JP6135844B2 - Medical powder injection device - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a medical powder injection device used for surgery and the like, and in particular, a medical powder suitably used for treatment by injecting a powder for prevention of adhesion or hemostasis to a tissue. The present invention relates to a body injection device.

  If a tissue such as an organ damaged by a surgical procedure such as surgery or tissue sampling is left unattended, the damaged portion may adhere to surrounding tissues. Such tissue adhesion causes infertility due to tubal adhesion or intestinal obstruction due to intestinal adhesion, which is a heavy burden on the patient, and it is necessary to peel the adhesion part during reoperation. It can also cause new damage to organs. Therefore, conventionally, in order to prevent adhesion in a damaged tissue, a film-like adhesion preventing material that physically covers a wound part during surgery or the like has been used.

  By the way, in recent years, since the burden on patients can be reduced, cases of performing surgical measures such as surgery under an endoscope are increasing.

  However, it has been difficult to use conventionally used film-like anti-adhesive materials for endoscopic surgery or the like. In other words, after film-like anti-adhesive material is rolled up into a small amount and inserted into the body through a trocar, it is possible to apply the anti-adhesive material in the body so as to cover the damaged part. However, there is a problem that the film-like adhesion preventing material is easily cracked and it is difficult to apply the adhesion preventing material to the correct position covering the damaged part.

  In view of such a problem, for example, as described in Japanese Patent Application Laid-Open No. 2007-529280 (Patent Document 1), a powdery adhesion preventing material is used, and adhesion prevention is performed together with pressure gas from a nozzle inserted into the body. It is conceivable to treat the material by injecting it into the damaged part of the body. However, the powdered anti-adhesion material is generally provided in the body as a dry powder, and acts as a gel by hydrating in the body, so it was inserted into the body in a high humidity environment. In the nozzle tip or nozzle, there is a possibility that the powder-like adhesion preventing material may gel due to moisture that has entered the nozzle tip or nozzle. Then, the gelled anti-adhesion material has a problem that the nozzle is narrowed or closed, making it difficult to stably spray the anti-adhesion material onto the target damaged portion.

JP 2007-529280 A

  Here, the present invention has been made in the background as described above, and the problem to be solved is that medical powder such as an anti-adhesion material is introduced into the body together with the pressure gas introduced aseptically. For medical use with a novel structure that can be stably ejected and makes it possible to easily and stably perform treatments such as intended adhesion prevention during endoscopic surgery, for example. An object is to provide an in-vivo injection device for powder.

In order to solve such a problem, the first aspect of the present invention includes an injection passage for injecting the medical powder together with the pressure gas, and switching the supply and stop of the pressure gas to the medical powder. In the in-vivo injection device for medical powder provided with operation means for injecting and stopping the gas, the outer cylinder member is extrapolated to the inner cylinder member that forms the injection passage inside, and has a double cylinder structure. A valve body covering the distal end opening of the inner cylinder member is mounted on the distal end opening of the outer cylinder member, and the valve body is opened in conjunction with the injection and stop of the medical powder by the operating means. And a medical powder in-vivo injection device provided with a closing interlock mechanism.

  In the in-vivo injection device for medical powder according to the present aspect, the tip opening of the inner cylindrical member constituting the passage for injecting the medical powder in a state where the medical powder is not injected, The outer cylinder member is provided to prevent moisture from adhering to or entering the tip or inside of the inner cylinder member. Therefore, for example, even when an inner cylinder member is inserted into the body and medical powder is injected during endoscopic surgery, etc., injection due to gelation of the medical powder at the tip or inside of the inner cylinder member Blockage of the passage is prevented. Since the valve body is opened together with the operation of injecting the medical powder, the medical powder is stably injected into the body through the valve body from the distal end opening of the inner cylinder member. The treatment can be easily and accurately performed.

  According to a second aspect of the present invention, there is provided an in-vivo injection device for medical powder having a structure according to the first aspect, wherein the inner cylindrical member and the outer cylindrical member are relatively movable in the axial direction. The inner cylinder member opens and closes the valve body by the relative movement of the inner cylinder member and the outer cylinder member in conjunction with the injection and stop of the medical powder by the operating means. The mechanism is configured.

  In the in-vivo injection device for medical powder according to this aspect, the axial movement of the inner cylinder member and the outer cylinder member having a double cylinder structure is used to arrange the inner cylinder member at the distal end opening of the outer cylinder member. Since the valve body is opened and closed, the opening and closing operation of the valve body can be reliably performed with a small number of parts and a simple structure. In the present invention, at the time of opening the valve body, it is preferable to position the tip of the inner cylinder member behind the tip of the outer cylinder member, and by covering the tip of the inner cylinder member with the outer cylinder member, Even when the outer cylinder member comes into contact with the tissue, a structure in which the tip of the inner cylinder member is difficult to come into contact with the tissue can be realized.

  According to a third aspect of the present invention, there is provided an in-vivo injection device for medical powder structured according to the first or second aspect, wherein the valve body is elastically restored from an open state to a closed state. On the other hand, in the interlocking mechanism, an opening operating force is exerted on the valve body from the closed state to the open state against the restoring holding force in conjunction with the injection of the medical powder by the operating means. It is supposed to be.

  In the in-vivo injection device for medical powder according to this aspect, the valve body is automatically returned to the closed state and held only by releasing the opening operation force exerted on the valve body. Therefore, the valve body can be reliably closed, and the mechanism for operating the valve body from the open state to the closed state when the injection of the medical powder is stopped can be simplified.

  According to a fourth aspect of the present invention, there is provided an in-vivo injection device for medical powder having a structure according to the third aspect, wherein the interlocking mechanism is interlocked with the injection of the medical powder by the operating means. The inner cylinder member moves relative to the outer cylinder member forward in the axial direction, so that the inner cylinder member exerts the opening operating force on the valve body. .

  In the in-vivo injection device for medical powder according to this aspect, the tip of the inner cylinder member is directly pressed against the valve body, for example, by using the relative movement of the inner cylinder member with respect to the valve body attached to the outer cylinder member. It is possible to reliably open the valve body with a small number of parts, for example, by applying an opening operation force.

  According to a fifth aspect of the present invention, there is provided an in-vivo injection device for medical powder structured according to the third aspect, wherein the interlocking mechanism is interlocked with the injection of the medical powder by the operating means. Thus, an injection pressure of the medical powder is exerted as the opening operation force on the valve body mounted at the distal end opening of the outer cylinder member.

  In the in-vivo injection device for medical powder according to this aspect, the opening pressure can be exerted on the valve body by skillfully using the injection pressure of the medical powder. The interlocking mechanism that opens and closes the valve body in conjunction with the start and stop of the valve can be realized with a simple structure.

  According to a sixth aspect of the present invention, in the medical powder in-body injection device having the structure according to any one of the first to fifth aspects, the medical powder acts on a distal end portion of the inner cylindrical member. A clogging eliminating member for eliminating clogging is provided, and the clogging eliminating member is operated in conjunction with the injection and stop of the medical powder by the operating means.

  In the in-vivo injection device for medical powder according to the present aspect, for example, moisture is released through the valve body that is opened when medical powder is injected or the valve body that is closed when the injection is stopped. Even when the medical powder entering from the portion and gelled is clogged in the inner cylinder member, such clogging can be easily eliminated. Therefore, even when the injection and stop of the medical powder are repeatedly performed, the clogging of the inner cylinder member is realized in conjunction with the stop and restart of the injection of the medical powder, which is troublesome. Stable injection of medical powder can be continuously realized without requiring a clogging elimination operation. The clogging eliminating member is inserted into the tip of the inner cylinder member to directly eliminate clogging, and the clogging is indirectly eliminated by contacting the tip of the inner cylinder member from the outside and deforming it. It may be a member to be made.

  According to a seventh aspect of the present invention, in the medical powder internal injection device having the structure according to the sixth aspect, the inner cylindrical member and the outer cylindrical member are relatively movable in the axial direction. The interlocking mechanism for opening and closing the valve body by the inner cylinder member by relative movement of the inner cylinder member and the outer cylinder member in conjunction with the injection and stop of the medical powder by the operation means. The clogging eliminating member is configured to operate along with the relative movement between the inner cylinder member and the outer cylinder member.

  In the in-vivo injection device for medical powder according to this aspect, the clogging eliminating member provided on the outer cylinder member, for example, is moved relative to the distal end portion of the inner cylinder member using the relative movement between the inner cylinder member and the outer cylinder member. By bringing them into contact or inserting, it is possible to realize clogging elimination operation with a simple structure.

  In the in-vivo injection device for medical powder having a structure according to the present invention, the front end opening of the inner cylinder member to which the medical powder is injected is covered with the outer cylinder member and a valve body attached to the front end. At the same time, when the medical powder is injected, the valve body is opened in conjunction with it, so that the injection of the medical powder from the front end opening of the inner cylinder member is allowed. Therefore, even when the tip of the inner cylinder member is inserted into the body and the medical powder is sprayed, the injection passage is prevented from being clogged due to moisture adhering or entering the tip or inside of the inner cylinder member before injection. Thus, the medical powder can be stably ejected, and the intended treatment such as prevention of adhesion can be easily and accurately performed.

Sectional drawing which shows the whole structure of the in-vivo injection apparatus of the medical powder as the 1st Embodiment of this invention. FIG. 2 is an overall perspective view of the medical powder internal injection device shown in FIG. 1. The perspective view which shows the whole structure of the in-vivo injection apparatus of the medical powder shown by FIG. Sectional drawing corresponding to FIG. 1 which shows the injection state of the internal injection apparatus of the medical powder shown in FIG. The perspective view corresponding to FIG. 3 which shows the injection state of the internal injection apparatus of the medical powder shown in FIG. FIG. 2 is a partially cutaway explanatory view showing an enlarged barrel portion of the medical powder internal injection device shown in FIG. 1. FIG. 7 is a partially cutaway explanatory view showing an injection state in the barrel portion shown in FIG. 6. FIG. 7 is a partially cutaway explanatory view showing another aspect of the barrel portion shown in FIG. 6 as a second embodiment. FIG. 9 is a partially cutaway explanatory view showing an injection state of a barrel portion in the second embodiment shown in FIG. 8. The perspective view which shows the further another aspect in the barrel part shown by FIG. 6 as 3rd Embodiment. The perspective view which shows the injection state of the barrel part in 3rd Embodiment shown by FIG. The perspective view which shows the further another aspect in the barrel part shown by FIG. 6 as 4th Embodiment. The perspective view which shows the injection state of the barrel part in 4th Embodiment shown by FIG. It is a figure which shows the further another aspect in the barrel part shown by FIG. 6 as 5th Embodiment, Comprising: (a) is a perspective view, (b) is a longitudinal cross-sectional view. It is a figure which shows the injection state of the barrel part in 5th Embodiment shown by FIG. 14, Comprising: (a) is a perspective view, (b) is a longitudinal cross-sectional view.

  Embodiments of the present invention will be described below with reference to the drawings. First, FIGS. 1 to 3 show an in-vivo injection device (hereinafter, also referred to as an injection device) 10 for medical powder as a first embodiment of the present invention. The injection device 10 has a substantially pistol shape as a whole. By operating the trigger lever 14 while holding the grip portion 12, the medical powder is injected together with the pressure gas from the tip of the barrel portion 16. It is supposed to be. In the following description, the front-rear direction indicates the left-right direction in FIG. 1 where the barrel portion 16 extends, and the up-down direction indicates the up-down direction in FIG.

  More specifically, the injection device 10 has a grip portion 12 and a body portion 18 constituted by a device body 20 having a hollow structure. Further, the barrel portion 16 extending forward from the body portion 18 has a double cylinder structure including an inner cylinder member 22 and an outer cylinder member 24 that are inserted and removed from each other. Furthermore, a fluid flow path 26 extending from the lower end of the grip portion 12 to the tip of the barrel portion 16 is provided in the injection device 10.

  The base end side portion (grip portion 12 side) of the fluid flow path 26 is configured by a tube 28 and is opened to the outside by a connection port 30 provided at the lower end of the grip portion 12. An external pneumatic line is connected to the connection port 30 so that the proximal end side of the fluid flow path 26 communicates with a positive pressure source such as a compressor or an accumulator. On the other hand, the front end side portion of the fluid flow path 26 is constituted by the inner cylindrical member 22 of the barrel portion 16.

  In addition, an operation means 32 that switches the fluid flow path 26 between a communication state and a shut-off state and a powder supply mechanism 34 that supplies medical powder into the fluid flow path 26 are provided in an intermediate portion of the fluid flow path 26. It has been.

  The operating means 32 includes the lever 14 and the open / close valve 36, and transmits an external operating force applied to the lever 14 to the open / close valve 36, thereby switching the open / close valve 36 and the fluid flow path 26 to open / close. It is like that. As the on-off valve 36, various known structures can be adopted. In this embodiment, the nozzle 40 is inserted into the sealing valve disposed in the opening of the valve housing 38 to insert the inside of the valve housing 38. Is connected to the nozzle 40, while the valve housing 38 is closed and shut off by pulling out the nozzle 40.

  The valve housing 38 is connected to the tube 28 and is fixed inside the upper end of the grip portion 12. On the other hand, the nozzle 40 is fixed to a slide member 42 accommodated in the body portion 18. The slide member 42 is movable in the front-rear direction that is the axial direction of the barrel portion 16. A lever 14 is integrally provided at the lower portion of the slide member 42, and the lever 14 protrudes outward from the body portion 18 downward.

  The slide member 42 is formed with guide projections 44, 44 projecting on both sides near the lower end, and guide projections 46, 46 extending in the front-rear direction on the inner surfaces of the left and right walls of the body portion 18. 44, 44 are slidably engaged. Thus, a guide mechanism for guiding the slide member 42 in the front-rear direction within the body portion 18 is configured.

  A coil spring 48 as an urging means is disposed between the body 18 and the slide member 42. That is, the front end of the coil spring 48 arranged in the front-rear direction in the body portion 18 is locked to the locking piece 50 provided in the body portion 18, and the rear end of the coil spring 48 is the slide member 42. It is latched by the latching piece 52 provided in the. The tensile force of the coil spring 48 is constantly exerted on the slide member 42 toward the front side in the moving direction. Thereby, the slide member 42 is urged toward the front and is elastically positioned to the moving end on the front side, and the slide member 42 can be moved rearward by pulling the lever 14. At the same time, the slide member 42 automatically returns to the moving end on the front side by releasing the operating force on the lever 14.

  The nozzle 40 of the open / close valve 36 is fixed to the rear end portion of the slide member 42 and is disposed to face the valve housing 38. Thus, in a state where no operating force is applied to the lever 14, the nozzle 40 is pulled away from the valve housing 38 and the open / close valve 36 is held in a shut-off state. On the other hand, when the lever 14 is pulled, the nozzle 40 is inserted into the valve housing 38 and the open / close valve 36 is brought into a communication state.

  The powder supply mechanism 34 includes a holding member 54 assembled between the slide member 42 and the inner cylinder member 22 in the body portion 18. The holding member 54 is formed with a relay flow path 56 extending in the front-rear direction. The front end of the relay flow path 56 is connected to the rear end of the inner hole of the inner cylinder member 22, while the relay flow path 56. The rear end is connected to the nozzle 40. As a result, the tube 28 and the inner hole of the inner cylindrical member 22 are connected to each other through the relay flow path 56, and the fluid flow path 26 extending from the lower end of the grip portion 12 to the tip of the barrel portion 16 as a whole is configured. Has been.

  The rear end portion of the relay flow path 56 is configured by a flexible tube body, and the movement of the nozzle 40 in the front-rear direction relative to the holding member 54 accompanying the displacement of the slide member 42 is such a flexible tube. It is allowed by the deformation of the tube.

  Further, the holding member 54 is provided with a container holder 58 exposed upward from the body portion 18, and a powder container 60 containing medical powder can be attached to the container holder 58. Yes. The powder container 60 has various shapes and sizes depending on the type of medical powder to be used, and the shape and size of the container holder 58 is also the same as the powder container 60 to be employed. It is set accordingly. In particular, in the present invention, the medical powder to be used is not limited. For example, the powder can be applied to medical powder such as a hemostatic material and various drugs in addition to the adhesion preventing material described in Patent Document 1. Accordingly, the powder container 60 and the container holder 58 to be employed can be set as appropriate.

  Further, the holding member 54 is formed with a powder supply path 62 extending from the formation portion of the container holder 58 toward the relay flow path 56. Then, by attaching the powder container 60 to the container holder 58 with the opening facing downward, the inside of the powder container 60 is communicated with the relay flow path 56 through the powder supply path 62, and the powder container 60. The medical powder accommodated in the tube is supplied to the relay flow path 56.

  Note that the connecting portion of the powder supply path 62 in the relay flow path 56 is narrowed compared to the front and rear flow path portions, and medical powder is guided into the relay flow path 56 using the venturi action. It can be put in.

  In addition, a pressure supply path 64 extending in parallel with the powder supply path 62 is formed in the holding member 54. Then, the pressure in the relay flow path 56 located on the upstream side of the connecting portion of the powder supply path 62 is applied to the powder container 60 mounted on the container holder 58 through the pressure supply path 64. ing.

  Furthermore, the holding member 54 is equipped with a vibration mechanism 66. As this vibration mechanism 66, for example, a known one disclosed in JP 2012-143502 A can be employed. That is, an eccentric rotating body 68 is assembled to the lower portion of the holding member 54 so as to be rotatable around the central axis, and the branch passage 70 branched from the upstream side of the connecting portion of the powder supply passage 62 in the relay passage 56. The eccentric rotating body 68 is rotationally driven by the fluid pressure exerted through the shaft. Here, the eccentric rotator 68 has its center of gravity set eccentric from the rotation center axis, and fluid pressure is exerted on the sawtooth pressure receiving surface provided on the outer peripheral surface to rotate around the rotation center axis. Thus, the powder container 60 mounted on the holding member 54 is vibrated at a frequency corresponding to the rotation period. Then, the powder container 60 is vibrated to prevent clogging or clogging of the medical powder inside the powder container 60, the powder supply path 62, etc., and to relay the medical powder as described above. Supply to the flow path 56 is realized more stably.

  Thus, in the injection device 10 of the present embodiment having the fluid flow path 26 in which the operation means 32 and the powder supply mechanism 34 are provided in the intermediate portion, the grip portion 12 is simply grasped and the lever 14 is pulled. The medical powder contained in the powder container 60 can be ejected from the tip opening of the inner cylinder member 22 by one-hand operation. That is, when the lever 14 is pulled, the open / close valve 36 held in the closed state is opened, and the entire length of the fluid flow path 26 is brought into communication, and accordingly, the eccentric rotator 68 is rotated and added. While the vibration force is continuously generated, the medical powder in the powder container 60 is gradually fed into the fluid flow path 26 and the inner cylinder member 22 together with the pressure gas flowing through the fluid flow path 26. Will be ejected to the outside through the tip opening. On the other hand, when the operating force of the lever 14 is released, the open / close valve 36 held in the open state is closed and the fluid flow path 26 is shut off. Thereby, since supply of the pressure gas into the fluid flow path 26 is stopped, injection of the medical powder to the outside is also stopped.

  In short, the fluid channel 26 is switched between the communication state and the blocking state by the operation means 32. In other words, supply and stop of the pressure gas in the injection device 10 are switched by the operation means 32. Here, the medical powder is ejected when the fluid flow path 26 is in a communicating state, and the injection of the medical powder is stopped when the fluid flow path 26 is in a blocked state. 32 also switches the injection and stop of injection of medical powder.

  As is clear from this, in this embodiment, the medical powder is injected into the external space together with the pressure fluid by the inner hole of the inner cylindrical member 22 that forms the downstream portion of the fluid flow path 26. An injection passage is configured. In the present embodiment, a torsion plate-shaped rectifying plate 72 is assembled to the distal end opening of the inner cylindrical member 22 in an accommodated state. The jet fluid is guided along the torsional surface of the rectifying plate 72 and jetted to the outside while being swirled in a spiral shape, whereby the medical powder to be sprayed is centrifuged based on a spiral-shaped rotating action. The force is exerted so that the medical powder is diffused and sprayed uniformly over a wider range.

  Further, in the injection device 10 of the present embodiment, in the barrel portion 16 having a double cylinder structure, the outer cylinder member 24 externally inserted to the inner cylinder member 22 moves relative to the inner cylinder member 22 in the axial direction. It is possible. That is, a cylindrical support member in which the proximal end side of the inner cylindrical member 22 is inserted into the body portion 18 and fixed to the holding member 54 and is movable in the axial direction on the outer peripheral side of the inner cylindrical member 22. 74 is incorporated. The proximal end side of the outer cylinder member 24 is inserted into the body portion 18 and is fitted into the support member 74 and fixed.

  Further, the support member 74 is integrally connected to the slide member 42 by a rod-shaped connecting portion 76 extending in the front-rear direction on the side of the holding member 54. As a result, the support member 74 and thus the outer cylinder member 24 are moved in the front-rear direction, which is the axial direction, in accordance with the movement operation of the slide member 42 in the front-rear direction by the lever 14.

  That is, when the operating force is not exerted on the lever 14 and the fluid flow path 26 is positioned in the front where the slide member 42 is positioned, the outer cylinder member 24 is held at the moving end on the front side, while the lever 14 is When the pulling operation force is exerted and the fluid flow path 26 is brought into a communication state, the outer cylinder member 24 is also relative to the body 18 and the inner cylinder member 22 as the slide member 42 moves rearward. To move backwards.

  Furthermore, the outer cylinder member 24 has a tip extending forward from the inner cylinder member 22 at least in a state of being held at the moving end toward the front side, and a tip portion of the inner cylinder member 22 is the outer cylinder portion. The tube member 24 is completely covered.

  A valve body 78 is attached to a front end opening portion of the outer cylinder member 24 extending forward from the inner cylinder member 22, and the valve body 78 of the outer cylinder member 24 allows the inner cylinder member 22 to The tip opening is covered with respect to the external space.

  The valve body 78 may be anything that can be controlled to open and close by an interlocking mechanism that is opened and closed in conjunction with the injection and stop of the medical powder by the operation of the operating means 32 including the lever 14. Although not particularly limited, in this embodiment, a slit valve 80 is employed as shown in FIG. The slit valve 80 has a structure in which a radial slit 82 is provided for an elastic body such as rubber having a disk shape with a predetermined thickness, and is fitted into the opening of the outer cylinder member 24. The outer peripheral surface of the outer cylindrical member 24 is fixed to the inner peripheral surface of the outer cylindrical member 24 in a state of spreading in the direction perpendicular to the axis and blocking the opening of the outer cylindrical member 24.

  The slit valve 80 is elastically deformed when the central portion is pushed and the slit 82 is opened and opened, and when the force applied to the central portion is released, the slit 82 is kept closed by an elastic restoring holding force. It is. Therefore, the outer cylinder member 24 moves backward with respect to the inner cylinder member 22 in conjunction with the injection operation of the medical powder by pulling the lever 14, and the inner part with respect to the central portion of the slit valve 80. The front end surface of the cylindrical member 22 is pressed. Along with this, the slit 82 opens against the restoring holding force of the slit valve 80, and the tip opening of the inner cylinder member 22 is exposed to the external space, so that the slit valve of the tip opening of the inner cylinder member 22 is exposed. 80 is subjected to an opening operating force that shifts from the closed state to the open state. In particular, in this embodiment, as shown in FIG. 7, the outer cylinder member 24 moves backward with respect to the inner cylinder member 22, that is, the inner cylinder member 22 is axially forward with respect to the outer cylinder member 24. Relative to each other, the tip of the inner cylindrical member 22 penetrates the slit valve 80 and protrudes outward, so that the inner cylindrical member 22 exerts an opening operating force on the slit valve 80. It has come to affect.

  Thereby, the outer cylinder member 24 is moved backward with respect to the inner cylinder member 22 by pulling the lever 14 to perform the injection operation of the medical powder. In conjunction with this, the slit valve 80 that has been kept so as to cover the opening of the inner cylinder member 22 in a closed state is opened, and there is no need to perform a separate opening operation of the valve body. Injection can be performed. Further, when the operation force to the lever 14 is released, the outer cylinder member 24 returns and moves relatively forward with respect to the inner cylinder member 22 based on the biasing force of the coil spring 48, and the inner cylinder member 22. Thus, the pressing force to the slit valve 80 is released, and the slit valve 80 covering the tip opening of the inner cylinder member 22 is held in the closed state again.

  As is clear from this, in the present embodiment, the slit valve 80 that is closed by an elastic restoring holding force, and the inner cylinder member 22 and the outer cylinder member 24 are interlocked with the operation of the lever 14. Including a mechanism that causes the distal end of the inner cylindrical member 22 to abut against the slit valve 80 to exert an opening operation force by relative displacement, and opens and closes the slit valve 80 in conjunction with the injection and stop of medical powder. An interlocking mechanism is configured.

  That is, in the present embodiment, the distal end side is covered with the valve body 78 from the opening of the inner cylindrical member 22 inner hole, which is an injection passage, and the valve body 78 covers the external space, that is, the space in the abdominal cavity at the time of treatment. The communication state of all the injection passages is controlled. In particular, in the present embodiment, the inner hole of the inner cylinder member 22 is communicated with the inner space of the outer cylinder member 24, and the valve body 78 is provided at the distal end portion of the outer cylinder member 24. Accordingly, the inner space of the outer cylinder member 24 is communicated with and blocked from the outer space, whereby the opening and closing of the injection passage are realized.

  Here, in the present embodiment, the apparatus main body 20, the inner cylinder member 22, the outer cylinder member 24, and the like can be suitably employed as a hard material, for example, a synthetic resin. Further, as the tube 28 and the like, an elastic material such as rubber can be suitably employed.

  In the medical powder injection device 10 having the above-described structure, the distal end opening portion of the inner cylindrical member 22 that becomes the medical powder injection port until the lever 14 is pulled to inject the medical powder. Is covered with the slit valve 80 and is substantially blocked from the external space. For example, when performing an operation under an endoscope, even if the tip of the barrel portion 16 is inserted into the abdominal cavity, moisture such as body fluids, etc. Is prevented from entering the fluid flow path 26 from the front end opening of the inner cylinder member 22.

  Therefore, when the medical powder is sprayed to a predetermined site in the body by pulling the lever 14, the problem is that the medical powder is gelled by the moisture that has entered the inner cylinder member 22 and the injection is hindered. It is effectively prevented, and the target medical powder injection treatment can be stably performed. In particular, even when the injection of the medical powder is repeated in several times, each time the operating force on the lever 14 is released and the injection of the medical powder is stopped, the tip opening of the inner cylindrical member 22 is opened. The slit valve 80 holds the closed state. Therefore, even when the medical powder is repeatedly ejected and stopped with the tip of the barrel portion 16 inserted into the abdominal cavity, the medical powder is clogged due to the intrusion of body fluid into the inner cylindrical member 22. Is prevented, and a stable medical powder injection treatment can be performed.

  In this embodiment, since the slit valve 80 is directly pushed open by the inner cylinder member 22, the opening operation of the slit valve 80 can be reliably performed with a simple structure when the medical powder is injected. Can be realized.

  Furthermore, in this embodiment, the entire inner cylinder member 22 constituting the injection flow path is covered with the outer cylinder member 24, and the front end opening of the outer cylinder member 24 is closed by the slit valve 80. It has become. As a result, even if body fluid or the like passes through the slit valve 80, it enters the outer cylinder member 24, but does not immediately enter the inner cylinder member 22, and the clogging of the injection flow path is more effective. To be prevented.

  The valve body 78 that is employed in the present invention and blocks the tip opening of the injection flow path is not limited to the slit valve 80 illustrated in the first embodiment. For example, even when a similar slit valve is employed, the resistance force at the time of opening the slit valve and the holding force to the closed state can be adjusted by appropriately increasing or decreasing the number of slits formed radially. Is possible. Specifically, as shown in FIGS. 8 to 9, the slit valve 84 as the second embodiment in which more slits 82 are formed than the slit valve 80 illustrated in the first embodiment, It is also possible to employ in the present invention. In the following description of the second embodiment, members and parts that are substantially the same as those of the first embodiment will be described in detail by assigning the same reference numerals as those of the first embodiment to the drawings. Is omitted.

  Moreover, it is also possible to employ a butterfly on-off valve instead of the slit valve. Specifically, as shown in FIGS. 10 to 11, the two valve doors 86, 86 having a double door structure have hinge support pivots 88, 88, and the opening edge of the outer cylinder member 24. An on-off valve 90 as a valve body having a structure attached to the part so as to be openable and closable may be employed. The on-off valve 90 is provided with urging means for elastically holding each valve door 86 to the closed position. Such urging means is realized, for example, by providing a torsion spring or the like for the rotation support portion 88. In addition, although the elastic body is employ | adopted as the slit valves 80 and 84 in the said 1st and 2nd embodiment, as the valve door 86 of this embodiment, the hard synthetic | combination which can be employ | adopted as the apparatus main body 20 grade | etc., Is used. Resins and the like can be suitably employed.

  Such valve doors 86, 86 are configured such that, for example, the inner cylinder member 22 and the outer cylinder member 24 are relatively displaced in the axial direction as in the first embodiment, so that the front end surface of the inner cylinder member 22 becomes the valve doors 86, 86. It can be opened by pressing. In addition, as shown in FIG. 11, by directly blowing the pressure gas injected from the tip opening of the inner cylinder member 22 against the inner surfaces of the valve doors 86, 86, the valve door 86 is pressurized. , 86 can be opened and held in the open state.

  In this way, by using the injection pressure of the pressure gas of the medical powder as the opening operation force of the on-off valve 90, the inner cylinder member 22 and the outer cylinder member 24 are relatively moved as in the first embodiment. The opening / closing valve 90 can be opened in conjunction with the medical powder ejection operation by the lever operation 14 and the on-off valve 90 interlocked with the medical powder ejection stop can be returned to the closed state. It becomes possible to hold. Therefore, an interlocking mechanism that opens and closes the valve body in conjunction with the injection and stop of the medical powder by the operation of the lever 14 can be realized with a simple structure as compared to the first embodiment.

  In addition, it replaced with the on-off valve 90 provided with a pair of valve doors 86 and 86 in the said 3rd Embodiment, and was equipped with one valve door 92 of the door structure as shown in FIGS. It is also possible to employ an on-off valve 94. Also in the on-off valve 94 as the fourth embodiment, as in the third embodiment, the biasing means for elastically restoring and holding the valve door 92 in the closed state, for example, the valve door 92 can be rotated. By assembling it to the rotation support part 96 that supports it, it can operate in the same manner as in the third embodiment.

  Further, in FIGS. 14 to 15, an injection device 98 as a fifth embodiment of the present invention is shown at the distal end portion of the barrel portion 16 which is a main portion thereof. The injection device 98 of the present embodiment can employ the same structure as that of the first embodiment as its basic structure. Further, in the injection device 98 of the present embodiment, the valve body formed at the opening tip portion of the outer cylinder member 24 is, for example, the slit valves 80 and 84 and the on-off valves exemplified in the first to fourth embodiments. Since 90 and 94 can be adopted, the illustration of the valve body is omitted.

  That is, in the injection device 98 of the present embodiment, as shown in FIGS. 14 (a) and 14 (b) showing the closed state of the valve body where the lever 14 is not operated, the distal end opening of the outer cylinder member 24 is shown. In FIG. 2, an insertion member 100 as a clogging eliminating member is assembled. The insertion member 100 of the present embodiment has a structure in which a cross bar 104 extending radially is integrally formed in an annular fixed portion 102.

  The insertion member 100 is disposed in the outer cylinder member 24 behind the slit valve (not shown) and ahead of the front end surface of the inner cylinder member 22. Then, by fixing the fixing portion 102 to the inner peripheral surface of the outer cylinder member 24, the cross bar 104 is arranged in the radial direction perpendicular to the outer cylinder member 24.

  On the other hand, four slits 106 extending in the axial direction at four locations on the circumference are formed at the distal end portion of the inner cylindrical member 22 so as to extend in the axial direction from the distal end surface. Each of these four slits 106 is provided at a position facing the cross bar 104 of the insertion member 100 in the axial direction.

  Further, the position of the insertion member 100 in the outer cylinder member 24 is determined such that the inner cylinder member 22 is displaced forward in the axial direction relative to the outer cylinder member 24 when the lever 14 is pulled to perform the injection operation. In this case, the front end surface of the inner cylinder member 22 is set to the rear side relative to the relative forward end position in the outer cylinder member 24.

  As a result, when the inner cylinder member 22 is moved relatively forward in the outer cylinder member 24 as the lever 14 is pulled, the outer cylinder member 22 is moved as shown in FIGS. 15 (a) and 15 (b). The cross bar 104 of the insertion member 100 provided in the cylindrical member 24 is inserted into the inner cylindrical member 22 to a position with a predetermined depth in the inner cylindrical member 22 through each slit 106 of the inner cylindrical member 22.

  In such an injection device 98 of the present embodiment, even when gelation occurs in the distal end portion of the inner cylindrical member 22 during injection of medical powder as shown in FIG. The inner cylinder member 22 is moved rearward relative to the outer cylinder member 24 in conjunction with the release of the operating force and stopping the injection. As a result, the cross bar 104 inserted from the front end portion of the inner cylinder member 22 moves to the front of the inner cylinder member 22 and is pulled out, so that clogging at the front end opening of the inner cylinder member 22 is pushed out by the cross bar 104. It can be resolved.

  Further, even if the medical powder in the form of gel is clogged at the tip opening portion of the inner cylinder member 22 in the injection stop state of the medical powder as shown in FIG. 14, the lever 14 is pulled. When the injection operation is performed, the insertion member 100 works in conjunction with the medical powder that is inserted into the inner cylindrical member 22 and becomes a gel. As a result, clogging of the inner cylinder member 22 can be prevented in advance, or it can be easily eliminated by removing it with a pressure gas injection pressure in a state where it is cut into small pieces. The injection operation can be performed more stably.

  As mentioned above, although embodiment of this invention has been explained in full detail, this invention is not limitedly interpreted by the specific description in this embodiment. For example, in addition to the insertion member 100 provided with the cross bar 104 illustrated in the fifth embodiment, as an anti-clogging member, for example, an appropriate number of protrusions are provided on the inner surface of the outer cylinder member 24 so that the medical powder It is also possible to adopt a structure in which the protrusions cause the distal end portion of the inner cylinder member 22 to be pressed and deformed from the outer peripheral surface with the relative movement of the inner cylinder member 22 and the outer cylinder member 24 in the axial direction at the time of injection. is there. That is, the protrusions elastically deform the inner cylindrical member 22 during the injection of the medical powder, and release the pressing force by the protrusions on the inner cylindrical member 22 when the injection is stopped. By restoring elastically to the original shape, it is possible to prevent or eliminate clogging of the inner cylindrical member 22 by utilizing such deformation of the peripheral wall portion of the inner cylindrical member 22.

  Further, as the interlocking mechanism that opens and closes the valve body in conjunction with the injection and stop of the medical powder by the operation means 32, an electrical interlocking mechanism can be adopted in addition to the mechanical interlocking mechanism as illustrated. . That is, the operation of the lever 14 is detected by an electrical contact or a sensor, and the pressure valve that switches supply and stop of the pressure gas and the valve body that covers the tip opening of the inner cylinder member are opened and closed by an actuator or the like, respectively. It is also possible to employ a mechanism that operates.

  Furthermore, as described above, the interlocking mechanism that relatively moves the inner cylinder member 22 and the outer cylinder member 24 constituting the injection passage in response to the switching operation by the operation means 32 is a mechanical interlocking mechanism as illustrated. In addition, an electrical interlocking mechanism can be employed. Further, as the mechanical interlocking mechanism, one of the inner cylindrical member 22 and the outer cylindrical member 24 as illustrated is directly moved by the lever 14, and the inner cylindrical member is connected via a transmission mechanism such as a rack and pinion or a link. An interlocking mechanism that relatively moves one or both of the outer cylinder member 22 and the outer cylinder member 24 with an operation lever or the like may be employed.

  Further, in the above embodiment, the opening operation by direct contact and the opening operation by pressure action are exemplified for the valve body, and both of them are restored to the closed state by the restoring holding force. For example, the actuating force of the relative movement of the inner cylinder member 22 and the outer cylinder member 24 is exerted in both the opening direction and the closing direction of the valve element by a rack and pinion mechanism, a link mechanism, etc., thereby forcibly opening and closing the valve element. It can also be realized.

  Furthermore, in the first embodiment, the tip of the inner cylinder member 22 directly contacts the valve body 78 to exert an opening operation force. For example, a link member that opens and closes the valve body 78 Etc., the inner cylinder member 22 may drive the valve body 78 so that an opening operation force is indirectly exerted.

  Furthermore, in the fifth embodiment, the insertion member 100 is disposed behind the slit valve and ahead of the front end surface of the inner cylinder member 22, but is limited to this mode. Is not to be done. That is, the insertion member 100 may be disposed in front of the slit valve.

  In the present invention, the vibration mechanism 66 is not essential. Even when the vibration mechanism is adopted, it is not necessary to link the excitation of the injection device 10 by the vibration mechanism and the injection of the medical powder, and the vibration mechanism may be configured using, for example, an electric motor other than the pressure gas. good.

  Furthermore, in the present invention, it is only necessary that the opening tip portion of the inner cylinder member 22 is covered by the valve body disposed on the outer cylinder member 24. For example, the outer cylinder member that covers only the opening tip portion of the inner cylinder member 22 is used. 24 can also be adopted, and the outer cylinder member 24 does not need to cover the entire inner cylinder member 22 as shown in the above embodiment.

10, 98: Medical powder injection device, 14: Lever, 22: Inner cylinder member, 24: Outer cylinder member, 32: Operating means, 36: Open / close valve, 78: Valve body, 80, 84: Slit valve , 90, 94: On-off valve, 100: Insertion member (clogging elimination member)

Claims (7)

The medical powder body includes an injection passage for injecting the medical powder together with the pressure gas, and provided with operation means for switching the supply and stop of the pressure gas to inject and stop the medical powder. In the injection device,
The inner cylinder member which forms the said injection passage is made into the double cylinder structure by which the outer cylinder member was extrapolated, and the valve body which covers the front-end | tip opening part of this inner cylinder member is a front-end | tip opening part of this outer-cylinder member And a mechanism for opening and closing the valve body in conjunction with the spraying and stopping of the medical powder by the operating means. Injection device. The inner cylinder member and the outer cylinder member are movable relative to each other in the axial direction;
The interlocking mechanism for opening and closing the valve body by the inner cylinder member by relative movement of the inner cylinder member and the outer cylinder member in conjunction with the injection and stop of the medical powder by the operation means. The medical powder in-vivo injection device according to claim 1 configured.   While the valve body has an elastic restoring and holding force from the open state to the closed state, in the interlocking mechanism, the valve body is restored and held in conjunction with the injection of the medical powder by the operating means. The medical powder in-vivo injection device according to claim 1 or 2, wherein an opening operation force from the closed state to the open state is exerted against the medical device.   In the interlocking mechanism, the inner cylindrical member moves relative to the outer cylindrical member in the axial direction relative to the outer cylindrical member in conjunction with the injection of the medical powder by the operating means, whereby the inner cylindrical member is The medical powder internal injection device according to claim 3, wherein the opening operating force is exerted on the valve body.   In the interlocking mechanism, the injection pressure of the medical powder is applied to the valve body attached to the distal end opening of the outer cylinder member in conjunction with the injection of the medical powder by the operation means. The medical powder in-vivo injection device according to claim 3, which is applied as power.   A clogging eliminating member that acts on the distal end portion of the inner cylinder member to eliminate clogging of the medical powder is provided, and the clogging is performed in conjunction with the injection and stop of the medical powder by the operation means. The medical powder in-vivo injection device according to any one of claims 1 to 5, wherein the elimination member is operated. The inner cylinder member and the outer cylinder member are movable relative to each other in the axial direction;
The interlocking mechanism for opening and closing the valve body by the inner cylinder member by relative movement of the inner cylinder member and the outer cylinder member in conjunction with the injection and stop of the medical powder by the operation means. Configured,
The medical powder in-vivo injection device according to claim 6, wherein the clogging eliminating member is operated in accordance with relative movement between the inner cylinder member and the outer cylinder member.

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