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 plurality of through holes (3) are provided on a lower surface of the outer tube (1), a slot is provided in an upper surface of an outer side of each of the outer tube (1) and the inner tube (2), a sliding rod (4) is fixedly arranged at each of two ends of lower sides of the two slots, sliding plates (5) are movably adjusted between the two sliding rods (4), liquid infusion pipes (6) are fixedly sleeved with the sliding plates (5), transmission mechanisms for pushing the liquid infusion pipes (6) to move are arranged at lower sides of the two sliding plates (5), and a blocking mechanism is arranged outside of the slots. The present device can store the liquid infusion tubes (6) in the cannula and take out the liquid infusion tubes when in use, such that the liquid infusion tubes (6) can be prevented from being contaminated as much as possible.

Description

A femoral artery cannula for providing blood perfusion to the lower limbs Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a femoral artery cannula for providing blood perfusion to lower limbs. Background Art

[0002] Femoral artery catheterization may block the blood flow from the femoral artery to the lower limbs, causing lower limb ischemia. Severe ischemia may even require amputation.

[0003] Among them, announcement number CN214911437U discloses a VA-ECMO femoral artery cannula for providing blood perfusion of the lower limbs, including a cannula body and a puncture guide core, wherein the cannula body is internally formed with a main cavity and a side cavity that are independent of each other, wherein the main cavity is a front-to-back through structure, and a main cavity side hole is opened on the outer side of the front end of the main cavity, wherein the side cavity wraps around the outer periphery of the rear end part of the main cavity, and a side cavity side hole is opened on the outer side of the side cavity along the same front-to-back straight line, wherein the cannula body is provided with an annular airbag between the main cavity side hole and the side cavity side hole, and a bulging airbag is provided at the position extending along the rear end of the side cavity side hole, wherein both the annular airbag and the bulging airbag are connected with an airbag port for inflation and deflation, and there are still defects in this technical solution:

[0004] In this technical solution, the injection tube is directly exposed to the outside, which can easily be contaminated with bacteria during storage and easily cause infection in the injected blood during the injection process.

[0005] Summary of the Invention

[0006] The purpose of the present invention is to solve the problem in the prior art that the injection tube of the VA-ECMO femoral artery cannula for providing lower limb blood perfusion is directly exposed to the outside, which is easily contaminated with bacteria during storage and easily causes infection of the injected blood during the injection process. A femoral artery cannula for providing lower limb blood perfusion is proposed.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A femoral artery cannula for providing blood perfusion to the lower limbs comprises an outer tube and an inner tube, the inner tube being fixedly sleeved on the inside of the outer tube, a plurality of through holes being provided on the lower surface of the outer tube, through grooves being provided on the outer upper surfaces of the outer tube and the inner tube, slide bars being fixedly provided at both ends of the lower sides of the two through grooves, a slide plate being movably adjusted between the two slide bars, an injection tube being fixedly sleeved on the inside of the slide plates, a transmission mechanism for pushing the injection tube to move being provided on the lower sides of the two slide plates, and a blocking mechanism being provided on the outer side of the through grooves.

[0009] Preferably, the transmission mechanism includes a rotating rod and a cam, the rotating rod is arranged on the lower side of the slide, and both ends of the rotating rod are rotatably connected to the side walls of the corresponding outer tube and inner tube through sealed bearings, the cam is fixedly sleeved on the outer wall of the rotating rod, and the cam is in conflict with the lower surface of the slide, one end of the two rotating rods extends to the outside of the corresponding outer tube and inner tube respectively and is fixedly sleeved with a worm gear, a worm is meshed with one side of the worm gear, and both ends of the worm gear are rotatably connected to side plates, and multiple side plates are fixedly connected to the outer walls of the corresponding outer tube and inner tube respectively.

[0010] Preferably, the sealing mechanism includes a sealing plate and a clamping block, the sealing plates are arranged to abut against each other on the outside of the through groove, one end of the two sealing plates is fixedly connected to the outer walls of the corresponding outer tube and inner tube through a connecting strip, the clamping block is fixedly arranged at the end of the corresponding sealing plate away from the connecting strip, and the outer walls of the outer tube and the inner tube on one side close to the clamping block are provided with a clamping groove, and the clamping block is clamped with the corresponding clamping groove.

[0011] Preferably, the rod walls of the plurality of sliding rods are movably sleeved with springs, and the two ends of the plurality of springs are fixedly connected to the outer walls of the corresponding slide plates, outer tubes and inner tubes respectively.

[0012] Preferably, a stopper is fixedly provided at the lower end of each of the plurality of sliding rods.

[0013] Preferably, one end of each of the two worms is fixedly sleeved with a rotating wheel.

[0014] Preferably, the blocking plate, connecting strip and clamping block are all made of antibacterial silicone material.

[0015] Compared with the prior art, the present invention provides a femoral artery cannula for providing blood perfusion to the lower limbs, which has the following beneficial effects:

[0016] 1. The femoral artery cannula for providing lower limb blood perfusion can minimize contamination of the cannula by storing the infusion tube inside the cannula in normal conditions. Rotating the worm drives the worm wheel, which in turn drives the cam to rotate, thereby pushing the infusion tube out of the cannula, making it convenient to use.

[0017] 2. The femoral artery cannula for providing blood perfusion to the lower limbs is provided with a blocking plate by abutting the outer wall of the through groove, that is, it can block and protect the inside of the cannula under normal conditions, and can effectively prevent foreign matter from entering the cannula.

[0018] The parts not involved in the device are the same as those in the prior art or can be implemented using the prior art. The present invention can store the injection tube in the cannula and take it out when in use, thereby preventing the injection tube from being contaminated as much as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] FIG1 is a schematic structural diagram of a femoral artery cannula for providing blood perfusion to the lower limbs proposed by the present invention;

[0020] FIG2 is a schematic diagram of the overall structure of FIG1 ;

[0021] FIG3 is an enlarged schematic diagram of the structure of a local portion A in FIG1 ;

[0022] FIG4 is an enlarged schematic diagram of the structure of a local portion B in FIG2 .

[0023] In the figure: 1 outer tube, 2 inner tube, 3 through hole, 4 sliding rod, 5 slide plate, 6 liquid injection tube, 7 rotating rod, 8 cam, 9 worm gear, 10 side plate, 11 worm, 12 rotating wheel, 13 spring, 14 stopper, 15 sealing plate, 16 connecting strip, 17 clamping block. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0025] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0026] 1-4 , a femoral artery cannula for providing blood perfusion to the lower limbs comprises an outer tube 1 and an inner tube 2. The inner tube 2 is fixedly sleeved on the inside of the outer tube 1. A plurality of through holes 3 are provided on the lower surface of the outer tube 1. Through grooves are provided on the outer upper surfaces of the outer tube 1 and the inner tube 2. Slide rods 4 are fixedly provided at both ends of the lower sides of the two through grooves. A slide plate 5 is movably adjusted between the two slide rods 4. An injection tube 6 is fixedly sleeved on the inside of the slide plates 5. A transmission mechanism for pushing the injection tube 6 to move is provided on the lower side of the two slide plates 5. A blocking mechanism is provided on the outer side of the through grooves.

[0027] The transmission mechanism includes a rotating rod 7 and a cam 8. The rotating rod 7 is arranged on the lower side of the slide 5. Both ends of the rotating rod 7 are rotatably connected to the side walls of the corresponding outer tube 1 and inner tube 2 through sealed bearings. The cam 8 is fixedly sleeved on the outer wall of the rotating rod 7. The cam 8 conflicts with the lower surface of the slide 5. One end of the two rotating rods 7 extends to the outside of the corresponding outer tube 1 and inner tube 2 and is fixedly sleeved with a worm gear 9. A worm 11 is meshed with one side of the worm gear 9. Both ends of the worm 11 are rotatably connected to side plates 10. Multiple side plates 10 are fixedly connected to the outer walls of the corresponding outer tube 1 and inner tube 2, respectively.

[0028] The blocking mechanism includes a blocking plate 15 and a blocking block 17. The blocking plates 15 are arranged to abut against each other on the outside of the through groove. One end of the two blocking plates 15 is fixedly connected to the outer wall of the corresponding outer tube 1 and inner tube 2 through a connecting strip 16. The blocking block 17 is fixedly arranged on the end of the corresponding blocking plate 15 away from the connecting strip 16. The outer wall of the outer tube 1 and the inner tube 2 on the side close to the blocking block 17 is provided with a blocking groove, and the blocking block 17 is engaged with the corresponding blocking groove.

[0029] The rod walls of multiple slide rods 4 are movably sleeved with springs 13, and the two ends of multiple springs 13 are fixedly connected to the outer walls of the corresponding slide plates 5, outer tube 1 and inner tube 2, respectively, so that the slide plates 5 can drive the injection tube 6 to reset and retract it into the cannula.

[0030] The lower ends of the plurality of slide bars 4 are all fixedly provided with stoppers 14 to prevent the slide plates 5 from slipping off the rod walls of the slide bars 4 as much as possible.

[0031] One end of each of the two worms 11 is fixedly sleeved with a rotating wheel 12 to facilitate the rotation of the worms 11 .

[0032] The blocking plate 15, the connecting strip 16 and the clamping block 17 are all made of antibacterial silicone material, which is easy to open and has good antibacterial properties.

[0033] In the present invention, when in use, since the injection tube 6 is normally stored in the cannula, it is possible to prevent the injection tube from being contaminated. The outer wall of the through groove is provided with a blocking plate 15, that is, the inside of the cannula can be blocked and protected in normal state, which can effectively prevent foreign matter from entering the cannula. When connection is required, the worm 11 is rotated to drive the worm wheel 9 to rotate, that is, the rotating rod 7 can drive the cam 8 to rotate, that is, the injection tube 6 can be pushed out of the cannula, that is, the connection is convenient. After being connected to the external blood transfusion tube, the inner tube 2 transfuses blood to the proximal femoral artery, and the through hole on the side wall of the outer tube 1 transfuses blood to the distal femoral artery, that is, blood is injected into the lower limbs to prevent lower limb ischemia.

[0034] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A femoral artery cannula for providing blood perfusion to the lower limbs, comprising an outer tube (1) and an inner tube (2), characterized in that: The inner tube (2) is fixedly sleeved on the inside of the outer tube (1); a plurality of through holes (3) are provided on the lower surface of the outer tube (1); through grooves are provided on the outer upper surfaces of the outer tube (1) and the inner tube (2); sliding rods (4) are fixedly provided at both ends of the lower sides of the two through grooves; a slide plate (5) is movably adjusted between the two sliding rods (4); an injection tube (6) is fixedly sleeved on the inside of the slide plate (5); a transmission mechanism for pushing the injection tube (6) to move is provided on the lower sides of the two slide plates (5); and a blocking mechanism is provided on the outer side of the through groove.

2. A femoral artery cannula for providing lower limb blood perfusion according to claim 1, characterized in that: The transmission mechanism comprises a rotating rod (7) and a cam (8). The rotating rod (7) is arranged on the lower side of the slide (5). Both ends of the rotating rod (7) are rotatably connected to the side walls of the corresponding outer tube (1) and inner tube (2) through sealed bearings. The cam (8) is fixedly sleeved on the outer wall of the rotating rod (7). The cam (8) contacts the lower surface of the slide (5). One end of the two rotating rods (7) respectively extends to the outer side of the corresponding outer tube (1) and inner tube (2) and is fixedly sleeved with a worm gear (9). A worm (11) is meshed with one side of the worm gear (9). Both ends of the worm gear (11) are rotatably connected to side plates (10). A plurality of side plates (10) are fixedly connected to the outer walls of the corresponding outer tube (1) and inner tube (2).

3. A femoral artery cannula for providing lower limb blood perfusion according to claim 1, characterized in that: The blocking mechanism comprises a blocking plate (15) and a clamping block (17). The blocking plates (15) are arranged to abut against each other on the outside of the through groove. One end of the two blocking plates (15) is fixedly connected to the outer wall of the corresponding outer tube (1) and the inner tube (2) through a connecting strip (16). The clamping block (17) is fixedly arranged on the end of the corresponding blocking plate (15) away from the connecting strip (16). The outer wall of the outer tube (1) and the inner tube (2) on one side close to the clamping block (17) is provided with a clamping groove, and the clamping block (17) is clamped with the corresponding clamping groove.

4. A femoral artery cannula for providing lower limb blood perfusion according to claim 1, characterized in that: The rod walls of the plurality of slide rods (4) are all movably sleeved with springs (13), and the two ends of the plurality of springs (13) are respectively fixedly connected to the outer walls of the corresponding slide plates (5), outer tubes (1) and inner tubes (2).

5. The femoral artery cannula for providing lower limb blood perfusion according to claim 1, characterized in that: A stopper (14) is fixedly provided at the lower ends of the plurality of slide bars (4).

6. A femoral artery cannula for providing lower limb blood perfusion according to claim 2, characterized in that: One end of each of the two worms (11) is fixedly sleeved with a rotating wheel (12).

7. The femoral artery cannula for providing lower limb blood perfusion according to claim 3, characterized in that: The blocking plate (15), the connecting strip (16) and the clamping block (17) are all made of antibacterial silica gel material.