CN219397386U - Suction catheter - Google Patents

Abstract

The utility model provides a suction catheter comprising an outer tube; the first suction pipe is arranged in the outer pipe, can move along the extending direction of the outer pipe and extends out of the outer pipe; the ligature rope is arranged in the outer tube and is used for bundling human tissues adsorbed by the suction catheter; the first suction pipe comprises a first adsorption head, the first adsorption head comprises a support framework, at least one part of the support framework is made of memory alloy, a sealing film is arranged on the peripheral surface of the support framework, and the first adsorption head is arranged in the outer pipe in a gathering state; the first suction pipe stretches out of the outer pipe and can be changed into an unfolding state, and the first suction head in the unfolding state is in a horn shape; the second suction pipe is arranged in the first suction pipe and can move along the extending direction of the first suction pipe. In the utility model, the extending end part of the second suction tube directly adsorbs and pulls the left auricle, and the position of the second suction head for adsorbing the left auricle can be selected according to the operation requirement.

Description

Suction catheter

Technical Field

The utility model relates to the technical field of medical instruments, in particular to a suction catheter.

Background

One type of suction catheter currently available includes an outer tube, a suction tube, and a support frame bundle. The suction pipe is movably arranged in the outer pipe, an adsorption head is arranged at one extending end of the suction pipe, and a supporting frame is arranged at one extending side of the adsorption head. The left auricle of the heart can be plugged by using the suction catheter; after the support frame is delivered to the corresponding position of the left auricle, the absorption head of the suction pipe is aligned with the inner cavity of the left auricle, the support frame and the absorption head are sequentially arranged, the suction pipe is communicated with negative pressure to absorb the inner wall tissue of the left auricle to the direction of the absorption head, the left auricle moves in the support frame to the direction of the absorption head, and the left auricle is bound by the binding piece after being supported and shaped by the support frame, so that the left auricle is blocked.

When the left auricle is adsorbed by the existing suction catheter, a supporting frame is arranged between the adsorption head and the left auricle, the adsorption head is not in direct contact with the left auricle, and the motion track of the left auricle is uncontrollable in the process of adsorbing the left auricle by the adsorption head, so that the left auricle cannot be accurately kept at the optimal operation position when the left auricle is bound by using the binding piece.

Disclosure of Invention

The utility model aims to provide a suction catheter capable of controlling the movement track of the left auricle during operation.

The utility model provides a suction catheter comprising: an outer tube; the first suction pipe is arranged in the outer pipe, can move along the extending direction of the outer pipe and extends out of the outer pipe; the ligature rope is arranged in the outer tube and is used for bundling human tissues adsorbed by the suction catheter; the aspiration catheter further comprises: the first suction pipe comprises a first adsorption head, the first adsorption head comprises a support framework, at least one part of the support framework is made of memory alloy, a sealing film is arranged on the peripheral surface of the support framework, and the first adsorption head is arranged in the outer pipe in a gathering state; the first suction pipe stretches out of the outer pipe and can be changed into an unfolding state, and the first suction head in the unfolding state is in a horn shape; the second suction pipe is arranged in the first suction pipe and can move along the extending direction of the first suction pipe.

As can be seen from the above solution, the second suction tube can extend from the first suction tube, the extending end of the second suction tube directly contacts the left auricle, the second suction tube adsorbs and pulls the left auricle into the first adsorption head in the first suction tube to enable the first adsorption head to adsorb the left auricle, and the second suction tube directly contacts the left auricle, so that the position of the second suction head adsorbing the left auricle can be adaptively selected according to the operation requirement; the horn-shaped first adsorption head can have better plasticity on the left auricle, and is convenient for the ligation rope to bind the left auricle; the first adsorption head consists of a supporting framework and a sealing film, the adsorption head is in surface-to-surface contact with left auricle tissues, and the adsorption head has small stimulation to the left auricle.

According to the scheme, the supporting framework is of a net structure.

Therefore, the supporting framework of the net structure is more uniformly stressed, and the supporting structure is more stable.

According to the above aspect, the sealing film is attached to the inner periphery of the support frame.

Therefore, the sealing film is arranged on the inner periphery of the supporting framework, when the first adsorption head adsorbs the left auricle, the sealing film made of the high polymer film is positioned between the supporting framework and the left auricle tissue, and the direct contact of the sealing film and the left auricle tissue is smaller than the direct contact of the supporting framework and the left auricle tissue to the stimulation of the left auricle.

According to the above aspect, the aspiration catheter further comprises an inner tube, a connection block, and a delivery member; the inner tube is arranged between the outer tube and the first suction tube; the ligature rope surrounds the periphery of the inner tube, and a connecting block is arranged on the ligature rope; the connecting block is provided with a top groove sunken in the surface of the connecting block; the delivery piece is arranged between the outer tube and the inner tube, one extending end of the delivery piece is positioned in the top groove, and the delivery piece can push the connecting block along the first direction.

Therefore, an independent delivery space is formed between the inner catheter and the outer catheter, the delivery piece moves in the independent delivery space and is not easy to scrape, and the delivery effect is better. The arrangement of the top groove enables the delivery piece and the connecting block to form stable fit.

According to the above aspect, at least a part of the delivery member is made of a memory alloy, the delivery member includes a first straight section and a first curved section which are sequentially arranged along a first direction, and a distance from the first curved section to a center of the inner tube along the first direction becomes gradually larger; when the delivery member is positioned within the outer tube, the delivery member is peripherally constrained by the outer tube.

It follows that the delivery member is made of a memory alloy and that when the first curved section extends out of the outer tube, the first curved section is capable of supporting the ligature rope in a loop having a predetermined inner diameter such that the ligature rope is capable of encircling the outer circumference of the left atrial appendage tissue.

According to the scheme, the suction catheter further comprises a traction piece made of memory alloy, the traction piece is arranged between the outer tube and the inner tube, the traction piece comprises a second straight-line section and a second bending section which are sequentially arranged along the first direction, and the extension end part of the second bending section comprises a back hook; the connecting block is also provided with a back hook groove sunken in the surface of the connecting block, and the back hook groove and the top groove are respectively positioned on two opposite sides of the connecting block; the extension end of the return hook is positioned in the return hook groove, and the pulling piece can apply pulling force in a second direction to the connecting block, wherein the second direction is opposite to the first direction.

Therefore, the traction piece and the delivery piece are matched to form opposite force to clamp the connecting block, so that the movement of the ligature rope is more stable and controllable; the arrangement of the back hook groove and the back hook enables the connection relation between the traction piece and the connecting piece to be more stable.

According to the technical scheme, the suction catheter further comprises a limiting ring, the limiting ring is fixedly connected with the delivery piece, the traction piece penetrates through the through hole of the limiting ring, and the limiting ring limits the displacement of the traction piece relative to the delivery piece in the inner radial direction.

Therefore, the limiting ring can limit the displacement of the traction piece in the radial direction of the inner guide pipe, so that the position between the delivery piece and the traction piece is relatively fixed to form a stable matching relationship.

According to the scheme, the suction catheter further comprises a ligation block, wherein the ligation block is provided with a first through hole, and the inner wall of the first through hole is provided with a first limiting part; the ligature rope comprises a second limiting part, one extending end of the ligature rope is fixedly connected with the ligature block, the other extending end of the ligature rope penetrates through the first through hole along the third direction, an annular rope part is formed on one extending side of the ligature rope, and the first limiting part blocks the second limiting part in the fourth direction; the third direction is opposite to the fourth direction.

Therefore, the compactness of the left auricle bound by the ligature rope can be adjusted by moving the ligature rope in the first through hole along the third direction, after the ligature rope finishes binding the left auricle, the binding stability of the ligature rope can be ensured by matching the second limiting part with the first limiting part, and the ligature rope is prevented from being bound loosely.

According to the above aspect, further, the outer diameter of the second stopper portion gradually increases in the fourth direction.

Therefore, along the fourth direction, the outer diameter of the second limiting part is gradually increased, so that the second limiting part can more easily pass through the first through hole, and meanwhile, the second limiting part and the first limiting part can form stable limiting fit.

According to the scheme, the second suction pipe further comprises a suction head which is funnel-shaped, and the suction head is positioned at one extending end of the second suction pipe.

Therefore, a larger adsorption area is formed between the funnel-shaped suction head and the left auricle tissue, so that the suction is more stable, and the stimulation to the left auricle tissue is smaller.

Drawings

Fig. 1 is a partial cross-sectional view of a first state of an embodiment of a suction catheter of the present utility model.

Figure 2 is a partial cross-sectional view of a second state of an embodiment of the aspiration catheter of the present utility model.

Figure 3 is a block diagram of a third state of an embodiment of the aspiration catheter of the present utility model.

Fig. 4 is a block diagram of a ligature rope of an embodiment of a aspiration catheter of the present utility model.

Figure 5 is a cross-sectional view of a connection block of an aspiration catheter embodiment of the present utility model.

Figure 6 is a block diagram of the support framework of an embodiment of the aspiration catheter of the present utility model.

Fig. 7 is a partial schematic view of an embodiment of a suction catheter of the present utility model.

Fig. 8 is a cross-sectional view of a ligation block of an embodiment of a suction catheter according to the utility model.

Fig. 9 is a schematic view of an aspiration catheter embodiment of the present utility model in a first use condition.

Fig. 10 is a schematic view of an aspiration catheter embodiment of the present utility model in a second use condition.

Fig. 11 is an enlarged view at a in fig. 10.

The utility model is further described below with reference to the drawings and examples.

Detailed Description

Referring to fig. 1 to 3, the suction catheter of the present embodiment includes an outer tube 1, an inner tube 2, a first suction tube 3, a second suction tube 4, a pulling member 5, a delivery member 6, a connection block 7, a ligature 8, a stop collar 9, scissors 10, and a ligation block 11. The end of the suction catheter extending into the human body is a far end, and the end of the suction catheter positioned outside the human body is a near end. The first direction is a direction from the distal end to the proximal end, and the second direction is a direction opposite to the first direction.

The outer tube 1, the inner tube 2, the first suction tube 3 and the second suction tube 4 are disposed in this order in the radial direction of the outer tube 1 and toward the center direction of the outer tube 1.

Referring to fig. 1, 3 and 6, the first suction tube 3 includes a mesh-shaped supporting frame 31 made of a memory alloy, and a sealing film (not shown) made of a high molecular polymer is adhered to an inner circumference of the supporting frame 31 by an adhesive, and a first suction passage 32 is formed inside the first suction tube 3. The first suction pipe 3 includes a first suction pipe section 33 and a first suction head 34 which are sequentially arranged in the first direction, and the first suction head 34 is horn-shaped in the unfolded state. Referring to fig. 1, the first suction tube 3 is located in the inner tube 2, and the first suction head 34 is limited by the inner tube and gathered inside the inner tube 2; referring to fig. 2 and 3 again, the first suction head 34 extends out of the inner tube 2 along the first direction, the first suction head 34 is not limited by the inner tube 2, and the first suction head 34 is restored to the expanded state from the gathered state due to the characteristics of the memory alloy.

Referring to fig. 1, the second suction pipe 4 includes a second suction pipe section 41 and a funnel-shaped second suction head 42 disposed in this order in the first direction, and the second suction pipe 4 is movable in the first and second directions within the first suction pipe 3.

Referring to fig. 3 and 8, the ligation block 11 has a square shape, and the ligation block 11 includes first and second opposite surfaces 1101 and 1102 and a third surface 1103 connected between the first and second surfaces 1101 and 1102. The ligature rope 8 comprises a first rope end and a second rope end which are opposite, wherein the first rope end is fixedly connected to the first surface 1101; the ligation block 11 is provided with a first through hole 111 therein, and two openings of the first through hole 111 are located on the second surface 1102 and the third surface 1103, respectively. The second rope head penetrates into the first through hole 111 from the opening on the second surface 1102 and penetrates out from the opening on the third surface 1103; the ligating block 11 includes a first limiting portion 112, and the first limiting portion 112 is a ratchet protruding from an inner wall surface of the first through hole 111.

Referring to fig. 4 and 8, along the length direction of the ligature rope 8, the ligature rope 8 includes a plurality of second limiting portions 82 sequentially provided at the outer periphery thereof, the second limiting portions 82 are annular protrusions protruding from the outer periphery of the ligature rope 8, the outer diameters of the annular protrusions become gradually larger along the third direction, and the first limiting portions 112 block the second limiting portions 82 in the fourth direction. The third direction is the direction from the second rope end to the first rope end, and the fourth direction is the direction from the first rope end to the second rope end. After passing through the first through hole 111, the ligature rope 8 forms a ring-shaped rope portion 81 on the extending side of the ligature rope 8, the ring-shaped rope portion 81 surrounds the periphery of the inner tube 2, and the second rope head is positioned on the proximal end side of the suction catheter.

Referring to fig. 5, the connection block 7 is in a square shape, and along a circumferential direction of the connection block 7, the connection block 7 includes a third surface 701, a fourth surface, a fifth surface 702, and a sixth surface which are sequentially connected, the third surface 701 being opposite to the fifth surface 702, and the fourth surface being opposite to the sixth surface. The third surface 701 is concave with a top groove 71, and the top groove 71 is a spherical crown-shaped groove; the fifth surface 702 is concave with a back hook groove 72, and the back hook groove 72 is a columnar groove; the connection block 7 further includes a second through hole 73, and the second through hole 73 penetrates through the fourth surface and the sixth surface. Referring again to fig. 3, four connection blocks 7 are uniformly provided on the annular string portion 81, the ligature string 8 penetrates through the second through hole 73 of the connection block 7, the top groove 71 faces the proximal end of the suction catheter, and the back hooking groove 72 faces the distal end of the suction catheter. The ligature rope 8 is made of titanium alloy and has a memory function; referring again to fig. 7, when the annular rope portion 81 is positioned in the outer pipe 1, the annular rope portion 81 deforms and gathers in the outer pipe 1; referring again to fig. 3, when the annular string portion 81 is extended from the inside of the outer catheter tube 1, the annular string portion 81 is unfolded and restored to the circular shape.

Referring to fig. 1 to 3 and 5, the delivery member 6 is a long rod made of nitinol; the delivery piece 6 is located between the outer tube 1 and the inner tube 2, the delivery piece 6 comprises a first straight line segment 61 and a first bending segment 62 which are sequentially arranged, the distance between the first bending segment 62 and the center of the inner tube 2 along the first direction gradually increases, the extending end part of the first bending segment 62 is located in the top groove 71, and when the delivery piece 6 is located in the outer tube 1, the delivery piece 6 is limited by the outer tube 1 from the periphery; the pulling member 5 is made of nickel-titanium memory alloy, the pulling member 5 is located between the outer tube 1 and the inner tube 2, the pulling member 5 comprises a second straight line section 51 and a second bending section 52 which are sequentially arranged, the distance between the second bending section 52 and the center of the inner tube 2 along the first direction is gradually increased, the extending end of the second bending section 52 comprises a U-shaped return hook 521, the hook head of the return hook 521 faces the proximal end of the suction catheter, the hook head of the return hook 521 is located in the return hook groove 72, and when the pulling member 5 is located in the outer tube 1, the pulling member 5 is limited by the outer tube 1 from the periphery. The limiting ring 9 is fixedly connected with the delivery piece 6, and the traction piece 5 passes through the limiting ring 9; in the radial direction of the inner tube 2, the limiting ring 9 limits the movement of the pulling member 5 relative to the delivery member 6, and the limiting ring 9 limits the distance between the pulling member 5 and the delivery member 6. The looped-cord portion 81 of the ligature 8 may be delivered forward in a first direction using the delivery member 6; when the delivery member 6 moves along the first direction, the delivery member 6 can drive the connection block 7 to move along the first direction, and at the moment, the pulling member 5 is pulled along the second direction, the delivery member 6 and the pulling member 5 apply forces in two opposite directions to the connection block 7, so that opposite forces are formed to clamp the connection block 7, and the movement of the ligature rope 8 is more stable and controllable. A scissors 10 is located between the outer tube 1 and the inner tube 2, the scissors 10 being used for severing the ligature 8.

With reference to fig. 1-3 and 9-11, during surgery, an aspiration catheter is first delivered from the inferior vena cava to the left atrial appendage 12 of the patient's heart; the second suction tube 4 and the first suction tube 3 protrude from the inner tube 2, the second adsorption head 42 of the second suction tube 4 is aligned with the end of the left auricle 12, and the second adsorption head 42 adsorbs the left auricle after introducing negative pressure from the second suction tube section 41; accessing negative pressure to the first suction tube 3 from the proximal end of the suction catheter, the second suction head 42 brings the left atrial appendage into the negative pressure range of the first suction head 34 of the first suction tube 3; when the first adsorption head 34 can firmly adsorb and fix the left atrial appendage 12, the second adsorption head 42 can release the negative pressure state. The annular rope portion 81 of the ligature rope 8 is sent out from the inside of the outer tube 1 using the delivery member 6 and the pulling member 5, and the annular rope portion 81 is spread into a loop shape; when the ligature position is proper, the second rope end of the ligature rope 8 is pulled from the proximal end to tighten the annular rope portion 81 so that the ligature rope 8 binds the left atrial appendage; until the left atrial appendage 12 fails to reset, the first suction head 34 can be retracted into the inner tube 2 in a state of releasing the negative pressure. Finally, the ligature rope 8 is continuously tightly bound until the ligature rope 8 can completely bind the left auricle 12, and then the ligature rope 8 is cut off by using the scissors 10, so that the ligature work of the left auricle 12 is completed.

In other embodiments, the ligature rope is annular, and when the ligature rope is pushed to the outside of the outer tube by the delivery member, the ligature rope is strutted by the delivery member, the annular inner diameter becomes large, and after the ligature rope is sleeved on the left atrial appendage, the delivery member is withdrawn, the ligature rope is tightened, the annular inner diameter becomes small, and the ligature rope completes bundling of the left atrial appendage.

Finally, it should be emphasized that the foregoing description is merely illustrative of the preferred embodiments of the utility model, and that various changes and modifications can be made by those skilled in the art without departing from the spirit and principles of the utility model, and any such modifications, equivalents, improvements, etc. are intended to be included within the scope of the utility model.

Claims (10)

1. A suction catheter, comprising:

an outer tube;

the first suction pipe is arranged in the outer pipe, can move along the extending direction of the outer pipe and extends out of the outer pipe;

the ligature rope is arranged inside the outer tube and is used for binding human tissues adsorbed by the suction catheter;

characterized in that the suction catheter further comprises:

the first suction pipe comprises a first adsorption head, the first adsorption head comprises a support framework, at least one part of the support framework is made of memory alloy, a sealing film is arranged on the peripheral surface of the support framework, and the first adsorption head is arranged in the outer pipe in a gathering state;

the first suction pipe stretches out of the outer pipe and can be changed into an unfolding state, and the first adsorption head in the unfolding state is in a horn shape;

and the second suction pipe is arranged in the first suction pipe and can move along the extending direction of the first suction pipe.

2. The aspiration catheter of claim 1, wherein:

the supporting framework is of a net structure.

3. The aspiration catheter of claim 2, wherein:

the sealing film is attached to the inner periphery of the supporting framework.

4. A suction catheter as in any one of claims 1 to 3, wherein:

the aspiration catheter further comprises an inner tube, a connection block, and a delivery member;

the inner tube is arranged between the outer tube and the first suction tube;

the ligature rope surrounds the periphery of the inner tube, and a connecting block is arranged on the ligature rope;

a top groove recessed in the surface of the connecting block is formed in the connecting block;

the delivery piece is arranged between the outer tube and the inner tube, one extending end of the delivery piece is positioned in the top groove, and the delivery piece can push the connecting block along the first direction.

5. The aspiration catheter of claim 4, wherein:

at least a part of the delivery member is made of a memory alloy, the delivery member comprises a first straight line section and a first bending section which are sequentially arranged along the first direction, and the distance between the first bending section and the center of the inner tube along the first direction is gradually increased; when the delivery member is positioned within the outer tube, the delivery member is peripherally constrained by the outer tube.

6. The aspiration catheter of claim 5, wherein:

the suction catheter further comprises a traction piece made of memory alloy, wherein the traction piece is arranged between the outer tube and the inner tube, the traction piece comprises a second straight-line section and a second bending section which are sequentially arranged along a first direction, and the extension end part of the second bending section comprises a back hook;

the connecting block is also provided with a back hook groove which is sunk on the surface of the connecting block, and the back hook groove and the top groove are respectively positioned on two opposite sides of the connecting block;

the extension end part of the return hook is positioned in the return hook groove, the traction piece can apply a pulling force in a second direction to the connecting block, and the second direction is opposite to the first direction.

7. The aspiration catheter of claim 6, wherein:

the suction catheter further comprises a limiting ring, the limiting ring is fixedly connected with the delivery piece, the traction piece penetrates through the through hole of the limiting ring, and the distance between the traction piece and the delivery piece is limited by the limiting ring in the radial direction of the inner tube.

8. A suction catheter as in any one of claims 1 to 3, wherein:

the suction catheter further comprises a ligation block, wherein the ligation block is provided with a first through hole, and a first limiting part is arranged on the inner wall of the first through hole;

the ligature rope comprises a second limiting part, one extending end of the ligature rope is fixedly connected with the ligature block, the other extending end of the ligature rope penetrates through the first through hole along a third direction, an annular rope part is formed on one extending side of the ligature rope, and the first limiting part blocks the second limiting part in a fourth direction;

the third direction is opposite to the fourth direction.

9. The aspiration catheter of claim 8, wherein:

in the fourth direction, the outer diameter of the second limiting portion gradually increases.

10. A suction catheter as in any one of claims 1 to 3, wherein:

the second suction pipe further comprises a suction head in a funnel shape, and the suction head is positioned at one extending end of the second suction pipe.