CN111803152B - Surgical annular minimally invasive retractor - Google Patents
Surgical annular minimally invasive retractor Download PDFInfo
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- CN111803152B CN111803152B CN202010675241.1A CN202010675241A CN111803152B CN 111803152 B CN111803152 B CN 111803152B CN 202010675241 A CN202010675241 A CN 202010675241A CN 111803152 B CN111803152 B CN 111803152B
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- spring
- retracting
- forceps
- retraction
- arm
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/02—Surgical instruments, devices or methods, e.g. tourniquets for holding wounds open; Tractors
- A61B17/0206—Surgical instruments, devices or methods, e.g. tourniquets for holding wounds open; Tractors with antagonistic arms as supports for retractor elements
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/02—Surgical instruments, devices or methods, e.g. tourniquets for holding wounds open; Tractors
- A61B17/0218—Surgical instruments, devices or methods, e.g. tourniquets for holding wounds open; Tractors for minimally invasive surgery
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/02—Surgical instruments, devices or methods, e.g. tourniquets for holding wounds open; Tractors
- A61B17/0293—Surgical instruments, devices or methods, e.g. tourniquets for holding wounds open; Tractors with ring member to support retractor elements
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/02—Surgical instruments, devices or methods, e.g. tourniquets for holding wounds open; Tractors
- A61B17/0218—Surgical instruments, devices or methods, e.g. tourniquets for holding wounds open; Tractors for minimally invasive surgery
- A61B2017/0225—Surgical instruments, devices or methods, e.g. tourniquets for holding wounds open; Tractors for minimally invasive surgery flexible, e.g. fabrics, meshes, or membranes
Abstract
The invention discloses an annular minimally invasive retractor for surgery, which comprises a retracting spring and retracting forceps, wherein the retracting spring is a sheet clockwork spring, the axial lower part of the retracting spring is bent towards an axis to form a conical puncture sharp edge, the head part of the retracting forceps is inserted into the retracting spring from the axial upper end of the retracting spring, and the retracting spring is unfolded from inside to outside by the retracting forceps to complete the retracting action of an operation position. The retraction spring is a clockwork spring, during use, the puncture sharp blade at the bottom of the retraction spring is punctured into the position to be treated, after the retraction spring is inserted to the expected depth, the distraction force is applied from the inside through the retraction forceps, when the inside of the clockwork spring is subjected to outward distraction force, the circumference can be uniformly opened, the force on the skin and flesh tissues around the circumference is uniform, the damage to the skin and flesh tissues is reduced as much as possible, after the retraction spring is distracted to a certain degree, the space of the center position of the retraction spring is enlarged, the treatment tube or the operation needle is allowed to enter, and the operation is carried out along the retraction spring inwards to the position to be treated.
Description
Technical Field
The invention relates to the field of minimally invasive retractors, in particular to an annular minimally invasive retractor for surgery.
Background
The local operation is gradually changed from an open surgical operation execution mode to a minimally invasive operation with a small incision, the minimally invasive operation has the advantages of small incision, easy healing, reduced pain and short recovery time, and is gradually popularized and used, and for the operation of the spine surgery, if a large incision is used for the open operation, the healing time is greatly prolonged, and the injury to skin and flesh tissues around the spine is huge.
The minimally invasive surgery is to cut into a target position through a small component, then push surrounding skin and flesh tissues to reserve an operation space, and perform local accurate surgical treatment through a small scalpel or a treatment tube.
CN200820157820.1 discloses a spinal minimally invasive surgery retracting device, which pulls a skin and flesh tissue through a plurality of blunt traction hooks, thereby causing two problems, one is that the skin and flesh tissue is only contacted with four blunt traction hooks at an incision position, i.e. only four positions are subjected to retraction force during pulling, the circumferential stress is not uniform, which causes aggravation of pain and blood seepage on a section which is not contacted with the skin and flesh tissue, not only blood seepage is caused, but also fat particles can fall into a surgery area on the section, which is not beneficial to surgery; secondly, the following steps: the retracting force is directly loaded by the blunt head pulling hook, and the discomfort of the injured person can be caused by the overlarge retracting force due to the poor manipulation of the user during the force application.
Disclosure of Invention
The invention aims to provide a surgical annular minimally invasive retractor to solve the problems in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a surgery is with annular wicresoft retractor, includes and draws back spring and tractive pincers, draws back the spring and is the slice clockwork spring, draws back the spring axial lower part and buckles into the toper towards the axis and constitute the puncture sharp sword, draws back in the pincers head inserts the spring of drawing back from the axial upper end of drawing back the spring, and tractive pincers will draw back the spring and from interior to exterior struts the operation position and draw back the action. The retraction spring is a clockwork spring, when in use, the puncture sharp blade at the bottom of the retraction spring pierces the position to be treated and is inserted to the expected depth, the spreading force is applied from the inside through the spreading forceps, the circumference can be uniformly spread when the inside of the clockwork spring is subjected to the outward spreading force, the force to the surrounding flesh and skin tissues is uniform, the damage to the flesh and skin tissues is reduced as much as possible, after the retraction spring is spread to a certain degree, the space of the central position of the utility model is enlarged, the treatment tube or the operation needle is allowed to enter, the operation is carried out along the retraction spring to the position to be treated, the wound is small when the skin and flesh tissues are retracted, therefore, healing is faster after treatment, and the aim of minimally invasive treatment is achieved, when spinal surgery is performed, the patient usually punctures from the back or the side of the patient, and attention should be paid to the fact that when puncturing and retracting, the puncture part is loosened when the patient lies on a sickbed.
Furthermore, the outer surface of the retraction spring is sleeved with an elastic cylindrical membrane, and the cylindrical membrane is a medical silica gel membrane.
If the outer surface of the retraction spring is in direct contact with the skin and flesh tissues, a vertical sideline exists on the outer surface of a cylinder of the retraction spring, so that the outer surface of the spring and the skin and flesh tissues can slide relatively in the opening process, the relative sliding between the sharp edge and the skin and flesh tissues is inevitable during puncture, but the skin and flesh tissues and foreign matters can be prevented from sliding relatively in the retraction process, and the spring reed is a metal part, so that the skin and flesh tissues can stimulate cells and cause local position discomfort if the skin and flesh tissues are in contact with the spring and slide relatively in the retraction process, therefore, the cylindrical membrane is radially expanded by arranging the cylindrical membrane on the outer surface of the retraction spring, and even if the sideline on the outer surface of the spring moves circumferentially in the retraction process, the cylindrical membrane keeps the circumferential position, and has elasticity so as not to break, skin meat tissue is when being strutted, keep the contact with cylinder membrane same position, the degree that oozing appears in the process of strutting reduces greatly, and, because the cylinder membrane keeps constantly with the contact of puncture position skin meat, theoretically there is not skin meat tissue direct and air contact, it is possible to reduce the air oxidation, at the process of retracting, skin meat tissue also can be extruded foreign matter such as fat granule, if, be two claws, the retractor of three-jaw pincers class, not only have skin meat tissue direct and air contact, the pollution probability increases, and, fat granule on the puncture tangent plane if being extruded at the process of retracting, can drop the operation position, influence the operation and go on, also be convenient for taking out, cause many operation problems. The silica gel membrane is breathable, water-repellent, good in skin-friendly property and good in elasticity, and blood seepage is not prone to occur and the silica gel membrane is not stuck on the cylindrical membrane.
Furthermore, the pulling-open forceps comprise a front arm, a forceps shaft and a rear arm, wherein the front arm and the rear arm are respectively two, the front arm and the rear arm on the same side are connected, and the joint of the front arm and the rear arm is hinged with the forceps shaft. The rear arm is held by hand, in the initial position, the two front arms are tightly close to the rear arm and are opened, the heads of the front arms are vertically inserted into the retraction spring, the rear arm is manually extruded, the rear arms are closed, the front arms are opened, the retraction spring is opened, and the opening degree of the front arms is controlled by the opening degree of the front arms.
Furthermore, the retracting forceps further comprise a spiral spring, at least one group of front arms and rear arms are connected through the spiral spring, the axis of the spiral spring is overlapped with the axis of the forceps shaft, one end of the spiral spring is connected with the front arms, the other end of the spiral spring is connected with the rear arms, and the elasticity of the spiral spring is larger than that of the retracting spring.
The front arm is connected with the clamp shaft through a hinge ring, the front arm rotates around the clamp shaft, the rear arm is hinged through a similar annular structure, one point on the circumference of the hinge ring is connected with the outer end of the volute spiral spring and the first connecting joint, the inner end of the volute spiral spring and the second connecting joint are connected with the annular hinge structure of the rear arm, when the rear arm rotates around the clamp shaft, the second connecting joint is driven to rotate, the volute spiral spring winds up loading elastic force, and the first connecting joint is driven to drive the front arm to rotate.
The addition of the scroll spring ensures that when the rear arm is manually squeezed, the front arm does not immediately rotate to the expected position, but moves by overcoming the opening resistance of the retraction spring under the elastic force of the scroll spring, the scroll spring is a spring with fixed elastic force, the elastic force of the scroll spring is irrelevant to the stroke, so that even if the force borne by the rear arm when the rear arm is closed is large, the force of the scroll spring for driving the front arm to open is a determined value, the force for driving the front arm to open is determined by the elastic modulus of the scroll spring, the elastic force of the scroll spring is larger than the opening resistance of the retraction spring, the larger the force is, the faster the retraction is, but the discomfort of the body of the wounded is larger, the skin and flesh tissue retraction force at the puncture position can be controlled by reasonably determining the degree that the elastic modulus of the scroll spring is larger than the retraction spring, and the discomfort of the wounded is reduced under the condition of ensuring the retraction purpose, furthermore, the scroll spring isolates the force applied by the hand of the user from the force applied by the forearm, thereby eliminating the influence of the user's manipulation.
Furthermore, the pulling-open pliers further comprise ratchets and door-shaped buckles, the side faces, far away from each other, of the rear arms are respectively provided with a plurality of symmetrical ratchets, the ratchets are distributed along the length direction of the rear arms, the door-shaped buckles are door-shaped nails with different widths, and the door-shaped buckles are inserted into the ratchets. The shape of the door-shaped buckle is the same as that of the staple, the door-shaped buckle is a set of parts with different widths, when the rear arm is folded to the expected position, the door-shaped buckle is buckled into the ratchet, and the rear arm is prevented from opening and the front arm is prevented from folding after the hand is loosened. The ratchet is matched with the door-shaped buckle to realize the position locking of the rear arm.
Furthermore, the compression elasticity of the volute spiral spring is 3-6N greater than the opening resistance of the retracting spring. The force of 3-6 cattle can just retract skin and meat tissues without causing discomfort.
Further, the part of the forearm inserted into the retraction spring is provided with a sliding projection. When the front arm is opened to open the retraction spring, the end part of the front arm and the inner wall of the retraction spring slide relatively, and the sliding bulge improves the sliding condition.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, the spring piece is retracted to perform annular full-size retraction, skin and flesh tissues are uniformly extruded, the cutting feeling of the incision position is reduced, the cylindrical membrane tightly attached to the incision seals the incision of the skin and flesh tissues, fat or muscle particles on the section are prevented from dropping to the operation position to influence the operation, and meanwhile, blood seepage caused by uneven extrusion of the incision is also prevented; the volute spiral spring on the retracting forceps separates the force applied by the hand of a user from the retracting force, prevents the retracting force from being too large caused by too violent or too fast force application of the user, controls the retracting degree by the closing degree of the rear arm, locks the door-shaped buckle through the ratchet and is simple and convenient to operate.
Drawings
In order that the present invention may be more readily and clearly understood, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments that are illustrated in the appended drawings.
FIG. 1 is a schematic view of the cylindrical membrane and retraction spring of the present invention in use inserted into flesh and skin tissue;
FIG. 2 is a top view of the retraction spring of the present invention in its initial state;
FIG. 3 is a top view of the retraction spring of the present invention in an expanded state;
FIG. 4 is a schematic view of the rear arm of the retractor of the invention when it is deployed;
FIG. 5 is a schematic view of the rear arms of the retractor of the present invention when closed;
FIG. 6 is a perspective view of the connection of the jaw shaft, front arm, spiral spring and rear arm of the present invention;
FIG. 7 is a schematic view of the ratchet and door latch of the present invention.
In the figure: 1-cylindrical membrane, 2-retraction spring, 21-puncture sharp blade, 3-retraction forceps, 31-sliding bulge, 32-forceps shaft, 33-front arm, 331-hinged ring, 34-volute spring, 341-first connecting joint, 342-second connecting joint, 35-rear arm, 36-ratchet, 37-door-shaped buckle and 9-treatment tube.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in figures 1-3, the annular minimally invasive retractor for the surgery comprises a retracting spring 2 and retracting forceps 3, wherein the retracting spring 2 is a sheet-shaped clockwork spring, the axial lower part of the retracting spring 2 is bent towards the axis to form a conical puncture sharp blade 21, the head of the retracting forceps 3 is inserted into the retracting spring 2 from the axial upper end of the retracting spring 2, and the retracting forceps 3 are used for retracting the retracting spring 2 from inside to outside to finish the retracting action of the surgery position. The retraction spring 2 is a clockwork spring, when in use, the puncture sharp blade 21 at the bottom of the retraction spring 2 pierces the position to be treated and is inserted to the expected depth, the spreading force is applied from the inside by the spreading forceps 3, the circumference can be uniformly spread when the inside of the clockwork spring is subjected to the outward spreading force, the force to the surrounding flesh and skin tissue is uniform, the damage to the flesh and skin tissue is reduced as much as possible, after the retraction spring 2 is spread to a certain extent, the space of the central position of the utility model is enlarged, the treatment tube 9 or the operation needle is allowed to enter, the operation is carried out along the retraction spring 2 to the position to be treated, when the skin and flesh tissues are retracted, the wound is small, therefore, the healing is faster after the treatment, the purpose of minimally invasive treatment is achieved, the spinal surgical treatment is generally performed by puncturing from the back or the side of the human body, and the puncture part is ensured to be loose when the human body lies on a sickbed during puncturing and retracting.
As shown in fig. 2 and 3, an elastic cylindrical membrane 1 is sleeved on the outer surface of the retraction spring 2, and the cylindrical membrane 1 is a medical silicon membrane.
If the outer surface of the retraction spring 2 is in direct contact with the skin and flesh tissues, a vertical sideline exists on the cylindrical outer surface of the spring, so that the relative sliding between the outer surface of the spring and the skin and flesh tissues can be generated in the opening process, the relative sliding between the sharp edge and the skin and flesh tissues is inevitable in the puncture process, but the relative sliding between the skin and flesh tissues and foreign matters can be avoided in the retraction process, and the spring reed is a metal part, so that the skin and flesh tissues can stimulate cells and cause local position discomfort if the skin and flesh tissues are in contact with the spring and relatively slide in the retraction process, therefore, the cylindrical membrane 1 is still kept at the circumferential position by arranging the cylindrical membrane 1 on the outer surface of the retraction spring 2, and the cylindrical membrane 1 is radially propped open and has elasticity and can not be cracked, skin meat tissue is when being strutted, keep the contact with cylinder membrane 1 same position, the degree that oozing appears in the process of strutting reduces greatly, and, because cylinder membrane 1 keeps constantly with the contact of puncture position skin meat, theoretically there is not skin meat tissue direct and air contact, it is possible to reduce the air oxidation, at the process of retracting, skin meat tissue also probably is extruded foreign matter such as fat granule, if, be two claws, the retractor of three-jaw pincers class, not only have skin meat tissue direct and air contact, the pollution probability increases, and, fat granule on the puncture tangent plane if being extruded at the process of retracting, can fall the operation position, influence the operation and go on, also be inconvenient to take out, cause many surgical problems. The silica gel membrane is breathable, water-repellent, good in skin-friendly property and good in elasticity, and blood seepage is not prone to occur and is not prone to be adhered to the cylindrical membrane 1.
As shown in fig. 4 and 5, the pulling-open forceps 3 comprises a front arm 33, a forceps shaft 32 and a rear arm 35, wherein two front arms 33 and two rear arms 35 are respectively arranged, the front arm 33 and the rear arm 35 on the same side are connected, and the joint of the front arm 33 and the rear arm 35 is hinged with the forceps shaft 32. The rear arm 35 is held by hands, in an initial position, the two front arms 33 are close to each other, the rear arm 35 is opened, the heads of the front arms 33 are vertically inserted into the retraction spring 2, the rear arm 35 is manually extruded, the rear arms 35 are closed, the front arms 33 are opened, the retraction spring 2 is opened, and the opening degree is controlled by the opening degree of the front arms 33.
As shown in fig. 4 to 6, the retracting forceps 3 further includes a spiral spring 34, at least one set of front arm 33 and rear arm 35 are connected by the spiral spring 34, the axis of the spiral spring 34 coincides with the axis of the forceps shaft 32, one end of the spiral spring 34 is connected to the front arm 33, the other end is connected to the rear arm 35, and the elasticity of the spiral spring 34 is greater than that of the retracting spring 2.
As shown in fig. 6, the front arm 33 is connected to the caliper shaft 32 by a hinge ring 331, the front arm rotates around the caliper shaft 32, the rear arm is also hinged by a similar ring structure, a point on the circumference of the hinge ring 331 is connected to the outer end of the spiral spring 34, i.e., the first connection 341, the inner end of the spiral spring 34, i.e., the second connection 342, is connected to the ring hinge structure of the rear arm 35, and when the rear arm 35 rotates around the caliper shaft 32, the second connection 342 is pulled to rotate, the spiral spring 34 winds up the loading elastic force, so that the first connection 341 drives the front arm 33 to rotate. As shown in fig. 5, after the rear arm 33 is squeezed together, the front arm 33 reaches the desired position of the solid line from the position of the broken line, which is slower than the closing speed of the rear arm 33.
The scroll spring 34 is added, when the rear arm 35 is manually pressed, the front arm 33 does not immediately rotate to the expected position, but moves against the expanding resistance of the retracting spring 2 under the elastic force of the scroll spring 34, the scroll spring 34 is a spring with fixed elastic force, the elastic force is irrelevant to the stroke, therefore, even if the force borne by the rear arm 35 when the rear arm is closed is large, the force of the scroll spring 34 for driving the front arm 33 to open is a determined value, the force for driving the front arm 33 to open is determined by the elastic modulus of the scroll spring 34, the elastic force of the scroll spring 34 is larger than the expanding resistance of the retracting spring 2, the force is larger, the retracting is faster, but the discomfort of the wounded is larger, the degree that the elastic modulus of the scroll spring 34 is reasonably larger than that of the retracting spring 2 can control the retracting force of the skin and flesh tissues at the puncture position, and under the condition of ensuring the retracting purpose, the discomfort of the injured is reduced, and the hand force and the forearm 33 opening force of the user are isolated by the scroll spring 34, so that the influence of the user's manipulation can be eliminated.
As shown in fig. 5 and 7, the pulling-apart forceps 3 further includes ratchet teeth 36 and door-shaped buckles 37, wherein the side surfaces of the rear arms 35 far away from each other are respectively provided with a plurality of symmetrical ratchet teeth 36, the ratchet teeth 36 are distributed along the length direction of the rear arms 35, the door-shaped buckles 37 are a plurality of door-shaped nails with different widths, and the door-shaped buckles 37 are inserted into the ratchet teeth 36. The door buckle 37 is shaped like a staple and is a set of several parts having different widths, and when the rear arm 35 is closed to a desired position, the door buckle 37 is buckled into the ratchet 36 to prevent the rear arm 35 from being opened and the front arm 33 from being closed when the hand is released. Ratchet 36 cooperates with a door catch 37 to effect locking of the position of the rear arm 35.
The compression elasticity of the spiral spring 34 is 3-6N greater than the opening resistance of the retraction spring 2. The force of 3-6 cattle can just retract skin and meat tissues without causing discomfort.
As shown in FIGS. 2 to 4, the front arm 33 is provided with a sliding protrusion 31 at a portion thereof inserted into the retraction spring 2. When the front arm 33 is expanded to expand the retraction spring 2, the end thereof slides relative to the inner wall of the retraction spring 2, and the sliding projection 31 improves the sliding condition.
The main use process of the device is as follows: the handheld retracting forceps 3 enable the retracting spring 2 with the cylindrical membrane 1 on the outer wall of the retracting spring to penetrate into skin and flesh tissues to reach an expected operation position, the rear arm 35 is squeezed to enable the retracting spring to be folded, the spiral spring 34 is loaded in an elastic mode, the front arm 33 is driven to rotate so as to unfold the retracting spring 2, the treatment tube 9 extends into the operation position along the center of the retracting spring 2 to perform treatment, after the treatment is completed, the retracting spring 2 is loosened to enable the retracting spring 2 to be folded and wound, then the retracting spring 2 and the cylindrical membrane 1 are drawn out, and the wound of the puncture position is wrapped.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (6)
1. An annular minimally invasive retractor for surgery, characterized in that: the retractor comprises a retracting spring (2) and retracting forceps (3), the retracting spring (2) is a sheet clockwork spring, the axial lower part of the retracting spring (2) is bent towards an axis to form a conical puncture sharp edge (21), the head of the retracting forceps (3) is inserted into the retracting spring (2) from the axial upper end of the retracting spring (2), and the retracting spring (2) is unfolded from inside to outside by the retracting forceps (3) to complete the retracting action of the operation position;
the outer surface of the retraction spring (2) is sleeved with an elastic cylindrical membrane (1), and the cylindrical membrane (1) is a medical silicon membrane.
2. The surgical annular minimally invasive retractor according to claim 1, wherein: the distraction forceps (3) comprise a front arm (33), a forceps shaft (32) and a rear arm (35), wherein the front arm (33) and the rear arm (35) are respectively two, the front arm (33) and the rear arm (35) on the same side are connected, and the joint of the front arm (33) and the rear arm (35) is hinged to the forceps shaft (32).
3. A surgical annular minimally invasive retractor according to claim 2, wherein: the retracting forceps (3) further comprise a volute spiral spring (34), at least one group of front arm (33) and rear arm (35) are connected through the volute spiral spring (34), the axis of the volute spiral spring (34) coincides with the axis of the forceps shaft (32), one end of the volute spiral spring (34) is connected with the front arm (33), the other end of the volute spiral spring is connected with the rear arm (35), and the elastic force of the volute spiral spring (34) is larger than that of the retracting spring (2).
4. A surgical annular minimally invasive retractor according to claim 3, wherein: the pulling-open forceps (3) further comprise ratchets (36) and door-shaped buckles (37), a plurality of symmetrical ratchets (36) are respectively arranged on the side faces, far away from each other, of the rear arms (35), the ratchets (36) are distributed along the length direction of the rear arms (35), the door-shaped buckles (37) are a plurality of door-shaped nails with different widths, and the door-shaped buckles (37) are inserted into the ratchets (36).
5. A surgical annular minimally invasive retractor according to claim 3, wherein: the compression elasticity of the volute spiral spring (34) is 3-6 newtons greater than the opening resistance of the retraction spring (2).
6. The surgical circular minimally invasive retractor according to claim 2, wherein: the part of the front arm (33) inserted into the retraction spring (2) is provided with a sliding bulge (31).
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| CN202010675241.1A CN111803152B (en) | 2020-07-14 | 2020-07-14 | Surgical annular minimally invasive retractor |
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| CN202010675241.1A CN111803152B (en) | 2020-07-14 | 2020-07-14 | Surgical annular minimally invasive retractor |
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