JPS6325782B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a body cavity foreign body recovery device for extracting foreign bodies such as gallstones in a body cavity using a foreign body grasping basket made of a plurality of elastic wires.

Endoscopically remove foreign bodies in body cavities, such as gallstones,
The procedure for removing the gallstones from the body cavity generally involves removing the gallstones from the gallbladder using the bile duct, and transporting the gallstones through the papilla into the duodenum. In addition, when the gallstone is larger than the narrowed part of the papilla and difficult to remove, a procedure is adopted in which the gallstone is temporarily placed in the narrowed part and removed out of the body cavity using a separate extraction means.

The retrieval tool used to remove troublesome foreign bodies such as gallstones has a basket made of multiple elastic wires at the tip of a flexible tube that can be inserted into the endoscope channel. Those equipped with the ability to be submerged freely will be adopted. As this type of retrieval tool, baskets made of elastic wires of various stiffnesses have been used since the functionality of the basket is important.

However, with a basket made of hard elastic wire, it is easy to open the basket reliably in the bile duct and capture and grasp gallstones into the basket due to its strong elasticity. It is extremely difficult to remove gallstones if they are left in the stenotic area as described above.

In addition, baskets made of soft elastic wire have weak elasticity, so in order to remove gallstones from inside the basket, it is necessary to press the basket against the bile duct wall, which deforms the basket and allows the gallstones to be easily removed. However, on the other hand, it is difficult to remove gallstones from the affected area.

For this reason, the collection tools used to remove foreign bodies such as gallstones, which need to be taken in and removed from time to time, are
Its operability was poor.

Therefore, recently, a retrieval tool has been developed in which a part of the elastic wire that makes up the basket for grasping foreign objects is made independent and can be moved forward and backward separately from the hand side, but since a separate operation system is added, However, the operation was troublesome and had no effect on improving operability.

The present invention has been made in view of the above-mentioned circumstances, and its object is to configure a part of the plurality of elastic wires constituting the basket for grasping a foreign object with elastic wires having weak elastic force, It is an object of the present invention to provide a device for collecting foreign matter in a body cavity, which is made of an elastic wire having strong elasticity, and is capable of easily taking in and taking out foreign matter.

The present invention will be explained below based on a first embodiment shown in the drawings. Reference numeral 1 in FIG. 1 is a flexible tube of a recovery tool 2, and a base 3 is attached to the proximal end of this flexible tube 1. The flexible tube 1 has an outer diameter that allows it to be inserted into a channel of an endoscope (not shown), so that its distal end can be guided into the body cavity through the endoscope. An operating wire 4 is inserted into the flexible tube 1 so as to extend toward the proximal side. Further, a basket 6 for grasping foreign matter is provided at the distal end portion 5 of the flexible tube 1 so as to be freely protrusive and retractable.

Moreover, the structure of this basket 6 is centered around a plurality of elastic wires 7, for example, four elastic wires 7 whose central portions are elastically displaced outward, and the tips of these elastic wires 7 are fixed with a tip 8. Similarly, the rear ends of the elastic wires 7 are fastened together with the tip of the operating wire 4 by the rear end tip 9, and a flexible wire is provided in the space surrounded by each of the elastic wires 7. It constitutes a foreign matter storage section 10.

The present invention is applied to this basket 6. That is, one of the elastic wires 7 constituting the basket 6 is composed of a so-called soft elastic wire 7a with a weak elastic force, and the other elastic wires 7 are composed of a so-called hard elastic wire 7a with a strong elastic force. The basket 6 is composed of two types of elastic wires 7b, each having a different elastic force.

Note that 11 connects the proximal side of the operating wire 4 to the operating tube 1.
2, and the operating tube 12 thereof protrudes from the proximal end of the flexible tube 1.

When removing a foreign object from a body cavity, such as a gallstone in a bile duct, using the recovery tool 2 configured as described above, first pull the basket advancement/retraction operation section 11 to remove each elastic wire 7a of the basket 6. , 7b... into the tip 5 of the flexible tube 1. In this state, for example, the flexible tube 1 is inserted into the channel of the endoscope that has been inserted into the body cavity in advance.
Insert. Later, a foreign body was discovered in the bile duct,
When catching the foreign object, the basket advance/retreat operation section 11 is pressed and the elastic wires 7a, 7b, . This causes the bile ducts to expand and bulge, allowing them to take in foreign objects. However,
Foreign matter is taken into the basket 6 through the gaps between the elastic wires 7b. After the foreign matter has been taken in, the elastic wires 7a, 7b, . When the endoscope is removed, it is removed from the duodenum through the papilla and out of the body cavity.

In addition, when retaining a foreign object, if a large foreign object is retained in a narrowed area such as a papilla and is difficult to remove, it is recommended to place the foreign object near the narrowed area where it can be easily removed using a separate extraction means. However, in this case, by pressing the soft elastic wire 7a on the distal end 5 side against the inner wall of the bile duct by various operations (angle operation, etc.) of the endoscope, the soft elastic wire 7a may become a foreign object due to its weak elasticity. The elastic wire 7b easily slips from inside the basket 6...
The foreign matter will be ejected due to its strong elasticity.

Therefore, the basket 6 is constructed using a combination of the elastic wire 7a with weak elasticity and the elastic wire 7b with strong elasticity.
By configuring this, it is possible to easily take in and take out foreign objects, and it is possible to improve the operability of the recovery tool 2.

It should be noted that the present invention is not limited to the embodiment described above, and may be implemented, for example, as in the second embodiment shown in FIG.

That is, in the second embodiment, among the elastic wires 7 constituting the basket 6, for example, two elastic wires 7, 7 existing at point-symmetrical positions are replaced with so-called soft elastic wires 7a, 7a having weak elastic force. The other parts are made of so-called hard elastic wires 7b, 7b having strong elastic force. Even in this case, the same effects as in the first embodiment described above can be achieved.

In FIG. 2, the same components as those in the first embodiment are given the same numbers and their explanations are omitted.

Further, in each of the above-described embodiments, the present invention is applied to a basket made of four elastic wires, but it goes without saying that it can also be applied to a basket made of a plurality of other elastic wires.

As explained above, according to the present invention, some of the plurality of elastic wires constituting the basket for grasping a foreign object are made of elastic wires with weak elastic force, and the others are made of elastic wires with strong elastic force. Because it is made of wire, when grasping a foreign object, the elastic wire with strong elasticity can sufficiently expand the basket located in the lumen of the affected area to easily catch the foreign object. The foreign object can be easily removed by shifting the weak elastic wire.

Therefore, it is possible to provide a collection tool that can easily both take in and take out foreign objects and has excellent operability.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a retrieval tool according to a first embodiment of the present invention, and FIG. 2 is a sectional view showing a retrieval tool according to a second embodiment. 1... Flexible tube, 6... Basket, 7a... Elastic wire with weak elastic force, 7b... Elastic wire with strong elastic force.

Claims (1)

[Claims] 1. In a body cavity foreign body recovery tool comprising a foreign body grasping basket made of a plurality of elastic wires, which is retractably provided at the distal end of a flexible tube, the plurality of foreign body grasping baskets are A collection device for a foreign body in a body cavity, characterized in that some of the elastic wires are made of elastic wires with weak elastic force, and the others are made of elastic wires with strong elastic force.