An auxiliary device for heart surgery cardiovascular surgery cannulation

Abstract

This invention discloses an auxiliary device for catheterization in cardiovascular surgery, belonging to the field of medical device technology. It includes a housing with a through-hole for catheter passage and a cavity within the housing. Two rotating wheels are rotatably mounted within the cavity, clamping the catheter and moving it along the through-hole via counter-rotation. Gears are fixedly mounted on one side of each wheel, meshing with each other. One of the gears, the end furthest from the rotating wheel, is fixedly connected to a connecting shaft. A radial groove is formed within the connecting shaft, and a ratchet rack is slidably connected within the groove. A spring is fixedly connected between the ratchet rack and the bottom wall of the groove. A knob is rotatably connected to the outer wall of the housing, and a ratchet ring is fixedly mounted on the knob to engage with the ratchet rack. This invention limits the rotation speed applied by medical personnel to the knob, preventing excessive force that could cause the catheter to move too quickly, thus ensuring smooth catheter advancement.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, specifically relating to an auxiliary device for cannulation in cardiovascular surgery. Background Technology

[0002] In order to respond promptly to cardiovascular diseases, patients need to undergo intubation treatment in a timely manner to achieve the goal of timely treatment and avoid life-threatening situations. During intubation, imaging guidance is used to guide the endotracheal tube into the trachea, providing visual indicators for blind endotracheal intubation. This can effectively improve the success rate of intubation, which is conducive to the patient's recovery, reduces the burden on patients and their families, and allows patients to treat the disease faster and more comfortably, thus overcoming the disease and returning to health. Intubation treatment is often carried out with the help of intubation devices.

[0003] Existing technologies, such as Chinese Patent Publication No. CN113350661B, disclose an image-assisted cardiovascular surgical cannulation device. This device uses a constant-speed pushing mechanism to propel the catheter within the cannula seat into the patient's body at a uniform speed for cannulation. However, medical personnel rely entirely on visual observation to monitor the catheter's movement within the patient, lacking tactile feedback regarding the resistance at the catheter tip.

[0004] Therefore, there is a need to develop an auxiliary device for cannulation in cardiac surgery to solve the above problems. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide an auxiliary device for catheterization in cardiovascular surgery, which solves the problem of lack of tactile feedback on the resistance of the catheter tip in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: This invention discloses an auxiliary device for catheterization in cardiovascular surgery, comprising a housing with a through hole for catheter passage and a cavity. Two rotating wheels are rotatably mounted within the cavity, clamping the catheter and moving it along the through hole via opposite rotation. Gears are fixedly mounted on one side of each rotating wheel, meshing with each other. A connecting shaft is fixedly connected to the end of one of the gears furthest from the rotating wheel. A radial groove is provided within the connecting shaft, and a ratchet rack is slidably connected within the groove. A spring is fixedly connected between the ratchet rack and the bottom wall of the groove. A knob is rotatably connected to the outer wall of the housing, and a ratchet ring capable of meshing with the ratchet rack is fixedly mounted on the knob.

[0007] Furthermore, rotating the knob clockwise can drive the connecting shaft to rotate via the ratchet rack, which in turn drives two rotating wheels via two gears to move the catheter into the blood vessel. The threshold of the propulsion resistance is when the ratchet rack and its ring are at the engagement point along the propulsion direction. When the propulsion resistance is within the threshold, rotating the ratchet ring clockwise can drive the connecting shaft to rotate clockwise via the ratchet rack. When the propulsion resistance exceeds the threshold, rotating the ratchet ring clockwise can cause the ratchet rack to slide into the groove, thus disengaging the ratchet rack from the ratchet ring.

[0008] Furthermore, rotating the knob counterclockwise can drive the connecting shaft to rotate via the ratchet rack, which in turn drives two wheels to rotate via two gears, thus moving the catheter out of the blood vessel. The point at which the ratchet rack and ratchet ring are engaged in the retraction direction is the retraction resistance threshold. When the retraction resistance is within the retraction resistance threshold, rotating the ratchet ring counterclockwise can drive the connecting shaft to rotate counterclockwise via the ratchet rack. When the retraction resistance exceeds the retraction resistance threshold, rotating the ratchet ring counterclockwise can cause the ratchet rack to slide into the groove, thus disengaging the ratchet rack from the ratchet ring.

[0009] Furthermore, the ratchet ring has multiple ratchet teeth arranged circumferentially around the connecting shaft, and each ratchet tooth has a first inclined edge and a second inclined edge. The ratchet rack has a third inclined edge and a fourth inclined edge. The first and third inclined edges have the same inclination angle, and the second and fourth inclined edges have the same inclination angle. When the knob is rotated clockwise to make the first and third inclined edges disengage at the critical point, the pushing resistance threshold is reached. When the knob is rotated counterclockwise to make the second and fourth inclined edges disengage at the critical point, the retraction threshold is reached.

[0010] Furthermore, the tilt angle of the first inclined edge along the vertical direction is smaller than the tilt angle of the second inclined edge along the vertical direction, so that the propulsion resistance threshold is greater than the retraction resistance threshold.

[0011] Furthermore, a trapezoidal block is slidably connected within the groove, with the inclined side of the trapezoidal block positioned away from the ratchet rack. The spring is fixedly connected between the trapezoidal block and the ratchet rack. A sliding hole is axially provided within the connecting shaft, and a push rod is slidably connected within the sliding hole. Sliding the push rod can compress the inclined side of the trapezoidal block, causing the trapezoidal block to slide along the groove.

[0012] Furthermore, the connecting shaft is axially provided with a threaded hole that communicates with the sliding hole, and a screw is threadedly connected to the threaded hole. The screw extends into the sliding hole and is rotatably connected to the push rod.

[0013] The beneficial effects of this invention are as follows: When the propulsion resistance exceeds the propulsion resistance threshold, this invention allows the ratchet ring to slide into the groove by rotating it clockwise, thus disengaging the ratchet ring and providing feedback on the slippage. The compression of the spring also produces a noticeable tactile feedback, providing doctors with an intuitive tactile warning. Furthermore, it can limit the rotation speed applied by medical staff to the knob, preventing excessive rotation force from causing the catheter to move too quickly, thereby ensuring the smooth advancement of the catheter. Attached Figure Description

[0014] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the following figures are provided for illustration: Figure 1 This is a cross-sectional view of the overall structure of an embodiment of the present invention; Figure 2 This is a top sectional view of the ratchet rack and ratchet ring assembly structure according to an embodiment of the present invention; Figure 3 This is a side cross-sectional view of the ratchet rack and ratchet ring mating structure according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the overall structure of an embodiment of the present invention.

[0015] The following are the markings in the attached diagram: housing 1, through hole 101, cavity 102, conduit 2, rotating wheel 3, gear 4, connecting shaft 5, sliding groove 501, ratchet rack 502, third inclined edge 5021, fourth inclined edge 5022, spring 503, trapezoidal block 504, sliding hole 505, push rod 506, threaded hole 507, screw 508, knob 6, ratchet ring 601, ratchet 602, first inclined edge 6021, second inclined edge 6022. Detailed Implementation

[0016] like Figures 1-4 As shown, this invention discloses an auxiliary device for catheterization in cardiovascular surgery, comprising: a housing 1, wherein a through hole 101 for a catheter 2 to pass through is provided inside the housing 1, and a cavity 102 is provided inside the housing 1. Two rotating wheels 3 are rotatably installed in the cavity 102. The two rotating wheels 3 are used to clamp the catheter 2 and drive the catheter 2 to move along the through hole 101 by rotating in opposite directions. A gear 4 is fixedly installed on one side of the rotating wheel 3. The two gears 4 are meshed. A connecting shaft 5 is fixedly connected to the end of one of the two gears 4 away from the rotating wheel 3. A sliding groove 501 is radially provided inside the connecting shaft 5. A ratchet rack 502 is slidably connected in the sliding groove 501. A spring 503 is fixedly connected between the ratchet rack 502 and the bottom wall of the sliding groove 501. A knob 6 is rotatably connected to the outer wall of the housing 1. A ratchet ring 601 that can mesh with the ratchet rack 502 is fixedly provided on the knob 6.

[0017] In this design, rotating the knob 6 clockwise rotates the connecting shaft 5 via the ratchet 502, which in turn rotates the two wheels 3 via the two gears 4, thus moving the catheter 2 into the blood vessel. The threshold of the propulsion resistance is reached when the ratchet 502 and the ratchet ring 601 are at the critical point of engagement along the propulsion direction. When the propulsion resistance is within the threshold, rotating the ratchet ring 601 clockwise rotates the connecting shaft 5 clockwise via the ratchet 502. When the propulsion resistance exceeds the threshold, rotating the ratchet ring 601 clockwise causes the ratchet 502 to slide into the groove 501, disengaging it from the ratchet ring 601 and providing a feedback of slippage. The compression of the spring 503 produces a noticeable tactile feedback, providing a direct tactile warning to the doctor. This also limits the rotation speed applied to the knob 6 by medical personnel, preventing excessive rotation force from causing the catheter 2 to move too quickly, thus ensuring the smooth propulsion of the catheter 2.

[0018] In one embodiment of the invention, rotating the knob 6 counterclockwise causes the connecting shaft 5 to rotate via the ratchet 502, which in turn drives the two wheels 3 to rotate via the two gears 4, thus moving the catheter 2 out of the blood vessel. The retraction resistance threshold is defined as the point at which the ratchet 502 and the ratchet ring 601 are engaged in the retraction direction. When the retraction resistance is within this threshold, rotating the ratchet ring 601 counterclockwise causes the connecting shaft 5 to rotate counterclockwise via the ratchet 502. When the retraction resistance exceeds the threshold, rotating the ratchet ring 601 counterclockwise causes the ratchet 502 to slide into the groove 501, disengaging the ratchet 502 from the ratchet ring 601. This ensures a smooth retraction of the catheter 2.

[0019] In one embodiment of the present invention, a plurality of ratchet teeth 602 are circumferentially arranged on the ratchet ring 601 with the connecting shaft 5 as the center. The ratchet teeth 602 are provided with a first inclined edge 6021 and a second inclined edge 6022. The ratchet rack 502 is provided with a third inclined edge 5021 and a fourth inclined edge 5022. The first inclined edge 6021 and the third inclined edge 5021 have the same inclination angle, and the second inclined edge 6022 and the fourth inclined edge 5022 have the same inclination angle. When the knob 6 is rotated clockwise to make the first inclined edge 6021 and the third inclined edge 5021 disengage at the critical point, the push resistance threshold is reached. When the knob 6 is rotated counterclockwise to make the second inclined edge 6022 and the fourth inclined edge 5022 disengage at the critical point, the pullback resistance threshold is reached. The inclination angle of the first inclined edge 6021 in the vertical direction is smaller than the inclination angle of the second inclined edge 6022 in the vertical direction, so that the push resistance threshold is greater than the pullback resistance threshold.

[0020] In this design, since the blood flow direction is opposite to the advancement direction during cardiovascular cannulation, the catheter must also overcome the blood flow resistance during advancement. Through the above structural design, it is possible to avoid the catheter 2 retraction rate being too fast under the same resistance, which would cause impact on the inner wall of the blood vessel.

[0021] In one embodiment of the present invention, a trapezoidal block 504 is slidably connected in the groove 501, the inclined side of the trapezoidal block 504 is disposed away from the ratchet rack 502, and the spring 503 is fixedly connected between the trapezoidal block 504 and the ratchet rack 502; a sliding hole 505 is axially provided in the connecting shaft 5, and a push rod 506 is slidably connected in the sliding hole 505. Sliding the push rod 506 can compress the inclined side of the trapezoidal block 504 to make the trapezoidal block 504 slide along the groove 501.

[0022] In this scheme, since the ratchet ring 601 needs to overcome the elastic force of the spring 503 during the advancement of the conduit 2, this scheme can squeeze the trapezoidal block 504 through the slide rod push rod 506, thereby changing the degree of compression of the spring 503, and thus adjusting the thrust resistance threshold and the retraction resistance threshold.

[0023] In one embodiment of the present invention, the connecting shaft 5 is axially provided with a threaded hole 507 communicating with the sliding hole 505, and a screw 508 is threadedly connected in the threaded hole 507. The screw 508 extends into the sliding hole 505 and is rotatably connected to the push rod 506.

[0024] This solution enables the push rod 506 to move axially along the sliding hole 505 by rotating the screw 508, and ensures the stability of the push rod 506 when it moves to the preset position.

[0025] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. An auxiliary device for cannulation in cardiovascular surgery, comprising a housing, characterized in that, The housing has a through hole for the conduit to pass through. The housing also has a cavity containing two rotating wheels rotatably mounted. These wheels clamp the conduit and move it along the through hole by rotating in opposite directions. A gear is fixedly mounted on one side of each wheel, and the two gears mesh. One of the gears, away from the wheel, is fixedly connected to a connecting shaft. A radial groove is provided inside the connecting shaft, and a ratchet rack is slidably connected within the groove. A spring is fixedly connected between the ratchet rack and the bottom wall of the groove. A knob is rotatably connected to the outer wall of the housing, and a ratchet ring that meshes with the ratchet rack is fixedly mounted on the knob.

2. The auxiliary device for cannulation in cardiovascular surgery according to claim 1, characterized in that: Turning the knob clockwise rotates the connecting shaft via the ratchet rack, which in turn drives two wheels via two gears to move the catheter into the blood vessel. The threshold of the propulsion resistance is when the ratchet rack and its ring are at the engagement point along the propulsion direction. When the propulsion resistance is within the threshold, turning the ratchet ring clockwise rotates the connecting shaft clockwise via the ratchet rack. When the propulsion resistance exceeds the threshold, turning the ratchet ring clockwise slides the ratchet rack into the groove, disengaging the ratchet rack from the ratchet ring.

3. The auxiliary device for cannulation in cardiovascular surgery according to claim 2, characterized in that: Turning the knob counterclockwise drives the connecting shaft to rotate via the ratchet rack, which in turn drives two wheels via two gears to move the catheter out of the blood vessel. The point at which the ratchet rack and ratchet ring are engaged in the retraction direction is the retraction resistance threshold. When the retraction resistance is within the retraction resistance threshold, turning the ratchet ring counterclockwise drives the connecting shaft to rotate counterclockwise via the ratchet rack. When the retraction resistance exceeds the retraction resistance threshold, turning the ratchet ring counterclockwise causes the ratchet rack to slide into the groove, thus disengaging the ratchet rack from the ratchet ring.

4. The auxiliary device for cannulation in cardiovascular surgery according to claim 3, characterized in that: The ratchet ring has multiple ratchet teeth arranged circumferentially around the connecting shaft. Each ratchet tooth has a first inclined edge and a second inclined edge. The ratchet rack has a third inclined edge and a fourth inclined edge. The first and third inclined edges have the same inclination angle, and the second and fourth inclined edges have the same inclination angle. When the knob is rotated clockwise to make the first and third inclined edges disengage at the critical point, the propulsion resistance threshold is reached. When the knob is rotated counterclockwise to make the second and fourth inclined edges disengage at the critical point, the retraction threshold is reached.

5. The auxiliary device for cannulation in cardiovascular surgery according to claim 4, characterized in that: The tilt angle of the first inclined edge along the vertical direction is smaller than the tilt angle of the second inclined edge along the vertical direction, so that the propulsion resistance threshold is greater than the retraction resistance threshold.

6. The auxiliary device for cannulation in cardiovascular surgery according to claim 5, characterized in that: A trapezoidal block is slidably connected within the groove, with its inclined side positioned away from the ratchet rack. A spring is fixedly connected between the trapezoidal block and the ratchet rack. A sliding hole is axially provided within the connecting shaft, and a push rod is slidably connected within the sliding hole. Sliding the push rod can compress the inclined side of the trapezoidal block, causing the trapezoidal block to slide along the groove.

7. The auxiliary device for cannulation in cardiovascular surgery according to claim 6, characterized in that: The connecting shaft has an axially arranged threaded hole that communicates with the sliding hole. A screw is threadedly connected to the threaded hole, and the screw extends into the sliding hole and is rotatably connected to the push rod.

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