CN204815116U - Stem cell release in coronary artery bypass grafting postoperative bridge blood vessel - Google Patents

Abstract

The utility model relates to a device for releasing stem cells in grafted blood vessels after coronary artery bypass grafting, which includes a sleeve, a guide needle is arranged inside the sleeve, and the rear end of the sleeve is connected with an infusion tube. A sealing assembly for blocking pinholes, the front end of the infusion tube is connected to the back end of the cannula and installed in the body when used, and the rear end of the infusion tube passes through the skin and is placed outside the body; a hard sheath is set outside the body part of the infusion tube; The sealing component is made of elastic material, and the sealing component includes a guiding needle hole sealing structure and a trocar sealing structure, and the introducing needle is inserted into the cannula through the guiding needle sealing structure. The device is used for intermittent or continuous injection of stem cells into graft vessels after coronary artery bypass grafting. The device is less invasive and can inject stem cells or other therapeutic drugs into graft vessels outside the body at any time. It is simple and convenient to use and can be safely left in the body when not in use. .

Description

Device for releasing stem cells in graft vessels after coronary artery bypass grafting

technical field

The utility model belongs to a medical device for injecting blood or medicine, in particular to a medical device for injecting stem cells or medicine into a graft vessel after coronary artery bypass surgery, and specifically relates to a method for releasing stem cells in a graft vessel after coronary artery bypass surgery. device.

Background technique

Coronary artery bypass graft surgery is to take the patient's own blood vessels (such as the internal thoracic artery, the great saphenous vein of the lower limbs, etc.) or blood vessel substitutes, and connect the distal end of the narrowed coronary artery to the aorta, allowing blood to pass through the narrowed part. Reach the ischemic site, improve myocardial blood supply, and then achieve the purpose of relieving angina symptoms, improving heart function, improving the quality of life of patients and prolonging life. The procedure, called coronary artery bypass grafting, creates a clear path between the aortic root, which is full of arterial blood, and the ischemic heart muscle. This method is often used to treat diseases with blood supply problems such as angina pectoris or myocardial infarction. Cardiomyocytes are terminally differentiated cells, so they cannot be repaired through cell regeneration after myocardial infarction, but form fibrotic scars. Coronary artery bypass grafting (CABG) can recanalize the occluded vessel and revascularize the infarcted myocardium, but it cannot promote the regeneration of the infarcted myocardium, and the long-term prognosis of the postoperative patient cannot be significantly improved.

Autologous bone marrow stem cell transplantation in the treatment of acute myocardial infarction is a brand-new treatment method for the regeneration of myocardial cells in infarcted tissue. The cells can survive for a long time, not only can improve the heart function of adult mice, but also can form an intercalated disc structure with host cells to regenerate cardiomyocytes. The advantages and feasibility of transplanting stem cells into the myocardium to regenerate necrotic cardiomyocytes in the treatment of acute myocardial infarction have attracted attention, and a large number of experimental studies have been carried out for more than 20 years.

In order to regenerate the myocardium, it is often necessary to inject autologous stem cells through graft vessels. The methods currently used mainly include: 1. Coronary injection through the myocardial infarction-related area. 2. Local injection in the myocardial infarction area. 3. Intravenous injection. However, only a small part of transplanted cells can reach the myocardial infarction area through intravenous injection, and the effect is not as good as that through coronary injection.

After coronary artery bypass grafting, in order to regenerate cardiomyocytes, it is necessary to inject or infuse stem cells through the grafted vessels. At present, it is mostly through inserting a balloon catheter, and then injecting bone marrow stem cells into the infarct area with high pressure, and keeping the balloon inflated. The infusion of stem cells is mostly not a one-time use, and the balloon catheter is mostly a one-time use. Each injection needs to be reinserted, causing great pain to the patient. Therefore need a kind of, disposable stem cell or local drug infusion device that can be used repeatedly, carry out continuous or discontinuous infusion stem cell or drug to graft vessel.

The utility model solves the problem that the prior art devices for infusing stem cells or medicines into graft vessels need to be repeatedly inserted, and provides a kind of stem cells in graft vessels that can be placed in graft vessels and inserted multiple times after coronary artery bypass grafting. release device.

Utility model content

In order to overcome the problem of repeated insertion of devices for infusing stem cells or drugs into graft vessels in the prior art, the purpose of this utility model is to provide a device for releasing stem cells in graft vessels after coronary artery bypass grafting that can solve the above problems.

The purpose of this utility model is achieved through the following technical solutions:

A device for releasing stem cells in graft vessels after coronary artery bypass grafting, comprising a sleeve, a guide needle, and an infusion tube, characterized in that the guide needle is inserted into the sleeve through the sleeve or inserted into the sleeve through the rear end of the infusion tube; The front end of the infusion tube is connected to the back end of the cannula, and is set in the body during use; the back end of the infusion tube is passed through the skin and set outside the body; a hard sheath is set outside the middle part of the infusion tube, and the hard sheath is set when in use and inside the body; the outer side of the back of the cannula is provided with a cannula needle hole sealing structure for blocking the cannula needle hole; when the guide needle is inserted from the cannula, the outer side of the cannula is also provided with a guide needle hole sealing structure. The guide needle can guide the cannula into the graft vessel and place it in the graft vessel; the trocar sealing structure is used to seal the trocar hole on the graft vessel after the trocar is pulled out to prevent bleeding; the guide needle hole is closed The structure is used to close the guide needle hole after the guide needle is taken out to prevent bleeding; when the guide needle is inserted into the cannula through the back end of the infusion tube, the guide needle can be pulled out directly during use without considering the problem of blocking the guide needle hole; the infusion tube The cannula is connected and the rear end is set outside the body, and stem cells or drugs can be continuously or intermittently infused from the outside to the graft vessel through the infusion tube. The setting of the hard sheath outside the infusion tube pushes the tube forward when the cannula is pulled out, which can avoid coronary traction.

Further, a handle structure is provided at the rear end of the guide needle to facilitate the operation of the guide needle.

Further, the needle hole sealing structure of the cannula is a soft silicone sheet, and the sealing structure of the trocar needle is closer to the pinhole end than the sealing structure of the guide needle. Before the device is inserted, the silicone sheet is folded backwards. The silicone sheet is released and wraps around the graft. The soft silicone sheet can block the cannula pinhole on the bridge vessel when the device is pulled out, effectively preventing bleeding from the cannula pinhole. In addition, the soft silicone material has certain biological properties. When wrapping the bridge vessel, it will not affect internal blood flow.

Further, bio-glue for adhering bridge vessels is arranged on the silica gel sheet. The setting of bioglue can make the silica gel sheet and the bridge blood vessel tightly combined.

When the guide needle is inserted into the cannula through the sleeve, the guide needle hole sealing structure is made of elastic rubber material and is a rubber layer in close contact with the cannula; or it is set as a paraffin structure that directly blocks the guide needle hole. The arrangement of the elastic rubber material and the paraffin structure can effectively ensure the blocking of pinholes.

Further, the size of the elastic rubber layer of the guide needle hole sealing structure only needs to ensure that the guide needle is inserted and closed after being pulled out, and it can be a small piece of rubber layer that fits on the sleeve, or it can be an annular surrounding The rubber ring of the sleeve, which is preferably an annular rubber ring that is in close contact with the sleeve, the annular setting can ensure the randomness of the needle insertion of the guide needle without selecting a specific direction, and the outer diameter of the annular rubber ring must be Smaller than the inner diameter of the hard sheath, so that when the device is pulled out, it can be pulled out of the body through the sheath smoothly.

Further, the front end of the sheath is provided with a side hole for indwelling in vivo to observe whether there is coronary bleeding after the cannula is pulled out. The setting of the side hole can observe the bleeding situation in time to prevent major accidents.

Further, the rear end of the infusion tube is connected with an infusion bottle or a syringe.

Further, the rear end of the infusion tube is provided with a heparin cap. The heparin cap can ensure multiple and repeated punctures for stem cell infusion and drug infusion, and injection of heparin sodium can prevent blood reflux and anticoagulation.

Further, the external part of the infusion tube is provided with a one-hand clamp to prevent blood from flowing out. The one-hand clamp can mechanically block the outward blood flow and prevent blood from spilling out.

Further, the cannula is integrally connected with the infusion tube without branches, and the integrated arrangement without branches facilitates the removal of the device after use.

Further, the diameters of the cannula, the guide needle and the infusion tube are consistent with the existing diameters, and the lengths of the tubes are subject to the need to ensure that the operation can be realized.

When in use, during coronary artery bypass surgery, under direct vision, insert the cannula through the guide needle into the bridge vessel, then pull out the guide needle, and leave the cannula in the bridge vessel. When the guide needle is inserted through the cannula When inside the tube, guide the pinhole sealing structure to block the guide pin hole; finally release the soft silicone sheet of the cannula pinhole sealing structure to wrap around the bridge vessel; finally adjust the position of the back-end infusion tube and hard sheath tube; Suture the surgical site. In this way, part of the device stays in the body, the rear part of the infusion tube stays outside the body, and the one-hand clip is closed; when stem cells or drugs need to be infused, the blood transfusion device or drug infusion device is connected to the infusion tube, and the one-hand clip is opened to perform stem cell injection. Or drug infusion; after the infusion is completed, remove the blood transfusion device or connect the drug infusion device to the infusion tube, and close the one-hand clamp. After all the infusion of stem cells and required drugs is completed, just pull out the part of the infusion tube, then open a small hole, take out the hard sheath, and the soft silicone sheet will automatically seal the needle hole of the cannula to complete the use of the device.

Compared with the prior art, the setting of the cannula guide needle of the present invention can make the cannula stay in the graft vessel for a long time, avoiding repeated needle sticking of the graft vessel; the setting of the infusion tube ensures the infusion of stem cells and drugs from the outside of the body, Effectively avoid traumatic surgery; the cannula pinhole sealing structure and guide pinhole sealing structure can effectively prevent pinhole bleeding; the hard sheath can prevent excessive pulling on the blood vessel when it is taken out; the device can achieve one-time insertion, multiple Long-term use can effectively prevent traumatic surgery and repeated needle sticking of graft vessels.

Description of drawings

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

Fig. 2 is the structural representation of embodiment 2 of the present invention;

Fig. 3 is a schematic structural diagram of Embodiment 3 of the present invention;

Fig. 4 is a schematic diagram of an enlarged partial structure of the upper part of Embodiment 3 of the present invention;

Fig. 5 is a schematic diagram of a partially enlarged structure of the lower structure of Embodiment 3 of the present invention;

In the figure, 1. Cannula; 2. Guide needle; 21. Handle structure; 31. Guide needle hole sealing structure; 32. Cannula needle hole sealing structure; 4. Infusion tube; 5. Rigid sheath; 6. Heparin 7. One-hand clip.

Detailed ways

Embodiment 1 A device for releasing stem cells in graft vessels after coronary artery bypass grafting

A device for releasing stem cells in graft vessels after coronary artery bypass grafting, comprising a cannula 1, a guide needle 2 is arranged inside the cannula 1, and the back end of the cannula 1 is connected to an infusion tube 4, wherein the cannula is inserted into the cannula through the back end of the infusion tube , the outer cannula pinhole sealing structure 32 at the back of the cannula 1 is used to block the cannula pinhole; the front end of the infusion tube 4 is connected to the back end of the cannula 1 and arranged in the body, and the back end of the infusion tube 4 is pierced through the skin and arranged in the Outside the body; a hard sheath tube 5 is set outside the body part of the infusion tube 4; the trocar hole sealing structure is used to block the trocar hole on the bridge vessel after the trocar is pulled out to prevent bleeding; the infusion tube 4 is connected to The back end of the cannula 1 is set outside the body, and the infusion tube 4 can be used to continuously or intermittently infuse stem cells or drugs from outside the body to the graft vessel. The setting of the hard sheath tube 5 outside the infusion tube 4 pushes the tube forward when pulling out the sleeve tube 1, which can avoid coronary traction. The sleeve tube 1 is integrally connected with the infusion tube 4 without branching, and the setting of one body without branching facilitates the taking out of the device after use.

A handle structure is provided at the rear end of the guide needle 2 to facilitate the operation of the guide needle 2 . The cannula needle hole sealing structure 32 is a soft silicone sheet. The trocar sealing structure is closer to the pinhole end than the guide needle 2 sealing structure. Released to wrap around the bridge vessel. The soft silicone sheet can block the cannula pinhole on the bridge vessel when the device is pulled out, effectively preventing bleeding from the cannula pinhole. In addition, the soft silicone material has certain biological properties. When wrapping the bridge vessel, it will not affect internal blood flow. Biological glue for bonding bridge blood vessels is set on the silica gel sheet. The setting of bioglue can make the silica gel sheet and the bridge blood vessel tightly combined. The rear end of the infusion tube 4 is connected with an infusion bottle or a syringe. The rear end of the infusion tube 4 is provided with a heparin cap 6 . The heparin cap 6 can ensure multiple and repeated punctures for stem cell infusion and drug infusion, and injection of heparin sodium can prevent blood reflux and anticoagulation. The external part of the infusion tube 4 is provided with a one-hand clamp 7 to prevent blood from flowing out. The one-hand clamp 7 can mechanically block the outward blood flow and prevent blood from spilling out. The length of infusion tube 4 is set to 20cm.

When in use, when performing coronary artery bypass surgery, under direct vision, hold the handle structure, insert the cannula 1 through the guide needle 2 into the bridge vessel, then pull out the guide needle 2, and leave the cannula 1 in the bridge vessel. Finally, release the soft silicone sheet of the cannula needle hole sealing structure 32 to wrap around the bridge vessel; finally adjust the positions of the rear end infusion tube 4 and the hard sheath tube 5; and finally suture the surgical site. This device just stays in the body like this, and the rear portion of infusion tube 4 stays outside the body, closes one-hand clamp 7; , to perform infusion of stem cells or drugs; after the infusion is completed, take off the blood transfusion device or drug infusion device and connect it to the infusion tube 4, and close the one-hand clamp 7. After all the infusion of stem cells and required drugs is completed, just pull out part 4 of the infusion tube, then open a small hole, take out the hard sheath tube 5, and the soft silicone sheet will automatically seal the pinhole of the tube to complete the use of the device .

Example 2 A device for releasing stem cells in graft vessels after coronary artery bypass grafting

A device for releasing stem cells in graft vessels after coronary artery bypass grafting, comprising a cannula 1, a guide needle 2 is arranged inside the cannula 1, and the rear end of the cannula 1 is connected to an infusion tube 4, wherein the guide needle 2 is inserted into the cannula through the cannula 1 Inside 1, the guide pinhole sealing structure 31 and the cannula pinhole closing structure 32 on the outside of the rear part of the cannula 1 are respectively used to block the guide pinhole and the cannula needle hole; the front end of the infusion tube 4 is connected to the rear end of the cannula 1 In the body, the rear end of the infusion tube 4 is pierced through the skin and placed outside the body; a hard sheath tube 5 is arranged outside the body part of the infusion tube 4; the guide needle 2 can guide the cannula 1 into the graft vessel and place it in the bridge vessel; the trocar The hole sealing structure is used to block the trocar hole on the bridge vessel after the trocar is pulled out to prevent bleeding; the infusion tube 4 is connected to the cannula 1 and the rear end is set outside the body, and can be continuous or intermittent through the infusion tube 4 Infusion of stem cells or drugs into graft vessels from outside the body. The setting of the hard sheath tube 5 outside the infusion tube 4 pushes the tube forward when pulling out the sleeve tube 1, which can avoid coronary traction. The sleeve tube 1 is integrally connected with the infusion tube 4 without branching, and the setting of one body without branching facilitates the taking out of the device after use.

A handle structure is provided at the rear end of the guide needle 2 to facilitate the operation of the guide needle 2 . The guiding pinhole sealing structure 31 is a paraffin structure for direct sealing, and is directly sealed with paraffin after the guiding needle is pulled out. The cannula needle hole sealing structure 32 is a soft silicone sheet. The trocar sealing structure is closer to the pinhole end than the guide needle 2 sealing structure. Released to wrap around the bridge vessel. The soft silicone sheet can block the cannula pinhole on the bridge vessel when the device is pulled out, effectively preventing bleeding from the cannula pinhole. In addition, the soft silicone material has certain biological properties. When wrapping the bridge vessel, it will not affect internal blood flow. Biological glue for bonding bridge blood vessels is set on the silica gel sheet. The setting of bioglue can make the silica gel sheet and the bridge blood vessel tightly combined. The rear end of the infusion tube 4 is connected with an infusion bottle or a syringe. The rear end of the infusion tube 4 is provided with a heparin cap 6 . The heparin cap 6 can ensure multiple and repeated punctures for stem cell infusion and drug infusion, and injection of heparin sodium can prevent blood reflux and anticoagulation. The external part of the infusion tube 4 is provided with a one-hand clamp 7 to prevent blood from flowing out. The one-hand clamp 7 can mechanically block the outward blood flow and prevent blood from spilling out. The length of infusion tube 4 is set to 20cm.

When in use, when performing coronary artery bypass surgery, under direct vision, hold the handle structure, insert the cannula 1 through the guide needle 2 into the bridge vessel, then pull out the guide needle 2, and leave the cannula 1 in the bridge vessel. Use paraffin material to block the guide pinhole; finally release the soft silicone sheet of the cannula pinhole sealing structure 32 to wrap around the bridge vessel; finally adjust the position of the rear end infusion tube 4 and the hard sheath tube 5; finally adjust the position of the surgical site Do the stitching. This device just stays in the body like this, and the rear portion of infusion tube 4 stays outside the body, closes one-hand clamp 7; , to perform infusion of stem cells or drugs; after the infusion is completed, take off the blood transfusion device or drug infusion device and connect it to the infusion tube 4, and close the one-hand clamp 7. After all the infusion of stem cells and required drugs is completed, just pull out part 4 of the infusion tube, then open a small hole, take out the hard sheath tube 5, and the soft silicone sheet will automatically seal the pinhole of the tube to complete the use of the device .

Example 3 A device for releasing stem cells in grafted vessels after coronary artery bypass grafting

A device for releasing stem cells in graft vessels after coronary artery bypass grafting, comprising a cannula 1, a guide needle 2 is arranged inside the cannula 1, and the rear end of the cannula 1 is connected to an infusion tube 4, wherein the guide needle 2 is inserted into the cannula through the cannula 1 Inside 1, the guide pinhole sealing structure 31 and the cannula pinhole closing structure 32 on the outside of the rear part of the cannula 1 are respectively used to block the guide pinhole and the cannula needle hole; the front end of the infusion tube 4 is connected to the rear end of the cannula 1 In the body, the rear end of the infusion tube 4 is pierced through the skin and placed outside the body; a hard sheath 5 is arranged outside the body of the infusion tube 4; the guide needle 2 can guide the sleeve 1 into the graft vessel and place it in the bridge vessel; the elastic guide needle The hole sealing structure 31 seals the pinhole to prevent bleeding; the trocar sealing structure is used to block the trocar hole on the bridge vessel after the trocar is pulled out to prevent bleeding; the infusion tube 4 is connected to the sleeve 1 and then The end is set in vitro, and can continuously or intermittently infuse stem cells or medicines from the outside to the graft vessel through the infusion tube 4 . The setting of the hard sheath tube 5 outside the infusion tube 4 pushes the tube forward when pulling out the sleeve tube 1, which can avoid coronary traction. The sleeve tube 1 is integrally connected with the infusion tube 4 without branching, and the setting of one body without branching facilitates the taking out of the device after use.

A handle structure is provided at the rear end of the guide needle 2 to facilitate the operation of the guide needle 2 . The guide needle hole sealing structure 31 is an elastic rubber layer, specifically a ring-shaped rubber ring that is in close contact with the sleeve 1. The ring-shaped arrangement can ensure that the guide needle 2 can enter the needle at will without selecting a specific direction. The outer diameter of the annular rubber ring is smaller than the inner diameter of the hard sheath tube 5, so that when the device is pulled out, it can be pulled out of the body through the sheath tube 5 smoothly. The cannula needle hole sealing structure 32 is a soft silicone sheet. The trocar sealing structure is closer to the pinhole end than the guide needle 2 sealing structure. Released to wrap around the bridge vessel. The soft silicone sheet can block the cannula pinhole on the bridge vessel when the device is pulled out, effectively preventing bleeding from the cannula pinhole. In addition, the soft silicone material has certain biological properties. When wrapping the bridge vessel, it will not affect internal blood flow. Biological glue for bonding bridge blood vessels is set on the silica gel sheet. The setting of bioglue can make the silica gel sheet and the bridge blood vessel tightly combined. The rear end of the infusion tube 4 is connected with an infusion bottle or a syringe. The rear end of the infusion tube 4 is provided with a heparin cap 6 . The heparin cap 6 can ensure multiple and repeated punctures for stem cell infusion and drug infusion, and injection of heparin sodium can prevent blood reflux and anticoagulation. The external part of the infusion tube 4 is provided with a one-hand clamp 7 to prevent blood from flowing out. The one-hand clamp 7 can mechanically block the outward blood flow and prevent blood from spilling out. The length of infusion tube 4 is set to 20cm.

When in use, when performing coronary artery bypass surgery, under direct vision, hold the handle structure, insert the cannula 1 through the guide needle 2 into the bridge vessel, then pull out the guide needle 2, and leave the cannula 1 in the bridge vessel. The guide pinhole sealing structure 31 rubber ring seals the guiding pinhole; finally release the soft silicone sheet of the cannula pinhole sealing structure 32 to wrap around the bridge blood vessel; position; the surgical site is then sutured. This device just stays in the body like this, and the rear portion of infusion tube 4 stays outside the body, closes one-hand clamp 7; , to perform infusion of stem cells or drugs; after the infusion is completed, take off the blood transfusion device or drug infusion device and connect it to the infusion tube 4, and close the one-hand clamp 7. After all the infusion of stem cells and required drugs is completed, just pull out part 4 of the infusion tube, then open a small hole, take out the hard sheath tube 5, and the soft silicone sheet will automatically seal the pinhole of the tube to complete the use of the device .

Example 4 A device for releasing stem cells in grafted vessels after coronary artery bypass grafting

A device for releasing stem cells in graft vessels after coronary artery bypass grafting, comprising a cannula 1, a guide needle 2 is arranged inside the cannula 1, and the rear end of the cannula 1 is connected to an infusion tube 4, wherein the guide needle 2 is inserted into the cannula through the cannula 1 Inside 1, the guide pinhole sealing structure 31 and the cannula pinhole closing structure 32 on the outside of the rear part of the cannula 1 are respectively used to block the guide pinhole and the cannula needle hole; the front end of the infusion tube 4 is connected to the rear end of the cannula 1 In the body, the rear end of the infusion tube 4 is pierced through the skin and placed outside the body; a hard sheath tube 5 is arranged outside the body part of the infusion tube 4; the guide needle 2 can guide the cannula 1 into the graft vessel and place it in the bridge vessel; the trocar The closed structure is used to block the trocar hole on the bridge vessel after the trocar is pulled out to prevent bleeding; the infusion tube 4 is connected to the cannula 1 and the rear end is set outside the body, and can be continuously or intermittently passed through the infusion tube 4 Stem cells or drugs are infused into grafted vessels from outside the body. The setting of the hard sheath tube 5 outside the infusion tube 4 pushes the tube forward when pulling out the sleeve tube 1, which can avoid coronary traction. The sleeve tube 1 is integrally connected with the infusion tube 4 without branching, and the setting of one body without branching facilitates the taking out of the device after use.

A handle structure is provided at the rear end of the guide needle 2 to facilitate the operation of the guide needle 2 . The guide pinhole sealing structure 31 is made of elastic rubber material, and is a rubber layer in close contact with the sleeve 1 . The rubber layer only partially surrounds the casing 1, and its size can ensure the passing of the guide needle 2 and the plugging effect on the needle hole after being pulled out. The outer diameter of the annular rubber ring is smaller than the inner diameter of the hard sheath tube 5, so that when the device is pulled out, it can be pulled out of the body through the sheath tube 5 smoothly. The cannula needle hole sealing structure 32 is a soft silicone sheet. The trocar sealing structure is closer to the pinhole end than the guide needle 2 sealing structure. Released to wrap around the bridge vessel. Biological glue for bonding bridge blood vessels is set on the silica gel sheet. The setting of bioglue can make the silica gel sheet and the bridge blood vessel tightly combined. The front end of the sheath tube 5 is provided with a side hole for indwelling in vivo to observe whether there is coronary bleeding after the cannula 1 is pulled out. The setting of the side hole can observe the bleeding situation in time to prevent major accidents. The rear end of the infusion tube 4 is connected with an infusion bottle or a syringe. The rear end of the infusion tube 4 is provided with a heparin cap 6 . The heparin cap 6 can ensure multiple and repeated punctures for stem cell infusion and drug infusion, and injection of heparin sodium can prevent blood reflux and anticoagulation. The external part of the infusion tube 4 is provided with a one-hand clamp 7 to prevent blood from flowing out. The one-hand clamp 7 can mechanically block the outward blood flow and prevent blood from spilling out. The length of infusion tube 4 is set to 15cm.

When in use, when performing coronary artery bypass surgery, under direct vision, hold the handle structure, insert the cannula 1 through the guide needle 2 into the bridge vessel, then pull out the guide needle 2, and leave the cannula 1 in the bridge vessel. The guide pinhole sealing structure 31 rubber ring seals the guiding pinhole; finally release the soft silicone sheet of the cannula pinhole sealing structure 32 to wrap around the bridge blood vessel; position; the surgical site is then sutured. This device just stays in the body like this, and the rear portion of infusion tube 4 stays outside the body, closes one-hand clamp 7; , to perform infusion of stem cells or drugs; after the infusion is completed, take off the blood transfusion device or drug infusion device and connect it to the infusion tube 4, and close the one-hand clamp 7. After all the infusion of stem cells and required drugs is completed, just pull out part 4 of the infusion tube, then open a small hole, take out the hard sheath tube 5, and the soft silicone sheet will automatically seal the pinhole of the tube to complete the use of the device .

The description of the above embodiment is only for understanding the utility model. It should be pointed out that those skilled in the art can make some improvements to the utility model without departing from the principle of the utility model, and these improvements will also fall into the protection scope of the claims of the utility model.

Claims (10)

1. a device for releasing stem cells in a graft vessel after coronary artery bypass grafting, comprising a sleeve (1), a guide needle (2), and an infusion tube (4), characterized in that the guide needle (2) passes through the sleeve ( 1) Insert into the casing (1) or insert into the casing (1) through the rear end of the infusion tube (4); the front end of the infusion tube (4) is connected to the rear end of the casing (1); the infusion tube (4) ) a hard sheath tube (5) is set outside the middle part; a trocar hole sealing structure (32) for blocking the trocar hole is set outside the rear part of the cannula (1); when the guide needle (2) from When the cannula (1) is inserted, a guide needle hole sealing structure (31) is also provided on the outside of the rear part of the cannula (1). 2. The device for releasing stem cells in grafted blood vessels after coronary artery bypass grafting according to claim 1, characterized in that, the guide pinhole sealing structure (31) is made of elastic rubber material or is directly plugged with paraffin wax structure, wherein the elastic rubber material is a rubber layer in close contact with the casing (1). 3 . The device for releasing stem cells in grafted vessels after coronary artery bypass grafting according to claim 2 , characterized in that, the guide pinhole sealing structure ( 31 ) is ring-shaped and closely contacts the rubber layer with the sleeve ( 1 ). 4 . 4. The device for releasing stem cells in grafted blood vessels after coronary artery bypass grafting according to claim 1, characterized in that, the cannula needle hole sealing structure (32) is a soft silica gel sheet, and the cannula (1) needle is closed The structure is closer to the end of the pinhole than the closed structure of the guide needle (2). Before the device is inserted, the silicone sheet is folded backwards. After the puncture is inserted, the silicone sheet is released to wrap around the bridge vessel. 5 . The device for releasing stem cells in grafted blood vessels after coronary artery bypass grafting according to claim 4 , wherein the silicone sheet is provided with biological glue for adhering the grafted blood vessels. 5 . 6. The device for releasing stem cells in graft vessels after coronary artery bypass grafting according to claim 1, characterized in that, the front end of the sheath tube (5) is set for indwelling in vivo to observe whether there is coronary bleeding after the sleeve tube (1) is pulled out side hole. 7 . The device for releasing stem cells in graft vessels after coronary artery bypass grafting according to claim 1 , wherein the rear end of the infusion tube ( 4 ) is connected to an infusion bottle or a syringe. 8 . 8. The device for releasing stem cells in graft vessels after coronary artery bypass grafting according to claim 1, characterized in that a heparin cap (6) is provided at the rear end of the infusion tube (4). 9. The device for releasing stem cells in grafted blood vessels after coronary artery bypass grafting according to claim 1, characterized in that, the infusion tube (4) is provided with a one-hand clip to prevent blood from flowing out of the body. 10. The device for releasing stem cells in grafted vessels after coronary artery bypass grafting according to any one of claims 1-9, characterized in that the cannula (1) is integrally connected with the infusion tube (4) without branches.