JP5319043B2 - Endoscopic puncture needle and endoscope apparatus - Google Patents

Description

  The present invention relates to an endoscope puncture needle and an endoscope apparatus that are used by being introduced into a body cavity through a channel of the endoscope.

Conventionally, a technique for introducing a treatment tool into a body cavity and performing a necessary treatment is known. As a treatment tool used for this type of treatment, a biopsy specimen collecting device has been proposed that includes a stopper protection member that serves both as a protection for a needle tip sharp portion and a needle protrusion stopper at the tube sheath tip (for example, (See Patent Document 1). Since the stopper protection member used in the biopsy specimen collection device described in Patent Document 1 is a hard member, the needle is prevented from breaking through the sheath.
In addition, a catheter including a connector having a sheath and an end that can protrude from the sheath tip has been proposed (see, for example, Patent Document 2). The catheter described in Patent Document 2 is provided with means for controlling the retracted position of the end portion of the sheath. Further, a hard protective member is disposed on the inner surface of the distal end portion of the catheter to prevent the needle from breaking through the sheath.
US Pat. No. 4,791,937 US Pat. No. 5,785,689

  In the devices described in Patent Document 1 and Patent Document 2, when the needle member is in the retracted position, the tip of the needle member is positioned on the protective member. The length of the protection member is added to the length of the needle member, and the length of the hard tip portion is relatively long. Thereby, there exists a possibility that the penetration property to an endoscope channel may worsen. Furthermore, in order to always ensure the retracting position of the needle member in the protection member, as pointed out in Patent Document 2, it is necessary to make the protection member a certain length.

  Further, in the apparatus described in Patent Document 2, a means for controlling the retracting position of the needle member is provided, and the retracting position of the needle member can be accurately controlled. In the rolled-up state, the needle pull-in position moves forward from the clearance between the inner space of the sheath and the outer periphery of the needle moving means. Therefore, the needle pull-in control for controlling the pull-in amount of the needle member in consideration of the movement amount Even if the means is provided, it is necessary to set the protective member long.

  The present invention has been made in order to solve the above-described problems, and the maximum rigid portion length does not exceed the length of the needle member, so that the insertion property to the endoscope channel is improved and the distal end of the needle member is provided. An object of the present invention is to provide an endoscopic puncture needle that reliably protects the lens.

In order to achieve the above object, the present invention provides the following means.
One aspect of the present invention is a needle member disposed in a flexible sheath so as to be able to advance and retract, needle moving means for moving the needle member back and forth, and a protruding amount of the needle member disposed at the distal end of the sheath. A protrusion amount restricting means that is provided on the inner periphery of the sheath, and a tip end is fitted to the protrusion amount restricting means, and a protecting means that protects the tip end of the needle member, and the needle provided on the needle member when member protrudes from the sheath tip, the protruding amount restricting means engaging with a projection amount control means for controlling the projection amount from the sheath distal end of said needle member, said needle member to said protective means a movable back and forth against consists flexible portion having at least a portion flexible length of said protection means, said needle member in a state retracted within the sheath, the flexible portion is the projecting amount regulating means And the tip of the needle member A endoscopic puncture needle, characterized in that disposed on at least a portion between.

  In this invention, first, an endoscope puncture needle is inserted into an endoscope, and a sheath is projected from the distal end portion of the endoscope. Thereafter, the needle member is protruded from the sheath tip by the needle moving means. At this time, the protrusion amount regulating means and the protrusion amount control means are engaged, and the protrusion amount of the needle member from the distal end portion of the sheath is controlled. Moreover, since a part of the protection means is made of a flexible portion having flexibility, when the sheath is inserted into the endoscope, damage to the inner surface of the sheath due to the needle member can be prevented. Furthermore, in the past, the length of the hard tip portion of the puncture needle for an endoscope was long. However, in the present invention, the flexible portion is disposed between the protruding amount regulating means and the tip of the needle member, so that the hard tip portion protrudes. Only the amount regulating means can be used, and the distal end hard portion length can be shortened. Accordingly, it is possible to improve the insertion property of the puncture needle for endoscope into the endoscope.

The endoscope puncture needle according to the above aspect includes one or more openings provided on the distal end side and the proximal end side of the needle member, the protrusion amount regulating means, and the protrusion amount control means. when case, a seal member for communicating the interior space of the inner space and the needle member of the sheath, further wherein the protective means comprises a coil member, wire diameter to at least a portion of the coil member While having a larger pitch, the tip may be connected by fitting with a helical male thread provided on the base end side of the protruding amount regulating means .

  In the present invention, the seal member can ensure communication between the internal space of the sheath and the internal space of the needle member. Furthermore, since a part of the coil member has a pitch larger than the strand diameter, the degree of freedom of bending of the sheath in which the coil member is accommodated is increased, and the tip of the coil member and the protrusion amount regulating means are fitted. Therefore, the tip of the needle member can be reliably protected within the sheath.

In endoscopic puncture needle of the above embodiment, the protection means, the entire region of the outer periphery to the inner peripheral surface of the sheath may be formed into a coil shape in contact.
Another aspect of the present invention is an endoscope apparatus including any of the above-described endoscope puncture needles .
With the endoscope apparatus of the above aspect, it is possible to treat a lesion site or the like with an endoscope puncture needle while observing the inside of a body cavity.

The present invention has the following effects.
According to the endoscope puncture needle according to the present invention, since a part of the protection means is formed of a flexible part, the hard end of the endoscope puncture needle is divided into two via the flexible part. It becomes possible to improve the insertion property to the inside. In addition, since the tip of the needle member is reliably protected within the sheath, it is possible to prevent the needle member from breaking through the sheath.

Next, a first embodiment of the present invention will be described with reference to FIGS.
As shown in FIGS. 1 and 2, the puncture needle 10 for an endoscope according to the present embodiment is used by being inserted into a forceps channel 2 of an endoscope 1 provided with an operation unit 5. After inserting the insertion portion 3 of the mirror 1 into the body cavity, the insertion portion 3 is inserted into the forceps channel 2 from the forceps port 4 of the endoscope 1 and used.
The puncture needle 10 for endoscope includes a flexible insertion portion 20 that is inserted into the forceps channel 2 and a hand operation portion 30 that controls a protruding amount of the tubular needle member 22 and the like.

  The insertion portion 20 includes a flexible elongated sheath 21, a stopper (protrusion amount regulating means) 23 that is disposed at the distal end of the sheath 21 and has an internal space through which the needle member 22 can be inserted, and the distal end of the needle member 22. A protection member (protection means) 24 for protecting the portion 22a, a cylindrical locking member (projection amount control means) 25 inscribed in the outer peripheral surface of the needle member 22, and a cylindrical shape, and the inner peripheral surface is A seal member 26 that is in contact with the outer peripheral surface of the needle member 22 and the outer peripheral surface is in contact with the protective member 24, and a fluid communication opening 27 provided on the proximal end 22 b side of the needle member 22. I have. The locking member 25 and the seal member 26 are disposed on the proximal end 22 b side of the needle member 22 and are disposed on the distal end portion 22 a side of the needle member 22 with respect to the opening portion 27.

  A tip opening 22 c is provided at the tip of the needle member 22 and communicates with the opening 27. Thereby, using a syringe (not shown), cells or the like sucked from the tip opening 22c enter the needle member 22. Further, the needle member 22 has a sharp tip formed by inclining the distal end portion 22a at an acute angle, thereby facilitating the penetration into the living tissue.

  As shown in FIG. 3, a protrusion 23 a for connecting and fixing the sheath 21 is provided on the distal end side of the stopper 23, and an external thread portion 23 b for fitting with the protective member 24 is provided on the outer peripheral surface on the proximal end side. Is provided. Furthermore, the stopper 23 has a regulating portion 23c that is inclined from the center of the insertion portion 20 toward the hand operating portion 30 on the inner peripheral surface on the proximal end side (see FIG. 2).

  The protection member 24 is made of a coil member and is provided in contact with the inner peripheral surface of the sheath 21. On the stopper 23 side of the protective member 24, as shown in FIG. 3, there is provided a fitting portion 24a that can be fitted to the male screw portion 23b of the stopper 23, for example, in a tightly wound shape. In addition, the hand operating part 30 side of the fitting part 24a has flexibility that is disposed between the stopper 23 and the distal end part 22a of the needle member 22 in a state where the needle member 22 is pulled into the sheath 21. It has a flexible main body (flexible part) 24b. The flexible main body 24b is formed, for example, in a loosely wound shape, and has a pitch b larger than the strand diameter a. Further, the protection member (protection means) 24 has a longer overall length than the needle member 22.

Further, when the needle member 22 protrudes from the distal end portion of the sheath 21 through the seal member 26, the locking member 25 engages with the stopper 23 and regulates the length of protrusion of the needle member 22. It is supposed to be.
The seal member 26 is connected to the distal end side of the sheath 21 of the locking member 25. Thereby, in the state which the needle member 22 protruded from the front-end | tip part of the sheath 21, the internal space of the needle member 22 and the internal space of the sheath 21 can be fluid-committed, and those airtightness are hold | maintained.
Further, the seal member 26 is made of an elastic member, and is elastically deformed by being sandwiched between the stopper 23 and the locking member 25 so that the airtight state between the inner space of the sheath 21 and the inner space of the needle member 22 is kept good. It has become.

As shown in FIGS. 2 and 4, the hand operating unit 30 is connected to the proximal end 22 b side of the needle member 22 and allows the needle member 22 to advance and retreat in the axial direction of the insertion unit 20, and this operation wire. A knob (needle moving means) 32 connected to 31, a base 33 connected to the sheath 21, and a fixed base 34 provided on the base 33 to fix the knob 32 freely.
The base 33 includes a port 35 to which a syringe (not shown) is connected, and has an internal space 36 into which the operation wire 31 can be inserted. Further, the operation wire 31 is provided with a restricting member 37 having an outer diameter larger than that of the operation wire 31 so as to control the retracted position of the needle member 22 on the proximal end 22b side.

Next, a method of using the endoscope puncture needle 10 of the present embodiment having the above configuration will be described below.
First, the endoscope insertion part 13 is inserted into the body cavity, and the operation part 5 is operated to guide it near the treatment site. Then, the sheath 21 of the endoscope puncture needle 10 is inserted into the forceps channel 2 of the endoscope 1 while the needle member 22 is drawn into the sheath 21. At this time, since the knob 32 of the hand operating unit 30 is pulled out from the base 33 by a predetermined amount, the needle member 22 is accommodated in the sheath 21.

From this state, the puncture needle 10 for endoscope is protruded from the distal end portion of the endoscope 1 to the treatment site. Thereafter, the knob 32 is pushed toward the base 33. At this time, as shown in FIG. 2, the internal state of the sheath 21 includes the hard portion 40 of the stopper 23, the flexible portion 41 of the protection member 24, and the hard portion of the needle member 22. 42 is formed. Further, when the knob 32 is directed toward the base 33 and pushed until the seal member 26 abuts against the restricting portion 23c, the needle member 22 is exposed from the distal end portion of the sheath 21, as shown in FIG.
The needle member 22 is punctured into the treatment site. As described above, in a state where the needle member 22 protrudes from the sheath 21, the locking member 25 engages with the restriction portion 23 c via the seal member 26, and the amount of protrusion of the needle member 22 from the distal end of the sheath 21 is controlled. Yes. After the puncture, a syringe (not shown) is connected to the port 35, and an aspiration biopsy is performed to collect tissue, cells, body fluid, and the like.

  According to the puncture needle 10 for an endoscope according to the present embodiment, the flexibility of the protective member 24 between the stopper 23 and the distal end portion 22a of the needle member 22 in a state where the needle member 22 is pulled into the sheath 21. Since the main body portion 24 b is arranged, the distal end portion 22 a of the needle member 22 is reliably protected in the sheath 21 without breaking through the sheath 21. Further, it is divided into a hard part 40, a flexible part 41, and a hard part 42. That is, since the hard portions 40 and 42 are divided into two via the flexible portion 41, the flexibility is improved and the insertion property into the forceps channel 2 can be improved. Further, when the sheath 21 is pulled by pulling the endoscope puncture needle 10 from the forceps channel 2 of the endoscope 1, the needle member 22 is reliably disposed in the protective member 24 even when the sheath 21 is extended. I can leave it to you.

Next, a reference example according to the present invention will be described with reference to FIGS. Note that, in the reference examples described below, the same reference numerals are given to the portions having the same configuration as the endoscope puncture needle 10 according to the first embodiment described above, and the description will be omitted.
In the puncture needle 50 for an endoscope according to the present reference example , the shape of the stopper 51, that the locking member 52 is provided instead of the locking member 25 and the seal member 26, and the shape of the protective member 53 This is different from the first embodiment.

The stopper 51 has a cylindrical shape, and has a locking portion 51a having a thickness on the holding member 53 side that is equal to the wire diameter. Thereby, the front end 53 a side of the protection member 53 can abut against the engaging portion 51 a of the stopper 51.
The protective member 53 is made of a coil member, and is disposed in the sheath 21 so as to be stretchable. Further, the base end 53 b side of the protection member 53 is connected to the locking member 52, and is fixed to the needle member 22 via the locking member 52. Thereby, along with the movement of the needle member 22 that is in contact with the locking member 52, the protection member 53 is also movable while expanding and contracting along the axial direction of the sheath 21.

Next, a method of using the endoscope puncture needle 50 of the present reference example configured as described above will be described below.
First, in the same manner as in the first embodiment, the endoscope puncture needle 50 is projected from the distal end portion of the endoscope 1 to the treatment site, and the knob 32 is pushed toward the base 33. At this time, as shown in FIG. 6, the internal state of the sheath 21 includes the endoscope puncture needle 50, the hard portion 60 of the stopper 51, the flexible portion 61 of the protection member 53, and the hard portion 62 of the needle member 22. And will be formed. Further, when the knob 32 is directed toward the base 33 and pushed in until the one end 53a of the protective member 53 hits the locking portion 51a, the strands of the protective member 53 are brought into close contact with each other as shown in FIG. The needle member 22 is exposed from the distal end portion of the needle 21, and the needle member 22 is punctured into the treatment site. Thus, in the state which protruded the needle member 22 from the sheath 21, the holding member 53 engages with the latching | locking part 51a, and the protrusion amount of the needle member 22 is controlled. At this time, the holding member 53 expands and contracts, and the entire length of the holding member 53 is shortened. Then, after puncturing, a syringe (not shown) is connected to the port 35, and an aspiration biopsy is performed to collect tissues, cells, body fluids, and the like.

According to the puncture needle 50 for an endoscope according to the present reference example , the holding member 53 is engaged with the locking portion 51a and the protruding amount of the needle member 22 is controlled, so that the number of components can be reduced. And cost reduction can be achieved.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, although the protection members 24 and 53 are coil members, any member having flexibility may be used. For example, the protection members 24 and 53 may be made of an elastic member such as rubber. Further, in the first embodiment, the seal member 26 may not be provided. In this configuration, the locking member 25 and the restricting portion 23c of the stopper 23 are engaged, and the needle member 22 from the distal end portion of the sheath 21 is engaged. You may control the protrusion amount of. Furthermore, the flexible main body 24b is preferably formed in a coil shape from a wire having an element wire diameter of 0.1 mm to φ0.3 mm. The pitch b is preferably 0.1 mm to 0.5 mm. Further, although the needle member 22 having the tip opening 22c and the opening 27 is used, a needle in which these are not formed may be used.

  (Additional Item 1) A needle member disposed in a flexible sheath so as to freely advance and retreat, a needle moving means for moving the needle member forward and backward, and a protrusion that is disposed at the distal end of the sheath and restricts the protrusion amount of the needle member. An amount restricting means; a protecting means provided on the inner peripheral surface of the sheath for protecting a sharp portion at the tip of the needle member; and a protrusion amount restriction when the needle member provided on the needle member protrudes from the sheath tip. And a protrusion amount control means for controlling the protrusion amount of the needle member from the sheath tip by engaging with the means, wherein at least a part of the entire length of the protection means is a flexible portion, and the needle A puncture needle for an endoscope, wherein the flexible portion is disposed between the protrusion amount regulating means and the tip of the needle member in a state where the member is pulled into the sheath.

(Additional Item 2) A tubular needle member disposed in a flexible sheath so as to freely advance and retract, a needle moving means for moving the needle member forward and backward, and a protruding amount of the needle member disposed at the distal end of the sheath A protruding amount regulating means, a protecting means for protecting a sharp portion of the distal end of the needle member provided on the inner peripheral surface of the sheath, and one or more openings each provided on the distal end side and the proximal end side of the needle member And a protrusion amount control means for controlling the protrusion amount of the needle member from the sheath tip by engaging with the protrusion amount restricting means when the needle member protrudes from the sheath tip. A seal member that communicates the internal space of the sheath and the internal space of the needle member when the protrusion amount restricting means and the protrusion amount control means are engaged,
The protection means comprises a coil member, and at least a part of the coil member has a pitch larger than the wire diameter, and the distal end is fitted with a helical male screw portion provided on the proximal end side of the protrusion amount regulating means. An endoscope puncture needle characterized by being connected together.

  (Additional Item 3) A needle member disposed in a flexible sheath so as to be able to advance and retreat, a needle moving means for moving the needle member forward and backward, and a protrusion that is disposed at the distal end of the sheath and restricts the protrusion amount of the needle member. A volume regulating means, a protection means for protecting a sharp portion at the distal end of the needle member provided on the inner peripheral surface of the sheath, and one or more openings each provided on the distal end side and the proximal end side of the needle member; The protection means comprises a coil member, the proximal end side of the coil member being fixed to the needle member, at least part of which has a pitch larger than the wire diameter, and provided on the needle member. When the needle protrudes from the sheath distal end, it is engaged with the protrusion amount restricting means to control the protrusion amount of the needle member from the sheath distal end.

(Additional Item 4) The total length of the flexible portion is longer than the total length of the needle member, is formed in a coil shape from a wire having a strand diameter of φ0.1 mm to φ0.3 mm, the tip side has a tightly wound portion, and tightly wound The puncture needle for an endoscope according to Additional Item 2, wherein the portion is fitted to the thread portion of the protrusion amount regulating means.
According to this configuration, by setting the wire diameter of the flexible portion to be φ0.1 mm to φ0.3 mm, the distal end of the flexible portion and the male screw portion are securely fitted, and the sheath has a desired refraction. It becomes possible to do.

(Additional Item 5) The puncture needle for an endoscope according to Additional Item 4, wherein the flexible portion has at least a loosely wound portion and has a pitch of 0.1 mm to 0.5 mm.
According to this configuration, by setting the pitch of the sparsely wound portion of the flexible portion to 0.1 mm to 0.5 mm, the sparsely wound portion has sufficient flexibility, and the insertion property into the endoscope is improved. It becomes possible to make it good.

(Additional Item 6) The protective member is a coil formed of a wire having a strand diameter of φ0.1 mm, the pitch of the coil is 0.1 mm to 0.5 mm, and the number of turns is 26 or more. A puncture needle for an endoscope according to 1.
According to this configuration, the amount of protrusion of the needle member from the sheath tip can be set to the optimum amount of protrusion desired.

It is a top view which shows the state inserted in the endoscope which shows the puncture needle for endoscopes which concerns on 1st Embodiment of this invention. It is principal part sectional drawing which shows the whole puncture needle for endoscopes of FIG. It is a top view which shows the stopper and protection member which are used for the puncture needle for endoscopes of FIG. FIG. 2 is a cross-sectional view of a main part showing a hand operation part of the puncture needle for endoscope of FIG. 1. FIG. 2 is a cross-sectional view of a main part showing a state in which a needle member of the puncture needle for endoscope of FIG. 1 is protruded from a distal end portion of a sheath. It is sectional drawing which shows the insertion part of the puncture needle for endoscopes which concerns on 2nd Embodiment of this invention. FIG. 7 is a cross-sectional view of an essential part showing a state in which a needle member of the puncture needle for endoscope of FIG. 6 is protruded from a distal end portion of a sheath.

Explanation of symbols

10, 50 Endoscopic puncture needle 21 Sheath 22 Needle member 23, 51 Stopper (projection amount regulating means)
23b Male thread part 24, 53 Protection member (protection means)
24b Flexible body part (flexible part)
25 Locking member (projection amount control means)
26 Seal member 27 Opening 32 Knob (needle moving means)

Claims (4)

A needle member disposed in a sheath having flexibility so as to advance and retract;
Needle moving means for advancing and retracting the needle member;
A protrusion amount restricting means for restricting the protrusion amount of the needle member disposed at the sheath tip;
Protecting means that is provided on the inner periphery of the sheath, and whose tip is fitted to the protrusion amount regulating means, and protects the tip of the needle member;
A protrusion amount control means for controlling the protrusion amount of the needle member from the sheath tip by engaging with the protrusion amount restricting means when the needle member protrudes from the sheath tip, provided on the needle member;
The needle member is movable forward and backward with respect to the protection means,
At least a part of the entire length of the protection means is composed of a flexible portion having flexibility,
Endoscopic puncture, wherein the flexible portion is disposed at least at a part between the protrusion amount regulating means and the tip of the needle member in a state where the needle member is pulled into the sheath. needle. The puncture needle for an endoscope according to claim 1,
One or more openings each provided on the distal end side and the proximal end side of the needle member;
A seal member that communicates the internal space of the sheath and the internal space of the needle member when the protrusion amount restricting means and the protrusion amount control means are engaged ;
Further comprising
The protection means comprises a coil member, and at least a part of the coil member has a pitch larger than the wire diameter, and the distal end is fitted with a helical male screw portion provided on the proximal end side of the protrusion amount regulating means. An endoscope puncture needle characterized by being connected together. The puncture needle for an endoscope according to claim 1 or 2 , wherein the protection means is formed in a coil shape in which the entire outer periphery contacts the inner peripheral surface of the sheath. An endoscope apparatus comprising the endoscope puncture needle according to any one of claims 1 to 3 .

Images