JPH08150202A - Treating device for injecting injectant - Google Patents

Abstract

PURPOSE: To provide a treating device for injecting injectant capable of surely injecting a small quantity of an injectant without requiring a wasteful content, by injecting a medicine or the like into a patient's body through an injection needle from an injectant containing means near the needle portion of an injection needle. CONSTITUTION: An inner metal cap 8 of an inner sheath 5 is pushed into an outer cap 6 of an outer sheath 4, and the injection needle 9 is projected from the front end small diameter opening 7 of the outer sheath 4. Then, the injection needle 9 is dipped in a medicine p to suck by a syringe attached to the inner metal cap 8, and the medicine p is filled into the tube of the injection needle 9. Thereafter, by pulling the inner metal cap 8 toward yourself relative to the outer metal cap 6, the injection needle 9 is led into the outer sheath 4. An inserting portion 2 of a treating device 1 is inserted into a position for treatment through an endoscope channel. Then, the injection needle 9 is projected from the inner metal cap 8 to be inserted into an affected part. By using the syringe of the inner metal cap 8, air is injected into the inner sheath 5. The air passes through a gas passage film 10, pushing out the medicine p inside the injection needle 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a treatment instrument for injecting an injectate which is inserted endoscopically into a patient's body and injects an injectate such as a drug locally in a body cavity.

[0002]

2. Description of the Related Art In general, for example, the actual Kaihei 1-68052
As disclosed in Japanese Patent Publication No. 3-15081 and Japanese Utility Model Publication No. 3-15081, there is known an injection needle for an endoscope which is used by being inserted endoscopically into a patient's body. In this type of treatment tool, an injection needle made of a tubular body is arranged at the tip of the insertion portion to be inserted into the body cavity of the patient.

One end of an elongated connecting tube is connected to the base end of the injection needle. The other end of the connecting tube extends to the proximal end side of the insertion portion and is connected to the proximal connecting end held outside the patient's body. Furthermore, an injector for injecting an injectate such as a drug, for example, a syringe or the like is connected to the connection end on the proximal side.

When the treatment instrument is used, an injection needle inserted into the patient's body endoscopically is punctured in the tissue to be treated in the body cavity, and an injectate such as a drug is injected with the operation of the syringe. Is pumped to the injection needle side through the connection tube, and is further locally injected into the tissue to be treated through the tube of the injection needle.

[0005]

In the injection needle having the above-mentioned conventional structure, the drug is further fed from the hand side by a syringe or the like while the drug is filled over the entire length of the drug injection conduit in the connecting tube of the injection needle. As a result, the drug is injected into the tissue to be treated through the tube of the injection needle. Therefore, after the injection of the drug, the drug remains in a filled state over the entire length of the drug injection line in the connection tube,
At this time, the drug remaining in the connection tube is not actually used and is wasted.

As a result, the volume of the drug used in one drug injection operation is necessarily larger than the volume of the drug actually required for the treatment, so that a small amount of the expensive drug is injected into the tissue to be treated. When injecting, there is a problem that a wasteful capacity becomes remarkably large for a very small amount of injection.

[0007] In particular, in recent years, gene therapy has been performed in which a drug containing an expensive gene is injected into a target tissue in a patient's body using an endoscope injection needle. Here, since the injection amount of the drug containing the gene to be injected into the tissue to be treated in the patient's body is very small, the drug containing the gene that is extremely expensive when using the above-mentioned conventional endoscope injection needle is used. However, it is not used in a large amount and remains, which is a big cost problem.

The present invention has been made in view of the above circumstances, and an object thereof is to reliably treat a tissue to be treated in a patient's body without requiring a wasteful volume of an injectate such as a drug in a smaller amount than in the past. The object of the present invention is to provide a treatment tool for injecting an injectable substance that can be injected into a body.

[0009]

[Means for Solving the Problems] An injection needle for injecting an injectate such as a drug is provided at the tip of an insertion part to be inserted into a body cavity, and the injectate is injected into a tissue in a body through the injection needle. In the treatment instrument for injecting a drug or the like, an injectate accommodating means for accommodating the injectate is provided only near the needle portion of the injection needle.

[0010]

[Function] At the time of injecting an injectate such as a drug, the injectate such as a drug is injected into the tissue to be treated in the patient's body from the injectate accommodating means near the needle part of the injecting needle to inject the needle of the injecting needle. Only the amount of the injectate stored in the injectate storage means in the vicinity is used, and the volume of the injectate that is wastefully left on the treatment tool side is reduced, so that the amount of the injectate such as an expensive drug used can be minimized. It was done like this.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows a schematic configuration of the entire treatment instrument 1 for drug injection. Reference numeral 2 is an insertion portion of the treatment instrument 1 which is inserted into a body cavity of a patient, and 3 is connected to a proximal end portion of the insertion portion 2. And the connection end on the proximal side that is held outside the patient's body.

Here, the insertion portion 2 is provided with an outer sheath 4 and an inner sheath 5 inserted into the outer sheath 4 so as to be movable back and forth in the axial direction. Further, the proximal end of the outer sheath 4 is fixed to the distal end side of the outer cap 6 arranged at the proximal connecting end 3. Further, a small diameter port 7 having a reduced inner diameter is formed at the tip of the outer sheath 4.

The proximal end of the inner sheath 5 is fixed to the distal end side of the inner mouthpiece 8 arranged at the proximal connecting end 3. Further, an injection needle 9 made of a tubular body is fixed to the tip of the inner sheath 5. The injection needle 9 is adapted to be retracted and retracted from the small diameter port 7 at the tip of the outer sheath 4 as the inner sheath 5 moves forward and backward.

As shown in FIG. 2, a gas passage membrane 10 is fixed to the proximal end of the injection needle 9 in a state of closing the entire proximal opening of the injection needle 9. The gas permeable membrane 10 is made of a thin film material that is permeable to gas but impermeable to liquid, for example, GORE-TEX (trade name) manufactured by GORE-TEX Japan. Further, an injectate accommodating portion (injectate accommodating means) 11 for accommodating an injectate such as a liquid medicine p is formed in the tube of the injection needle 9.

The liquid drug p which is an injectate includes a therapeutic drug, a test drug, a therapeutic gene for introduction into cells of a patient, and the like. Here, the therapeutic gene may be a liposome encapsulating this gene, or one in which this gene is incorporated into a retrovirus.

Next, the operation of the above configuration will be described.
First, the inner mouth ring 8 of the inner sheath 5 is pushed into the outer mouth ring 6 of the outer sheath 4 toward the tip side to cause the injection needle 9 to project from the small-diameter mouth 7 at the tip of the outer sheath 4 as shown in FIG. In this state, the injection needle 9 is dipped in the liquid medicine p that is the injection material, and suction is performed with a syringe (not shown) attached to the inner mouthpiece 8 on the proximal side of the inner sheath 5. At this time, the gas permeable membrane 10 at the proximal end of the injection needle 9 is impermeable to liquid, so that the drug p is inhaled and filled only in the tube of the injection needle 9.

After the medicine p is filled into the tube of the injection needle 9, the inner needle 8 of the inner sheath 5 is pulled toward the outer mouth 6 of the outer sheath 4 to pull the needle 9 at the distal end. The small-diameter opening 7 is drawn into the inner side of the outer sheath 4. In that state, the insertion portion 2 of the treatment instrument 1 is inserted into a channel of an endoscope (not shown). Then, with the distal end portion of the insertion portion 2 of the treatment instrument 1 being guided to the vicinity of the treatment target location through the channel of the endoscope, the inner mouthpiece 8 of the inner sheath 5 is tipped to the outer mouthpiece 6 of the outer sheath 4. The injection needle 9 projects from the small-diameter opening 7 at the distal end by pushing the injection needle 9 to the side, and the injection needle 9 is inserted into the affected part in the body cavity of the patient in the same manner as a known injection needle.

Then, by operating a syringe (not shown) attached to the inner mouth ring 8 on the proximal side of the inner sheath 5 to inject air from the inner mouth ring 8 into the inner sheath 5, the injection needle 9 is introduced.
The liquid drug solution filled in the tube of the injection needle 9 is pushed out to the outside by the air that has passed through the gas passage film 10 at the end portion on the proximal side.

Therefore, the following effects can be obtained with the above-mentioned structure. That is, the injection material is filled only in the tube of the injection needle 9 arranged at the tip of the elongated insertion portion 2 of the treatment instrument 1, and only the injection material filled in the tube of the injection needle 9 is injected at the time of injecting the injection material. Since the drug can be released to the outside of the needle 9, the volume of the drug p used in one drug injection operation can be the amount stored in the tube of the injection needle 9. Therefore, as in the conventional case, the volume of the injectate that is wastefully left in the drug supply conduit on the side of the treatment tool 1 can be significantly reduced by one-time drug injecting operation. You can use the minimum amount of.
Therefore, even when the expensive drug p such as a gene is used, there is no waste, which is advantageous in terms of cost.

FIG. 3 shows a second embodiment of the present invention. This is an injection needle connecting body 1 in which a relatively short tip of a connecting tube 12 is connected to the proximal end of the injection needle 9.
3 is formed, and an injectate container (injectate container means) 14 for containing an injectate such as a liquid medicine p is formed inside the injection needle connecting body 13.

In this case, a relatively short base end of the connecting pipe 15 is fixed to the front end of the inner sheath 5. The proximal end portion of the connection tube 12 of the injection needle coupling body 13 is detachably connected to the distal end portion of the connection pipe 15. The other parts are the same as those in the first embodiment.

In the above structure, the injectate accommodating portion 14 of the injecting needle connecting body 13 is filled with an injectate such as a liquid medicine p in advance, and then the injecting needle connected body in which the injectate is filled. 13 is connected to the connection pipe 15 of the inner sheath 5.
In addition, as in the first embodiment, by injecting air into the inner sheath 5 from the inner mouthpiece 8 by operating a syringe (not shown) attached to the inner mouthpiece 8 on the proximal side of the inner sheath 5. The liquid drug solution filled in the injectate container 14 of the needle connecting body 13 is pushed out to the outside.

Therefore, in the above-mentioned structure, since the injection needle connecting body 13 connected to the connecting pipe 15 of the inner sheath 5 is replaceable, the used injection needle connecting body 1 is replaced.
3 can be easily replaced with a new injection needle connector 13. Therefore, a new injection needle 9 can always be used when injecting an injectate such as the drug p, which has the effect of improving safety.

The inner sheath 5 of the second embodiment is filled with physiological saline in advance, and a syringe (not shown) filled with physiological saline is used as the inner mouthpiece of the inner sheath 5 on the proximal side. 8 and by operating this syringe to inject physiological saline into the inner sheath 5 from the inner mouthpiece 8, the liquid medicinal solution filled in the infusate accommodating portion 14 of the infusion needle connector 13 is externally supplied. You may make it the structure pushed out to the side.

4 to 6 show a third embodiment of the present invention. This is applied to the endoscope drug implement 21 as a treatment tool for injecting an injectate. A flexible elongated rod 23 made of, for example, a fluororesin is provided in the insertion portion 22 of the endoscope drug delivery tool 21. A screw hole 23a is formed at the tip of the rod 23. A needle-shaped tip 24 forming an injection needle is removably screwed and fixed in the screw hole 23a.

As shown in FIG. 5, the tip 24 has a substantially cone-shaped tip body 25 and a male screw portion 26 projecting from the base end of the tip body 25. Further, inside the chip body 25, an injectate accommodating portion (injectate accommodating means) 27 for accommodating an injectate is provided. Further, a through hole 28 that communicates with the injectate storage portion 27 is formed in the axial center portion of the male screw portion 26.

The tip 24 has a male screw portion 2
6 is detachably screwed into the screw hole 23a of the rod 23. As described above, the through hole 28 is closed when the tip 24 is screwed to the rod 23.

The tip 24 is made of a shape memory material such as a shape memory alloy or a shape memory resin. Further, a tip valve 29 that opens and closes according to temperature is provided at the tip of the chip body 25. The tip valve 29 has two claws 29a, 29 which are opened in a state of being divided in two directions.
b is provided. When the tip 24 is held at a temperature lower than the body temperature of the human body, as shown in FIGS.
As shown in FIG. 6, the two claws 29a and 29b are held in the closed normal state, and the tip 24 is heated at the temperature (body temperature) of the treatment site H as shown in FIG. The claws 29a, 29b are configured to open in a state of being expanded in two directions.

Next, the operation of the above configuration will be described.
First, the distal tip 24 is removed from the flexible elongated rod 23, and the distal end valve 29 of the distal tip 24 is closed as shown in FIG. Alternatively, the powdered drug p or the drug p solidified with a water-soluble material is inserted into the injectate storage portion 27 of the distal tip 24.

Further, the injectate accommodating portion 27 of the tip 24 is provided.
After filling the inside with the drug p, the tip 24 is screwed and attached to the rod 23. In this state, the endoscope drug delivery tool 21
The insertion portion 22 of is inserted into a channel of an endoscope (not shown). Then, the distal end portion of the insertion portion 22 of the endoscope drug delivery device 21 is guided to the vicinity of the treatment target location through the channel of the endoscope.

Subsequently, the tip 24 is punctured into the treatment site H. At this time, since the distal tip 24 is heated at the temperature of the treatment site H, as shown in FIG.
The tip valve 29 of the tip of the tip body 25 is opened,
The drug p in 7 permeates the treatment site H.

It should be noted that, with the tip 24 being punctured in the treatment site H, the rod 23 is rotated to rotate the tip 24.
May be detached from the rod 23 and placed at the treatment site H.

Therefore, the following effects are obtained with the above-mentioned structure. That is, the injectate is filled only in the injectate storage portion 27 of the distal tip 24 arranged at the distal end of the elongated insertion portion 22 of the endoscope drug delivery tool 21, and the injectant of the distal tip 24 is injected at the time of injecting the injectate. Since only the injectate filled in the container 27 can be released to the outside of the tip chip 24, the volume of the drug p used in one drug injection operation is the injectant container 27 of the tip chip 24. It can be done with the amount stored inside. Therefore, a small amount of drug p
Can be injected into the treatment site H without waste. Furthermore, by adjusting the puncture depth of the distal tip 24, the drug p can be injected with high precision to a desired submucosal depth.

Further, FIGS. 7A and 7B show the fourth embodiment of the present invention.
FIG. FIG. 7 (A) shows a schematic configuration of the distal end portion of the insertion portion 32 of the medical instrument 31 for an endoscope. A flexible elongated rod 33 made of a shape memory alloy is provided in the insertion portion 32 of the endoscope drug implement 31. A sharp conical needle portion (injection needle) 34 is formed at the tip of the rod 33.

On the outer peripheral surface of the needle portion 34, an injectant accommodating recess (injectant accommodating means) 35 for one or a plurality of medicines p or the like is formed.
And an opening / closing valve 36 for opening / closing the opening of the injectate accommodating recess 35 depending on the temperature.

When the needle portion 34 is kept at a temperature lower than the body temperature of the human body, the on-off valve 36 is in the normal state in which the opening of the injectate accommodating recess 35 is closed as shown in FIG. 7 (A). While being held, the needle portion 34 is heated to the temperature (body temperature) of the treatment site H as shown in FIG. 7 (B), so that the opening of the injectate accommodating recess 35 is expanded. It is like this.

Next, the operation of the above configuration will be described.
First, the medicine p is put into the injectate accommodating concave portion 35 of the needle portion 34 of the flexible elongated rod 33, and the open / close valve 36 is set in a closed state.

Further, after the medicine p is filled in the injectate accommodating recess 35 of the needle portion 34, the insertion portion 32 of the endoscope drug implement 31 is inserted.
Is inserted into a channel of an endoscope (not shown). Then, the distal end portion of the insertion portion 32 of the medical instrument 31 for an endoscope is guided through the channel of the endoscope to the vicinity of the treatment target location.

Subsequently, the needle portion 34 is punctured into the treatment site H. At this time, since the needle portion 34 is heated at the temperature of the treatment site H, the opening / closing valve 36 of the needle portion 34 is heated as shown in FIG. 7B.
Is opened, and the medicine p in the injectate accommodating recess 35 of the needle portion 34 is injected into the treatment site H.

Therefore, even in the case of the above construction, the injectate is filled only in the injectate accommodating concave portion 35 of the needle portion 34 arranged at the distal end of the elongated insertion portion 32 of the endoscope drug delivery device 31, At the time of injecting the injectate, the injectate accommodating recess 35 of the needle portion 34
Since only the injectate filled inside can be released to the outside of the needle part 34, the volume of the drug p used in one drug injection operation is the same as that of the third embodiment. The amount stored in the injectate accommodating recess 35 can be sufficient, and a small amount of the drug p can be injected into the treatment site H without waste, and by adjusting the puncture depth of the needle portion 34, the desired submucosa can be obtained. The drug p can be injected into the depth with high precision.

Further, FIGS. 8A and 8B show the fifth embodiment of the present invention.
FIG. FIG. 8A shows a schematic configuration of the distal end portion of the insertion portion 42 of the medical instrument 41 for an endoscope. A flexible elongated rod 43 made of a shape memory alloy is provided in the insertion portion 42 of the endoscope drug implement 41. A sharp cone-shaped needle portion (injection needle) 44 is formed at the tip portion of the rod 43, and a hinge-like portion between the bottom portion 45 of the needle portion 44 and the tip portion of the rod 43 is formed depending on the temperature. An on-off valve 47 that opens and closes via the connecting portion 46 is provided.

Further, an injectate accommodating recess (injectant accommodating means) 48 for the drug p or the like is formed on the joint surface of the tip end portion of the rod 43 with the bottom portion 45 of the needle portion 44. And
The injectate accommodating concave portion 48 is opened / closed in accordance with the opening / closing operation of the needle portion 44 opened / closed via the hinge-like connecting portion 46.

The on-off valve 47 is shown in FIG. 8A when the needle portion 44 is held at a temperature lower than the body temperature of the human body.
As shown in FIG. 8A, the injectate accommodating recess 48 is held in a normal state, and the needle portion 44 is heated at the temperature (body temperature) of the treatment site H as shown in FIG. It is designed so that the opening of the object accommodating recess 48 is opened.

Next, the operation of the above configuration will be described.
First, the medicine p is put into the injectate accommodating recess 48 of the flexible elongated rod 43, and the open / close valve 47 is set in a closed state.
Furthermore, after the medicine p is filled in the injectate accommodating recess 48, the insertion portion 42 of the endoscope drug implement 41 is inserted into a channel of an endoscope (not shown). Then, the distal end portion of the insertion portion 42 of the endoscope medicinal instrument 41 is guided to the vicinity of the treatment target location through the channel of the endoscope.

Subsequently, the needle portion 44 is punctured into the treatment site H. At this time, since the needle portion 44 is heated at the temperature of the treatment site H, the hinge-shaped connecting portion 46 is formed as shown in FIG. 8B.
The needle portion 44 is opened via and the medicine p in the injectate accommodating recess 48 is injected into the treatment site H.

Therefore, even in the case of the above-mentioned structure, the injectate is filled only in the injectate accommodating recess 48 arranged at the tip of the elongated insertion portion 42 of the endoscope drug administration tool 41, and the injectate is injected. Sometimes, only the injectate filled in the injectate accommodating recess 48 can be discharged to the outside of the needle portion 44.
As in the third embodiment, the volume of the drug p used in one drug injection operation can be set to the amount stored in the injectate storage recess 48, and a small amount of the drug p can be efficiently delivered to the treatment site H. The drug p can be injected, and by adjusting the puncture depth of the needle portion 44, the drug p can be injected with high precision to a desired depth under the mucous membrane.

Further, FIGS. 9A and 9B show the sixth embodiment of the present invention.
FIG. FIG. 9 (A) shows a schematic configuration of the medical instrument for endoscope 51. An outer tube 53 and a flexible inner rod 54 that is rotatably inserted into the outer tube 53 are provided in the insertion portion 52 of the endoscope drug implement 51.

Here, a sharp conical needle portion (injection needle) 55 is formed at the tip of the inner rod 54. Further, the needle portion 55 of the inner rod 54 is attached to the tip of the outer tube 53.
A substantially conical needle cover 56 extending along the outer peripheral surface of the
Is provided.

On the outer peripheral surface of the needle portion 55 of the inner rod 54, an injectant accommodating recess (injectant accommodating means) 57 for the medicine p or the like is formed.
Are formed. Further, an opening 58 for releasing the drug is formed on the outer peripheral surface of the needle cover 56 of the outer tube 53.
Then, due to the mutual rotational positions of the outer tube 53 and the inner rod 54, the opening 58 of the outer tube 53 and the injectate accommodating recess 57 of the inner rod 54 overlap as shown in FIG. 9B. An open position where the injectate accommodating recess 57 is opened to the outside,
As shown in FIG. 9 (A), the opening 58 of the outer tube 53 and the injectate accommodating recess 57 of the inner rod 54 are displaced from each other so that the injectant accommodating recess 57 can be switched to a closed position. .

Next, the operation of the above configuration will be described.
First, at the open position where the opening 58 of the outer tube 53 and the injectate accommodating recess 57 of the inner rod 54 are aligned and overlapped, the medicine p is put into the injectate accommodating recess 57 and the injectate accommodating recess 5
After the medicine p is filled into the inside of the inside 7, the injectate accommodating recess 5 of the opening 58 of the outer tube 53 and the inner rod 54 as shown in FIG. 9 (A).
The outer tube 53 and the inner rod 54 are aligned in the rotational position with the closed position in which the injectate accommodating concave portion 57 is closed by shifting the position between the outer tube 53 and the inner rod 54.

In this state, the insertion portion 52 of the endoscope drug implement 51 is inserted into a channel of an endoscope (not shown). Then, the drug delivery device 51 for the endoscope is passed through the channel of the endoscope.
The distal end portion of the insertion portion 52 is guided to the vicinity of the treatment target location.

Subsequently, the needle portion 55 of the drug delivery tool 51 is punctured into the treatment site H. In this state, the inner rod 54 is rotated with respect to the outer pipe 53, and as shown in FIG.
The opening 58 of the inner rod 54 and the injectate accommodation recess 57 of the inner rod 54 are aligned in the rotational position to open the injectate accommodation recess 57 to the outside. At this time, the medicine p is injected from the opened injectate accommodating recess 57 into the treatment site H through the opening 58 of the outer tube 53.

Therefore, even with the above-mentioned structure, the injectate is filled only in the injectate accommodating concave portion 57 arranged at the distal end of the elongated insertion portion 52 of the endoscope drug administration tool 51, and the injectate is injected. Sometimes, the rotational position of the opening 58 of the outer tube 53 and the injectate receiving recess 57 of the inner rod 54 are aligned so that only the injectate filled in the injectate receiving recess 57 can be discharged to the outside of the needle portion 55. Therefore, as in the third embodiment, 1
The volume of the drug p used in the one-time drug injection operation can be set to the amount stored in the injectate storage recess 57, a small amount of the drug p can be injected into the treatment site H without waste, and the needle portion 55 is punctured. By adjusting the depth of the drug, the drug p can be injected with high accuracy to a desired depth under the mucous membrane.

Further, FIG. 10A shows the first embodiment of the sixth embodiment.
It shows a modified example of. In this structure, a concavo-convex portion 61 that engages with each other is provided on the joint surface between the inner peripheral surface of the outer tube 53 and the outer peripheral surface of the inner rod 54. In this case, the concavo-convex portion 61 between the inner peripheral surface of the outer tube 53 and the outer peripheral surface of the inner rod 54 facilitates adjustment of the mutual rotational positions of the inner rod 54 and the outer tube 53.

Further, FIG. 10B shows the second embodiment of the sixth embodiment.
It shows a modified example of. This is provided with a plurality of openings 58 of the needle cover 56 of the outer tube 53 and a plurality of injectate accommodating recesses 57 of the inner rod 54. In this case, there is an effect that the injection amount of the medicine can be changed by changing the number of the injectate accommodating concave portions 57 for containing the medicine.

The present invention is not limited to the above embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention. Next, other characteristic technical matters of the present application will be additionally described as follows.

(Supplementary Note 1) In a treatment instrument for injecting a drug or the like for injecting an injectate such as a drug endoscopically into a tissue in a body cavity, the treatment device is provided with a needle at the tip. A treatment instrument for injecting a drug or the like, which has a means for accommodating the drug or the like only near the needle portion.

(Additional Item 2) The means for accommodating the additional item 1 is a membrane which is provided on the hand side of the needle portion, through which a gas can pass but a liquid cannot pass. (Additional Item 3) The film of Additional Item 2 is made of a porous fluorine-based resin. (Additional Item 4) The means for accommodating the additional item 1 is a removable needle portion.

[0059]

According to the present invention, since the injectate accommodating means for accommodating the injectate is provided only in the vicinity of the needle portion of the injecting needle, a small amount of injectate such as a drug as compared with the prior art does not require a wasteful capacity. In addition, it can be reliably injected into the tissue to be treated in the patient's body.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a drug injection treatment tool according to a first embodiment of the present invention.

FIG. 2 is a vertical sectional view showing an injectate container.

FIG. 3 is a vertical cross-sectional view of a main part showing a second embodiment of the present invention.

FIG. 4 is a vertical cross-sectional view showing the main configuration of a medical instrument for endoscope according to a third embodiment of the present invention.

FIG. 5 is a perspective view of a tip.

FIG. 6 is a vertical cross-sectional view of the main parts of the endoscope drug delivery device for explaining the drug injection operation.

FIG. 7 shows a fourth embodiment of the present invention (A)
Is a vertical cross-sectional view of a main part of the drug delivery device for endoscope, and (B) is a vertical cross-sectional view of a main part of the drug delivery device for endoscope for explaining a drug injection operation.

FIG. 8 shows a fifth embodiment of the present invention (A)
Is a vertical cross-sectional view of a main part of the drug delivery device for endoscope, and (B) is a vertical cross-sectional view of a main part of the drug delivery device for endoscope for explaining a drug injection operation.

FIG. 9 shows a sixth embodiment of the present invention, in which (A)
Is a vertical cross-sectional view of a main part of the drug delivery device for endoscope, and (B) is a vertical cross-sectional view of a main part of the drug delivery device for endoscope for explaining a drug injection operation.

FIG. 10A is a cross-sectional view showing a first modification of the sixth embodiment, and FIG. 10B is a perspective view of essential parts showing a second modification of the sixth embodiment.

[Explanation of symbols]

2, 22, 32, 42, 52 ... Insertion part, 9 ... Injection needle, 1
1, 14 ... Injectate accommodating portion (injectant accommodating means), p ... Drug (injectant), 24 ... Tip (injection needle), 27 ... Injectant accommodating portion (injectant accommodating means), 34, 44, 55 ... Needle portion (injection needle), 35, 48, 57 ... Injectate accommodating recess (injectate accommodating means).

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Koichi Kawashima 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Co., Ltd. (72) Yutaka Yanuma 2-43-2 Hatagaya, Shibuya-ku, Tokyo No. Olympus Optical Co., Ltd. (72) Inventor Yasuhiro Ueda 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Co., Ltd.

Claims (1)

[Claims] 1. An injectable material for injecting an injectable material such as a drug at a tip portion of an insertion portion to be inserted into a body cavity, and an injectable material for injecting the injectable material into a tissue in a body through the injecting needle. A treatment tool for injecting an injectate, comprising an injectate accommodating means for accommodating the injectate only in the vicinity of the needle portion of the injection needle.