Hemostatic balloon catheter system

Abstract

The invention relates to a hemostasis balloon catheter system which comprises a first pipe fitting, a second pipe fitting, a balloon and a supporting piece, and a pipe cavity is formed between the first pipe fitting and the second pipe fitting; the bag body is eccentrically arranged at the far end part of the second pipe fitting, a channel with two open ends is formed between the bag body and the far end part, the bag body is provided with a bag cavity communicated with the pipe cavity, and the upper surface of the bag body is provided with a plurality of medicine injection paths; the supporting piece is arranged in the channel and has a supporting state of arching outwards and an initial state of resetting inwards, and when the supporting piece is in the supporting state, the supporting piece drives the bag body to arching outwards; one end of the supporting piece is movably arranged on the second pipe fitting and controllably slides relative to the second pipe fitting so that the supporting piece can be switched between the initial state and the supporting state. According to the system, the supporting piece drives the bag body to arch outwards, the bag body can make contact with the damaged position of the blood vessel, accurate permeation of medicine can be achieved, meanwhile, normal circulation of blood in the hemostasis process can be guaranteed, and the risk of postoperative complications is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices, and in particular relates to a hemostatic balloon catheter system. Background Art

[0002] Existing vascular interventional treatment devices, such as balloon dilatation catheters and stents, usually achieve the purpose of treatment by directly dilating blood vessels. However, during vascular damage or postoperative hemostasis, the hemostatic function of traditional catheters is relatively limited, especially when drug release and pressure cannot be controlled, which can easily cause incomplete hemostasis or secondary damage. In addition, during the hemostasis process, existing catheters may affect blood flow, leading to blood clot formation and increasing the risk of postoperative complications. Therefore, it is of great clinical significance to develop a catheter that can accurately control pressure and drug release during hemostasis and ensure normal blood flow. Summary of the invention

[0003] The purpose of the present invention is to provide a hemostatic balloon catheter system, which can accurately control pressure and drug release during hemostasis and ensure normal blood flow.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] A hemostatic balloon catheter system, comprising:

[0006] The first pipe fitting;

[0007] A second pipe fitting, which is sleeved on the outside of the first pipe fitting and forms a closed tube cavity at the far end between the second pipe fitting and the first pipe fitting;

[0008] A sac body, the sac body is eccentrically arranged at the distal end of the second tube member and forms a channel with open ends at both ends between the sac body and the distal end of the second tube member, the sac body has a sac cavity connected to the tube cavity and a plurality of injection paths connecting the sac cavity with the outside are arranged on its upper surface;

[0009] A support member is arranged in the channel and has a supporting state of arching outward and an initial state of resetting inward. When the support member is in the supporting state, the support member drives the sac to arch outward and allows blood to pass through the channel. One end of the support member is movably arranged on the second tube member and controllably slides relative to the second tube member so that the support member can switch between the initial state and the supporting state.

[0010] Preferably, the capsule body includes an inner capsule wall and an outer capsule wall connected to the second tube at both ends, the outer capsule wall is located outside the inner capsule wall and the capsule cavity is formed between the outer capsule wall and the inner capsule wall, and a through groove for connecting the capsule cavity and the tube cavity is opened on the second tube between the inner capsule wall and the outer capsule wall.

[0011] Preferably, the outer capsule wall has a permeable area located at the upper side and non-permeable areas located at both sides of the permeable area, and the drug injection path is arranged on the permeable area.

[0012] Preferably, the permeable region comprises a first permeable layer and a second permeable layer arranged in sequence from the inside to the outside, the first permeable layer is a gel membrane layer formed by cross-linking a polymer and having pores, and the second permeable layer is a polymer membrane layer with a plurality of micropores formed thereon.

[0013] Further preferably, the micropore diameter of the second permeable layer is larger than the pore diameter of the first permeable layer.

[0014] Preferably, the impermeable region is an impermeable polymer film layer.

[0015] Preferably, the outer capsule wall is an impermeable polymer film layer.

[0016] In some embodiments, the gel film layer is polyvinyl alcohol.

[0017] In some embodiments, the polymer film layer is polyurethane.

[0018] Preferably, the capsule has an arc-shaped cross-section in the vertical direction.

[0019] Preferably, the support member has a mesh structure.

[0020] Preferably, the support member is made of metal or a metal alloy.

[0021] In some embodiments, the support member is made of nickel-titanium alloy.

[0022] Preferably, the proximal end and the distal end of the support member extend out of the capsule respectively, the distal end of the support member is fixed, and the proximal end is movable.

[0023] Preferably, the support member has a larger width in the middle and smaller widths at both ends.

[0024] Preferably, the hemostatic balloon catheter system also includes a driving mechanism configured to drive the support member to move, the driving mechanism includes a shell connected to the proximal end of the second tube, a transmission member movably arranged between the shell and the second tube and distally connected to one end of the support member, and a driving component arranged on the shell and configured to control the movement of the transmission member, and the transmission member is controlled by the driving component and can drive the support member to slide relative to the second tube.

[0025] In some embodiments, the transmission member includes a third tube member and a fourth tube member which are sleeved on the outside of the second tube member, the third tube member is connected to the support member, the fourth tube member is located at the proximal end of the third tube member and is spirally connected to the outer shell, and is controlled by the drive assembly. The fourth tube member can rotate around the axis and slide along its axial direction with the third tube member.

[0026] In some embodiments, the drive assembly includes a driving wheel threadedly connected to a transmission member, a rod member connected to the driving wheel at one end, an operating portion rotatably disposed on the housing, and a transmission wheel group disposed between the operating portion and the rod member. The operating portion is rotated, and the operating portion drives the transmission wheel group to rotate with the rod member, thereby driving the driving wheel to move with the transmission member.

[0027] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0028] The hemostatic sac catheter system of the present invention drives the sac to arch outward through the support member, so that the sac can contact the damaged part of the blood vessel. The contact pressure between the sac and the damaged part of the blood vessel can be adjusted by further controlling the degree of outward arching of the support member. By injecting drugs into the lumen, the drugs can flow into the sac cavity and flow out to the damaged part of the blood vessel through the injection path, thereby achieving precise penetration of the drugs. At the same time, the hemostatic sac catheter system can ensure the normal circulation of blood during the hemostasis process, achieve rapid and effective hemostasis without affecting blood flow, and reduce the risk of postoperative complications. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 This is a schematic structural diagram of the hemostatic balloon catheter system of Example 1;

[0031] Figure 2 This is a schematic structural diagram of the distal end portion of the hemostatic balloon catheter system of Example 1;

[0032] Figure 3 This is a structural exploded view of the distal end of the hemostatic balloon catheter system of Example 1;

[0033] Figure 4 It is a cross-sectional view of the distal end portion of the hemostatic balloon catheter system of Example 1;

[0034] Figure 5 This is a schematic diagram of the structure of the capsule of Example 1;

[0035] Figure 6 is a top view of the capsule of Example 1;

[0036] Figure 7 for Figure 6 Sectional view of the AA plane;

[0037] Figure 8 This is a schematic structural diagram of the capsule of Example 1 from another angle;

[0038] Fig. 9 for Figure 8 Sectional view of the middle BB plane;

[0039] Fig.10 This is a structural exploded view of the capsule of Example 1;

[0040] Fig.11 This is a schematic structural diagram of the support member of Example 1;

[0041] Fig.12 is a top view of the support member of Example 1;

[0042] Fig.13 This is a schematic structural diagram of the support member of Example 1 from another angle;

[0043] Fig.14 This is a schematic structural diagram of the proximal portion of the hemostatic balloon catheter system of Example 1;

[0044] Fig.15 It is a cross-sectional view of the proximal portion of the hemostatic balloon catheter system of Example 1;

[0045] Fig.16 This is a physical picture of the distal end of the hemostatic balloon catheter system of Example 1;

[0046] Wherein: 1, catheter; 11, first pipe; 12, second pipe; 121, through groove; 13, lumen; 14, fixed end;

[0047] 2. capsule body; 21. inner capsule wall; 22. outer capsule wall; 221. permeable region; 2211. first permeable layer; 2212. second permeable layer; 2213. micropores; 222. non-permeable region; 23. capsule cavity;

[0048] 3. Channel;

[0049] 4. Support member; 41. Support body; 42. Distal support ring; 43. Proximal support ring;

[0050] 5. Driving mechanism; 51. Housing; 511. Drug injection cavity; 512. Guide wire cavity; 52. Third pipe; 53. Fourth pipe; 54. Driving wheel; 55. Rod; 56. First gear; 57. Second gear; 58. Operating unit. DETAILED DESCRIPTION

[0051] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the embodiments of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0052] In the description of the embodiments of the present invention, it should be understood that the terms "distal", "proximal", etc. indicate positions or positional relationships defined by the position of the hemostatic balloon catheter system when in use, wherein the side close to the operator is the proximal end, and the side away from the operator is the distal end. This is only for the convenience of describing the embodiments of the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the embodiments of the present invention.

[0053] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0054] In the embodiments of the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0055] The disclosure below provides many different embodiments or examples to implement different structures of the embodiments of the present invention. In order to simplify the disclosure of the embodiments of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the embodiments of the present invention. In addition, the embodiments of the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed.

[0056] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0057] Example 1

[0058] A hemostatic balloon catheter system, such as Figures 1 to 16 As shown, it includes a catheter 1, a balloon 2 and a support 4.

[0059] The catheter 1 includes a first elongated tube 11 and a second tube 12. The second tube 12 is sleeved on the outside of the first tube 11 and is preferably coaxial with the first tube 11, and a lumen 13 is formed between the second tube 12 and the first tube 11. The distal end of the lumen 13 is closed, and the proximal end has a drug injection port, through which a hemostatic drug can be injected into the lumen 13. Drugs such as tranexamic acid (TXA) can inhibit fibrinolysis and help stabilize blood clots at the site of vascular injury.

[0060] See also Figures 1 to 3 The capsule 2 is eccentrically arranged at the distal end of the second tube 12 and forms a channel 3 with the distal end of the second tube 12. The distal and proximal ends of the channel 3 are open, thereby allowing blood to pass through without affecting the normal flow of blood. Preferably, the cross-section of the capsule 2 in the vertical direction is arc-shaped and its two ends are respectively connected to the two sides of the distal end of the second tube 12, and the capsule 2 has a certain length in the horizontal direction. The capsule 2 has a capsule cavity 23 connected to the lumen 13. The upper surface of the capsule 2 is provided with a plurality of injection paths that connect the capsule cavity 23 with the outside world, and the lower surface is not provided with a drug injection path, so that the drug only flows out from the upper surface and acts on the damaged part of the blood vessel in contact with it, without leaking from the lower surface, and the drug administration is more accurate.

[0061] Specifically, see Figures 4 to 10 The capsule body 2 includes an inner capsule wall 21, an outer capsule wall 22, and a capsule cavity 23 formed between the inner capsule wall 21 and the outer capsule wall 22. In order to achieve the connection between the capsule cavity 23 and the lumen 13, a through groove 121 connecting the inner capsule wall 21 and the outer capsule wall 22 can be opened on the second tube member 12 between the inner capsule wall 21 and the outer capsule wall 22. The outer capsule wall 22 is located outside the inner capsule wall 21 and has a drug injection path thereon, and the inner capsule wall 21 is not provided with a drug injection path to prevent drug leakage. The drug injection path can be composed of micropores 2213 opened on the outer capsule wall 22 and / or pores formed on the outer capsule wall 22. As a preferred example, a large number of micropores 2213 can be formed by punching holes in a polymer film; by controlling the degree of cross-linking of the polymer, a film with pores can be formed, and the drug can seep out through the pores.

[0062] In this embodiment, the outer capsule wall 22 includes a permeable region 221 located on the upper side and non-permeable regions 222 located on both sides of the permeable region 221, and the drug injection path is arranged on the permeable region 221. Specifically, the permeable region 221 includes a first permeable layer 2211 and a second permeable layer 2212 arranged in sequence from the inside to the outside, the first permeable layer 2211 is a gel film layer formed by polymer cross-linking and having pores, preferably a polyvinyl alcohol (PVA) hydrogel film; the second permeable layer 2212 is a polymer film layer and has a plurality of micropores 2213 thereon, preferably a polyurethane (PU) film layer, the pore size of the micropores 2213 of the second permeable layer 2212 is larger than the pore size of the first permeable layer 2211, ensuring that the drug can be driven to penetrate in the permeable region 221 by the concentration gradient. The preparation of the outer capsule wall 22 includes forming a thin and flexible capsule wall structure by a blow molding process, after a large number of micropores 2213 are punched on the capsule wall where the permeable region 221 is located, a PVA hydrogel film is coated on the inner side to form the outer capsule wall 22. The inner capsule wall 21 is preferably an impermeable polymer film, such as a PU film layer.

[0063] Since the capsule 2 is flexible, has a small supporting force and is difficult to fit with the blood vessel wall, it is difficult to accurately deliver the drug from the capsule 2 to the damaged blood vessel. The inventors set a support member 4 between the capsule 2 and the second tube 12, and support the capsule 2 through the support member 4, so that the capsule 2 can fit the damaged blood vessel and achieve accurate drug delivery of the capsule 2. Specifically, the support member 4 is arranged in the channel 3 and has a supporting state of arching outward and an initial state of resetting inward. When the support member 4 is in the supporting state, the support member 4 drives the capsule 2 to arch outward and allows blood to pass through the channel 3. One end of the support member 4 is movably arranged on the second tube 12 and can slide controllably relative to the second tube 12 so that the support member 4 can switch between the initial state and the supporting state.

[0064] Further, see Figures 11 to 13The support member 4 includes a support body 41 and a distal support ring 42 and a proximal support ring 43 located on both sides of the support body 41. The support body 41 is a mesh structure. The support body 41 with a mesh structure allows blood to pass through during the hemostasis process and can filter blood clots caused by blood vessel damage to prevent blood flow obstruction. Preferably, the support body 41 has a large width in the middle and a small width at both ends. The two ends extend out of the capsule 2 and are respectively connected to the distal support ring 42 and the proximal support ring 43. The distal support ring 42 and the proximal support ring 43 are movably sleeved on the outside of the second pipe 12. When one of them approaches the other, the support body 41 arches upward and drives the capsule 2 to arch upward. By adjusting the arch height, the contact area and contact pressure between the capsule 2 and the blood vessel wall can be adjusted. The support body 41 is made of metal or metal alloy, preferably nickel-titanium alloy. Nickel-titanium alloy has strength, toughness and developability, and is suitable for supporting the capsule 2 when shape memory function is not required. The material of the distal support ring 42 and the proximal support ring 43 is the same as that of the support body 41 or can also be a conventional material in the art, and this application does not limit it.

[0065] The hemostatic balloon catheter system further comprises a driving mechanism 5 configured to drive the support member 4 to move. Fig.14 and Fig.15 As shown, the driving mechanism 5 includes a housing 51, a transmission member and a driving assembly. The housing 51 is connected to the proximal end of the second pipe 12, and is provided with a drug injection cavity 511 connected to the lumen 13 and a guide wire cavity 512 connected to the first pipe 11. The transmission member is movably arranged between the housing 51 and the second pipe 12, with its proximal end connected to the housing 51 and its distal end connected to the proximal support ring 43 of the support member 4. Controlled by the driving assembly, the transmission member can slide with the proximal support ring 43 relative to the second pipe 12, and at this time, the distal support ring 42 abuts against the fixed end 14 connected to the distal end of the second pipe 12, and the support body 41 has a tendency to arch outward.

[0066] Further, the transmission member includes a third tube member 52 and a fourth tube member 53 sleeved on the outside of the second tube member 12, the third tube member 52 is connected to the proximal support ring 43 of the support member 4, the fourth tube member 53 is located at the proximal end of the third tube member 52 and is spirally connected to the housing 51, and is controlled by the driving assembly. The fourth tube member 53 can rotate around the axis and slide along the axial direction of the third tube member 52. The driving assembly includes a driving wheel 54 threadedly connected to the fourth tube member 53, a rod member 55 connected to the driving wheel 54 at one end, an operating portion 58 rotatably disposed on the housing 51, and a transmission wheel group disposed between the operating portion 58 and the rod member 55, and the transmission wheel group includes a first gear 56 fixedly connected to the other end of the rod member 55 and a second gear 57 meshed between the operating portion 58 and the first gear 56, and the second gear 57 has a plurality of gears disposed around the outer periphery of the first gear 56. The operating part 58 is rotated, and the operating part 58 drives the second gear 57 to rotate with the first gear 56. The first gear 56 rotates and drives the rod 55 and the driving wheel 54 to rotate. The driving wheel 54 rotates to drive the fourth rod 55 to rotate and drives the third rod 55 to slide along the axial direction of the fourth rod 55, thereby switching the support member 4 from the initial state to the supporting state or from the supporting state to the initial state.

[0067] Working principle:

[0068] The distal end of the hemostatic balloon catheter system is placed at the target position, and then the operating part 58 is rotated. The operating part 58 drives the second gear 57 to rotate with the first gear 56, the rod 55 and the driving wheel 54. When the driving wheel 54 rotates, it drives the fourth tube 53 to rotate and slides the third tube 52 toward the distal end, thereby driving the proximal end of the support member 4 (i.e., the proximal support ring 43) to slide toward the distal end. The support body 41 has a tendency to arch outward and switches from the initial state to the supporting state. The support member 4 drives the balloon 2 to arch outward and align with the damaged blood vessel at the target position. The sliding distance of the proximal end of the support member 4 can be controlled by rotating the operating portion 58, so that the contact area and contact pressure between the capsule 2 and the damaged blood vessel can be adjusted. After the adjustment is completed, the drug is introduced into the lumen 13 through the injection cavity 511, and the drug flows into the capsule cavity 23 through the lumen 13, and enters the damaged blood vessel through the injection path of the penetration area 221, thereby playing a role in hemostasis and drug treatment. At the same time, the mesh main structure of the support member 4 allows blood to filter blood clots caused by blood vessel damage during the hemostasis process to prevent blood flow blockage.

[0069] After hemostasis is completed, the operating part 58 is rotated in the reverse direction to switch the supporting member 4 from the supporting state to the initial state of inward reset, and the catheter 1 can be withdrawn.

[0070] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A hemostatic balloon catheter system, characterized in that: The hemostatic balloon catheter system comprises: A first pipe member (11); A second tube member (12), the second tube member (12) being sleeved on the outside of the first tube member (11) and forming a tube cavity (13) with a closed distal end between the second tube member (12) and the first tube member (11); A sac (2), the sac (2) being eccentrically arranged at the distal end of the second tube (12) and forming a channel (3) with both distal and proximal ends open between the sac and the distal end of the second tube (12), the sac (2) having a sac cavity (23) connected to the tube cavity (13) and having a plurality of injection paths on its upper surface for connecting the sac cavity (23) with the outside; A support member (4) is arranged in the channel (3) and has a supporting state of arching outward and an initial state of returning inward. When the support member (4) is in the supporting state, the support member (4) drives the bag body (2) to arch outward and allows blood to pass through the channel (3). One end of the support member (4) is movably arranged on the second tube member (12) and can be controllably slid relative to the second tube member (12) so that the support member (4) can switch between the initial state and the supporting state.

2. The hemostatic balloon catheter system according to claim 1, characterized in that: The capsule body (2) comprises an inner capsule wall (21) and an outer capsule wall (22) whose two ends are connected to the second tube member (12); the outer capsule wall (22) is located on the outside of the inner capsule wall (21) and forms the capsule cavity (23) between the outer capsule wall (22) and the inner capsule wall (21); and a through groove (121) for connecting the capsule cavity (23) with the tube cavity (13) is provided on the second tube member (12) between the inner capsule wall (21) and the outer capsule wall (22).

3. The hemostatic balloon catheter system according to claim 2, characterized in that: The outer capsule wall (22) has a permeable area (221) located on the upper side and non-permeable areas (222) located on both sides of the permeable area (221), and the drug injection path is arranged on the permeable area (221).

4. The hemostatic balloon catheter system according to claim 3, characterized in that: The permeable region (221) comprises a first permeable layer (2211) and a second permeable layer (2212) which are arranged in sequence from the inside to the outside, wherein the first permeable layer (2211) is a gel membrane layer formed by cross-linking a polymer and having pores, and the second permeable layer (2212) is a polymer membrane layer and has a plurality of micropores (2213) formed thereon; The impermeable region (222) is an impermeable polymer film layer.

5. The hemostatic balloon catheter system according to claim 2, characterized in that: The outer capsule wall (22) is a non-permeable polymer film layer.

6. The hemostatic balloon catheter system according to claim 1, characterized in that: The capsule (2) has an arc-shaped cross section in the vertical direction.

7. The hemostatic balloon catheter system according to claim 1, characterized in that: The support member (4) has a mesh structure; And / or, the support member (4) is made of metal or metal alloy.

8. The hemostatic balloon catheter system according to claim 1, characterized in that: The proximal end and the distal end of the support member (4) respectively extend out of the capsule (2); the distal end of the support member (4) is fixed, and the proximal end is movable.

9. The hemostatic balloon catheter system according to claim 1, characterized in that: The support member (4) has a large width in the middle and a small width at both ends.

10. The hemostatic balloon catheter system according to claim 1, characterized in that: The hemostatic sac catheter system also includes a driving mechanism (5) configured to drive the support member (4) to move, the driving mechanism (5) including a shell (51) connected to the proximal end of the second tube (12), a transmission member movably arranged between the shell (51) and the second tube (12) and distally connected to one end of the support member (4), and a driving component arranged on the shell (51) and configured to control the movement of the transmission member, and controlled by the driving component, the transmission member can slide with the support member (4) relative to the second tube (12).

11. The hemostatic balloon catheter system according to claim 10, characterized in that: The transmission member comprises a third tube member (52) and a fourth tube member (53) which are sleeved on the outside of the second tube member (12); the third tube member (52) is connected to the support member (4); the fourth tube member (53) is located at the proximal end of the third tube member (52) and is spirally connected to the outer shell (51); and is controlled by the drive assembly. The fourth tube member (53) can rotate around an axis and slide along the axial direction of the third tube member (52).

12. The hemostatic balloon catheter system according to claim 10, characterized in that: The driving assembly comprises a driving wheel (54) threadedly connected to a transmission member, a rod member (55) one end of which is connected to the driving wheel (54), an operating portion (58) rotatably arranged on the housing (51), and a transmission wheel group arranged between the operating portion (58) and the rod member (55); when the operating portion (58) is rotated, the operating portion (58) drives the transmission wheel group to rotate with the rod member (55), thereby driving the driving wheel (54) to move with the transmission member.

Images