Medical implement

Abstract

The invention is aimed to provide a medical implement capable of variably keeping a certain length in a puncturing needle to be projected, and securely projecting the puncturing needle from the top of even a curved catheter. This medical implement comprises an inner tube catheter 11 with the puncturing needle 1 attached to the top, an outer tube catheter 12 which houses at least a part of the inner tube catheter 11, allowing it to move back and forth therein, a cylindrical body 2 fixed on the rear end of the inner tube catheter 11, an enclosure 5 which houses the cylindrical body 2, allowing it to move back and forth therein, and an adjustment mechanism 9 which variably adjusts the stroke length of the cylindrical body 2. When the cylindrical body 2 is moved backward, the puncturing needle 1 is housed in the outer tube catheter 12. When the cylindrical body 2 is moved forward, the puncturing needle 1 is projected from the outer tube catheter 12. The projection length of the puncturing needle 1 can be variably adjusted by the adjustment mechanism 9.

Description

technical field [0001] The invention relates to a medical appliance. Background technique [0002] In order to inject a drug solution or the like into an affected part in a body cavity, it is known that an injection needle is inserted through the jaws of an endoscope to puncture the affected part to inject the drug (for example, Patent Document 1). The structure of such an injection needle is as follows. (a) an inner tube probe with a puncture needle installed at the front end, a cavity for liquid medicine flow in the inner tube probe, and an internal handle installed at the rear end, (b) an outer tube probe with the inner tube probe The needle is housed in the lumen by an outer grip accommodating an inner barrel grip that causes the inner barrel probe to protrude from the front end of the outer barrel probe, and a pin positioned at the front end of the outer barrel probe for determining the position of the needle that slides back and forth. The contact positioning surface...

AI Technical Summary

Problems solved by technology

[0004] However, since the length of the protruding puncture needle is constant in this type of medical instrument, there is a problem that when changing the position to be used or directly changing the protruding length of the puncture needle according to the patient's condition Under this condition, additional protruding length medical devices must be prepared

[0007] As a common problem of these medical instruments, there is the following problem: whether the puncture needle is in the state of being accommodated in the inner cavity of the outer tube probe or protruding, it is difficult to judge at once, and the inner handle and the outer handle are the same color In the case of

There is a possibility that the puncture needle may be pulled out from the jaw of the endoscope while protruding from the outer tube probe by mistake, or, when inserted, the inner cavity of the jaw of the endoscope may be damaged

In addition, when the puncture needle is pulled out from the jaws in a protruding state, there is a possibility that the liquid medicine may splash from the tip of the puncture needle.

[0008] In addition, in the type of adjusting the protruding length, it has been known empirically that due to the difference in the degree of bending and the number of bending parts of the probe, the phenomenon to be avoided in the structure as follows occurs, that is, due to the double-folding of the probe. structure, therefore, according to the accumulation of tiny bends of the inner cylinder probe in the outer cylinder probe caused by the gap between the outer cylinder probe and the inner cylinder probe, and the frictional resistance between the outer cylinder probe and the inner cylinder probe, in The protruding length of the puncture needle confirmed before the endoscope is inserted is different from the actual protruding length during puncture. Especially when the tip of the endoscope is greatly bent, a discrepancy between the outer tube probe and the inner tube probe may occur. The frictional resistance of the needle is extremely large and the puncture needle does not protrude.

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