Dilatation Catheter
A technology for dilating catheters and catheter shafts, applied in catheters, balloon catheters, etc., can solve the problem of difficult extraction of balloon catheters, and achieve the effects of preventing breakage, reducing deflection, and preventing falling off
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[0061] (First embodiment)
[0062] Hereinafter, a first embodiment embodying the present invention will be described based on the drawings. figure 1 It is a brief overall side view of the balloon catheter 10.
[0063] Such as figure 1 As shown, the balloon catheter 10 has: a catheter tube (catheter shaft) 11, a sleeve 12 attached to the proximal end (base end) of the catheter tube 11, and the distal end of the catheter tube 11 (Front end) of the balloon 13.
[0064] The catheter tube 11 is composed of a plurality of tubes (tubular shafts), and has an inner-outer multi-tube structure (inner-outer double-tube structure) at least from a midway position in the longitudinal direction (axial direction) to the position of the balloon 13. Specifically, the catheter tube 11 has an outer tube (outer tube) 15 and an inner tube (inner tube) 16 having a smaller inner diameter and outer diameter than the outer tube 15, and the inner tube 16 is inserted into the outer tube 15 to form the above Mu...
Example
[0098] (Second embodiment)
[0099] Figure 7 It is a cross-sectional view showing the balloon catheter 10a of the second embodiment. The balloon catheter 10a is different from the first embodiment in that it is equipped with an urging spring 79 between the stopper 81 and the movable mounting member 71. The urging spring 79 can absorb the remaining length of the linear member 31 by the urging force when the balloon 13 is contracted, so that the deflection of the linear member 31 can be further reduced.
[0100] The force spring 79 can not only be Figure 7 The illustrated metal coil spring may be, for example, a resin member having a spring function formed by using an elastic polyamide-based elastomer as a base material. It should be noted that the urging spring 79 is also called a urging member.
[0101] For example, when the bending rigidity of the linear member 31 is small and it is difficult to expect a restoring force, or when the balloon 13 is set to be long to cope with a lo...
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