CN-122006067-A - Tension-resistant traction suction catheter of pulse negative pressure source and driving equipment

CN122006067ACN 122006067 ACN122006067 ACN 122006067ACN-122006067-A

Abstract

The invention belongs to the technical field of medical appliances, in particular to a tension-resistant traction suction catheter of a pulse negative pressure source and driving equipment, which solve the problems that the traditional suction catheter is insufficient in performance, the negative pressure source is difficult to form effective pulse negative pressure and lacks negative pressure peak control, the device is used for improving the flexibility and tensile strength of the catheter, a pulse mechanism consisting of a sealing disc and a linkage mechanism is arranged in the driving equipment, a connecting pipeline is automatically opened when negative pressure reaches a peak value, intermittent pulse negative pressure output is formed, a protection mechanism is further arranged, the pressure is automatically reduced when the negative pressure exceeds a set threshold value, the catheter is matched with the driving equipment, pulse negative pressure can be formed in the suction process, thrombus loosening is promoted, and meanwhile, the catheter structure can adapt to vascular bending and collapse is avoided.

Inventors

CHENG LING
WANG DUANCHENG
WEI WENTAO
CHEN LONG
LI SIPING
TIAN ZIYUAN

Assignees

湖南瑞康通科技发展有限公司

Dates

Publication Date: 20260512
Application Date: 20260413

Claims (10)

1. The tension-resistant traction suction catheter of the pulse negative pressure source is characterized by comprising a catheter (1), wherein an opening at one end of the catheter (1) is in a horn shape and is used for sucking thrombus into the catheter (1) through the horn opening, the catheter (1) comprises an inner liner tube layer (2), a reinforced tube layer (3), a support tube layer (4) and an outer tube (5), and the inner liner tube layer (2), the reinforced tube layer (3), the support tube layer (4) and the outer tube (5) are sequentially arranged from inside to outside; the reinforced pipe layer (3) consists of a spiral metal net (6), and the spiral metal net (6) is wound on the outer wall of the inner liner pipe layer (2) in a double-spiral reverse winding mode by a plurality of metal wires, so as to improve the flexibility, the folding resistance and the fatigue resistance of the catheter (1); The supporting tube layer (4) is composed of a plurality of metal rings (7) and transverse metal wires (8), a plurality of metal rings (7) are sleeved on the outer wall of the spiral metal net (6), two adjacent metal rings (7) are fixedly connected through the plurality of transverse metal wires (8), and the supporting tube layer is used for improving the tensile strength of the catheter (1) and preventing the inner cavity of the catheter (1) from collapsing.
2. A pulsed negative pressure source tension-resistant traction aspiration catheter according to claim 1, wherein the inner tube layer (2) is made of polytetrafluoroethylene, the outer tube (5) is made of polyurethane, and the spiral wire mesh (6), the metal rings (7) and the transverse wires (8) are made of wires with superelastic and shape memory properties, such as nitinol wires.
3. A pulsed negative pressure source driving device for providing a negative pressure source for a tension-resistant traction suction catheter of a pulsed negative pressure source according to claim 1, characterized by comprising a housing (9), wherein a negative pressure tank (10) is mounted on the bottom inner wall of the housing (9), and a piston plate I (11) is connected in a sealing sliding manner in the negative pressure tank (10); The negative pressure driving mechanism is arranged in the shell (9) and connected with the piston plate I (11) and is used for driving the piston plate I (11) to reciprocate so as to generate negative pressure in the negative pressure box (10); A connecting pipe I (33) one end of which is communicated with one side of the negative pressure box (10) away from the piston plate I (11), and the other end of which extends to one side of the housing (9); The device also comprises a pulse mechanism, wherein the pulse mechanism is arranged in the negative pressure box (10) and corresponds to the port of the connecting pipe I (33), the pulse mechanism comprises a rotating shaft (27) and a sealing disc (29) arranged on the outer wall of the rotating shaft (27), and the sealing disc (29) is used for sealing the port of the connecting pipe I (33).
4. A pulsed negative pressure source driving apparatus according to claim 3, further comprising a collecting box (35) provided at one side of the housing (9), wherein one end of the connecting pipe I (33) away from the housing (9) extends into the collecting box (35), a connecting pipe II (38) for connecting the conduit is communicated with the top of the collecting box (35), a filter screen (36) is installed in the collecting box (35), and a blood return pipe (37) is communicated with the bottom of the collecting box (35).
5. The pulse negative pressure source driving device according to claim 4, wherein the negative pressure driving mechanism comprises a permanent magnet synchronous motor (16), a rotating disc (17), a pin shaft (18), a movable frame (14) and a pull rod (13), the permanent magnet synchronous motor (16) is mounted on the inner bottom wall of the shell (9), the rotating disc (17) is rotationally connected in the shell (9) and is connected with an output shaft of the permanent magnet synchronous motor (16), the pin shaft (18) is fixed at an eccentric position of the rotating disc (17), the movable frame (14) is fixedly connected with one end of the pull rod (13), the other end of the pull rod (13) is fixedly connected with the piston plate I (11), a strip-shaped groove (15) is formed in the movable frame (14), and the pin shaft (18) stretches into the strip-shaped groove (15) and is in sliding hinged fit with the strip-shaped groove (15).
6. The pulsed negative pressure source drive apparatus of claim 5, characterized in that the pulsing mechanism further comprises a rotating arm (28), a spur gear (31), a lifting plate (22), a spring (23), a sliding rod (25), a rack (26), a trapezoidal block I (19) and a trapezoidal block II (24); The rotating arm (28) is fixedly sleeved on the outer wall of the rotating shaft (27) and fixedly connected with the sealing disc (29), the spur gear (31) is fixed at the end part of the rotating shaft (27), the lifting plate (22) is slidably arranged above the negative pressure box (10) through a plurality of vertical rods (21), a plurality of springs (23) are connected between the top of the lifting plate (22) and the inner wall of the top of the protective box I (20), the sliding rod (25) is fixed at the bottom of the lifting plate (22) and hermetically slides into the negative pressure box (10), the rack (26) is fixed at one side of the sliding rod (25) and is meshed with the spur gear (31), the trapezoid block I (19) is fixed at one side of the piston plate I (11) close to the pull rod (13), and the trapezoid block II (24) is fixed at the bottom of the lifting plate (22) and hermetically slides into the negative pressure box (10) and is matched with the trapezoid block I (19); The pulse mechanism further comprises a limiting plate (30) fixed on the inner wall of the negative pressure box (10), and the limiting plate (30) is used for stopping when the spring (23) drives the closing disc (29) to reset.
7. The pulsed negative pressure source driving apparatus according to claim 6, further comprising a protection mechanism including a buffer tube (39) fixedly connected to the connection tube I (33), a piston plate II (40) sealingly slidably connected in the buffer tube (39), a magnet block (41) fixed to an inner wall of a top portion of the buffer tube (39), an electromagnet (42) fixed to a top portion of the piston plate II (40), and a tension spring (43) connected between the top portion of the piston plate II (40) and the inner wall of the top portion of the buffer tube (39).
8. The pulsed negative pressure source driving apparatus according to claim 7, further comprising a pneumatic sensor (34), wherein the pneumatic sensor (34) is disposed on an outer wall of the connecting pipe I (33) for detecting a negative pressure peak in the connecting pipe I (33) and controlling on-off of the electromagnet (42).
9. The pulsed negative pressure source driving apparatus according to claim 8, further comprising a protective case II (32) fixed to an inner wall of the negative pressure tank (10), wherein an end of the rotating shaft (27) and a bottom end of the slide rod (25) are sealed to extend into the protective case II (32), and the spur gear (31) and the rack (26) are positioned in the protective case II (32).
10. The pulsed negative pressure source driving device according to claim 9, further comprising a capacity expansion box (44) fixed in the outer shell (9), wherein the bottom of the capacity expansion box (44) is communicated with the top of the negative pressure box (10) through a plurality of second communicating pipes (45), a piston plate III (46) is connected in the capacity expansion box (44) in a sealing sliding manner, a threaded rod (47) is connected to the top of the piston plate III (46) in a rotating manner, and the top end of the threaded rod (47) is connected to the top of the capacity expansion box (44) in a threaded manner.

Description

Tension-resistant traction suction catheter of pulse negative pressure source and driving equipment Technical Field The invention relates to the technical field of medical equipment, in particular to a tension-resistant traction suction catheter of a pulse negative pressure source and driving equipment. Background In the field of vascular interventional therapy, thrombotic aspiration is a key technical means for treating thromboembolic diseases such as acute ischemic cerebral apoplexy, acute myocardial infarction and the like. The technique extracts thrombus from the blood vessel through the catheter, restores the vascular patency and avoids tissue ischemia necrosis caused by thrombus blockage. In clinical application, the existing thrombus aspiration catheter often faces a plurality of technical bottlenecks: 1. in addition, when the thrombus is pulled and removed by strong force, the traditional large-caliber catheter is easy to axially stretch and deform (stretch), so that the diameter of the catheter is collapsed, the negative pressure transmission efficiency is reduced, and even the effective grabbing force on the thrombus is lost in the retracting process; 2. the existing negative pressure driving equipment mostly adopts a continuous negative pressure output mode, thrombus is easily and tightly attached to the wall of a blood vessel under the action of continuous negative pressure, loosening and detachment are difficult, so that the suction success rate is reduced, although some equipment tries to realize pulse negative pressure output, the problem that the pulse frequency is not accurately regulated, the negative pressure peak value is difficult to control exists, when the negative pressure peak value is too high, excessive traction can be caused on the wall of the blood vessel to cause vascular injury, and when the negative pressure peak value is too low, enough suction force cannot be generated, and thrombus cannot be effectively removed. Disclosure of Invention The invention aims to solve the defects that the traditional suction catheter is insufficient in performance, an effective pulse negative pressure is difficult to form by a negative pressure source and negative pressure peak control is lacked, and provides a tension-resistant traction suction catheter of the pulse negative pressure source and driving equipment. In order to achieve the above purpose, the present invention adopts the following technical scheme: The tension-resistant traction suction catheter of the pulse negative pressure source comprises a catheter, wherein an opening at one end of the catheter is in a horn shape and is used for sucking thrombus into the catheter through the horn opening, the catheter comprises a lining pipe layer, a reinforcing pipe layer, a supporting pipe layer and an outer pipe, and the lining pipe layer, the reinforcing pipe layer, the supporting pipe layer and the outer pipe are sequentially arranged from inside to outside; the reinforced pipe layer consists of a spiral metal net, and the spiral metal net is formed by winding a plurality of metal wires on the outer wall of the lining pipe layer in a double-spiral reverse winding mode, so as to improve the flexibility, the folding resistance and the fatigue resistance of the catheter; The supporting tube layer is composed of a plurality of metal rings and transverse metal wires, a plurality of metal rings are sleeved on the outer wall of the spiral metal net, and two adjacent metal rings are fixedly connected through the plurality of transverse metal wires, so that the tensile strength of the catheter is improved, and the collapse of the inner cavity of the catheter can be prevented. In one possible design, the material of the inner liner layer is polytetrafluoroethylene, the material of the outer layer is polyurethane, and the spiral wire mesh, the wire loops and the transverse wires are made of wires having superelastic and shape memory properties, such as nitinol wires. The pulse negative pressure source driving device is used for providing a negative pressure source for the tension-resistant traction suction catheter of the pulse negative pressure source and comprises a shell, wherein a negative pressure box is arranged on the inner wall of the bottom of the shell, and a piston plate I is hermetically and slidingly connected in the negative pressure box; the negative pressure driving mechanism is arranged in the shell and connected with the piston plate I and used for driving the piston plate I to reciprocate so as to generate negative pressure in the negative pressure box; One end of the connecting pipe I is communicated with one side of the negative pressure box, which is far away from the piston plate I, and the other end of the connecting pipe I extends to one side of the shell; The device also comprises a pulse mechanism which is arranged in the negative pressure box and corresponds to the port of the connecting pipe I, wherein the pulse mechani