CN204839713U - Medical miniature definite torque screwdriver - Google Patents

Abstract

The utility model discloses a medical miniature constant-torque screwdriver belonging to the scope of medical equipment, which is composed of a handle, a rotary rod, an outer ratchet, a rear cover, an inner ratchet, an outer washer, an inner washer, a spring and an adjustment component; it includes two structures; The inner ratchet and the outer ratchet are driven by the rotation of the handle, and the torque is output to the rotary rod, and then the torque is applied to the fastening part. By adjusting the internal adjustment parts, the load applied to the ratchet pair can be adjusted, thereby setting the torque value of the screwdriver. The utility model provides a miniature tool for the operation of the active implantable medical device, which makes the connection of the various parts of the medical device safer and more reliable; Optimized design to ensure the accuracy of the screwdriver.

Description

A medical miniature fixed torque screwdriver

technical field

The utility model belongs to the scope of medical instruments, in particular to a medical miniature constant torque screwdriver.

Background technique

For active implanted medical devices, it generally includes a battery circuit part, a wire part and an electrode part, and these parts are separated to facilitate surgical operations, but at the same time it also brings a connection problem. In the operation of active implantable medical devices, if a non-torque screwdriver is used to lock parts such as electrodes and wires, the connection parts will be damaged or not locked tightly due to the inability to control the output torque, which will affect the operation at least. The quality will lead to the failure of the operation. In addition, if the output torque of the torque screwdriver is unstable, or if the material and size of the cutter head are unreasonable, it will also lead to the failure of the operation. Aiming at these limitations, a medical miniature constant torque screwdriver was designed.

Utility model content

The purpose of this utility model is to propose a medical miniature constant torque screwdriver in view of many limitations of the prior art. , outer washer, inner washer, spring and adjustment parts; it includes two structures; one of the structures is at the front end of the handle, the rotary rod passes through the outer ratchet, inner ratchet, spring and then is threaded with the adjustment parts, and the back cover is connected to the handle Threaded connection; where two outer washers are placed on the steps of the outer ratchet, the end face of the outer ratchet engages with the end face of the inner ratchet, one inner washer is placed on the bottom of the inner circular groove of the inner ratchet and the adjustment part, and the spring is placed on the bottom of the inner ratchet. Between the two inner washers, the outer ratchet and the inner ratchet are pushed tightly by the elastic force applied by the spring.

The square structure at the middle part of the rotating rod matches the square structure at the inner hole of the outer ratchet.

The front end of the rotary rod is an inner hexagonal screwdriver, and the rear part is a section of thread.

The outer periphery of the inner ratchet and the inner wall of the handle are matched with double key grooves.

The inner washer placed on the bottom of the inner circular groove of the adjusting part may be replaced by a ball bearing.

The other structure is that the parts assembly sequence is the same as that of the previous one; wherein the rotating rod is divided into two sections, one section is a screwdriver head, and the other section is a bolt as a connecting rod. It is triangular or square, and fastened with the triangular or square groove of the front part of the outer ratchet; the rear part of the outer ratchet has a threaded hole, which is connected with the thread of the bolt connecting rod, and the bolt connecting rod connects the outer ratchet, inner ratchet, spring It is integrated with the bowl-shaped collar; the back cover is threadedly connected with the handle; two outer washers are placed on the steps of the outer ratchet, the end face of the outer ratchet meshes with the end face of the inner ratchet, and the inner ratchet and the bowl-shaped collar An inner washer is respectively placed on the bottom of the inner circular groove, and a spring is placed between the two inner washers, so that the outer ratchet and the inner ratchet are tightened by the elastic force applied by the spring.

The intentional effect of the utility model is to provide a miniature tool for the operation of the active implantable medical device, so that the connection of each part of the medical device is safer and more reliable; the utility model adopts some design means for reducing friction and spine The optimized design of the tooth lead angle ensures the accuracy of the screwdriver.

Description of drawings

Below in conjunction with accompanying drawing and specific embodiment, the utility model is described in further detail.

Figure 1 is an appearance diagram of a medical constant torque screwdriver.

Fig. 2 is a schematic diagram of an assembly structure of a medical constant torque screwdriver.

Fig. 3 is a sectional view of A-A of Fig. 2 .

Figure 4 is a schematic diagram of the tooth profile of the external ratchet.

Fig. 5 is a schematic diagram of the tooth profile of the inner ratchet.

Fig. 6 is a schematic diagram of the inner circular groove of the inner ratchet.

Fig. 7 is a schematic diagram of the ratchet teeth of the inner ratchet.

Fig. 8 is a schematic diagram of the structure of the handle.

Fig. 9 is a schematic diagram of the adjustment components.

Fig. 10 is a cross-sectional view of a medical constant torque screwdriver with a ball bearing as the adjusting part.

Fig. 11 is a schematic diagram of another assembly structure of a medical constant torque screwdriver.

Detailed ways

The utility model proposes a medical miniature constant torque screwdriver. The medical miniature constant torque screwdriver is mainly composed of a handle, a rotating rod, an outer ratchet, a rear cover, an inner ratchet, an outer gasket, an inner gasket, a spring and an adjustment component; The change of structure actually has the medical miniature fixed torque screwdriver of three kinds of structures (as shown in Fig. 2, Fig. 10, Fig. 11). The following will be described in detail in conjunction with the accompanying drawings.

As shown in Figures 1 to 9, Figure 2 shows a medical miniature constant torque screwdriver, including: handle 1, rotating rod 2, outer ratchet 3, rear cover 4, inner ratchet 5, outer washer 6, inner washer 7. Spring 8 and adjusting part 9. This structure is that at the front end of the handle 1, the rotary rod 2 passes through the outer ratchet 3, the inner ratchet 5, the spring 8 and is threaded to the adjustment part 9, and the back cover 4 is threaded to the handle 1; where on the step of the outer ratchet 1 Set two outer washers 6, the end face ratchet 303 of the outer ratchet 3 meshes with the end face ratchet 501 of the inner ratchet 5, and place an inner washer 7 on the bottom of the inner circular groove 504 of the inner ratchet 5 and the inner circular groove of the adjustment part 9 , the spring 8 is placed between the two inner washers, so that the outer ratchet 3 and the inner ratchet 5 are tightened by the elastic force applied by the spring 8; the outer ratchet 3 and the inner ratchet 5 transmit torque through the engagement of the ratchet 303 and the ratchet 501 respectively; The tooth shapes of the outer ratchet 3 , the inner ratchet 5 , the ratchet 303 and the ratchet 501 are shown in FIGS. 4 , 5 , 6 and 7 . In Fig. 7, the ratchet meshing surface 5011 is a helical surface, the outer rising angle α ₁ is the smallest, and the inner rising angle α ₂ is the largest. The condition that the ratchet pair can slide relative to each other is ctgα>μ (μ is the coefficient of friction), too large rising angle 5014 will lock the two ratchets, and make the ratchets sharper, making the relative movement between the ratchets easier Damage deformation, resulting in instability of moment value. A smaller ascending angle affects the height or quantity of the ratchet teeth. Considering various factors, the ascending angle _α2 inside the ratchet helical surface is more suitable to be 40°. A small rounded corner 5012 is added to the ratchet end 5013. When the inner and outer ratchets relatively move to the top of the tooth, they can pass through the small rounded corner smoothly without greater friction and wear, ensuring the accuracy of the screwdriver.

The specific assembly is that the rotating rod 2 passes through the outer ratchet 3 from left to right, and the square structure in the middle of the rotating rod 2 cooperates with the square structure in the inner hole of the outer ratchet 3 to transmit torque. The ratchet part of the outer ratchet 3 penetrates the handle 1 from left to right, and two outer washers 6 are added between the two. The flange end face 302 of the outer ratchet 3 is in contact with the end face of the outer washer 6, and the end face of the outer washer 6 is in contact with the end face of the outer washer 6. The left end surface of the step of the handle 1 is in contact (as shown in Figure 2 and Figure 4). The function of the outer gasket 6 is to reduce friction. The use of PTFE material with a small friction coefficient can greatly reduce the impact of friction resistance on the output torque of the screwdriver. Influence.

As shown in Figure 2, Figure 5, and Figure 6, the inner ratchet 5 penetrates the handle 1 from right to left, and passes through the inner rotary rod 2, the end surface 503 contacts the right end surface of the step of the handle 1, and the groove structure 502 on the side Cooperate with the ribs 102 inside the handle 1 (as shown in FIG. 8 ), and transmit torque through side contact.

As shown in Figure 2, the spring 8 and the inner washer 7 placed on both ends penetrate the handle 10 from right to left and pass through the inner rotary rod 2, and the two ends of the inner washer 7 contact the inner end of the inner ratchet 5 respectively. 504 (as shown in Figure 6), the inner circular groove of the spring 8 and the adjusting part 9, the adjusting part 9 is screwed into a certain displacement by the bottom hole 903 of the inner circular groove through the bottom hole 903 of the rotating rod 2 from right to left, so that the spring 8 has a certain compression deformation, so that the pressure of the spring maintains a fixed value, so as to achieve the purpose of providing load to the inner ratchet 5 by the spring 8 . Wherein, the inner washer 7 placed in the inner circular groove of the adjusting part 9 can adopt a ball bearing (as shown in FIG. 10 , the inner washer of the adjusting part is a sectional view of a medical constant torque screwdriver with a ball bearing). The bottom hole 903 is not threaded, and the thread of the screw rod 2 is self-tapping into the bottom hole 903 (as shown in Figure 9 ) to ensure a tight fit and prevent the torque value from changing due to the looseness of the two parts. In order to reduce the influence of friction, the two ends of the spring 8 need to be very smooth, and the surface of the inner washer 7 needs to be smooth and smooth, with higher hardness, which can be hardened and polished with martensitic stainless steel.

As shown in Figure 11, another assembly structure of the fixed torque screwdriver is shown. This assembly structure is that the assembly sequence of the components is the same as that of the previous one; the screw rod is divided into two sections, one section is the screwdriver head 12, and the other section is connected by bolts. Rod 13, the front section of screwdriver head 12 is an inner hexagonal screwdriver, and its rear section is triangular or square, and is fastened with the triangular or square groove of the front section of the outer ratchet 3; the rear section of the outer ratchet 3 has threaded holes, and The threaded connection of the connecting rod 13, the bolt connecting rod connects the outer ratchet 3, the inner ratchet 5, the spring 8 and the bowl-shaped collar 14 into one; the back cover 4 is threaded with the handle 1; wherein two Outer washer 6, the ratchet 302 of outer ratchet 3 meshes with the ratchet 501 of inner ratchet 5, an inner washer 7 is respectively placed on the bottom of the inner circular groove of inner ratchet 5 and bowl-shaped collar 14, and spring 8 is placed on the two Between the two inner washers, the outer ratchet 3 and the inner ratchet 5 are tightly pressed by the elastic force applied by the spring.

Claims (6)

1. medical miniature determines a torque screwdriver, it is characterized in that, described medical miniature is determined torque screwdriver and formed primarily of handle, swing arm, outer ratchet, bonnet, handle ratchet wheel, outer washer, inner washer, spring and adjustment member; Comprise two kinds of structures; Wherein structure is in a handle front end, swing arm successively through outer ratchet, handle ratchet wheel, after spring and adjustment member be threaded, bonnet is connected with handle threads; Cover two outer washers on the step of wherein ratchet outside, the end face of outer ratchet and the end face ratchet engagement of handle ratchet wheel, on the inner circle bottom land of handle ratchet wheel and adjustment member, respectively place an inner washer, spring is placed between these two inner washers, and the elastic force that outer ratchet and handle ratchet wheel are applied by spring holds out against.

2. a kind of medical miniature determines torque screwdriver according to claim 1, it is characterized in that, the square structure of described swing arm middle part coordinates with the square structure of outer ratchet endoporus.

3. a kind of medical miniature determines torque screwdriver according to claim 1, it is characterized in that, the position, front end of described swing arm is word screwdriver or a cross screwdriver, and its back segment position is one section of screw thread.

4. a kind of medical miniature determines torque screwdriver according to claim 1, it is characterized in that, described handle ratchet wheel periphery and handle inwall are double bond slot fit.

5. a kind of medical miniature determines torque screwdriver according to claim 1, it is characterized in that, the inner washer that the inner circle bottom land of described adjustment member is placed or employing ball bearing replace.

6. a kind of medical miniature determines torque screwdriver according to claim 1, it is characterized in that, another kind of structure is: wherein swing arm is divided into two sections, and one section is driver bit section, and another section is bolt connecting rod; The leading portion of described driver bit section is word screwdriver or a cross screwdriver, and its back segment is Rhizoma Sparganii or square, and with the Rhizoma Sparganii of outer ratchet leading portion or square groove fastening; The back segment of outer ratchet has screwed hole, and with being threaded of bolt connecting rod, outer ratchet, handle ratchet wheel, spring and the bowl-type collar link into an integrated entity by bolt connecting rod; Bonnet is connected with handle threads; Cover two outer washers on the step of wherein ratchet outside, the end face of outer ratchet and the end face ratchet engagement of handle ratchet wheel, on the inner circle bottom land of handle ratchet wheel and the bowl-type collar, respectively place an inner washer, spring is placed between these two inner washers, and the elastic force that outer ratchet and handle ratchet wheel are applied by spring holds out against.