CN102335464B - Injection and suction pump for removing thrombus - Google Patents

Abstract

The invention provides an injection pump for thrombus removal, which comprises a pump barrel, a pump barrel seat and an injection pump piston. The injection and pumping piston includes a push-pull rod, a piston body and an injection and pumping rod that are connected in sequence. The piston body is arranged in the pump barrel to separate the inner cavity of the pump barrel into a front cavity and a rear cavity. The front cavity is the injection cavity, and the rear cavity It is a suction cavity; a first channel and a second channel which are not communicated with each other are arranged in the injection rod; the first channel communicates with the injection cavity; the second channel communicates with the suction cavity. The thrombus removal pump of the present invention is used in conjunction with an interventional thrombus scraping device, and can expel thrombus clots scraped off from local veins with thrombus deposition at any time as required. While aspirating the crushed thrombus, inject an equal amount of normal saline or heparin, so that a stable input-output balance can be formed in the local venous segment with thrombus deposition, ensuring negative pressure in the venous segment during the process of pumping and crushing the thrombus. The pressure should not be too large to cause blood vessel damage or affect the effect of thrombus extraction.

Description

Syringe pump for thrombus removal

technical field

The invention relates to a medical instrument, in particular to an injection pump for thrombus removal used in conjunction with an interventional thrombus removal surgical instrument.

Background technique

In recent years, the incidence of deep vein thrombosis of the lower extremities has shown an increasing trend. Venous thrombosis can lead to long-term swelling of the lower limbs, varicose veins, ulceration and so on. In more serious cases, venous thrombus dislodges and transfers to organs, which can lead to fatal complications. For example, a blood clot in a vein migrates to the lungs and deposits, resulting in the death of a patient from a pulmonary embolism. Using minimally invasive interventional surgery, a tiny incision is percutaneously punctured to insert special thrombus removal surgical instruments into the vein, and direct contact thrombolysis and thrombus removal are performed under X-ray fluoroscopy. Compared with medical drug therapy and conventional surgical treatment, minimally invasive interventional surgery therapy has the advantages of quick effect, less trauma to patients, and little influence on the depth of venous thrombosis deposition site.

It is found through document retrieval of the prior art that the Chinese utility model patent "Venous Thrombectomy Tube" (authorized announcement number CN2659350Y) with the patent number ZL200320121061.0 discloses a vein thrombus retrieval tube. This patent consists of 3 parts: a stylet, a thrombus removal tube, and a balloon. The advantage is that deep vein thrombosis can be removed from the extremities without damaging the venous valve. The Chinese utility model patent "vascular thrombus retrieval catheter" (authorized announcement number CN2268496Y) with the patent number ZL96245233.5 discloses a blood vessel thrombus retrieval catheter. The patent is actually a dual-lumen catheter, one of which is connected to a balloon for supplying liquid or gas to inflate the balloon; the other lumen is used for blood jet flow. The advantage of this patent is that it can automatically judge whether the tip of the catheter has reached the position of the thrombus. The Chinese utility model patent "thrombosis remover" (authorized announcement number CN201042451Y) with the patent number of ZL200620164685.4 discloses a kind of thrombus retriever. The patent adopts an umbrella structure made of memory alloy wire to scrape thrombus, and uses a sleeve to discharge the scraped thrombus out of the body. The patent uses a metal wire instead of a balloon for thrombus scraping, which can improve the curettage effect. The common point of the above three patents is that all of them directly use the thrombus removal element to force the thrombus to separate from the inner wall of the blood vessel. The detached small thrombus may partly enter the blood of the human body in two directions and transfer to other parts or organs, and cannot be completely excreted from the body, resulting in the potential risk of organ embolism.

Application No. is 92106702.X's Chinese invention patent "catheter for removing internal organ vascular embolus" (publication number is CN1072867A) discloses a kind of catheter for obtaining internal organ vascular embolus. This patent consists of an inner catheter with a balloon and an outer cannula with a bell mouth and side holes for collecting broken thrombus. This patent already considers the collection of broken thrombus clots. However, the bell mouth of this patent is a rigid structure with a fixed size, which cannot adapt to the thickness of blood vessels of different patients. There are also some side holes in the vicinity, all of which will lead to the possibility that some broken and small thrombus remains in the blood vessel and cannot be completely discharged from the body.

The Chinese utility model patent "Sliding Combined Catheter for Treating Thrombosis" (authorized announcement number CN201192520Y) with patent number ZL200820098250.3 discloses a sliding combined catheter for treating thrombus. This patent consists of a core tube and a sleeve tube, and the head ends of the core tube and the sleeve tube are connected with a balloon respectively. The patent intends to scrape the thrombus by dragging the balloon at the head end of the cannula back and forth, while the balloon at the head end of the core tube is specially used to block the upper end of the vein segment with thrombus deposition. The advantage of this patent is that an element is specially arranged to prevent the remaining of the broken thrombus. However, since this patent only blocks one end of the vein section where the thrombus is deposited, and the other end is still in an open state, it still cannot guarantee that all the broken thrombus will be removed. All thrombus clots are expelled from the body.

None of the above-mentioned prior art solves one of the core problems of the thrombus removal operation: completely expelling the thrombus that has been detached from the vessel wall. Based on this situation, the most ideal solution is: before the start of the thrombus removal process, temporarily block both ends of the local vein segment with thrombus deposition. It is excreted from the body through a special channel. In order to realize this solution, in addition to the special surgical instruments that can block both ends of the thrombus deposition section of the vein and scrape off the thrombus, it is also necessary to have a matching suction device so that the scraped thrombus can be scraped off at any time as needed. The block is excreted from the body. In order to prevent the negative pressure in the occluded local venous segment from being too large to cause blood vessel damage or affect the effect of thrombus suction during the process of suctioning the broken thrombus, the equipped suction device should also meet the following requirements: When the broken thrombus is sucked into the blocked local vein segment, an equal amount of normal saline or heparin should be injected into the local vein segment at the same time.

It is found through document retrieval of the prior art that the Chinese invention patent "Self-Destructing Safety Syringe" (authorized announcement number CN1226059C) with the patent number of ZL03128859.6 discloses a self-destructing safety syringe. The patented needle holder has dual functions of fixing with the jacket and automatically releasing to retract the needle, and once the core rod is pushed to the bottom of the jacket, it can be automatically locked and self-destructed.

The Chinese utility model patent "Cardiovascular Guidewire Intervention Syringe" (authorized announcement number CN201123940Y) with the patent number ZL200720028672.9 discloses a cardiovascular guidewire interventional syringe. The Chinese utility model patent "Syringe for Cardiovascular Intervention" with the patent number ZL200820021308.4 (authorized announcement number is CN201197836Y) discloses a syringe for cardiovascular intervention. The Chinese utility model patent "A Cardiovascular Intervention Syringe" (authorized announcement number CN201399124Y) with the patent number ZL200920024882.X discloses a cardiovascular interventional syringe. These three patents all use plungers with annular cross-sections to inject drugs through the annular cross-section cavity between the syringe and the axial tube. A guide wire can be inserted to prevent blood from leaking out.

The Chinese utility model patent "two-way injector" (authorized announcement number CN201171836Y) with the patent number ZL200820019117.4 discloses a two-way injector. This patent has two injection chambers, which can discharge the aspirated material in batches without interruption in a relatively sealed range.

The above-mentioned prior art cannot meet the basic requirements of the suction device used in thrombus curettage surgery, and cannot simultaneously extract the broken thrombus and inject normal saline (or heparin) at the same flow rate.

Contents of the invention

The object of the present invention is to provide a pump for thrombus removal in order to solve the above problems. Therefore, clinicians, especially those who perform minimally invasive surgery, can directly extract the fragmented thrombus scraped off from the blood vessel wall from the local vein segment with thrombus deposition at any time, so as to avoid the part of the fragmented thrombus in the blood vessel. Residual, to prevent the hidden danger of organ embolism.

In order to achieve the above object, the present invention adopts the following technical solutions: a pump for thrombus removal, comprising:

The pump barrel is a cylindrical structural member, including an open end and a closed end, and a through hole is arranged in the middle of the closed end;

The pump barrel seat is connected to the open end of the pump barrel and the open end is closed, and a through hole is arranged in the middle of the pump barrel seat;

The injection and pumping piston includes a push-pull rod, a piston body and an injection and pumping rod connected in sequence. The piston body is arranged in the pump barrel to divide the inner cavity of the pump barrel into a front cavity and a rear cavity. The front cavity is the injection cavity, and the rear cavity is the injection cavity. The suction chamber; the push-pull rod crosses the through hole in the middle of the pump cylinder seat and connects with the tail end of the piston body; the injection rod crosses the through hole in the middle of the closed end of the pump cylinder and connects with the head end of the piston body;

The first channel and the second channel which are not connected to each other are arranged in the injection rod; the head end of the first channel communicates with the outside world through an injection joint, and the tail end of the first channel communicates with the injection cavity; The head end communicates with the outside world through a suction joint opening to the side, and the tail end of the second channel communicates with the suction chamber through the piston body;

The diameter of the push-pull rod is the same as that of the injector-pump rod.

There are two radial extension feet and a long rod-shaped extension foot extending outward on the pump barrel seat, and the extension direction of the long rod-shaped extension foot is perpendicular to the extension of the two radial extension feet. Direction; the tail end of the push-pull rod is provided with a T-shaped handle, and the extension direction of the T-shaped handle is consistent with the extension direction of the two radially extending feet on the pump barrel base.

A piston ring is embedded on the piston body, and the piston ring is closely attached to the inner wall of the pump barrel; an upper sealing ring is embedded in the through hole in the middle of the closed end of the pump barrel, and the upper sealing ring is connected with the pumping pump. The outer wall of the rod is closely attached; the through hole in the middle of the pump barrel seat is embedded with a lower sealing ring, and the lower sealing ring is closely attached to the outer wall of the push-pull rod.

Compared with the prior art, the injection pump for thrombus removal of the present invention has the following advantages and characteristics due to the adoption of the above technical scheme:

1. By adopting the injection pump for thrombus removal of the present invention, the scraped-off thrombus can be discharged from the body at any time as required;

2. Using the injection pump for thrombus removal of the present invention, while aspirating the broken thrombus from the local venous segment with thrombus deposition, an equal amount of normal saline or heparin is also injected into the local venous segment, so that it can be used when there is thrombus A stable input-output balance is formed in the deposited local venous segment to ensure that the negative pressure in the venous segment will not be too large to cause blood vessel damage or affect the thrombus pumping effect during the process of suctioning and breaking the thrombus.

3. The injection pump for removing thrombus of the present invention is simple in structure and easy to operate, and can be produced by using conventional industrial manufacturing techniques and commonly used medical polymer materials.

4. The present invention is suitable for curettage of venous thrombus in human extremities, especially suitable for scraping deep thrombus in femoral vein of human body by using percutaneous minimally invasive surgery technology.

Description of drawings

Fig. 1 is the schematic diagram of the three-dimensional structure of the pump for thrombus removal according to the present invention;

Fig. 2 is a schematic cross-sectional structural view of the injection pump for thrombus removal according to the present invention;

Fig. 3 is a schematic diagram of the three-dimensional structure of the injecting and pumping piston in the present invention.

Detailed ways

Referring to FIG. 1 , with reference to FIG. 2 and FIG. 3 , the injection pump for thrombus removal according to the present invention includes a pump cylinder 1 , a pump cylinder seat 2 and an injection-suction piston 3 .

The pump barrel 1 is a cylindrical structural member, including an open end and a closed end, and a through hole is arranged in the middle of the closed end.

The pump barrel seat 2 is connected to the opening end of the pump barrel and the opening end is closed. There is a through hole in the middle of the pump barrel seat; two radial extension feet 21 distributed at 180 degrees and a long rod extend outward on the pump barrel seat. Stretch out pin 22, and the protruding direction of long bar-shaped pin 22 is perpendicular to the protruding direction of two radial pins 21. The long rod-shaped extension foot 22 cooperates with the T-shaped handle 311 on the push-pull rod 31 to suck physiological saline or heparin into the injection cavity of the pump barrel. The two radial extension feet 21 cooperate with the T-shaped handle 311 on the push-pull rod 31 to push out the normal saline or heparin from the injection chamber of the pump barrel, and simultaneously push the normal saline (or heparin), crushed thrombus and A small amount of venous blood mixture is drawn into the suction chamber of the pump barrel.

The pumping piston 3 includes a push-pull rod 31, a piston body 32 and a pumping rod 33 that are connected in sequence, and the piston body 32 is arranged in the pump cylinder to separate the inner chamber of the pump cylinder 1 into a front chamber 11 and a rear chamber 12. 11 is an injection cavity, and the rear cavity 12 is a suction cavity. The push-pull rod 31 spans the through hole in the middle of the pump barrel base 2 and is connected to the tail end of the piston body 32; A first channel 331 and a second channel 332 that are not connected to each other are provided in the injection rod 33; the head end of the first channel 331 communicates with the outside world through an injection joint 333, and the tail end of the first channel 331 communicates with the injection cavity 11 The head end of the second channel 332 communicates with the outside world through a suction joint 334 opening to the side, and the tail end of the second channel 332 communicates with the suction chamber 12 through the piston body 32 . A T-shaped handle 311 is provided at the tail end of the push-pull rod 31 , and the extending direction of the T-shaped handle 311 is consistent with the extending direction of the two radially extending feet 21 on the pump barrel seat.

The diameter of the above-mentioned push-pull rod 31 is the same as that of the injection-extraction rod 33 .

A piston ring 41 is embedded on the piston body 32, and the piston ring is closely attached to the inner wall of the pump barrel 1; an upper sealing ring 42 is embedded in the through hole in the middle of the closed end of the pump barrel 1, and the upper sealing ring 42 is in contact with the inner wall of the pump barrel 1. The outer wall of the pumping rod 33 is closely attached; a lower sealing ring 43 is embedded in the through hole in the middle of the pump barrel seat 2 , and the lower sealing ring 43 is closely attached to the outer wall of the push-pull rod 31 .

The injection pump for thrombus removal of the present invention is used in conjunction with an interventional thrombus scraping device. Its working principle is to first suck physiological saline or heparin into the injection cavity 11 of the pump cylinder 1 through the first channel 331, and then insert the injection connector 333 and suction joint 334 are respectively connected with the corresponding joints of the interventional thrombus scraping device, push the push-pull rod 31, and inject physiological saline or heparin from the injection chamber 11 of the pump cylinder 1 to a designated local segment of the human vein. At the same time, the mixture of physiological saline (or heparin), crushed thrombus and a small amount of venous blood in the designated local section of the corresponding human vein is sucked into the suction cavity 12 of the pump barrel 1 through the second channel 332 . Since the diameter of the push-pull rod 31 is identical to the diameter of the injection and pump-out rod 33, the volume reduction of the injection chamber 11 of the pump cylinder 1 is equal to the increase in the volume of the suction chamber 12 in the process of pushing the push-pull rod 31, realizing normal saline ( or heparin) into the vein and the mixture of saline (or heparin), crushed thrombus and a small amount of venous blood is withdrawn from the vein simultaneously and isochronously.

Claims (2)

1. removing thrombus is taken out a pump with note, it is characterized in that comprising:

Pump barrel, is columnar structured, comprises opening and blind end, is provided with through hole in the middle of blind end;

Pump barrel seat, is connected to the opening of pump barrel and by opening sealing, is provided with through hole in the middle of pump barrel seat;

Note is taken out piston, comprises push-pull bar, piston body and note pumping rod that order is connected, and piston body is arranged in pump barrel the inner chamber of pump barrel is separated into ante-chamber and back cavity, and ante-chamber is injecting cavity, and back cavity is suction chamber; The through hole that push-pull bar is crossed in the middle of pump barrel seat is connected with the tail end of piston body; The through hole that note pumping rod is crossed in the middle of pump barrel blind end is connected with the head end of piston body;

In described note pumping rod, be provided with not connected first passage and second channel; The head end of first passage is in communication with the outside by an injection joint, and the tail end of first passage is communicated with injecting cavity; The head end of second channel is in communication with the outside by a suction joint to lateral opening, and the tail end of second channel is communicated with suction chamber through piston body;

The diameter of described push-pull bar is identical with the diameter of note pumping rod.

2. removing thrombus as claimed in claim 1 is taken out pump with note, it is characterized in that: on described piston body, be embedded with piston ring, the inwall of this piston ring and pump barrel fits tightly; In through hole in the middle of described pump barrel blind end, be embedded with upper sealing ring, this upper sealing ring fits tightly with the outer wall of note pumping rod; In through hole in the middle of described pump barrel seat, be embedded with lower sealing ring, the outer wall of this lower sealing ring and push-pull bar fits tightly.

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