JP2011193949A - Fluid injection apparatus - Google Patents

Abstract

A fluid ejection device having an ejection tube and a suction tube is provided.
A fluid ejecting apparatus includes a pulsating flow generation unit that converts a fluid into a pulsating flow, a suction pipe that projects from the pulsating flow generation unit, and an eccentric insertion in the suction pipe. An injection pipe 70 having an injection opening 72 communicating with the pulsating flow generation unit 20; a suction flow path 81 and a suction opening 82 formed between the inner peripheral surface of the suction pipe 80 and the outer peripheral surface of the injection pipe 70; In the vicinity of the injection opening 72, the injection opening 72 and the suction pipe 80 are disposed concentrically. Therefore, it is easy for the surgeon to recognize the position of the ejection opening, and it is easy to eject the fluid to the target surgical site.
[Selection] Figure 2

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, there has been proposed an ejecting pipe that ejects high-pressure fluid in a suction channel of the suction pipe and concentrically with the suction channel (for example, Patent Document 1).

  As another example, there has been proposed a fluid ejecting apparatus in which an ejecting 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). .

  Further, there is a fluid ejecting apparatus that rapidly changes the volume of a fluid chamber by volume changing means to convert the fluid into a pulsating flow and ejects the fluid at high speed in a pulsed manner from an ejection opening (for example, see Patent Document 3).

Japanese Patent Laid-Open No. 1-313047 JP-A-6-90957 JP 2008-82202 A

  In patent document 1 mentioned above, it arrange | positions so that the internal peripheral surface of a suction tube and the outer peripheral surface of an injection tube may become concentric. The size of the suction channel (the gap size between the inner peripheral surface of the suction tube and the outer peripheral surface of the injection tube) is ½ of the difference between the inner diameter of the suction tube and the outer diameter of the injection tube. In a suction channel having such a large length and a long channel length, a large excised tissue is likely to be clogged in the middle and difficult to suck and flow. Further, when the diameter of the suction tube is increased in order to ensure the size of the suction channel, there is a problem that it is difficult for the operator to recognize the position of the ejection opening.

  Moreover, in patent document 2, since the injection tube is inserted in the state eccentric to the inner peripheral surface of the suction tube, the size of the suction channel is determined by the inner diameter of the suction tube and the outer diameter of the injection tube. The difference is greater when using a suction tube with the same inner diameter as that of Patent Document 1 and an injection tube with the same outer diameter than in the case of concentricity. However, if the ejection opening is eccentric with respect to the suction tube, it is difficult to recognize the position of the ejection opening, and thus there is a problem that it is difficult to eject the fluid to an accurate position with respect to the surgical site.

  When jetting high-pressure fluid, vibration may occur near the tip of the jet tube, that is, near the jet opening, making it more difficult to jet the fluid to the target surgical site.

  Further, the fluid ejecting apparatus according to Patent Document 3 can cut off the high-pressure fluid of Patent Document 1 or Patent Document 2 described above with a smaller flow rate than that in which the fluid is ejected in a continuous flow, but improves the visibility of the surgical site. Therefore, it may be required to provide a suction tube for suctioning or removing the excised tissue. In such a case, in order to enlarge the suction flow path, it is possible to employ a structure in which the injection tube is inserted in a state of being eccentric with respect to the inner peripheral surface of the suction tube as in Patent Document 2. However, when the fluid is ejected in pulses, the vibration of the ejection tube is expected to be greater than that of continuous flow ejection.

  When vibration occurs in the injection tube, the suction tube and the suction tube hit to generate an abnormal sound, or the suction tube resonates due to vibration of the tip (injection opening) of the injection tube. It becomes difficult to eject the fluid to the nozzle.

  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 fluid into a pulsating flow, a suction pipe projecting from the pulsating flow generation unit, and an eccentric insertion in the suction pipe. And an injection pipe having an injection opening communicating with the pulsating flow generation section, a suction flow path formed between an inner peripheral surface of the suction pipe and an outer peripheral surface of the injection pipe, and the suction flow path A suction opening formed at an end, and the spray opening and the suction pipe are concentrically disposed in the vicinity of the spray opening.

  According to this application example, since the injection opening and the suction tube are concentrically disposed in the vicinity of the injection opening, the operator can easily recognize the position of the injection opening and apply fluid to the target operation part. It becomes easy to inject.

  On the other hand, the injection pipe is inserted eccentrically with respect to the inner peripheral surface of the suction pipe in most length regions other than the vicinity of the injection opening. For example, if the inner diameter of the suction tube is d1 and the outer diameter of the injection tube is d2, the size of the suction channel (gap size) is d1-d2, and the suction tube and the injection tube are simply concentric. The size of the suction channel is (d1-d2) / 2. Therefore, the size of the suction channel when eccentric is larger than that when concentric. Therefore, even when the suction channel is long, the excised tissue can be sucked and removed.

  Application Example 2 In the fluid ejection device according to the application example, the suction tube and the ejection tube are fixed at least on the ejection opening side of the region where the suction tube and the ejection tube are eccentric. Preferably it is.

  As described above, since the injection pipe is fixed to the inner peripheral surface of the suction pipe in the vicinity of the injection opening, the vibration of the tip of the injection pipe can be suppressed. In addition, the vibration of the injection pipe and the suction pipe is prevented from being generated by vibration, and the tip of the injection pipe (injection opening) is not moved by the vibration. The resonance of the suction pipe generated by this vibration is prevented. This is effective in that the fluid can be accurately ejected to the surgical site.

  Application Example 3 In the fluid ejection device according to the application example described above, the ejection pipe is configured such that the ejection opening is opened eccentrically with respect to the ejection pipe, and a wall portion is formed at the periphery of the ejection opening. Preferably it is.

  In this way, the injection pipe is eccentric with respect to the suction pipe, and only the injection opening is concentric. Therefore, the suction opening and the suction channel can be made larger than in the case of concentricity.

  When the ejection opening is decentered with respect to the ejection pipe, a wall is formed at the periphery of the ejection opening. Here, when a high pressure is generated by a pulsating flow generation unit as in Patent Document 3 and a fluid is jetted at high speed in a pulsed manner, the pressure wave of the fluid propagates from the pulsating flow generation unit through the inside of the injection tube, and the periphery of the injection opening It reaches to the wall part of the light and reflects, and returns to the pulsating flow generation part. This resonance effect of the pressure wave has an effect that the fluid can be pulsed more strongly.

  Application Example 4 In the fluid ejecting apparatus according to the application example described above, it is preferable that the suction pipe is provided with a notch portion formed around the periphery of the suction opening.

  By forming a notch around the periphery of the suction opening, the surgeon can more clearly recognize the position of the ejection opening, and the suction opening can be enlarged by this notch. it can.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a configuration explanatory diagram illustrating a fluid ejection device according to a first embodiment. Sectional drawing which shows the cut surface which cut | disconnected the pulsating flow generation part which concerns on 1st Example, the injection pipe, and the suction pipe along the injection direction of a fluid. The front-end | tip part structure of the injection tube and suction tube which concerns on 2nd Example is shown, (a) is a fragmentary sectional view, (b) is the front view visually recognized from the front-end | tip direction (E direction of illustration) of (a). The fragmentary sectional view which shows the front-end | tip part structure of the injection pipe and suction pipe which concern on 3rd Example. The fragmentary sectional view which shows the front-end | tip part structure of the injection pipe and suction pipe which concern on 4th Example. The fragmentary sectional view which shows the front-end | tip part structure of the injection pipe and suction pipe which concern on 5th Example. The front-end | tip part structure of the injection pipe and suction pipe which concerns on 6th Example is shown, (a) is a fragmentary sectional view, (b) is the front view visually recognized from the front-end | tip direction.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Note that the drawings referred to in the following description are schematic views in which the vertical and horizontal scales of members or portions are different from actual ones for convenience of illustration.
(Embodiment 1)

  FIG. 1 is a configuration explanatory view showing a fluid ejecting apparatus as a surgical instrument according to the first embodiment. Therefore, the fluid 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.

  The pulsating flow generator can be adapted to any method that can convert fluid into pulsating flow and jet it in a pulsed manner, such as a piezo method using a piezoelectric element or a bubble jet (registered trademark) method. However, 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 bent in the vicinity of the injection opening 72, and the injection opening 72 and the suction pipe 80 are disposed concentrically. A gap formed between the inner peripheral surface of the suction pipe 80 and the outer peripheral surface of the injection pipe 70 is a suction flow path 81, and a suction opening 82 is provided at the end of the suction flow path 81 on the injection opening 72 side. It is done. 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 sucked by the supply pump 10 and 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 velocity of the fluid only needs to fluctuate periodically or irregularly, the pulsating flow is not necessarily an intermittent flow.

  Similarly, ejecting fluid in pulses means ejecting fluid in which the flow rate or movement 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 the surgical site, there is a removed living tissue (hereinafter referred to as a resected tissue). The drainage and excised tissue are sucked from the suction opening 82 by the suction pump 11 and are stored in the drainage container 3 through the suction channel 81 and the suction tube 5. The suction pump 11 may be driven in conjunction with the driving of the pulsating flow generation unit 20, may be driven intermittently periodically, or may be driven when necessity arises.

Note that several shapes and structures of the injection tube 70 and the suction tube 80 are conceivable. Therefore, they will be described as specific embodiments with reference to the drawings.
(First embodiment)

First, the first embodiment will be described.
FIG. 2 is a cross-sectional view illustrating a cut surface obtained by cutting the pulsating flow generation unit, the ejection pipe, and the suction pipe according to the first 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 end portions 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 press-fitted into the upper case 52, and an injection opening 72 having a reduced flow path diameter is opened 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 that penetrates the tube wall is opened near the proximal end of the suction tube 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 be made.

  As shown in the drawing, the ejection pipe 70 is inserted in the suction pipe 80 in an eccentric state. The injection pipe 70 is bent in the vicinity of the injection opening 72, and the injection opening 72 and the suction pipe 80 are disposed concentrically. P represents the center of the ejection opening 72 and the suction pipe 80.

  In the first 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 fixed with an adhesive or the like in a state where 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 press-fits into the upper 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 material, or the like.

  The injection tube 70 and the suction tube 80 are preferably fixed in the entire contact range in the lengthwise direction, but at least the vicinity of the tip of the injection opening 72 (the range shown in FIG. 2 and FIG. 2B) may be fixed. . For example, the range of B in the figure is provided on the side closer to the injection opening 72 than half of the entire length of the injection pipe 70. In this case, after inserting the injection tube 70 and the suction tube 80 in this order into the upper case 52, the range shown in FIG. B may be bonded and fixed with an adhesive, a brazing material, or the like, or fixed using a fixing means such as welding. .

  When the gap between the inner peripheral surface of the suction tube 80 and the outer peripheral surface of the injection tube 70 is the suction flow channel 81, the flow channel diameter of the suction tube 80 is d1, and the outer diameter of the injection tube 70 is d2, (d1-d2 ) Is the size of the suction channel 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 this case, the size of the suction channel 81 is (d1−d2) / 2, and even though the total area of the suction channel 81 is the same, the size of the suction channel 81 is eccentric. The example is bigger.

  In the first embodiment, the injection tube 70 and the suction tube 80 are concentric near the tip. Therefore, the size of the suction channel 81 in the concentric range is (d1−d2) / 2. Therefore, the suction channel is smaller than the eccentric area. For this reason, the bent portion position 70a of the injection pipe 70 is preferably as close to the tip as possible in production.

  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.

  In FIG. 2, the inner peripheral surface of the suction tube 80 and the outer peripheral surface of the injection tube 70 are disposed so as to contact each other, but there may be a slight gap.

  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 passage 61 at a constant pressure by the supply pump 10. 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 flow path, and the fluid pulsed from the ejection opening 72 at the tip is ejected at high speed.

  According to the first embodiment described above, in the vicinity of the ejection opening 72, the ejection opening 72 and the suction tube 80 are arranged concentrically, so that the operator can easily recognize the position of the ejection opening. It becomes easy to inject a fluid to a target operation part.

  Further, the injection pipe 70 is inserted eccentrically with respect to the inner peripheral surface of the suction pipe 80 in most length regions other than the vicinity of the injection opening 72. Therefore, the size of the suction channel 81 when eccentric is larger than the size of the suction channel when concentric. Therefore, even if the suction channel 81 is long, the flow resistance of the excised tissue can be reduced and removed by suction.

  In addition, by arranging the injection opening and the suction pipe concentrically, it may be impossible to ensure a large gap between the suction pipe and the injection pipe in the vicinity of the suction port. In this case, even if the excised tissue is sucked into the suction port, if the suction force is adjusted, the excised tissue sucked up can be removed relatively easily. On the other hand, when the excised tissue is clogged in the middle of the suction channel, it is difficult to remove the tissue. Thus, the suction channel is configured to be large except for the tip as in this embodiment. It is preferable that the suction channel has a wider gap from the suction port toward the suction side, or at least maintains the same gap.

  Further, since the injection pipe 70 is fixed to the inner peripheral surface of the suction pipe 80 in the vicinity of the injection opening 72, the vibration of the tip end portion of the injection pipe 70 can be suppressed. In addition, it is possible to prevent an abnormal sound from being generated due to the vibration of the injection tube 70 and the suction tube 80, and the tip (injection opening 72) of the injection tube 70 does not move due to the vibration. The resonance of the suction tube 80 is suppressed, and there is an effect that the fluid can be accurately ejected to the surgical site position.

In the first embodiment, the structure in which the suction pipe 80 is fixed to the upper case 52 has been exemplified. However, the upper case 52 can be protruded to form a suction pipe.
Further, the arrangement position and the extending direction of the suction tube 5 are not particularly limited. However, since the operator grasps and operates the pulsating flow generation unit 20, the suction tube 5 and the fluid supply are provided in the vicinity of the pulsating flow generation unit 20. By extending the tubes 4 along each other, the balance when operating can be improved, and the operability can be improved.
(Second embodiment)

  Next, a second embodiment will be described with reference to the drawings. In the second embodiment, the injection opening 72 is concentric with the suction pipe 80 in contrast to the first embodiment described above in which the injection pipe 70 is bent to make the injection opening 72 and the suction pipe 80 concentric. It is characterized by being. Therefore, the same reference numerals as those in the first embodiment are used for explanation, focusing on the differences from the first embodiment.

  3A and 3B show the tip structure of the injection tube and the suction tube according to the second embodiment. FIG. 3A is a partial cross-sectional view, and FIG. 3B is a front view viewed from the tip direction of FIG. It is. The injection tube 70 is inserted eccentrically with respect to the suction tube 80. The injection tube 70 and the suction tube 80 are fixed with an adhesive, a brazing material, or the like using a fixing means such as welding or the like at the tip (in the range of B in the figure).

  In the injection pipe 70, the injection opening 72 is opened eccentrically with respect to the injection flow path 71. The ejection opening 72 is disposed at a position that is concentric with the suction pipe 80. Accordingly, a wall 73 is formed on the periphery of the ejection opening 72.

  As described in the first embodiment (see FIG. 2), 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 chamber 60 is reduced, and the pressure in the fluid chamber 60 rapidly increases to reach several tens of atmospheres. The pressure wave at this time propagates from the fluid chamber 60 to the ejection opening 72, is reflected by the wall 73, and returns to the fluid chamber 60. When a drive signal is input to the piezoelectric element 30 at a frequency suitable for this cycle, it can be said that the pressure wave has a resonance relationship with the drive of the piezoelectric element 30. Therefore, the fluid can be more strongly jetted in a pulse shape due to the resonance effect of the pressure wave.

Further, since the ejection tube 70 and the suction tube 80 are eccentric to the length range of the suction tube 80 including the suction opening 82, the entire length of the suction channel 81 is larger than that of the concentric case. As a result, a large excised tissue can be removed by suction.
(Third embodiment)

  Next, a third embodiment will be described with reference to the drawings. The third embodiment is a modification of the second embodiment described above, and is characterized in that the injection opening is formed by a nozzle. Therefore, the difference from the second embodiment will be mainly described.

  FIG. 4 is a partial cross-sectional view showing the tip structure of the injection pipe and the suction pipe according to the third embodiment. A nozzle 75 is inserted at the tip of the injection tube 70. The nozzle 75 is provided with an injection opening 76, and the injection opening 76 is concentric with the suction pipe 80. A wall 77 is formed on the periphery of the injection opening 76. The injection opening 76 corresponds to the injection opening 72 in FIG. 3, and the wall 77 corresponds to the wall 73 in FIG.

Therefore, the third embodiment can obtain the same effect as the second embodiment described above.
Further, since the injection opening 72 of the second embodiment is opened at the tip of the elongated injection pipe 70, the injection opening 76 is opened in the nozzle 75, so that the manufacturing is easy.
(Fourth embodiment)

  Next, a fourth embodiment will be described with reference to the drawings. The fourth embodiment is a modification of the first embodiment described above, and is characterized in that the size of the suction opening 82 is made to be substantially the same as the size of the suction flow path 81. Therefore, it demonstrates centering on a different location from 1st Example.

  FIG. 5 is a partial cross-sectional view showing the tip structure of the injection pipe and the suction pipe according to the fourth embodiment. The distal end portion 84 of the suction tube 80 is widened in the vicinity of the bent portion position 70 a of the ejection tube 70 than the other portions. The distal end portion 84 and the injection opening 72 are concentric. The flow path 81 a at the distal end portion 84 is substantially the same size as the suction flow path 81.

  Therefore, the effect that the ejection opening 72 and the suction pipe 80 are concentric is obtained, and the suction opening 82 and the suction flow path 81 are continuous with substantially the same size. (See FIG. 2), a larger excised tissue can be aspirated.

In addition, the shape of the front-end | tip part 84 is good also as a taper shape extended in a front-end | tip direction.
(5th Example)

Next, a fifth embodiment will be described with reference to the drawings. The fifth embodiment is inclined with respect to the ejection flow path 71 with respect to the fluid ejection direction of the first to fourth embodiments described above being linear or parallel to the ejection flow path 71. It is characterized by being oriented in the direction.
Depending on the surgical site, excision may be performed at a position deviating from the extending direction of the ejection tube 70. The present embodiment has a form that can cope with such a case. In addition, based on the structure of 1st Example, the same code | symbol is attached | subjected and demonstrated to a common functional element with 1st Example.

  FIG. 6 is a partial cross-sectional view showing the tip structure of the injection pipe and the suction pipe according to the fifth embodiment. The injection tube 70 and the suction tube 80 are bent at the distal end, and the injection tube 70 and the suction tube 80 are concentric at the distal end from the bent portion. Therefore, the ejection opening 72 is disposed on the center line P of the suction pipe 80. And it fixes to the inner peripheral surface of the suction pipe 80 by fixing means, such as welding or a brazing material, or a fixing means, such as welding, on the base end side of the bent portion.

  In addition, when the flow path diameter of the suction pipe 80 is d1, and the bending height of the injection pipe 70 is represented by h, the flow path diameter d1 is set to satisfy the relationship of h <d1. By doing in this way, it becomes possible to insert the injection pipe 70 in the suction pipe 80.

According to such a configuration, it is possible to perform excision at a position displaced from the straight line of the ejection tube 70 (suction tube 80) and suction removal of the excised tissue.
(Sixth Embodiment) Claim 4

  Next, a sixth embodiment will be described with reference to the drawings. As described in each of the above-described embodiments, the ejection opening 72 is disposed concentrically with the suction tube 80, which makes it easier for the operator to recognize the position of the ejection opening 72. The present embodiment is characterized in that the injection opening 72 is configured to be visible by providing a notch portion in the suction tube 80 around the periphery of the suction opening 82. In addition, based on the structure of 1st Example, the same code | symbol is attached | subjected and demonstrated to a common functional element with 1st Example.

  7A and 7B show the tip structure of the injection tube and the suction tube according to the sixth embodiment, where FIG. 7A is a partial cross-sectional view, and FIG. 7B is a front view viewed from the tip direction (arrow E direction). 7A and 7B, a notch 86 is formed in the vicinity of the injection opening 72 of the suction pipe 80. The notch 86 is formed at a position on the periphery of the suction opening 82, so that the operator can visually recognize the distal end portion (jet opening position) of the ejection tube 70.

  Therefore, by providing the notch portion 86 at the distal end portion of the suction tube 80, the operator can directly recognize and operate the distal end portion (ejection opening position) of the ejection tube 70. Therefore, it is possible to inject and excise the fluid to an accurate surgical site.

  In addition, by providing the notch 86, the size of the suction opening 82 can be further supplemented, and the ability to suck and remove the excised tissue can be improved.

  The position of the notch is not limited to the eccentric side of the injection opening 72 as shown in FIG. 7 and may be opposite to the eccentric side of the injection opening 72. Further, the number of notches is not limited to one, and a plurality of notches may be provided. For example, it is possible to provide another notch at a position facing the notch 86 shown in FIG. If a plurality of notches are provided in this manner, the ability to suck the excised tissue at the suction opening can be enhanced.

  DESCRIPTION OF SYMBOLS 1 ... Fluid injection apparatus, 20 ... Pulse flow generation part, 70 ... Injection pipe, 72 ... Injection opening, 80 ... Suction pipe, 81 ... Suction flow path, 82 ... Suction opening

Claims (4)

A pulsating flow generating section that converts fluid into pulsating flow;
A suction pipe projecting from the pulsating flow generating section;
An injection pipe eccentrically inserted into the suction pipe and having an injection opening communicating with the pulsating flow generation section;
A suction flow path formed between an inner peripheral surface of the suction pipe and an outer peripheral surface of the injection pipe, and a suction opening formed at an end of the suction flow path;
The fluid ejecting apparatus, wherein the ejecting opening and the suction pipe are concentrically disposed in the vicinity of the ejecting opening. The fluid ejection device according to claim 1,
The fluid ejecting apparatus, wherein the suction tube and the ejection tube are fixed at least on the ejection opening side of a region where the suction tube and the ejection tube are eccentric. The fluid ejection device according to claim 1 or 2,
The fluid ejecting apparatus according to claim 1, wherein the ejection opening is opened eccentrically with respect to the ejection tube, and a wall portion is formed at a peripheral edge of the ejection opening. In the fluid ejection device according to any one of claims 1 to 3,
The fluid ejecting apparatus according to claim 1, wherein the suction pipe is provided with a notch portion formed around a periphery of the suction opening.

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