CN107736909B - Device for cutting off tube after interventional embolization of cerebral arteriovenous malformation - Google Patents

Abstract

The invention relates to a device for cutting off a left tube after an interventional embolism operation of arteriovenous malformations, wherein a bending cavity is arranged at the head end of a body, the bending cavity is communicated, a cutting surface is arranged at the bending position close to the head end of the body, and a cutting edge is arranged at the relative position of the cutting surface; the cutter head enters and exits from the cutter outlet, the cutter head is fixed on a sliding sheet, the sliding sheet is fixed on a spring and slides in the body, the other end of the spring is fixed on a fixing sheet, and the fixing sheet is fixed in the body; one end of the first pull wire penetrates through the spring and is fixed on the sliding plate, the other end of the first pull wire is fixed on the pull ring, when the first pull wire is pulled, the spring is contracted, the cutter head returns to the cutter outlet, and when the first pull wire is released, the spring is sprung open, and the cutter head extends out of the cutter outlet. The cutting device has small volume, can go deep into focus position, effectively cuts, has short tube-retaining length, is simple and convenient to operate, and shortens operation time.

Description

Device for cutting off tube after interventional embolization of cerebral arteriovenous malformation

technical field

The invention relates to the technical field of medical equipment, in particular to a cutting device with a small size, capable of penetrating into the lesion, effective cutting, short length of the tube, easy to operate, and shortening operation time.

Background technique

Cerebral arteriovenous malformation is a congenital variant of focal cerebral angiogenesis. The absence of capillaries between cerebral arteries and cerebral veins in the diseased area leads to direct communication between arteries and veins, forming a short circuit between arteries and veins, resulting in a series of cerebral hemodynamic disorders. Clinically, it often manifests as repeated intracranial hemorrhage, partial or generalized seizures, transient ischemic attack, and progressive neurological dysfunction, and is also the second cause of intracranial spontaneous subarachnoid hemorrhage.

Cerebral vascular malformation has no drug treatment for the lesion at present, and the current treatment methods are only craniotomy surgical resection, minimally invasive endovascular interventional embolization therapy and stereotactic radiotherapy (including Gamma Knife, X-Knife, CyberKnife, etc.) . Among them, the advantage of surgical resection is that it is possible to completely remove the lesion at one time, but the disadvantage is that the trauma of the craniotomy may damage the brain tissue around the deformity during the resection, resulting in functional damage, and the operation may cause massive bleeding; The rupture risk structure (such as concurrent aneurysm) in the embolism malformation can reduce the blood flow to improve the safety of subsequent resection, and can also reduce the volume after embolization to facilitate subsequent stereotactic radiotherapy. The disadvantage is that only some Patients can radically cure the disease through simple interventional embolization; the advantage of stereotactic radiotherapy is that it is more minimally invasive, but the disadvantage is that this treatment cannot eliminate the lesion immediately, and it often takes 2-3 years or even longer to disappear slowly (in this case Bleeding may still occur for a period of time), in addition, a small number of patients may not be effective, and it is generally not suitable for larger vascular malformations with a diameter of more than 3 cm.

Microcatheter glue embolization is an important method for the treatment of cerebral arteriovenous malformations, but there is a risk of glue reflux sticking to the tip of the microcatheter. In this case, most people choose to leave the microcatheter in the body, but there are risks of infection and vascular embolism. , the risk of cerebral infarction; there are also a small number of people who want to take out the microcatheter under direct vision during the operation by means of surgery, but the trauma is large, the amount of bleeding is large, and it is not suitable for deep lesions. Therefore, it is necessary to keep the length of the tube as short as possible, and the volume of the cut-off device may be small.

There is a need for a cutting device that is small in size, can go deep into the lesion, effectively cut off, has a short length of the catheter, is easy to operate, and shortens the operation time.

Contents of the invention

The purpose of the present invention is to provide a cutting device with small size, capable of penetrating into the lesion, effective cutting, short indwelling tube length, easy operation, and shortened operation time.

The tube cut-off device after interventional embolization of cerebral arteriovenous malformation includes:

The body, the head end of the body is provided with a bending cavity, and the bending cavity is connected, and a truncated surface is provided at the bending place close to the head end of the body, and a knife edge is set at the relative position of the truncated surface;

The cutter head, the cutter head enters and exits at the knife edge, the cutter head is fixed on the sliding piece, the sliding piece is fixed on the spring, and slides inside the body, the other end of the spring is fixed on the fixed piece, and the fixed piece fixed inside the body;

The first pull wire, one end of the first pull wire passes through the spring and is fixed on the sliding piece, and the other end is fixed on the pull ring. When the first pull wire is pulled, the spring shrinks, and the knife head returns to the knife edge. When a backguy is unclamped, the spring bounces off, and the knife head stretches out from the knife edge.

The body is a linear elastic tube.

The bending cavity is in the shape of a zigzag line or an arc, the inlet of the bending cavity extends into the extended section of the microcatheter, and the outlet extends out of the microcatheter.

The truncated surface is flake or block, corresponding to the cutter head.

The knife outlet is provided with a guide cavity, the guide cavity is tubular, and a linearly moving cutter head is placed inside.

The included angle between the sliding sheet and the inner wall of the main body is constant.

The first pull wire is tied to the end of the pull ring away from the body.

The first pull wires are fixed in the middle of the sliding sheet, and the second pull wires are arranged around the periphery, and the number of the second pull wires is more than two.

The second pull wire is fixed at one point on the pull ring.

The pull ring is ring-shaped, and a protrusion is provided close to the body to lean against the body.

The head end of the main body of the present invention is provided with a bending cavity, the bending cavity is connected, a truncated surface is set near the head end of the body at the bending point, and a knife edge is set at the relative position of the truncated surface; The piece is fixed on the spring and slides inside the body, the other end of the spring is fixed on the fixed piece, and the fixed piece is fixed inside the body; one end of the first pull wire passes through the spring and is fixed on the sliding piece, and the other end is fixed on the pull ring. When the first backguy wire is pulled, the spring shrinks, and the cutter head gets back in the outlet of the knife, and when the first backguy wire is loosened, the spring bounces off, and the cutter head stretches out from the outlet of the knife. The extended end of the micro-catheter passes through the bending cavity in the body, bends the micro-catheter, and places it between the truncated surface and the exit edge. The sliding piece is pulled by the first pull wire, the spring shrinks to store force, the sliding piece drives the cutter head to move towards the fixed piece, the first pull wire is fixed on the pull ring, the first pull wire is cut, the spring pops up, pushing the sliding piece and the cutter head to move, the cutter head Stretch out the knife edge and cooperate with the truncated surface to cut off the microcatheter. The truncation device of the present invention is small in volume, can go deep into the lesion position, effectively truncates, has a short length of tube, is easy to operate, and shortens operation time.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the schematic diagram that the cutter head of the present invention is located at the position of recovering and accumulating force;

Fig. 3 is the schematic diagram that the cutter head of the present invention is located at the working position;

In the figure: 1. body, 2. bending cavity, 3. truncated surface, 4. knife exit, 5. knife head, 6. sliding piece, 7. spring, 8. fixed piece, 9. first pull wire, 10. Pull ring, 11, second stay wire, 12, microcatheter, 13, lesion.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

Example 1:

The catheter cutting device after interventional embolization of cerebral arteriovenous malformation includes: body 1, a bending cavity 2 is set at the head end of body 1, the bending cavity 2 is connected, and a truncated surface 3 is set at the bending place near the head end of body 1, and the truncated surface 3 The knife edge 4 is set at the relative position; the knife head 5, the knife head 5 enters and exits at the knife edge 4, the knife head 5 is fixed on the sliding piece 6, the sliding piece 6 is fixed on the spring 7, and slides inside the body 1, and the spring 7 is another One end is fixed on the fixed piece 8, and the fixed piece 8 is fixed inside the body 1; the first stay wire 9, one end of the first stay wire 9 passes through the spring 7, and is fixed on the sliding piece 6, and the other end is fixed on the pull ring 10, the first When backguy 9 was pulled, spring 7 contracted, and cutter head 5 got back in the edge of a knife 4, and when the first backguy 9 was unclamped, spring 7 bounced off, and cutter head 5 stretched out from edge of a knife 4.

The body 1 is a linear elastic tube. The bending cavity 2 is in the shape of a zigzag line or an arc. The inlet of the bending cavity 2 extends into the outstretched section of the microcatheter 12 , and the outlet extends out of the microcatheter 12 . The truncated surface 3 is in the form of a sheet or a block, corresponding to the cutter head 5 . A guide cavity is arranged at the knife edge 4, and the guide cavity is tubular, and a linearly moving cutter head 5 is placed inside. The included angle between the sliding piece 6 and the inner wall of the main body 1 is constant. The first pull wire 9 is tied to the end of the pull ring 10 away from the body 1 . The first pull wire 9 is fixed in the middle of the sliding piece 6, and the second pull wire 11 is arranged around the periphery, and the number of the second pull wire 11 is more than two. The second pull wire 11 is fixed at one point on the pull ring 10 . The pull ring 10 is ring-shaped, and a protrusion is provided near the body 1 to lean against the body 1 .

After interventional embolization of cerebral arteriovenous malformation, the microcatheter 12 is inserted into the lesion 13 to inject glue into the lesion 13, and the shortest microcatheter 12 is placed in the lesion 13 after completion. The extending end of the microcatheter 12 passes through the bending cavity 2 in the body 1 , and the microcatheter 12 is bent and placed between the truncated surface 3 and the knife edge 4 .

The sliding piece 6 is pulled by the first backguy 9, and the spring 7 shrinks to store force. The sliding piece 6 drives the cutter head 5 to move toward the fixed piece 8, the first backguy 9 is fixed on the pull ring 10, the first backguy 9 is cut off, and the spring 7 pops up. Push the sliding piece 6 and the knife head 5 to move, the knife head 5 protrudes out of the knife edge 4 and cooperates with the section surface 3 to cut off the microcatheter 12 . The reserved length of the second pull wire 11 in the body 1 is slightly longer than that of the first pull wire 9 . Using a new type of intravascular catheter cutting device to remove the indwelling microcatheter greatly reduces the operation time and the incidence of surgical complications compared with craniotomy.

Gently pull out the first pull wire 9 behind the pull ring 10 and cut it off. After the pressure of the compressed spring 7 at the head end of the body 1 is released, the cutter head 5 is pushed out of the knife edge 4 and cut forward; if the microcatheter 12 is cut off successfully, It can be taken out of the body together with the cutting device; if unsuccessful, multiple attempts can be made to cut multiple times, and the pull ring 10 at the rear end of the body 1 is pulled back, and the second pull wire 11 replaces the first pull wire 9 to pull the sliding piece 6, and the cutter head 5 is removed. Pull back out of the knife edge 4, and after releasing the handle force, the knife head 5 is pushed out again for secondary cutting until it succeeds.

The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments, and that described in the above-mentioned embodiments and the description only illustrates the principles of the present invention, and the present invention also has various aspects without departing from the spirit and scope of the present invention. Variations and improvements all fall within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their equivalents.

Claims (8)

1. The utility model provides a brain artery and vein malformation intervenes embolic postoperative stay tube cuts device which characterized in that includes:

the bending cavity (2) is arranged at the head end of the body (1), the bending cavity (2) is communicated, a cut-off surface (3) is arranged at the bending position close to the head end of the body (1), and a knife edge (4) is arranged at the opposite position of the cut-off surface (3);

the cutter head (5), the cutter head (5) goes in and out at the outlet edge (4), the cutter head (5) is fixed on the sliding sheet (6), the sliding sheet (6) is fixed on the spring (7) and slides in the body (1), the other end of the spring (7) is fixed on the fixing sheet (8), and the fixing sheet (8) is fixed in the body (1);

the body (1) is a linear elastic tube; the included angle between the transverse direction of the sliding piece (6) and the inner wall of the body (1) is unchanged;

the first stay wire (9), spring (7) are passed to first stay wire (9) one end to fix on slider (6), the other end is fixed on pull ring (10), when first stay wire (9) were pulled, spring (7) shrink, tool bit (5) get back into in play edge of a knife (4), when first stay wire (9) were released, spring (7) bullet was opened, and tool bit (5) were stretched out from play edge of a knife (4).

2. The device for cutting off the left tube after cerebral arterial venous malformation interventional embolism according to claim 1, wherein the bending cavity (2) is in a zigzag shape or an arc shape, an inlet of the bending cavity (2) stretches into an overhanging section of the microcatheter (12), and an outlet stretches out of the microcatheter (12).

3. The device for cutting off the left tube after cerebral arterial venous malformation interventional embolism according to claim 1, wherein the cutting-off surface (3) is sheet-shaped or block-shaped and corresponds to the cutter head (5).

4. The device for cutting off the left tube after cerebral arterial venous malformation interventional embolism according to claim 1, wherein the outlet knife edge (4) is provided with a guiding cavity, the guiding cavity is tubular, and a cutter head (5) which moves linearly is arranged inside the guiding cavity.

5. The device for cutting off a tube after cerebral arterial venous malformation interventional embolism according to claim 1, characterized in that the first pull wire (9) is tied at one end of the pull ring (10) far away from the body (1).

6. The device for cutting off a tube after cerebral arterial venous malformation interventional embolism according to claim 1, wherein the first pull wire (9) is fixed at the middle part of the sliding sheet (6), the periphery is provided with second pull wires (11), and the number of the second pull wires (11) is more than two.

7. The post-embolic tube cutoff device for cerebral arterial venous malformation intervention as in claim 6, wherein the second pull wire (11) is fixed at a point on the pull ring (10).

8. The device for cutting off the left tube after cerebral arterial venous malformation interventional embolism according to claim 1, wherein the pull ring (10) is annular, a bulge is arranged near the body (1) and is abutted against the body (1).