CN112315519B - A root tissue ligation device - Google Patents
A root tissue ligation device Download PDFInfo
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- CN112315519B CN112315519B CN202011144531.XA CN202011144531A CN112315519B CN 112315519 B CN112315519 B CN 112315519B CN 202011144531 A CN202011144531 A CN 202011144531A CN 112315519 B CN112315519 B CN 112315519B
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- 230000007246 mechanism Effects 0.000 claims description 10
- 230000002441 reversible effect Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000004804 winding Methods 0.000 description 12
- 208000006011 Stroke Diseases 0.000 description 11
- 206010003658 Atrial Fibrillation Diseases 0.000 description 10
- 210000001519 tissue Anatomy 0.000 description 10
- 206010008190 Cerebrovascular accident Diseases 0.000 description 9
- 210000005248 left atrial appendage Anatomy 0.000 description 9
- 230000010100 anticoagulation Effects 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 230000002490 cerebral effect Effects 0.000 description 6
- 208000005189 Embolism Diseases 0.000 description 3
- 238000001356 surgical procedure Methods 0.000 description 3
- 208000032843 Hemorrhage Diseases 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 2
- 208000034158 bleeding Diseases 0.000 description 2
- 230000000740 bleeding effect Effects 0.000 description 2
- 208000026106 cerebrovascular disease Diseases 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 208000014674 injury Diseases 0.000 description 2
- 238000002560 therapeutic procedure Methods 0.000 description 2
- 230000008733 trauma Effects 0.000 description 2
- 206010018833 Haematocoele Diseases 0.000 description 1
- 208000005873 Hematocele Diseases 0.000 description 1
- 208000001435 Thromboembolism Diseases 0.000 description 1
- 208000007536 Thrombosis Diseases 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 239000003146 anticoagulant agent Substances 0.000 description 1
- 229940127219 anticoagulant drug Drugs 0.000 description 1
- 206010003119 arrhythmia Diseases 0.000 description 1
- 230000001746 atrial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000000747 cardiac effect Effects 0.000 description 1
- 206010061592 cardiac fibrillation Diseases 0.000 description 1
- 238000007675 cardiac surgery Methods 0.000 description 1
- 230000001269 cardiogenic effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002600 fibrillogenic effect Effects 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 201000004920 hematocele of tunica vaginalis testis Diseases 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 210000005036 nerve Anatomy 0.000 description 1
- 210000003516 pericardium Anatomy 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 210000003813 thumb Anatomy 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- A61B17/0057—Implements for plugging an opening in the wall of a hollow or tubular organ, e.g. for sealing a vessel puncture or closing a cardiac septal defect
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- A61B17/0057—Implements for plugging an opening in the wall of a hollow or tubular organ, e.g. for sealing a vessel puncture or closing a cardiac septal defect
- A61B2017/00575—Implements for plugging an opening in the wall of a hollow or tubular organ, e.g. for sealing a vessel puncture or closing a cardiac septal defect for closure at remote site, e.g. closing atrial septum defects
- A61B2017/00623—Introducing or retrieving devices therefor
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- Health & Medical Sciences (AREA)
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- Biomedical Technology (AREA)
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- Cardiology (AREA)
- Heart & Thoracic Surgery (AREA)
- Medical Informatics (AREA)
- Molecular Biology (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Surgical Instruments (AREA)
Abstract
The invention relates to a root tissue ligation device which comprises a telescopic component, a ligation component and a wire collecting rod, wherein the ligation component comprises a ligation sleeve, a ligation wire, a positioning bolt and a knot pushing device, the positioning bolt is arranged at the front end of the telescopic component, the length of the telescopic component is telescopic, the front end of the ligation sleeve is annularly arranged, the two ends of the ligation sleeve are fixed at the front end of the positioning bolt, a ligation wire fixing groove is formed in the inner side of the ligation sleeve, one end of the ligation wire is wound in the middle of the ligation wire to form an upper hanging knot, the front end of the ligation wire surrounds the ligation wire to form a loop, the loop is arranged in the ligation wire fixing groove, the rear end of the ligation wire penetrates through the positioning bolt and is connected with one end of the wire collecting rod, the wire collecting rod is arranged in the telescopic component, and the other end of the wire collecting rod is exposed out of an inner sleeve. The invention has simple structure and low manufacturing cost, and can ligate root tissues (such as auricles) with small wound surface and low risk.
Description
Technical Field
The present invention relates to a root tissue ligation device.
Background
Atrial fibrillation (atrial fibrillation or AF for short) is one of the most clinically common cardiac arrhythmias. Research at home and abroad shows that the total incidence rate of the species atrial fibrillation of the crowd is 0.89 percent. And 16% -21.5% of cerebral apoplexy (cerebral apoplexy is also called apoplexy or cerebrovascular accident, is a group of sudden onset diseases, acute cerebrovascular diseases which are characterized by focal nerve function deficiency) is caused by thrombus shedding caused by atrial fibrillation, and cerebral apoplexy caused by non-valve ward fibrillation accounts for 50% -67.1% of cardiogenic cerebral apoplexy cases. The incidence rate of cerebral apoplexy of patients suffering from atrial fibrillation is more than 4%, and the mortality rate and disability rate caused by cerebral apoplexy can reach about 50%. Therefore, the method has important clinical significance for preventing atrial fibrillation and stroke.
Anticoagulation is currently the standard method for preventing complications of atrial fibrillation and stroke, but there is a limit to anticoagulation, such as that some patients cannot be anticoagulated due to anticoagulation contraindication or relative contraindication, or that anticoagulants are easily affected by drugs and foods to increase detection trouble, so that some patients cannot adhere to anticoagulation for a long time. In addition, anticoagulation therapy itself has bleeding complications, which reduce the long-term anticoagulation adherence rate of patients and limit the effectiveness of anticoagulation therapy. Therefore, the adoption of more effective and safer measures has important significance in preventing atrial fibrillation and apoplexy.
At present, a method for blocking the left auricle by using a medical interventional treatment method is also greatly developed, and the treatment technology is a good choice for patients with severe bleeding and anticoagulation tabu patients. The commonly used left auricle plugging technique is to plug the left auricle by using a percutaneous left auricle transconductance tube plugging device (per unit LEFT ATRIAL APPENDAGE TRANSCATHETER occlusion-plato), such as APPRIVA MEDICAL company, and plug the left auricle by using a Amplazer room plugging umbrella. The method for plugging the left auricle by using the PLAATO device has the advantages of small operation wound, high success rate, low thromboembolism incidence rate and the like, is ordered at a time, but has high incidence rate of heart and pericardium hematocele, which is a complication of operation, and the incidence rate is about 6.9 percent at present, so that the design structure of the device and the accumulated operation experience are further required to be perfected. While for Amplazer occluding umbrellas, many professionals consider it not to be a suitable LAA (percutaneous left atrial appendage occlusion) occluding device, it is not specifically designed for LAA occlusion, but for atrial defects, and thus consider that left atrial appendage occlusion surgery is not to be performed without suitable equipment.
Cardiac surgery is simple and easy to perform to simultaneously cut or close the left atrial appendage, so many doctors claim to cut or close the left atrial appendage while requiring cardiac surgical treatment for such patients. However, the surgical trauma is large for simply cutting or closing the left atrial appendage and is not suitable for performing surgery. Odell (Oracle) et al in 1996 reported a technique for preventing atrial fibrillation embolism by sealing the left atrial appendage via thoracoscopy, which has received great attention due to greatly reduced surgical trauma and risk. If the effect of the left atrial appendage closure in the technology can be further improved, the left atrial appendage closure by thoracoscopy has good application prospect for preventing atrial fibrillation embolism.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a root tissue ligation device aiming at the defects.
In order to solve the technical problems, the invention adopts the following technical scheme:
The root tissue ligation device comprises a telescopic component, a ligation component and a wire collecting rod, wherein the ligation component comprises a ligation sleeve, a ligation wire, a positioning bolt and a knot pushing device, the positioning bolt is arranged at the front end of the telescopic component, the length of the telescopic component is telescopic, the front end of the ligation sleeve is annularly arranged, the two ends of the ligation sleeve are fixed at the front end of the positioning bolt, a ligation wire fixing groove is formed in the inner side of the ligation sleeve, one end of the ligation wire is wound in the middle of the ligation wire to form an upper hanging knot, the front end of the ligation wire surrounds the loop to form a loop, the loop is arranged in the ligation wire fixing groove, the rear end of the ligation wire penetrates through the positioning bolt and is connected with one end of the wire collecting rod, and the wire collecting rod is slidably arranged in the telescopic component;
the knot pusher comprises a cylinder sleeve and a push rod, wherein the cylinder sleeve is arranged outside a ligature in a covering mode and is positioned at the rear end of an upper hanging knot, the front end of the push rod is connected with the cylinder sleeve, the rear end of the push rod penetrates through a positioning bolt, and the push rod is used for pushing the cylinder sleeve to enable the upper hanging knot to move towards the front end so as to close the loop.
Further, the telescopic component comprises an outer sleeve and an inner sleeve, the outer sleeve is arranged on the outer side of the inner sleeve in a coating mode, the inner sleeve can slide along the outer sleeve, and the positioning bolt is arranged at the front end of the inner sleeve.
Further, the cross-sectional shape of outer tube is the U-shaped, the interior sleeve pipe outside is provided with the spout, U-shaped outer tube inboard is provided with spout complex arch, can slide in parallel along interior sleeve pipe outside in the outer tube.
Further, the rear end of the inner sleeve is provided with a rear positioning bolt, the rear ends of the wire winding rod and the knot pusher penetrate through the rear positioning bolt, and the wire winding rod and the knot pusher can slide along the rear positioning bolt.
Further, the bottom of the outer sleeve is provided with a handle, the side surface of the outer sleeve is provided with a square through hole, and the handle is provided with a trigger for clamping the inner sleeve to enable the inner sleeve to be incapable of sliding in the outer sleeve.
Further, the middle part of push rod is provided with first piston, be located the first piston outside in the interior sleeve pipe and be provided with first piston groove along the axis direction of push rod, first piston sets up in first piston inslot, the one end that the ligature was kept away from to the receipts line pole is provided with the second piston, the interior sleeve pipe is located the second piston outside and is provided with the second piston groove along the axis direction of receipts line pole, the second piston sets up in the second piston inslot, first piston groove is connected with the one end of second piston groove syntropy, when the knot forward end removal is promoted to the knot in pushing away from to the knot, and first piston moves and promotes the second piston at second piston inslot direction, makes the reverse removal of receipts line pole pulling ligature rear end.
Further, a groove is vertically formed in the middle of the cylinder sleeve, a blade is arranged in the groove, moving mechanisms are arranged on two sides of the blade, and the moving mechanisms are used for driving the blade to move so as to cut off the ligature.
After the technical scheme is adopted, compared with the prior art, the invention has the following advantages:
the invention has simple structure and low manufacturing cost, and can ligate root tissues (such as auricles) with small wound surface and low risk.
The invention will now be described in detail with reference to the drawings and examples.
Drawings
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a schematic cross-sectional view of the present invention;
FIG. 3 is a schematic cross-sectional view of an outer sleeve;
FIG. 4 is a schematic perspective view of another embodiment of the present invention;
FIG. 5 is a schematic cross-sectional view of another embodiment of the present invention;
FIG. 6 is a schematic cross-sectional view of another embodiment of an outer sleeve;
FIG. 7 is a schematic perspective view of another embodiment of the present invention;
FIG. 8 is a schematic cross-sectional view of another embodiment of the present invention;
FIG. 9 is a schematic cross-sectional view of a cylinder jacket;
FIG. 10 is a state diagram of the use of the present invention;
FIG. 11 is a state diagram of the use of the present invention;
fig. 12 is a schematic view of the root tissue after ligation.
In the drawings, the list of components represented by the various numbers is as follows:
1. The telescopic component comprises a telescopic component, a telescopic sleeve, a 111, a square through hole, a 12, an inner sleeve, a 121, a chute, a 13, a handle, a 131, a trigger, a 2, a ligature component, a 21, a ligature sleeve, a 211, a ligature fixing groove, a 22, a ligature, a 221, an upper hanging knot, a 23, a locating bolt, a 24, a knot pusher, a 241, a cylinder sleeve, a 242, a push rod, a 243, a first piston, a 244, a first piston groove, a 245, a blade, a 246, a moving mechanism, a 25, a rear locating bolt, a3, a wire collecting rod, a 31, a second piston, a 32 and a second piston groove.
Detailed Description
The principles and features of the present invention are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Embodiment 1, as shown in fig. 1 and 2, a root tissue ligation device comprises a telescopic component 1, a ligation component 2 and a wire collecting rod 3, wherein the ligation component 2 comprises a ligation sleeve 21, a ligature 22, a positioning bolt 23 and a knot pushing device 24, the positioning bolt 23 is arranged at the front end of the telescopic component 1, the telescopic component 1 is telescopic in length, the front end of the ligation sleeve 21 is annularly arranged, the two ends of the front end of the ligation sleeve are fixed at the front end of the positioning bolt 23, the inner side of the ligation sleeve 21 is provided with a ligature fixing groove 211, as shown in fig. 3, the cross section of the ligature fixing groove 211 is circular, the axis of the ligature fixing groove is positioned below the axis of the ligation sleeve 21, one end of the ligature 22 is wound in the middle of the ligature 22 to form an upper hanging knot 221, the front end of the ligature 22 surrounds to form a loop, the loop is arranged in the ligature fixing groove 211, the rear end of the ligature 22 penetrates through the positioning bolt 23 and is connected with one end of the wire collecting rod 3, the wire collecting rod 3 is arranged in the assembly 1, the other end of the ligature rod 3 is arranged in the telescopic component 12, and the knot pushing device 24 is arranged outside the ligature 23 and can be separated from the hanging knot 23, and is arranged outside the positioning bolt 23.
Embodiment 2, as shown in fig. 4 and 5, a root tissue ligation device comprises a telescopic component 1, a ligation component 2 and a wire collecting rod 3, wherein the ligation component 2 comprises a ligation sleeve 21, a ligature 22, a positioning bolt 23 and a pushing device 24, the positioning bolt 23 is arranged at the front end of the telescopic component 1, the telescopic component 1 is telescopic in length, the front end of the ligation sleeve 21 is annularly arranged, the two ends of the front end of the ligation sleeve are fixed at the front end of the positioning bolt 23, the inner side of the ligation sleeve 21 is provided with a ligature fixing groove 211, as shown in fig. 6, the cross section of the ligature fixing groove 211 is circular, the axis of the ligature fixing groove 211 and the axis of the ligation sleeve 21 are arranged on the same horizontal plane, one end of the ligature 22 is wound at the middle of the ligature 22 to form an upper hanging knot 221, the front end of the ligature 22 surrounds to form a loop, the loop is arranged in the ligature fixing groove 211, the rear end of the ligature 22 penetrates through the positioning bolt 23 and is connected with one end of the wire collecting rod 3, the wire collecting rod 3 is arranged in the ligature 1, the other end of the ligature 22 is arranged in the telescopic component 3, and the pushing device is arranged on the sliding device 23, and the other end of the ligature rod is exposed out of the positioning sleeve 24.
As an embodiment, the telescopic assembly 1 includes an outer sleeve 11 and an inner sleeve 12, the outer sleeve 11 is wrapped and arranged outside the inner sleeve 12, the inner sleeve 12 can slide along the outer sleeve 11, and the positioning bolt 23 is arranged at the front end of the inner sleeve 12.
As an embodiment, the cross-section of the outer sleeve 11 is U-shaped, a chute 121 is provided on the outer side of the inner sleeve 12, a protrusion matching with the chute 121 is provided on the inner side of the U-shaped outer sleeve 11, and the outer sleeve 11 can slide in parallel along the outer side of the inner sleeve 12.
As an embodiment, the knot pusher 24 includes a cylinder cover 241 and a push rod 242, the cylinder cover 241 is wrapped around the outer side of the ligature 22 and is located at the rear end of the upper hanging knot 221, the front end of the push rod 242 is connected with the cylinder cover 241, the rear end of the push rod 242 penetrates the positioning bolt 23, and the push rod 242 is used for pushing the cylinder cover 241 to move the upper hanging knot 221 towards the front end to close the loop.
As an embodiment, the rear end of the inner sleeve 12 is provided with a rear positioning bolt 25, the rear ends of the wire winding rod 3 and the knot pusher 24 penetrate through the rear positioning bolt 25, and the wire winding rod 3 and the knot pusher 24 can slide along the rear positioning bolt 25.
The rear ends of the wire winding rod 3 and the push rod 242 are handheld ends, and anti-skid patterns are arranged on the outer sides of the handheld ends of the wire winding rod 3 and the push rod 242.
As shown in fig. 7, as an embodiment, a handle 13 is provided at the bottom of the outer sleeve 11, a square through hole 111 is provided on the side surface of the outer sleeve 11, and a trigger 131 for locking the inner sleeve 12 so that the inner sleeve 12 cannot slide in the outer sleeve 11 is provided on the handle 13, in this embodiment, a rubber sleeve is provided at the top of the trigger 131, a torque spring is provided in the middle of the trigger 131, the torque spring increases the elasticity to make the rubber sleeve at the top of the trigger 131 closely contact with the lower end surface of the inner sleeve 12, and the rubber sleeve blocks the inner sleeve 12 from sliding in the outer sleeve 11;
In use, a user presses the trigger 131 to rotate the trigger while the rubber sleeve on the top of the trigger is away from the lower end face of the inner sleeve, and the inner sleeve is slid in the direction through hole region using the thumb.
As shown in fig. 8, as an embodiment, a first piston 243 is disposed in the middle of the push rod 242, a first piston groove 244 is disposed in the inner sleeve 12 outside the first piston 243 along the axial direction of the push rod 242, the first piston 243 is disposed in the first piston groove 244, a second piston 31 is disposed at one end of the wire winding rod 3 away from the wire winding 22, a second piston groove 32 is disposed in the inner sleeve 12 outside the second piston 31 along the axial direction of the wire winding rod 3, the second piston 31 is disposed in the second piston groove 32, the first piston groove 244 is connected with one end of the second piston groove 31 in the same direction, and when the ejector 24 pushes the upper hoist 221 to move toward the front end, the first piston 243 moves forward in the first piston groove 244 and pushes the second piston 32 to move in the direction of the second piston groove 32, so that the wire winding rod 3 pulls the rear end of the wire winding 22 to move reversely.
As shown in fig. 9, as an embodiment, a slot is vertically formed in the middle of the cylindrical sleeve 241, a blade 245 is disposed in the slot, and moving mechanisms 246 are disposed on two sides of the blade 245, and the moving mechanisms 246 are used for driving the blade 245 to move so as to cut off the ligature 22;
The push rod 242 has a push rod 2421 at its rear end, the push rod 2421 is triangular in shape, the side of the outer sleeve 11 is provided with a groove for sliding the push rod 2421 in the groove, the push rod 2421 is provided with a control button, the control button is connected with a moving mechanism 246, and when the control button is triggered by a user, the moving mechanism drives the blade to move so as to cut off the ligature.
The application method of the invention comprises the following steps:
Step 1, winding the front end of the ligature sleeve 21 in the middle of the ligature sleeve 21 to form an upper hanging knot 221, and fixing the rear end of the ligature sleeve 21 on the wire collecting rod 3;
step 2, as shown in fig. 7, pushing the telescopic end of the telescopic mechanism to enable the ligature sleeve 21 to move towards the root tissue of the patient, and moving the ligature sleeve 21 to enable the movement of the front end of the ligature wire 22 to encircle the outer side of the root tissue;
Step 3, as shown in fig. 8, pushing the knot pusher 24 to push the upper hoist 221 forward to close the loop of the ligature 22, so that the loop is contracted to shrink the root assembly;
And 4, cutting off redundant ligatures as shown in fig. 9, and taking out the ligature device.
The foregoing is illustrative of the best mode of carrying out the invention, and is not presented in any detail as is known to those of ordinary skill in the art. The protection scope of the invention is defined by the claims, and any equivalent transformation based on the technical teaching of the invention is also within the protection scope of the invention.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011144531.XA CN112315519B (en) | 2020-10-23 | 2020-10-23 | A root tissue ligation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011144531.XA CN112315519B (en) | 2020-10-23 | 2020-10-23 | A root tissue ligation device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112315519A CN112315519A (en) | 2021-02-05 |
| CN112315519B true CN112315519B (en) | 2025-02-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011144531.XA Active CN112315519B (en) | 2020-10-23 | 2020-10-23 | A root tissue ligation device |
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| CN (1) | CN112315519B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115462856B (en) * | 2022-09-06 | 2023-04-25 | 南京鼓楼医院 | Left auricle ligator |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN214073411U (en) * | 2020-10-23 | 2021-08-31 | 宋来春 | Root tissue ligation device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4674114B2 (en) * | 2004-05-20 | 2011-04-20 | オリンパス株式会社 | Medical device and treatment system for living tissue |
| US7645285B2 (en) * | 2004-05-26 | 2010-01-12 | Idx Medical, Ltd | Apparatus and methods for occluding a hollow anatomical structure |
| CN106880389A (en) * | 2017-03-30 | 2017-06-23 | 北京市普惠生物医学工程有限公司 | A tissue clamping system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN214073411U (en) * | 2020-10-23 | 2021-08-31 | 宋来春 | Root tissue ligation device |
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