CN210673333U - Automatic micro-incision peripheral blood sampler - Google Patents

Abstract

The application discloses automatic little incision formula tip hemostix includes: the shell is provided with a clamping groove and a notch and comprises a lower shell and an upper shell which are connected; the starting mechanism is arranged on the clamping groove; and an actuator located at the lower shell; the actuator includes: a cutter holder having a cutter blade at a lower end thereof; the tool apron cabin is sleeved on the tool apron; the upper end of the cutter holder is separably connected with the lower end of the starting mechanism, and when the upper end of the cutter holder is separated from the lower end of the starting mechanism, the cutter holder slides along the parabolic curve of the cutter cabin, so that the blade is ejected out of the notch. The blade punctures the peripheral part of the patient to take blood, the operation is simple, and the blood can be taken without experience and technical skills.

Description

Automatic micro-incision peripheral blood sampler

Technical Field

The application relates to the technical field of medical instruments, in particular to an automatic micro-incision peripheral blood collector.

Background

Blood collection devices are widely used by various medical institutions as a tool. The existing peripheral blood collector generally adopts a needle type, the blood collection quantity and the blood collection quality mostly depend on the experience and the technical method of blood collection personnel, and the operation difficulty is higher. Therefore, there is a need for an automatic micro-incision blood collection device that can collect blood easily and without experience and technical skill.

SUMMERY OF THE UTILITY MODEL

It is an object of the present application to overcome the above problems or to at least partially solve or mitigate the above problems.

According to an aspect of the present application, there is provided an automatic micro-incision type distal blood collector, comprising: the shell is provided with a clamping groove and a notch and comprises a lower shell and an upper shell which are connected; the starting mechanism is arranged on the clamping groove; and an actuator located at the lower shell; the actuator includes: a cutter holder having a cutter blade at a lower end thereof; the tool apron cabin is sleeved on the tool apron; the upper end of the cutter holder is separably connected with the lower end of the starting mechanism, and when the upper end of the cutter holder is separated from the lower end of the starting mechanism, the cutter holder slides along the parabolic curve of the cutter cabin, so that the blade is ejected out of the notch.

Optionally, the starting mechanism includes a key, a key bin and a key compression spring connected together: the top of the key bin is provided with an opening, the lower part of the key bin is provided with a bottom plate, the upper surface of the bottom plate is provided with a first fixing column, the key bin is provided with symmetrical limiting through grooves, the key bin is provided with symmetrical through holes, the upper edge of each through hole is provided with a first lug and a second lug which are downward, and the inner sides of the first lug and the second lug are provided with first inclined planes; the first lug and the second lug are symmetrically arranged.

Optionally, the limiting through groove and the through hole are arranged at intervals, and a gap is formed between the first protruding piece and the second protruding piece.

Optionally, the top inner wall of button is equipped with the second fixed column the lower part symmetry of button is equipped with first inserted sheet and second inserted sheet, first inserted sheet with the second inserted sheet interval sets up the outer wall of first inserted sheet is equipped with first joint portion the outer wall middle part of second inserted sheet is equipped with second joint portion the both sides of second joint portion all are equipped with the second inclined plane.

Optionally, the second tab is rectangular, and the side of the first tab is provided with a chamfer.

Optionally, the upper end of the key pressure spring is sleeved with the second fixing column, and the lower end of the key pressure spring is sleeved with the first fixing column.

Optionally, the tool holder comprises: a first cylindrical structure and a second cylindrical structure arranged in parallel; the long pin shaft penetrates through and is fixedly connected with the first cylindrical structure; the short pin shaft is fixedly connected with the second cylindrical structure through a blind hole; one end of each symmetrically arranged frame is connected with the first cylindrical structure, and the other end of each symmetrically arranged frame is connected with the second cylindrical structure; one ends of the symmetrically arranged inclined rods are connected with the first cylindrical structure, and the other ends of the symmetrically arranged inclined rods are provided with inward hooks; one end of the reinforcing rib is connected with the first cylindrical structure, and the other end of the reinforcing rib is connected with the second cylindrical structure; the vertical beam is constructed on the frame and the reinforcing ribs, and a fixing ring is arranged in the middle of the vertical beam; one end of the driving spring is connected with the fixing ring, and the other end of the driving spring is connected with the lower shell; the blade is fixed in the middle of the second cylindrical structure, and the frame and the inclined rod form an included angle.

Optionally, the frame, the inclined rod, the reinforcing rib, the first cylindrical structure, the second cylindrical structure, the vertical beam, and the fixing ring are integrally formed.

Optionally, the interior of the tool cabin is a cavity structure, two ends of the tool cabin are provided with openings, and two side surfaces of the tool cabin are symmetrically provided with a first parabolic through groove and a second parabolic through groove.

Optionally, the blade is triangular.

The utility model provides an automatic little incision formula tip hemostix, which comprises an outer shell, it has draw-in groove and notch, the shell is including the inferior valve and the epitheca that are connected, actuating mechanism sets up in the draw-in groove, actuating mechanism is located the inferior valve, actuating mechanism includes the blade holder, its lower extreme has the blade, blade holder cabin suit is in the blade holder, the upper end of blade holder and actuating mechanism's lower extreme detachable be connected, when the upper end of blade holder and actuating mechanism's lower extreme separation, the blade holder slides along blade holder cabin parabola, make the blade pop out in the notch, the blade punctures blood sampling patient's tip position blood sampling, and the operation is simple, need not experience and technique gimmic.

The above and other objects, advantages and features of the present application will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.

Drawings

Some specific embodiments of the present application will be described in detail hereinafter by way of illustration and not limitation with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:

FIG. 1 is a schematic structural diagram of the interior of an automated micro-incision peripheral blood collection device according to one embodiment of the present application;

FIG. 2 is a schematic side view of a key magazine of the activation mechanism of the automatic micro-incision peripheral blood collection device of FIG. 1;

FIG. 3 is a schematic bottom view of the key magazine of the activation mechanism of the automatic micro-incision peripheral blood collection device of FIG. 2;

FIG. 4 is a schematic perspective view of a key magazine of the activation mechanism of the automatic micro-incision peripheral blood collection device of FIG. 3;

FIG. 5 is a schematic bottom view of the button of the activation mechanism of the automatic micro-incision peripheral blood collection device of FIG. 1;

FIG. 6 is a schematic perspective view of the button of the activation mechanism of the automatic micro-incision type peripheral blood collection device shown in FIG. 5;

FIG. 7 is a schematic bottom view of the cartridge of the activation mechanism of the automatic micro-incision peripheral blood collection device of FIG. 1;

FIG. 8 is a schematic top view of the cartridge of the activation mechanism of the automatic micro-incision peripheral blood collection device of FIG. 7;

FIG. 9 is a schematic side view of the cartridge of the activation mechanism of the automatic micro-incision peripheral blood collection device of FIG. 8;

FIG. 10 is a first schematic perspective view of the knife compartment of the actuating mechanism of the automatic micro-incision peripheral blood collection device of FIG. 1;

fig. 11 is a second schematic perspective view of the knife cabin of the activating mechanism of the automatic micro-incision type peripheral blood collection device shown in fig. 1.

The labels in the figure are:

1-a lower shell; 2-pressing a key; 201-a first insert sheet; 202-a second insert sheet; 203-second fixed columns; 204-a second clamping part; 205-a second inclined surface; 206-a first clamping part; 3-a key bin; 301-a first inclined surface; 302-a first fixed column; 303-limiting through grooves; 304-open mouth; 305-a backplane; 306-a via; 307-a first tab; 308-a second tab; 309-gap; 310-chamfering; 4-press key compression spring; 5-a tool apron; 501-hanging hooks; 502-a border; 503-tilting bar; 504-reinforcing ribs; 505-vertical beams; 506-a fixed ring; 507-a first cylindrical structure; 508-a second cylindrical structure; 6-knife cabin; 61-a first parabolic trough; 62-a second parabolic trough; 63-opening; 7-a blade; 8-short pin shaft; 9-long pin shaft; 10-a drive spring; 12-notches; 13-a card slot; 100-a starting mechanism; 200-an actuator.

Detailed Description

Referring to fig. 1, an automated micro-incision peripheral blood collection device may generally include a housing, an activation mechanism 100, and an actuator mechanism 200. Wherein the housing, which has a card slot 13 and a notch 12, comprises a lower shell 1 and an upper shell (not shown in the figure) which are connected. Actuating mechanism 100 is disposed within card slot 13. An actuator 200 is located in the lower case 1, and the actuator 200 may generally include a holder 5 and a holder compartment 6, the holder 5 having a blade 7 at a lower end thereof, the holder compartment 6 being fitted over the holder 5. Specifically, the upper end of the cutter holder 5 is separably connected with the lower end of the starting mechanism 100, when the upper end of the cutter holder 5 is separated from the lower end of the starting mechanism 100, the cutter holder 5 slides along the cutter holder cabin 6 in a parabolic manner, so that the blade 7 is ejected out of the notch 12, the blade 7 punctures the peripheral part of a blood sampling patient to sample blood, the operation is simple, and the blood sampling can be performed without experience and technical skills.

In the above embodiment, optionally, the lower shell 1 and the upper shell may be clamped or screwed, and the connection is firm, and the lower shell 1 and the upper shell are made of plastic materials. The shape of the shell is a rectangular body or a round body, and the shell is convenient to hold by hands. The slot 13 is circular or square to facilitate mounting to the actuating mechanism 100, and the notch 12 is rectangular or circular to facilitate ejection of the blade 7. The actuating mechanism 100 and the actuator 200 are both made of plastic, and the blade 7 is made of stainless steel.

Referring to fig. 1, 2, 3 and 4, an activation mechanism 100 may generally include a key 2, a key magazine 3 and a key compression spring 4 connected according to one embodiment of the present application. The top of the key bin 3 is provided with an opening 304, the lower part of the key bin 3 is provided with a bottom plate 305, the upper surface of the bottom plate 305 is provided with a first fixing column 302, the key bin 3 is provided with symmetrical limiting through grooves 303, the key bin 3 is provided with symmetrical through holes 306, the upper edge of the through hole 306 is provided with a downward first lug 307 and a downward second lug 308, the inner sides of the first lug 307 and the second lug 308 are both provided with a first inclined surface 301, and the first lug 307 and the second lug 308 are both symmetrically arranged. The limiting through groove 303 is arranged at an interval with the through hole 306, and a gap 309 is arranged between the first lug 307 and the second lug 308. The first fixing post 302 is a cylinder.

Specifically, the lower part of the key 2 extends to the inside of the key chamber 3 from the opening 304, the first clamping portion 206 of the outer wall of the first insertion piece 201 of the key 2 is located in the limiting through groove 303, the second clamping portion 204 of the outer wall of the second insertion piece 202 is located at the position of the through hole 306, and the lower end of the key pressure spring 4 is sleeved on the first fixing column 302. Through the upper portion of pressing button 2, first inclined plane 301 and second inclined plane 205 sliding contact make the adduction of second inserted sheet 202, and then make second joint portion 204 and couple 501 unhook, easy operation, rational in infrastructure.

In the above embodiment, further, the shape and size of the opening 304 is matched with the shape and size of the key 2, so as to avoid the occurrence of unsmooth operation. The bottom plate 305, the first fixing column 302, the side part of the key bin 3, the first protruding piece 307 and the second protruding piece 308 are integrally formed, so that damage caused by pressing the key 2 is avoided, and blood sampling failure is avoided. The second protruding piece 308 is rectangular, the side surface of the first protruding piece 307 is provided with a chamfer 310, and when the second clamping portion 204 is unhooked from the hook 501, the tool holder 5 can slide parabolically along the inclination angle of the chamfer 310, so that the sliding effect of the tool holder 5 is improved.

Referring to fig. 5 and 6, according to an embodiment of the present application, a second fixing column 203 is disposed on an inner wall of a top portion of the key 2, a first insertion sheet 201 and a second insertion sheet 202 are symmetrically disposed on a lower portion of the key 2, the first insertion sheet 201 and the second insertion sheet 202 are disposed at an interval, a first clamping portion 206 is disposed on an outer wall of the first insertion sheet 201, a second clamping portion 204 is disposed in a middle portion of an outer wall of the second insertion sheet 202, and second inclined planes 205 are disposed on two sides of the second clamping portion 204.

Specifically, the upper end of the key pressure spring 4 is sleeved on the second fixing column 203, so that elastic force is generated, the key 2 is made to rebound after being pressed down, and the operation is facilitated.

In the above embodiment, optionally, the first insertion sheet 201 and the second insertion sheet 202 are not connected, so that when the key 2 is pressed, the second insertion sheet 202 is retracted under the force of the first inclined surface 301, and thus the second clamping portion 204 and the hook 501 can be unhooked.

In the above embodiment, optionally, the second fixing column 203 is a cylinder, and the cross section of the second clamping portion 204 is triangular, so that the second clamping portion can be hooked with the hook 501, the clamping effect is good, and the separation is convenient. The cross-section of first joint portion 206 is triangle-shaped just so can block along with spacing logical groove 303, and the joint is effectual.

With reference to fig. 7, 8 and 9, according to an embodiment of the present application, the insert seat 5 comprises a first cylindrical structure 507 and a second cylindrical structure 508 arranged in parallel; the long pin shaft 9 is connected with the first cylindrical structure 507 in a penetrating and fastening mode. The short pin shaft 8 is fixedly connected with the second cylindrical structure 508 through a blind hole; the symmetrically disposed frame 502 has one end connected to the first cylindrical structure 507 and the other end connected to the second cylindrical structure 508. Symmetrically arranged inclined rods 503, one end of which is connected with the first cylindrical structure 507 and the other end of which is provided with an inward hook 501; the reinforcing bar 504 is connected at one end thereof to the first cylindrical structure 507 and at the other end thereof to the second cylindrical structure 508. The vertical beam 505 is configured with the frame 502 and the reinforcing rib 504, and a fixing ring 506 is provided in the middle of the vertical beam 505. The driving spring 10 has one end connected to the fixing ring 506 and the other end connected to the lower case 1. Wherein, the blade 7 is fixed in the middle of the second cylindrical structure 508, and the frame 502 forms an included angle with the inclined rod 503.

Specifically, when the hook 501 is separated from the second clamping portion 204, the short pin shaft 8 slides in the first parabolic through groove 61, and the long pin shaft 9 slides in the second parabolic through groove 62, so that the knife holder 5 slides in a parabolic manner in the knife holder compartment 6, and the blade 7 is ejected out of the notch 12 to take blood, which is convenient to operate. Of course, the hook 501 may also be reconnected to the second snap-in portion 204, with the tool holder 5 stationary inside the tool holder compartment 6, so that the insert 7 is retracted in the slot 12.

In the above embodiment, optionally, the frame 502, the inclined rod 503, the reinforcing rib 504, the first cylindrical structure 507, the second cylindrical structure 508, the vertical beam 505, and the fixing ring 506 are integrally formed, so that the firmness is better. The blade 7 is triangular, so that micro-cutting is facilitated.

Referring to fig. 10 and 11, according to an embodiment of the present application, the interior of the blade holder compartment 6 is a cavity structure, both ends of the cavity structure have openings 63, and a first parabolic through groove 61 and a second parabolic through groove 62 are symmetrically arranged on both lateral surfaces of the blade holder compartment 6.

Specifically, the tool apron cabin 6 is sleeved in the middle of the tool apron 5, the tool apron cabin 6 is fixedly connected with the lower shell 1 through a bolt or clamped, and the tool apron 5 can slide in the tool apron cabin 6 as long as the tool apron cabin 6 is fixed.

In the above embodiment, optionally, the size of the opening 63 and the cavity structure is slightly larger than that of the blade holder 5, so as to avoid a large collision with the blade holder compartment 6 when the blade holder 5 slides, and further improve the parabolic effect of the blade holder 5.

When in specific use:

the shell is formed by buckling an upper shell and a lower shell 1, the starting mechanism 100, the executing mechanism 200, the driving spring 10 and the blade 7 are correspondingly arranged in the shell, the key 2 part of the starting mechanism 100 is exposed out of the shell to start automatic blood sampling, the blade 7 is rapidly withdrawn after being extended out from a notch 12 corresponding to the shell by taking a parabola as a route under the combined action of the starting mechanism 100, the executing mechanism 200 and the driving spring 10, a micro-cut is formed at a corresponding peripheral blood sampling part, and blood drops seep out along with the micro-cut. The micro-incision automatic blood sampling device is simple in structure, rapid and powerful in action, simple and direct, and capable of automatically completing micro-incisions at one time, so that dependence on experience and technical skills of blood sampling personnel is reduced, and blood sampling efficiency and blood sampling quality are improved.

1. The starting mechanism 100 comprises a key 2, a key bin 3 and a key pressure spring 4, the starting mechanism 100 can exist in an independent part form, assembly can be carried out after independent assembly is completed, the structure is compact, the action is stable, assembly can be carried out step by step in production and assembly, and the efficiency is obviously improved.

2. The executing mechanism 200 comprises a cutter holder 5, a blade 7, a cutter holder cabin 6, a long pin shaft 9 and a short pin shaft 8, the blade 7 and the cutter holder 5 are molded together, the structure is simple, the working procedures are saved, the efficiency is improved, the executing mechanism can exist in an independent part form, assembly can be carried out after independent assembly is finished, the structure is compact, the action is stable, and the efficiency can be obviously improved by step assembly in production and assembly.

3. In the actuating mechanism 200, the hook 501 of the tool apron 5 is hooked with the second clamping part 204 of the key 2 before starting, and is released after starting, so that the action is rapid and reliable. The actuating mechanism has simple structure, fast motion and fast action, and the force value is ensured.

4. The lower end of the driving spring 10 is sleeved on the corresponding fixing column of the lower shell 1, the driving spring 10 is in a long stretching energy storage state before starting, and is in a short stretching tensioning state after starting. The spring arrangement has stable and reliable connection, direct force application and guaranteed force value and speed. This arrangement ensures that the blade 7 remains tensioned after being pulled back into the housing and is thus reliably secured against danger from extending outside the housing, ensuring safety and reliability.

5. Human engineering has been considered to shell molding and size, and the operator of being convenient for one hand grips, holds steadily still comfortable, and the operation is light, because control easily and stable, is strong in improving blood sampling efficiency, and the shell molding has still been compromise simultaneously beautifully, and the appearance is mellow and lovely, enjoys for the nice vision of patient to dispersion attention alleviates the sense of pain.

It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which this application belongs.

In the description of the present application, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.

Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present application, "a plurality" means two or more unless specifically defined otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

The above description is only for the preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. An automatic microtome-style peripheral blood sampler, comprising:

a housing having a card slot (13) and a slot (12), the housing comprising a lower shell (1) and an upper shell connected;

an actuating mechanism (100) provided to the card slot (13); and

an actuator (200) located at the lower shell (1);

the actuator (200) comprises:

a tool holder (5) having a blade (7) at a lower end thereof; and

a tool apron cabin (6) sleeved on the tool apron (5);

wherein the upper end of the tool apron (5) is detachably connected with the lower end of the starting mechanism (100), and when the upper end of the tool apron (5) is separated from the lower end of the starting mechanism (100), the tool apron (5) slides along the parabola of the tool cabin (6) so that the blade (7) is ejected out of the notch (12).

2. The automatic micro-incision peripheral blood collector according to claim 1, wherein the activation mechanism (100) comprises a key (2), a key chamber (3) and a key compression spring (4) connected:

the top of the key bin (3) is provided with an opening (304), the lower part of the key bin is provided with a bottom plate (305), the upper surface of the bottom plate (305) is provided with a first fixing column (302), the key bin (3) is provided with symmetrical limiting through grooves (303), the key bin (3) is provided with symmetrical through holes (306), the upper edge of the through hole (306) is provided with a downward first protruding piece (307) and a second protruding piece (308), and the inner sides of the first protruding piece (307) and the second protruding piece (308) are both provided with a first inclined plane (301); the first tab (307) and the second tab (308) are symmetrically arranged.

3. The automated micro-notched peripheral blood collector of claim 2, wherein;

the limiting through groove (303) and the through hole (306) are arranged at intervals, and a gap (309) is formed between the first protruding piece (307) and the second protruding piece (308).

4. The automated micro-notched peripheral blood collector of claim 2, wherein:

the top inner wall of button (2) is equipped with second fixed column (203) the lower part symmetry of button (2) is equipped with first inserted sheet (201) and second inserted sheet (202), first inserted sheet (201) with second inserted sheet (202) interval sets up the outer wall of first inserted sheet (201) is equipped with first joint portion (206) the outer wall middle part of second inserted sheet (202) is equipped with second joint portion (204) the both sides of second joint portion (204) all are equipped with second inclined plane (205).

5. The automated micro-notched peripheral blood collector of claim 2, wherein:

the second protruding piece (308) is rectangular, and the side face of the first protruding piece (307) is provided with a chamfer (310).

6. The automated micro-notched peripheral blood collector of claim 4, wherein:

the upper end of the key pressure spring (4) is sleeved with the second fixing column (203), and the lower end of the key pressure spring (4) is sleeved with the first fixing column (302).

7. The automated micro-notched peripheral blood collector of claim 1, wherein:

the holder (5) comprises:

a first cylindrical structure (507) and a second cylindrical structure (508) arranged in parallel;

a long pin shaft (9) which is fixedly connected with the first cylindrical structure (507) in a penetrating way;

a short pin shaft (8) which is fixedly connected with the second cylindrical structure (508) in a blind hole;

symmetrically arranged rims (502) having one end connected to the first cylindrical structure (507) and the other end connected to the second cylindrical structure (508);

symmetrically arranged inclined rods (503), one end of which is connected with the first cylindrical structure (507), and the other end of which is provided with an inward hook (501);

a reinforcement rib (504) connected at one end to said first cylindrical structure (507) and at the other end to said second cylindrical structure (508);

a vertical beam (505) which is configured on the frame (502) and the reinforcing rib (504), wherein a fixing ring (506) is arranged in the middle of the vertical beam (505);

a driving spring (10) having one end connected to the fixing ring (506) and the other end connected to the lower case (1);

the blade (7) is fixed in the middle of the second cylindrical structure (508), and an included angle is formed between the frame (502) and the inclined rod (503).

8. The automated micro-notched peripheral blood collector of claim 7, wherein:

the frame (502), the inclined rod (503), the reinforcing rib (504), the first cylindrical structure (507), the second cylindrical structure (508), the vertical beam (505), and the fixing ring (506) are integrally formed.

9. The automated micro-notched peripheral blood collector of claim 1, wherein:

the interior of the tool cabin (6) is of a cavity structure, openings (63) are formed in two ends of the tool cabin, and a first parabolic through groove (61) and a second parabolic through groove (62) are symmetrically formed in two side faces of the tool cabin (6).

10. The automated micro-incision peripheral blood collector of claim 1 or 7, wherein:

the blade (7) is triangular.

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