阅读说明：本技术 一种自解锁妇产科产钳 (A kind of Self-unlocking gynemetrics obstetric forceps ) 是由 赵丽君 于 2019-09-23 设计创作，主要内容包括：本发明涉及医疗器械技术领域,提供了一种自解锁妇产科产钳,包括由连杆结构与动力轴连接组成的夹持传动组件,由外棘轮、内棘轮和弹簧棘齿组成的牵引防护组件,夹持传动组件与夹持组件连接完成远端控制工作,牵引防护组件与握持组件连接形成牵引力上限保护。本发明通过简单稳定的结构一方面实现了夹持动作的远端控制,另一方面通过牵引防护组件形成了可预设牵引力上限的脱钩保护机制并使得脱钩机制触发后夹持组件恢复至初始张开角度。(The present invention relates to the field of medical instrument technology; provide a kind of Self-unlocking gynemetrics obstetric forceps; including the clamping transmission component being made of link mechanism and power axis connection; the traction guard assembly being made of outer ratchet, handle ratchet wheel and spring ratchet; clamping transmission component is connect with clamp assemblies completes remote control work, and traction guard assembly connect to form tractive force upscale protection with grip component.On the one hand the present invention realizes the remote control of holding action by the structure of simple and stable, clamp assemblies after can presetting the unhook protection mechanism of the tractive force upper limit and unhook mechanism being triggered on the other hand are formd by traction guard assembly and are restored to initial opening angle.)

1. a kind of Self-unlocking gynemetrics obstetric forceps, including shell support component (1), grip component (2) and clamp assemblies (4), special Sign is that the clamp assemblies (4) fix company with the clamping transmission component (3) formed is connect with line shaft (31) by link mechanism It connects, described grip component (2) one end and the traction protection group being made of outer ratchet (51), handle ratchet wheel (52) and spring ratchet (55) Part (5) installation connection, the outer ratchet (51) are installed with handle ratchet wheel (52) via spring ratchet (55) are nested, the line shaft (31) other end is connect with the grip component (2).

2. a kind of Self-unlocking gynemetrics obstetric forceps according to claim 1, which is characterized in that the shell support component (1) Including front end panel (11) and rear bearing sheet (12), there are kidney slot in the front end panel (11) and rear bearing sheet (12) rear end (13), there is hinge hole (14) in front end and has the baffle (15) of baffle through-hole (151) to be fixedly mounted respectively at middle part and centre, and Front end panel (11) has adjusting knob mounting hole (111) at front end.

3. a kind of Self-unlocking gynemetrics obstetric forceps according to claim 1, which is characterized in that the grip component (2) includes Holding rod (21), holding rod (21) lower end are grip part (215), and upper end is promotion part (216), the promotion part (216) Top is provided with fixture block (2161), and being internally provided with is trigger cavity (214), left and right below cylindrical cavity (211) and end End face has positioning protruding shaft (212) respectively, and there is mounting ear in promotion part (216) end face at left and right sides of the trigger cavity (214) Plate (213), and the installation otic placode (213) end is the first mounting hole (2131), the positioning protruding shaft (212) of the left and right end face It is movably installed in the kidney slot (13) of front end panel (11) and rear bearing sheet (12) respectively.

4. according to claim 1 or a kind of Self-unlocking gynemetrics obstetric forceps as claimed in claim 3, which is characterized in that the gripping Component (2) further includes trigger quarter butt (22), and trigger quarter butt (22) top is positioning surface (223), and lower end is operating surface (222), centre has the second mounting hole (221), and the trigger quarter butt (22) passes through trigger cavity (214), the positioning surface (223) It is internal to be installed on cylindrical cavity (211), second mounting hole (221) passes through the first pin shaft (24) and the first mounting hole (2131) Rotation connection, the operating surface (222) are connect by first back-moving spring (23) with grip part (215), the grip component (2) It further include buffer spring (25), one end is fixedly installed in kidney slot (13) terminal surface, and the other end is fixedly installed in positioning protruding shaft (212).

5. a kind of Self-unlocking gynemetrics obstetric forceps according to claim 1, which is characterized in that the outer ratchet (51) includes outer Ratchet body (511) and the outer arm of ratchet (512) of the bending structure for being located at outer Ratchet body (511) upper end, the outer ratchet Main body (511) center is ratchet cavity (5112), and lower part is cylinder cavity (5111), and the handle ratchet wheel (52) includes handle ratchet wheel master Body (521) and the bending structure handle ratchet wheel arm (522) for being located at handle ratchet wheel main body (521) lower end, the spring ratchet (55) Including spring portion (552), spring portion (552) upper end is fixedly connected with ratchet (551), lower end and column contact portion (553) it is fixedly connected, the spring ratchet (55) is installed on handle ratchet wheel main body (521) internal cavities, and the ratchet (551) from the first ratchet hole (5211) on handle ratchet wheel main body (521) surface stretch out, the handle ratchet wheel main body (521) with It is internal that spring ratchet (55) is installed on ratchet cavity (5112), and the handle ratchet wheel arm (522) is stretched out from cylinder cavity (5111).

6. a kind of Self-unlocking gynemetrics obstetric forceps according to claim 5, which is characterized in that the outer Ratchet body (511) With handle ratchet wheel main body (521) consistency of thickness, and its left and right ends is interior with front end panel (11) and rear bearing sheet (12) respectively End face is close to, and there are perforative first movable slotted hole (5121), end or so end in position among outer arm of ratchet (512) surface Face has the first guide plate (513), and there is perforative second movable slotted hole (5221) at position among handle ratchet wheel arm (522) surface, Its end or so end face has the second guide plate (514), when outer ratchet (51), handle ratchet wheel (52) are engaged with spring ratchet (55) nesting When, first guide plate (513) and the lucky split of the second guide plate (514) inner face, and one or so guide board structures are formed, And fixture block (2161) first guide plate of Yu Suoshu (513), the second guide plate (514), handle ratchet wheel arm (522) end and outer arm of ratchet (521) the ladder cavity installation formed, and its end face is close to installation with the end face of block (15).

7. a kind of Self-unlocking gynemetrics obstetric forceps according to claim 1, which is characterized in that the traction guard assembly (5) It further include adjusting knob (53) and cam (54), the adjusting knob (53) is installed on handle ratchet wheel main body (521) outer end face center Place, and pass through adjusting knob mounting hole (111), and be installed in the cam (54) of handle ratchet wheel main body (521) internal cavities Mandrel is fixedly connected, cam (54) surface and column contact portion (553) tangent contact.

8. a kind of Self-unlocking gynemetrics obstetric forceps according to claim 1, which is characterized in that the link mechanism includes jacking block (32), L shape connecting rod (35) and shear arm (36), the jacking block (32) are lid shape structure, and bottom is blind hole (323), and top is There is the sheet link mounting feature (321) of third mounting hole (322) in centre, and there is connecting rod mounting hole at L shape connecting rod (35) both ends (351), there is shear arm mounting hole (361) in shear arm (36) rear end and its turning point is the first hinge hole (362), described to cut Tool arm mounting hole (361) and preceding end link mounting hole (351) are rotatablely connected by the second pin shaft (37), two sets of L shape connecting rods (35) It is rotatablely connected at rear end link mounting hole (351) by third pin shaft (38) and third mounting hole (322) with shear arm (36), And described two first hinge holes (362), therebetween lantern ring (6) and hinge hole (14) are connected by the rotation of the 4th pin shaft (39) It connects, separately there is third reset spring (34) connection jacking block (32) upper surface and outer ratchet (51) outer wall.

9. a kind of Self-unlocking gynemetrics obstetric forceps described in any one according to claim 1~8, which is characterized in that the power It is internal that axis (31) is movably installed in cylindrical cavity (211), and its front end passes through baffle through-hole (151), is installed on blind hole (323) Interior, line shaft (31) rear end face is contacted with positioning surface (223), and end face passes through second back-moving spring (33) and column thereafter The connection of cavity (211) end.

10. a kind of Self-unlocking gynemetrics obstetric forceps according to claim 1, which is characterized in that the clamp assemblies (4) include Metal splint (41), metal splint (41) appearance curve is approximate with fetus head, and is fixedly installed in shear arm (36) end, separately Flexible intermediate plate (42) is fixedly installed in the metal splint (41) middle inside and uses flexible buffer material.

Technical field

The invention belongs to the field of medical instrument technology, and in particular to a kind of Self-unlocking gynemetrics obstetric forceps.

Background technique

When women's spontaneous labor, along with various risks, generally for the difficult labour of head position, shortening second stage of labor is solved, as early as possible The problems such as terminal pregnancy, achievees the purpose that after the birth, mother and child were doing well, needs to produce using child birth assisting apparatus assist women.Currently used midwifery Equipment has vacuum extractor and Obstetric forceps, when using vacuum extractor, draws fetus head using negative pressure, assists delivery of baby Vagina, but negative pressure also easily causes fetal scalp tearing, scalp contusion and parent laceration of cervix, vulvovaginal lacerated wound, and serious person can Cause foetal death；Obstetric forceps are then that the blade to match by two plate shapes with fetus capitiform clasps fetus head, and soft Ground draws fetus, exposes fetal head, completion production of taking advantage of a situation.

Obstetric forceps used in clinic at present, more demanding to the operating experience of midwifery doctor, blade clamping force spends conference pair Fetus head and vagina cause to damage, and when clamping dynamics deficiency, Obstetric forceps are easy to slip, and scratch fetus head skin, very To causing further to have difficult labour；Pulling force is equally existed when clamping outer draw and controls improper problem, and pulling force is too small, it is difficult to draw fetal head It is exposed, extend puerpera's pregnant time, tractive force is excessive, then there is the risk for pulling fetal skin and puerpera's vagina, serious person is very Foetal death can extremely be caused；On the other hand, the blade of traditional Obstetric forceps is metal material, this hard material cures midwifery It is raw to be encountered by bigger problem in curable grip controlling party face.

Application No. is the patents of invention of CN201810356493.0 to propose a kind of high-performance flexible obstetric forceps, including the first pincers , the second pincers and blade, wherein the first pincers handle and the second pincers, hinged, the two end is respectively connected with the blade with buffer layer, And blade and the second pincers, being flexibly connected by articulated shaft, flexible connection is exceeding blade by layer of silica gel and spring It can be flared out when the power of default size, avoid clamping tension；This design effectively prevents pressing from both sides by easy mechanical structure Holding force is excessive to be damaged caused by fetus, but the control for clamping rear haulage power size is not related to.

Therefore, need to design that a kind of structure is simple, convenient for operation and can effectively reduce large traction and causes to fetus The Self-unlocking gynemetrics obstetric forceps of damage.

Summary of the invention

The purpose of the present invention is to provide a kind of Self-unlocking gynemetrics obstetric forceps, on the one hand pass through the mechanical structure of simple and stable It is reliably completed distal end clipping operation activity；On the other hand it when outside traction is firmly excessive, enables to retaining part and leads Draw position and realize unhook automatically, avoids the irreversible injury to fetus and puerpera.

In order to realize appeal purpose, technical solution provided by the present invention are as follows:

A kind of Self-unlocking gynemetrics obstetric forceps, including shell support component, grip component and clamp assemblies, the clamp assemblies with by Link mechanism is fixedly connected with the clamping transmission component that power axis connection is formed, described grip component one end with by outer ratchet, it is interior The traction guard assembly of ratchet and spring ratchet composition installs connection, and the outer ratchet is pacified with handle ratchet wheel via spring ratchet is nested Dress, the line shaft other end are connect with the grip component.

Further, the shell support component includes front end panel and rear bearing sheet, the front end panel and rear bearing sheet There is kidney slot in rear end, and there is hinge hole in front end and is fixedly mounted respectively at middle part and the intermediate baffle for having baffle through-hole, and preceding Support plate has adjusting knob mounting hole at front end.

Further, the grip component includes holding rod, and the holding rod lower end is grip part, and upper end is promotion part, institute It states and is provided with fixture block at the top of promotion part, be trigger cavity, left and right end face difference below internal setting cylindrical cavity and end There is positioning protruding shaft, the propulsion end surface at left and right sides of the trigger cavity has installation otic placode, and the installation otic placode end is The positioning protruding shaft of first mounting hole, the left and right end face is movably installed in respectively in the kidney slot of front end panel and rear bearing sheet.

Further, the grip component further includes trigger quarter butt, and trigger quarter butt top is positioning surface, and lower end is operation There are the second mounting hole in face, centre, and the trigger quarter butt passes through trigger cavity, and the positioning surface is installed on inside cylindrical cavity, institute It states the second mounting hole to be rotatablely connected by the first pin shaft and the first mounting hole, the operating surface is by first back-moving spring and holds Portion's connection, the grip component further includes buffer spring, and one end is fixedly installed in kidney slot terminal surface, and the other end is fixedly installed in Position protruding shaft.

Further, the outer ratchet includes outer Ratchet body and the spine outside the bending structure of the outer Ratchet body upper end Wheel arm, the outer Ratchet body center are ratchet cavity, and lower part is cylinder cavity, and the handle ratchet wheel includes handle ratchet wheel main body and position In the bending structure handle ratchet wheel arm of the handle ratchet wheel lower body, the spring ratchet includes spring portion, the spring portion upper end It is fixedly connected with ratchet, lower end is fixedly connected with column contact portion, and the spring ratchet is installed in the handle ratchet wheel main body Portion's cavity, and the ratchet is stretched out from the first ratchet hole of the handle ratchet wheel body surfaces, the handle ratchet wheel main body and spring Ratchet is installed on ratchet cavity inside, and the handle ratchet wheel arm is stretched out from cylinder cavity.

Further, the outer Ratchet body is consistent with handle ratchet wheel body thickness, and its left and right ends respectively with front support The inner face of plate and rear bearing sheet is close to, and there are perforative first movable slotted hole, end in position among the outer arm of ratchet surface There is the first guide plate in left and right end face, and there are perforative second movable slotted hole, end or so in position among handle ratchet wheel arm surface There is the second guide plate in end face, when outer ratchet, handle ratchet wheel are engaged with spring ratchet nesting, first guide plate and the second guiding The lucky split of plate inner face, and form one or so guide board structures, and fixture block is in first guide plate, the second guide plate, interior The ladder cavity installation that arm of ratchet end and outer arm of ratchet are formed, and its end face is close to installation with the end face of block.

Further, the traction guard assembly further includes adjusting knob and cam, and the adjusting knob is installed on handle ratchet wheel At main body outer end face center, and pass through adjusting knob mounting hole, and be installed in the cam of handle ratchet wheel body interior cavity Mandrel is fixedly connected, the cam face with column contact portion is tangent contacts.

Further, the link mechanism includes jacking block, L shape connecting rod and shear arm, and the jacking block is lid shape structure, bottom For blind hole, top is the sheet link mounting feature that there is third mounting hole in centre, and the L shape connecting rod two end has connecting rod mounting hole, There is shear arm mounting hole in the shear arm rear end and its turning point is the first hinge hole, the shear arm mounting hole and preceding end link Mounting hole is rotatablely connected by the second pin shaft, and two sets of L shape connecting rods and shear arm pass through third pin shaft at rear end link mounting hole It is rotatablely connected with third mounting hole, and described two first hinge holes, therebetween lantern ring and hinge hole pass through the 4th pin shaft Rotation connection separately has third reset spring connection jacking block upper surface and outer ratchet outer wall.

Further, the line shaft is movably installed in inside cylindrical cavity, and its front end passes through baffle through-hole, is installed on blind In hole, the line shaft rear end face and positioning face contact, and end face is connected by second back-moving spring and cylindrical cavity end thereafter It connects.

Further, the clamp assemblies include metal splint, and metal splint appearance curve is approximate with fetus head, and fixed It is installed on shear arm end, another flexible intermediate plate is fixedly installed in the metal splint middle inside and uses flexible buffer material Material.

Compared with prior art, the beneficial effects of the present invention are:

1) remote control clamping activity can be effectively performed by simple link mechanism in clamping transmission component；

2) by handle ratchet wheel, outer ratchet, the traction guard assembly of spring ratchet composition realizes grip component when tractive force is excessive With the unhook of clamp assemblies, protection is effectively performed；

3) cam, the control structure of adjusting knob and spring ratchet composition, can carry out effectively the pretightning force of spring ratchet Ground is adjusted, and then the size of tractive force protection can be controlled simply；

4) when the excessive grip component of tractive force and clamp assemblies break off relations, clamp assemblies can automatically return to initial opening angle, Fetus is caused to injure the out of control of claming angle after avoiding unhook；

5) flexible clip of clamp assemblies can carry out further buffer protection for fetus head.

Detailed description of the invention

It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art Embodiment or attached drawing needed to be used in the description of the prior art do simple introduction, it should be apparent that, it is described below Attached drawing is some embodiments of invention, for those of ordinary skill in the art, without creative efforts, It is also possible to obtain other drawings based on these drawings.

Fig. 1 is figure of the embodiment of the present invention；

Fig. 2 is shell support component structure chart；

Fig. 3 is grip component and holds transmission component cross-sectional view；

Fig. 4 is traction guard assembly structure chart；

Fig. 5 is traction guard assembly cross-sectional view；

In figure: 1, shell support component；11, front end panel；111, adjusting knob mounting hole；12, rear bearing sheet；13, kidney slot； 14, hinge hole；15, baffle；151, baffle through-hole；2, grip component；21, holding rod；211, cylindrical cavity；212, convex Axis；213, otic placode is installed；2131, the first mounting hole；214, trigger cavity；215, grip part；216, promotion part；2161, fixture block； 22, trigger quarter butt；221, the second mounting hole；222, operating surface；223, positioning surface；23, first back-moving spring；24, the first pin shaft； 25, buffer spring；3, transmission component is clamped；31, line shaft；32, jacking block；321, sheet link mounting feature；322, third is installed Hole；323, blind hole；33, second back-moving spring；34, third reset spring；35, L shape connecting rod；351, connecting rod mounting hole；36, scissors Arm；361, shear arm mounting hole；362, the first hinge hole；37, the second pin shaft；38, third pin shaft；39, the 4th pin shaft；4, it clamps Component；41, metal splint；42, flexible clip；5, guard assembly is drawn；51, outer ratchet；511, outer Ratchet body；5111, column Face cavity；5112, ratchet cavity；512, outer arm of ratchet；5121, the first movable slotted hole；513, the first guide plate；514, it second leads To plate；52, handle ratchet wheel；521, handle ratchet wheel main body；5211, the first ratchet hole；522, handle ratchet wheel arm；5221, the second movable slotted hole； 53, adjusting knob；54, cam；55, spring ratchet；551, ratchet；552, spring portion；553, contact portion；6, lantern ring.

Specific embodiment

Clear, complete description is carried out below with reference to technical solution of the attached drawing to various embodiments of the present invention, it is clear that is retouched The embodiment stated is only a part of the embodiments of the present invention, instead of all the embodiments.Based on the embodiment of the present invention, originally Field those of ordinary skill obtained all other embodiment without making creative work, belongs to this hair Bright protected range.

In the description of the present invention, it should be noted that the attached drawing operation principles and reality of the invention only for the purposes of description Existing mode, rather than the device or element of indication or suggestion meaning must have certain size numerical value, face shaping or with spies Fixed dimension scale cooperation, therefore be not considered as limiting the invention.In addition, term " first ", " second ", " third " are only For descriptive purposes, it is not understood to indicate or imply relative importance.

The present invention is described in further detail below by specific embodiment and in conjunction with attached drawing.

As shown in Figure 1, the embodiment of the invention provides a kind of Self-unlocking gynemetrics obstetric forceps, including shell support component 1, it uses In the grip component 2 that far-end operation is clamped and drawn, the clamping transmission component 3 of clamping conduction is connect and realized with grip component 2, The clamp assemblies 4 coincideing positioned at end and curve and fetus head, and the traction of traction protection is connect and realized with grip component 2 Guard assembly 5.

The following are specific embodiments:

As shown in Fig. 2, shell support component 1 is made of front end panel 11, rear bearing sheet 12 and baffle 15, above-mentioned support plate shape Profile is consistent, and there is a kidney slot 13 in end, and there is hinge hole 14 on top, and there is a threaded hole at middle part, and front end panel 11 is close to hinge Connecing at hole 14 has an adjusting knob mounting hole 111；15 width of baffle is consistent in support plate, and has a circular baffle plate through-hole at center 151。

When actual installation, the left and right end face of baffle 15 is bonded with the inner face of front end panel 11 and rear bearing sheet 12 respectively, And be fixedly connected at the threaded hole of two support plates middle part, so that front end panel 11 and rear bearing sheet 12 are formed relative to baffle 15 It is symmetrically installed.

As shown in figures 1 and 3, grip component 2 is class gun-shaped structure comprising holding rod 21, trigger quarter butt 22, first is multiple Position spring 23, the first pin shaft 24 and buffer spring 25；Holding rod 21 is a gun-shaped square bar, and bottom end is grip part 215, and top is Promotion part 216 is cylindrical cavity 211 inside promotion part 216, and its left and right ends has a diameter and 13 width one of kidney slot The positioning protruding shaft 212 of cause；The junction left and right ends of promotion part 216 and grip part 215 stretches out installation otic placode 213 respectively, and There is one first mounting hole 2131 in installation 213 lower end of otic placode；In addition there is also a trigger cavitys 214 convenient for pulling for 216 rear end of promotion part The activity of machine quarter butt 22, front end are the slightly larger rectangular fixture block 2161 of a size, and are existed between fixture block 2161 and promotion part 216 pair The ramp structure of title is excessive；22 top of trigger quarter butt is positioning surface 223, and lower end is operating surface 222, and intermediate portion is divided into second Mounting hole 221.

When actual installation, trigger quarter butt 22 is placed in inside trigger cavity 214, and via the first pin shaft 24 by the first mounting hole 2131 and second the rotation of mounting hole 221 connect, trigger quarter butt 22 is separately connect with grip part 215 by first back-moving spring 23, and First back-moving spring 23 is former long when original state, and the positioning protruding shaft 212 of 21 or so end face of holding rod is respectively placed in front end panel 11 with the kidney slot 13 on rear bearing sheet 12, and buffer spring 25 is installed in kidney slot 13；So that grip component 2 can be in waist It is moved in parallel in shape hole 13, trigger quarter butt 22 can be in freely revolving in progress certain angle in the trigger cavity 214 of holding rod 21 Turn, and when not applying external force, trigger quarter butt 22 returns initial position because of first back-moving spring 23.

Shown in as shown in Figure 1, Figure 3 and Figure 4, clamping transmission component 3 includes line shaft 31, jacking block 32, second back-moving spring 33, and the Three reset springs 34, L shape connecting rod 35, shear arm 36, the second pin shaft 37, third pin shaft 38 and the 4th pin shaft 39；Line shaft 31 is straight Diameter and baffle through-hole 151 and cylindrical cavity 211 are consistent, are movably installed in 211 inside of cylindrical cavity and pass through baffle through-hole 151, And rear end face is close to the positioning surface 223 of trigger quarter butt 22 when its original state；Jacking block 32 is a dome-shaped structure, interior blind hole 323 apertures are consistent with 31 diameter of line shaft, and 31 front end face of line shaft is close to 32 inner face of jacking block when original state, another jacking block 32 Top is sheet link mounting feature 321, is third mounting hole 322 among the link mounting feature 321；35 front and back two of L shape connecting rod There is connecting rod mounting hole 351 at end, and there is shear arm mounting hole 361 in 36 rear end of shear arm and its turning point is the first hinge hole 362, L Connecting rod mounting hole 351 and shear arm mounting hole 361 of the shape connecting rod 35 with shear arm 36 by the second pin shaft 37 through being located at end rotate Installation, and L shape connecting rod 35 is close to link mounting feature 321, and third mounting hole 322 and preceding end link mounting hole 351 are passed through Third pin shaft 38 is rotatablely connected；Separately there is a set of L shape connecting rod 35 with shear arm 36 and aforementioned link mechanism relative to 32 center of jacking block Symmetrically, and by the first hinge hole 362 of two shear arms 36 and the hinge hole 14 of shell support component 1 pass through 39 turns of the 4th pin shaft Dynamic connection；Second back-moving spring 33 is fixedly connected with 31 rear end face of line shaft, and when original state, and second back-moving spring 33 is in Former long status, rear end are contacted with cylindrical cavity 211；Third reset spring 34 is fixedly connected with 32 front end face of jacking block, and initial shape When state, 34 front end of third reset spring contacts with outer 51 outer wall of ratchet and is in small compression state.

When actual installation, separately there is lantern ring 6, inside have diameter and the consistent through-hole of the 4th pin shaft 39, lantern ring 6 is installed on Four pin shafts 39 are located at the interlude between two shear arms 36, and left and right end face is close to two 36 inner faces of shear arm respectively, Lantern ring 6 plays support positioning action, so that the outer end face of two shear arms 36 is respectively and in front end panel 11 and rear bearing sheet 12 It is close to end face；Line shaft 31 pushes jacking block 32 to travel forward, then drives by L shape connecting rod when 211 forward slip of cylindrical cavity 35 and shear arm 36 form connecting rod mechanism movement, be finally completed the closed action of 36 end of shear arm；When not providing external force branch When support, second back-moving spring 33 sets back line shaft 31 with jacking block with third reset spring 34, so that shear arm 36 End reopens recovery to original state.

As shown in Figure 4 and Figure 5, traction guard assembly 5 includes outer ratchet 51, handle ratchet wheel 52, adjusting knob 53,54 He of cam Spring ratchet 55；Handle ratchet wheel 52 includes handle ratchet wheel main body 521 and handle ratchet wheel arm 522, wherein has cavity inside handle ratchet wheel main body 522 For installing cam 54, and adjusting knob 53 is installed on 521 outer end face of handle ratchet wheel main body, and through 521 end face of handle ratchet wheel main body It is fixedly connected at round hole and 54 center of cam；Spring ratchet 55 is installed on 521 internal cavities of handle ratchet wheel main body, including ratchet 551, spring portion 552 and contact portion 553, ratchet 554 are fixedly connected with 552 top of spring portion, and from the of handle ratchet wheel main body 521 One ratchet hole 5211 is pierced by, and 552 lower end of spring portion is fixedly connected with cylinders contact portion 553, and contact portion 553 and 54 surface of cam Contact；Handle ratchet wheel arm 522 is a bending plate structure, and there is the second movable slotted hole 5221 on surface, is stretched out for L shape connecting rod 35 and living It is dynamic；Outer ratchet 51 includes outer Ratchet body 511 and outer arm of ratchet 512, and outer Ratchet body 511 includes cylinder cavity 5111 and ratchet Cavity 5112, wherein handle ratchet wheel main body 521 and ratchet 551 are mountable to just in ratchet cavity 5112 and handle ratchet wheel arm 522 can It stretches out from cylinder cavity 5111 and is move freely in certain angle；Outer arm of ratchet 512 is a bending plate structure, and surface has the One movable slotted hole 5121 is stretched out and movable for L shape connecting rod 35；In addition outer arm of ratchet 512 and 522 end of handle ratchet wheel arm or so two There are the first guide plate 513 and the second guide plate 514 in end face respectively, when outer ratchet 51 is engaged with handle ratchet wheel 52 through spring ratchet 55 When, outer arm of ratchet 512 forms ladder cavity with 522 end of handle ratchet wheel arm, and ladder cavity small end is consistent with 216 section of grip part, Ladder cavity big end is consistent with 2161 section of fixture block, and the first guide plate 513 and the complete split shape of 514 inner face of the second guide plate Guiding at lateral plate structure, on left and right directions.

As shown in the direction Fig. 5, when actual installation, by outer Ratchet body 511, handle ratchet wheel main body 521 and spring ratchet 55 are pacified Dress engagement, and rotation of adjustment knob 53 is rotated with moving cam 54, contact portion 553 moves up and down as cam 54 rotates, and changes bullet The shrinkage degree in spring portion 552 is to adjust 551 stress of ratchet, so that handle ratchet wheel 51 and outer ratchet 52 are by thrust clockwise When it is locked, when by counter-clockwise thrust, be enough to overcome 551 stress of ratchet when thrust increases to and be pressed into handle ratchet wheel main body When 521 internal cavities, relative counterclockwise rotation can occur for inside and outside ratchet, to drive outer arm of ratchet 512 and handle ratchet wheel arm 522 And its first guide plate 513 and the second guide plate 514 opening of end.

When being located at original state, fixture block 2161 is located inside the first guide plate 513 and the second guide plate 514, and it is left Right side is close to guide groove inner face respectively, and front end face is close to block 15, and promotion part 216 is then from the first guide groove 513 It is stretched out in the hole formed with the second guide groove 514.

As shown in Figure 1, clamp assemblies 4 include metal splint 41 and flexible clip 42, metal splint 41 be appearance curve with The similar blade construction of fetus head, and it is fixedly connected with 36 end of shear arm, flexible clip 42 is using flexible material to tire Protection buffer function is played on youngster head, and its appearance curve coincide with 41 middle section of metal splint just, and is fixedly installed in gold Belong to the inner face centre of clamping plate 41.

When specifically used, when the grip part 215 of gripping holding rod 21 travels forward, due to 2161 end of fixture block and baffle 15 The position be close to, and then reached needed for driving entire Obstetric forceps to move forward to；When Obstetric forceps move to appendages of fetus, adjust Clamp direction, hold the grip part 215 of holding rod 21 and the operating surface 222 of cocking quarter butt 22 backward, trigger quarter butt 22 around The rotation of first pin shaft 24 drives the rotation of its positioning surface 223, and then propulsion power axis 31 moves forward in the horizontal direction, line shaft 31 The link mechanism fortune for driving jacking block 32 to travel forward across baffle through-hole 151, and then L shape connecting rod 35 and shear arm 36 being pushed to form It is dynamic, it is finally completed the closed action of 36 end of shear arm, so that metal splint 41 and flexible clip 42 are tightened, and is slowly pressed from both sides Handle fetus head；After the completion of holding action, arm continuation is slowly had an effect, and traction grip part 215 moves out, due to fixture block 2161 are placed in inside the first guide plate 513 and the second guide plate 514, and the first guide plate 513 and the second guide plate 514 due to The effect of handle ratchet wheel 51 and outer ratchet 52, conventional sense lock motionless, and then have an effect and draw obstetric forceps and baby head moves out； When tractive force is beyond preset value set by adjusting knob 53, the external arm of ratchet 512 of fixture block 2161 and handle ratchet wheel arm 522 to Extrapolability overcomes the pre set force of spring portion 552, so that ratchet 551, which suffers oppression, is reduced to downwards the inside sky of handle ratchet wheel main body 521 Chamber, inside and outside ratchet relatively rotate, so that outer arm of ratchet 512 and handle ratchet wheel arm 522 open, 513 He of the first guide groove Second guide groove 514 is formed by hole area increase, and the grip component 2 drawn outward is made to be detached from traction 5 edge of guard assembly Kidney slot 13 move out, simultaneously because be located at 13 end of kidney slot buffer spring 25 effect, avoid in grip component 2 When being detached from traction guard assembly 5, motion amplitude is excessive, causes the injury of puerpera and fetus；At this point, due to trigger quarter butt 22 also to Outer movement, the line shaft 31 in clamp position lose support, by the effect of second back-moving spring 33, slide in and out, jacking block 32 Also because of the effect of third reset spring 34 as line shaft 31 moves out, until so far front end retained part is also opened at block 15 Recovery is opened to original position, avoid tractive force it is excessive when, after grip component 2 and rest part are detached from, front end retained part is still pair Fetus head clamping damages.

Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used To modify to technical solution documented by previous embodiment, or some or all of the technical features are equal Replacement；And these are modified or replaceed, technical solution of the embodiment of the present invention that it does not separate the essence of the corresponding technical solution.