Bending-controllable micro catheter

Abstract

The utility model discloses a bending-controllable micro catheter, and relates to the technical field of interventional catheters, the bending-controllable micro catheter comprises a catheter body and a base, the catheter body comprises an inner tube and an outer tube, the inner tube and the outer tube are fixed at the far end, and the inner tube and the outer tube can axially and relatively move to bend the far section. At least one of the inner tube and the outer tube forms a transverse groove, and the groove cutting modes of the near section and the far section of the inner tube and the outer tube are different. The interval width of the far-section cutting grooves is fixed, and the interval width of the near-section cutting grooves is gradually increased and moves relative to the circumferential direction. The sensor is arranged at the far end of the catheter body, the environment condition of the catheter cavity can be effectively detected, treatment precision is improved, and equipment loss and operation risks are reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of interventional catheter, in particular to a controllable bending microcatheter. BACKGROUND

[0002] Interventional catheter is an indispensable auxiliary tool in human body septum puncture, cardiovascular intervention, peripheral vascular intervention, heart atrial septostomy, renal artery ablation, heart valve repair, tumor interventional embolization and other human body lumen intervention surgeries with bifurcated blood vessels and requiring precise positioning. Usually, a pre-plasticity catheter is used to pre-establish a channel from the body to the target position, providing a channel for subsequent guide wire or other instruments to enter for diagnosis and treatment. However, due to the individual differences in human body structure, the pre-plasticity catheter cannot completely meet all clinical needs. Once the inserted catheter does not meet the physiological structure of the patient, it needs to be withdrawn and a new catheter is inserted, which will increase the operation time and may cause harm to the patient.

[0003] In order to adapt to the individual differences of human body anatomy, controllable bending microcatheter emerges as the times require and is widely used. The controllable bending microcatheter is that under the premise of fixing the distal ends of the inner tube and the outer tube, the inner tube and the outer tube are axially displaced, so that the distal end of the catheter is bent at different angles. When the bending angle of the catheter meets the specific physiological structure characteristics of the human body lumen, the base is stopped. At this time, the distal end of the catheter is aligned with the target lumen inlet, and then the diagnostic and / or therapeutic instruments / mediums are delivered to the target lumen through the catheter. SUMMARY

[0004] The purpose of the present application is to overcome the shortcomings of the prior art and provide a controllable bending microcatheter. The controllable bending microcatheter comprises a catheter body and a base. The catheter body comprises an inner tube and an outer tube. The inner tube and the outer tube are fixed at the distal ends and arranged to be axially displaced. The inner tube and the outer tube form a transverse slot. The proximal segment and the distal segment of the inner tube and the outer tube have different slot modes. Through the innovation of the slot mode, the overall mechanical performance of the catheter is improved. The distal end of the catheter body is provided with a sensor. The sensor is connected with the base through a wire arranged in an intermediate lumen between the inner tube and the outer tube. The human body cavity environment can be effectively monitored, the treatment accuracy is improved, the equipment loss and the operation risk are reduced.

[0005] To achieve the above purpose, the present application provides a controllable bending microcatheter, which comprises a catheter body and a base. The catheter body comprises an inner tube and an outer tube. The outer tube is sleeved outside the inner tube. The inner tube and the outer tube are fixedly connected at the distal ends. The inner tube and the outer tube can axially move relative to each other. The axial movement causes the distal end of the catheter body to bend.

[0006] The inner tube and the outer tube form transverse cut slots, the proximal section and the distal section of the inner tube and the outer tube have different transverse cut slot modes; the distal section of the inner tube and the outer tube has the same transverse cut slot shape and the same opening direction, the interval width of the transverse cut slot is fixed; the proximal section of the inner tube and the outer tube has the same transverse cut slot shape and is circumferentially displaced from each other, the circumferential displacement angle of two adjacent transverse cut slots is equal, and the interval width between the transverse cut slots gradually increases from the distal end to the proximal end.

[0007] The interval width of the transverse cut slot of the distal section of the outer tube and the inner tube is smaller than the interval width between the two most distal cut slots of the proximal section transverse cut slot.

[0008] In some embodiments, the inner side of the inner tube and the outer layer of the outer tube are both provided with a high polymer layer.

[0009] In some embodiments, the distal end of the outer tube and the distal end of the inner tube are fixedly connected by means of metal glue or stuffing.

[0010] In some embodiments, the distal end of the outer tube and the distal end of the inner tube are fixedly connected by means of single-point or multi-point welding, the plurality of welding points are circumferentially symmetrically distributed in the intermediate lumen formed between the inner tube and the outer tube, and there is a gap between the welding points.

[0011] In some embodiments, the distal end of the catheter body is provided with a sensor, the sensor can be arranged in a reserved cut slot or an intermediate lumen, a lead wire of the sensor is arranged in an intermediate lumen between the inner tube and the outer tube, and the lead wire is connected with the sensor and a base.

[0012] In some embodiments, the sensor can be a pressure sensor or an ultrasonic sensor, and the sensor includes a receiver and a transmitter.

[0013] In some embodiments, the outer side of the lead wire arranged in the intermediate lumen formed between the inner tube and the outer tube is provided with a sleeve, and the sleeve is made of soft high polymer material.

[0014] By using the above technical solutions, the present application has the following beneficial effects compared with the prior art. On the one hand, the controllable bending microcatheter adopts the structure of inner and outer double tube end fixed and axial movement, and is assisted by the transverse cut slot structure with different arrangement and distribution forms, so that the flexibility of the distal section and the proximal section of the inner tube and the outer tube is different, the stability of the inner and outer double tube is maintained, and the controllability of the bending of the distal section of the catheter is effectively improved, avoiding the complicated process of the traditional controllable bending catheter. On the other hand, the controllable bending microcatheter is provided with an ultrasonic sensor or a pressure sensor at the distal end of the catheter body, and the lead wire is protected by high polymer material, which expands the functionality and safety of the catheter, and can effectively monitor the environment of the body lumen, thereby improving the treatment accuracy, reducing the instrument loss and the risk of operation. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1Fig. 1 is a schematic diagram of an embodiment of the controllable bending microcatheter proposed by the present application;

[0016] Figure 2 Fig. 2 is a schematic diagram of the controllable bending microcatheter proposed by the present application causing the catheter to bend after the inner and outer tubes are axially moved;

[0017] Figure 3 Fig. 3 is a schematic diagram of the slits of an embodiment of the controllable bending microcatheter proposed by the present application;

[0018] Figure 4 Fig. 4 is a structural cross-sectional view of the catheter body of an embodiment of the controllable bending microcatheter proposed by the present application.

[0019] Fig. 5 is a list of feature names corresponding to the reference numerals in the drawings.

[0020] 1, base; 2, catheter body; 21, inner tube; 22, intermediate lumen; 23, outer tube; 24, sensor; 241, wire; 25, infusion lumen; 26, slit; 27, proximal segment transverse slit; 28, distal segment transverse slit. DETAILED DESCRIPTION

[0021] The present application will be further described in detail below with specific embodiments in conjunction with the drawings. In the field of medical devices, the proximal end refers to the end of the medical device that is controlled by the doctor or outside the human body, and the distal end refers to the other end of the medical device that plays a diagnostic / therapeutic role or is in the human body, thereby defining the proximal and distal directions, and accordingly naming the distal and proximal ends of the overall structure or individual parts for ease of detailed description.

[0022] The controllable bending microcatheter proposed by the present application is mainly used for interventional surgery. Through sensor monitoring, infusion of medium and / or liquid and / or delivery of embolic material and / or appropriate instruments, the monitoring of blood flow links and blood pressure conditions is achieved, and the precision of interventional surgery is improved, and the instrument loss and surgical risk are reduced.

[0023] Embodiments of the controllable bending microcatheter in the present application:

[0024] A controllable bending microcatheter includes a base 1 and a catheter body 2, and the distal end of the base 1 is connected to the proximal end of the catheter body 2. The catheter body includes an inner tube 21 and an outer tube 23, and an intermediate lumen 22 is formed between the inner tube 21 and the outer tube 23, and an infusion lumen 25 is formed inside the tube 21. The inner tube 21 and the outer tube 23 are fixedly connected at the distal end, and the inner tube 21 and the outer tube 23 are arranged to be axially relatively displaceable to cause the distal end of the catheter body 2 to bend.

[0025] The inner tube 21 and the outer tube 23 are provided with transverse cut slots, and the inner tube 21 and the outer tube 23 can be divided into distal transverse cut slots 28 and proximal transverse cut slots 27, and the distal transverse cut slots 28 and the proximal transverse cut slots 27 are different in cut slot mode. The distal transverse cut slots 28 are the same in cut slot shape, the cut slots are open in the same direction, and the cut slots are equal in interval distance; the proximal transverse cut slots 27 are the same in cut slot shape, the cut slots are displaced from each other in the circumferential direction, and the cut slots are gradually increased in interval width from the distal end to the proximal end.

[0026] In a specific embodiment, a cut slot 26 is provided at the distal end of the catheter body 2, and the sensor 24 is arranged in the cut slot 26. The sensor 24 can be an ultrasonic sensor or a pressure sensor, and the sensor 24 is connected to the base 1 through a lead wire 241 arranged in the intermediate lumen 22.

[0027] In a specific embodiment, the lead wire 241 is fixedly arranged in the intermediate lumen 22, and a sleeve made of a soft high polymer material is arranged outside the lead wire.

[0028] In a specific embodiment, a high polymer layer is arranged outside the outer tube 23 and inside the inner tube 21, and the intermediate lumen 22 is sealed and isolated from the external environment of the outer tube 23 and the internal infusion lumen 25 of the inner tube 21, so as to avoid the interference of the sensor 24 and the lead wire 241 by the internal and external liquids or instrument environments, so as to avoid the influence of the safety and stability.

[0029] In the embodiment of the present application, the terms related to the directions and position relationships such as "inner", "outer" and the like are only for the convenience of describing the present application, and cannot be understood as the limitation of the present application.

[0030] In the related description of the present application, unless otherwise explicitly stated, the terms such as "connection", "connection" should be understood in a broad sense, including but not limited to fixed connection, detachable connection, integral connection, indirect connection through medium, or mechanical connection, electrical connection, conductive component communication.

[0031] The embodiment of the present application is only for the purpose of describing the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and to implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application should be covered within the protection scope of the present application.

Claims

1. A steerable microcatheter, comprising: The catheter body comprises an inner tube and an outer tube, the outer tube and the inner tube each comprise a proximal section and a distal section, at least one tube of the outer tube and the inner tube forms a transverse slot, the proximal section and the distal section are different in slotting mode; The outer tube is sleeved outside the inner tube, the outer tube and the inner tube are fixedly connected at the distal end, the outer tube and the inner tube can move axially relative to each other, the axial movement of the outer tube and the inner tube causes the distal end of the catheter body to bend. The distal section transverse slots of the outer tube and the inner tube are the same in shape and open in the same direction, the interval width of the distal section transverse slots is fixed; the proximal section transverse slots of the outer tube and the inner tube are the same in shape and circumferentially displaced relative to each other, the interval width of the proximal section transverse slots gradually increases from the distal end to the proximal end.

2. The steerable microcatheter of claim 1, wherein, The circumferential displacement angles of two adjacent proximal section transverse slots are equal.

3. The steerable microcatheter of claim 2, wherein, The interval width of the distal section transverse slots of the outer tube and the inner tube is smaller than the width between the two distal-most proximal section transverse slots.

4. The steerable microcatheter of claim 3, wherein, The outer tube is provided with a high polymer layer, and the inner tube is provided with a high polymer layer on the inner side.

5. The steerable microcatheter of claim 4, wherein, The fixed connection mode of the outer tube and the inner tube at the distal end includes single-point welding, metal glue or filling connection.

6. The steerable microcatheter of claim 5, wherein, The outer tube and the inner tube are fixedly connected at the distal end by multi-point welding, a plurality of welding points are circumferentially symmetrically distributed, and gaps exist between the welding points.

7. The steerable microcatheter of claim 5, wherein, An intermediate lumen is formed between the inner tube and the outer tube, a sensor is arranged at the distal end of the catheter body, and a wire connecting the sensor and the base is arranged in the intermediate lumen.

8. The steerable microcatheter of claim 6 or 7, wherein, The sensor comprises a receiver and a transmitter, and the sensor is an ultrasonic sensor or a pressure sensor.

9. The steerable microcatheter of claim 8, wherein, A sleeve is arranged outside the wire, and the sleeve is made of soft high polymer material.

10. The steerable microcatheter of claim 9, wherein, ​

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