CN212794766U - Medical torque-adjustable screwdriver and assembly system of limiting ring thereof - Google Patents

Abstract

The utility model discloses an assembly system of medical adjustable moment screwdriver and spacing collar thereof. The medical torque-adjustable screwdriver comprises a handle, a screwdriver rod, a limiting ring, a ratchet wheel, an elastic piece and an adjusting block; the handle is provided with an accommodating cavity, the front end of the accommodating cavity is provided with a cutter bar outlet, and the rear end of the accommodating cavity is provided with an assembling port; the cutter bar is provided with an annular bulge, and the rear end surface of the cutter bar is a ratchet surface; the front end of the cutter bar extends out of the accommodating cavity from the cutter bar outlet, and the annular bulge realizes axial limit on the cutter bar; the limiting ring is sleeved on the cutter bar, so that the front end face of the limiting ring is attached to the rear end face of the annular bulge; fixing a limiting ring on the inner wall of the accommodating cavity, and axially limiting the cutter rod; the ratchet surface is meshed with the ratchet; the elastic piece is positioned between the ratchet wheel and the adjusting block; the adjusting block is externally provided with an external thread, and the inner wall of the accommodating cavity is provided with an internal thread so that the adjusting block is in threaded connection with the inner wall of the accommodating cavity. An assembly tool for use therewith is also disclosed. The utility model discloses moment is adjusted simply, and control range is wide, uses safe and reliable.

Description

Medical torque-adjustable screwdriver and assembly system of limiting ring thereof

Technical Field

The utility model relates to the field of medical equipment, concretely relates to assembly system of medical moment adjustable screwdriver and spacing collar thereof.

Background

Currently, in neurosurgical clinical operation, the active implanted medical device is generally divided into two parts, namely a stimulator and an electrode, but the two parts are separated, so that a connection problem exists between the two parts. In the operation of the active implantation type medical instrument, if a non-torque screwdriver is used for locking components such as an electrode and a lead, the connecting component is often damaged or not locked tightly because the output torque cannot be controlled, the quality of the operation is affected if the connecting component is light, and the operation fails if the connecting component is heavy. In addition, the torque output of the torque screwdriver is unstable, so that the operation fails.

The torque screwdriver on the market, for example, publication number is: CN204839713U and publication No.: the torque screwdriver of CN202556324U has the following disadvantages:

a) in the use process, due to the structural limitation, the knife handle and the knife head can generate slight axial displacement, so that the torque output by the torque is unstable, and the operation failure can be caused;

b) the moment adjustment is complex, and the situation that the tool bit is separated from the tool shank can be possibly generated when the moment is adjusted in factory; or the situation of the cutter head rotating along with the cutter head can occur;

c) due to structural limitation, the adjustable moment is relatively small and is generally below 1.0 kgfcm;

for another example, publication nos.: the torque driver in CN207807574U can avoid the axial displacement, but is a constant torque driver, and once the torque that cannot adjust the torque changes, the design needs to be changed again, which increases the use cost.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a medical moment adjustable screwdriver can solve one or more among the above-mentioned technical problem.

In order to achieve the above object, the present invention provides the following technical solutions:

a medical screwdriver with adjustable torque comprises a handle, a screwdriver rod, a limiting ring, a ratchet wheel, an elastic part and an adjusting block; the handle is provided with an accommodating cavity, the front end of the accommodating cavity is provided with a cutter bar outlet, and the rear end of the accommodating cavity is provided with an assembling port. The assembly opening is buckled with a rear cover for preventing dust and foreign matters from falling.

The cutter bar is provided with an annular bulge, and the rear end surface of the cutter bar is a ratchet surface; the front end of the cutter bar extends out of the accommodating cavity from the cutter bar outlet, and the annular bulge realizes axial limit on the cutter bar; the limiting ring is sleeved on the cutter bar, so that the front end face of the limiting ring is attached to the rear end face of the annular bulge; fixing the limiting ring on the inner wall of the accommodating cavity, and axially limiting the cutter rod; the ratchet surface is meshed with the ratchet; the elastic piece is positioned between the ratchet wheel and the adjusting block; the adjusting block is externally provided with an external thread, and the inner wall of the accommodating cavity is provided with an internal thread so that the adjusting block is in threaded connection with the inner wall of the accommodating cavity.

The utility model discloses simple structure because the combined action of annular arch and spacing collar makes this moment screwdriver cutter arbor can not take place axial displacement for the handle in the use, and moment screwdriver output torque is stable, uses reliably.

In addition, the regulation of the torque is more convenient and simpler, and the regulation of the output torque can be realized only by regulating the screwing depth of the regulating block into the accommodating cavity according to the use requirement and changing the pressure of the elastic part on the ratchet wheel. Each adjustment can be carried out by means of a special torque measuring device.

Moreover, for the torque screwdriver, due to the combined action of the annular bulge and the limiting ring, the screwdriver rod cannot fall off no matter how the screwdriver rod is adjusted, and the structure is reliable and stable.

The utility model discloses in preferred one scheme be in order to increase the use intensity of cutter arbor, the cutter arbor diameter that is located the cutter arbor that holds the intracavity and exports annular bulge from the cutter arbor increases thickly. Because the cutter arbor in annular protruding rear stretches into the spacing collar, the diameter of the cutter arbor has been increased to the diversion, has certain guard action to the cutter arbor.

In the using process, the front end of the cutter bar is usually arranged to be an inner hexagonal wrench head, so that the matching performance is better;

because the rear end of the cutter rod is meshed with the ratchet wheel, when the cutter rod or the ratchet wheel is required to rotate and dislocate to make a rattling sound to remind a user when the cutter rod or the ratchet wheel meets a limit torque, at least one of the cutter rod and the ratchet wheel can rotate in the accommodating cavity of the cutter handle. In addition, on the rotatable basis, the ratchet wheel needs to have certain axial displacement to realize the separation from the cutter bar.

The mode of fixing the spacing collar in the holding cavity is not limited, and limitation is performed according to actual needs, for example, the axial fixation of the spacing collar is realized by gluing and connecting threads, or a stepped limiting shoulder is arranged in the holding cavity.

An optimized structure is provided, and the limiting ring is provided with a second external thread and is connected with the inner wall of the accommodating cavity through threads. The threaded connection is simple, and meanwhile, the disassembly and the maintenance are convenient.

In addition, in some embodiments, a gluing hole is formed in the accommodating cavity, the gluing hole penetrates through the accommodating cavity, and the gluing hole is communicated with the limiting ring. Fixing the stop collar on the inner wall of the accommodating cavity of the handle through glue is also an optional operation.

In addition, two modes of gluing holes and threaded connection can be combined to be used as a fixing mode of the limiting ring. The cutter rod can be effectively prevented from obtaining axial displacement due to thread abrasion.

Preferably: the ratchet wheel is provided with a guide post, the front end of the guide post is provided with a check ring, the elastic piece is a spring, and the spring is sleeved on the guide post. The guide posts here ensure the stability of the spring mounting.

Preferably: the adjusting block comprises a sleeve and a guide cavity; the external thread is arranged outside the sleeve, and the sleeve covers the guide column; and a guide cavity is axially arranged along the sleeve, and the guide cavity is matched with the guide post so that the guide post slides in the guide cavity.

When the adjusting block moves along the internal thread of the handle, in order to ensure the compression stability of the spring and avoid the uneven deformation of the spring, a sleeve is added, the lower surface of the sleeve is in contact with the spring, and the pressure on the spring is uniform all the time in the downward moving process; in order to reduce the clamping stagnation of the guide post, the guide post is moved in the guide cavity.

Preferably: the sleeve is provided with adjusting holes, and the adjusting holes are arranged around the guide cavity in an equally-distributed manner. The adjusting hole is mainly a tool which is convenient for externally connecting a tool and is used for connecting the rotating sleeve.

Preferably: still set up the injecting glue hole on the sleeve, the injecting glue hole sets up along holding the chamber axial, and wherein injecting glue hole axial lateral wall has the breach, it plugs this breach to hold the intracavity wall, makes the injecting glue hole forms glue accommodation space with holding the intracavity wall jointly.

The glue injection hole is additionally formed, the sleeve is further fixed on the handle through glue, the screw pitch and the thread teeth of the screw thread are also very thin due to the fact that the screwdriver is small in size, the screw thread is easy to wear in the repeated adjustment process, the service life is prolonged within the adjustable range, and the screwdriver is prevented from being out of work due to thread wear.

Preferably: the cross section of the guide post is polygonal, and the guide cavity is polygonal. Therefore, the ratchet wheel can be prevented from rotating, and the displacement of the ratchet wheel in the axial direction can be ensured not to deviate.

Preferably: a first gasket is arranged between the annular protrusion and the accommodating cavity, and a second gasket is arranged between the annular protrusion and the limiting ring. The first and second washers are preferably PTFE washers, which can reduce frictional resistance.

The use of the gasket can protect devices on two sides of the gasket, and avoid direct friction and mutual loss; in addition, the gasket can absorb part of vibration, and when the torque value is reached, the impact force of the ratchet wheel to the cutter bar can be reduced, so that the use stability is ensured.

Preferably: the first gasket is cup-shaped, and a small hole penetrating through the cutter bar is formed in the bottom of the cup. This packing ring is with the cutter arbor parcel between the cutter arbor exports annular arch from the cutter arbor, avoids the cutter arbor directly to hold the chamber friction with the handle of a knife, takes place wearing and tearing.

Preferably: the cutter bar is sleeved with an anti-clamping stagnation spring which is positioned between the annular bulge and the accommodating cavity.

The anti-clamping stagnation spring is mainly used for preventing clamping stagnation, and the specific working process is as follows: when the torque screwdriver is screwed by medical personnel to reach the peak torque, and the internal mechanism is not clamped, the spring on the upper side of the ratchet wheel is greatly deformed, the ratchet wheel axially displaces, and the torque screwdriver makes a clicking sound to normally work and prompts the medical personnel that the screw is locked;

but if the ratchet wheel can not realize axial displacement and generate clamping stagnation due to mechanical reasons, the action of the spring can be caused to lose efficacy, the cutter bar rotates along with the handle, then the moment of the stimulator screw is gradually increased and exceeds the design moment of the stimulator device but does not reach the damage moment, the clamping stagnation prevention spring begins to deform under pressure due to large moment, the annular protrusion downwards extrudes the clamping stagnation prevention spring due to large torsion, the ratchet surface on the rear end surface of the cutter bar is separated from the ratchet surface on the ratchet wheel, the cutter bar generates idling phenomenon and generates a sinking and stuffy sound to tell medical personnel that the device screw is screwed tightly.

At the moment, the moment borne by the screw of the stimulator device is between the designed moment and the maximum moment, and the device is not damaged. The anti-jamming spring prevents the stinger device screw hole from being damaged by too much torque.

The whole screwdriver is very small in size and about 5cm in length; inside spacing collar size will be littleer, and the installation is inconvenient, consequently the utility model discloses a another purpose is for the convenience of the installation of spacing collar, provides the mounting system of a spacing collar.

The assembling system of the limiting ring is characterized by comprising more than one assembling system of the limiting ring; the mounting rod comprises a first end face, a second end face and a mounting rod, wherein the first end face is arranged on the end face of the limiting ring, the second end face is arranged on one end face of the mounting rod, the other end face of the mounting rod is a force application end, and the first end face and the second end face are mutually crossed, so that the mounting rod clamps the limiting ring and the limiting ring rotates along with the rotation of the mounting rod.

Due to the small size, when the limit ring and the inner wall of the handle are connected by the screw thread, the assembly difficulty is high, so that the limit ring is convenient to install, and an auxiliary tool, namely an installation rod, is used for installing the limit ring; because the diameter of the limiting ring is about 8mm and is an external thread, the assembly that the handle needs to be screwed in is difficult, and therefore, the design of a structure which can apply torque and clamp to realize threaded connection is considered.

Firstly, because two abutting flat end faces are generally incapable of transmitting torque unless the friction force is very large; but the size of the limiting ring is small, so that the friction force of the end face cannot be increased through pressure; it is therefore contemplated to provide end faces with a "key" like structure for transmitting torque, such as a "ratchet face" or other similar concavo-convex corresponding end face structure; thus, the spiral installation of the limiting ring can be completed only by applying radial force to the installation rod;

in addition, the clamping is needed, the clamping is realized by considering the friction force because the operation space is smaller and the weight of the limiting ring is lighter, and the friction force in the vertical direction can overcome the gravity of the limiting ring, so that the limiting ring is kept at the front end of the mounting rod by the friction force, the limiting ring is ensured not to be separated from the mounting rod, and the mounting rod can drive the limiting ring to move to realize the clamping effect;

in conclusion, a more suitable structure is that the first end face and the second end face are mutually crossed, so that torque transmission can be realized, and meanwhile, the limiting ring can have a friction force along the mounting rod to overcome the gravity of the limiting ring and can be clamped by the mounting rod.

In addition, the hole can be formed in the end face of the limiting ring, the mounting rod is provided with the protrusion extending into the hole, the protrusion and the hole are in interference fit to ensure clamping, the protrusion entering the hole can also play a role in torque transmission, and the protrusion at the front end of the mounting rod is preferably a protrusion (such as plastic or rubber) with certain elastic deformation, so that interference fit can be realized through small deformation of the protrusion, and friction is increased to prevent the limiting ring from falling out.

In some embodiments, the first end surface is a blind hole, the second end surface is a protrusion extending into the blind hole, the blind hole is formed in the end surface of the stop collar, and the protrusion extends outwards along the end surface of the mounting rod.

The protrusion into the blind hole allows for an axially maximum surface friction and is therefore preferred, as is the torque.

Preferably: the force application end is a regular hexagonal prism, and the length of the hexagonal prism is longer than that of the handle. During assembly, the hexagonal prism can be matched with a commercially available hexagonal screwdriver to complete the installation of the limiting ring.

In addition, the force application end can be arranged in a pie shape or other shapes convenient for operation.

The technical effects of the utility model are that:

the utility model has simple and reasonable structure, ensures the cutter bar not to move axially in the using process, and realizes the torque adjustment; and the adjustment process is very simple.

An assembly system is added in matching with the assembly system, so that the functions are realized, the assembly difficulty is reduced, and the assembly efficiency of the product is improved.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.

In the drawings:

fig. 1 is a schematic diagram of the overall structure of the present invention;

FIG. 2 is a schematic view of the handle construction;

FIG. 3 is a schematic view of the tool bar;

FIG. 4 is a schematic view of a ratchet structure;

FIG. 5 is a schematic view of the adjustment block of FIG. 1 (external threads not shown);

FIG. 6 is a schematic structural view of a spacing collar;

FIG. 7 is a schematic structural view of a mounting bar used in conjunction with FIG. 6;

FIG. 8 is a schematic view of the structure of FIG. 6 and FIG. 7 in cooperation;

FIG. 9 illustrates a first assembly;

FIG. 10 is a second assembly view;

fig. 11 is a third assembly view.

FIG. 12 is a schematic structural view of a tool for adjusting torque in cooperation with an adjusting block;

FIG. 13 is a schematic view of FIG. 12 during use;

FIG. 14 is a schematic view of the torque screwdriver of the present invention cooperating with a professional device to adjust torque;

fig. 15 is a preferred configuration of fig. 1.

Detailed Description

The invention will be described in detail with reference to the drawings and specific embodiments, wherein the exemplary embodiments and the description are only intended to explain the invention, but not to limit the invention in a proper manner.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

As shown in fig. 1, a medical torque-adjustable screwdriver comprises a handle 1, a screwdriver rod 2, a limiting ring 3, a ratchet 4, an elastic part 5 and an adjusting block 6.

As shown in fig. 2, the handle 1 has a receiving chamber 103 having a tool shank outlet 101 at a front end and a mounting opening 102 at a rear end.

As shown in fig. 3, the knife bar 2 has an annular protrusion 202, and the rear end surface of the knife bar is a ratchet surface 201; the front end of the cutter bar extends out of the cutter bar outlet to form an accommodating cavity 103, and the annular bulge 2 realizes axial limiting on the cutter bar.

The limiting ring 3 is sleeved on the cutter bar 2, so that the front end face of the limiting ring 3 is attached to the rear end face of the annular bulge 202; will spacing collar 3 is fixed on holding the chamber 103 inner wall, realizes axial spacing to cutter arbor 2.

The ratchet surface 201 is meshed with the ratchet 4; the elastic piece 5 is positioned between the ratchet wheel 4 and the adjusting block 6; the adjusting block 6 is externally provided with an external thread, and the inner wall of the accommodating cavity 103 is provided with an internal thread, so that the adjusting block 6 is in threaded connection with the inner wall of the accommodating cavity 103.

In certain embodiments: the limiting ring 3 is provided with a second external thread and is in threaded connection with the inner wall of the accommodating cavity 103.

In certain embodiments: the accommodating cavity 103 is provided with a glue applying hole 104, the glue applying hole 104 penetrates through the accommodating cavity, and the glue applying hole 104 is communicated with the limiting ring 3.

As shown in fig. 4, in some embodiments: set up guide post 402 on the ratchet 4, guide post 402 front end sets up retaining ring 401 (in order to avoid the ratchet to follow the rotation when rotatory, set up a plane 4011 in the retaining ring week), elastic component 5 is the spring, the spring housing is on guide post 402.

As shown in fig. 5, in some embodiments: the adjusting block 6 comprises a sleeve 601 and a guide cavity 602; the external thread is arranged outside the sleeve 601, and the sleeve 601 covers the guide post 402; a guide cavity 602 is axially disposed along the sleeve 601, the guide cavity 602 mating with the guide post 402 such that the guide post 402 slides within the guide cavity 602.

As shown in fig. 5, in some embodiments: the sleeve 601 is provided with adjusting holes 603, and the adjusting holes are equally distributed around the guide cavity 602.

As shown in fig. 5, in some embodiments: the sleeve 601 is further provided with a glue injection hole 604, the glue injection hole 604 is arranged along the axial direction of the accommodating cavity, a gap 6041 is formed in the axial side wall of the glue injection hole, the inner wall of the accommodating cavity blocks the gap, and therefore the glue injection hole and the inner wall of the accommodating cavity form a glue accommodating space together.

As shown in fig. 1, in certain embodiments: a first gasket 7 is arranged between the annular protrusion and the accommodating cavity, and a second gasket 8 is arranged between the annular protrusion and the limiting ring.

In certain embodiments: the first gasket is cup-shaped, and a small hole penetrating through the cutter bar is formed in the bottom of the cup.

As shown in fig. 6-8, the whole screwdriver has a very small size, and the length is about 5 cm; the size of the inner spacing ring is smaller, and the installation is inconvenient, so that the assembly system of the spacing ring is provided for the convenience of installing the spacing ring 3.

An assembling system of the limiting ring is provided; the mounting rod comprises a first end face, a second end face and a mounting rod 11, wherein the first end face is a blind hole 9, the second end face is a protrusion 10 extending into the blind hole, the blind hole is formed in the end face of the limiting ring, the protrusion 10 extends outwards along the end face of the mounting rod 11, the other end face of the mounting rod is a force application end 1101, the first end face and the second end face are mutually crossed, the mounting rod clamps the limiting ring, and the limiting ring rotates along with the rotation of the mounting rod.

In certain embodiments: the force application end 1101 is a regular hexagonal prism, and the length of the hexagonal prism is longer than that of the handle.

The assembly sequence is as follows:

as shown in fig. 9, a first gasket 7, a cutter bar 2 (the front end of the cutter bar is a hexagonal cutter head), and a second gasket 8 are sequentially installed in the handle 1;

installing a limiting ring 3, as shown in figures 10-12 and 14, wherein the limiting ring 3 is connected with the inner wall of the knife handle by external threads; the connection of the spacing ring 3 is through the installation pole 11, one end of the installation pole 11 sets up the bump 10 and pegs graft each other with the blind hole 9 of the end of spacing ring 3, another end of the installation pole 11 is hexagonal one end can cooperate with many screwdrivers shanks on the market to use, it is here best to adopt the cooperation of adjustable moment screwdrivers shanks to install (adjust the moment screwdriver gear on the market to "0 kgfcm", twist the moment screwdriver on the market, lock the spacing ring on the hand grip (certainly can also be the gear on 0.1kgfcm, 0.2kgfcm, etc., different gears can only cause the moment that different friction of idle running of the cutter arbor cause, will not have great influence to the product assembly of the utility model), and set up and glue the hole 104 further fixes, can prevent the spacing ring from becoming flexible;

as shown in fig. 10, the ratchet 4, the spring 5 and the adjusting block 6 are sequentially arranged in the handle; then, using a tool 12 matched with an adjusting block to perform torque adjustment, wherein the adjusting block tool is shown in figure 12; wherein, the adjusting block 6 has 4 adjusting holes (usually, the adjusting holes are arranged at equal intervals, and 2 or 3 holes are also possible).

As shown in fig. 13, the adjustment holes on the adjustment block are inserted with 4 cylinders 1201 on the mating block; as the adjusting block 6 is gradually screwed into the handle 1, the spring 5 is gradually extruded, the positive pressure on the ratchet wheel 4 is gradually increased, and finally the jacking force of the ratchet wheel 4 is increased when the ratchet wheel 4 is rotated by the cutter bar 2, so that the aim of large torsion of the torque screwdriver is fulfilled; therefore, the deeper the adjusting block 4 is inserted into the handle, the larger the torque of the torque screwdriver is.

After the adjusting block 4 is screwed into the handle for a certain length, the torque value of the torque screwdriver can be measured. As shown in fig. 14, the torque testing tool is first placed in the torque tester 13 (in the force measuring hole), then the hexagonal head at the front end of the cutter bar is inserted into the hexagonal groove of the torque testing tool, and after the torque testing tool is turned on, the torque screwdriver is rotated, and the measured data is the current torque value. If the measured data is higher, the adjusting block can be rotated anticlockwise through the adjusting block torque adjusting tool, and the torsion value is reduced; otherwise, the adjusting block is rotated clockwise, and the torsion value is increased. And then the hexagonal head of the adjusted torque screwdriver is plugged into a hexagonal groove of the torque testing tool to measure the torque, and the adjustment and the test are repeated so as to finally achieve the effect of adjusting the torque of the torque screwdriver.

When the torque screwdriver is screwed by medical personnel to reach the peak torque, and the internal mechanism is not blocked, the spring on the upper side of the ratchet wheel is greatly deformed, the ratchet wheel is moved up and down in a string manner, and the torque screwdriver makes a clicking sound to work normally and prompts the medical personnel that the screw is locked; however, if the ratchet wheel is mechanically jammed by moving up and down, the action of the spring is lost, the cutter bar rotates along with the handle, no clicking sound is heard no matter how much force is applied, and the screw hole of the stimulator device can be damaged due to too large moment.

The torque screwdriver can be further upgraded aiming at the hidden trouble.

Another upgraded version of the torque screwdriver is as follows: as shown in fig. 15, in some embodiments: an anti-clamping spring 14 is sleeved on the cutter bar 2, and the anti-clamping spring 14 is positioned between the annular bulge 202 and the accommodating cavity 103.

The anti-clamping stagnation spring has the advantage of large elasticity. When the torque screwdriver is screwed by medical personnel to reach the peak torque, and the internal mechanism is not clamped, the spring on the upper side of the ratchet wheel is greatly deformed, the ratchet wheel is moved up and down in a string manner, and the torque screwdriver makes a clicking sound to work normally and prompts the medical personnel that the screw is locked; however, if the ratchet 4 is moved up and down due to mechanical reasons to generate clamping stagnation, the action of the spring 5 is disabled, the cutter bar 2 rotates along with the handle 1, then the torque of the stimulator screw is gradually increased and exceeds the design torque of the stimulator device but does not reach the damage torque, the clamping stagnation prevention spring begins to deform under pressure due to large torque, the annular protrusion downwards extrudes the clamping stagnation prevention spring due to large torque, the ratchet surface 201 on the rear end surface of the cutter bar 2 is separated from the ratchet surface on the ratchet 4, the cutter bar 2 idles and generates clunking sound, and medical staff is informed that the device screw is screwed down. At the moment, the moment borne by the screw of the stimulator device is between the designed moment and the maximum moment, and the device is not damaged. The anti-jamming spring prevents the stinger device screw hole from being damaged by too much torque.

The utility model discloses a moment screwdriver has following advantage:

1. in the using process, the knife handle and the knife head can not generate slight axial displacement, because the annular bulges on the knife rod are axially limited at the front and the back, and the axial displacement of the annular bulges is prevented;

2. the situation that the tool bit is separated from the tool holder cannot be generated when the torque is adjusted when the tool leaves a factory, and the torque adjustment is simple; the principle is the same as the above, and the axial limiting of the cutter bar is mainly realized;

3. the situation that the tool bit rotates along with the tool bit cannot occur when the torque is adjusted when the tool leaves a factory, and the torque adjustment is simple;

4. the structure design can keep the condition of the needed torque of different stimulator products, the adjustable torque is larger, and the adjustable range is 0-2kgfcm

5. The optimized torque screwdriver can prevent the equipment from being damaged when the torque screwdriver is clamped.

To sum up, the utility model discloses a screwdriver, simple structure, whole convenient to use.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The medical torque-adjustable screwdriver is characterized in that: comprises a handle, a cutter bar, a limiting ring, a ratchet wheel, an elastic piece and an adjusting block;

the handle is provided with an accommodating cavity, the front end of the accommodating cavity is provided with a cutter bar outlet, and the rear end of the accommodating cavity is provided with an assembling port;

the cutter bar is provided with an annular bulge, and the rear end surface of the cutter bar is a ratchet surface;

the front end of the cutter bar extends out of the accommodating cavity from the cutter bar outlet, and the annular bulge realizes axial limit on the cutter bar;

the limiting ring is sleeved on the cutter bar, so that the front end face of the limiting ring is attached to the rear end face of the annular bulge; fixing the limiting ring on the inner wall of the accommodating cavity, and axially limiting the cutter rod;

the ratchet surface is meshed with the ratchet; the elastic piece is positioned between the ratchet wheel and the adjusting block;

the adjusting block is externally provided with an external thread, and the inner wall of the accommodating cavity is provided with an internal thread so that the adjusting block is in threaded connection with the inner wall of the accommodating cavity.

2. The medical torque-adjustable screwdriver as recited in claim 1, further comprising: the limiting ring is provided with a second external thread and is in threaded connection with the inner wall of the accommodating cavity.

3. The medical torque-adjustable screwdriver as recited in claim 1, further comprising: the accommodating cavity is provided with a glue applying hole, the glue applying hole penetrates through the accommodating cavity, and the glue applying hole is communicated with the limiting ring.

4. The medical torque-adjustable screwdriver as recited in claim 1, further comprising: the ratchet wheel is provided with a guide post, the front end of the guide post is provided with a check ring, the elastic piece is a spring, and the spring is sleeved on the guide post.

5. The medical adjustable torque screwdriver as recited in claim 4, further comprising: the adjusting block comprises a sleeve and a guide cavity; the external thread is arranged outside the sleeve, and the sleeve covers the guide column; a guide cavity is axially arranged along the sleeve, and the guide cavity is matched with the guide post so that the guide post slides in the guide cavity; the sleeve is provided with adjusting holes which are arranged around the guide cavity in an equal distribution manner; still set up the injecting glue hole on the sleeve, the injecting glue hole sets up along holding the chamber axial, and wherein injecting glue hole axial lateral wall has the breach, it plugs this breach to hold the intracavity wall, makes the injecting glue hole forms glue accommodation space with holding the intracavity wall jointly.

6. The medical torque-adjustable screwdriver as recited in claim 1, further comprising: a first gasket is arranged between the annular protrusion and the accommodating cavity, and a second gasket is arranged between the annular protrusion and the limiting ring.

7. The medical adjustable torque screwdriver as recited in any one of claims 1-6, further comprising: the cutter bar is sleeved with an anti-clamping stagnation spring which is positioned between the annular bulge and the accommodating cavity.

8. The assembly system of the limit ring of the medical adjustable torque screwdriver according to claim 2; the method is characterized in that: the mounting rod comprises a first end face, a second end face and a mounting rod, wherein the first end face is arranged on the end face of the limiting ring, the second end face is arranged on one end face of the mounting rod, the other end face of the mounting rod is a force application end, and the first end face and the second end face are mutually crossed, so that the mounting rod clamps the limiting ring and the limiting ring can rotate along with the rotation of the mounting rod.

9. The spacing collar assembly system of claim 8; the method is characterized in that: the first end face is a blind hole, the second end face is a protrusion extending into the blind hole, the blind hole is formed in the end face of the limiting ring, and the protrusion extends outwards along the end face of the mounting rod.

10. The spacing collar assembly system of claim 8; the method is characterized in that: the force application end is a regular hexagonal prism, and the length of the hexagonal prism is longer than that of the handle.

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