Pressure sensor and electrophysiological catheter

Abstract

The invention provides a pressure sensor and an electrophysiological catheter. An elastic pipe body is limited in a certain deformation range, so that the elastic pipe body can be prevented from fracturing, and the service life of a strain gauge can be prolonged. The pressure sensor includes the elastic pipe body and the strain gauge; the strain gauge is arranged on the elastic pipe body; the elastic pipe body is provided with hollow horizontal grooves; at least one set of first limit structures is arranged between the two opposite ends of the horizontal grooves; at least one set of first limit structures includes first limit parts and second limit parts; the first limit parts are connected to the first groove walls of the horizontal grooves; the second limit parts are connected to the second groove walls of the horizontal grooves; and when the axial deformation of the horizontal grooves occurs, the first and second limit parts can synchronously do relative motion with the horizontal grooves until being in mutual fastening. The electrophysiological catheter includes a catheter far end, and the catheter far end is provided with the pressure sensor.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a pressure sensor and an electrophysiological catheter. Background technique [0002] In recent years, the catheter system can be used for interventional therapy such as arrhythmia and refractory hypertension. For example, in the treatment of atrial fibrillation in arrhythmia, the ablation or mapping catheter enters the heart through the vein or artery, and the heart is mapped to find abnormal electrical signal positions or pathways, and then energy is applied for ablation to terminate or Change useless electrical signals to achieve therapeutic effects. Another example is renal artery ablation for the treatment of refractory hypertension. The ablation catheter enters the connecting artery between the abdominal aorta and the kidney from the artery, ablation blocks the parasympathetic nerve pathway, and plays a role in lowering blood pressure. [0003] In ablation therapy...

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Problems solved by technology

[0010] However, if Figure 3a and Figure 3b As shown, when the elastic tube body 1 is stretched under force, the transverse groove 11 will synchronously produce axial deformation. It can be seen that during the stretching process, the opposite sides of the transverse groove 11 are out of the way indicated by the dotted line. The initial position produces a certain amount of deformation, and the problem of "stress concentration" will appear at the opposite ends of the transverse groove 11, especially when the deformation of the transverse groove 11 exceeds a certain degree, the opposite ends of the transverse groove 11 Stress cracking or even fracture will occur at both ends. At this time, the strain gauge will also permanently fail due to the strain exceeding a certain range.

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