Femoral artery cannula for blood perfusion of lower limbs

Abstract

A femoral artery cannula for blood perfusion of lower limbs, the cannula comprising an outer tube (1) and an inner tube (2), wherein the inner tube (2) is fixedly sleeved with the outer tube (1), a pl

Description

The present invention relates to the technical field of medical devices, and in particular, to a femoral artery cannula for providing lower limb blood perfusion. BACKGROUND A femoral artery cannula may block the blood flow of the femoral artery perfusion to the lower limbs, resulting in lower limb ischemia, and even amputation in severe ischemia. Patent no. CN 214911437 U discloses a VA-ECMO femoral artery cannula for providing lower limb blood perfusion, including a cannula body and a puncture guide core, a main cavity and a side cavity independent of each other being formed in the cannula body, the main cavity being a front-back through structure, an outer edge of a front end of the main cavity being provided with a main cavity side hole, the side cavity being wrapped around a periphery of a rear end portion of the main cavity, an outer edge of the side cavity being provided with a side cavity side hole along a same front-back straight line, an annular airbag being arranged on the cannula body at a position between the main cavity side hole and the side cavity side hole, a bulging airbag being provided at an extension line of a rear end of the side cavity side hole, and both the annular airbag and the bulging airbag being connected to airbag ports for inflation and deflation. There are still defects in this technical solution: In the technical solution, the liquid injection tube is directly exposed to the outside and is apt to being contaminated with bacteria during storage, and as a result, causing infection of injected blood during liquid injection. SUMMARY An objective of the present invention is to provide a femoral artery cannula for providing lower limb blood perfusion, to solve the problem that the liquid injection tube in the VA-ECMO femoral artery cannula for providing lower limb blood perfusion in the prior art is directly exposed to the outside and is apt to being contaminated with bacteria during storage, and as a result, causing infection of injected blood during liquid injection. To implement the foregoing objective, the present invention adopts the following technical solution. A femoral artery cannula for providing lower limb blood perfusion includes an outer tube and an inner tube. The inner tube is fixedly nested inside the outer tube, a lower surface of the outer tube is provided with a plurality of through holes, upper surfaces of outer sides of the outer tube and the inner tube are each provided with a through slot, two ends of lower sides of the two through slots are each fixedly provided with a sliding rod, a sliding plate is connected between the two sliding rods in a movably adjustable manner, a liquid injection tube is fixedly nested in an inner side of the sliding plate, lower sides of the two sliding plates are each provided with a transmission mechanism for pushing the liquid injection tubes to move, and outer sides of the through slots are each provided with a blocking mechanism. Preferably, the transmission mechanism includes a rotary rod and a cam, the rotary rod is arranged on the lower side of the sliding plate, two ends of the rotary rods are rotatably connected to side walls of the corresponding outer tube and inner tube through sealed bearings, the cam is fixedly nested on an outer wall of the rotary rod, the cam abuts against a lower surface of the sliding plate, one ends of the two rotary rods respectively extend to outer sides of the corresponding outer tube and inner tube and are each fixedly nested with a worm wheel, one side of the worm wheel is meshed with a worm, two ends of the worm are each rotatably connected to a side plate, and the plurality of side plates are respectively fixedly connected to outer walls of the corresponding outer tube and inner tube. Preferably, the blocking mechanism includes a blocking plate and an engaging block, the blocking plate is arranged against the outer side of the through slot, one ends of the two blocking plates are fixedly connected to outer walls of the corresponding outer tube and inner tube through connecting strips, the engaging block is fixedly arranged on an end of the corresponding blocking plate away from the connecting strip, and the outer walls of the outer tube and the inner tube close to the engaging blocks are each provided with an engaging slot, and the engaging blocks are engaged with the corresponding engaging slots. Preferably, rod walls of the plurality of sliding rods are all movably nested with springs, and two ends of the plurality of springs are fixedly connected to the corresponding sliding plates and outer walls of the outer tube and inner tube, respectively. Preferably, lower ends of the plurality of sliding rods are each fixedly provided with a stopper. Preferably, one ends of the two worms are each fixedly nested with a rotary wheel. Preferably, the blocking plates, the connecting strips, and the engaging blocks are all made of an antibacterial silica gel material. Compared with the prior art, the present invention provides a femoral artery cannula for providing lower limb blood perfusion, and has the following beneficial effects: 1. According to the femoral artery cannula for providing lower limb blood perfusion, by receiving the liquid injection tube in the cannula in a normal state, the liquid injection tube can be protected from contamination as much as possible, and by rotating the worm to drive the worm wheel to rotate, the rotary rod can drive the cam to rotate, that is, the liquid injection tube can be pushed out of the cannula, which is convenient to use. 2. According to the femoral artery cannula for providing lower limb blood perfusion, by providing a blocking plate against the outer wall of the through slot, an interior of the cannula can be blocked and protected in a normal state, so that foreign bodies can be effectively prevented from entering the cannula. The parts not involved in the apparatus are the same as those in the existing technology or can be implemented by using the existing technology, and according to the present invention, the liquid injection tube can be received in the cannula and taken out when used, so that the liquid injection tube can be protected from contamination as much as possible. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of a structure of a femoral artery cannula for providing lower limb blood perfusion according to the present invention; FIG. 2 is a schematic diagram of an integral structure of FIG. 1; FIG. 3 is a schematic structurally enlarged diagram of portion A in FIG. 1; and FIG. 4 is a schematic structurally enlarged diagram of portion B in FIG. 2. In the drawings: I. outer tube, 2. inner tube, 3. through hole, 4. sliding rod, 5 sliding plate, 6. liquid injection tube, 7. rotary rod, 8. cam, 9. worm wheel, 10. side plate, 11. worm, 12. rotary wheel, 13. spring, 14. stopper, 15. blocking plate, 16. connecting strip, and 17. engaging block. DETAILED DESCRIPTION The following clearly and completely describes the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. The described embodiments are some of the embodiments of the present invention rather than all of the embodiments. In the description of the present invention, it should be understood that orientation or position relationships indicated by the terms such as "on", "below", "front", "back", "left", "right", "top", "bottom”, "inner", and "outer" are based on orientation or position relationships shown in the accompanying drawings, and are used only for ease and brevity of illustration and description, rather than indicating or implying that the mentioned apparatus or component needs to have a particular orientation or need to be constructed and operated in a particular orientation. Therefore, such terms should not be construed as limiting of the present invention. Referring to FIG. 1 to FIG. 4, provided is a femoral artery cannula for providing lower limb blood perfusion, including an outer tube 1 and an inner tube 2. The inner tube 2 is fixedly nested inside the outer tube 1, a lower surface of the outer tube 1 is provided with a plurality of through holes 3, upper surfaces of outer sides of the outer tube 1 and the inner tube 2 are each provided with a through slot, two ends of lower sides of the two through slots are each fixedly provided with a sliding rod 4, a sliding plate 5 is connected between the two sliding rods 4 in a movably adjustable manner, a liquid injection tube 6 is fixedly nested in an inner side of the sliding plate 5, lower sides of the two sliding plates 5 are each provided with a transmission mechanism for pushing the liquid injection tubes 6 to move, and outer sides of the through slots are each provided with a blocking mechanism. The transmission mechanism includes a rotary rod 7 and a cam 8, the rotary rod 7 is arranged on the lower side of the sliding plate 5, two ends of the rotary rods 7 are rotatably connected to side walls of the corresponding outer tube 1 and inner tube 2 through sealed bearings, the cam 8 is fixedly nested on an outer wall of the rotary rod 7, the cam 8 abuts against a lower surface of the sliding plate 5, one ends of the two rotary rods 7 respectively extend to outer sides of the corresponding outer tube 1 and inner tube 2 and are each fixedly nested with a worm wheel 9, one side of the worm wheel 9 is meshed with a worm 11, two ends of the worm 11 are each rotatably connected to a side plate 10, and the plurality of side plates 10 are respectively fixedly connected to the outer walls of the corresponding outer tube 1 and inner tube 2. The blocking mechanism includes a blocking plate 15 and an engaging block 17, the blocking plate 15 is arranged against the outer side of the through slot, one ends of the two blocking plates 15 are fixedly connected to outer walls of the corresponding outer tube 1 and inner tube 2 through connecting strips 16, the engaging block 17 is fixedly arranged on an end of the corresponding blocking plate 15 away from the connecting strip 16, and the outer walls of the outer tube 1 and the inner tube 2 close to the engaging blocks 17 are each provided with an engaging slot, and the engaging blocks 17 are engaged with the corresponding engaging slots. Rod walls of the plurality of sliding rods 4 are all movably sleeved with springs 13, and two ends of the plurality of springs 13 are fixedly connected to the corresponding sliding plate 5 and outer walls of the corresponding outer tube 1 and inner tube 2, so that the sliding plates 5 can drive the liquid injection tubes 6 to reset and retract into the cannula. Lower ends of the plurality of sliding rods 4 are fixedly provided with stoppers 14, to prevent the sliding plates 5 from slipping off the rod walls of the sliding rods 4 as much as possible. One ends of the two worms 11 are each fixedly nested with a rotary wheel 12, to facilitate rotation of the worms 11. The blocking plates 15, the connecting strips 16, and the engaging blocks 17 are all made of an antibacterial silica gel material, which is convenient to open and has good antibacterial performance. In the present invention, during use, the liquid injection tube 6 is received in the cannula in a normal state, and therefore, the liquid injection tube can be protected from contamination as much as possible; the outer walls of the through slots are each provided with the blocking plate 15, an interior of the cannula can be blocked and protected in the normal state, so that foreign matters can be effectively prevented from entering the cannula; when connection is required, the worm 11 is rotated to drive the worm wheel 9 to rotate, and then the rotary rod 7 can drive the cam 8 to rotate, so that the liquid injection tube 6 can be pushed out of the cannula; the connection is facilitated; after being connected to the external blood transfusion tube, the inner tube 2 transfuses blood to a proximal end of the femoral artery, and the through hole on the side wall of the outer tube 1 transfuses blood to a distal end of the femoral artery, so that the blood is injected into the lower limbs to prevent lower limb ischemia. The foregoing descriptions are only preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent replacement or modification made by those skilled in the art according to the technical solution and the inventive concept of the present invention within the technical scope disclosed by the present invention should be fall within the scope of protection of the present invention.

Claims

1. A femoral artery cannula for providing lower limb blood perfusion, comprising an outer tube (1) and an inner tube (2), wherein the inner tube (2) is fixedly nested inside the outer tube (1), a lower surface of the outer tube (1) is provided with a plurality of through holes (3), upper surfaces of outer sides of the outer tube (1) and the inner tube (2) are each provided with a through slot, two ends of lower sides of the two through slots are each fixedly provided with a sliding rod (4), a sliding plate (5) is connected between the two sliding rods (4) in a movably adjustable manner, a liquid injection tube (6) is fixedly nested in an inner side of the sliding plate (5), lower sides of the two sliding plates (5) are each provided with a transmission mechanism for pushing the liquid injection tubes (6) to move, and outer sides of the through slots are each provided with a blocking mechanism.

2. The femoral artery cannula for providing lower limb blood perfusion according to claim 1, wherein the transmission mechanism comprises a rotary rod (7) and a cam (8), the rotary rod (7) is arranged on the lower side of the sliding plate (5), two ends of the rotary rods (7) are rotatably connected to side walls of the corresponding outer tube (1) and inner tube (2) through sealed bearings, the cam (8) is fixedly nested on an outer wall of the rotary rod (7), the cam (8) abuts against a lower surface of the sliding plate (5), one ends of the two rotary rods (7) respectively extend to outer sides of the corresponding outer tube (1) and inner tube (2) and are each fixedly nested with a worm wheel (9), one side of the worm wheel (9) is meshed with a worm (11), two ends of the worm (11) are each rotatably connected to a side plate (10), and the plurality of side plates (10) are respectively fixedly connected to outer walls of the corresponding outer tube (1) and inner tube (2).

3. The femoral artery cannula for providing lower limb blood perfusion according to claim 1, wherein the blocking mechanism comprises a blocking plate (15) and an engaging block (17), the blocking plate (15) is arranged against the outer side of the through slot, one ends of the two blocking plates (15) are fixedly connected to outer walls of the corresponding outer tube (1) and inner tube (2) through connecting strips (16), the engaging block (17) is fixedly arranged on an end of the corresponding blocking plate (15) away from the connecting strip (16), and the outer walls of the outer tube (1) and the inner tube (2) close to the engaging blocks (17) are each provided with an engaging slot, and the engaging blocks (17) are engaged with the corresponding engaging slots.

4. The femoral artery cannula for providing lower limb blood perfusion according to claim 1, wherein rod wallsofthe plurality of sliding rods (4) are all movably nested with springs (13), and two ends of the plurality of springs (13) are fixedly connected to the corresponding sliding plates (5) and outer walls of the outer tube (1) and inner tube (2), respectively.

5. The femoral artery cannula for providing lower limb blood perfusion according to claim 1, wherein lower ends of the plurality of sliding rods (4) are each fixedly provided with a stopper (14).

6. The femoral artery cannula for providing lower limb blood perfusion according to claim 2, wherein one ends of the two worms (11) are each fixedly nested with a rotary wheel (12).

7. The femoral artery cannula for providing lower limb blood perfusion according to claim 3, wherein the blocking plates (15), the connecting strips (16), and the engaging blocks (17) are all made of an antibacterial silica gel material.A. CLASSIFICATION OF SUBJECT MATTERA61Ml / 36(2006.01)iAccording to International Patent Classification (IPC) or to both national classification and IPCB. FIELDS SEARCHEDMinimum documentation searched (classification system followed by classification symbols) IPC: A61MDocumentation searched other than minimum documentation to the extent that such documents are included in the fields searchedElectronic data base consulted during the international search (name of data base and, where practicable, search terms used)CNABS, CNTXT, DWPI, ENTXT, CNKI: EiO, X, W*, ttM, WS, SISintubation, out, perfusion, port?, expos+, push+, inject+, cam, turboDOCUMENTS CONSIDERED TO BE RELEVANTCategory* Citation of document, with indication, where appropriate, of the relevant passages Relevant to claim No. PX CN 219595415 U (NANJING DRUM TOWER HOSPITAL) 29 August 2023 (2023-08-29) claims 1-7, description, paragraphs [0005]-[0032], and figures 1-4 1-7 A A CN 112915294 A (THE FIRST AFFILIATED HOSPITAL OF ANHUI MEDICAL UNIVERSITY) 08 June 2021 (2021-06-08) description, paragraphs [0019]-[0029], and figures 1-2 CN 114224041 A (HUBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY) 25 March 2022 (2022-03-25) entire document 1-7 1-7 A CN 201026340 Y (WANG JING YU) 27 February 2008 (2008-02-27) entire document 1-7 A A CN 113082452 A (WEST CHINA HOSPITAL, SICHUAN UNIVERSITY) 09 July 2021 (2021-07-09) entire document CN 205814842 U (ZHANG SHUCHUN) 21 December 2016 (2016-12-21) entire document 1-7 1-7| | Further documents are listed in the continuation of Box C.annex.* Special categories of cited documents:“A” document defining the general state of the art which is not considered to be of particular relevance“D” document cited by the applicant in tire international application“E” earlier application orpatent but published on or after the international“T”“O”“P”filing datedocument which may throw doubts on priority claim(s) or which is cited to establish the publication date of another citation or other special reason (as specified)document referring to an oral disclosure, use, exhibition or other meansdocument published prior to the international filing date but later than the priority date claimed‘Y’later document published after the international filing date or priority date and not in conflict with the application but cited to understand the principle or theory underlying the inventiondocument of particular relevance; the claimed invention cannot be considered novel or cannot be considered to involve an inventive step when the document is taken alonedocument of particular relevance; the claimed invention cannot be considered to involve an inventive step when the document is combined with one or more other such documents, such combination being obvious to a person skilled in the artdocument member of the same patent familyDate of the actual completion of the international searchDate of mailing of the international search report06 December 2023Name and mailing address of the ISA / CNChina National Intellectual Property Administration (ISA / CN)China No. 6, Xitucheng Road, Jimenqiao, Haidian District,Beijing 100088Authorized officer22 December 2023Telephone No.C. DOCUMENTS CONSIDERED TO BE RELEVANTCategory* Citation of document, with indication, where appropriate, of the relevant passages Relevant to claim No. A KR 20190091244 A (SAMSUNG LIFE PUBLIC WELFARE FOUNDATION) 05 August 2019 (2019-08-05) entire document 1-7 A WO 2020176968 Al (TOTAL FLOW CANNULA LTD.) 10 September 2020 (2020-09-10) entire document 1-7Information on patent family members 101«rt l / CIN2UZ3 / 12olobPatent document cited in search report Publication date (day / month / year) Patent family member(s) Publication date (day / month / year) CN 219595415 U 29 August 2023 None CN 112915294 A 08 June 2021 None CN 114224041 A 25 March 2022 None CN 201026340 Y 27 February 2008 None CN 113082452 A 09 July 2021 CN 113082452 B 17 February 2023 CN 205814842 U 21 December 2016 None KR 20190091244 A 05 August 2019 KR 102032447 Bl 15 October 2019 KR 20160103474 A 01 September 2016 WO 2016137212 Al 01 September 2016 US 2018043085 Al 15 February 2018 US 10449286 B2 22 October 2019 WO 2020176968 Al 10 September 2020 EP 3934728 Al 12 January 2022 US 2023166099 Al 01 June 2023 CA 3035749 Al 05 September 2020

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