portion 82 are provided as compared with the provision of the one notch portion 73 as the mark described above. Alternatively, it may be a through hole (not shown) opened near the suction opening 82. In the case of FIG. 5B, the notch 74 a is a mark indicating the position of the injection opening 72. According to this, by forming the notch 74a over the periphery of the suction opening 82, the position of the ejection opening 72 can be recognized, and the suction opening 82 is divided into the notches 74b to 74d. Can only be enlarged. Further, in the case of the through-hole, it becomes possible to perform suction removal of the excised tissue in the lateral direction in addition to the distal end portion.

  DESCRIPTION OF SYMBOLS 1 ... Fluid injection apparatus, 20 ... Pulse flow generation part, 70 ... Injection pipe, 72 ... Injection opening part, 73, 74a-74d ... Notch part, 80 ... Suction pipe, 81 ... Suction flow path, 82 ... Suction opening part 90 ... vibration generating means, 91 ... vibration generating unit.

Claims (3)

A suction tube for sucking at least one of a biological tissue and a fluid;
An injection pipe which is inserted in an eccentric state in the suction pipe and jets a fluid;
Is disposed on the outer periphery of the suction tube, have a, a vibration generating unit for generating a vibration,
The outer peripheral surface of the injection tube is in contact with the inner peripheral surface of the suction tube;
The fluid ejecting apparatus according to claim 1, wherein the vibration generating unit is disposed only on an outer periphery of the suction tube that is in contact with the ejecting tube . The fluid ejecting apparatus according to claim 1,
The previous SL vibration generating unit has a plurality of spaced apart in a longitudinal direction of said suction tube,
A fluid ejecting apparatus. The fluid ejection device according to claim 2,
The plurality of vibration generation units include a first vibration generation unit and a second vibration generation unit,
A fluid ejecting apparatus capable of causing the first vibration generating unit to generate a vibration different from that of the second vibration generating unit.