WO2018121352A1 - 载药器械及其制备方法 - Google Patents
载药器械及其制备方法 Download PDFInfo
- Publication number
- WO2018121352A1 WO2018121352A1 PCT/CN2017/117225 CN2017117225W WO2018121352A1 WO 2018121352 A1 WO2018121352 A1 WO 2018121352A1 CN 2017117225 W CN2017117225 W CN 2017117225W WO 2018121352 A1 WO2018121352 A1 WO 2018121352A1
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- WIPO (PCT)
- Prior art keywords
- drug
- protective sleeve
- loading device
- balloon
- eluting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/10—Balloon catheters
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/0021—Catheters; Hollow probes characterised by the form of the tubing
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/0043—Catheters; Hollow probes characterised by structural features
- A61M25/0045—Catheters; Hollow probes characterised by structural features multi-layered, e.g. coated
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/10—Balloon catheters
- A61M25/1027—Making of balloon catheters
- A61M25/1038—Wrapping or folding devices for use with balloon catheters
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M31/00—Devices for introducing or retaining media, e.g. remedies, in cavities of the body
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/10—Balloon catheters
- A61M2025/1043—Balloon catheters with special features or adapted for special applications
- A61M2025/105—Balloon catheters with special features or adapted for special applications having a balloon suitable for drug delivery, e.g. by using holes for delivery, drug coating or membranes
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/10—Balloon catheters
- A61M2025/1043—Balloon catheters with special features or adapted for special applications
- A61M2025/1081—Balloon catheters with special features or adapted for special applications having sheaths or the like for covering the balloon but not forming a permanent part of the balloon, e.g. retractable, dissolvable or tearable sheaths
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2210/00—Anatomical parts of the body
- A61M2210/12—Blood circulatory system
Definitions
- the invention belongs to the field of medical instruments, and relates to a drug-loading device and a preparation method thereof.
- endovascular intervention Compared with traditional open surgery, endovascular intervention has the advantages of less trauma, quick recovery, low complication rate and high curative effect, and it has gradually become the first choice for vascular surgeons to treat vascular diseases.
- DEB Drug Eluting Balloon
- the principle is that the active drug is applied to the surface of the expandable balloon and the expandable balloon is delivered to the human lesion. The filling and expansion expands the active drug to the blood vessel wall and exerts its efficacy.
- the expandable balloon of the coated drug needs to be folded and wound into the protective sleeve.
- Drug Eluting Stent is also a minimally invasive surgical treatment method.
- the principle is to apply a drug coating on the surface of the bare stent, and then transport the DES to the human lesion and expand it. The layer is slowly released and continues to exert its effects.
- DES usually requires a common expandable balloon to assist in expansion. Therefore, in the production process of DES, it is necessary to press the DES to the outside of the expandable balloon that has been folded and wound, and then put the crimped expandable balloon and DES into the protective sleeve.
- the protective sleeve has the function of protecting the drug coating, and can prevent the drug coating from being damaged during production and transportation. At the same time, the protective sleeve can bind the drug-loading device to a smaller outer diameter size, which facilitates the smooth passage of the drug-loading device through the distorted human blood vessel.
- a protective sleeve with a smaller inner diameter should be set on the outside of the drug-loading device and tightly bind the drug-loading device.
- the friction between the drug coating on the surface of the drug-loading device and the inner wall of the protective sleeve not only damages the drug coating but also damages the device body.
- the protective sleeve with a larger inner diameter increases the contour size of the drug-loading device and reduces the passage of the drug-loading device in the lumen of the human body. Moreover, because the protective sleeve with a large inner diameter has a low binding force to the drug-loading device, the binding force to the flap of the DEB is weak, and when the DEB is placed into the human body, the wound flap is high-speed blood. Flow scouring and distraction can also result in a large loss of the drug that was originally covered by the flap; or the DES that was originally crimped on the expandable balloon will be removed before reaching the lesion. Falling or expanding, causing harm to the patient.
- the drug-loading device provided by the invention comprises a device body and a drug coating layer disposed on the surface of the device body.
- the drug carrying device has a contracted state and an expanded state.
- the outer diameter of the drug-loading device in the contracted state is smaller than the outer diameter of the drug-loading device in the expanded state.
- the protective sleeve is sleeved on the outside of the drug carrying device.
- the protective sleeve is made of a polymer material. The protective sleeve can swell in an organic solvent.
- the ratio of the inner diameter of the protective sleeve after the swelling to the inner diameter of the protective sleeve prior to the swelling ranges from (1.1 to 2):1.
- the present invention defines the ratio of the inner diameter of the protective sleeve after the swelling to the inner diameter of the protective sleeve before the swelling as the degree of swelling of the inner diameter of the protective sleeve.
- the swelling degree ranges from (1.1 to 2): 1
- the protective sleeve can be smoothly sleeved to the surface of the instrument body after swelling; and the protective sleeve can be restored to the surface of the instrument body and restored to The inner diameter before swelling and tightly tightens the time required to attach the instrument body.
- the polymeric material is selected from at least one of a silica gel, a polyolefin, a polyurethane, and a polyurethane modified polymer.
- the organic solvent is selected from the group consisting of methanol, ethanol, acetone, chloroform, tetrahydrofuran, dimethyl sulfoxide, or at least one of liquid organic alkanes having a carbon number ranging from 5 to 16.
- the drug coating comprises an active drug.
- the active drug is selected from at least one of an anti-intimal proliferative drug, an anticoagulant drug, an anti-platelet adhesion drug, an anti-infective drug, an antibacterial drug, an anti-inflammatory drug, an anti-allergic drug, or an anti-tumor drug.
- the anti-intimal proliferative drug is selected from at least one of everolimus, rapamycin, paclitaxel, docetaxel, taxol, paclitaxel derivative, probucol or colchicine.
- the anticoagulant drug is selected from at least one of heparin, warfarin sodium or a vitamin K antagonist.
- the anti-platelet adhesion drug is selected from at least one of aspirin, prostaglandin, salvianolic acid, a lipid drug, lysine or dipyridamole.
- the anti-infective drug is selected from at least one of ampicillin, cephalosporin, sulfadiazine or streptomycin sulfate.
- the antibacterial agent is selected from at least one of chitosan and its derivatives, cefoxitin, nalidixic acid or pipemidic acid.
- the anti-tumor drug is selected from at least one of daunorubicin, doxorubicin, carboplatin or a macrolide.
- the active drug is selected from at least one of rapamycin, a rapamycin derivative, paclitaxel, or a paclitaxel derivative.
- the drug coating further comprises a carrier.
- the carrier is selected from small molecules containing polar groups At least one of an organic matter or a high molecular polymer.
- the polar group includes -OH, -SO3H, -NH2, -NHR or -COOH.
- the small molecule organic material is selected from the group consisting of sodium ferulate, L-phenylalanine, benzoate, methionine, valine, lysine, leucine, hydroxypropyl- ⁇ . -cyclodextrin, sorbitol, L-valine, nicotinamide, acetamide, meglumine, L-isoleucine, glucose, maltose, Tween 80, mannitol, lecithin, tryptophan, L - at least one of threonine, salicylic acid, sodium p-aminosalicylate, sodium heparin or vitamin C.
- the high molecular polymer is selected from the group consisting of polyethylene glycol, polylysine, sodium hyaluronate, poloxamer, polyvinylpyrrolidone, polyvinyl alcohol, polyethylene oxide. , polyacrylate, polyacrylamide, polylactic acid, polyglycolic acid, polycaprolactone, polyglycolide, glycolide-lactide copolymer, polydioxanone, polyhydroxyalkanoate, polytrimia At least one of methyl carbonate, polyurethane or polyether urethane.
- the axial length of the protective sleeve prior to swell is greater than or equal to the axial length of the drug delivery device in the collapsed state.
- the inner diameter of the protective sleeve before being swollen is less than or equal to the outer diameter of the drug loading device in the contracted state.
- At least one groove is disposed between the proximal end of the tube of the protective sleeve and the distal end of the tube along the axial direction of the protective sleeve, and the proximal end of the groove and/or The distal end has a slit.
- the length of the slit along the axial direction of the protective sleeve ranges from 5 mm to 15 mm.
- the drug carrying device is an interventional device or an implantable device.
- the interventional device includes a drug balloon catheter, a contrast catheter, a central venous catheter, a pressure catheter, a catheter, or a disposable interventional therapy device probe.
- the implantable device includes a drug eluting stent, a bone nail or a bone plate.
- the invention also provides a method for manufacturing the drug-loading device with a protective sleeve, comprising the following steps:
- the axial length of the protective sleeve prior to swell is greater than or equal to the axial length of the drug delivery device in the collapsed state.
- the inner diameter of the protective sleeve before being swollen is less than or equal to the outer diameter of the drug loading device in the contracted state.
- the method prior to the step of sheathing the swollen protective sleeve over the exterior of the drug-loading device and drying, the method further includes removing the surface of the swollen protective cannula The step of residual organic solvent.
- At least one groove is disposed between the proximal end of the tube of the protective sleeve and the distal end of the tube along the axial direction of the protective sleeve, in which the swollen protective sleeve is removed After the step of residual organic solvent on the surface,
- the method of preparation further includes the step of forming a slit at a proximal end and/or a distal end of the groove.
- the swelling time ranges from 5 minutes to 24 hours.
- the drying comprises air drying at room temperature, air drying, vacuum drying, freeze drying, or heat drying at 30 ° C to 60 ° C.
- the present invention has at least the following beneficial effects:
- the protective sleeve is made of a polymer material which is swellable by a solvent.
- the inner diameter of the protective sleeve is enlarged by solvent swelling, the friction between the protective sleeve and the drug-loading device is reduced, and the drug coating of the drug-loading device is avoided.
- Layer or instrument body In the drug-loading device provided by the present invention, the protective sleeve is made of a polymer material which is swellable by a solvent.
- the protective sleeve is sleeved on the outside of the drug-loading device, as the solvent in the protective sleeve is gradually volatilized, the protective sleeve is gradually contracted and finally restored to the initial inner diameter, thereby achieving Tightly bind the purpose of the drug-loading device.
- the drug-loading device provided by the present invention is restrained by the protective sleeve to a small outer diameter of the contour, which is favorable for the traversability of the drug-loading device in a curved lumen or a narrow lesion in the human body.
- FIG. 1 is a schematic structural view of a drug eluting balloon catheter provided in Embodiment 1, the drug eluting balloon catheter includes a drug eluting balloon body and a protective sleeve;
- Figure 2a is a cross-sectional view of the protective sleeve of Figure 1 taken along line A-A;
- Figure 2b is a cross-sectional view of another embodiment of the protective sleeve of Figure 1 taken along line A-A;
- Example 3 is a schematic structural view of a drug eluting stent provided in Example 4.
- proximal and distal are defined herein as a common term in the field of interventional medicine. Specifically, in the field of interventional medicine, “distal” refers to the end away from the operator during the surgical procedure, and “proximal” refers to the end that is close to the operator during the surgical procedure. Unless otherwise defined, all technical and scientific terms used in the present invention have the same meaning meaning The terminology used in the description is for the purpose of describing the particular embodiments, and is not intended to limit the invention.
- the drug eluting balloon catheter 100 of the first embodiment includes a drug eluting balloon catheter body 10 and a protective sleeve 20.
- the drug eluting balloon catheter body 10 includes a balloon catheter 11 and a drug coating 12.
- Balloon catheter 11 A catheter 111 having opposing proximal and distal ends and an expandable balloon 112 (not filled) disposed at the distal end of the catheter 111 are included.
- the outer surface of the expandable balloon 112 has a drug coating 12.
- the expandable balloon 112 has three wound flaps (not shown) when the expandable balloon 112 is not inflated.
- the proximal developing ring 113 and the distal developing ring 114 are respectively disposed on the outer surface of the tube near the proximal end of the catheter 111 and near the distal end.
- the protective sleeve 20 is made of a polymer material.
- the protective sleeve 20 is sleeved over the exterior of the expandable balloon 112 and limits the deployment of the three wound flaps of the expandable balloon 112.
- the protective sleeve 20 is made of a silicone material.
- the silica gel material can swell in a solvent. Therefore, the protective sleeve 20 is swollen in the solvent and wrapped around the outside of the expandable balloon 112.
- the ratio of the inner diameter of the protective sleeve 20 after swelling to the inner diameter of the protective sleeve 20 before swelling is (1.1 to 2):1.
- the ratio of the inner diameter of the protective sleeve 20 after swelling to the inner diameter of the protective sleeve 20 prior to swelling is defined as the degree of swelling of the inner diameter of the protective sleeve 20.
- the degree of swelling ranges from (1.1 to 2): 1
- the protective sleeve 20 can be smoothly sheathed to the surface of the expandable balloon 112 after swelling; and the protective sleeve 20 can be reduced to the expandable balloon 112. After the surface, it returns to the inner diameter before swelling and tightly binds the time required to expand the balloon 112.
- the ratio of the inner diameter of the protective sleeve 20 after swelling to the inner diameter of the protective sleeve 20 before swelling is 1.3.
- the axial length before the protective sleeve 20 is not swollen is greater than or equal to the axial length of the unfilled expandable balloon 112, which is beneficial for the protective sleeve 20 to be fully wrapped after being swollen and restored to the axial length before unswelling.
- the balloon 112 is expanded and the drug coating 12 is protected.
- the inner diameter of the protective sleeve 20 before being swollen is less than or equal to the outer diameter of the unfilled expandable balloon 112, which facilitates the expansion of the expandable balloon 112 after the protective sleeve 20 is swollen and restored to the outer diameter before the unswollen. Tethered to a smaller profile outer diameter.
- the axial length of the protective sleeve 20 prior to unswelling is greater than the axial length of the unfilled expandable balloon 112.
- the inner diameter of the protective sleeve 20 prior to swell is substantially equal to the outer diameter of the unfilled expandable balloon 112.
- At least one groove is disposed between the proximal end of the tubular body of the protective sleeve 20 and the distal end of the tubular body in the axial direction of the protective sleeve 20.
- the shape of the groove in a section perpendicular to the axial direction of the protective sleeve 20 may be V-shaped (as shown in Fig. 2a), C-shaped (as in Fig. 2b) or other shapes.
- At least one of the proximal end and the distal end of the groove has a slit. The length of the slit along the axial direction of the protective sleeve 20 ranges from 5 mm to 15 mm.
- a first groove (not shown) and a second groove are arranged along the axial direction of the protective sleeve 20 between the proximal end of the protective sleeve 20 and the distal end of the tubular body (Fig. Not shown).
- the first groove and the second groove are symmetrically disposed about a central axis of the protective sleeve 20.
- the proximal end of the first groove has a first slit 21.
- the proximal end of the second groove has a second slit (not shown).
- the length of the first slit 21 along the axial direction of the protective sleeve 20 and the length of the second slit along the axial direction of the protective sleeve 20 are both 10 mm.
- the preparation method of the drug eluting balloon catheter 100 provided in this embodiment is as follows:
- the first step paclitaxel is used as an anti-tissue proliferative active drug, which is mixed with sodium benzoate carrier and dissolved in ethanol to prepare a drug coating solution.
- Plasma pretreatment was performed on a PTA balloon catheter with a balloon size of 4.0 mm x 40 mm. Will The drug coating solution is sprayed onto the expandable balloon surface of the PTA balloon catheter. Dry at room temperature. The expandable balloon is then folded into three wings and wound by a balloon flapping machine to obtain a drug eluting balloon catheter body 10.
- Step 2 Two grooves are engraved along the axial direction of the silicone tube between the proximal end of the tube of the original silicone tube having a diameter of 0.043 inches and the original length of 70 mm and the distal end of the tube, and the two grooves surround The central axis of the silicone tube is symmetrically placed. Then, the silicone tube was swelled in an ethanol solvent for 60 minutes, and the inner diameter of the silicone tube was measured to be 1.3. Remove the swollen silicone tube. The ethanol solvent remaining on the inner and outer surfaces of the silicone tube was dried at room temperature. A slit having an axial length of about 10 mm was cut by a blade at a proximal end of each groove in the axial direction of the silicone tube to obtain a protective sleeve 20 made of a silicone material.
- the third step inserting the expandable balloon 112 of the drug-eluting balloon catheter body 10 obtained by the flap in the first step into the protective sleeve 20 obtained in the second step through the slit of the second step, after which The film was allowed to air dry for 2 hours until the protective sleeve 20 was shrunk to the original size (i.e., the inner diameter was 0.043 inches and the length was 70 mm), packaged, and sterilized to obtain the drug eluting balloon catheter 100 of the present example.
- the drug eluting balloon catheter 100 provided in this embodiment can be connected to the external balloon as long as the operator tears the protective sleeve 20 along the incision of the groove and removes the surface of the expandable balloon 112. Expand the pressure pump and perform a normal balloon dilation.
- the order of the first step and the second step can be interchanged. That is, the protective sleeve 20 is first prepared, and then the drug eluting balloon catheter body 10 is fabricated, and then the expandable balloon 112 of the drug eluting balloon catheter body 10 is inserted into the protective sleeve 20, followed by drying, packaging, and extinction.
- the bacteria can also achieve the object of the present invention.
- the second step includes the step of drying the residual ethanol solvent on the inner and outer surfaces of the silicone tube at normal temperature, and in other embodiments, this step may not be included. That is, in other embodiments, after taking out the swollen silicone tube, the proximal end of the groove of the silicone tube can be directly cut with a blade along the axial direction of the silicone tube, and a slit having an axial length of about 10 mm is also cut. A protective sleeve 20 of silicone material is available.
- the expandable balloon 112 of the drug-eluting balloon catheter body 10 obtained by folding in the first step is inserted into the protective sleeve 20 through the slit, and then dried, packaged, and sterilized, and the invention can also be achieved. the goal of.
- the expandable balloon 112 with the drug coating 12 is located in the protective sleeve 20 without a slit. In the body part.
- the structure of the drug eluting balloon catheter provided in this embodiment is basically the same as that of the drug eluting balloon catheter provided in the first embodiment. The difference is that in the present embodiment, the number of flaps of the expandable balloon is four. Three grooves are provided between the proximal end of the tube of the protective sleeve and the distal end of the tube along the axial direction of the protective sleeve. The distal end of each groove has a slit. The length of the slit along the axial direction of the protective sleeve is 5 mm. And the material of the protective sleeve is different from the material of the protective sleeve of the first embodiment.
- the first step using rapamycin as an anti-tissue proliferative active drug, mixing it with sodium benzoate carrier and polyethylene glycol carrier, and dissolving in methanol to prepare a drug coating solution.
- Plasma pretreatment was performed on a PTA balloon catheter with a balloon size of 5.0 mm x 60 mm.
- the drug coating solution is sprayed onto the expandable balloon surface of the PTA balloon catheter. Dry at room temperature.
- the expandable balloon is then folded into four wings by a balloon folding machine and wound to obtain a drug eluting balloon catheter body.
- Step 2 Three grooves and three recesses are drawn along the axial direction of the polyethylene tube between the proximal end of the polyethylene tube with the original inner diameter of 0.049 inches and the original length of 90 mm and the distal end of the tube body.
- the grooves are symmetrically arranged around the central axis of the polyethylene tube.
- the polyethylene tube was swollen in n-heptane solvent for 24 hours, and the polyethylene tube inner diameter swelling degree was measured to be 2.
- the n-heptane solvent remaining on the inner and outer surfaces of the polyethylene tube was dried at room temperature.
- a slit having an axial length of about 5 mm was cut by a blade at a distal end of each groove in the axial direction of the polyethylene tube to obtain a protective sleeve made of a polyethylene material.
- the third step inserting the expandable balloon of the drug-eluting balloon catheter body obtained by the flap in the first step into the protective sleeve obtained in the second step through the incision of the second step, and ensuring the expandable ball
- the bladder is located in the portion of the body of the protective sleeve that does not have a slit. It was then air dried at 30 ° C for 24 hours until the protective sleeve was shrunk to its original size (ie, an inner diameter of 0.049 inches and a length of 90 mm).
- the drug-eluting balloon catheter of the present example was obtained by packaging and sterilization.
- the structure of the drug eluting balloon catheter provided in this embodiment is basically the same as that of the drug eluting balloon catheter provided in the first embodiment. The difference is that in this embodiment, the number of flaps of the expandable balloon is six.
- a groove is formed between the proximal end of the tube of the protective sleeve and the distal end of the tube along the axial direction of the protective sleeve. Both the proximal end and the distal end of the groove have a slit. The length of the slit along the axial direction of the protective sleeve was 15 mm. And the material of the protective sleeve is different from the material of the protective sleeve of the first embodiment.
- the first step paclitaxel is used as an anti-tissue proliferative active drug, which is mixed with a polyethylene glycol carrier and dissolved in acetone to prepare a drug coating solution.
- Plasma pretreatment was performed on a PTA balloon catheter with a balloon size of 6.0 mm x 80 mm.
- the drug coating solution is brushed onto the expandable balloon surface of the PTA balloon catheter. Dry at room temperature.
- the expandable balloon is then folded into six wings by a balloon folding machine and wound to obtain a drug eluting balloon catheter body.
- the second step a groove is drawn along the axial direction of the silicone tube between the proximal end of the tubular tube of the original inner diameter of 0.053 inches and the original length of 110 mm and the distal end of the tube. Then, the polyurethane tube was swollen in a tetrahydrofuran solvent for 5 minutes, and the inner diameter of the polyurethane tube was measured to be 1.1. Remove the swollen polyurethane tube. The tetrahydrofuran solvent remaining on the inner and outer surfaces of the polyurethane tube was dried at room temperature.
- a slit having an axial length of about 15 mm is cut by a blade at both the proximal end and the distal end of the groove along the axial direction of the polyurethane tube to obtain a protective sleeve made of a polyurethane material.
- the third step the first step of the flap-wrapped drug-eluting balloon catheter body of the expandable balloon through the second The incision of the step is inserted into the protective cannula obtained in the second step and ensures that the expandable balloon is located in the portion of the protective cannula that has no incision. Then, it was vacuum dried at 45 ° C for 5 min until the protective sleeve was shrunk to the original size (ie, the inner diameter was 0.053 inches, the length was 110 mm), packaged, and sterilized to obtain the drug-eluting balloon with the protective sleeve of the present example. catheter.
- the drug eluting stent 300 provided in the fourth embodiment includes a drug eluting stent body 30 and a protective sleeve 40.
- the drug eluting stent body 30 has a contracted state and an expanded state.
- the outer diameter of the drug-eluting stent body 30 in the contracted state is smaller than the outer diameter of the drug-eluting stent body 30 in the expanded state.
- the drug eluting stent body 30 is crimped over the expandable balloon 50 (unfilled) by a crimping machine or other fixture.
- the expandable balloon 50 has three wound flaps (not shown) when the expandable balloon 50 is not inflated.
- the protective sleeve 40 is tightly nested over the exterior of the drug eluting stent body 30 and limits the deployment of the wound flaps of the expandable balloon 50.
- the drug eluting stent body 30 includes a bare stent 31 and a drug coating 32 disposed on the outer surface of the bare stent 31.
- the protective sleeve 40 is made of a silicone material.
- the silica gel material can swell in a solvent. Therefore, the protective sleeve 40 is swollen in the solvent and tightly wrapped around the outside of the drug eluting stent body 30.
- the axial length of the protective sleeve 40 prior to swelling is greater than or equal to the axial length of the drug-eluting stent body 30 in the contracted state, which facilitates protecting the sleeve 40 from completely wrapping the drug-eluting stent body 30 in a contracted state.
- the inner diameter of the protective sleeve 40 before being swollen is less than or equal to the outer diameter of the drug-eluting stent body 30 in the contracted state, which facilitates the protective sleeve 40 to tightly bind the drug-eluting stent body 30 in the contracted state to a smaller contour outer diameter.
- the axial length of the protective sleeve 40 is greater than the axial length of the drug eluting stent body 30 in the contracted state.
- the inner diameter before the protective sleeve 40 is not swollen is equal to the outer diameter of the drug eluting stent body 30 in the contracted state.
- At least one groove is disposed between the proximal end of the tubular body of the protective sleeve 40 and the distal end of the tubular body along the axial direction of the protective sleeve 40, and at least one of the proximal end and the distal end of the recess has a slit.
- the length of the slit along the axial direction of the protective sleeve 40 ranges from 5 mm to 15 mm.
- a first groove (not shown) and a second groove are arranged along the axial direction of the protective sleeve 40 between the proximal end of the protective sleeve 40 and the distal end of the tubular body (Fig. Not shown).
- the first groove and the second groove are axially symmetrical about a central axis of the protective sleeve 40.
- the proximal end of the first groove has a first slit 41.
- the proximal end of the second recess 42 has a second slit (not shown).
- the length of the first slit 41 along the axial direction of the protective sleeve 40 and the length of the second slit along the axial direction of the protective sleeve 40 are both 10 mm.
- the preparation method of the drug eluting stent 300 provided in this embodiment is as follows:
- the first step rapamycin is used as an anti-tissue proliferative active drug, which is mixed with a polylactic acid carrier and dissolved in tetrahydrofuran to prepare a drug coating solution.
- the drug coating solution was dropped on the surface of an iron-based alloy stent having a size of 4.0 mm ⁇ 38 mm, and air-dried at 30 ° C to a constant weight to obtain a drug-eluting stent body 30.
- Plasma balloon pretreatment was then performed on a balloon catheter with a balloon size of 4.0 mm x 40 mm.
- the balloon expandable balloon is folded into three by a balloon folding machine. Wing and winding.
- the drug eluting stent body 30 is crimped to the outside of the expandable balloon 50 using a crimping machine.
- the second step engraving two grooves along the axial direction of the silicone tube between the proximal end of the tube of the original silicone tube having an inner diameter of 0.044 inches and the original length of 70 mm and the distal end of the tube body, and the two grooves surround
- the central axis of the silicone tube is symmetrically placed.
- the silicone tube was swelled in an ethanol solvent for 60 minutes, and the inner diameter of the silicone tube was measured to be 1.4. Remove the swollen silicone tube.
- the ethanol solvent remaining on the inner and outer surfaces of the silicone tube was dried at room temperature.
- a slit having an axial length of about 10 mm was cut by a blade at a proximal end of each groove in the axial direction of the silicone tube to obtain a protective sleeve 40 made of a silicone material.
- the third step inserting the drug-eluting stent body 30 obtained by the first step on the surface of the expandable balloon 50 into the protective sleeve 40 obtained in the second step through the incision of the second step, and ensuring the drug-eluting stent
- the body 30 is located in the body portion of the protective sleeve that does not have a slit. Thereafter, it was air-dried at 60 ° C for 1 hour until the protective sleeve 40 was shrunk to the original size (i.e., the inner diameter was 0.044 inches and the length was 70 mm).
- the drug-eluting stent 300 of the present embodiment is obtained by packaging and sterilization.
- the drug eluting stent 300 provided in this embodiment can be used for ordinary stenting as long as the operator tears the protective sleeve 40 along the incision of the groove and removes the surface of the drug eluting stent body 30. Into the surgery.
- the structure of the drug eluting stent provided in this embodiment is basically the same as that of the drug eluting stent provided in the fourth embodiment.
- the material of the bare stent of the drug eluting stent is different from the material of the bare stent of the drug eluting stent provided in the fourth embodiment.
- a groove is formed between the proximal end of the tube of the protective sleeve and the distal end of the tube along the axial direction of the protective sleeve.
- the distal end of the groove has a slit.
- the length of the slit along the axial direction of the protective sleeve was 15 mm.
- the material of the protective sleeve is different from that of the protective sleeve of the fourth embodiment.
- the first step using everolimus as an anti-tissue proliferative active drug, mixing it with a polycaprolactone carrier and dissolving in ethanol to prepare a drug coating solution.
- the drug coating solution was dispensed onto a surface of a pure iron stent having a size of 5.0 mm ⁇ 58 mm, and air-dried at 30 ° C to a constant weight to obtain a drug-eluting stent body.
- Plasma pretreatment was performed on a balloon catheter having a balloon size of 5.0 mm x 60 mm.
- the expandable balloon of the balloon catheter is then folded into three wings and wound by a balloon flapping machine.
- the drug-eluting stent body is crimped to the outside of the expandable balloon using a crimping machine.
- the second step a groove is formed along the axial direction of the polyethylene tube between the proximal end of the polyethylene tube having a original inner diameter of 0.049 inches and the original length of 70 mm and the distal end of the tube body. Then, the polyethylene tube was swollen in an acetone solvent for 30 minutes, and the polyethylene tube inner diameter swelling degree was measured to be 1.1. Remove the swollen polyethylene tube. The acetone solvent remaining on the inner and outer surfaces of the polyethylene tube was blown dry at normal temperature. A slit having an axial length of about 15 mm was cut by a blade at a distal end of the groove in the axial direction of the polyethylene tube to obtain a protective sleeve made of a polyethylene material.
- the third step the first step of the drug-eluting stent body obtained by crimping the outside of the expandable balloon is cut through the second step.
- the mouth is inserted into the protective cannula obtained in the second step, and it is ensured that the drug eluting stent body is located in the portion of the protective cannula that has no slit. It was then allowed to air dry at room temperature for 24 hours until the protective sleeve was shrunk to its original size (i.e., the inner diameter was 0.049 inches and the length was 70 mm).
- the drug-eluting stent of the present example was obtained by packaging and sterilization.
- the structure of the drug eluting stent provided in this embodiment is basically the same as that of the drug eluting stent provided in the fourth embodiment.
- the difference is that in the embodiment, three grooves are arranged along the axial direction of the protective sleeve between the proximal end of the protective sleeve and the distal end of the tubular body. Both the proximal end and the distal end of the groove have a slit.
- the length of the slit along the axial direction of the protective sleeve is 5 mm.
- the material of the protective sleeve is different from that of the protective sleeve of the fourth embodiment.
- the drug coating solution was brushed on the surface of a pure iron stent having a size of 6.0 mm ⁇ 78 mm, and air-dried at 30 ° C to a constant weight to obtain a drug-eluting stent body.
- Plasma pretreatment was performed on a balloon catheter having a balloon size of 6.0 mm x 80 mm.
- the expandable balloon of the balloon catheter is then folded into three wings and wound by a balloon flapping machine.
- the drug-eluting stent body is crimped to the outside of the expandable balloon using a crimping machine.
- Step 2 Two grooves are formed along the axial direction of the polyurethane tube between the proximal end of the tubular tube of the original inner diameter of 0.053 inches and the original length of 110 mm and the distal end of the tube body, and the two grooves surround The central axis of the polyurethane tube is symmetrically arranged. Then, the polyurethane tube was swelled in a chloroform solvent for 30 minutes, and the inner diameter of the polyurethane tube was measured to be 1.6. Remove the swollen polyurethane tube. The chloroform solvent remaining on the inner and outer surfaces of the polyurethane tube was dried at room temperature. A slit having an axial length of about 10 mm was cut in the axial direction of the silicone tube by a blade to obtain a protective sleeve made of a polyurethane material.
- the third step inserting the drug-eluting stent body obtained by the first step on the outside of the expandable balloon into the protective sleeve obtained in the second step through the incision of the second step, and ensuring that the drug-eluting stent body is protected.
- the protective sleeve was shrunk to its original size (ie, an inner diameter of 0.053 inches and a length of 110 mm).
- the drug-eluting stent of the present example was obtained by packaging and sterilization.
- the structure of the drug-eluting balloon catheter of Comparative Example 1 was substantially the same as that of the drug-eluting balloon catheter provided in Example 1. The difference is that the material of the protective sleeve of the first embodiment is different from the material of the protective sleeve of the first embodiment.
- the preparation method of the drug-eluting balloon catheter of Comparative Example 1 is as follows:
- the first step paclitaxel is used as an anti-tissue proliferative active drug, which is mixed with sodium benzoate carrier and dissolved in ethanol to prepare a drug coating solution.
- Plasma pretreatment was performed on a PTA balloon catheter with a balloon size of 4.0 mm x 40 mm.
- the drug coating solution is sprayed onto the expandable balloon surface of the PTA balloon catheter. Dry at room temperature. Then through the balloon flapping machine The dilatation balloon is folded into three wings and wound to obtain a drug eluting balloon catheter body.
- Step 2 Insert the expandable balloon of the drug-eluting balloon catheter obtained in the first step into a Teflon tube with an inner diameter of 0.043 inches and a length of 70 mm, and find that the proximal end of the expandable balloon is wrinkled. , can not be used normally.
- Step 3 Prepare the drug-eluting balloon catheter body in the same procedure as the first step, and insert the expandable balloon of the drug-eluting balloon catheter body into a PTFE tube with an inner diameter of 0.044 inches and a length of 70 mm. Among them, packaging and sterilization, a drug-eluting balloon catheter of Comparative Example 1 was obtained.
- the structure of the drug eluting balloon catheter of Comparative Example 2 was substantially the same as that of the drug eluting balloon catheter provided in Example 1. The difference is that the material of the protective sleeve of the second embodiment is different from the material of the protective sleeve of the first embodiment.
- the preparation method of the drug eluting balloon catheter of Comparative Example 2 is as follows:
- the first step paclitaxel is used as an anti-tissue proliferative active drug, which is mixed with sodium benzoate carrier and dissolved in ethanol to prepare a drug coating solution.
- Plasma pretreatment was performed on a PTA balloon catheter with a balloon size of 4.0 mm x 40 mm.
- the drug coating solution is sprayed onto the expandable balloon surface of the PTA balloon catheter. Dry at room temperature.
- the expandable balloon is then folded into three wings and wound by a balloon folding machine to obtain a drug eluting balloon catheter body.
- Step 2 The expandable balloon of the drug-eluting balloon catheter body obtained in the first step was inserted into a polyolefin heat-shrinkable tube having a original inner diameter of 2 mm, a length of 140 mm, and a heat shrinkage ratio of 2:1.
- the third step heating the drug-eluting balloon catheter with a polyolefin heat-shrinkable tube at 125 ° C for 90 seconds to heat shrink the polyolefin heat-shrinkable tube, packaging and sterilizing to obtain a drug-eluting balloon catheter of Comparative Example 2 .
- the structure of the drug eluting stent of Comparative Example 3 was substantially the same as that of the drug eluting stent provided in Example 4. The difference is that the material of the protective sleeve of the third embodiment is different from the material of the protective sleeve of the fourth embodiment, and the protective sleeve of the third embodiment does not have the axially disposed groove.
- the preparation method of the drug eluting stent of Comparative Example 3 is as follows:
- the first step rapamycin is used as an anti-tissue proliferative active drug, which is mixed with a polylactic acid carrier and dissolved in tetrahydrofuran to prepare a drug coating solution.
- the drug coating solution was dripped on the surface of an iron-based alloy stent having a size of 4.0 mm ⁇ 38 mm, and air-dried at 30 ° C to a constant weight to obtain a drug-eluting stent body.
- Plasma balloon pretreatment was then performed on a balloon catheter with a balloon size of 4.0 mm x 40 mm.
- the expandable balloon of the balloon catheter is then folded into three wings and wound by a balloon flapping machine.
- the drug-eluting stent body is crimped to the outside of the expandable balloon using a crimping machine.
- Step 2 Insert the body of the drug-eluting stent obtained outside the expandable balloon into the Teflon tube with a original inner diameter of 0.044 inches and a length of 70 mm, and find the drug-eluting stent body.
- An axial offset occurs with the expandable balloon and the axial offset is measured to be approximately 8 mm.
- Step 3 Make the drug-eluting stent body pressed outside the expandable balloon according to the same procedure as the first step, and insert the drug-eluting stent body that is pressed outside the expandable balloon into the inner diameter of 0.045 inches and the length.
- the drug-eluting stent of Comparative Example 3 was obtained by packaging and sterilization.
- the appearance and diameter of the expandable balloon of the drug eluting balloon catheter provided in Example 1 and the expandable balloon of the drug eluting balloon catheter of Comparative Example 2 were measured, respectively.
- the specific method is as follows: the protective sleeve of the expandable balloon surface of the drug eluting balloon catheter provided in Example 1 and the protective sleeve of the expandable balloon surface of the drug eluting balloon catheter of Comparative Example 2 are respectively removed.
- the drug coating on the surface of the expandable balloon is gently wiped off with a dust-free cloth that has been moistened with purified water, and a contrast agent solution stained with crystal violet (eg, iopamiol solution, iohexol solution, iopromide) Solution, iomeprol solution, iodine solution, iodophor solution, iodine solution or iodixanol solution) expands the expandable balloon to nominal pressure (nominal pressure means the balloon catheter reaches the label on the package) The expansion pressure required for the diameter is called).
- a contrast agent solution stained with crystal violet eg, iopamiol solution, iohexol solution, iopromide
- crystal violet e.g, iomeprol solution, iodine solution, iodophor solution, iodine solution or iodixanol solution
- the expanded expandable balloon was placed under a 3D microscope to observe the appearance, and the actual diameter of the expandable balloon was measured at 20 times magnification, which was compared with the nominal diameter of the expandable balloon (nominal diameter refers to the balloon) The nominal diameter on the catheter package).
- nominal diameter refers to the balloon
- the nominal diameter on the catheter package The actual diameter test results of the expandable balloon at nominal pressure are shown in Table 2.
- Example 1 The results in Table 1 indicate that, under nominal pressure, the actual diameter of the expandable balloon of the drug-eluting balloon catheter provided in Example 1 was 4002.2 ⁇ m, in the name of a PTA balloon catheter with a balloon size of 4.0 mm ⁇ 40 mm. The diameter is basically the same.
- the actual diameter of the expandable balloon of the drug-eluting balloon catheter of Comparative Example 2 was 3267.5 ⁇ m, which was much lower than the nominal diameter of a PTA balloon catheter with a balloon size of 4.0 mm x 40 mm.
- the protective sleeve is wrapped around the expandable balloon after swelling, and does not damage the expandable balloon body of the drug eluting balloon catheter, nor Affects the filling and expansion of the expandable balloon after it is placed in the human body.
- the total dose of the drug eluting balloon catheter refers to the total amount of active drug in the drug coating loaded on the surface of the expandable balloon of the drug eluting balloon catheter.
- the drug eluting sphere is generally evaluated by the distribution of the total dose of multiple drug-eluting balloon catheters. The stability of the preparation method of the balloon catheter.
- Example 1 Comparative Example 1 and Comparative Example 2
- three groups of three drug eluting balloon catheter samples (hereinafter referred to as DEB samples) were prepared.
- the drug coating solution applied to the surface of the expandable balloon of the three sets of DEB samples was identical during the preparation.
- the total dose of the three sets of DEB samples was then separately tested to evaluate the effect of the protective sleeve made of different materials on the stability of the preparation process.
- the average total amount of the five samples prepared by the preparation method of Example 1 was 1073.42, which was significantly higher than the average total amount of the five samples prepared by the preparation methods of Comparative Example 1 and Comparative Example 2.
- the DEB sample prepared by the preparation method provided by the present invention has a high total dose because the protective sleeve is swollen and wrapped around the expandable balloon, thereby effectively reducing the expandable sphere of the DEB sample during the production process. Loss of drug coating when the balloon is inserted into the protective cannula.
- the preparation method of the drug eluting balloon provided by the invention has high stability, and the difference in total drug amount between different DEB samples is small, and is more suitable for industrialization.
- the drug-eluting balloon catheter provided in Example 1 and the drug-eluting balloon catheter of Comparative Example 1 were subjected to an in vitro simulation test for drug volume loss during delivery.
- the drug delivery loss of the drug-eluting balloon catheter means that the expandable balloon from the drug-eluting balloon catheter is placed into the guiding catheter, and the expandable balloon is gradually pushed to the target blood vessel of the lesion until it is expandable.
- the amount of drug lost during this period of time before the balloon is filled.
- the ratio of the amount of drug lost during delivery to the initial dose of the expandable balloon surface is the rate of drug loss during delivery. Since the expandable balloon is placed before the guiding catheter, the protective sleeve needs to be removed first, and then the individual closely wound flaps begin to expand outward.
- the protective sleeve with a smaller inner diameter has a stronger binding effect on the flap of the expandable balloon.
- the flap is deployed at a slower speed, and the flap pair that maintains the wound state covers the flap.
- the drug coating has a longer protection time and a lower rate of drug loss during delivery.
- the in vitro simulated test of the dose loss of the delivery process in the in vitro simulated vascular model was performed using the isolated porcine coronary vessels to simulate the target vessel of the human coronary artery system. Investigate the loss of delivery of the drug-eluting balloon catheter.
- the specific method comprises: tearing off the protective sleeves on the drug eluting balloon catheter prepared in the first embodiment and the first comparative example, respectively, and inserting the drug eluting balloon catheter into the in vitro simulated blood vessel model, respectively, and transporting along the simulated blood vessel path to Target the blood vessels and stay.
- the drug-eluting balloon catheter was inserted into the in vitro simulated vascular model and the drug-eluting balloon catheter was removed 90 seconds later.
- the residual drug dose on the surface of the expandable balloon was analyzed by HPLC, and the drug loss rate during the delivery process was calculated as follows:
- Drug loss rate during delivery (initial dose of expandable balloon surface - residual dose of expandable balloon surface) / initial dose of expandable balloon surface x 100%.
- Table 3 The results of the in vitro simulated delivery process dose loss test are shown in Table 3.
- the data in Table 3 shows that the drug loss rate of the drug-eluting balloon catheter provided in the first embodiment is significantly lower than that in the drug-eluting balloon catheter of Comparative Example 1.
- the drug eluting balloon guide provided in the first embodiment is described In the tube, the protective sleeve wrapped around the expandable balloon after swelling can effectively reduce the dose loss of the drug eluting balloon catheter during delivery.
- the contour size of the drug-eluting stent refers to the contour outer diameter of the drug-eluting stent body and the expandable balloon as a whole after the drug-eluting stent body is crimped outside the expandable balloon.
- the contour size of the drug-eluting stent is determined by the tightness of the drug-eluting stent body and the expandable balloon.
- the contour size of the drug-eluting stent is small, which facilitates the smooth passage of the drug-eluting stent through the bending of complex blood vessels and stenotic lesions. It also indicates that the drug-eluting stent body is tightly pressed between the body and the expandable balloon. Therefore, the risk of relative displacement between the drug-eluting stent body and the expandable balloon is small, and the risk of the drug-eluting stent body falling off the surface of the expandable balloon is small.
- Example 4 According to the preparation methods of Example 4 and Comparative Example 3, five sets of drug eluting stent samples (hereinafter referred to as DES samples) of each group were prepared.
- the drug coating solution applied to the surface of the iron-based alloy stent of the two sets of DES samples was identical during the preparation.
- the contour dimensions of the two sets of DES samples were then tested separately. The test results are shown in Table 4:
- the DES sample provided in Example 4 had a smaller profile size than the DES sample of Comparative Example 3, and the profile size data of the five DES samples were more concentrated.
- the protective sleeve wrapped around the DES after swelling can make the outer diameter of the DES sample smaller, fully protect the coating layer and reduce the contour size of the drug stent, and enable the drug-eluting stent body and The expandable balloon has no room for outward expansion.
- the protective sleeve in order to avoid the friction between the drug coating and the inner wall of the protective sleeve to damage the drug coating or to avoid displacement between the drug-eluting stent body and the expandable balloon, only a protective sleeve having a larger inner diameter can be used, resulting in DES.
- the sample has a large outline size. Therefore, the binding force between the drug-eluting stent body and the expandable balloon of Comparative Example 4 is poor, and the risk of the drug-eluting stent body falling off from the outside of the expandable balloon is increased.
- the protective sleeve is made of a polymer material which is swellable by a solvent.
- the protective sleeve made of the polymer material is first swollen in the solvent.
- the inner diameter of the protective sleeve is increased to facilitate insertion of the drug-loading device into the protective sleeve without friction, thereby avoiding damage to the drug coating of the drug-loading device or the device body.
- the solvent is volatilized, so that the protective sleeve shrinks to the initial inner diameter without external force such as mechanical force and heat source, and the drug-loading device is restrained to a small outer diameter of the contour, which facilitates the smooth passage of the drug-loading device through the inside of the human body.
- the present invention facilitates the operator to directly tear off the protective sleeve prior to use by providing at least one groove in the axial direction of the protective sleeve between the proximal end of the tubular body of the protective sleeve and the distal end of the tubular body.
- the drug eluting balloon catheter provided by the present invention can not only bind the expandable balloon of the drug eluting balloon catheter to the smaller outer contour through the protective sleeve, but also avoid the between the protective sleeve and the drug coating. Friction causes damage to the drug coating or the expandable balloon body. Without the need for heat, the expandable balloon is tightly restrained by the protective sleeve to a smaller size without causing thermal degradation of the drug in the drug coating or thermal deformation of the expandable balloon body. And after the protective sleeve is removed from the exterior of the expandable balloon, the plurality of flaps of the expandable balloon can continue to be tightly wound, reducing drug loss caused by high-speed flushing of blood flow during transport.
- the drug eluting stent provided by the invention can not only bind the drug eluting stent body to a small outer contour through a protective sleeve, but also avoid the friction between the protective sleeve and the drug coating to cause the drug coating, or Displacement between the drug eluting stent body and the expandable balloon.
- the drug-eluting stent body and the expandable balloon are tightly bound by the protective sleeve to a smaller size without heating, without causing thermal degradation of the drug in the drug coating or the drug-eluting stent body and the expandable balloon. Deformed by heat.
- the above technical solutions provided by the present invention are only schematically described by the drug eluting balloon catheter and the drug eluting stent.
- the technical solution provided by the present invention can also be applied to other interventional medical devices or implantable medical treatments.
- the interventional instrument includes a contrast catheter, a central venous catheter, a pressure catheter, a catheter, or a disposable interventional therapy device probe.
- the implantable device includes a bone nail or a bone plate.
- the protective sleeve is made of a polymer material swellable by the solvent, and the protective sleeve is first swelled in the solvent, and then placed outside the interventional medical device or the implantable medical device, and then the solvent is volatilized, that is, The object of the invention can be achieved.
- the above technical solutions provided by the present invention are only schematically described by the drug-loading device, and the technical solution provided by the present invention can also be applied to other non-medicated devices.
- the protective sleeve provided by the present invention still has the technical effect of protecting the device body from damage, and can tightly bind the non-medicated device to a small size.
- the outer diameter of the contour increases the traversability of the non-medicated device in the curved or stenotic portion of the human body.
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Abstract
一种载药器械及其制备方法,该载药器械包括器械本体(10)及设于器械本体(10)表面的药物涂层(12)。载药器械具有收缩状态及扩张状态,且载药器械在收缩状态时的外径较载药器械在扩张状态时的外径小。保护套管(20)套设于载药器械的外部。保护套管(20)由高分子材料制成,保护套管(20)可在有机溶剂中发生溶胀。制备时,保护套管(20)先在溶剂中溶胀至较大的内径,再套设于载药器械的表面,之后随着有机溶剂挥发,保护套管(20)收缩至原始尺寸,紧紧包裹于载药器械的外部。因此可降低保护套管(20)内壁与载药器械的药物涂层(12)之间的摩擦力,避免损伤药物涂层(12)或器械本体(10),并且可将载药器械束缚至较小的轮廓外径,提高载药器械在弯曲的人体管腔或狭窄病变部位的可通过性。
Description
本发明属于医疗器械领域,涉及载药器械及其制备方法。
腔内介入治疗相对于传统开放手术治疗具有创伤小、恢复快、并发症发生率低、疗效高等优点,逐渐成为血管外科医生治疗血管类病变的首选方式。
药物洗脱球囊(Drug Eluting Balloon,简称:DEB)属于腔内介入治疗方法之一,其原理是:将活性药物涂布于可扩张球囊表面,将可扩张球囊输送至人体病变部位后充压扩张,使得活性药物释放至血管壁并发挥药效。在DEB的生产过程中,需要将已涂布药物的可扩张球囊折翼并卷绕后套入保护套管中。
药物洗脱支架(Drug Eluting Stent,简称:DES)也属于一种微创手术治疗方法,其原理是在裸支架表面涂布药物涂层,再将DES输送至人体病变部位并扩张,药物自涂层之中缓慢释放,持续发挥药效。DES在到达病变部位后,通常需要普通的可扩张球囊辅助扩张。因此,在DES的生产过程中,需要将DES压握到已折翼并卷绕的可扩张球囊外部,再将压握好的可扩张球囊和DES共同套入保护套管中。
对于上述的载药式器械,保护套管具有保护药物涂层的作用,能避免药物涂层在生产、运输过程中遭到破坏。同时,保护套管可以将载药器械束缚至较小的外径尺寸,利于载药器械顺利通过迂曲的人体血管。
实际生产过程中,为了减小载药器械的轮廓尺寸,应选用内径较小的保护套管套设在载药器械的外部并紧紧束缚载药器械。但是,在将保护套管套设至载药器械外部的过程中,载药器械表面的药物涂层与保护套管内壁之间的摩擦不仅会破坏药物涂层,还会损伤器械本体。例如,导致可扩张球囊发生褶皱并损坏可扩张球囊本体,进而降低DEB的有效性;或者造成DES与可扩张球囊发生相对移位,进而影响DES在病变部位的定位和扩张,降低DES的安全性。
而内径较大的保护套管则会增大载药器械的轮廓尺寸,降低载药器械在人体管腔的通过性。并且,由于内径较大的保护套管对载药器械的约束力较低,会导致其对DEB的折翼的束缚力较弱,当DEB被置入人体,卷绕的折翼被高速的血流冲刷散开,也会导致原本被折翼覆盖的药物大量损失;或者导致原来压握在可扩张球囊上的DES在到达病变位置前脱
落或者扩张,对病人造成伤害。
发明内容
基于此,有必要提供一种载药器械,带有尺寸适宜的保护套管,该保护套管不仅可以将载药器械束缚至较小的外部轮廓,还能避免保护套管与药物涂层之间的摩擦力损伤药物涂层或者器械本体。
本发明提供的载药器械,包括器械本体及设于所述器械本体表面的药物涂层。所述载药器械具有收缩状态及扩张状态。所述载药器械在所述收缩状态时的外径较所述载药器械在所述扩张状态时的外径小。所述保护套管套设于所述载药器械的外部。所述保护套管由高分子材料制成。所述保护套管可在有机溶剂中发生溶胀。
在其中一个实施例中,所述保护套管在所述溶胀后的内径与所述保护套管在所述溶胀前的内径之比范围为(1.1~2):1。本发明将所述保护套管在所述溶胀后的内径与所述保护套管在所述溶胀前的内径之比定义为所述保护套管的内径的溶胀度。溶胀度范围为(1.1~2):1时,所述保护套管在溶胀后可以顺利地套设至器械本体的表面;并且可以减少保护套管在套设至器械本体的表面后,恢复至溶胀前的内径并紧紧束缚器械本体所需的时间。
在其中一个实施例中,所述高分子材料选自硅胶、聚烯烃、聚氨酯及聚氨酯改性聚合物中的至少一种。
在其中一个实施例中,所述有机溶剂选自甲醇、乙醇、丙酮、氯仿、四氢呋喃、二甲基亚砜或者碳原子个数范围为5个至16个的液态有机烷烃中的至少一种。
在其中一个实施例中,所述药物涂层包括活性药物。所述活性药物选自抗内膜增生药物、抗凝血药物、抗血小板粘附药物、抗感染药物、抗菌药物、抗炎症反应药物、抗过敏药物或者抗肿瘤药物中的至少一种。
在其中一个实施例中,所述抗内膜增生药物选自依维莫司、雷帕霉素、紫杉醇、多西紫杉醇、紫杉酚、紫杉醇衍生物、普罗布考或者秋水仙碱中的至少一种。所述抗凝血药物选自肝素、华法林钠或者维生素K拮抗剂中的至少一种。所述抗血小板粘附药物选自阿司匹林、前列腺素、丹酚酸、硝酸脂类药物、赖氨匹林或者潘生丁中的至少一种。所述抗感染药物选自氨苄青霉素、头孢霉素、磺胺嘧啶或者硫酸链霉素中的至少一种。所述抗菌药物选自壳聚糖及其衍生物、头孢西丁、萘啶酸或者吡哌酸中的至少一种。所述抗肿瘤药物选自柔红霉素、阿霉素、卡铂或者大环内酯类中的至少一种。
在其中一个实施例中,所述活性药物选自雷帕霉素、雷帕霉素衍生物、紫杉醇或者紫杉醇衍生物中的至少一种。
在其中一个实施例中,所述药物涂层还包括载体。所述载体选自含极性基团的小分子有
机物或者高分子聚合物中的至少一种。所述极性基团包括-OH、-SO3H、-NH2、-NHR或者-COOH。
在其中一个实施例中,所述小分子有机物选自阿魏酸钠、L-苯丙氨酸、苯甲酸盐、蛋氨酸、脯氨酸、赖氨酸、亮氨酸、羟丙基-β-环糊精、山梨醇、L-缬氨酸、烟酰胺、乙酰胺、葡甲胺、L-异亮氨酸、葡萄糖、麦芽糖、吐温80、甘露醇、卵磷脂、色氨酸、L-苏氨酸、水杨酸、对氨基水杨酸钠、肝素钠或者维生素C中的至少一种。
在其中一个实施例中,所述高分子聚合物选自聚乙二醇、聚赖氨酸、透明质酸钠、泊洛沙姆、聚乙烯基吡罗烷酮、聚乙烯醇、聚氧化乙烯、聚丙烯酸酯、聚丙烯酰胺、聚乳酸、聚乙醇酸、聚己内酯、聚乙交酯、乙交酯-丙交酯共聚物、聚二恶烷酮、聚羟基脂肪酸酯、聚三亚甲基碳酸酯、聚氨酯或者聚醚氨酯中的至少一种。
在其中一个实施例中,所述保护套管未溶胀前的轴向长度大于或者等于所述载药器械在所述收缩状态时的轴向长度。所述保护套管未溶胀前的内径小于或者等于所述载药器械在所述收缩状态时的外径。
在其中一个实施例中,所述保护套管的管体近端及管体远端之间沿所述保护套管的轴向设置至少一个凹槽,且所述凹槽的近端和/或远端具有切口。
在其中一个实施例中,所述切口沿所述保护套管的轴向的长度范围为5毫米至15毫米。
在其中一个实施例中,所述载药器械为介入式器械或者植入式器械。所述介入式器械包括药物球囊导管、造影导管、中心静脉导管、测压导管、导尿管或者一次性介入治疗仪探头。所述植入式器械包括药物洗脱支架、骨钉或者骨板。
本发明还提供所述带保护套管的载药器械的制作方法,包括以下步骤:
将所述药物涂层施加在所述器械本体表面,得到所述载药器械;将所述保护套管置于所述有机溶剂中使所述保护套管溶胀,得到溶胀的保护套管;将所述溶胀的保护套管套设于所述载药器械的外部并干燥,得到所述的载药器械。
在其中一个实施例中,所述保护套管未溶胀前的轴向长度大于或者等于所述载药器械在所述收缩状态时的轴向长度。所述保护套管未溶胀前的内径小于或者等于所述载药器械在所述收缩状态时的外径。
在其中一个实施例中,在所述将所述溶胀的保护套管套设于所述载药器械的外部并干燥的步骤之前,所述制备方法还包括去除所述溶胀的保护套管表面的残留的有机溶剂的步骤。
在其中一个实施例中,所述保护套管的管体近端及管体远端之间沿所述保护套管的轴向设置至少一个凹槽,在所述去除所述溶胀的保护套管表面的残留的有机溶剂的步骤之后,
所述制备方法还包括在所述凹槽的近端和/或远端形成切口的步骤。
在其中一个实施例中,所述溶胀的时间范围为5分钟至24小时。
在其中一个实施例中,所述干燥包括常温晾干、鼓风干燥、真空干燥、冷冻干燥,或者于30℃至60℃加热干燥。
与现有技术相比较,本发明至少具有以下有益效果:
(1)本发明提供的载药器械中,保护套管由可被溶剂溶胀的高分子材料制成。在将保护套管套设于载药器械外部的过程中,先通过溶剂溶胀使保护套管内径变大,降低保护套管与载药器械之间的摩擦力,避免损伤载药器械的药物涂层或者器械本体.
(2)本发明提供的载药器械中,在保护套管套设于载药器械外部之后,随着保护套管中的溶剂逐渐挥发,保护套管逐渐收缩并最终恢复至初始内径,从而达到紧紧束缚载药器械的目的。
(3)本发明提供的载药器械被保护套管束缚至较小的轮廓外径,有利于载药器械在人体内部的弯曲管腔或者狭窄病变部位的可通过性。
附图与附图说明
图1为实施例一提供的药物洗脱球囊导管的结构示意图,药物洗脱球囊导管包括药物洗脱球囊本体及保护套管;
图2a为图1中的保护套管沿A-A线的剖视图;
图2b为图1中的保护套管的另一种实施方式沿A-A线的剖视图;
图3为实施例四提供的药物洗脱支架的结构示意图。
为了使本发明的目的、技术方案及优点更加清楚明白,以下结合附图及实施例,对本发明进行进一步详细说明。应当理解,此处所描述的具体实施例仅仅用以解释本发明,并不用于限定本发明。
为了更加清楚地描述球囊导管及血管支架的结构,此处限定术语“近端”及“远端”为介入医疗领域惯用术语。具体而言,在介入医疗领域,“远端”表示手术操作过程中远离操作人员的一端,“近端”表示手术操作过程中靠近操作人员的一端。除非另有定义,本发明所使用的所有的技术和科学术语与属于本发明的技术领域的技术人员通常理解的含义相同。本发明在说明书中所使用的术语只是为了描述具体的实施例的目的,不是旨在于限制本发明。
实施例一
请参见图1,实施例一提供的药物洗脱球囊导管100,包括药物洗脱球囊导管本体10及保护套管20。药物洗脱球囊导管本体10包括球囊导管11及药物涂层12。球囊导管11
包括具有相对的近端及远端的导管111及设于导管111远端的可扩张球囊112(未充盈)。可扩张球囊112的外表面具有药物涂层12。在可扩张球囊112没有充压膨胀时,可扩张球囊112具有三个卷绕的折翼(图未示出)。近端显影环113及远端显影环114分别设于导管111靠近近端及靠近远端的管体外表面上。
保护套管20由高分子材料制成。保护套管20套设于可扩张球囊112的外部并限制可扩张球囊112的三个卷绕的折翼展开。保护套管20由硅胶材料制成。该硅胶材料可以在溶剂中溶胀。故,保护套管20在溶剂中溶胀后包裹在可扩张球囊112的外部。保护套管20在溶胀后的内径与保护套管20在溶胀前的内径之比范围为(1.1~2):1。保护套管20在溶胀后的内径与保护套管20在溶胀前的内径之比定义为保护套管20的内径的溶胀度。溶胀度范围为(1.1~2):1时,保护套管20在溶胀后可以顺利地套设至可扩张球囊112的表面;并且可以减少保护套管20在套设至可扩张球囊112的表面后,恢复至溶胀前的内径并紧紧束缚可扩张球囊112所需的时间。具体地,本实施例中,保护套管20在溶胀后的内径与保护套管20在溶胀前的内径之比为1.3。
保护套管20未溶胀前的轴向长度大于或者等于未充盈的可扩张球囊112的轴向长度,利于保护套管20经过溶胀再恢复至未溶胀前的轴向长度之后,可以完全包裹可扩张球囊112并保护药物涂层12。保护套管20未溶胀前的内径小于或者等于未充盈的可扩张球囊112的外径,利于保护套管20经过溶胀再恢复至未溶胀前的外径之后,可以将可扩张球囊112紧密束缚至较小的轮廓外径。优选地,本实施例中,保护套管20未溶胀前的轴向长度大于未充盈的可扩张球囊112的轴向长度。保护套管20未溶胀前的内径大致等于未充盈的可扩张球囊112的外径。
保护套管20的管体近端及管体远端之间沿保护套管20的轴向设置至少一个凹槽。凹槽在垂直于保护套管20的轴向的截面的形状可以为V形(如图2a)、C形(如图2b)或者其他形状。凹槽的近端及远端之中的至少一端具有切口。切口沿保护套管20的轴向的长度范围为5毫米至15毫米。优选地,本实施例中,保护套管20的管体近端及管体远端之间沿保护套管20的轴向设置第一凹槽(图未示出)及第二凹槽(图未示出)。第一凹槽及第二凹槽围绕保护套管20的中心轴呈对称设置。第一凹槽的近端具有第一切口21。第二凹槽的近端具有第二切口(图未示出)。第一切口21沿保护套管20的轴向的长度及第二切口沿保护套管20的轴向的长度均为10毫米。
本实施例提供的药物洗脱球囊导管100的制备方法如下:
第一步:以紫杉醇作为抗组织增生活性药物,将其与苯甲酸钠载体混合后溶于乙醇中配制药物涂层溶液。对球囊规格为4.0毫米×40毫米的PTA球囊导管进行等离子预处理。将
药物涂层溶液喷涂至PTA球囊导管的可扩张球囊表面。常温晾干。再通过球囊折翼机将可扩张球囊折为三个翼并卷绕,得到药物洗脱球囊导管本体10。
第二步:在原始内径为0.043英寸、原始长度为70毫米的硅胶管的管体近端及管体远端之间沿硅胶管的轴向刻出两个凹槽,且两个凹槽围绕硅胶管的中心轴呈对称设置。然后将硅胶管置于乙醇溶剂中溶胀60分钟,测得硅胶管内径溶胀度为1.3。取出已经溶胀的硅胶管。将硅胶管内、外表面残留的乙醇溶剂常温吹干。用刀片将每个的凹槽的近端沿硅胶管的轴向切开一个轴向长度约为10毫米的切口,得到硅胶材料制成的保护套管20。
第三步:将第一步得到的折翼卷绕后的药物洗脱球囊导管本体10的可扩张球囊112经由第二步的切口插入第二步得到的保护套管20之中,之后常温晾干2小时,直至保护套管20收缩至原始尺寸(即,内径为0.043英寸、长度为70毫米),包装、灭菌,得到本实施例的药物洗脱球囊导管100。
本实施例提供的药物洗脱球囊导管100,在使用时,只要操作者沿着凹槽的切口将保护套管20撕开并自可扩张球囊112的表面去除,即可连接外部球囊扩张压力泵,行普通的球囊扩张术。
可以理解的是,本实施例提供的制备方法中,第一步和第二步的前后顺序可以互换。即,先制作保护套管20,再制作药物洗脱球囊导管本体10,后将药物洗脱球囊导管本体10的可扩张球囊112插入保护套管20之中,之后干燥、包装、灭菌,也可达到本发明的目的。
可以理解的是,本实施例提供的制备方法中,第二步包括将硅胶管内、外表面残留的乙醇溶剂常温吹干的步骤,在其他实施例中,也可以不包括此步骤。即,在其他实施例中,在取出已经溶胀的硅胶管之后,可以直接用刀片将硅胶管的凹槽的近端沿硅胶管的轴向切开一个轴向长度约为10毫米的切口,也可得到硅胶材料的保护套管20。然后将第一步得到的折翼卷绕后的药物洗脱球囊导管本体10的可扩张球囊112经由切口插入保护套管20之中,之后干燥、包装、灭菌,也可达到本发明的目的。
可以理解的是,为避免影响药物洗脱球囊导管100的有效性,本实施例提供的制备方法中,带有药物涂层12的可扩张球囊112位于保护套管20的不具有切口的管体部分之中。
实施例二
本实施例提供的药物洗脱球囊导管的结构与实施例一提供的药物洗脱球囊导管的结构基本相同。区别之处在于,本实施例中,可扩张球囊的折翼数量为四个。保护套管的管体近端及管体远端之间沿保护套管的轴向设置三个凹槽。每个凹槽的远端具有切口。切口沿保护套管的轴向的长度为5毫米。并且保护套管的材料与实施例一的保护套管的材料不同。
本实施例提供的药物洗脱球囊导管的制备方法如下:
第一步:以雷帕霉素作为抗组织增生活性药物,将其与苯甲酸钠载体及聚乙二醇载体混合后溶于甲醇中配制药物涂层溶液。对球囊规格为5.0毫米×60毫米的PTA球囊导管进行等离子预处理。将药物涂层溶液喷涂至PTA球囊导管的可扩张球囊表面。常温晾干。再通过球囊折翼机将可扩张球囊折为四个翼并卷绕,得到药物洗脱球囊导管本体。
第二步:将原始内径为0.049英寸、原始长度为90毫米的聚乙烯管的管体近端及管体远端之间沿聚乙烯管的轴向刻出三个凹槽,且三个凹槽围绕聚乙烯管的中心轴呈对称设置。然后将聚乙烯管置于正庚烷溶剂中溶胀24小时,测得聚乙烯管内径溶胀度为2。取出已经溶胀的聚乙烯管。将聚乙烯管内、外表面残留的正庚烷溶剂常温吹干。用刀片将每个凹槽的远端沿聚乙烯管的轴向切开一个轴向长度约为5毫米的切口,得到聚乙烯材料制成的保护套管。
第三步:将第一步得到的折翼卷绕后的药物洗脱球囊导管本体的可扩张球囊经由第二步的切口插入第二步得到的保护套管中,并确保可扩张球囊位于保护套管的不具有切口的管体部分之中。之后于30℃鼓风干燥24小时,直至保护套管收缩至原始尺寸(即,内径为0.049英寸、长度为90毫米)。包装、灭菌,得到本实施例的药物洗脱球囊导管。
实施例三
本实施例提供的药物洗脱球囊导管的结构与实施例一提供的药物洗脱球囊导管的结构基本相同。区别之处在于,本实施例中,可扩张球囊的折翼数量为六个。保护套管的管体近端及管体远端之间沿保护套管的轴向设置一个凹槽。凹槽的近端及远端均具有切口。切口沿保护套管的轴向的长度为15毫米。并且保护套管的材料与实施例一的保护套管的材料不同。
本实施例提供的药物洗脱球囊导管的制备方法如下:
第一步:以紫杉醇作为抗组织增生活性药物,将其与聚乙二醇载体混合后溶于丙酮中配制药物涂层溶液。对球囊规格为6.0毫米×80毫米的PTA球囊导管进行等离子预处理。将药物涂层溶液刷涂至PTA球囊导管的可扩张球囊表面。常温晾干。再通过球囊折翼机将可扩张球囊折为六个翼并卷绕,得到药物洗脱球囊导管本体。
第二步:在原始内径为0.053英寸、原始长度为110毫米的聚氨酯管的管体近端及管体远端之间沿硅胶管的轴向刻出一个凹槽。然后将聚氨酯管置于四氢呋喃溶剂中溶胀5分钟,测得聚氨酯管内径溶胀度为1.1。取出已经溶胀的聚氨酯管。将聚氨酯管内外表面残留的四氢呋喃溶剂常温吹干。用刀片将凹槽的近端及远端均沿聚氨酯管的轴向切开一个轴向长度约为15毫米的切口,得到聚氨酯材料制成的保护套管。
第三步:将第一步得到的折翼卷绕后的药物洗脱球囊导管本体的可扩张球囊经由第二
步的切口插入第二步得到的保护套管中,并确保可扩张球囊位于保护套管的不具有切口的管体部分之中。之后于45℃真空干燥5min,直至保护套管收缩至原始尺寸(即,内径为0.053英寸、长度为110毫米),包装、灭菌,得到本实施例的带保护套管的药物洗脱球囊导管。
实施例四
请参见图3,实施例四提供的药物洗脱支架300,包括药物洗脱支架本体30及保护套管40。药物洗脱支架本体30具有收缩状态及扩张状态。药物洗脱支架本体30在收缩状态时的外径较药物洗脱支架本体30在扩张状态时的外径小。药物洗脱支架本体30通过压握机或者其他工装夹具压握在可扩张球囊50(未充盈)外部。在可扩张球囊50没有充压膨胀时,可扩张球囊50具有三个卷绕的折翼(图未示出)。保护套管40紧密套设于药物洗脱支架本体30的外部,并限制可扩张球囊50的卷绕的折翼展开。
药物洗脱支架本体30包括裸支架31及设于裸支架31外表面的药物涂层32。
保护套管40由硅胶材料制成。该硅胶材料可在溶剂中发生溶胀。故,保护套管40在溶剂中溶胀后紧密包裹在药物洗脱支架本体30的外部。保护套管40在溶胀前的轴向长度大于或者等于药物洗脱支架本体30在收缩状态时的轴向长度,利于保护套管40完全包裹收缩状态的药物洗脱支架本体30。保护套管40未溶胀前的内径小于或者等于药物洗脱支架本体30在收缩状态时的外径,利于保护套管40将收缩状态的药物洗脱支架本体30紧密束缚至较小的轮廓外径。优选地,在本实施例中,保护套管40的轴向长度大于药物洗脱支架本体30在收缩状态时的轴向长度。保护套管40未溶胀前的内径等于药物洗脱支架本体30在收缩状态时的外径。
保护套管40的管体近端及管体远端之间沿保护套管40的轴向设置至少一个凹槽,且凹槽的近端及远端之中的至少一端具有切口。切口沿保护套管40的轴向的长度范围为5毫米至15毫米。优选地,本实施例中,保护套管40的管体近端及管体远端之间沿保护套管40的轴向设置第一凹槽(图未示出)及第二凹槽(图未示出)。第一凹槽及第二凹槽围绕保护套管40的中心轴呈轴向对称。第一凹槽的近端具有第一切口41。第二凹槽42的近端具有第二切口(图未示出)。第一切口41沿保护套管40的轴向的长度及第二切口沿保护套管40的轴向的长度均为10毫米。
本实施例提供的药物洗脱支架300的制备方法如下:
第一步:以雷帕霉素作为抗组织增生活性药物,将其与聚乳酸载体混合后溶于四氢呋喃中配制药物涂层溶液。将药物涂层溶液滴涂在规格为4.0毫米×38毫米的铁基合金支架表面,于30℃鼓风干燥至恒重,得到药物洗脱支架本体30。然后对球囊规格为4.0毫米×40毫米的球囊导管进行等离子预处理。再通过球囊折翼机将球囊导管的可扩张球囊折为三个
翼并卷绕。采用压握机将药物洗脱支架本体30压握在可扩张球囊50的外部。
第二步:将原始内径为0.044英寸、原始长度为70毫米的硅胶管的管体近端及管体远端之间沿硅胶管的轴向刻出两个凹槽,且两个凹槽围绕硅胶管的中心轴呈对称设置。然后将硅胶管置于乙醇溶剂中溶胀60分钟,测得硅胶管内径溶胀度为1.4。取出已经溶胀的硅胶管。将硅胶管内、外表面残留的乙醇溶剂常温吹干。用刀片将每个凹槽的近端沿硅胶管的轴向切开一个轴向长度约为10毫米的切口,得到硅胶材料制成的保护套管40。
第三步:将第一步得到的压握在可扩张球囊50表面的药物洗脱支架本体30经由第二步的切口插入第二步得到的保护套管40中,并确保药物洗脱支架本体30位于保护套管的不具有切口的管体部分之中。之后于60℃鼓风干燥1小时,直至保护套管40收缩至原始尺寸(即,内径为0.044英寸、长度为70毫米)。包装、灭菌,得到本实施例的药物洗脱支架300。
本实施例提供的药物洗脱支架300,在使用时,只要操作者沿着凹槽的切口将保护套管40撕开并自药物洗脱支架本体30的表面去除,即可进行普通的支架植入术。
实施例五
本实施例提供的药物洗脱支架的结构与实施例四提供的药物洗脱支架的结构基本相同。区别之处在于,本实施例中,药物洗脱支架的裸支架的材料与实施例四提供的药物洗脱支架的裸支架的材料不同。保护套管的管体近端及管体远端之间沿保护套管的轴向设置一个凹槽。凹槽的远端具有切口。切口沿保护套管的轴向的长度为15毫米。并且保护套管的材料与实施例四的保护套管的材料不同。
本实施例提供的药物洗脱支架的制备方法如下:
第一步:以依维莫司作为抗组织增生活性药物,将其与聚己内酯载体混合后溶于乙醇中配制药物涂层溶液。将药物涂层溶液滴涂在规格为5.0毫米×58毫米的纯铁支架表面,于30℃鼓风干燥至恒重,得到药物洗脱支架本体。对球囊规格为5.0毫米×60毫米的球囊导管进行等离子预处理。再通过球囊折翼机将球囊导管的可扩张球囊折为三个翼并卷绕。采用压握机将药物洗脱支架本体压握在可扩张球囊的外部。
第二步:将原始内径为0.049英寸、原始长度为70毫米的聚乙烯管的管体近端及管体远端之间沿聚乙烯管的轴向刻出一个凹槽。然后将聚乙烯管置于丙酮溶剂中溶胀30分钟,测得聚乙烯管内径溶胀度为1.1。取出已经溶胀的聚乙烯管。将聚乙烯管内、外表面残留的丙酮溶剂常温吹干。用刀片将凹槽的远端沿聚乙烯管的轴向切开一个轴向长度约为15毫米的切口,得到聚乙烯材料制成的保护套管。
第三步:将第一步得到的压握在可扩张球囊外部的药物洗脱支架本体经由第二步的切
口插入第二步得到的保护套管中,并确保药物洗脱支架本体位于保护套管的不具有切口的管体部分之中。之后于常温晾干24小时,直至保护套管收缩至原始尺寸(即,内径为0.049英寸、长度为70毫米)。包装、灭菌,得到本实施例的药物洗脱支架。
实施例六
本实施例提供的药物洗脱支架的结构与实施例四提供的药物洗脱支架的结构基本相同。区别之处在于,本实施例中,保护套管的管体近端及管体远端之间沿保护套管的轴向设置三个凹槽。凹槽的近端及远端均具有切口。切口沿保护套管的轴向的长度为5毫米。并且保护套管的材料与实施例四的保护套管的材料不同。
本实施例提供的药物洗脱支架的制备方法如下:
第一步:以紫杉醇作为抗组织增生活性药物,将其与烟酰胺载体混合后溶于丙酮中配制药物涂层溶液。将药物涂层溶液刷涂在规格为6.0毫米×78毫米的纯铁支架表面,于30℃鼓风干燥至恒重,得到药物洗脱支架本体。对球囊规格为6.0毫米×80毫米的球囊导管进行等离子预处理。再通过球囊折翼机将球囊导管的可扩张球囊折为三个翼并卷绕。采用压握机将药物洗脱支架本体压握在可扩张球囊的外部。
第二步:将原始内径为0.053英寸、原始长度为110毫米的聚氨酯管的管体近端及管体远端之间沿聚氨酯管的轴向刻出两个凹槽,且两个凹槽围绕聚氨酯管的中心轴呈对称设置。然后将聚氨酯管置于氯仿溶剂中溶胀30分钟,测得聚氨酯管内径溶胀度为1.6。取出已经溶胀的聚氨酯管。将聚氨酯管内、外表面残留的氯仿溶剂常温吹干。用刀片将每个凹槽的近端及远端均沿硅胶管的轴向切开一个轴向长度约为10毫米的切口,得到聚氨酯材料制成的保护套管。
第三步:将第一步得到的压握在可扩张球囊外部的药物洗脱支架本体经由第二步的切口插入第二步得到的保护套管中,并确保药物洗脱支架本体位于保护套管的不具有切口的管体部分之中。之后于60℃加热12小时,直至保护套管收缩至原始尺寸(即,内径为0.053英寸、长度为110毫米)。包装、灭菌,得到本实施例的药物洗脱支架。
对比例一
对比例一的药物洗脱球囊导管的结构与实施例一提供的药物洗脱球囊导管的结构基本相同。区别之处在于,对比例一的保护套管的材料与实施例一的保护套管的材料不同。
对比例一的药物洗脱球囊导管的制备方法如下:
第一步:以紫杉醇作为抗组织增生活性药物,将其与苯甲酸钠载体混合后溶于乙醇中配制药物涂层溶液。对球囊规格为4.0毫米×40毫米的PTA球囊导管进行等离子预处理。将药物涂层溶液喷涂至PTA球囊导管的可扩张球囊表面。常温晾干。再通过球囊折翼机将可
扩张球囊折为三个翼并卷绕,得到药物洗脱球囊导管本体。
第二步:将第一步得到的药物洗脱球囊导管本体的可扩张球囊插入内径为0.043英寸、长度为70毫米的聚四氟乙烯管中,发现可扩张球囊近端产生褶皱现象,无法正常使用。
第三步:按照第一步相同的步骤制作药物洗脱球囊导管本体,并将药物洗脱球囊导管本体的可扩张球囊插入内径为0.044英寸、长度为70毫米的聚四氟乙烯管之中,包装、灭菌,得到对比例一的药物洗脱球囊导管。
对比例二
对比例二的药物洗脱球囊导管的结构与实施例一提供的药物洗脱球囊导管的结构基本相同。区别之处在于,对比例二的保护套管的材料与实施例一的保护套管的材料不同。
对比例二的药物洗脱球囊导管的制备方法如下:
第一步:以紫杉醇作为抗组织增生活性药物,将其与苯甲酸钠载体混合后溶于乙醇中配制药物涂层溶液。对球囊规格为4.0毫米×40毫米的PTA球囊导管进行等离子预处理。将药物涂层溶液喷涂至PTA球囊导管的可扩张球囊表面。常温晾干。再通过球囊折翼机将可扩张球囊折为三个翼并卷绕,得到药物洗脱球囊导管本体。
第二步:将第一步得到的药物洗脱球囊导管本体的可扩张球囊插入原始内径为2毫米、长度为140毫米、热收缩比例为2:1的聚烯烃热缩管中。
第三步:将带有聚烯烃热缩管的药物洗脱球囊导管于125℃加热90秒使聚烯烃热缩管受热收缩,包装、灭菌,得到对比例二的药物洗脱球囊导管。
对比例三
对比例三的药物洗脱支架的结构与实施例四提供的药物洗脱支架的结构基本相同。区别之处在于,对比例三的保护套管的材料与实施例四的保护套管的材料不同,并且对比例三的保护套管上不具有轴向设置的凹槽。
对比例三的药物洗脱支架的制备方法如下:
第一步:以雷帕霉素作为抗组织增生活性药物,将其与聚乳酸载体混合后溶于四氢呋喃中配制药物涂层溶液。将药物涂层溶液滴涂在规格为4.0毫米×38毫米的铁基合金支架表面,于30℃鼓风干燥至恒重,得到药物洗脱支架本体。然后对球囊规格为4.0毫米×40毫米的球囊导管进行等离子预处理。再通过球囊折翼机将球囊导管的可扩张球囊折为三个翼并卷绕。采用压握机将药物洗脱支架本体压握在可扩张球囊的外部。
第二步:将第一步得到的压握在可扩张球囊外部的药物洗脱支架本体插入原始内径为0.044英寸、长度为70毫米的聚四氟乙烯管之中,发现药物洗脱支架本体与可扩张球囊之间发生轴向偏移,测得轴向偏移的距离约为8毫米。
第三步:按照第一步相同的步骤制作压握在可扩张球囊外部的药物洗脱支架本体,并将压握在可扩张球囊外部的药物洗脱支架本体插入内径为0.045英寸、长度为70毫米的聚四氟乙烯管之中,包装、灭菌,得到对比例三的药物洗脱支架。
可扩张球囊本体检测
分别测量实施例一提供的药物洗脱球囊导管的可扩张球囊、及对比例二的药物洗脱球囊导管的可扩张球囊的外观及直径。具体方法如下:分别去掉实施例一提供的药物洗脱球囊导管的可扩张球囊表面的保护套管、及对比例二的药物洗脱球囊导管的可扩张球囊表面的保护套管,将可扩张球囊表面的药物涂层用已被纯化水润湿的无尘布轻轻擦去,采用结晶紫染色的造影剂溶液(例如:碘帕醇溶液、碘海醇溶液、碘普罗胺溶液、碘美普尔溶液、碘喷托溶液、碘佛醇溶液、碘曲仑溶液或者碘克沙醇溶液)将可扩张球囊扩张至名义压力(名义压力是指球囊导管达到包装上所标称的直径时所需的扩张压)。将扩张后的可扩张球囊置于3D显微镜下观察外观,并于20倍放大条件下测量可扩张球囊的实际直径,将其与可扩张球囊的名义直径对比(名义直径是指球囊导管包装上所标称的直径)。可扩张球囊在名义压力下的实际直径测试结果如表2所示。
表2可扩张球囊在名义压力下的实际直径测试结果
表1结果表明:在名义压力下,实施例一提供的药物洗脱球囊导管的可扩张球囊的实际直径为4002.2μm,与球囊规格为4.0毫米×40毫米的PTA球囊导管的名义直径基本相同。对比例二的药物洗脱球囊导管的可扩张球囊的实际直径为3267.5μm,远低于球囊规格为4.0毫米×40毫米的PTA球囊导管的名义直径。
3D显微镜观察结果显示,实施例一提供的药物洗脱球囊导管的可扩张球囊在充盈状态下,位于可扩张球囊中段的有效区域呈规则的圆柱形。对比例二的药物洗脱球囊导管的可扩张球囊在充盈状态下,可扩张球囊的各段区域发生明显变形。
以上结果表明,实施例一提供的药物洗脱球囊导管中,保护套管在溶胀后包裹在可扩张球囊外部,既不会损伤药物洗脱球囊导管的可扩张球囊本体,也不影响可扩张球囊置入人体后的充盈扩张。
总药量测试对比
药物洗脱球囊导管总药量是指负载在药物洗脱球囊导管的可扩张球囊表面的药物涂层中活性药物的总含量。一般通过多个药物洗脱球囊导管的总药量的分布来评价药物洗脱球
囊导管的制备方法的稳定性。
分别按照实施例一、对比例一和对比例二的制备方法,制备每组5个的三组药物洗脱球囊导管样品(以下简称DEB样品)。制备过程中,施加在三组DEB样品的可扩张球囊表面的药物涂层溶液完全相同。然后分别检测三组DEB样品的总药量,以评价由不同材料制成的保护套管对制备方法稳定性的影响。
具体检测方法为:将三组DEB样品去掉保护套管之后,分别浸泡在刚好完全浸没DEB样品的甲醇中。超声使药物涂层溶解于甲醇中。再利用高效液相色谱(简称HPLC)分析甲醇中的紫杉醇浓度,并根据甲醇体积,计算每个DEB样品的紫杉醇总药量。紫杉醇总药量=甲醇中的紫杉醇浓度×甲醇体积。
HPLC检测条件为:日本岛津LC-20A型高效液相色谱仪。色谱柱:美国安捷伦ZOBAX SB-C18柱(4.6×250毫米,5μm)。柱温:30℃。流动相:甲醇:乙腈:水=230:360:410。流速:1.0mL/min。紫外检测器。检测波长:227nm。三组DEB样品的总药量检测结果如表1所示。
表1DEB样品的总药量检测结果
由表1可知:
(1)通过实施例一的制备方法制备的5个样品的平均总药量为1073.42,明显高于通过对比例一及对比例二的制备方法制备的5个样品的平均总药量。
(2)通过实施例一的制备方法制备的5个样品的总药量的标准差为24.97,明显低于通过对比例一及对比例二的制备方法制备的5个样品的总药量的标准差。
以上结果表明,通过本发明提供的制备方法制备的DEB样品具有较高的总药量,原因是保护套管溶胀后包裹在可扩张球囊外部,有效降低生产过程中,DEB样品的可扩张球囊插入保护套管时的药物涂层损失。同时,本发明提供的药物洗脱球囊的制备方法稳定性较高,不同DEB样品之间的总药量差异较小,更适于产业化。
体外模拟输送过程药量损失测试
对实施例一提供的药物洗脱球囊导管和对比例一的药物洗脱球囊导管进行输送过程药量损失的体外模拟测试。药物洗脱球囊导管的输送过程药量损失是指自药物洗脱球囊导管的可扩张球囊置入导引导管开始,逐渐将可扩张球囊推送至病变部位的目标血管,直至可扩张球囊被充盈之前这一时间段内的药物损失量。输送过程药量损失与可扩张球囊表面的初始药量的比值即为输送过程药量损失率。由于可扩张球囊被置入导引导管之前,需要先移除保护套管,之后原本紧密卷绕的各个折翼开始逐渐向外展开。在可扩张球囊被推送至靶病变位点的过程中,血流的高速冲刷会加速各个折翼的展开过程,导致原本被折翼覆盖的区域的药物涂层直接受到血流冲刷发生脱落。因此,内径较小的保护套管对可扩张球囊的折翼的束缚作用较强,去除保护套管后,折翼展开的速度较慢,维持卷绕状态的折翼对覆盖在折翼之下的药物涂层的保护时间较长,输送过程药量损失率较低。
用离体猪冠脉血管模拟人体冠状动脉系统的目标血管,在体外模拟血管模型中进行输送过程药量损失的体外模拟测试。考察药物洗脱球囊导管的输送过程损失。具体方法为:分别撕去实施例一和对比例一制备的药物洗脱球囊导管上的保护套管,再分别将药物洗脱球囊导管插入体外模拟血管模型中,沿模拟血管路径输送至目标血管并停留。从药物洗脱球囊导管插入体外模拟血管模型开始计时,90秒后取出药物洗脱球囊导管。分别利用HPLC分析可扩张球囊表面的残余药量,并按下式计算输送过程药物损失率:
输送过程药物损失率=(可扩张球囊表面初始药量-可扩张球囊表面残余药量)/可扩张球囊表面初始药量×100%。
HPLC检测条件为:日本岛津LC-20A型高效液相色谱仪。色谱柱:美国安捷伦ZOBAX SB-C18色谱柱(4.6×250毫米,5μm)。柱温:30℃。流动相:甲醇:乙腈:水=230:360:410。流速:1.0mL/min。紫外检测器。检测波长:227nm。体外模拟输送过程药量损失测试结果如表3所示。
表3体外模拟输送过程药量损失测试结果
表3数据显示:实施例一提供的药物洗脱球囊导管的输送过程药量损失率明显小于对比例一的药物洗脱球囊导管的输送过程药量损失率。说明实施例一提供的药物洗脱球囊导
管中,溶胀后包裹在可扩张球囊外部的保护套管能有效减少药物洗脱球囊导管在输送过程中的药量损失。
药物洗脱支架轮廓尺寸测试
药物洗脱支架的轮廓尺寸是指将药物洗脱支架本体压握在可扩张球囊外部后,药物洗脱支架本体与可扩张球囊整体的轮廓外径。药物洗脱支架的轮廓尺寸由药物洗脱支架本体与可扩张球囊的压握紧密程度决定。药物洗脱支架的轮廓尺寸较小,利于药物洗脱支架顺利通过弯曲复杂血管和狭窄病变部位。同时表明药物洗脱支架本体与可扩张球囊之间压握紧密。故,药物洗脱支架本体与可扩张球囊之间发生相对移位的风险较小,药物洗脱支架本体自可扩张球囊表面脱落的风险较小。
分别按照实施例四和对比例三的制备方法,制备每组5个的两组药物洗脱支架样品(以下简称DES样品)。制备过程中,施加在两组DES样品的铁基合金支架表面的药物涂层溶液完全相同。然后分别测试两组DES样品的轮廓尺寸。测试结果如表4所示:
表4药物洗脱支架的轮廓尺寸测试结果
由表4可知:与对比例三的DES样品相比,实施例四提供的DES样品具有较小的轮廓尺寸,且5个DES样品的轮廓尺寸数据较集中。说明实施例四提供的DES样品中,溶胀后包裹在DES外部的保护套管可以使得DES样品的外径较小,充分保护涂层并且减小药物支架的轮廓尺寸,使药物洗脱支架本体及可扩张球囊没有向外扩张的空间。而对比例三为了避免药物涂层与保护套管内壁发生摩擦损伤药物涂层或者避免药物洗脱支架本体与可扩张球囊之间移位,只能使用内径较大的保护套管,导致DES样品的轮廓尺寸较大。故,对比例四的药物洗脱支架本体与可扩张球囊之间的结合力较差,增加药物洗脱支架本体自可扩张球囊外部脱落的风险。
综上,本发明提供的载药器械中,保护套管由可被溶剂溶胀的高分子材料制成。在将保护套管套设至载药器械外部的过程中,先将高分子材料制成的保护套管在溶剂中溶胀,
增加保护套管的内径,以利于载药器械在无摩擦的情况下插入保护套管之中,避免损伤载药器械的药物涂层或者器械本体。然后再通过溶剂挥发,使保护套管在无需机械力、热源等外在因素作用下收缩至初始内径,将载药器械束缚至较小的轮廓外径,利于载药器械顺利通过人体内部的弯曲管腔或者狭窄病变部位。
并且,本发明通过在保护套管的管体近端及管体远端之间沿保护套管的轴向设置至少一个凹槽,便于操作者在使用前直接撕掉保护套管。由此,在载药器械与保护套管分离时,避免保护套管内表面与载药器械的外表面之间的摩擦力损伤药物涂层或者器械本体。
本发明提供的药物洗脱球囊导管,既能通过保护套管将药物洗脱球囊导管的可扩张球囊束缚至较小的外部轮廓,还能避免保护套管与药物涂层之间的摩擦力导致药物涂层或者可扩张球囊本体的损伤。无需加热即可使得可扩张球囊被保护套管紧紧束缚至较小的尺寸,不会造成药物涂层中的药物受热降解或者可扩张球囊本体受热变形。并且在保护套管自可扩张球囊的外部去除后,可扩张球囊的多个折翼能继续紧密卷绕,降低输送过程中血流高速冲刷造成的药物损失。
本发明提供的药物洗脱支架,既能通过保护套管将药物洗脱支架本体束缚至较小的外部轮廓,还能避免保护套管与药物涂层之间的摩擦力导致药物涂层,或者药物洗脱支架本体与可扩张球囊之间的移位。无需加热即可使药物洗脱支架本体及可扩张球囊被保护套管紧紧束缚至较小的尺寸,不会造成药物涂层中的药物受热降解或者药物洗脱支架本体及可扩张球囊受热变形。
可以理解的是,以上仅以药物洗脱球囊导管及药物洗脱支架对本发明提供的技术方案做了示意性描述,本发明提供的技术方案也可用于其他介入式医疗器械或者植入式医疗器械。所述介入式器械包括造影导管、中心静脉导管、测压导管、导尿管或者一次性介入治疗仪探头。所述植入式器械包括骨钉或者骨板。只要采用可被溶剂溶胀的高分子材料制成保护套管,并将保护套管先在溶剂中溶胀,再套设于前述介入式医疗器械或者植入式医疗器械外部,再使溶剂挥发,即可达到本发明的目的。
还可以理解的是,以上仅以载药器械对本发明提供的技术方案做了示意性描述,本发明提供的技术方案也可用于其他非载药器械。在将本发明提供的技术方案应用于其他非载药器械时,本发明提供的保护套管仍然具有保护器械本体不受损伤的技术效果,并且可将所述非载药器械紧密束缚至较小的轮廓外径,提高所述非载药器械在人体弯曲管腔部位或者狭窄部位的可通过性。
以上结合附图对本发明的实施例进行了描述,但是本发明并不局限于上述的具体实施方式。上述的具体实施方式仅仅是示意性的,而不是限制性的。本领域的普通技术人员在
本发明的启示下,在不脱离本发明宗旨和权利要求所保护的范围情况下,还可做出很多形式,这些均属于本发明的保护之内。
Claims (16)
- 载药器械,包括器械本体及设于所述器械本体表面的药物涂层,所述载药器械具有收缩状态及扩张状态,所述载药器械在所述收缩状态时的外径较所述载药器械在所述扩张状态时的外径小,所述保护套管套设于所述载药器械的外部,其特征在于,所述保护套管由高分子材料制成,所述保护套管可在有机溶剂中发生溶胀。
- 根据权利要求1所述的载药器械,其特征在于,所述保护套管在所述溶胀后的内径与所述保护套管在所述溶胀前的内径之比范围为(1.1~2):1。
- 根据权利要求1所述的载药器械,其特征在于,所述高分子材料选自硅胶、聚烯烃、聚氨酯及聚氨酯改性聚合物中的至少一种。
- 根据权利要求1所述的载药器械,其特征在于,所述有机溶剂选自甲醇、乙醇、丙酮、氯仿、四氢呋喃、二甲基亚砜或者碳原子个数范围为5个至16个的液态有机烷烃中的至少一种。
- 根据权利要求1所述的载药器械,其特征在于,所述药物涂层包括活性药物,所述活性药物选自抗内膜增生药物、抗凝血药物、抗血小板粘附药物、抗感染药物、抗菌药物、抗炎症反应药物、抗过敏药物或者抗肿瘤药物中的至少一种。
- 根据权利要求5所述的载药器械,其特征在于,所述活性药物选自雷帕霉素、雷帕霉素衍生物、紫杉醇或者紫杉醇衍生物中的至少一种。
- 根据权利要求1所述的载药器械,其特征在于,所述保护套管未溶胀前的轴向长度大于或者等于所述载药器械在所述收缩状态时的轴向长度,所述保护套管未溶胀前的内径小于或者等于所述载药器械在所述收缩状态时的外径。
- 根据权利要求1所述的载药器械,其特征在于,所述保护套管的管体近端及管体远端之间沿所述保护套管的轴向设置至少一个凹槽,且所述凹槽的近端和/或远端具有切口。
- 根据权利要求7所述的载药器械,其特征在于,所述切口沿所述保护套管的轴向的长度范围为5毫米至15毫米。
- 根据权利要求1所述的载药器械,其特征在于,所述载药器械为介入式器械或者植入式器械,所述介入式器械包括药物球囊导管、造影导管、中心静脉导管、测压导管、导尿管或者一次性介入治疗仪探头,所述植入式器械包括药物洗脱支架、骨钉或者骨板。
- 权利要求1所述的载药器械的制作方法,其特征在于,包括以下步骤:将所述药物涂层施加在所述器械本体表面,得到所述载药器械;将所述保护套管置于所述有机溶剂中使所述保护套管溶胀,得到溶胀的保护套管;将所述溶胀的保护套管套设 于所述载药器械的外部并干燥。
- 根据权利要求11所述的制备方法,其特征在于,所述保护套管未溶胀前的轴向长度大于或者等于所述载药器械在所述收缩状态时的轴向长度,所述保护套管未溶胀前的内径小于或者等于所述载药器械在所述收缩状态时的外径。
- 根据权利要求11所述的制备方法,其特征在于,在将所述溶胀的保护套管套设于所述载药器械的外部并干燥前,所述制备方法还包括去除所述溶胀的保护套管表面的残留的有机溶剂。
- 根据权利要求11所述的制备方法,其特征在于,所述保护套管的管体近端及管体远端之间沿所述保护套管的轴向设置至少一个凹槽,在去除所述溶胀的保护套管表面的残留的有机溶剂之后,所述制备方法还包括在所述凹槽的近端和/或远端形成切口。
- 根据权利要求11所述的制备方法,其特征在于,所述溶胀的时间范围为5分钟至24小时。
- 根据权利要求11所述的制备方法,其特征在于,所述干燥包括常温晾干、鼓风干燥、真空干燥、冷冻干燥、或者于30℃至60℃加热干燥。
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| CN110201243B (zh) * | 2019-07-09 | 2021-10-26 | 科睿驰(深圳)医疗科技发展有限公司 | 一种复合药物涂层球囊导管及其制备方法 |
| CN113735664A (zh) * | 2021-08-29 | 2021-12-03 | 中北大学 | 一种七孔多层发射药的端面喷涂制备方法 |
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| CN115103703A (zh) * | 2020-11-02 | 2022-09-23 | 元心科技(深圳)有限公司 | 一种球囊扩张支架系统用长球囊及其制备方法 |
| CN113018649A (zh) * | 2021-02-05 | 2021-06-25 | 北京先瑞达医疗科技有限公司 | 一种新型结构的药物输送导管及其制备方法 |
| CN113018649B (zh) * | 2021-02-05 | 2022-07-15 | 北京先瑞达医疗科技有限公司 | 一种药物输送导管及其制备方法 |
| CN114432569A (zh) * | 2021-12-31 | 2022-05-06 | 华中科技大学同济医学院附属协和医院 | 一种介入导管的表面处理方法及设备 |
| CN114432569B (zh) * | 2021-12-31 | 2023-08-29 | 华中科技大学同济医学院附属协和医院 | 一种介入导管的表面处理方法及设备 |
| CN120189616A (zh) * | 2025-03-10 | 2025-06-24 | 普利瑞医疗科技(苏州)有限公司 | 一种球囊导管保护套的制备方法 |
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| CN108295359A (zh) | 2018-07-20 |
| CN108295359B (zh) | 2021-05-07 |
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