CN107397575B

CN107397575B - Sheath tube for thrombus disruption system

Info

Publication number: CN107397575B
Application number: CN201710741615.3A
Authority: CN
Inventors: 蔡改贫; 宋乐明; 程铁栋
Original assignee: Jiangxi University of Science and Technology
Current assignee: Jiangxi University of Science and Technology
Priority date: 2017-08-25
Filing date: 2017-08-25
Publication date: 2021-04-09
Anticipated expiration: 2037-08-25
Also published as: CN107397575A

Abstract

The invention relates to a sheath tube for a thrombus disruption system. A sheath tube for a thrombus crushing system comprises a front sheath tube and a rear sheath tube which are placed in a blood vessel and are relatively independent, wherein the outer parts of the rear end of the front sheath tube and the front end of the rear sheath tube are respectively sleeved with a front plugging balloon and a rear plugging balloon, the front plugging balloon and the rear plugging balloon are respectively positioned at two sides of thrombus in the blood vessel, and a crushing cavity is formed between the front plugging balloon and the rear plugging balloon; the front plugging saccule and the rear plugging saccule are squeezed or loosened in a blood vessel by external force to expand or contract so as to plug or open the thrombus, a core pipe which coaxially penetrates through the rear sheathing pipe is arranged in the rear sheathing pipe, and the front end of the core pipe is a breaker for breaking the thrombus. According to the invention, the structures of the front sheath tube, the rear sheath tube and the two plugging balloons are adopted to plug two ends of thrombus, then the thrombus is crushed by the crusher, and the crushed thrombus is discharged from the excretion tube, so that the structure is novel, and the thrombus removal effect is good.

Description

Sheath tube for thrombus disruption system

Technical Field

The invention belongs to a medical instrument used in an interventional operation method, and relates to an instrument for crushing, extracting and discharging sediments in a blood vessel, in particular to a sheath tube for a thrombus crushing system.

Background

The cerebral artery and vein of human body often have thrombus formation, and the current thrombus pathological changes mainly include drug-induced thrombolysis, surgical thrombus extraction and mechanical thrombus extraction treatment methods.

The thrombolytic drug can directly or indirectly dissolve thrombus through intravenous injection, thereby dredging blocked blood vessels; another thrombolytic method is to introduce the lytic drug directly into the site of the thrombus via a catheter. This thrombolytic method is prone to bleeding side effects, especially in patients at risk of visceral or cerebral hemorrhage, and should be contraindicated for thrombolytic therapy.

The surgical treatment is to open an incision at a site where a thrombus is present and remove the thrombus from the incision. However, surgery is difficult to remove from the vein and residual thrombotic debris generated during the procedure can enter the lungs and cause an embolism in the lungs.

The mechanical intervention type thrombus extraction method is characterized in that a thrombus extraction instrument is introduced into a vein through a minimally invasive surgery, a thrombus extraction device is contacted with thrombus by utilizing radiography and X-ray fluoroscopy, and the thrombus is directly crushed and removed or passes through the thrombus to be extracted. Compared with thrombolysis and surgical thrombus removal, the method has small wound area and small influence on veins at thrombus deposition positions.

The patents related to the technology (mechanical crushing and removing the suppository) mainly include: a thrombus breaking thrombus taking device (ZL201110098919.5) discloses a thrombus taking device which can enter a blood vessel of a human body, break thrombus and effectively take out the thrombus. The patent solves the problem that the tiny guide wire is easy to bend when passing through the thrombus, is difficult to aim at the central position of the thrombus to pass through, and is easy to damage the blood vessel, and improves the safety of thrombus extraction. But the thrombus fragments are difficult to be completely captured and discharged out of the body during the process that the guide wire passes through the thrombus and the metal mesh breaks the thrombus.

The thrombus breaking device (ZL 200420049312.3) discloses a medical equipment range which converts sound energy into mechanical energy to break thrombus in a vibration mode so as to achieve the purpose of assisting thrombus removal. However, this patent only provides an extracorporeal adjuvant treatment during the removal of emboli. In the process of thrombus removal or fragmentation, thrombus is easy to generate tiny fragments which are difficult to capture, and the tiny fragments are remained in venous blood and enter a venous vein, artery and organs, so that other veins and organs are subjected to embolism or function failure.

Thrombectomy and its preparation method and application method (201010262495.7) disclose a thrombectomy device, which comprises a delivery catheter, a guide wire rod, a guide wire head, a far end/near end basket, etc. When in use, the resectoscope and the basket are placed into a blood vessel by means of X-ray, the basket is released and opened after the thrombus is penetrated, and the thrombus is cut off and loosened and then is flushed into the basket by blood flow to be collected. Because the exciser and the net basket can cause the thrombus to break when passing through the thrombus, thrombus fragments can flow through the net basket to enter the rear end of the blood vessel, and secondary embolism at the far end of the blood vessel is easily caused; in addition, the basket is prone to damage the intima of the vessel when collecting thrombi.

A partial occlusion type thrombectomy scraper (201010238525.0) discloses a device for occluding, fragmenting and scraping thrombi. When the thrombus is removed, the two blocking balloons are opened after penetrating the thrombus, and the thrombus between the balloons is discharged from the blood vessel after being rotated, crushed and scraped by the thrombus scraping wire ball. When the saccule needs to pass through thrombus, thrombus fragments which can cause secondary embolism at the far end of the blood vessel are also generated; in addition, scraping the thrombus silk ball will cause direct damage to the vascular intima.

A thrombectomy system (201510108393.2) discloses a mechanical thrombectomy device consisting of a thrombectomy device, a balloon guide catheter and a delivery catheter. When the thrombus is removed, the saccule is firstly expanded to implement proximal protection, and then the exciser in the contraction state is expanded after passing through the thrombus; the thrombus is detached from the blood vessel by pulling the excision and collected and discharged outside the body. When the exciser needs to pass through thrombus, thrombus fragments which can cause secondary embolism at the far end of the blood vessel are generated; in addition, movement of the resector may also cause direct damage to the intima of the vessel.

Disclosure of Invention

The sheath tube for the thrombus crushing system is designed to overcome the defects of the prior art and adapt to practical requirements, so that thrombus is effectively crushed, thrombus fragments can be completely discharged, and the high efficiency and safety of thrombus removal are realized.

In order to realize the purpose of the invention, the following technical scheme is adopted:

a sheath tube for a thrombus crushing system comprises a front sheath tube and a rear sheath tube which are placed in a blood vessel and are relatively independent, wherein the outer parts of the rear end of the front sheath tube and the front end of the rear sheath tube are respectively sleeved with a front plugging balloon and a rear plugging balloon, the front plugging balloon and the rear plugging balloon are respectively positioned at two sides of thrombus in the blood vessel, and a crushing cavity is formed between the front plugging balloon and the rear plugging balloon; the front plugging saccule and the rear plugging saccule are squeezed or loosened in a blood vessel by external force to expand or contract so as to plug or open the thrombus, a core pipe which coaxially penetrates through the rear sheathing pipe is arranged in the rear sheathing pipe, and the front end of the core pipe is a breaker for breaking the thrombus.

The knappers are jet holes distributed on the wall surface of the front end of the core pipe, the tail end of the core pipe is communicated with a conveying pipeline of a broken medium, and the broken medium is sprayed out by the knappers to break thrombus.

The jet holes are arranged on the wall surface of the core pipe layer by layer at intervals in sequence according to the arrangement rule of the straight holes and the inclined holes, the axes of the straight holes are perpendicular to the wall surface of the core pipe, the included angle a between the axis of the inclined holes and the axis direction of the core pipe is 0-90 degrees, the jet holes are distributed on the wall surface 1-20 mm away from the front end of the core pipe, and 8-20 layers are arranged.

The front sheath tube and the rear sheath tube respectively comprise hollow inner tubes with two closed ends, the front plugging saccule and the rear plugging saccule are respectively sleeved outside the inner tubes, the inner tubes of the front sheath tube and the rear sheath tube are sleeved with outer tubes, the outer tubes are divided into a thrombus far-end outer tube and a thrombus near-end outer tube, and the front plugging saccule and the rear plugging saccule are both sleeved outside the inner tube between the two sections of outer tubes; the outer tube at the far end of the thrombus is sleeved with a balloon expansion nut, the outer end of the balloon expansion nut is statically connected with the inner tube, and the inner end of the balloon expansion nut is matched and sleeved with the outer tube at the far end of the thrombus through threads; the front plugging saccule realizes expansion and contraction by axially extruding or releasing the thrombus far-end outer tube.

The lower end of the inner tube of the rear sheath tube is provided with a connecting port connected with the drainage tube.

The two ends of the front plugging saccule are respectively and fixedly connected with the thrombus far-end outer tube and the thrombus near-end outer tube of the front sheath tube, and the two ends of the rear plugging saccule are respectively and fixedly connected with the thrombus far-end outer tube and the thrombus near-end outer tube of the rear sheath tube.

The framework of the front plugging saccule and the framework of the rear plugging saccule are both grid-shaped frameworks woven by elastic metal wires, and the outside of the framework is coated with a closed elastic film.

A radial gap is formed between the core tube and the inner tube wall of the rear sheath tube, a plurality of groups of convex ribs are distributed in the inner tube of the rear sheath tube, and each group of convex ribs is more than three, is uniformly distributed on the inner cylindrical surface of the inner tube and is parallel to the axis of the inner tube; the flow area formed by the convex ribs, the outer cylindrical surface of the core tube and the inner cylindrical surface of the inner tube is not less than the flow area of the core tube.

The invention has the beneficial effects that:

the two ends of the thrombus are blocked by adopting the structures of the front sheath tube, the rear sheath tube and the two blocking balloons, then the thrombus is crushed by the crusher, and the crushed thrombus is discharged from the excretion tube, so that the structure is novel, and the thrombus removing effect is good;

the designed rear sheath tube has a multilayer nested structure, and is used for a channel for conveying a high-pressure pulse liquid medium to a crushing area and a channel for sucking and discharging the crushed thrombus out of the body;

the metal wire mesh and the elastic film are effectively compounded, then the balloon with an ellipsoidal structure capable of expanding and contracting is designed, and the balloon is fixedly connected with the front sheath tube and the rear sheath tube respectively, so that the balloon is mainly used for constructing a closed crushing area of the broken bolt and realizing near-end and far-end protection;

4. the sheath pipe of present case, can be nimble with the broken system combination of current thrombus, replace original structure, realize the thrombus breakage.

Drawings

FIG. 1 is a schematic view of a use configuration applied to one of the thrombus breaking devices;

FIG. 2 is an enlarged view of the sheath;

FIG. 3 is an enlarged view of the rear sheath;

FIG. 4 is an enlarged partial schematic view of the fragmenter;

fig. 5 is an enlarged partial sectional view showing the radial positions of the core tube and the inner tube in the front sheath tube.

The meaning of the respective reference numerals in the figures:

1 is an anterior sheath tube, 101 is an inner tube of the anterior sheath tube, 102 is a ring, 103 is a balloon expansion nut, 104 is a thrombus distal end outer tube of the anterior sheath tube 1, 105 is a anterior occlusion balloon, 106 is a thrombus proximal end outer tube of the anterior sheath tube 1, 2 is a blood vessel, 3 is a thrombus, 4 is a crushing cavity, 5 is a posterior sheath tube, 501 is a crusher, 502 is a core tube, 503 is a thrombus distal end outer tube of the posterior sheath tube, 504 is a posterior occlusion balloon, 505 is a thrombus proximal end outer tube of the posterior sheath tube, 506 is a balloon expansion nut, 507 is a ring, 508 is an inner tube of the posterior sheath tube, 509 is a small nut, 510 is a ring, 511 is a drainage hole, 512 is a jet hole, 513 is a convex rib, 6 is a pulse water supply tube, 7 is a

liquid supply system

701, 702 is a pressure \ flow controller, 801 is an ultrasonic excitation system, 802 is an ultrasonic generator, 803 is an amplitude transformer, 804 is an oscillation cavity, and 9 is a thrombus removal control CPU, 10 is a suction system, 1001 is a suction pump, 1002 is a plug suction control device, 1003 is a communicating pipe, 11 is a plug monitoring control device, 12 is a crushing area pressure monitoring device, 13 is an X-ray probe, 14 is a grid-shaped frame, and 15 is an elastic film.

Detailed Description

Example (b): see fig. 1-5.

The invention discloses a sheath tube for a thrombus crushing system, which comprises a front sheath tube 1 and a rear sheath tube 5 which are arranged in a blood vessel 2 and are relatively independent, wherein the outer parts of the rear end of the front sheath tube 1 and the front end of the rear sheath tube 5 are respectively sleeved with a plugging balloon, namely a front plugging balloon 105 and a rear plugging balloon 504, the front plugging balloon 105 and the rear plugging balloon 504 are respectively positioned at two sides of a thrombus 3 in the blood vessel, and a crushing cavity 4 is formed between the front plugging balloon 105 and the rear plugging balloon 504; the front blocking saccule 105 and the rear blocking saccule 504 are squeezed or loosened by external force to expand or contract in the blood vessel 2 so as to block or open the thrombus, a core tube 502 coaxially penetrating the rear sheathing tube 5 is arranged in the rear sheathing tube, and a crusher 501 for crushing the thrombus is arranged at the front end of the core tube 502.

The invention belongs to a medical instrument used in an interventional operation method, and relates to an instrument for crushing, extracting and discharging sediments in blood vessels.

At the position where the thrombus is found, the front sheath tube 1 is firstly placed at the front end of the thrombus in the blood vessel, the front plugging saccule 105 is expanded to plug the front end of the blood vessel until the front end is attached to the inner wall of the blood vessel 2, and then the rear sheath tube 5 is placed at the rear end of the thrombus 3 to expand the rear plugging saccule 504 until the rear plugging saccule is attached to the inner wall of the blood vessel 2; the thrombus 3 is occluded between the two balloons and the enclosed area is the rupture chamber 4. After the front sheath 1 and the rear sheath 5 are inserted into the blood vessel and the thrombus is blocked, the crusher 501 crushes the thrombus, and the crushed thrombus fragments are discharged through the drain tube 511.

The breakers 501 are jet holes 512 distributed on the front end wall surface of the core pipe 502, the tail end of the core pipe 502 is communicated with a conveying pipeline of a breaking medium, and the breaking medium is sprayed out by the breakers 501 to break thrombus.

For example, water may be the optional thrombus disruption medium, and it is contemplated that other media may be used in place of water as the disruption medium, such as air flow. The pulse water supply pipe 6 is connected with the core pipe 502, the front end of the core pipe 502 is provided with jet holes 512 distributed on the front end wall surface of the core pipe 502, each jet hole 512 constitutes a crusher 501, and the pulse water is sprayed out by the crushers 501 to crush the thrombus.

The jet holes 512 are arranged on the wall surface 502 of the core pipe in a layered mode at intervals in sequence according to the arrangement rule of the straight holes and the inclined holes by the aid of the circumferences, the axes of the straight holes are perpendicular to the wall surface of the core pipe, the included angle a between the axes of the inclined holes and the axis direction of the core pipe is 0-90 degrees, the jet holes 512 are distributed on the wall surface 1-20 mm away from the front end of the core pipe 502, and 8-20 layers are arranged in total.

Adopt the structure of straight hole and inclined hole layering interval arrangement, can follow different angles and strike the thrombus, and equidirectional spun water column forms the vortex, can be comparatively even with the thrombus breakage for less granule, the broken size of thrombus that has avoided the water column of same direction to cause differs from, the granule is slightly big a bit neither broken once more easily, is difficult to again discharge from the pipe 511 of excreting.

In a preferred embodiment, the front sheath 1 and the rear sheath 5 each include a hollow inner tube with both closed ends, the front occlusion balloon 105 and the rear occlusion balloon 504 are respectively sleeved outside the respective inner tubes, the inner tubes of the front sheath 1 and the rear sheath 5 are externally sleeved with an outer tube, 101 is the inner tube of the front sheath, 508 is the inner tube of the rear sheath, the outer tubes are divided into a thrombus distal outer tube and a thrombus proximal outer tube, in the figure, 104 and 106 are the thrombus distal outer tube and the thrombus proximal outer tube of the front sheath 1, respectively, and 503 and 505 are the thrombus distal outer tube and the thrombus proximal outer tube of the rear sheath, respectively. The front plugging balloon 105 and the rear plugging balloon 504 are sleeved outside the inner tube between the two outer tubes; the outer tube at the distal end of the thrombus is sleeved with a balloon expansion nut, which is marked as 103 and 506 in the figure, the outer end of the balloon expansion nut is statically connected with the inner tube, and the inner end of the balloon expansion nut is matched and sleeved with the outer tube at the distal end of the thrombus through threads; the front occlusion balloon 105 is axially extruded or released by the thrombus distal end outer tube to realize expansion and contraction.

At the position of finding the thrombus, the front sheath tube 1 is firstly placed at the front end of the thrombus in the blood vessel, and the balloon expansion nut 103 on the sheath tube of the front sheath tube 1 is rotated to enable the thrombus far-end outer tube 104 of the front sheath tube 1 to move towards the thrombus near end along the inner tube 101, so that the front occlusion balloon 105 is expanded until the front occlusion balloon 105 props up the blood vessel 2 and is attached to the inner wall of the blood vessel, and the near-end protection is realized; the rear sheath 5 is placed at the right end of the thrombus 3, the balloon expansion nut 506 on the rear sheath is rotated, so that the thrombus near-end outer tube 505 of the rear sheath can move to the thrombus end along the inner tube 508 of the rear sheath, and the rear occlusion balloon 504 is expanded until being attached to the inner wall of the blood vessel 2, and fine thrombus fragments are prevented from flowing to the far end; the thrombus is occluded between the two balloons. After the front sheath 1 and the rear sheath 5 are both placed in the blood vessel and the thrombus is blocked, the water supply system is started, the pulse water flows through the fragmenter 501 via the pulse water supply pipe 6 and then is sprayed out via the jet hole 512 to fragment the thrombus 3, and the fragmented thrombus fragments are sucked by the suction system 10 and are all discharged from the drainage pipe 511.

The lower end of the inner tube 508 of the rear sheath is provided with a connection port connected with the drain tube 511. The drainage tube 511 can refer to the connection mode of the embodiment, and can also be connected with the inner tube of the rear sheath tube in other modes as long as the drainage tube is communicated with the crushing cavity to discharge thrombus fragments.

The two ends of the front occlusion balloon 105 are fixedly connected with the thrombus distal end outer tube 104 and the thrombus proximal end outer tube 106 of the front sheath tube 1, respectively, and the two ends of the rear occlusion balloon 504 are fixedly connected with the thrombus distal end outer tube 503 and the thrombus proximal end outer tube 505 of the rear sheath tube 5, respectively.

The frames of the front occlusion balloon 105 and the rear occlusion balloon 504 are both a grid-shaped frame 14 woven by elastic metal wires, and the outside of the frame is coated with a closed elastic film 15.

The elastic metal wire weaved latticed front and back plugging saccule is covered by the elastic film, so that when the saccule expansion and contraction nut is loosened, the elastic film is in a loose state, but still has a spherical frame structure, when the front and back of the thrombus need to be plugged, the saccule expansion and contraction nut is only needed to be screwed slightly to extrude the saccule to deform. Of course, the structure of the front and rear plugging balloons is not limited to this, and a simple inflatable structure may be adopted to communicate the front and rear plugging balloons with the inflatable structure.

A radial gap is formed between the core tube 502 and the inner tube wall of the rear sheath tube 5, a plurality of groups of convex ribs 513 are distributed in the inner tube 508 of the rear sheath tube, and each group of convex ribs is more than three, is uniformly distributed on the inner cylindrical surface of the inner tube 508 and is parallel to the axis of the inner tube; the flow area formed by the ribs, the outer cylindrical surface of the core tube 502 and the inner cylindrical surface of the inner tube 508 is not smaller than the flow area of the core tube 502.

The outer ends of the balloon expansion and

contraction nuts

103 and 506 are respectively provided with an annular groove, and the balloon expansion and contraction nuts are fixedly connected with respective inner pipes through

rings

102 and 510 arranged in the annular grooves; a small nut 509 is sleeved outside the right end of the core tube 502, the outer end of the small nut 509 is also provided with an annular groove, the small nut is fixedly connected with the core tube 502 through a ring 510 arranged in the annular groove, and the other end of the small nut is matched with an inner tube 508 of the rear sheath tube through threads; the balloon expansion and

contraction nuts

103 and 506 and the small nut 509 are all hollow cylindrical structures with bottoms, annular grooves are formed in the cylindrical bottoms, respective rings are embedded in the annular grooves, and a certain gap is formed between the rings and the annular grooves.

The following briefly describes the practical principle of the sheath tube for the thrombus disruption system of the present invention, applied to the ultrasonic thrombus disruption system of this embodiment:

the names of the parts in the figure are the liquid supply system 7, the destopper control CPU9, the suction system 10, the breaker monitoring and control device 11, the breaker pressure monitoring device 12 and the visual probe 13 located outside the breaker chamber 3; the liquid supply system 7 is composed of a liquid supply pump 701 and a pressure/flow controller 702; the liquid feed pump 701 is connected to the input of the pressure/flow controller 702; the suction system comprises a suction pump 1001 and a broken bolt suction control device 1002, wherein the broken bolt suction control device 1002 is connected with a drainage pipe 511 through a communication pipe 1003; the thrombectomy control CPU9 is respectively connected with the ultrasonic generator 801, the thrombectomy suction control device 1002, the pressure/flow controller 702, the thrombectomy monitoring control device 11 and the pressure monitoring device 12 in the crushing area; the broken bolt monitoring and controlling device 11 is connected with an X-ray probe 13 positioned outside the broken cavity, the broken area pressure monitoring device 12 is a micro-pressure sensor, and the broken area pressure monitoring device 12 is connected between the pressure/flow controller 702 and the valve body 8407 of the oscillation cavity 804.

After the front sheath 1 and the rear sheath 5 are placed in the blood vessel and the thrombus is blocked, the ultrasonic excitation system 8, the liquid supply system 7, the suction system 10 and the thrombus breaking monitoring control device 11 are respectively started through the thrombus removal control CPU 9.

By rotating the small nut 509 of the sheath tube 5, the core tube 502 can move to the proximal end of the thrombus in the inner tube 508, and thus move to the position of the thrombus 3; when the knapper 501 is close to the thrombus 3, the liquid supply system 7 supplies liquid to the knapper 501 according to the set liquid supply pressure and flow rate under the coordination of the thrombus removal control CPU; meanwhile, the ultrasonic generator 801 generates 15-20KHz high-frequency electric pulses, the amplitude transformer 803 obtains high-frequency and micro-amplitude mechanical vibration through the ultrasonic transducer 802, the mechanical vibration excites the high-pressure liquid medium in the oscillation cavity 804 to generate resonance, and the high-pressure liquid medium is converted into 15-20KHz pulse jet flow which enters the tail end of the core pipe of the back sheath pipe 5 at a high speed after being subjected to secondary acceleration from the discharge port of the oscillation cavity and is sprayed out from the jet hole 512 of the crusher 501 to impact, cut, crush and separate thrombus deposited in the blood vessel, so that the thrombus is fine fragments and is suspended in the liquid medium in the crushing cavity 4.

When the high-speed pulse jet flows out of the fragmenter 501 to fragment the thrombus 3, the thrombus removal control CPU coordinates with the fragmental thrombus suction control device 1002 of the suction system 10, and the liquid supply flow is used as the working flow of the suction pump 1001, so that the liquid supply requirement required by thrombus fragmentation can be ensured, fragmented thrombus fragments can be discharged out of the blood vessel, and a vacuum area does not appear in the blood vessel in the thrombus removal process.

The actual pressure signal of the liquid medium in the thrombus crushing area is acquired in real time through a micro-pressure sensor of the pressure monitoring device 12 in the crushing area, is transmitted to a thrombus removal control CPU through the micro-pressure sensor, and is fed back to a pressure/flow controller 702 in a liquid supply system 7 after being compared with a preset pressure parameter, so that the output pressure of the liquid supply system is regulated, the pressure requirement of pulse jet flow of the crushed thrombus can be ensured, and the pressure safety of the crushing area can also be ensured.

Acquiring image information such as the position, size, and blockage of the thrombus 3 before the thrombus is broken by the X-ray probe 13 with the help of a contrast agent; in the ultrasonic disruption process, the size of the particle size of the blood thrombus after disruption and the image of thrombus cleaning are obtained, and the image information is displayed after being processed by a thrombus removal control CPU. Based on the image information, the blood vessel is cleared of all thrombus or plaque until the blood vessel is unobstructed.

The invention adopts plugging type thrombus removal, so that broken thrombus fragments can flow to a far-end blood vessel, and secondary embolism is avoided; therefore, the sheath tube of the invention can be applied to most of the thrombus removing systems in the prior art, and the sheath tube and the corresponding structure can be simply replaced.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent modifications made by the present invention and the contents of the drawings or directly or indirectly applied to the related technical fields are included in the scope of the present invention.

Claims

1. A sheath tube for a thrombus crushing system comprises a front sheath tube (1) and a rear sheath tube (5) which are placed in a blood vessel (2) and are relatively independent, wherein the outer parts of the rear end of the front sheath tube (1) and the front end of the rear sheath tube (5) are respectively sleeved with a blocking saccule which is respectively a front blocking saccule (105) and a rear blocking saccule (504), the front blocking saccule (105) and the rear blocking saccule (504) are respectively positioned at two sides of a thrombus (3) in the blood vessel, and a crushing cavity (4) is formed between the front blocking saccule and the rear blocking saccule; the front occlusion saccule (105) and the rear occlusion saccule (504) are extruded or relaxed by external force to expand or contract in the blood vessel (2) to occlude or open the thrombus, and the utility model is characterized in that: the frames of the front occlusion saccule (105) and the rear occlusion saccule (504) are both grid-shaped frames (14) woven by elastic metal wires, and the outside of the frames is coated with a closed elastic film (15); a core pipe (502) which coaxially penetrates through the rear sheath pipe (5) is arranged in the rear sheath pipe, and the front end of the core pipe (502) is a crusher (501) for crushing thrombus; the front sheath tube (1) and the rear sheath tube (5) respectively comprise hollow inner tubes with two closed ends, a front plugging saccule (105) and a rear plugging saccule (504) are respectively sleeved outside the inner tubes, outer tubes are sleeved outside the inner tubes of the front sheath tube (1) (1) and the rear sheath tube (5), the outer tubes are divided into a thrombus far-end outer tube and a thrombus near-end outer tube, and the front plugging saccule (105) and the rear plugging saccule (504) are sleeved outside the inner tube between the two sections of outer tubes; the outer tube at the far end of the thrombus is sleeved with a balloon expansion nut, the outer end of the balloon expansion nut is statically connected with the inner tube, and the inner end of the balloon expansion nut is matched and sleeved with the outer tube at the far end of the thrombus through threads; the front occlusion saccule (105) realizes the expansion and contraction by axially extruding or releasing the thrombus far-end outer tube.

2. The sheath for a thrombus disruption system according to claim 1, wherein: the breaking device (501) is jet holes (512) distributed on the front end wall surface of the core pipe (502), the tail end of the core pipe (502) is communicated with a conveying pipeline of a breaking medium, and the breaking medium is sprayed out by the breaking device (501) to break thrombus.

3. The sheath for a thrombus disruption system according to claim 2, wherein: the jet holes (512) are arranged on the wall surface (502) of the core pipe in a layered mode according to the arrangement rule of the straight holes and the inclined holes at intervals in sequence, the axis of each straight hole is perpendicular to the wall surface of the core pipe, the included angle a between the axis of each inclined hole and the axis direction of the core pipe is 0-90 degrees, the jet holes (512) are distributed on the wall surface 1-20 mm away from the front end of the core pipe (502), and 8-20 layers are arranged in total.

4. The sheath for a thrombus disruption system according to claim 3, wherein: the lower end of the inner tube (508) of the rear sheath tube is provided with a connecting port connected with a drainage tube (511).

5. The sheath for a thrombus disruption system according to claim 3, wherein: two ends of the front plugging saccule (105) are respectively and fixedly connected with the thrombus far-end outer tube (104) and the thrombus near-end outer tube (106) of the front sheath tube (1), and two ends of the rear plugging saccule (504) are respectively and fixedly connected with the thrombus far-end outer tube (503) and the thrombus near-end outer tube (505) of the rear sheath tube (5).

6. The ultrasonic thrombectomy system of claim 1, wherein: a radial gap is formed between the core tube (502) and the inner tube wall of the rear sheathing tube (5), a plurality of groups of convex ribs (513) are distributed in the inner tube (508) of the rear sheathing tube, and each group of convex ribs is more than three, is uniformly distributed on the inner cylindrical surface of the inner tube (508) and is parallel to the axis of the inner tube; the flow area formed by the convex ribs, the outer cylindrical surface of the core pipe (502) and the inner cylindrical surface of the inner pipe (508) is not less than that of the core pipe (502).